CN101357088B - Banding self-ejection type intervention apparatus conveying system - Google Patents

Abstract

The invention relates to a binding self-elastic interventional device delivery system in the technical field of medical devices, wherein: an inner tube is sheathed in a middle tube, the entire inner tube passes through the middle tube, the distal end of the inner tube is connected with a conical head, and the middle tube The proximal end of the tube is connected with the handle connecting piece, and its distal end is equipped with a limiter. The side tube and the middle tube are arranged in parallel. The proximal end of the bracket is fixed on the middle tube behind the limiter, the other end of the binding wire is bound on the pull rod, the bracket is bound on the inner tube between the conical head and the limiter through the binding wire, and the inner cavity of the conical head It communicates with the inner cavity of the inner tube, and the pull rod passes through the side tube, then through the limiter, the binding wire, and finally inserted into the tapered head. The invention cancels the traditional sheath-type delivery system, effectively reduces the outer contour size of the delivery device, and improves the flexibility and accurate positioning performance of the delivery device.

Description

Banding self-elastic interventional device delivery system

technical field

The invention relates to a delivery system in the technical field of medical instruments, in particular to a delivery system for binding self-elastic interventional instruments.

Background technique

Interventional therapy technology has been widely used in the medical field. In the early application, self-elastic interventional devices such as self-elastic stents mostly use catheter delivery system, that is, the interventional device to be implanted is put into the sheath, and the stent is sent out from the catheter and bounced off after being sent to the implantation site. . The disadvantages of this method: 1) because the interventional instrument needs to be pressed into the sheath tube and can be pushed out of the sheath at a long distance, the sheath tube must have a certain diameter, which increases the size of the delivery system. 2) The thicker size of the delivery sheath reduces the axial compliance of the delivery device, which makes it difficult to reach the ideal site or cause damage to organs. 3) It is easy to cause displacement of the stent during the process of pushing the instrument out of the sheath.

After searching the literature of the prior art, it is found that the Chinese utility model patent number is ZL01266548.7, and the name is "catheter delivery by stent technology in the cavity"; Stent Implant". These two patents all propose a delivery device that binds the stent with wires, but there are still certain shortcomings: ZL01266548.7 fails to get rid of the structure of the double-layer catheter, which makes the delivery catheter relatively hard and lacks axial flexibility. The pull wires in the two patents all pass through the center of the central catheter, which coincides with the guide wire channel that must be used in interventional techniques, and the pull wire and guide wire interfere with each other during operation. The handles of both are too simple to create separate channels for the guidewire and drug and contrast media. In addition, there is a risk of entanglement in long-distance cables.

Contents of the invention

The purpose of the present invention is to address the deficiencies of the prior art, to provide a binding self-elastic interventional device delivery system, which cancels the traditional sheath delivery system, effectively reduces the outer contour size of the delivery device, and improves the delivery system of the delivery device. Flexibility and accurate positioning performance.

The present invention is achieved through the following technical solutions, the present invention includes an inner tube, a handle connector, a middle tube, a side tube, a limit piece, a bracket, a tapered head, a pull rod, and a binding wire, wherein: the inner tube is sleeved in the middle tube , the whole inner tube passes through the middle tube, the distal end of the inner tube is connected with the conical head, the proximal end of the middle tube is connected with the handle connector, and the far end is equipped with a stopper, the side tube and the middle tube are arranged in parallel, and the side tube The near and far ends are the same as the middle pipe, linking to each other with the handle connector and the limiter respectively, one end of the binding wire is fixed on the middle pipe behind the limiter, and the other end of the binding wire is bound and knotted on the pull rod. The stent is bound on the inner tube between the conical head and the limiter through a binding wire, the inner cavity of the conical head communicates with the inner cavity of the inner tube, the pull rod passes through the side tube, and then passes through the limiter and the binding wire. Finally insert into the conical head.

The outer diameter of the tapered head is slightly larger than the size of the bracket after binding, and its front end is tapered, like the head of a bullet, which can better pass through the lesion area, thereby guiding the entire system to advance smoothly, and its rear end is small tapered Or arc-shaped design to facilitate the withdrawal of the system from the body.

The pull rod is a metal wire, the far end of which is inserted into the side hole of the tapered head, and the near end of the pull rod is made into a pull ring for easy operation.

The proximal end of the stent is a limiter, and the end of the limiter close to the stent is a columnar cavity, and the proximal end of the stent can be inserted into the columnar cavity. In this way, the bracket can move forward and backward freely before being released.

The infusion tube and the tube joint on the side of the handle connector communicate with the gap between the middle tube and the inner tube, and can be used for injecting contrast medium or medicine.

One end of the binding wire is first fixed and bound on the middle tube behind the limiter. When binding the bracket, it needs to be bound around the pull rod from the proximal end of the bracket. The binding wire is wound along the outer circumference of the bracket, and when it meets the pull rod, it is wound around the pull rod in the direction of turning back. outside the bracket. Wrap around the bracket to the pull rod and then turn back around the pull rod in reverse. Then go around to the tie rod, and so on until the bracket is tied. The other end of the binding wire is bound and knotted on the pull rod. The binding wire is fixed on the middle pipe at the back of the stopper, and the effect is that the binding wire can go out thereupon when the conveyor is withdrawn from the body. Note that the distance between the binding wires wound on the bracket should be uniform. When the pull rod is pulled back, the binding wire will automatically separate from the pull rod one by one, and the bracket can bounce off by itself.

When in use, the stent is first delivered to the lesion. Fix the handle connector with one hand, and pull the ring at the proximal end of the pull rod with the other hand, and the bracket will be released and bounced off automatically. After release, the binding wire is withdrawn from the body together with the system.

The middle tube and side tubes can be replaced by double-lumen tubes.

The middle tube and the side tube can also be a three-chamber plastic tube, respectively leading to the inner tube, conveying the contrast solution and the pull rod, and the two ends of the plastic tube are respectively connected with the connector and the limiter.

Compared with the prior art, the present invention has the following advantages: due to the cancellation of the outer sheath tube, the outer diameter of the entire delivery system can be reduced; by selecting the appropriate hardness and axial flexibility of the middle tube, a reasonable push can be obtained The matching of controllability and axial flexibility facilitates accurate positioning during release; the release of the binding wire is controlled by a pull rod, which increases the reliability of release control and eliminates the risk of entanglement. The separation of the rod cavity and the guide wire cavity further increases the reliability of the guide wire passing through. The improvement of the handle connection makes it possible to inject contrast medium or other medicines conveniently during the interventional operation. The invention can be used for the delivery of stents in human lumens such as esophagus, bile duct, intestinal tract and blood vessels.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the present invention;

In the figure: 1 tailstock, 2 inner tube, 3 handle connector, 4 middle tube, 5 side tube, 6 limit piece, 7 bracket, 8 conical head, 9 pull rod, 10 infusion tube, 11 pipe joint, 12 guide Silk (supporting use), 13 binding wires.

Detailed ways

The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

As shown in FIG. 1 , this embodiment includes an inner tube 2 , a handle connector 3 , a middle tube 4 , a side tube 5 , a stopper 6 , a bracket 7 , a tapered head 8 , a pull rod 9 , and a binding wire 13 . The inner tube 2 is set in the middle tube 4, and the whole inner tube 2 passes through the middle tube 4, and the distal end of the inner tube 2 is connected with the conical head 8; the proximal end of the middle tube 4 is connected with the handle connector 3, and its far end The limiter 6 is installed; the side tube 5 is arranged in parallel with the middle tube 4, and the near and far ends of the side tube 5 are the same as the middle tube 4, and are respectively connected with the handle connector 3 and the limiter 6; the side of the handle connector 3 is connected with Infusion tube 10, the far-end of infusion tube 10 links to each other with pipe joint 11; On the inner tube 2 between the positioning parts 6, the inner cavity of the conical head 8 communicates with the inner cavity of the inner tube 2, and the pull rod 9 passes through the side tube 5, then passes through the stopper 6, the binding wire 13, and finally inserts the cone In the shape head 8.

The binding wire 13 is bound outside the support 7, and whenever it winds around the pull rod 9, it will wind back to the pull rod 9 in the direction of turning back. The binding method of the binding wire 13: the binding wire 13 first winds around the support 7 to the pull rod 9 , turn back a circle in the opposite direction and then go back to the pull rod 9, and then turn back to the pull rod 9 in the opposite direction, and so on until the bracket 7 is tied up. Note that the distance between the binding wire 13 and the bracket 7 should be uniform. When the pull bar 9 was pulled back, the binding wire 13 would break away from the pull bar 9 automatically, and the support 7 could bounce off voluntarily.

The guide wire 12 can pass through the lumen of the inner tube 2 .

The outer diameter of the tapered head 8 is slightly larger than the size of the bracket 7 after binding. Tapered or arc-shaped design facilitates withdrawal of the system from the body.

Described pull rod 9 is a metal wire, and its far end is inserted in the side hole of conical head 8, and the proximal end of pull rod 9 is made into pull-ring shape to facilitate operation.

The proximal end of the bracket 7 has a limiter 6, and the end close to the bracket 7 can be made into a columnar cavity, and the proximal end of the bracket 7 can be inserted into the columnar cavity. Bracket 7 can advance and retreat freely before releasing like this.

The infusion tube 10 and the pipe joint 11 on the side of the handle connector 3 communicate with the gap between the middle tube 4 and the inner tube 2 and can be used for injecting contrast medium or medicine.

The distal end of the inner tube 2 is connected to the conical head 8, the inner cavity of the two is connected, the proximal end of the inner tube 2 is connected to the tailstock 1, the guide wire 12 penetrates from the conical head 8, and passes through the inner tube 2 The inner cavity of the tailstock 1 passes through the proximal end.

The cavity between the inner tube 2 and the middle tube 4 can be used for injection of contrast agent or medicine, and communicates with the infusion tube 10 on the side of the handle connector 3. The pipe joint 11 is injected into, passes through the infusion tube 10 and enters the wall gap between the inner tube 2 and the middle tube 4, and sprays out from the distal end of the middle tube 4 to perform radiography or drug treatment of the lesion area.

The middle pipe 4 is a plastic pipe, and the middle pipe 4 is connected to the handle connector 3, and its length can be determined according to the needs of the conveying distance.

The middle pipe 4 and the side pipe 5 can be a double-cavity plastic pipe, which lead to the inner pipe 2 and the pull rod 9 respectively.

The middle tube 4 and the side tube 5 can also be two independent plastic tubes, the middle tube 4 is a double-lumen tube, one cavity is connected to the inner tube 2, and the other cavity can transport contrast fluid, and the side tube 5 is a single-lumen tube The tube, its inner cavity is connected to the tie rod 9, and the two can be thermally connected or connected with a heat-shrinkable tube or glued and other possible connection methods.

The middle tube 4 and the side tube 5 can also be a three-chamber plastic tube, which respectively pass through the inner tube 2, transport contrast solution and the pull rod 9, and the two ends of the plastic tube are respectively connected with the handle connector 3 and the stopper 6 , the connection can be possible connection methods such as adhesive connection or mechanical connection.

When in use, the proximal end of the guide wire 12 pre-entered into the human body is inserted into the tapered head 8 at the far end of the system to guide the system to the lesion position. The tapered head 8 is conical or bullet-shaped, which is convenient for passing through narrow lesions. If the position is not suitable, contrast solution can be injected through the pipe joint 11 to contrast and adjust the proper position of the system. If the appropriate lesion position has been reached, fix the handle connecting part 3 with one hand and pull the ring at the proximal end of the pull rod 9 with the other hand. Withdraw the pull rod 9, and drive the binding wire 13 bound on the pull rod 9 to gradually disengage. Without the restraint of the binding wire 13, the support 7 will automatically bounce off, and the upper limit member 6 restricts the support 7 and the pull rod 9 to retreat together. Ensure that the stent 7 does not move when it is released, and ensure that the stent is placed in a suitable lesion position.

Claims (10)

1. banding self-ejection type intervention apparatus conveying system, comprise interior pipe, handle connector, middle pipe, side pipe, locating part, support, conical head, pull bar, binding wire, it is characterized in that, interior pipe box is in middle pipe, whole interior pipe passes middle pipe, interior pipe far-end is connected with conical head, the near-end of middle pipe links to each other with handle connector, its far-end is equipped with locating part, and side pipe and middle pipe are parallel to be provided with, and side pipe is near, far-end is the same with middle pipe, link to each other with locating part with handle connector respectively, one end of binding wire is fixed on the middle pipe of locating part back, and the other end colligation of binding wire is on pull bar, and support is bundled on the interior pipe between conical head and the locating part by binding wire, the conical head inner chamber communicates with interior tube cavity, pull bar passes from side pipe, passes locating part again, binding wire inserts in the conical head at last.

2. banding self-ejection type intervention apparatus conveying system according to claim 1, it is characterized in that, the first fixedly colligation of described binding wire one end is on the middle pipe of locating part back, begin to carry out colligation round pull bar from mount proximal end, binding wire twines along the support periphery, walk around pull bar behind the chance pull bar and turn back direction outside support, around support reverse reflex on the pull bar again around to pull bar the time, again around to pull bar, until the good support of colligation, the other end colligation of binding wire is tied a knot on pull bar by that analogy.

3. banding self-ejection type intervention apparatus conveying system according to claim 2 is characterized in that, the standoff distance uniformity of described binding wire on the support.

4. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, the external diameter of described conical head is greater than the size of colligation after-poppet, and its front end is tapered, and its rear end is fine taper or circular arc.

5. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, described pull bar is an one metal wire, and its far-end inserts in the side opening of conical head, and the near-end of pull bar is a ring tab shape.

6. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, described locating part, and it is the column cavity near support one end, mount proximal end is inserted in this column cavity.

7. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, described handle connector side is provided with tube for transfusion and pipe joint communicates with the slit that middle pipe reaches between the interior pipe, is used for injection of contrast medium or medicine.

8. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, described middle pipe and side pipe are the plastic tube of a two-chamber, logical respectively interior pipe and pull bar.

9. banding self-ejection type intervention apparatus conveying system according to claim 1 is characterized in that, described middle pipe and side pipe are two independently plastic tubes, middle Guan Weiyi double lumen tube, pipe in wherein a chamber leads to, another chamber conveying contrast solution; Side pipe is a single lumen catheter, and its inner chamber leads to pull bar.

10. banding self-ejection type intervention apparatus conveying system according to claim 1, it is characterized in that, pipe and side pipe are the plastic tube in one three chamber in described, manage in leading to respectively, carry contrast solution and pull bar, and the plastic tube two ends are connected with locating part with handle connector respectively.

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