Surgical stapler and method for attaching and detaching it

Abstract

The present invention provides a surgical stapler and a method for attaching and detaching the stapler that do not require auxiliary tools for attaching and detaching end members and are easy to operate. [Solution] The surgical stapler includes an end member 40 detachably attached to a staple anvil assembly, the end member 40 having a lumen 41 open at its proximal end and an elastic member 43 extending outward from the lumen 41, the staple anvil assembly having a distal end that can be inserted into the lumen 41 and is engageable with the elastic member 43. The method for attaching and detaching the end member 40 of the surgical stapler involves the distal end pressing and deforming the elastic member 40 and partially inserting it into the lumen 41, and engaging with the elastic member 40 which has been restored by further insertion of the distal end, and detaching the end member 40 by the distal end pressing and deforming the elastic member 40 and partially withdrawing it from the lumen 41, and completely withdrawing the distal end from the lumen 41 and detaching it from the restored elastic member 43.

Claims

1. A fixed staple anvil assembly (32), A staple cartridge assembly (31) is rotatably hinged to the staple anvil assembly (32), The end member (40) is detachably attached to the staple anvil assembly (32) and includes a curved portion (42) that curves toward the staple cartridge assembly (31), The end member (40) has a lumen (41) that is open at the proximal end, the staple anvil assembly (32) has a distal end (324) that can be inserted into the lumen (41), the distal end (324) has an inclined surface (326) toward the proximal end, the end member (40) includes an elastic member (43) extending outward from the lumen (41), the inclined surface (326) is engageable with the elastic member (43), and the lumen (41) has a first inner surface ( The elastic member (43) has a gap between the elastic member (43) and the first inner surface (411) to allow the insertion or withdrawal of the distal end (324), the lumen (41) has a second inner surface (412) away from the staple cartridge assembly (31), and the elastic member (43) can deform between the first inner surface (411) and the second inner surface (412) to change the gap between the elastic member (43) and the first inner surface (411) or the second inner surface (412), When the distal end (324) presses against and deforms the elastic member (43), the distal end (324) is partially inserted into the lumen (41) or withdraws from the lumen (41). When the distal end (324) is fully inserted into the lumen (41), the distal end (324) engages with the restored elastic member (43). When the distal end (324) completely withdraws from the lumen (41), the distal end (324) detaches from the restored elastic member (43). A surgical stapler characterized by the following features.

2. The shape of the lumen (41) is compatible with the shape of the distal end (324), and the distal end (324) can be fitted into the lumen (41). The surgical stapler according to feature 1.

3. The proximal end portion of the elastic member (43) extends outward from the lumen (41) and is inclined toward the staple cartridge assembly (31). The surgical stapler according to feature 1.

4. The first inner surface (411) can contact the surface of the distal end (324) closest to the staple cartridge assembly (31). The surgical stapler according to feature 1.

5. The first inner surface (411) has a recessed groove (44) that extends from the proximal end to the distal end. The surgical stapler according to feature 1.

6. The distance between the first inner surface (411) and the second inner surface (412) is greater at the proximal end than at the distal end. The surgical stapler according to feature 1.

7. The elastic member (43) includes a first bent portion (433) and a second bent portion (434) arranged from the distal end toward the proximal end, the first bent portion (433) curving toward the staple cartridge assembly (31), and the second bent portion (434) curving toward away from the staple cartridge assembly (31), and the first bent portion (433) and the second bent portion (434) can interact with the distal end (324). The surgical stapler according to feature 1.

8. The first bent portion (433) and the second bent portion (434) can interact with the inclined surface (326). The surgical stapler according to feature 7.

9. The staple anvil assembly (32) has a passage (325) adjacent to the distal end (324), and the passage (325) can accommodate the proximal end portion of the elastic member (43). The surgical stapler according to feature 1.

10. A method for attaching and detaching surgical staplers, The surgical stapler includes a fixed staple anvil assembly (32), a staple cartridge assembly (31) rotatably hinged to the staple anvil assembly (32), and an end member (40) detachably attached to the staple anvil assembly (32) and including a curved portion (42) that curves toward the staple cartridge assembly (31), wherein the end member (40) has a lumen (41) that is open at the proximal end, the staple anvil assembly (32) has a distal end (324) that can be inserted into the lumen (41), the distal end (324) has an inclined surface (326) toward the proximal end, and the end member (40) has a lumen (41 The inclined surface (326) is engageable with the elastic member (43), the lumen (41) has a first inner surface (411) closer to the staple cartridge assembly (31), and there is a gap between the elastic member (43) and the first inner surface (411) to allow the insertion or withdrawal of the distal end (324), the lumen (41) has a second inner surface (412) further away from the staple cartridge assembly (31), and the elastic member (43) is deformable between the first inner surface (411) and the second inner surface (412) to change the gap between the elastic member (43) and the first inner surface (411) or the second inner surface (412), The method for attaching and detaching the surgical stapler is as follows: The steps include: causing the distal end (324) to press against and deform the elastic member (43) and to be partially inserted into the lumen (41); The steps include: ensuring that the distal end (324) is fully inserted into the lumen (41) and engages with the retracted elastic member (43); The steps include: causing the distal end (324) to press against and deform the elastic member (43) and partially retract from the lumen (41); The step includes causing the distal end (324) to completely retract from the lumen (41) and detach from the restored elastic member (43). A method for attaching and detaching surgical staplers, characterized by the following features.

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