CN119606480A

CN119606480A - A surgical drill

Info

Publication number: CN119606480A
Application number: CN202411827378.9A
Authority: CN
Inventors: 黎庆初; 周皓楠; 王红军; 王汉文; 李伟; 徐凯; 井春艳
Original assignee: Third Affiliated Hospital Of Southern Medical University (academy Of Orthopaedics Guangdong Province); Shaanxi Yagemai Medical Technology Co ltd
Current assignee: Third Affiliated Hospital Of Southern Medical University (academy Of Orthopaedics Guangdong Province); Shaanxi Yagemai Medical Technology Co ltd
Priority date: 2024-12-12
Filing date: 2024-12-12
Publication date: 2025-03-14

Abstract

The application discloses a surgical abrasive drill, which belongs to the technical field of medical equipment, and particularly comprises a machine element and at least one connecting sleeve, wherein a grinding head rod with a grinding head arranged at the end part is penetrated in the connecting sleeve, a groove is circumferentially arranged in a nearby area of one end, far away from the grinding head, of the grinding head rod, one end, far away from the grinding head, of the grinding head rod is symmetrically cut along two sides of an axis to form a clamping section with a platform, the machine element comprises a machine element body which is constructed into a coaxial cylinder with a plurality of sections of different diameters and can perform rotary motion, the machine element body comprises a front end section, a middle section and a tail end section, a long shaft hole matched with the outer diameter of the grinding head rod is formed through the front end section and extends to a clamping groove, a positioning hole is circumferentially arranged on the middle section corresponding to the groove, and a ball is arranged in the positioning hole. The present application provides a structure that rotates coaxially and facilitates installation and replacement of the grinding bit shank.

Description

Surgical abrasive drill

Technical Field

The invention relates to a medical apparatus, in particular to a surgical abrasive drill, which is provided with a machine element body capable of rotating in the form of a plurality of sections of coaxial cylinders with different diameters, and provides a structure which coaxially rotates and is convenient for installing and replacing an abrasive head rod.

Background

The surgical abrasive drill is also called abrasive drill, and is mainly used in clinical operations such as orthopaedics and brain surgery which need cutting or polishing. Avoiding shaft deviation rotation is an important guarantee for the working performance of the grinding head drill, and during high-speed rotation, the service life of the grinding head drill is influenced by small shaft deviation, so that the mounting mode and coaxial rotation of the grinding head rod are required to be improved.

Disclosure of Invention

The invention mainly aims to provide a structure which coaxially rotates and is convenient for installing and replacing a grinding head rod, so that the working stability of a grinding head drill is improved, and the service life of the grinding head drill is prolonged.

In order to achieve the above object, the present invention provides a surgical abrasive drill, the surgical abrasive drill has a machine element and at least one coupling sleeve, a grinding head rod with a grinding head disposed at an end is penetrated in the coupling sleeve, the grinding head rod has a cylindrical structure, a groove is circumferentially formed in a vicinity of an end of the grinding head rod far away from the grinding head, a clamping section with a platform is symmetrically cut along two sides of an axis at the end of the grinding head rod far away from the grinding head, the machine element comprises a machine element body which is configured to have coaxial cylinders with multiple sections of different diameters and can perform rotational movement, the machine element body comprises a front end section and a tail end section for assembling bearings, and a middle section coaxially disposed between the front end section and the tail end section, a clamping groove matched with the clamping section is axially disposed in the middle section, a long shaft hole matched with an outer diameter of the grinding head rod is formed through the front end section and extends to the clamping groove, and a positioning hole is circumferentially formed in the middle section and is configured with a ball positioning hole.

Preferably, the at least one coupling sleeve is coupled by a threaded structure, and a bearing matched with the outer diameter of the grinding head rod is arranged in the coupling sleeve.

Preferably, the diameter of the leading section is equal to the diameter of the trailing section.

Preferably, the number of the positioning holes is 3 or 4 or 6.

Preferably, a flange for preventing the balls from being separated is arranged in the positioning hole close to the grinding head rod side.

Preferably, the diameter of the balls is 1.2 to 1.5 times the thickness of the wall of the intermediate section.

Preferably, the groove has upper and lower lateral surfaces inclined to each other in a taper angle in a radial direction of the grinding head bar, and the taper angle ranges from 60 ° to 120 °.

Preferably, the machine element further comprises a long shaft sleeve coaxially arranged outside the intermediate section of the machine element body and surrounding the balls, the long shaft sleeve being axially slidable along the intermediate section, the long shaft sleeve being provided with wedge-shaped cutouts corresponding to the sections surrounding the balls, the wedge-shaped cutouts being coaxial with the long shaft sleeve.

Preferably, the end of the wedge-shaped cut is provided with a horizontal end, the inner diameter of which is larger than the outer diameter of the intermediate section.

Preferably, the clearance of the horizontal end from the wall of the intermediate section and the thickness of the wall fully accommodates the balls.

The surgical grinding drill provided by the application is characterized in that the machine element body capable of rotating is constructed in a coaxial cylinder form with a plurality of sections of different diameters, the machine element body is provided with the long shaft hole, the clamping groove and the positioning hole, and the coaxial rotation is realized through the cooperation of the bearings, so that the surgical grinding drill has the characteristics of convenience in installation and replacement of a grinding head rod.

Drawings

Fig. 1 is an overall perspective view of a surgical abrasive drill according to the present invention.

Fig. 2 is a perspective view of a surgical abrasive drill according to the present invention.

Fig. 3 is a cross-sectional view of a coupling sleeve according to the present invention.

Fig. 4 is a perspective view of a grinding bit bar according to the present invention.

Fig. 5 is a partial cross-sectional view of a surgical abrasive drill according to the present invention.

Fig. 6 is a perspective view of a machine element body according to the present invention.

Fig. 7 is a partial cross-sectional view of a surgical abrasive drill according to the present invention.

Fig. 8 is an enlarged view of a in fig. 7.

Fig. 9 is a partial cross-sectional view of a surgical abrasive drill according to the present invention.

Reference numerals and names:

10. a medical device;

12. A surgical abrasive drill;

14. a housing;

16. A driving motor;

18. a transmission device;

20. A machine element;

201. A machine element body;

2011. Front end section 2012, rear end section 2013, middle section 20131, clamping groove 20132, long shaft hole 20133, positioning hole 20133a, flange 20134, wall 2014, blocking protrusion;

202. A bearing;

203. A ball;

204. long shaft sleeve, 2041, section, 2042, wedge cut, 2043, horizontal end, 2044, baffle

22. A coupling sleeve;

221. sleeve body 222, internal threads, 223, coupling member 224, external threads;

24. a grinding head rod;

241. Grooves 2411, lateral surfaces 2412, taper angles 2413, depth;

242. Clamping section

26. Grinding head;

28. a bearing;

30. A longitudinal central axis;

r1, the outside inner diameter of the sleeve body;

r2, the inner diameter of the inner side of the sleeve body;

r3, the external diameter of the connecting piece;

r4, the inner diameter of the connecting piece;

r5, the inner diameter of the bearing;

r6, diameter;

D1, thickness;

W1, a spring.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure.

One embodiment of a medical instrument, generally designated by the reference numeral 10, for a surgical burr 12 is schematically illustrated in fig. 1.

The medical device 10 includes a housing 14 that serves as a handle, with a drive motor 16 disposed within the housing 14. The energy storage power source, including solid or semi-solid or liquid energy storage media such as lithium ion batteries, sodium ion batteries, etc., may be selectively utilized to provide operating voltage to the drive motor 16 independently of the mains or to the drive motor 16 after conversion by the mains or by a switching power source.

The drive motor 16 may be selected from a dc motor, a brushless motor, a magnetic levitation motor, or other drive capable of providing a driving force.

The transmission 18 is coupled to the drive shaft of the drive motor 16 and the machine element 20 is coupled to the transmission 18, alternatively the machine element 20 may also be coupled directly to the drive shaft of the drive motor 16.

The machine element 20 further comprises a coupling sleeve 22 at its end remote from the transmission 18, the coupling sleeve 22 being detachably coupled to the machine element 20.

As shown in fig. 1 and 2, a grinding head rod 24 with a grinding head 26 at the end is penetrated in the coupling sleeve 22, and the grinding head 26 is provided with grains or tooth grooves. The coupling sleeve 22 may be provided in a plurality of stages and be rapidly coupled by a screw structure, and a bearing 28 is provided at an inner end region of the coupling sleeve 22, so that friction between the grinding bit shaft 24 and an inner wall of the coupling sleeve 22 can be prevented when the grinding bit shaft 24 is rotated at a high speed, and centrifugal rotation of the grinding bit shaft 24 can be prevented, thereby degrading the performance of the apparatus.

As shown in fig. 2 and 3, the coupling sleeve 22 is provided with female threads 222 at both ends on the sleeve body 221, and constitutes an outer inner diameter R1 of the sleeve body 221, and an inner diameter R2 of the sleeve body 221 is smaller than the outer inner diameter R1 of the sleeve body 221 (i.e., R2< R1). When a plurality of coupling sleeves 22 are provided, the coupling sleeves 22 are coupled by a coupling member 223 having an external thread 224, the external thread 224 is engaged with the internal thread 222 on the sleeve body 221, the outer diameter R3 of the coupling member 223 is engaged with the outer diameter R1 of the sleeve body 221, and the inner diameter R4 of the coupling member 223 is equivalent to the inner diameter R2 of the sleeve body 221. The bearing 28 is disposed at an outer inner diameter of the sleeve body 221 and is positioned and fixed by the coupling 223, wherein an inner diameter R5 of the bearing is smaller than an inner diameter R2 of the sleeve body 221 and also smaller than an inner diameter R4 of the coupling 223 and matches a diameter of the grinding bit bar 24.

Referring to fig. 4 and 5, the grinding bit rod 24 has a cylindrical structure, and a groove 241 is circumferentially formed in a vicinity of an end far from the grinding bit 26, and a part of the end far from the grinding bit 26 on the grinding bit rod 24 is symmetrically cut along two sides of the axis to form a clamping section 242 with a platform. The grinding bit shank 24 defines a longitudinal central axis 30.

With the machine element 20 parallel to the longitudinal central axis 30 and kept concentric, the machine element body 201 of the machine element 20 is subjected to a rotational movement by means of a drive motor 16 coupled to the transmission 18.

To ensure that the machine element body 201 and the grinding bit shank 24 rotate coaxially, the machine element body 201 is configured in the form of a coaxial cylinder having a plurality of segments of different diameters, and more particularly, with reference to fig. 5, 6 and 7, includes a leading end segment 2011 and a trailing end segment 2012 for assembling the bearing 202, the leading end segment 2011 and the trailing end segment 2012 being of equal diameter to facilitate assembling the same type of bearing 202.

An intermediate section 2013 with a diameter larger than that of the front section 2011 or the rear section 2012 is coaxially arranged between the front section 2011 and the rear section 2012, a clamping groove 20131 matched with the clamping section 242 of the grinding head rod 24 is arranged at the intermediate position of the intermediate section 2013 along the direction of the longitudinal central axis 30, a long shaft hole 20132 matched with the outer diameter of the grinding head rod 24 is formed through the front section 2011 and extends to the clamping groove 20131 of the intermediate section 2013, a positioning hole 20133 is formed in the intermediate section 2013 in the circumferential direction of a groove 241 on the corresponding grinding head rod 24, and a ball 203 is arranged in the positioning hole 20133.

The positioning holes 20133 on the middle section 2013 are uniformly distributed circumferentially, and the number of the positioning holes 20133 is 3, 4, 6 or more, preferably 3 or 4.

The ball 203 has a diameter R6, the diameter R6 of the ball 203 being greater than the thickness D1 of the wall 20134 of the middle section 2013, preferably R6 is equal to 1.2-1.5 times the thickness D1.

A flange 20133a is provided in the positioning hole 20133 on the side near the grinding bit shank 24, the flange 20133a serving to prevent the balls 203 from coming out into the long shaft hole 20132 in the radial direction of the machine element body 201 (see fig. 8).

Groove 241 on the grinding bit shank 24 has upper and lower lateral surfaces 2411 for facilitating removal of the ball 203 from the groove 241 when the grinding bit shank 24 is installed or replaced. The two lateral surfaces 2411 are inclined to each other in the form of a taper angle 2412 near in the radial direction of the grinding bit shank 24. The cone angle 2412 ranges from 60 ° to 120 °.

The groove 241 on the grinding bit shank 24 has a depth 2413. The depth 2413 of the groove 241 is closely related to the taper 2412 of the two lateral surfaces 2411 (the width of the groove remains constant). When ball 203 is assembled with groove 241, the point on the sphere of ball 203 contacts two lateral surfaces 2411 on groove 241, and when taper 2412 selects a larger angle, the tangent point (contact point) of two lateral surfaces 2411 with ball 204 moves down, i.e., the length of the cut line in the cross-section decreases, and correspondingly, the length of the line perpendicular to the cut line and extending beyond the center to the surface of ball 204 decreases, and depth 2413 of groove 241 decreases. Thereby, it is ensured that the balls 204 are more easily separated from the grooves 241, facilitating the installation and replacement of the grinding bit shank. In addition, machining of the grooves 241 to the lesser depth 2413 may avoid reducing the strength of the grinding bit shank 24.

Referring to fig. 9, machine element 20 further includes a long shaft sleeve 204, long shaft sleeve 204 being disposed coaxially with longitudinal central axis 30 outside of middle section 2013 of machine element body 201 and surrounding ball 203. The long shaft sleeve 204 can slide axially along the middle section 2013 of the machine element body 201, the long shaft sleeve 204 is provided with a wedge-shaped notch 2042 corresponding to the section 2041 surrounding the ball 203, the wedge-shaped notch 2042 is coaxial with the long shaft sleeve 204, and a horizontal end 2043 is provided at the end of the wedge-shaped notch 2042, at this time, the inner diameter of the horizontal end 2043 is larger than the outer diameter of the middle section 2013, more specifically, the gap between the horizontal end 2043 and the wall 20134 of the middle section 2013 and the thickness D1 of the wall 20134 can completely accommodate the ball 203 with the diameter R6 (dashed line in the figure). In coordination with one another as described above, the balls 203 are enabled to roll in the radial direction of the machine element body 201 and out of the grooves 241 on the grinding bit shank 24 when the grinding bit shank 24 is pulled out.

The end of the long shaft sleeve 204 far away from the section 2041 is provided with a baffle 2044, and the baffle is matched with a spring W1 sleeved on the middle section 2013, so that axial direction acting force is applied to the long shaft sleeve 204, the wedge-shaped notch 2042 generates radial pressure on the ball 203 under the action of the axial acting force, the ball 203 is forced to enter the groove 241 of the grinding head rod 24, and meanwhile locking and coaxial fixation of the grinding head rod 24 are realized.

Referring to fig. 7 again, the spring W1 is sleeved on the middle section 2013 and abuts against the blocking protrusion 2014 provided on the middle section 2013 and the tail section 2012, and the other end of the spring W1 abuts against the blocking portion 2044 on the long shaft sleeve 204.

It should be noted that, the transmission device 18 is connected to the tail end section 2012 of the machine element body 201, and specific connection manners include other manners of hinging, clamping, and the like, and the connection manners are not limited.

Claims

1. Surgical abrasive drill, characterized in that the surgical abrasive drill (12) has a machine element (20) and at least one coupling sleeve (22), a grinding head rod (24) with grinding heads (26) arranged at the end is penetrated in the coupling sleeve (22), the grinding head rod (24) is of a cylinder structure, a groove (241) is circumferentially formed in a nearby area of the grinding head rod (24) which is far away from one end of the grinding head (26), a clamping section (242) with a platform is symmetrically cut on one end of the grinding head rod (24) which is far away from the grinding head (26) along the two sides of an axis, the machine element (20) comprises a machine element body (201) which is configured into a coaxial cylinder with a plurality of sections of different diameters and can perform rotary motion, the machine element body (201) comprises a front end section (2011) and a tail end section (2012) for assembling a bearing, and a middle section (2013) coaxially arranged between the front end section (2011) and the grinding head section (2012), a clamping groove 20132 which is axially arranged on the middle section (2013) and matched with the clamping section (20131) and extends to the outer diameter of the grinding head (20132), and a positioning hole (20133) is formed in the middle section (2013) corresponding to the groove (241) in the circumferential direction, and a ball (203) is arranged in the positioning hole (20133).

2. Surgical burr according to claim 1, characterized in that the at least one coupling sleeve (22) is coupled by a threaded structure, a bearing being provided in the coupling sleeve (22) matching the external diameter of the burr rod (24).

3. The surgical burr of claim 2, wherein a diameter of the leading end section (2011) is equal to a diameter of the trailing end section (2012).

4. A surgical abrasive drill according to claim 3, characterized in that the number of positioning holes (20133) is 3 or 4 or 6.

5. Surgical burr according to claim 4, characterized in that a flange (20133 a) for preventing the balls (203) from coming off is provided in the positioning hole (20133) close to the side of the burr rod (24).

6. The surgical burr of claim 5, wherein the diameter of the ball (203) is 1.2-1.5 times the thickness of the wall (20134) of the middle section (2013).

7. The surgical burr of claim 1, wherein the recess (241) has upper and lower lateral surfaces (2411) adjacent to each other in a radial direction of the burr shaft (24) in the form of a taper angle (2412), the taper angle (2412) ranging from 60 ° to 120 °.

8. The surgical burr of any of claims 1 to 7, wherein the machine element (20) further comprises a long shaft sleeve (204) coaxially arranged outside a middle section (2013) of the machine element body (201) and surrounding the balls (203), the long shaft sleeve (204) being axially slidable along the middle section (2013), the long shaft sleeve (204) being provided with wedge-shaped cutouts (2042) corresponding to the sections (2041) surrounding the balls (203), the wedge-shaped cutouts (2042) being coaxial with the long shaft sleeve (204).

9. The surgical abrasive drill according to claim 8, characterized in that the end of the wedge-shaped incision (2042) is provided with a horizontal end (2043), the inner diameter of the horizontal end (2043) being larger than the outer diameter of the middle section (2013).

10. The surgical burr of claim 8, wherein a gap of the horizontal end (2043) with a wall (20134) of the middle section (2013) and a thickness of the wall (20134) may fully accommodate the ball (203).