CN119548182A

CN119548182A - An easily detachable inner core component and surgical instrument using the same

Info

Publication number: CN119548182A
Application number: CN202411443156.7A
Authority: CN
Inventors: 朱莫恕; 李银
Original assignee: Blue Green Star Life Sciences Shenzhen Co ltd
Current assignee: Blue Green Star Life Sciences Shenzhen Co ltd
Priority date: 2024-10-16
Filing date: 2024-10-16
Publication date: 2025-03-04

Abstract

An easily detachable inner core assembly and a surgical instrument using the same comprise an inner rod assembly and an outer tube assembly, wherein the outer tube assembly comprises a base and a hollow outer tube. The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a main pin, a retainer ring and a driving rod. The first jaw comprises a first tail and the second jaw comprises a second tail. The main pin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are mutually stacked, and the retainer ring and the main pin or the second jaw tail are fixed together, so that the first jaw tail and the second jaw tail are fixed between the pin flange and the retainer ring to form a first rotating pair capable of rotating around the main pin. The first jaw tail and the first connecting rod are matched to form a second revolute pair, and the second jaw tail and the second connecting rod are matched to form a third revolute pair. The first connecting rod and the driving rod are matched to form a fourth revolute pair, and the second connecting rod and the driving rod are matched to form a fifth revolute pair. The inner rod assembly is installed in the outer tube assembly, and the main pin shaft is matched with the base to form a quick detachable structure.

Description

Easily detachable inner core assembly and surgical instrument using same

Technical Field

The invention relates to a minimally invasive surgical instrument, in particular to an easily detachable inner core assembly and a surgical instrument using the same.

Background

The endoscope minimally invasive surgery adopts an elongated endoscope handheld instrument, enters the body of a patient through a natural cavity channel or a constructed puncture channel, and completes the operations of tissue grabbing, shearing, separating, coagulation, suture closing and the like. The main advantages over traditional open surgery are reduced trauma and pain and accelerated recovery. To date, reusable endoscopic hand-held instruments (abbreviated as reusable instruments) have been dominant in the market, and disposable endoscopic hand-held instruments (abbreviated as disposable instruments) have relatively few clinical applications. Studies have shown that there are unreliable and uncontrollable problems with cleaning, dispensing and use of multiplex instruments, and no reliable solutions have been presented to date.

Disclosure of Invention

Therefore, in order to solve the problems in the prior art, an instrument which can be conveniently disassembled and washed is provided.

In one aspect of the invention, a readily removable core assembly is provided comprising an inner rod assembly and an outer tube assembly comprising a base and a hollow outer tube. The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a main pin, a retainer ring and a driving rod. The proximal end of the first jaw includes a first tail and a first base aperture extending transversely therethrough, and the proximal end of the second jaw includes a second tail and a second base aperture extending transversely therethrough. The main pin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are mutually stacked, the main pin penetrates through the first base hole and the second base hole, and the retainer ring and the main pin or the second jaw tail are fixed together, so that the first jaw tail and the second jaw tail are fixed between the pin flange and the retainer ring to form a first rotating pair capable of rotating around the main pin. The first jaw tail and the first connecting rod are matched to form a second revolute pair, the second jaw tail and the second connecting rod are matched to form a third revolute pair, the first connecting rod and the driving rod are matched to form a fourth revolute pair, and the second connecting rod and the driving rod are matched to form a fifth revolute pair. And the first, second, third, fourth and fifth revolute pairs can rotate simultaneously by moving the driving rod. The inner rod assembly is installed in the outer tube assembly, and the main pin shaft is matched with the base to form a quick detachable structure.

In one aspect, the kingpin includes a first pin head, a second pin head and a pin flange disposed therebetween, the second pin head including a pin ring groove, and the retaining ring including a retaining ring bore defined by an annular segment and sized to match the pin ring groove. The first jaw tail and the second jaw tail are mutually stacked, the second pin head penetrates through the first base hole and the second base hole, the retainer ring is fixed in the pin ring groove, and the first jaw tail and the second jaw tail are fixed together to form a first rotating pair capable of rotating around the main pin.

In yet another aspect, the retainer ring further comprises a retainer ring opening, and the annular piece of the retainer ring is welded to the first tail or the second tail.

In yet another aspect, the first link includes a first link head and a first link tail and a first link body extending therebetween, the first link head including a first link shaft extending laterally outward, the first link tail including a first link aperture extending laterally therethrough. The second link includes a second link head having a second link shaft extending laterally outward and a second link tail having a second link aperture extending laterally therethrough and a second link body extending therebetween. The proximal end of the first jaw tail comprises a first tail hole, the first tail hole and the first connecting rod shaft are fixed together to form a second revolute pair, the proximal end of the second jaw tail comprises a second tail hole, and the second tail hole and the second connecting rod shaft are fixed together to form a third revolute pair.

In yet another aspect, the first shaft end face includes a first blind hole defined by a first shaft wall, and the first shaft wall is deformed outward to form a first bead after the first shaft penetrates the first tail hole, the first bead limiting separation of the second revolute pair. The end face of the second connecting rod shaft comprises a second blind hole defined by a second shaft wall, and after the second connecting rod shaft penetrates through the second tail hole, the second shaft wall is outwards turned and deformed to form a second curled edge, and the second curled edge limits the third revolute pair to be separated.

In yet another aspect, the drive rod includes a drive head including first and second outwardly extending drive shafts, the first drive shaft end face including a third shaft wall and the second drive shaft end face including a fourth shaft wall. The first driving shaft penetrates through the first connecting rod hole and then the third shaft wall is outwards turned and deformed to form a third curled edge to limit the separation of the fourth revolute pair, and the second driving shaft penetrates through the second connecting rod hole and then the fourth shaft wall is outwards turned and deformed to form a fourth curled edge to limit the separation of the fifth revolute pair.

In yet another aspect, the base includes first and second longitudinal datum planes that are perpendicular to each other and a principal axis of intersection, the base further includes a base tail and first and second main arms that extend to a distal end, the first and second main arms being disposed on opposite sides of the first longitudinal datum plane, the two defining a U-shaped slot. The base also comprises a first special-shaped groove and a second special-shaped groove, wherein the first special-shaped groove extends from the distal end of the first main arm to the proximal end along the second longitudinal reference plane and divides the first special-shaped groove into a first elastic arm and a second elastic arm, and the second special-shaped groove extends from the distal end of the second main arm to the proximal end along the second longitudinal reference plane and divides the second special-shaped groove into a third elastic arm and a fourth elastic arm. One end pin head of the main pin is clamped in a first special-shaped groove between the first elastic arm and the second elastic arm to form a first occlusion pair, and the other end pin head of the main pin is clamped in a second special-shaped groove between the second elastic arm and the third elastic arm to form a second occlusion pair. The driving rod is moved from the far end to the near end, so that one end pin head of the main pin can slide into the first special-shaped groove to form a first occlusion pair, and the other end pin head of the main pin can slide into the second special-shaped groove to form a second occlusion pair. The driving rod is moved from the proximal end to the distal end, so that the pin head at one end of the main pin slides out of the first special-shaped groove to separate the first occluding pair, and the pin head at the other end of the main pin slides out of the second special-shaped groove to separate the second occluding pair.

In yet another scheme, the first special-shaped groove comprises a first guiding opening at the far end, a first cylindrical surface and a first cutting groove, the maximum opening width of the first guiding opening is H11, the diameter of the first cylindrical surface is D11, and the first guiding opening and the first cylindrical surface are intersected to form a first seaming opening with the opening width of H12, wherein H11 is larger than or equal to D11> H12. The second special-shaped groove comprises a second guide opening at the far end, a second column surface and a second cutting groove, the maximum opening width of the second guide opening is H21, the diameter of the second column surface is D21, and the second guide opening and the second column surface are intersected to form a second seaming opening with the opening width of H22, wherein H21 is more than or equal to D21> H22. The pin head at one end of the main pin is embedded into the first cylindrical surface to form a first occluding pair, and the pin head at the other end of the main pin is embedded into the second cylindrical surface to form a second occluding pair.

In yet another aspect, the core assembly includes three states of an operational state, a critical state and a separation state, and the driving head corresponding thereto includes an operational displacement Lw1, a critical displacement Le1, wherein Lw1> Le1. When the driving head is in working displacement Lw1, the pin head of the main pin is kept in contact with the first second column surface, namely the first and second occluding pairs are in an occluding state, and the first and second jaw heads can be closed or opened within the angle range of 0-A1 by moving the driving rod. When the driving head is in critical displacement Le1, the driving rod is continuously moved from the proximal end to the distal end, at the moment, the opening angle of the first jaw and the second jaw reaches the maximum limit angle A1, and Le1 is not reduced any more, so that the driving head pushes the first jaw and the second jaw tail to move towards the distal end, and further pushes the pin head of the main pin to move towards the distal end and push the first seaming and the second seaming to open. And in the separation state, when the driving rod is continuously moved from the proximal end to the distal end in the critical state, the pin head of the main pin is pushed to move towards the distal end, the first and second biting openings are fully expanded and slipped into the first and second guiding openings, namely, the first and second biting pairs are in a failure separation state, so that the separation of the inner rod assembly and the outer tube assembly is realized.

In another aspect of the invention, a surgical instrument for minimally invasive surgery, the instrument comprising a core assembly according to any one of claims 1-9, further comprising a handle assembly mated thereto, the handle assembly comprising a wheel assembly, a button assembly, a handle shaft and first and second handles rotatable about the handle assembly, the outer tube assembly of the core assembly mated to the wheel assembly and the button assembly, the drive rod comprising a drive head, a drive tail and a drive rod extending therebetween, the drive tail being connected to the second handle, the first and second handles being rotatable about the handle shaft to move the drive tail to thereby drive the drive head to thereby drive the first, second, third, fourth, and fifth pairs of rotations to thereby drive the first and second jaws to rotate about the first pairs of rotations to open or close.

Drawings

For a fuller understanding of the nature of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a 3D schematic view of an instrument 1;

fig. 2 is a 3D schematic of the core assembly 3;

fig. 3 is an exploded schematic view of the core assembly 3;

Fig. 4 is a cross-sectional view of the outer tube assembly 5 along its axis;

Fig. 5 is a schematic view of the base 51 in its second longitudinal reference plane 502;

fig. 6 is a schematic view of the base 51 in its first longitudinal reference plane 501;

Fig. 7 is a 3D schematic view of the base 51;

Fig. 8 is an exploded schematic view of the inner rod assembly 4;

FIG. 9 is a schematic side view of the inner rod assembly 4;

FIG. 10 is a cross-sectional view 10-10 of FIG. 9;

FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 9;

figure 12 is a partial projection view of the distal end of the core assembly 3;

FIG. 13 is a sectional view taken along line 13-13 of FIG. 12;

figure 14 is a partial cross-sectional view of the core assembly mated with the handle assembly;

FIG. 15 is a partial projection view of the distal end of yet another improved core;

FIG. 16 is a cross-sectional view taken along line 16-16 of FIG. 15;

throughout the drawings, like reference numerals designate identical parts or elements.

Detailed Description

Embodiments of the present invention are disclosed herein, but it is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, the disclosure herein is not to be interpreted as limiting, but merely as a basis for the claims and as a basis for teaching one skilled in the art how to employ the invention.

Referring to fig. 1, for convenience of description, the side closer to the operator is defined as the proximal side, and the side farther from the operator is defined as the distal side. In performing laparoscopic surgery, a penetrating cannula assembly (not shown) is typically used to create a surgical path for instruments into and out of the patient's body wall, and various minimally invasive instruments, such as instrument 1, may be inserted into a body cavity through the path created by the cannula assembly. One or more cannula assemblies may be used simultaneously during surgery, and instrument 1 may be configured for one or more simultaneous operations, as desired during surgery.

Fig. 1-4 depict a typical endoscopic hand-held instrument 1 comprising a handle assembly 2 and a core assembly 3. The inner core assembly 3 comprises an inner rod assembly 4 and an outer tube assembly 5.

As described in fig. 3-7. The base 51 comprises a first longitudinal reference plane 501 and a second longitudinal reference plane 502 perpendicular to each other and a principal axis of intersection 503. The base 510 further comprises a base tail 505, a first main arm 507 and a second main arm 508 extending to a distal end, wherein the first main arm and the second main arm are arranged at two sides of a first longitudinal datum plane, the first main arm and the second main arm define a U-shaped groove 506, the base shaft hole 504 penetrates through the base tail 505 along the axial direction and penetrates through the U-shaped groove 506, and the hole axis of the base shaft hole is basically coincident with the main axis.

Referring now to fig. 5-7, the base 51 further comprises a first profiled groove 510 and a second profiled groove 520. The first profiled groove 510 extends proximally from the distal end of the first main arm along the second longitudinal reference plane 502 and divides it into a first spring arm 515 and a second spring arm 517. The second profiled groove 520 extends proximally from the distal end of the second main arm along the second longitudinal reference plane 502 and divides it into a third spring arm 525 and a fourth spring arm 527. The first profiled groove 510 comprises a distal first guiding opening 511, a first cylindrical surface 512 and a first cut-out groove 513. The maximum opening width of the first guiding opening is H11, the diameter of the first cylindrical surface 512 is D11, and the first guiding opening 511 and the first cylindrical surface 512 intersect to form a first seaming 516 with the opening width of H12. In a preferred scheme, H11 is more than or equal to D11> H12. The first cutout cuts through the first cylindrical surface 512 and extends proximally toward the first main arm.

Similarly, as shown in fig. 5-7, the second profiled groove 520 comprises a distal second guiding opening 521, a second post 522 and a second cut-out groove 523. The maximum opening width of the second guide opening is H21, the diameter of the second column surface 522 is D21, and the second guide opening 521 and the second column surface 522 intersect to form a second nip 526 having an opening width H22. In a preferred scheme, H21 is more than or equal to D21> H22. The second cutout slot cuts through the second post 522 and extends proximally toward the second main arm. (H21, D21 and H22 are not shown in the figure and can be understood with reference to FIG. 6). The first cylindrical surface 512 includes a first transverse axis 514 and the second cylindrical surface 522 includes a second transverse axis 524, the first and second transverse axes being substantially coincident and perpendicular to the first longitudinal reference plane.

Referring now to fig. 3-4, hollow outer tube 55 includes an outer tube head 550 and an outer tube tail 570 and extends therebetween to an outer tube body 560, with an axial through bore 551 extending therethrough in an axial direction. The outer tube tail also includes an outer tube ring groove 571 and an adapter 575. The base 51 and the hollow outer tube 55 may be fixed together by welding, riveting or bonding processes of a plurality of parts, or may be cut from a single metal base material. The outer tube assembly 5 may also include an insulating tube 59 mounted to a surface thereof.

Fig. 8 depicts an exploded view of the inner rod assembly 4. The inner rod assembly 4 comprises a first jaw 41, a second jaw 42, a first link 43, a second link 44, a kingpin 45, a retainer ring 46 and a drive rod 47.

With continued reference to fig. 8, the proximal end of the first jaw 41 includes a first tail 413 of thickness Hj1 defined by a first outer side 411 and a first inner side 412. The proximal end of the first tail comprises a first tail aperture 414 extending transversely therethrough and the distal end thereof comprises a first base aperture 415 extending transversely therethrough. First jaw wrist 416 is integral with first jaw tail 413 and extends distally to form first jaw head 419. The proximal end of the second jaw 42 includes a second tail 423 having a thickness Hj2 defined by a second outer side 421 and a second inner side 422. The proximal end of the second tail comprises a second tail aperture 424 extending transversely therethrough and the distal end thereof comprises a second base aperture 425 extending transversely therethrough. A second jaw 426 is integral with the second tail 423 and extends distally to form a second jaw 429.

With continued reference to FIG. 8, the first link 43 includes a first link head 431 and a first link tail 433 and extending therebetween to a first link body 432, the first link head 431 includes a first link shaft 435 extending laterally outward, and the first link tail 433 includes a first link hole 437 extending laterally therethrough. The second link 44 includes a second link head 441 and a second link tail 443 and a second link body 442 extending therebetween, the second link head 441 including a second link shaft 445 extending laterally outward, the second link tail 443 including a second link aperture 447 extending laterally therethrough. The kingpin 45 includes a first pin head 451, a second pin head 455, and a pin flange 453 disposed therebetween, the pin flange 453 having a larger diameter than the first pin head (second pin head). The retainer 46 includes a retainer aperture 465 defined by the annular flap 461.

Referring now to fig. 3 and 8, the drive rod 47 includes a drive head 471, a drive tail 479, and a drive rod 477 extending therebetween. The drive head 471 includes a first drive shaft 473 and a second drive shaft 475 that extend laterally outward. The drive tail 479 includes a drive rod annular groove 478.

Fig. 3, 8-11 depict the structural composition and assembly relationship of the inner rod assembly 4 in greater detail. The first tail 413 and the second tail 423 are stacked on each other, the second pin head 455 passes through the first base hole 415 and the second base hole 425, and the retainer ring 46 is fixed to an adjacent area of the end of the second pin head 455, so as to fix the first tail and the second tail together and form a first rotating pair rotatable about the main pin 45. The first link shaft 435 penetrates the first tail hole 414, fixes the first link head 431 and the first jaw tail 413 together, and constitutes a second revolute pair rotatable around the first link shaft 435. The second link shaft 445 penetrates the second tail hole 424, fixing the second link head 441 and the second jaw tail 423 together and constituting a third revolute pair rotatable about the second link shaft 445. The first driving shaft 473 penetrates the first link hole 437, fixes the first link tail 433 and the driving head 471 together and constitutes a fourth revolute pair rotatable about the first driving shaft 473. The second drive shaft 475 penetrates the second link aperture 447, securing the second link tail 443 and the drive head 471 together and forming a fifth revolute pair rotatable about the second drive shaft 475. The first, second, third, fourth and fifth revolute pairs can be simultaneously rotated by pulling the driving rod 47.

Fig. 2, 12-13 depict the assembly relationship of the core assembly 3 in greater detail. The driving rod 47 is installed in the axial through hole 551 of the outer tube assembly, the first jaw tail, the second jaw tail, the first connecting rod and the second connecting rod are installed in the U-shaped groove 506, the first pin head 451 is embedded in the second cylindrical surface 522 to form a first snap pair, and the second pin head 455 is embedded in the first cylindrical surface 512 to form a second snap pair. The first and second occluding pairs support and fix the two ends of the main pin shaft, and when the driving head 471 is moved, the first and second connecting rods are driven to move and rotate to drive the first and second jaw tails to rotate, so that the first and second jaw heads are closed or opened.

It will now be understood in conjunction with fig. 1,2, 4 and 14. The handle assembly 2 comprises a first handle 92 and a second handle 93 connected by a handle shaft 91, the first and second handles being rotatable about the handle shaft. The rotor assembly 95 comprises a rotor 951, an outer sleeve 953 and an inner sleeve 955, the outer sleeve 953 being integral with the rotor 951, the inner sleeve 955 being integral with the first handle 92, the outer sleeve 953 and the inner sleeve 955 forming a rotation mechanism such that the rotor 951 is rotatable relative to the first handle. The button assembly 97 is mounted in the button mounting bin 98 of the first handle 92. Button assembly 97 contains a lock 972, one end of lock 972 being connected to a resilient member 971 and the other end being connected to a button 974, a fastener 973 restraining lock 972 to mounting compartment 98, resilient member 971 driving lock 972 laterally within mounting compartment 98 to a locked position. The hand-held instrument 1 comprises a handle assembly 2 and a core assembly 3. Wherein the drive tail 479 mates with the second handle 93 and the resilient member 971 drives the lock 972 laterally within the mounting pocket 98 to a locked position and mates with the limit slot 48, and the connector 575 mates with the runner 951 and transfers rotational torque from the runner to the inner core assembly. The first handle and the second handle rotate around the handle rotating shaft, so that the driving tail 479 is pushed to move axially, the driving head is pushed to move axially, the first connecting rod and the second connecting rod are driven to move and rotate, the first jaw tail and the second jaw tail are driven to rotate, and the first jaw head and the second jaw head are closed or opened. Depressing button 97 compresses resilient member 971 to move lock 972 laterally away from the locked position, disengaging limit groove 48 from lock 972, thereby separating core assembly 3 from handle assembly 2.

As will be appreciated in connection with fig. 1-3 and fig. 9-14, in a preferred design, the core assembly 3 comprises three states, an operative state, a critical state and a separated state, and the drive head 70 corresponding thereto comprises a working displacement Lw1, a critical displacement Le1 (displacement measurement means: shortest distance of the first drive shaft axis and the kingpin axis), wherein Lw1> Le1.

When the driving head is in working displacement Lw1, the first pin head is kept in contact with the second column surface, namely the first meshing pair is in a meshing state, and the second pin head is kept in contact with the first column surface, namely the second meshing pair is in a meshing state. Under the working state, the first handle and the second handle are operated to drive the first jaw and the second jaw to be closed or opened within the angle range of 0-A1. Typically, A1 is designed to be 65-85.

When the driving head is in critical displacement Le1, the first handle and the second handle are continuously operated to be far away from each other, so that the driving head moves towards the direction of reducing the distance between the axis of the first driving shaft and the axis of the main pin, at the moment, the opening angle of the first jaw and the second jaw reaches the maximum limit angle A1, le1 is not reduced any more, and the driving head continuously operates to be far away from each other, at the moment, the driving head pushes the first jaw tail and the second jaw tail to move towards the far end, and further pushes the first pin head and the second pin head to move towards the far end and push the first seaming and the second seaming to open.

The separation state is that under the critical state, the first handle and the second handle are continuously operated to be far away from each other, the first pin head and the second pin head are pushed to move towards the far end, the first and the second seaming is completely expanded and slipped into the first and the second guiding ports, namely, the first and the second seaming pairs are in the failure separation state, and therefore separation of the inner rod assembly and the outer tube assembly is achieved.

It will be appreciated by those skilled in the art that the first and second links, the first and second tail jaws and the drive head may be sized and shaped to adjust the particular value of Le1 according to the actual needs of the surgical instrument. An additional limiting mechanism can be added to limit the displacement of the driving head to the working displacement Lw1> Le1 during the use of the apparatus 1, so as to prevent the driving head from falling out during the use.

In another version, the core assembly 3 has no significant threshold, i.e., the operating force moves the first and second handles away from each other, failing to push the first and second pin heads fully apart and the first and second jaws. It will be appreciated by those skilled in the art that the inner rod assembly and the outer tube assembly may be separated from each other by pushing or pulling the inner rod assembly and the outer tube assembly, respectively, with an auxiliary tool to push the first and second pin heads distally, fully expanding and sliding the first and second jaws into the first and second guide openings, i.e., the first and second jaw pairs are in a deactivated separated state, thereby effecting separation of the inner rod assembly and the outer tube assembly.

The reassembling of the inner rod assembly and the outer tube assembly is the reverse operation of the disassembling action, namely, the first handle and the second handle are operated to be mutually folded, the first pin head and the second pin head are pulled to move towards the proximal end through the first guide opening and the second guide opening, the first and the second seaming openings are fully expanded and clamped into the first second column surface, namely, the first pin head is kept in contact with the second column surface, namely, the first seaming pair is in a seaming state, and the second pin head is kept in contact with the first column surface, namely, the second seaming pair is in a seaming state, so that the reassembling of the inner rod assembly and the outer tube assembly is realized. Similarly, the auxiliary tool can be used for reloading.

The reusable endoscopic hand-held instrument is typically detachable into a handle and core assembly for removal, cleaning, reinstallation and sterilization prior to use. The sterilization mode is usually high-temperature damp heat sterilization or low-temperature plasma sterilization, however, no matter what sterilization mode is adopted, the used instrument must be thoroughly cleaned, and the instrument can be used for operation again after being sterilized according to the corresponding sterilization procedure. In the operation, the head of the instrument needs to operate the tissue in the patient, and the motion joint of the head instrument is easy to leave tissue residues and is difficult to clean. To address this problem, the prior art discloses a solution for disassembling the core assembly into 2-parts, 3-parts. However, to date, the prior art and the commercially available multiplexed laparoscopic hand-held devices have been disclosed in which the first jaw, second jaw and base of the head are not generally detachable. This results in the fact that the revolute joints between the first jaw, the second jaw and the base are prone to residual diseased tissue or bacterial virus, are extremely difficult to clean, render the sterilization process unreliable and present a risk of cross-infection. When the inner rod assembly and the outer tube assembly of the inner core assembly 3 are disassembled, the base and the first jaw and the second jaw can be separated, and the problem that residual tissues in the base are extremely difficult to clean is effectively solved. The detachable mechanism makes each revolute pair at the head of the inner rod assembly more robust, and the strength and accuracy of the detachable mechanism are effectively improved while the detachable mechanism is detachable.

The securing between the retainer ring 46 and the second pin head 455 is many, including but not limited to, interference fit, welding, adhesive, etc. Laser welding is preferred. Considering that the primary operating load experienced by the kingpin 45 is shear load, and the operating load experienced by the retaining ring 46 is relatively small, a modified kingpin 45a (see fig. 15-16) includes a first pin head 451, a second pin head 455a and a pin flange 453 disposed therebetween, the second pin head 455a including a pin groove 457. The retainer 46a includes a retainer aperture 465a defined by an annular tab 461a and sized to mate with the pin ring groove 457, and in one alternative the retainer 46a further includes a retainer opening 463a to facilitate assembly.

Referring to fig. 15-16, the first tail 413 and the second tail 423 are stacked on each other, the second pin head 455a passes through the first base hole 415 and the second base hole 425, and the retainer ring 46a is fixed in the pin ring groove 457 to fix the first and second tails together and form a first rotating pair rotatable about the main pin 45 a. In one arrangement, the collar openings 463a may be welded together to enhance the securement integrity. Alternatively, the ring segment 461a may be welded to the first tail 413. When a welding scheme is adopted, the retainer ring 46a can be divided into 2 pieces or more to be spliced so as to facilitate assembly. The welding retainer ring or the welding retainer ring and the jaw tail are not welded to the main pin, so that the influence of welding on the main pin can be reduced, and shearing fracture is prevented.

Referring now to fig. 9-11, and referring primarily to fig. 11, in a preferred embodiment, the end face of the first link shaft 435 includes a first blind hole 439 defined by a first shaft wall 436, and when the first link shaft 435 is assembled by penetrating the first tail hole 414, a tool is used to force the first shaft wall 436 to evert and deform to form a first curl (not shown), thereby fixing the first link head 431 and the first jaw tail 413 together and forming a second revolute pair rotatable about the first link shaft 435. The end surface of the second link shaft 445 includes a second blind hole 449 defined by a second shaft wall 446, a second bead (not shown) formed by forcing the second shaft wall 446 to evert and deform by a tool after the second link shaft 445 is assembled to penetrate the second tail hole 424, and a third revolute pair formed by fixing the second link head 441 and the second jaw tail 423 together and rotatable about the second link shaft 445.

Referring to fig. 10, similarly, the end face of the first driving shaft 473 includes a third shaft wall 472, and when assembled, after the first driving shaft 473 is inserted through the first connecting rod hole 437, the tool is used to force the third shaft wall 472 to turn outwards to form a third bead (not shown), so as to fix the first connecting rod tail 433 and the driving head 471 together and form a fourth revolute pair rotatable about the first driving shaft 473. The end face of the second driving shaft 475 includes a fourth shaft wall 474, the second driving shaft 475 is inserted through the second connecting rod hole 447 when assembled, and the fourth shaft wall 474 is forced to be turned outwards and deformed to form a fourth curled edge (not shown) by using a tool, so that the second connecting rod tail 443 and the driving head 471 are fixed together and form a fifth revolute pair capable of rotating around the second driving shaft 475.

It should be understood by those skilled in the art that the first, second, third and fourth crimping structures disclosed above may also form a small crimp at the end of the striking shaft without the first (second, third and fourth) shaft walls, and still prevent the second (third, fourth and fifth) revolute pair from being disengaged. The driving head 471 disclosed above, the first driving shaft 473 and the second driving shaft 475 are integrally connected, however, a driving head through hole may be provided in the driving head, and an additional shaft may be riveted in the driving head through hole to constitute the first driving shaft and the second driving shaft. The driving head can be clamped between the tail parts of the first connecting rod and the second connecting rod, the additional shaft penetrates through the first connecting rod hole, the second connecting rod hole and the driving head through hole, and then the driving head is riveted to form a fourth fifth revolute pair. Still further approximation alternatives are also conceivable and are not described in detail here.

The US patent US5489290, US5947996, US6340365, US7931667, US8551077, US8926599, etc. disclose various quick connect and disconnect mechanisms for the core assembly to the reusable handle, which are slightly adapted and can be used for the connection between the core assembly and the reusable handle of the present invention. To date, the field of minimally invasive surgical instruments has disclosed a number of ways of connecting the core assembly to the handle of a minimally invasive surgical instrument, with slight adaptations of the way that can be used to connect the core assembly to the handle of the present invention, which is not exhaustive. It should be appreciated by those skilled in the art that the first, second, third, fourth and fifth elements are not in the exact order illustrated, but are merely for simplicity and accuracy of description.

Claims

1. An easily detachable inner core assembly, comprising an inner rod assembly and an outer tube assembly, wherein the outer tube assembly comprises a base and a hollow outer tube, characterized in that:

1) The inner rod assembly comprises a first jaw, a second jaw, a first connecting rod, a second connecting rod, a king pin, a retaining ring and a driving rod;

2) The proximal end of the first jaw comprises a first jaw tail and a first basal hole extending transversely therethrough; the proximal end of the second jaw comprises a second jaw tail and a second basal hole extending transversely therethrough;

3) The kingpin comprises a pin head and a pin flange, the first jaw tail and the second jaw tail are stacked on each other, the kingpin passes through the first base hole and the second base hole, and the retaining ring is fixed together with the kingpin or the second jaw tail, so that the first and second jaw tails are fixed between the pin flange and the retaining ring to form a first rotating pair that can rotate around the kingpin;

4) The first jaw tail and the first connecting rod match to form a second rotation pair, and the second jaw tail and the second connecting rod match to form a third rotation pair;

5) The first connecting rod and the driving rod are matched to form a fourth rotation pair, and the second connecting rod and the driving rod are matched to form a fifth rotation pair;

6) Move the driving rod so that the first, second, third, fourth and fifth rotating pairs can rotate simultaneously;

7) The inner rod assembly is installed in the outer tube assembly, wherein the main pin matches the base to form a quickly detachable structure.

2. The inner core assembly according to claim 1, characterized in that:

1) The kingpin comprises a first pin head, a second pin head and a pin flange arranged therebetween, the second pin head comprises a pin ring groove, and the retaining ring comprises a retaining ring hole defined by an annular sheet and having a shape and size matching the pin ring groove;

2) The first jaw tail and the second jaw tail are stacked on each other, the second pin head passes through the first base hole and the second base hole, and the retaining ring is fixed in the pin ring groove, fixing the first and second jaw tails together to form a first rotating pair that can rotate around the kingpin.

3. The inner core assembly as claimed in claim 2, characterized in that the retaining ring further comprises a retaining ring opening, and the annular sheet of the retaining ring is welded together with the first jaw tail or the second jaw tail.

4. The inner core assembly according to claim 1, characterized in that:

1) The first connecting rod comprises a first connecting rod head and a first connecting rod tail and a first connecting rod body extending therebetween, the first connecting rod head comprises a first connecting rod shaft extending laterally outward, and the first connecting rod tail comprises a first connecting rod hole extending laterally therethrough;

2) The second connecting rod comprises a second connecting rod head and a second connecting rod tail and a second connecting rod body extending therebetween, the second connecting rod head comprises a second connecting rod shaft extending laterally outward, and the second connecting rod tail comprises a second connecting rod hole extending laterally therethrough;

3) The proximal end of the first jaw tail includes a first tail hole, which is fixed together with the first connecting rod shaft to form a second rotation pair; the proximal end of the second jaw tail includes a second tail hole, which is fixed together with the second connecting rod shaft to form a third rotation pair.

5. The inner core assembly according to claim 4, characterized in that:

1) The end surface of the first connecting rod shaft includes a first blind hole defined by a first shaft wall. After the first connecting rod shaft penetrates the first tail hole, the first shaft wall is deformed outward to form a first curling edge. The first curling edge restricts the separation of the second revolute pair.

2) The end face of the second connecting rod shaft includes a second blind hole defined by a second shaft wall. After the second connecting rod shaft penetrates the second tail hole, the second shaft wall is deformed outward to form a second curling edge. The second curling edge limits the separation of the third rotation pair.

6. The inner core assembly according to claim 4, characterized in that:

1) The driving rod comprises a driving head, and the driving head comprises a first driving shaft and a second driving shaft extending outward; the end surface of the first driving shaft comprises a third shaft wall, and the end surface of the second driving shaft comprises a fourth shaft wall;

2) After the first drive shaft penetrates the first connecting rod hole, the third shaft wall is deformed outwards to form a third curling edge to restrict the separation of the fourth rotation pair; after the second drive shaft penetrates the second connecting rod hole, the fourth shaft wall is deformed outwards to form a fourth curling edge to restrict the separation of the fifth rotation pair.

7. The inner core assembly according to claim 1, characterized in that:

1) The base comprises a first longitudinal reference plane and a second longitudinal reference plane perpendicular to each other and an intersecting main axis, and the base further comprises a base tail and a first main arm and a second main arm extending to the distal end, the first and second main arms are arranged on both sides of the first longitudinal reference plane, and the two define a U-shaped groove;

2) The base further comprises a first special-shaped groove and a second special-shaped groove, wherein the first special-shaped groove extends from the distal end to the proximal end of the first main arm along the second longitudinal reference plane and divides the first main arm into a first elastic arm and a second elastic arm; the second special-shaped groove extends from the distal end to the proximal end of the second main arm along the second longitudinal reference plane and divides the second main arm into a third elastic arm and a fourth elastic arm;

3) The pin head at one end of the main pin is clamped in the first special-shaped groove between the first elastic arm and the second elastic arm to form a first bite pair, and the pin head at the other end of the main pin is clamped in the second special-shaped groove between the second elastic arm and the third elastic arm to form a second bite pair;

4) The driving rod is moved from the distal end to the proximal end, so that the pin head at one end of the main pin can slide into the first special-shaped groove to form a first bite pair, and at the same time, the pin head at the other end of the main pin can slide into the second special-shaped groove to form a second bite pair;

5) Move the driving rod from the proximal end to the distal end, so that the pin head at one end of the main pin can slide out of the first special-shaped groove to separate the first bite pair, and at the same time, the pin head at the other end of the main pin can slide out of the second special-shaped groove to separate the second bite pair.

8. The inner core assembly according to claim 7, characterized in that:

1) The first special-shaped groove comprises a distal first guide opening, a first cylindrical surface and a first cutting groove, the maximum opening width of the first guide opening is H11, the diameter of the first cylindrical surface is D11, and the first guide opening and the first cylindrical surface intersect to form a first bite with an opening width of H12, wherein H11≥D11＞H12;

2) The second special-shaped groove comprises a distal second guide opening, a second cylindrical surface and a second cutting groove, the maximum opening width of the second guide opening is H21, the diameter of the second cylindrical surface is D21, and the second guide opening and the second cylindrical surface intersect to form a second bite with an opening width of H22, wherein H21≥D21＞H22;

3) The pin head at one end of the kingpin is embedded in the first cylindrical surface to form a first bite pair, and the pin head at the other end of the kingpin is embedded in the second cylindrical surface to form a second bite pair.

9. The inner core assembly according to claim 8, characterized in that:

1) The inner core assembly includes three states: working state, critical state and separation state, and the corresponding driving head includes working displacement Lw1 and critical displacement Le1, wherein Lw1＞Le1;

2) Working state: when the driving head is at the working displacement Lw1, the pin head of the main pin keeps in contact with the first and second cylindrical surfaces, that is, the first and second occlusal pairs are in the occlusal state; moving the driving rod can close or open the first and second jaws within the angle range of 0~A1;

3) Critical state: When the drive head is at the critical displacement Le1, the drive rod continues to move from the proximal end to the distal end. At this time, the opening angle of the first and second jaw heads reaches the maximum limit angle A1, and Le1 no longer decreases, so that the drive head pushes the first and second jaw tails toward the distal end, thereby pushing the pin head of the main pin toward the distal end and pushing the first bite and the second bite to open;

4) Separation state: In the critical state, the driving rod continues to move from the proximal end to the distal end, pushing the pin head of the main pin toward the distal end, completely expanding the first and second bites and sliding into the first and second guide openings, that is, the first and second bite pairs are in a failed separation state, thereby realizing the separation of the inner rod assembly and the outer tube assembly.

10. A surgical instrument for minimally invasive surgery, the instrument comprising an inner core assembly as described in any one of claims 1-9, and also comprising a handle assembly matching therewith; the handle assembly comprises a rotating wheel assembly, a button assembly, a handle shaft and a first handle and a second handle rotating around the handle; the outer tube assembly of the inner core assembly matches the rotating wheel assembly and the button assembly; the drive rod comprises a drive head, a drive tail and a drive rod extending therebetween, the drive tail is connected to the second handle, the first handle and the second handle rotate around the handle shaft to move the drive tail, thereby pushing the drive head to move, thereby driving the first, second, third, fourth, and fifth rotating pairs to rotate, thereby driving the first and second jaws to rotate around the first rotating pair to open or close.