Circular stapler with an automatic safety mechanism

• US 7,900,806 B2
• Filed: 11/15/2006
• Issued: 03/08/2011
• Est. Priority Date: 12/14/2005
• Status: Active Grant

• Current Assignee: Touchstone International Medical Science Co. Ltd
• Original Assignee: Suzhou Touchstone International Medical Science Co., Ltd.
• Inventors: Lin, Jiang, Yin, Wei-zhong, Chen, Wang-dong
• Primary Examiner(s): Rada; Rinaldi I.
• Assistant Examiner(s): Lopez; Michelle
• Application Number:
  US12/097,252
• Publication Number:
  US 20100059571A1
• Time in Patent Office: 1,574 Days
• Field of Search: 227/175.2, 227/175.1, 227/179.1
• US Class Current: 227/175.1
• CPC Class Codes: A61B 17/068 Surgical staplers , e.g. containing multiple staples or clampsstaplers containing only one staple A61B17/10; magazines or containers for staples A61B17/105; for performing anastomosis A61B17/115; staplers in general B25C5/00
• CPC Class Codes: A61B 17/115 Staplers for performing anastomosis in a single operation
• CPC Class Codes: A61B 17/1155 Circular staplers comprising a plurality of staples
• CPC Class Codes: A61B 2090/037 with a frangible part, e.g. by reduced diameter
• CPC Class Codes: A61B 2090/0814 Preventing re-use

Abstract

A circular stapler with an automatic safety mechanism comprises a stapler body, a stapler head, an actuating mechanism and a transmission adjusting mechanism; wherein the actuating mechanism comprises a handle and a handle coat, the transmission adjusting mechanism comprises a screw rod and an adjusting knob; a stopper is disposed either inside said handle or said handle coat; a safety rod and a pulling sheet are further provided, the safety rod has a safety block on one end and has a protruding block and a pin hole as its middle portion, a cylindrical pin is inserted into the pin hole so as to get the safety rod to be pivotally connected with the stapler body; the pulling sheet has a rear portion mounted on the screw rod and has a pulling hook at its front portion, the pulling hook hooks with the protruding block.

Claims

1. A circular stapler with an automatic safety mechanism, comprising a stapler body, a stapler head, an actuating mechanism and a transmission adjusting mechanism;

wherein the actuating mechanism comprises a handle (1) and a handle coat (2), the handle (1) is connected with the handle coat (2) and is pivotally connected with the stapler body, the transmission adjusting mechanism comprises a screw rod (4) and an adjusting knob (6), the front end of the screw rod (4) is connected with an anvil pulling rod while its rear end is connected with the adjusting knob (6) by means of screw threads, characterized in that;

a stopper (8) is disposed either inside said handle (1) or said handle coat (2);

a safety rod (3) and a pulling sheet (5) are further provided, the safety rod (3) has a safety block (13) on one end and has a second protruding block (14) and a pin hole as its middle portion;

a cylindrical pin is inserted into the pin hole so as to get the safety rod (3) to be pivotally connected with the stapler body;

the pulling sheet (5) has a rear portion (9) mounted on the screw rod (4) and has a pulling hook (10) at its front portion, the pulling hook (10) hooks with the second protruding block (14) which is the middle portion of the safety rod (3);

a restoring spring is provided so as to connect the safety rod (3) with the stapler body, the safety rod (3) is driven by the restoring spring to get reset by rotating anticlockwise around the cylindrical pin which connects the spring with the stapler body, until said safety block (13) props against the stopper (8) which is either disposed inside the handle (1) or the handle coat (2); and

wherein the front portion of said pulling sheet (5) is divided into at least three plates, and the pulling hook (10) is the front portion of the middle plate;

a protruding block (7) is disposed on the handle (1), when the handle (1) is gripped, the protruding block (7) props against and pushes away said middle plate, thereby the pulling hook (10) is disengaged from said protruding block (14) which is the middle portion of the safety rod (3).

2. The stapler according to claim 1, characterized in that, said safety rod (3) has a pointer (12) on the other end, the pointer could be viewed from an indicator window which is disposed at a corresponding place of the stapler body.

3. The stapler according to claim 2, characterized in that, the restoring spring is disposed at a connection place of the safety rod (3) and on a side where the pointer (12) is located.

4. The stapler according to claim 1, characterized in that, the front portion of said pulling sheet (5) is divided into three plates, and the pulling hook (10) is the front portion of the middle plate, the two side plates (11a) and (11b) are respectively disposed in guide slots of the stapler body.

5. The stapler according to claim 1, characterized in that, the middle portion of said screw rod (4) has a small diameter portion (15).

6. The stapler according to claim 1, characterized in that, said stopper (8) is disposed inside said handle (1), said stopper (8) and said handle (1) are made into an integral;

or, said stopper (8) and said handle (1) are separate parts with the stopper (8) fixed on the two side walls of the handle (1).

7. The stapler according to claim 6, wherein said stopper (8) is a block part or a pin.

8. The stapler according to claim 1, characterized in that, said stopper (8) is disposed inside said handle coat (2), said stopper (8) and said handle coat (2) are made into an integral;

or, said stopper (8) and said handle coat (2) are separate parts with the stopper (8) fixed on two side walls of the handle coat (2).

9. The stapler according to claim 8, wherein said stopper (8) is a block part or a pin.

10. The, stapler according to claim 1, wherein said stopper (8) is a block part or a pin.

11. The stapler according to claim 1, characterized in that, said handle (1) and said handle coat (2) are two separate parts, or they are made into an integral.