US-12616466-B2 - Cartridge assembly, head assembly and surgical stapler

US12616466B2US 12616466 B2US12616466 B2US 12616466B2US-12616466-B2

Abstract

A cartridge assembly, a head assembly and a surgical stapler are provided. The cartridge assembly includes: a staple strip including at least one staple strip body and staples, wherein each staple is rotatably connected to the staple strip body via a connecting portion; and a cartridge cover jacketed on the staple strip body, wherein the cartridge cover includes at least one bending portion extending in an axial direction of the stapler, the bending portion is provided with a plurality of staple holes, each staple hole includes a first hole wall and a second hole wall extending in the axial direction, and the first hole wall is higher than the second hole wall. The present disclosure makes the staplers easier to be separated from the cartridge cover after being closed.

Inventors

Teng SHAN

Assignees

Touchstone International Medical Science Co., Ltd.

Dates

Publication Date: 20260505
Application Date: 20220831
Priority Date: 20210831

Claims (20)

1 . A cartridge assembly comprising: a staple strip comprising at least one staple strip body and a plurality of staples, wherein each staple is rotatably connected to the staple strip body via a connecting portion; a cartridge cover jacketed on the staple strip body, wherein the cartridge cover comprises at least one bent portion extending in an axial direction of the cartridge cover, the bent portion is provided with a plurality of staple holes, each staple hole comprises a first hole wall and a second hole wall extending in the axial direction, the first hole wall and the second hole wall are located on different planes, each staple hole is three-dimensional, and the first hole wall is higher than the second hole wall in a height direction.
2 . The cartridge assembly of claim 1 , wherein the bent portion is connected between an upper plate and a side plate of the cartridge cover, and each staple hole comprises a first section and a second section connected to each other, the first hole wall is located on the upper plate of the cartridge cover, and the second hole wall is located on the side plate of the cartridge cover.
3 . The cartridge assembly of claim 2 , wherein the first hole wall is parallel to a surface of the side plate of the cartridge cover, and the second hole wall is parallel to a surface of the upper plate of the cartridge cover.
4 . The cartridge assembly of claim 2 , wherein a highest point of the connecting portion is lower than a highest point of the first hole wall of the staple hole in the height direction; or, a lowest point of the connecting portion is lower than a highest point of the second hole wall of the staple hole in the height direction.
5 . The cartridge assembly of claim 2 , wherein a projecting area of the connecting portion from the side plate of the cartridge cover at least partially coincides with a projecting area of the staple hole from the side plate of the cartridge cover.
6 . The cartridge assembly of claim 2 , wherein a lateral distance between the first hole wall and the second hole wall of the staple hole is greater than that between two sides of the staple; wherein a projecting area of the staple from the upper plate of the cartridge cover falls within a coverage range of a projecting area of the staple hole from the upper plate of the cartridge cover.
7 . The cartridge assembly of claim 1 , wherein a distal end or a proximal end of the second hole wall is provided with a concave arc, and a lowest point of the concave arc is lower than the second hole wall in the height direction.
8 . The cartridge assembly of claim 1 further comprising a support member; during a process of rotating each of the staples, at least a part of a side wall of each of the staples simultaneously abuts the support member and an inner wall of a side plate of the cartridge cover.
9 . The cartridge assembly of claim 8 , wherein each of the staples further comprises a crown portion connected to the connecting portion; after each of the staples is closed and formed, the crown portion is configured to be rotated to a position substantially parallel to the axial direction, and a highest point of the second hole wall is higher than a lowest point of the crown portion.
10 . The cartridge assembly of claim 9 , wherein the crown portion is provided with a barb, and in an initial state, the second hole wall is higher than the barb.
11 . The cartridge assembly of claim 8 further comprising a firing member, wherein the staple strip body is configured to be mounted on one side of the support member, and the staple strip body comprises a first surface away from the support member; the cartridge cover comprises a second surface arranged relative to the first surface of the staple strip body, and a first gap is formed between the first surface of the staple strip body and the second surface of the cartridge cover; the firing member is movably arranged at a bottom of the cartridge cover and movable along the axial direction; the firing member comprises a cutting portion, and a highest point of the cutting portion is higher than the first surface of the staple strip body in the height direction.
12 . The cartridge assembly of claim 11 , wherein a lowest point of the cutting portion of the firing member is lower than the first surface of the staple strip body in the height direction, and the cutting portion of the firing member is configured to be at least partially aligned with the connecting portion in the axial direction.
13 . The cartridge assembly of claim 11 further comprising at least one cartridge convex portion, wherein the cartridge convex portion comprises a first portion located between the first surface of the staple strip body and the second surface of the cartridge cover, and a height from an upper surface to a bottom surface of the first portion of the cartridge convex portion is equal to that of the first gap.
14 . The cartridge assembly of claim 13 , wherein a surface of the support member is provided with at least one second cartridge convex portion, a surface of the second cartridge convex portion away from the support member is higher than the first surface of the staple strip body in the height direction, and the surface of the second cartridge convex portion away from the support member abuts the second surface of the cartridge cover.
15 . The cartridge assembly of claim 14 , wherein a lateral distance between an inner surface and an outer surface of the first cartridge convex portion is less than that between an inner surface and an outer surface of the staple strip body, and a surface of the staple strip body is provided with at least one mounting hole, wherein the first cartridge convex portion is inserted into the mounting hole; or, the cartridge assembly comprises a plurality of staple strips arranged along the axial direction, and the first cartridge convex portion is configured to be located between the staple strip bodies of adjacent two staple strips.
16 . The cartridge assembly of claim 13 , wherein the first surface of the staple strip body is provided with at least one third cartridge convex portion, and a surface of the third cartridge convex portion away from the staple strip body abuts the second surface of the cartridge cover; or, the second surface of the cartridge cover is provided with a fourth cartridge convex portion extending towards the staple strip, and a surface of the fourth cartridge convex portion facing the staple strip body abuts the first surface of the staple strip body.
17 . A head assembly comprising an anvil and the cartridge assembly according to claim 1 , wherein a surface of the anvil facing the cartridge assembly is an anvil surface, and an anvil cutting slot is provided in the anvil, the anvil surface is provided with an anvil convex portion protruding towards the cartridge assembly on at least one side of the anvil cutting slot; a cartridge cutting slot is provided in the cartridge assembly and the bent portion is provided on one side of the cartridge cover close to the cartridge cutting slot.
18 . The head assembly of claim 17 , wherein the anvil surface is provided with the anvil convex portion on each of two sides of the anvil cutting slot, and at least one cartridge cover is provided on each side of the cartridge cutting slot of the cartridge assembly.
19 . The head assembly of claim 17 , wherein the head assembly has a first state and a second state respectively; when in the first state, a distal side of the anvil is relatively far from the cartridge assembly, and when in the second state, a distal side of the anvil is relatively close to the cartridge assembly; when in the second state, a second gap in a height direction is formed between a lowest point of the anvil convex portion and an upper surface of the cartridge cover; a third gap in a width direction is formed between an outer wall of the anvil convex portion and an inner wall of the cartridge cover.
20 . A surgical stapler comprising the cartridge assembly according to claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is based upon PCT patent application No. PCT/CN2022/116032, filed on Aug. 31, 2022, which claims priority to Chinese Patent Applications No. 202111013470.8, No. 202122086338.1 and No. 202111015381.7, filed on Aug. 31, 2021, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to surgical instruments' technology, more particularly, to a cartridge assembly, a head assembly and a surgical stapler. BACKGROUND In the prior art, the surgical stapler generally includes an instrument platform, a firing handle rotatably connected to the instrument platform and a head assembly mounted on the instrument platform. The head assembly can be inserted through a small incision on the body using a trocar to approach the surgical site for surgery. The head assembly includes a cartridge assembly and an anvil located relative to each other. The cartridge assembly includes a staple strip, a support member supporting the staple strip, and a cartridge cover accommodating the staple strip and the support member. A firing member is provided on a proximal side of the cartridge cover. During a process of firing the surgical stapler, a cutter is pushed to move distally by a cutter pushing rod, then the cutter drives the firing member to move distally, so the firing member pushes staples rotatably connected to a staple strip body outwards, a cutting portion of the firing member separates the staples from the staple strip body, the cutter cuts off the tissue located between the cartridge assembly and the anvil, to complete the process of firing the stapler. In the existing cartridge assembly, an upper plate of the cartridge cover forms staple holes corresponding to the staples. However, as the upper plate of the cartridge cover is high, after the staples are closed, the staples may fail to be completely separated from the cartridge cover, which affects the surgical effect. In the present disclosure, the terms “distal side” and “proximal side” are used herein with reference to an operator manipulating the surgical stapler. The term “proximal side” refers to a side closer to the operator, and the term “distal side” refers to a side away from the operator, that is, a side closer to the surgical site. In the stapler, “inner side” and “outer side” are defined with respect to the axis of the stapler, “inner side” is the side close to the axis, and “outer side” is the side far from the axis. SUMMARY To solve the problems in the prior art, the present disclosure aims to provide a cartridge assembly, a head assembly and a surgical stapler, wherein the staples are easier to be separated from the cartridge cover after the staplers are closed. In the present disclosure, a cartridge assembly is provided, wherein the cartridge assembly includes: a staple strip including at least one staple strip body and a plurality of staples, wherein each staple is rotatably connected to the staple strip body via a connecting portion; a cartridge cover jacketed on the staple strip body, wherein the cartridge cover includes at least one bending portion extending in an axial direction, the bending portion is provided with a plurality of staple holes, each staple hole includes a first hole wall and a second hole wall extending in the axial direction, and the first hole wall is higher than the second hole wall in a height direction. In the present disclosure, a head assembly including an anvil and the cartridge assembly is provided, wherein a surface of the anvil facing the cartridge assembly is an anvil surface, and an anvil cutting slot is provided in the anvil, the anvil surface is provided with an anvil convex portion protruding towards the cartridge assembly on at least one side of the anvil cutting slot; a cartridge cutting slot is provided in the cartridge assembly and the bending portion is provided on one side of the cartridge cover close to the cartridge cutting slot. In the present disclosure, a surgical stapler including the cartridge assembly or the head assembly is provided. The cartridge assembly, the head assembly and the surgical stapler have the following advantages. The present disclosure provides a cartridge assembly used for a surgical assembly, wherein the staple holes are located on the bending portion of the cartridge cover, the second hole wall is lower than the first hole wall, the staple hole partially recesses in the height direction, so that the staples are easier to be separated from the cartridge cover after being closed and formed; furthermore, more tissue can be accommodated in openings of the staple holes for the staples, the staples are easier to puncture the tissue and be formed, thereby improving the surgery effect. BRIEF DESCRIPTION OF THE DRAWINGS By reading the detailed description of non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of the present disclos