CN220833088U - Anastomat cutting knife and anastomat - Google Patents

Abstract

The utility model relates to a cutter of an anastomat. The tissue cutter comprises an upper wing, a lower wing and a cutter body positioned between the upper wing and the lower wing, wherein the distal end of the cutter body is provided with a cutting edge for cutting tissues, the upper wing comprises two upper wing parts which are arranged in a front-back symmetrical way, the lower end face of the upper wing part comprises a first plane section, a second plane section and a first concave area which is formed between the first plane section and the second plane section and is concave upwards, and the first plane section and the second plane section are positioned on the same plane and are vertical to the upper-lower direction; the lower wing comprises two lower wing parts which are symmetrically arranged front and back, the upper end face of the lower wing part comprises a third plane section, a fourth plane section and a second concave area which is formed between the third plane section and the fourth plane section and is concave downwards, and the third plane section and the fourth plane section are positioned on the same plane and are vertical to the up-down direction; the upper part and the lower part of the front side surface and the rear side surface of the cutter body are respectively provided with a first groove and a second groove. The resistance of the anastomat cutting knife in the moving process is small.

Description

Anastomat cutting knife and anastomat

Technical Field

The utility model relates to the field of medical instruments, in particular to a cutter knife of an anastomat and the anastomat.

Background

Anastomat has been widely used in various open or endoscopic procedures, which enable clamping fixation or cutting of tissue. The anastomat comprises a clamping mechanism, a cutting knife and a closing device. The clamping mechanism comprises a nail bin and a nail propping seat which are arranged at an included angle, wherein both the nail bin and the nail propping seat are provided with sliding grooves extending along the length direction of the clamping mechanism, and tissues to be clamped and fixed or cut can be placed between the nail bin and the nail propping seat. When the anastomat is used, an operator operates the closing device, and drives the cutting knife to slide along the sliding grooves arranged on the nail bin and the nail supporting seat through the closing device, so that the free ends of the nail bin and the nail supporting seat are gradually folded or unfolded. In the sliding process, the friction resistance between the cutting knife and the front end clamping tool is large, so that the cutting knife is not pushed smoothly, the anastomat is easy to break down in the operation process, and normal cutting anastomosis cannot be effectively implemented.

Currently, in order to reduce the friction resistance between the cutter and the front end clamping tool, researchers have embedded a layer of lubricating material on the contact surfaces of the cutter with the nail cartridge and the nail supporting seat, and the manufacturing cost is relatively high in this way, and the process is relatively complex. Patent CN 211094394U discloses a cutting knife, and its nail storehouse is provided with the arc recess on the side end face that the nail seat deviates from mutually, and the wing portion of cutting knife is provided with the arc arch, through the cooperation of arc recess and arch, has reduced the cutting knife and nail storehouse and support the area of contact between the nail seat to reduced frictional resistance, improved the smoothness in the cutting knife promotion process, the cutting knife of this kind of mode needs special nail storehouse and supports the nail seat, and the universality is not high.

Disclosure of Invention

The utility model aims to provide a novel anastomat cutting knife which has small resistance in the moving process.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

The cutter comprises an upper wing, a lower wing and a cutter body positioned between the upper wing and the lower wing, wherein the distal end of the cutter body is provided with a cutting edge for cutting tissues, the upper wing comprises two upper wing parts which are symmetrically arranged front and back, the lower end face of the upper wing part comprises a first plane section, a second plane section and a first concave area which is formed between the first plane section and the second plane section and is concave upwards, and the first plane section and the second plane section are positioned on the same plane and are perpendicular to the upper and lower directions;

The lower wing comprises two lower wing parts which are symmetrically arranged front and back, the upper end face of the lower wing part comprises a third plane section, a fourth plane section and a second concave area which is formed between the third plane section and the fourth plane section and is concave downwards, and the third plane section and the fourth plane section are positioned on the same plane and are vertical to the up-down direction;

The upper part and the lower part of the front side surface and the rear side surface of the cutter body are respectively provided with a first groove and a second groove.

Preferably, the first groove is located in a middle region of an upper portion of the front side or the rear side of the cutter body, and the second groove is located in a middle region of a lower portion of the front side or the rear side of the cutter body.

Preferably, the distance from the distal end to the proximal end of the first groove is L ₁, and the distance from the distal end to the proximal end of the upper part of the front side or the rear side of the cutter body is L _a, wherein 1/3L _a＜L₁＜2/3L_a.

Preferably, the distance from the distal end to the proximal end of the second groove is L ₂, and the distance from the distal end to the proximal end of the lower part of the front side or the rear side of the cutter body is L _b, wherein 1/2L _b＜L₂＜4/5L_b.

In some preferred embodiments, the first groove and the second groove are kidney grooves.

Preferably, the front and rear sides of the cutter body are planar and extend in the proximal-distal direction.

Preferably, the sum of the distance of the first planar segment from its distal end to its proximal end and the distance of the second planar segment from its distal end to its proximal end is smaller than the distance of the first recessed area from its distal end to its proximal end.

Preferably, the sum of the distance of the third planar segment from its distal end to its proximal end and the distance of the fourth planar segment from its distal end to its proximal end is smaller than the distance of the second recessed area from its distal end to its proximal end.

Preferably, the lower end face of the upper wing part further comprises a first inclined surface section which is positioned at the far end of the first plane section and is inclined upwards, and a transitional cambered surface is connected between the far end of the first inclined surface section and the first plane section.

Preferably, the upper end face of the lower wing part further comprises a second inclined surface section which is positioned at the far end of the third plane section and is inclined downwards, and a transitional cambered surface is connected between the far end of the second inclined surface section and the third plane section.

Preferably, the first concave region comprises a first plane region parallel to the first plane section, and a first transition region and a second transition region respectively connected with the first plane section and the second plane section, wherein the first transition region is composed of a downward arched cambered surface and an upward arched cambered surface, the downward arched cambered surface of the first transition region is connected to the first plane section, the second transition region is composed of an upward arched cambered surface and a downward arched cambered surface, and the downward arched cambered surface of the second transition region is connected to the second plane section.

Preferably, the second concave region comprises a second plane region parallel to the third plane section, and a third transition region and a fourth transition region respectively connected with the third plane section and the fourth plane section, wherein the third transition region is composed of an upwardly arched cambered surface and a downwardly arched cambered surface, the third transition region is connected to the third plane section, the fourth transition region is composed of a downwardly arched cambered surface and an upwardly arched cambered surface, and the upwardly arched cambered surface of the fourth transition region is connected to the fourth plane section.

Preferably, the lower end surface of the upper wing part further comprises a second plane transition section connected to the proximal end of the second plane section, and the second plane transition section is an arc surface;

the upper end face of the lower wing part further comprises a fourth plane transition section connected to the proximal end of the fourth plane section, and the fourth plane transition section is an arc surface.

A second object of the present utility model is to provide a stapler comprising a stapler cutting blade as described above.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

According to the utility model, through the design of the first concave area and the second concave area, the contact area between the cutting knife and the upper end surface of the nail pushing seat and the lower end surface of the nail bin is reduced, and through the design of the first groove and the second groove, the contact area between the cutting knife and the nail pushing seat pushing groove and the contact area between the cutting knife and the nail bin pushing groove are reduced, so that the friction resistance in the movement process of the cutting knife is reduced, and the smoothness of the movement of the cutting knife is improved; meanwhile, through the design of the first to fourth plane sections, the cutting knife is contacted with the upper end face of the nail propping seat and the lower end face of the nail bin so as to gradually fold or open the distal ends of the nail bin and the nail propping seat.

Drawings

FIG. 1 is a schematic view of a cutter of a stapler according to an embodiment;

FIG. 2 is a schematic view of another angle configuration of a stapler cutter according to an embodiment;

FIG. 3 is an enlarged schematic view of the portion A in FIG. 2;

FIG. 4 is a schematic view of the cutter of the stapler according to the embodiment;

FIG. 5 is a left side view of a stapler cutter blade in an embodiment;

FIG. 6 is a schematic view of the cartridge assembly of the embodiment in a closed configuration;

FIG. 7 is a schematic view of the cartridge assembly in an open configuration;

Wherein: 1. an upper wing; 11. a first recessed region; 111. a first planar region; 112. a first transition region; 113. a second transition region; 12. a first planar segment; 13. a second planar segment; 14. a first ramp section; 15. a second planar transition section;

2. A lower wing; 21. a second recessed region; 211. a second planar region; 212. a third transition region; 213. a fourth transition region; 22. a third planar segment; 23. a fourth planar segment; 24. a second ramp section; 25. a fourth planar transition section;

3. A knife body; 31. a blade; 32. a first groove; 33. a second groove;

4. Pushing the blade;

5. a nail supporting seat;

6. A staple cartridge;

7. a housing;

x, far and near directions, y, front and back directions; z, up and down direction.

Detailed Description

The utility model will be further described with reference to examples of embodiments shown in the drawings.

Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present utility model. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.

In describing embodiments of the present utility model, it should be understood that the terms "distal," "proximal," and the like are used to define an orientation or positional relationship in terms of the orientation of the stapler when in use, wherein the side proximal to the operator is the proximal end and the side distal to the operator is the distal end. It is merely for convenience in describing and simplifying the description of embodiments of the present utility model and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the embodiments of the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

In embodiments of the utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the utility model. In order to simplify the disclosure of embodiments of the present utility model, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present utility model. Furthermore, embodiments of the present utility model may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.

Example 1

The stapler includes an instrument platform (not shown), a handle (not shown) movably coupled to the instrument platform, and a cartridge assembly removably coupled to a distal end of the instrument platform, wherein the cartridge assembly is shown in fig. 6 and 7. The instrument platform and the handle can adopt structures commonly used in the prior art, and are not described in detail in the application.

The cartridge assembly includes a housing 7, a push-knife assembly, and a pair of clamping members. The pair of clamping members, namely the cartridge 6 and the abutment 5, have a closed condition (as shown in fig. 6) capable of closing relative to each other to sandwich the tissue to be cut, and an open condition (as shown in fig. 7) capable of opening relative to each other. Specifically, the nail propping seat 5 is fixedly installed at the distal end of the casing 7, the nail bin 6 is rotatably arranged at the distal end of the casing 7, and the specific structures of the nail propping seat 5 and the nail bin 6 refer to the prior art, so that the application is not particularly limited. Push broach grooves (not shown in the figure) with guiding function are respectively formed on the nail pushing seat 5 and the nail bin 6, and the push broach grooves of the nail pushing seat 5 and the push broach grooves of the nail bin 6 extend along the length direction of the nail pushing seat 5 and the length direction of the nail bin 6 respectively.

Referring to fig. 1 and 2, the push knife assembly includes a push blade 4 and a cutting knife. The push blade 4 is arranged inside the housing 7 and is axially movable along the housing 7, the push blade 4 being operatively connected to an actuation source, such as a handle of a stapler; the cutting knife is fixedly connected or formed at the far end of the push knife rod, and can slide along the far and near direction x under the action of the push knife blade 4.

Referring to fig. 3 to 5, the cutter includes an upper wing 1, a lower wing 2, and a cutter body 3. The distal end of the knife body 3 is provided with a knife edge 31 for cutting tissues, the knife edge 31 is fixedly arranged or formed on the knife body 3, and the upper end and the lower end of the knife body 3 respectively penetrate through a knife pushing groove of the nail pushing seat 5 and a knife pushing groove of the nail bin 6 and are connected to the upper wing 1 and the lower wing 2. The upper wing 1 is matched with the upper end face of the nail supporting seat 5, the lower wing 2 is matched with the lower end face of the nail cabin 6, the lower wing 2 can drive the nail cabin 6 to rotate in the process that the cutting knife is driven by the pushing blade 4 to move towards the far end, so that the nail cabin component is closed to clamp target tissues, and when the nail cabin component is in a closed state, the cutting knife can move towards the far end to cut the tissues.

In order to reduce the friction resistance between the cutter and the nail propping seat 5 and between the cutter and the nail bin 6, the inventor respectively sets a concave area and a plane section on the lower end face of the upper wing 1 and the upper end face of the lower wing 2, and the plane section is contacted with the nail propping seat 5 or the nail bin 6 to gradually fold or open the distal end of the nail bin 6 and the nail propping seat 5, and the concave area is not contacted with the nail propping seat 5 or the nail bin 6, so that the contact area between the cutter and the nail propping seat 5 and the contact area between the cutter and the nail bin 6 are reduced, and the friction resistance in the movement process of the cutter is reduced.

Specifically, the upper wing 1 includes two upper wing portions symmetrically disposed in front and back, and taking one of the upper wing portions as an example, the lower end face of the upper wing portion includes a first planar section 12, a second planar section 13, and a first recessed area 11 formed between the first planar section 12 and the second planar section 13 and recessed upward, and the first planar section 12 and the second planar section 13 are located on the same plane and perpendicular to the up-down direction z. The lower wing 2 includes two lower wing parts symmetrically arranged in front and back, taking one lower wing part as an example, the upper end surface of the lower wing part includes a third plane section 22, a fourth plane section 23 and a second concave area 21 formed between the third plane section 22 and the fourth plane section 23 and concave downward, and the third plane section 22 and the fourth plane section 23 are located on the same plane and perpendicular to the up-down direction z. Further, the sum of the distance of the first planar segment 12 from its distal end to its proximal end and the distance of the second planar segment 13 from its distal end to its proximal end is smaller than the distance of the first recessed area 11 from its distal end to its proximal end. The sum of the distance of the third planar segment 22 from its distal end to its proximal end and the distance of the fourth planar segment 23 from its distal end to its proximal end is smaller than the distance of the second recessed area 21 from its distal end to its proximal end. By the design, the friction force of the cutting knife is smaller when the nail bin 6 and the nail supporting seat 5 are kept in a closed state or an open state.

The lower end surface of the upper wing part also comprises a first inclined surface section 14 which is positioned at the far end of the first plane section 12 and is inclined upwards, and a transitional cambered surface is connected between the far end of the first inclined surface section 14 and the first plane section 12; the upper end surface of the lower wing part also comprises a second inclined surface section 24 which is positioned at the far end of the third plane section 22 and is inclined downwards, and a transitional cambered surface is connected between the far end of the second inclined surface section 24 and the third plane section 22. The front end inclined plane and cambered surface transition structure is compared with a right-angle plane or an R-angle structure, when the jaw is closed, the resistance of the nail supporting seat 5 and the nail bin 6 to the cutting knife is smaller because of the inclined plane and cambered surface transition, the cutting knife can advance more smoothly, and the required firing force is smaller.

The first concave region 11 comprises a first plane region 111 parallel to the first plane section 12, and a first transition region 112 and a second transition region 113 respectively connecting the first plane section 12 and the second plane section 13, wherein the first transition region 112 is composed of a cambered surface which is arched downwards and a cambered surface which is arched upwards, and the cambered surface which is arched downwards of the first transition region 112 is connected to the first plane section 12; the second transition region 113 is formed by an upwardly arched surface and a downwardly arched surface, the downwardly arched surface of the second transition region 113 being connected to the second planar section 13. The second concave region 21 includes a second planar region 211 parallel to the third planar segment 22, and a third transition region 212 and a fourth transition region 213 respectively connecting the third planar segment 22 and the fourth planar segment 23, the third transition region 212 being formed of an upwardly arched surface and a downwardly arched surface, the third transition region 212 being connected to the third planar segment 22, the fourth transition region 213 being formed of a downwardly arched surface and an upwardly arched surface, the fourth transition region 213 being connected to the fourth planar segment 23. By the arrangement of the first to fourth transition regions 213, smoothness in movement of the cutter is improved.

Further, the lower end face of the upper wing part further comprises a second plane transition section 15 connected to the proximal end of the second plane section 13, the upper end face of the lower wing part further comprises a fourth plane transition section 25 connected to the proximal end of the fourth plane section 23, and the second plane transition section 15 and the fourth plane transition section 25 are cambered surfaces.

The inventor finds that during the movement of the cutter, the front side surface and the rear side surface of the cutter body 3 are contacted with the inner wall of the push-type cutter groove and generate friction resistance, and in order to further reduce the friction resistance, the inventor arranges grooves at the contact parts of the front side surface and the rear side surface of the cutter body 3 and the push-type cutter groove, so that the contact area between the cutter body and the push-type cutter groove is reduced.

Specifically, the front and rear sides of the cutter body 3 are planes, and the upper part and the lower part of the cutter body are respectively provided with a first groove 32 and a second groove 33, further, the first groove 32 is positioned in the middle area of the upper part of the front side or the rear side of the cutter body 3, and the second groove 33 is positioned in the middle area of the lower part of the front side or the rear side of the cutter body 3. The distance from the distal end to the proximal end of the first groove 32 is L ₁, and the distance from the distal end to the proximal end of the upper part of the front side or the rear side of the cutter body 3 is L _a, wherein 1/3L _a＜L₁＜2/3L_a; the distance from the distal end to the proximal end of the second groove 33 is L ₂, and the distance from the distal end to the proximal end of the lower portion of the front side or the rear side of the cutter body 3 is L _b, wherein 1/2L _b＜L₂＜4/5L_b. Through the design of L ₁、L_a、L₂ and L _b, the stability of the cutting knife is ensured, and meanwhile, the friction resistance between the cutting knife and the nail bin 6 and the nail supporting seat 5 is further reduced.

Preferably, the first groove 32 and the second groove 33 are kidney grooves. The structure is more convenient to process and saves cost.

The cutter has at least the following advantages:

(1) Through the design of the concave areas of the lower end surface of the upper wing part and the upper end surface of the lower wing part and the grooves of the front side surface and the rear side surface of the cutter body 3, the contact area between the cutter and the upper end surface of the nail supporting seat 5, the lower end surface of the nail cabin 6 and the inner wall of the push cutter groove is reduced, so that the friction resistance between the cutter and the nail cabin 6 and the friction resistance between the cutter and the nail supporting seat 5 are reduced, and the smoothness of the cutter movement is improved.

(2) Through the design of upper wing portion and lower wing portion front end inclined plane and cambered surface transition structure, compare in right angle plane or R angle structure, when closing the jaw, support nail seat 5 and nail storehouse 6 and give the resistance of cutting knife less, required percussion force is less.

(3) The cutting knife is convenient to process and saves cost.

The above embodiments are provided to illustrate the technical concept and features of the present utility model and are intended to enable those skilled in the art to understand the content of the present utility model and implement the same, and are not intended to limit the scope of the present utility model. All equivalent changes or modifications made in accordance with the spirit of the present utility model should be construed to be included in the scope of the present utility model.

Claims (10)

1. A cutter knife of anastomat, includes upper wing, lower wing and lies in the sword body between upper wing and the lower wing, the distal end of sword body has the cutting edge that is used for cutting tissue, its characterized in that: the upper wing comprises two upper wing parts which are symmetrically arranged in front and back, the lower end face of the upper wing part comprises a first plane section, a second plane section and a first concave area which is formed between the first plane section and the second plane section and is concave upwards, and the first plane section and the second plane section are positioned on the same plane and are vertical to the up-down direction; the lower wing comprises two lower wing parts which are symmetrically arranged front and back, the upper end face of the lower wing part comprises a third plane section, a fourth plane section and a second concave area which is formed between the third plane section and the fourth plane section and is concave downwards, and the third plane section and the fourth plane section are positioned on the same plane and are vertical to the up-down direction;

The upper part and the lower part of the front side surface and the rear side surface of the cutter body are respectively provided with a first groove and a second groove.

2. The stapler cutter blade of claim 1, wherein: the first groove is positioned in the middle area of the upper part of the front side surface or the rear side surface of the cutter body, and the second groove is positioned in the middle area of the lower part of the front side surface or the rear side surface of the cutter body.

3. The stapler cutter blade of claim 1, wherein: the distance from the distal end to the proximal end of the first groove is L ₁, and the distance from the distal end to the proximal end of the upper part of the front side or the rear side of the cutter body is L _a, wherein 1/3L _a＜L₁＜2/3L_a.

4. The stapler cutter blade of claim 1, wherein: the distance from the far end to the near end of the second groove is L ₂, and the distance from the far end to the near end of the lower part of the front side or the rear side of the cutter body is L _b, wherein 1/2L _b＜L₂＜4/5L_b.

5. The stapler cutter blade according to any one of claims 1-4, wherein: the first groove and the second groove are kidney-shaped grooves.

6. The stapler cutter blade of claim 1, wherein: the sum of the distance from the far end to the near end of the first plane section and the distance from the far end to the near end of the second plane section is smaller than the distance from the far end to the near end of the first concave area, and the sum of the distance from the far end to the near end of the third plane section and the distance from the far end to the near end of the fourth plane section is smaller than the distance from the far end to the near end of the second concave area.

7. The stapler cutter blade of claim 1, wherein: the lower end face of the upper wing part also comprises a first inclined surface section which is positioned at the far end of the first plane section and is inclined upwards, and a transitional cambered surface is connected between the far end of the first inclined surface section and the first plane section; and/or the number of the groups of groups,

The upper end face of the lower wing part further comprises a second inclined surface section which is positioned at the far end of the third plane section and is inclined downwards, and a transitional cambered surface is connected between the far end of the second inclined surface section and the third plane section.

8. The stapler cutter blade of claim 1, wherein: the first concave region comprises a first plane region parallel to the first plane section, and a first transition region and a second transition region which are respectively connected with the first plane section and the second plane section, wherein the first transition region is composed of a downward arched cambered surface and an upward arched cambered surface, the downward arched cambered surface of the first transition region is connected to the first plane section, the second transition region is composed of an upward arched cambered surface and a downward arched cambered surface, and the downward arched cambered surface of the second transition region is connected to the second plane section; and/or

The second concave region comprises a second plane region parallel to a third plane section, and a third transition region and a fourth transition region which are respectively connected with the third plane section and a fourth plane section, wherein the third transition region is composed of an upward arched cambered surface and a downward arched cambered surface, the third transition region is connected to the third plane section, the fourth transition region is composed of a downward arched cambered surface and an upward arched cambered surface, and the fourth transition region is connected to the fourth plane section.

9. The stapler cutter blade of claim 1, wherein: the lower end surface of the upper wing part also comprises a second plane transition section connected to the proximal end of the second plane section, and the second plane transition section is a cambered surface;

the upper end face of the lower wing part further comprises a fourth plane transition section connected to the proximal end of the fourth plane section, and the fourth plane transition section is an arc surface.

10. An anastomat is characterized in that: the stapler comprises a stapler cutting blade according to any one of claims 1 to 9.