CN204562262U - Medical stapler - Google Patents

Abstract

This utility model discloses a kind of Medical stapler, comprise ejector pin bar and be removably connected to the knife rest of ejector pin bar far-end, the near-end of knife rest is provided with the first grab and the second grab that extend roughly toward each other, and ejector pin bar is provided with first junction surface corresponding with the first grab and the second grab and the second junction surface; Wherein, the distance between two tangent lines that the distance on knife rest bearing of trend respectively and between tangent two tangent lines of the outer rim of the inner edge of the first grab and the second grab to be less than on ejector pin bar remote extension direction respectively and the inner edge at the first junction surface and the second junction surface is tangent.By above-mentioned structure, when anastomat uses, ejector pin bar can keep the traction of cutter setting frame in indentation process, and simple and reliable for structure, and the use sense promoting anastomat is subject to.

Description

Medical Stapler

technical field

The utility model belongs to the technical field of medical equipment manufacturing, in particular to a medical stapler.

Background technique

Stapler is a medical device that is often used in surgical operations on physiological tissues such as the intestinal tract. It is a medical device that replaces traditional manual suturing. Due to the development of modern technology and the improvement of manufacturing technology, it is currently used clinically. The stapler is reliable in quality, easy to use, tight and suitable for tightness, especially its fast suturing, easy operation, and few side effects and surgical complications. Favored and respected by clinical surgeons.

Usually, this type of stapler includes an anvil assembly and a staple cartridge assembly, and the staple cartridge assembly includes staples and a knife frame with a cutter to realize cutting and suturing of human physiological tissues; After cutting and suturing, before withdrawing the stapler from the surgical site, return the knife frame with the cutter to the staple cartridge to ensure that the cutter is not exposed outside the staple cartridge, so as not to cause damage to the surrounding tissue when the stapler is withdrawn. harm.

Contents of the invention

The purpose of the utility model is to provide a medical stapler with simple structure and reliable performance.

In order to achieve the purpose of the above-mentioned utility model, the utility model provides a medical stapler, which includes a pusher rod and a knife holder detachably connected to the distal end of the pusher rod, and the proximal end of the knife holder is provided with a substantially mutually extending The first hook and the second hook, the push rod is provided with a first engaging portion and a second engaging portion corresponding to the first hook and the second hook; wherein, when the knife rest extends The distance between the two tangents that are respectively tangent to the inner edge of the first hook and the inner edge of the second hook in the direction is less than the distance between the first and second hooks in the extending direction of the distal end of the push rod. The distance between two tangents tangent to the outer edge of the first joint and the second junction.

As a further improvement of the present utility model, the first engaging portion and the second engaging portion respectively protrude from two opposite surfaces of the distal end of the pusher rod.

As a further improvement of the present utility model, the first joint part and the second joint part are cylindrical bumps.

As a further improvement of the utility model, the first engaging portion and the second engaging portion are integrally formed with the pusher rod.

As a further improvement of the present invention, the first joint part and the second joint part are stamped and formed.

As a further improvement of the present utility model, the distance between two tangents that are respectively tangent to the inner edge of the first hook and the inner edge of the second hook in the extension direction of the tool holder is equal to that of the push nail The thickness of the distal portion of the rod.

As a further improvement of the present utility model, the surfaces on which the pusher rod and the tool holder act are arranged in an arc shape that fits with each other.

As a further improvement of the present utility model, the first hook and the second hook respectively include a base and a clamping portion bent and extended from the base, and the base is provided with a Angled leading surface.

As a further improvement of the utility model, the inner surface of the holding part is parallel to the proximal surface of the tool holder.

As a further improvement of the present utility model, the first hook and the second hook are respectively arranged at two opposite ends of the proximal surface of the knife holder.

Compared with the prior art, the medical stapler provided by the utility model is determined by the distance between two tangents which are respectively tangent to the inner edge of the first hook and the inner edge of the second hook in the extension direction of the knife holder. It is set to be less than the distance between two tangents that are respectively tangent to the outer edges of the first engaging portion and the second engaging portion in the extending direction of the distal end of the pusher rod, so that the first engaging portion and the second engaging portion can be correspondingly locked. It is held in the first hook and the second hook to ensure that when the stapler is in use, the push rod can maintain traction on the knife holder during the retraction process, so that the cutter can be smoothly returned to the staple bin, and the structure is simple and reliable.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of a medical stapler of the present invention;

Fig. 2 is a schematic diagram of the exploded structure of the cooperation between the staple cartridge assembly and the anvil assembly in an embodiment of the medical stapler of the present invention;

Fig. 3 is a schematic diagram of an explosion structure of an embodiment of the medical stapler of the present invention;

Fig. 4 is a schematic structural view of the knife holder in an embodiment of the medical stapler of the present invention;

Fig. 5 is a partial structural diagram of the pusher rod in an embodiment of the medical stapler of the present invention;

Fig. 6 is a structural schematic view of another perspective of the knife holder in an embodiment of the medical stapler of the present invention;

Fig. 7 is a schematic cross-sectional view of the connecting part between the pusher rod and the knife holder in an embodiment of the medical stapler of the present invention;

Fig. 8 is a schematic diagram of part of the structure of the pusher rod in an alternative embodiment of the medical stapler of the present invention;

Fig. 9 is a partial structural schematic diagram of the pusher rod in another alternative embodiment of the medical stapler of the present invention;

FIG. 10 is an enlarged schematic view of the structure within the frame line in FIG. 4 .

Detailed ways

The utility model will be described in detail below in conjunction with the specific embodiments shown in the accompanying drawings. However, these embodiments do not limit the present utility model, and the structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the protection scope of the present utility model.

In order to clearly express the positions and directions described in this application, the operator of the instrument is used as a reference, the end close to the operator is the proximal end, and the end far away from the operator is the distal end. At the same time, in this application, the bottom of the stapler is defined as the direction in which the grip handle extends from the housing, and the bottom is defined as the top of the stapler.

And, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from one another. For example, the first hook may be called the second hook, and similarly the second hook may also be called the first hook, which does not depart from the protection scope of the present application.

As shown in FIG. 1 , in one embodiment of the present invention, a stapler 100 includes a housing 10 , a support structure 20 protruding from the housing 10 to the distal end, and an anvil 30 connected to the distal end of the support structure 20 . The nail anvil 30 can be fixedly connected with the support structure 20 , and its cross section is arc-shaped, and a handle 40 is formed under the proximal end of the housing 10 .

Stapler 100 also includes cartridge assembly 32 and anvil assembly 34 . In this embodiment, the staple cartridge assembly 32 and the nail anvil assembly 34 are detachably installed on the nail anvil block 30, and match the shape of the nail anvil block 30, that is, the transverse direction of the nail cartridge assembly 32 and the nail anvil assembly 34. The cross-sections are also all set in an arc shape, so that physiological tissues can be anastomosed in a smaller operable space.

As shown in FIG. 2 , the staple cartridge assembly 32 has a staple cartridge 322, which includes a staple cartridge surface (not shown), and one or more rows of staple receiving slots (not shown) are arranged in a staggered manner on the staple cartridge surface. ), the staple cartridge assembly 32 also includes a nail pusher 324 and a cutter assembly disposed in the staple cartridge 322 . The staple pushing piece 324 can push the staples out of the staple receiving slots. The cutter assembly includes a knife frame 326 and a knife 328 mounted on the distal end of the knife frame 326 . The staple cartridge assembly 32 is also equipped with a staple cartridge cover 329 for blocking the staples in the staple cartridge 32 and the cutter 328 to prevent missed staples and false firing.

A knife groove 3242 adapted to the cutter 328 is respectively provided on the surface of the staple cartridge and the nail pusher 324 to support the firing operation of the cutter 328 . In this embodiment, the staple receiving grooves are located on both sides of the knife groove 3242, so that during the process of cutting and suturing the tissue, the two ends of the separated tissue can be sutured at the same time.

With reference to Fig. 2 and Fig. 3, in one embodiment of the present invention, the distal end of the nail cartridge assembly 32 is also connected with a nail anvil assembly 34, and the nail anvil assembly 34 includes a nail anvil 342 and a knife anvil 344. The anvil 342 and knife anvil 344 are matably mounted on the anvil 30 while the cartridge assembly 32 is mounted on the anvil 30 .

The supporting structure 20 comprises a pair of left side and right side brackets 22,24 which are arranged oppositely, and the far ends of the left side and the right side brackets 22,24 are respectively provided with the pin hole on the nail anvil 30 and the preset hole on it. The mounting holes 222 and 242 are matched with the protrusions 302 to realize the mutual fixing of the anvil 30 and the supporting structure 20 .

The proximal end of the support structure 20 is connected to the casing 10, and the casing 10 accordingly includes a left half-shell 12 and a right half-shell 14 for correspondingly connecting the left and right brackets 22, 24, respectively.

The stapler 100 also includes a firing assembly 50, the firing assembly 50 includes a firing handle 52 located at the proximal end of the stapler 100, a staple cartridge push rod 54 driven by the firing handle 52, and a transmission member connecting the firing handle 52 and the staple cartridge push rod 54 . The staple cartridge push rod 54 can drive the staple cartridge assembly 32 to move from the proximal end to the distal end of the stapler 100 under the action of the firing handle 52 to approach the staple anvil assembly 34, and finally close the stapler 100. At this moment, if there is physiological tissue placed between the staple cartridge assembly 32 and the nail anvil assembly 34, the staple cartridge push rod 54 can drive the staple cartridge assembly 32 close to the nail anvil assembly 34 to clamp the physiological tissue.

In one embodiment of the present invention, the transmission member includes a front link 562 and a rear link 564 . The distal end of the front link 562 is pivotally connected to the nail bin push rod 54 through a front link pin (not shown), and the near end of the front link 562 is connected to the far end of the rear link 564 through a rear link pin (not shown). shown), the proximal end of the rear link 564 is connected to the support structure 20.

Continuing to cooperate with reference to FIG. 3 , the stapler 100 also includes an anti-overflow needle assembly, which includes an anti-overflow needle push rod 62, a transmission push rod 64 connected to the anti-overflow needle push rod 62, and the The anti-overflow needle 61 in the assembly 32 (shown in FIG. 2 ), the anti-overflow needle 61 is connected with the driving push rod 64 in a linked manner.

In one embodiment of the present utility model, the anti-overflow needle push rod 62 is set in a saddle shape, and a symmetrical operating part is provided at the proximal end thereof, and the operating part protrudes from the casing 10 and is set.

The anti-overflow needle assembly also includes a rotating crank 66 that cooperates with the anti-overflow needle push rod 62 . The turning crank 66 is pivotally connected to the bracket 20 and is movably connected to the staple cartridge push rod 54 at the same time. Through the operation part of the anti-overflow needle push rod 62, the anti-overflow needle push rod 62 can be pushed from the proximal end to the distal end of the stapler 100, and at the same time, when the anti-overflow needle push rod 62 is advanced, the transmission push rod 64 will also be linked Move to the distal end, thereby pushing the anti-overflow needle 61 to move toward the distal end of the stapler in association.

The operation process of the stapler 100 in one embodiment of the present invention when clamping physiological tissues is as follows:

In the initial state of the stapler 100, the front connecting rod 562 and the rear connecting rod 564 are arranged at an angle less than 180 degrees, and the connecting part of the front connecting rod 562 and the rear connecting rod 564 is against a side on the firing handle 52. Support part 522 .

When the physiological tissue needs to be clamped, the physiological tissue can be placed between the anvil surface of the nail anvil assembly 34 and the nail cartridge surface of the nail cartridge assembly 32, and then push the anti-overflow needle push rod 62 to move toward the distal end of the stapler , so that the linkage push rod 64 and the anti-overflow needle 61 move toward the far end of the stapler, so that the anti-overflow needle 61 protrudes from the staple bin assembly 32, and finally connects with the receiving portion (not marked) provided on the anvil assembly 34 ) to close the opening between the anvil assembly 34 and the staple cartridge assembly 32, that is, to close the opening of the anvil block 30.

Then, the firing handle 52 is driven to rotate pivotally toward the grip handle 40. At this time, the support portion 522 will bear against the connecting portion of the front link 562 and the rear link 564, so that the front link 562 and the rear link 564 are forced to The ground relatively pivots and moves toward a state that tends to increase the angle between them.

In one embodiment of the present utility model, the front connecting rod 562 and the rear connecting rod 564 can be driven by the support part 522 to a relatively stable mating state where the clamping angle is slightly greater than 180 degrees, and finally abut against the supporting structure 20 224, at this time the front link 562 and the rear link 564 move to the interference state.

During this process, the distance defined between the distal end of the front link 562 and the proximal end of the rear link 564 gradually increases to a maximum distance and then decreases slightly, since the proximal end of the rear link 564 is fixed to the support structure 20, the distal end of the front connecting rod 562 drives the staple cartridge push rod 54 to move toward the distal end of the stapler, and the driving force of the staple cartridge push rod 54 acting on the staple cartridge assembly 32 makes the staple cartridge assembly 32 forced to move toward the stapler. Anvil assembly 34 is approached, thereby clamping physiological tissue.

In one embodiment of the present invention, the firing assembly 50 further includes a nail pusher 58, which is slidably fitted in the nail cartridge pusher 54, and the knife rest 326 is detachably connected to the distal end of the nail pusher 58. The surfaces on which the push rod 58 interacts with the knife rest 326 are shaped to fit each other.

In this embodiment, the surfaces on which the nail pusher rod 58 and the tool holder 326 act are configured in an arc shape that fits with each other.

4 to 7, the proximal end of the tool holder 326 is provided with a first hook 3262 and a second hook 3264 extending approximately toward each other, and the push rod 58 is provided with the first hook 3262 and the second hook. 3264 corresponds to the first engaging portion 582 and the second engaging portion 584 . Wherein, the distance D1 between the two tangents that are respectively tangent to the inner edge of the first hook 3262 and the inner edge of the second hook 3264 on the extension direction L1 of the tool holder 326 is smaller than that in the extension direction of the distal end of the push rod 58 The distance D2 between two tangents on L2 that are respectively tangent to the outer edges of the first joint portion 582 and the second joint portion 584 . In this way, during the passive retraction process of the nail pusher rod 58, the first engaging portion 582 and the second engaging portion 584 on it can ensure the holding effect with the first hook 3262 and the second grab 3264, avoiding contact with the knife. The frame 326 is disengaged; and, since the first grab 3262 and the second grab 3264 are set to extend toward each other, it can prevent the screw push rod 58 from colliding with the knife rest due to shaking or displacement in the left and right directions during the movement process. 326's disengagement.

The first hook 3262 and the second hook 3264 are respectively disposed on two opposite ends of the proximal surface 3266 of the knife holder 326 .

The first engaging portion 582 and the second engaging portion 584 respectively protrude from two opposite surfaces of the distal end of the push rod 58. As a preferred embodiment, in this embodiment, the first engaging portion 582 and the second engaging portion 584 are Cylindrical bumps. The first engaging portion 582 and the second engaging portion 584 arranged in the shape of cylindrical protrusions can play a better guiding role when mated to the first hook 3262 and the second hook 3264 .

Referring to Fig. 8, in an exemplary alternative, the first engaging portion 582a and the second engaging portion 584a can also directly limit the distal end of the pusher rod 58, that is, the distal end of the pusher rod 58 can be relative to The active end 581a of the pusher rod 58 has a greater thickness.

Referring to FIG. 9 , in yet another exemplary alternative embodiment, the first joint portion 582b and the second joint portion 584b may also be square protrusions disposed on two opposite surfaces of the distal end of the push rod 58 .

All the above alternative implementations should be considered within the protection scope of the present utility model.

In this embodiment, the first engaging portion 582 and the second engaging portion 584 are integrally formed with the push rod 58 , and, preferably, the first engaging portion 582 and the second engaging portion 584 are formed by stamping.

As a preferred embodiment, the distance D2 between the two tangent lines that are respectively tangent to the inner edge of the first hook 3262 and the inner edge of the second hook 3264 in the extending direction L1 of the tool holder 326 is equal to the distance of the push rod 58 The thickness of the end portion 581. That is, after the knife rest 326 is assembled and connected with the pusher rod 58, the surface of the distal part 581 of the pusher rod 58 is attached between the inner edges of the first hook 3262 and the second hook 3264, ensuring that the pusher rod 58 and the inner edge of the second grabber 3264 Tool holder 326 for a more stable fit.

Referring to FIG. 10 , taking the illustrated second hook 3264 as an example, the first hook 3262 and the second hook 3264 respectively include a base 32642 and a clamping portion 32644 bent and extended from the base 32642 , and the base 32642 is provided with a The guide surface 32641 forming a certain angle with the assembly direction of the knife holder 326 is used to better guide the assembly of the knife holder 326 to the first engaging portion 582 and the second engaging portion 584 at the distal end of the push rod 58 . Preferably, the inner side surface 32643 of the clamping portion 32644 is parallel to the proximal surface 3266 of the tool holder 326, so as to ensure that the first engaging portion 582 and the second engaging portion 584 on the push rod 58 are compatible with the corresponding first hook 3262 and The reliability of the cooperation of the second hook 3264. .

A wedge-shaped piece 524 is connected to the firing handle 52 , and the wedge-shaped piece 524 can be at least partially assembled in the staple cartridge push rod 54 to interact with the staple push rod 58 .

The operating process of the stapler 100 in an embodiment of the present invention when cutting and suturing physiological tissues is as follows:

After the above operation of clamping the physiological tissue is completed, the firing handle 52 is driven by the handle return spring (not shown) to rotate in a direction away from the handle 40 to automatically reset the firing handle 52 .

During this process, the wedge-shaped piece 524 on the firing handle 52 is triggered to resist on the push rod 58. At this time, by pivoting the firing handle 52 toward the direction of holding the handle 40, the wedge-shaped piece 524 pushes the pushing rod 58. Nail rod 58 moves toward the distal end of the stapler, so as to realize simultaneous firing of cutter 328 and staple pusher 324, and staple pusher 324 pushes the staples in the staple holding groove to be fastened on the physiological tissue, and simultaneously the cutter 328 cuts corresponding physiological tissues.

The proximal end of the nail push rod 58 has a buckling portion 585 extending out of the staple cartridge push rod 54, and the firing assembly also includes a reset elastic element 59 connected between the buckle portion 585 and the supporting structure 20. In a novel embodiment, the reset elastic element 59 is a tension spring.

When the push rod 58 is fired, the reset elastic element 59 is in a stretched state, and when the stapler is in the fired state, that is, after the physiological tissue has been cut and sutured, the reset elastic element 59 is under the action of its own tension. Pull back the push rod 58, and at the same time, pull back the knife rest 326 provided with the cutting knife 328. In this way, the stapler completes the entire firing process and reaches the firing completion state.

After the stapler reaches the firing completion state, the closed staple cartridge assembly 32 and the staple anvil assembly 34 can be opened by pressing the release button 70 .

In one embodiment of the present invention, the release button 70 is movably connected to the support structure 20 through a release button pin 702, and the proximal end of the rear link 564 can also be connected to the support structure 20 through the connection with the release button pin 702. 20 is relatively fixed.

The far end of the release button 70 has an abutment end 704 that can act on the rear link 564. When the release button 70 is pressed, the abutment end 704 will drive the front link 562 and the rear link 564 towards the angle formed less than 180 degrees. state movement, that is, the connecting part of the front link 562 and the rear link 564 moves to the bottom of the stapler, so as to destroy the relatively stable mating state between the front link 562 and the rear link 564, and then push the staple cartridge. The rod 54 and cartridge assembly 32 are pulled back relatively proximally, thereby removing the instrument from the surgical site.

Of course, if the stapler 100 needs to be used again, a new staple cartridge assembly 32 and/or anvil assembly 34 can be replaced, so as to perform the next cutting and suturing.

The medical stapler 100 provided by the utility model is set by setting the distance D1 between the two tangent lines which are respectively tangent to the inner edge of the first hook 3262 and the inner edge of the second hook 3264 in the extension direction L1 of the knife rest 326 be less than the distance D2 between the two tangents that are tangent to the outer edges of the first engaging portion 582 and the second engaging portion 584 on the extending direction L2 of the distal end of the push rod 581, so that the first engaging portion 582 and the second engaging portion 582 The engaging part 584 can be correspondingly held in the first hook 3262 and the second hook 3264, so that when the stapler 100 is in use, the push rod 58 can keep the traction on the knife rest 326 during the retraction process, so that the knife rest The 326 can return to the initial position after the stapler 100 is fired, and the structure is simple, which improves the safety and user experience of the stapler.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for the feasible implementation modes of the present utility model, and they are not used to limit the protection scope of the present utility model. Embodiments or modifications should be included within the protection scope of the present utility model.

Claims (10)

1. a Medical stapler, comprise ejector pin bar and be removably connected to the knife rest of ejector pin bar far-end, it is characterized in that, the near-end of described knife rest is provided with the first grab and the second grab that extend roughly toward each other, described ejector pin bar is provided with first junction surface corresponding with described first grab and the second grab and the second junction surface; Wherein, the distance between two tangent lines that the distance on described knife rest bearing of trend respectively and between tangent two tangent lines in the inner edge of described first grab and the inner edge of the second grab to be less than on described ejector pin bar remote extension direction respectively and the outer rim at described first junction surface and the second junction surface is tangent.

2. Medical stapler according to claim 1, is characterized in that, described first junction surface and the second junction surface protrude from two apparent surfaces of described ejector pin bar far-end respectively.

3. Medical stapler according to claim 2, is characterized in that, described first junction surface and the second junction surface are cylinder projection.

4. Medical stapler according to claim 2, is characterized in that, described first junction surface and the second junction surface and described ejector pin bar one-body molded.

5. Medical stapler according to claim 2, is characterized in that, described first junction surface and the second junction surface punch forming.

6. according to the Medical stapler that claim 2 is stated, it is characterized in that, the distance on described knife rest bearing of trend respectively and between tangent two tangent lines in the inner edge of described first grab and the inner edge of the second grab equals the thickness of described ejector pin bar distal portions.

7. Medical stapler according to claim 1, is characterized in that, the surface of described ejector pin bar and described knife rest effect is set to the arc shape fitted each other.

8. Medical stapler according to claim 1, it is characterized in that, the holding section that described first grab and the second grab comprise base portion respectively and extend from described base portion bending, described base portion is provided with the guiding face in a certain angle with described knife rest assembly direction.

9. Medical stapler according to claim 8, is characterized in that, the inner surface of described holding section is parallel with the proximal end face of described knife rest.

10. Medical stapler according to claim 1, is characterized in that, described first grab and the second grab are divided into two opposite ends of the proximal end face of described knife rest.