Casing pipe fixing mechanism of endoscope anastomat

Abstract

The utility model relates to an endoscope anastomat cannula fixing mechanism which comprises a first fixing boss, a second fixing boss and a fixing pin, the first fixing boss is fixedly connected to the outer arc face of one semicircular shell, the second fixing boss is fixedly connected to the end, close to a nail bin assembly, of a cannula, and the fixing pin is fixedly connected to the end, close to the nail bin assembly, of the cannula. The face, away from the nail bin assembly, of the first fixing boss is attached to the face, close to the nail bin assembly, of the second fixing boss, the first fixing boss is provided with a first fixing hole allowing the fixing pin to penetrate through, the second fixing boss is provided with a second fixing hole allowing the fixing pin to penetrate through, and the fixing pin penetrates through the first fixing hole and the second fixing hole at the same time. The fixing pin is in interference fit with the inner wall of the first fixing hole and the inner wall of the second fixing hole at the same time. The sleeve can be more visually assembled, the assembling operation is more convenient, and the sleeve is not prone to slipping after being assembled; when the casing pipe is disassembled, the fixing pin is pulled out, operation is convenient, and the casing pipe is not prone to being damaged.

Description

Technical Field

[0001] The utility model relates to the field of laparoscopic staplers, in particular to a fixing mechanism for a sleeve of a laparoscopic stapler. Background Art

[0002] A laparoscopic stapler is one of the important instruments for laparoscopic surgery. It replaces traditional manual suturing and uses titanium staples to sever or anastomose tissues. It is simple and rapid to operate, and can greatly shorten the operation time. The laparoscopic stapler can make the manual operation anastomosis in a narrow surgical field and a deep part easier, more accurate, firm and reliable, and thus significantly reduce the incidence of anastomotic leakage.

[0003] In related technologies, a laparoscopic stapler mainly includes a cartridge assembly 1, a cutting knife, a firing assembly, a swing mechanism, a sleeve 2, etc. The firing assembly is connected to the cartridge assembly 1 through the sleeve 2. One end of the cutting knife close to the firing assembly is connected with a knife handle, and the knife handle passes through the sleeve 2 and penetrates into the shell of the firing assembly. Two semi-cylindrical shells 3 are arranged in the sleeve 2. After the two semi-cylindrical shells 3 are joined together, they form a cylinder. A relief groove for the knife handle to slide is arranged on the mutually close surfaces of the two semi-cylindrical shells 3. The relief groove limits and guides the knife handle, and the outer arc surface of the semi-cylindrical shell 3 fits with the inner wall of the sleeve 2. The sleeve 2 limits and protects the cutting knife and the semi-cylindrical shell 3, and prevents the cutting knife and the semi-cylindrical shell 3 from becoming loose.

[0004] Refer to the attached Figure 1 , a square boss 31 is arranged on the outer arc surface of the traditional semi-cylindrical shell 3, and a square opening 21 for the square boss 31 to be inserted into is arranged on the sleeve 2. When assembling the sleeve 2, it is necessary to first sleeved the sleeve 2 on the cylinder formed by the two semi-cylindrical shells 3, and then rotate the sleeve 2 until the square boss 31 passes through the square opening 21, and then press the outer wall around the square opening 21 of the sleeve 2 to make the side of the square boss 31 away from the semi-cylindrical shell 3 protrude out of the square opening 21, and the square boss 31 and the square opening 21 are tightly matched.

[0005] The inventor believes that when assembling the above-mentioned sleeve 2, the position of the square boss 31 cannot be seen when rotating the sleeve 2, it is not easy to quickly make the square boss 31 pass through the square opening 21, and the operation is cumbersome. When disassembling the sleeve 2, it is necessary to rotate the sleeve 2 forcefully or slide the sleeve 2 to make the square boss 31 disengage from the square opening 21, which may damage the sleeve 2. Therefore, a fixing mechanism that makes the assembly and disassembly operations of the sleeve 2 more convenient is needed. Content of the Utility Model

[0006] In order to solve the above technical problems, the present application provides a fixing mechanism for a sleeve of a laparoscopic stapler.

[0007] A fixing mechanism for a sleeve of a laparoscopic stapler provided by the present application adopts the following technical solution:

[0008] A fixing mechanism for a laparoscopic stapler cannula, comprising a first fixing boss, a second fixing boss and a fixing pin. The first fixing boss is fixedly connected to the outer arc surface of one of the upper semi-cylindrical shells. The second fixing boss is fixedly connected to one end of the cannula close to the cartridge assembly. The surface of the first fixing boss away from the cartridge assembly and the surface of the second fixing boss close to the cartridge assembly are in contact. A first fixing hole for the fixing pin to pass through is formed in the first fixing boss, and a second fixing hole for the fixing pin to pass through is formed in the second fixing boss. The fixing pin passes through the first fixing hole and the second fixing hole at the same time, and the fixing pin is in interference fit with the inner walls of the first fixing hole and the second fixing hole at the same time.

[0009] By adopting the above technical solution, when assembling the cannula, directly align the first fixing boss with the second fixing boss, and then pass the fixing pin through the first fixing hole and the second fixing hole. It can not only assemble the cannula more intuitively, but also make the assembly operation more convenient. After assembly, the cooperation between the cannula and the semi-cylindrical shell is very tight, and the cannula is not easy to slip off.

[0010] When disassembling the cannula, pull out the fixing pin forcefully to disengage from the first fixing hole and the second fixing hole, and then the cannula can be disassembled. The operation is convenient and the cannula is not easy to be damaged.

[0011] Preferably, the surface of the first fixing boss away from the second fixing boss, the two end surfaces of the first fixing boss in the length direction, and the surface of the first fixing boss away from the semi-cylindrical shell are integrally arc-shaped. The surface of the second fixing boss away from the first fixing boss, the two end surfaces of the second fixing boss in the length direction, and the surface of the second fixing boss away from the cannula are integrally arc-shaped.

[0012] By adopting the above technical solution, when the operator assembles or uses the laparoscopic stapler, the operator is not easily injured by the first fixing boss and the second fixing boss.

[0013] Preferably, a positioning block is arranged on the outer wall at one end of the fixing pin in the length direction.

[0014] After the fixing pin passes through the first fixing hole and the second fixing hole in sequence, the positioning block abuts against the first fixing boss.

[0015] After the fixing pin passes through the second fixing hole and the first fixing hole in sequence, the positioning block abuts against the second fixing boss.

[0016] By adopting the above technical solution, it is convenient for the operator to sense the in-place position of the fixing pin.

[0017] Preferably, an auxiliary block is further arranged on the outer wall at one end of the fixing pin in the length direction, and the auxiliary block and the positioning block are located at the same end of the fixing pin in the length direction.

[0018] When the in-place block abuts against the first fixed boss, there is a first distance between the auxiliary block and the first fixed boss;

[0019] When the in-place block abuts against the second fixed boss, there is a second distance between the auxiliary block and the second fixed boss, and the second distance is the same as the first distance.

[0020] By adopting the above technical solution, it is convenient for the operator to push or pull out the fixing pin.

[0021] Preferably, a locking assembly is provided on the fixing pin, and each of the first fixed boss and the second fixed boss corresponds to a set of locking assemblies;

[0022] The locking assembly includes a locking pin and a pressing spring. A receiving groove for the locking pin to move is formed on the outer wall of the fixing pin. The pressing spring is located in the receiving groove. One end of the pressing spring is fixedly connected to the inner wall of the receiving groove, and the other end of the pressing spring is fixedly connected to one end of the locking pin located in the receiving groove. The pressing spring applies a force to the locking pin to make the locking pin move towards the inside of the locking groove. Locking grooves for the locking pin to penetrate are formed on both the first fixed boss and the second fixed boss, and the locking pin penetrates into or disengages from the corresponding locking groove.

[0023] By adopting the above technical solution, after the fixing pin is in place, the locking pins respectively penetrate into the corresponding locking grooves, further fixing the first fixed boss and the second fixed boss, making it more difficult for the fixing pin to disengage from the first fixed boss and the second fixed boss, and improving the stability of the sleeve assembled outside the semi-circular housing.

[0024] Preferably, one end of the locking pin close to the locking groove is arranged in an arc shape.

[0025] By adopting the above technical solution, the smoothness of the locking pin penetrating into or disengaging from the corresponding locking groove is improved.

[0026] Preferably, limiting protrusions are arranged on the outer wall of the locking pin. The limiting protrusions are symmetrically arranged on both sides in the radial direction of the locking pin, and limiting grooves for the limiting protrusions to slide are formed on the inner wall of the receiving groove.

[0027] By adopting the above technical solution, the limiting protrusions slide in the limiting grooves, preventing the locking pin from disengaging from the receiving groove.

[0028] In summary, the present application includes the following beneficial technical effects:

[0029] When assembling the sleeve, directly align the first fixed boss with the second fixed boss, and then pass the fixing pin through the first fixing hole and the second fixing hole. Not only can the sleeve be assembled more intuitively, but the assembly operation is also more convenient. After assembly, the cooperation between the sleeve and the semi-circular housing is very tight, and the sleeve is not easy to slip off;

[0030] When disassembling the sleeve, after pulling out the fixing pin forcefully to disengage from the first fixing hole and the second fixing hole, the sleeve can be disassembled. The operation is convenient and the sleeve is not easily damaged. Description of the Drawings

[0031] Figure 1 is a schematic diagram of the overall structure of a traditional sleeve fixing mechanism in the prior art.

[0032] Figure 2 is a schematic diagram of the overall structure of a sleeve fixing mechanism of a laparoscopic stapler according to an embodiment of the present application.

[0033] Figure 3 is a schematic diagram for showing the structures of the in-place block and the auxiliary block in an embodiment of the present application.

[0034] Figure 4 is a schematic cross-sectional structure diagram for showing the locking assembly in an embodiment of the present application.

[0035] Figure 5 is Figure 4 an enlarged structure diagram of part A in

[0036] Description of the Reference Numerals: 1, staple cartridge assembly; 2, sleeve; 21, square opening; 3, semi-circular housing; 31, square boss; 4, first fixing boss; 41, first fixing hole; 5, second fixing boss; 51, second fixing hole; 6, fixing pin; 61, receiving groove; 611, limiting groove; 7, in-place block; 8, auxiliary block; 9, locking assembly; 91, locking pin; 911, limiting protrusion; 92, biasing spring; 93, locking groove. Detailed Description of the Embodiments

[0037] The following further describes the present application in detail Figures 2 - 5 with reference to the accompanying drawings.

[0038] An embodiment of the present application discloses a sleeve fixing mechanism for a laparoscopic stapler.

[0039] Referring to Figures 2 - 5 , the sleeve fixing mechanism for a laparoscopic stapler includes a first fixing boss 4, a second fixing boss 5, and a fixing pin 6. The first fixing boss 4 is fixedly connected to the outer arc surface of one of the semi-circular housings 3, the second fixing boss 5 is fixedly connected to one end of the sleeve 2 close to the staple cartridge assembly 1. The surface of the first fixing boss 4 away from the staple cartridge assembly 1 and the surface of the second fixing boss 5 close to the staple cartridge assembly 1 are in contact. A first fixing hole 41 for the fixing pin 6 to pass through is formed on the first fixing boss 4, a second fixing hole 51 for the fixing pin 6 to pass through is formed on the second fixing boss 5. The fixing pin 6 passes through the first fixing hole 41 and the second fixing hole 51 at the same time, and the fixing pin 6 is in interference fit with the inner walls of the first fixing hole 41 and the second fixing hole 51 at the same time.

[0040] One side of the first fixing boss 4 away from the second fixing boss 5, both end faces of the first fixing boss 4 in the length direction, and one side of the first fixing boss 4 away from the semi-circular housing 3 are integrally arc-shaped. One side of the second fixing boss 5 away from the first fixing boss 4, both end faces of the second fixing boss 5 in the length direction, and one side of the second fixing boss 5 away from the sleeve 2 are integrally arc-shaped. When an operator assembles or uses the endoscopic stapler, the operator is not easily injured by the first fixing boss 4 and the second fixing boss 5.

[0041] A positioning block 7 is arranged on the outer wall at one end of the fixing pin 6 in the length direction. When the fixing pin 6 sequentially passes through the first fixing hole 41 and the second fixing hole 51 along the direction from approaching the cartridge assembly 1 to departing from the cartridge assembly 1, the positioning block 7 abuts against the first fixing boss 4, and one end of the fixing pin 6 departing from the positioning block 7 protrudes outside the second fixing hole 51. When the fixing pin 6 sequentially passes through the second fixing hole 51 and the first fixing hole 41 along the direction from departing from the cartridge assembly 1 to approaching the cartridge assembly 1, the positioning block 7 abuts against the second fixing boss 5, and one end of the fixing pin 6 departing from the positioning block 7 protrudes outside the first fixing hole 41. The arrangement of the positioning block 7 facilitates the operator to sense the in-place position of the fixing pin 6. In this embodiment, the fixing pin 6 sequentially passes through the first fixing hole 41 and the second fixing hole 51 along the direction from approaching the cartridge assembly 1 to departing from the cartridge assembly 1, and the positioning block 7 abuts against the first fixing boss 4.

[0042] An auxiliary block 8 is further arranged on the outer wall at one end of the fixing pin 6 in the length direction, and the auxiliary block 8 and the positioning block 7 are located at the same end of the fixing pin 6 in the length direction. When the positioning block 7 abuts against the first fixing boss 4, there is a first distance between the auxiliary block 8 and the first fixing boss 4. When the positioning block 7 abuts against the second fixing boss 5, there is a second distance between the auxiliary block 8 and the second fixing boss 5, and the second distance is the same as the first distance. The arrangement of the auxiliary block 8, in cooperation with the first distance and the second distance, facilitates the operator to push or pull out the fixing pin 6.

[0043] The side edges of the positioning block 7 away from one end of the fixing pin 6 and the side edges of the auxiliary block 8 away from one end of the fixing pin 6 are rounded, so that the operator is not easily injured by the positioning block 7 and the auxiliary block 8.

[0044] When assembling the sleeve 2, directly align the first fixing boss 4 with the second fixing boss 5, and then pass the fixing pin 6 through the first fixing hole 41 and the second fixing hole 51 to make the positioning block 7 abut against the first fixing boss 4 or the second fixing boss 5. This can not only more intuitively assemble the sleeve 2, but also make the assembly operation more convenient. After assembly, the cooperation between the sleeve 2 and the semi-circular housing 3 is very tight, and the sleeve 2 is not easily slipped off.

[0045] When disassembling the sleeve 2, after pulling out the fixing pin 6 forcefully to disengage from the first fixing hole 41 and the second fixing hole 51, the sleeve 2 can be disassembled. The operation is convenient and the sleeve 2 is not easily damaged.

[0046] A locking assembly 9 is provided on the fixing pin 6, and each of the first fixing boss 4 and the second fixing boss 5 corresponds to a set of locking assemblies 9.

[0047] The locking assembly 9 includes a locking pin 91 and a pressing spring 92. A receiving groove 61 for the locking pin 91 to move is formed on the outer wall of the fixing pin 6. The pressing spring 92 is located in the receiving groove 61. One end of the pressing spring 92 is fixedly connected to the inner wall of the receiving groove 61, and the other end of the pressing spring 92 is fixedly connected to one end of the locking pin 91 located in the receiving groove 61. The pressing spring 92 applies a force to the locking pin 91 to make the locking pin 91 move towards the inside of the locking groove 93. Locking grooves 93 for the locking pin 91 to penetrate are formed on both the first fixing boss 4 and the second fixing boss 5, and the locking pin 91 penetrates into or disengages from the corresponding locking groove 93.

[0048] When the fixing pin 6 sequentially passes through the first fixing hole 41 and the second fixing hole 51 in the direction from near the staple cartridge assembly 1 to far from the staple cartridge assembly 1, the locking pin 91 farther from the auxiliary block 8 first penetrates into the locking groove 93 of the first fixing boss 4 and then disengages from the locking groove 93 of the first fixing boss 4, and finally penetrates into the locking groove 93 of the second fixing boss 5. After the locking pin 91 penetrates into the corresponding locking groove 93, without external force, it is difficult for the locking pin 91 to disengage from the locking groove 93.

[0049] After the fixing pin 6 is in place, the locking pins 91 respectively penetrate into the corresponding locking grooves 93, further fixing the first fixing boss 4 and the second fixing boss 5, making it more difficult for the fixing pin 6 to disengage from the first fixing boss 4 and the second fixing boss 5, and improving the stability of the sleeve 2 assembled outside the semi-circular housing 3.

[0050] One end of the locking pin 91 close to the locking groove 93 is arranged in an arc shape, improving the smoothness of the locking pin 91 penetrating into or disengaging from the corresponding locking groove 93.

[0051] A limiting protrusion 911 is fixedly connected to the outer wall of the locking pin 91. The limiting protrusions 911 are symmetrically arranged on both sides of the locking pin 91 in the radial direction. A limiting groove 611 for the limiting protrusion 911 to slide is formed on the inner wall of the receiving groove 61. The limiting protrusion 911 slides in the limiting groove 611 to prevent the locking pin 91 from disengaging from the receiving groove 61.

[0052] The implementation principle of the sleeve fixing mechanism of the laparoscopic stapler in the embodiment of the present application is as follows:

[0053] When assembling the sleeve 2, directly align the first fixing boss 4 with the second fixing boss 5, and then pass the fixing pin 6 through the first fixing hole 41 and the second fixing hole 51. This not only enables a more intuitive assembly of the sleeve 2, but also makes the assembly operation more convenient. After the assembly is completed, the cooperation between the sleeve 2 and the semi-circular housing 3 is very tight, and the sleeve 2 is not easily slipped off.

[0054] When disassembling the sleeve 2, after pulling out the fixing pin 6 forcefully to disengage it from the first fixing hole 41 and the second fixing hole 51, the sleeve 2 can be disassembled. The operation is convenient and the sleeve 2 is not easily damaged.

[0055] The above are all the preferred embodiments of this application, and the protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A laparoscopic stapler sleeve fixing mechanism, characterized in that: The invention comprises a first fixing boss (4), a second fixing boss (5) and a fixing pin (6), wherein the first fixing boss (4) is fixedly connected to the outer arc surface of one of the semicircular shells (3), the second fixing boss (5) is fixedly connected to one end of the sleeve (2) close to the nail magazine assembly (1), the side of the first fixing boss (4) away from the nail magazine assembly (1) and the side of the second fixing boss (5) close to the nail magazine assembly (1) are in contact with each other, the first fixing boss (4) is provided with a first fixing hole (41) for the fixing pin (6) to pass through, the second fixing boss (5) is provided with a second fixing hole (51) for the fixing pin (6) to pass through, the fixing pin (6) passes through the first fixing hole (41) and the second fixing hole (51) at the same time, and the fixing pin (6) is simultaneously interference fit with the inner wall of the first fixing hole (41) and the inner wall of the second fixing hole (51).

2. The laparoscopic stapler sleeve fixing mechanism according to claim 1, characterized in that: The side of the first fixed boss (4) away from the second fixed boss (5), the two end faces of the length of the first fixed boss (4) and the side of the first fixed boss (4) away from the semicircular shell (3) are all in the form of an arc surface, and the side of the second fixed boss (5) away from the first fixed boss (4), the two end faces of the length of the second fixed boss (5) and the side of the second fixed boss (5) away from the sleeve (2) are all in the form of an arc surface.

3. The laparoscopic stapler sleeve fixing mechanism according to claim 1, characterized in that: A positioning block (7) is provided on the outer wall of one end of the fixing pin (6) in the length direction; After the fixing pin (6) passes through the first fixing hole (41) and the second fixing hole (51) in sequence, the positioning block (7) abuts against the first fixing boss (4); After the fixing pin (6) passes through the second fixing hole (51) and the first fixing hole (41) in sequence, the positioning block (7) abuts against the second fixing boss (5).

4. The laparoscopic stapler sleeve fixing mechanism according to claim 3, characterized in that: An auxiliary block (8) is also provided on the outer wall of one end of the fixing pin (6) in the length direction, and the auxiliary block (8) and the positioning block (7) are located at the same end of the fixing pin (6) in the length direction; When the in-position block (7) abuts against the first fixed boss (4), a first distance exists between the auxiliary block (8) and the first fixed boss (4); When the positioning block (7) abuts against the second fixed boss (5), a second distance is provided between the auxiliary block (8) and the second fixed boss (5), and the second distance is the same as the first distance.

5. The laparoscopic stapler sleeve fixing mechanism according to claim 1, characterized in that: The fixing pin (6) is provided with a locking assembly (9), and the first fixing boss (4) and the second fixing boss (5) each correspond to a set of locking assemblies (9); The locking assembly (9) comprises a locking pin (91) and a retaining spring (92); a receiving groove (61) for the locking pin (91) to move is provided on the outer wall of the fixing pin (6); the retaining spring (92) is located in the retaining groove (61); one end of the retaining spring (92) is fixedly connected to the inner wall of the retaining groove (61); the other end of the retaining spring (92) is fixedly connected to one end of the locking pin (91) located in the retaining groove (61); the retaining spring (92) applies a force to the locking pin (91) to move toward the locking groove (93); the first fixing boss (4) and the second fixing boss (5) are both provided with a locking groove (93) for the locking pin (91) to penetrate; the locking pin (91) penetrates into or disengages from the corresponding locking groove (93).

6. The laparoscopic stapler sleeve fixing mechanism according to claim 5, characterized in that: One end of the locking pin (91) close to the locking groove (93) is arranged in an arc shape.

7. The laparoscopic stapler sleeve fixing mechanism according to claim 5, characterized in that: A limiting protrusion (911) is provided on the outer wall of the locking pin (91), and the limiting protrusion (911) is symmetrically arranged on both sides of the locking pin (91) in the radial direction. A limiting groove (611) for the limiting protrusion (911) to slide is opened on the inner wall of the accommodating groove (61).

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