Surgical instrument

• US 8,235,274 B2
• Filed: 10/14/2011
• Issued: 08/07/2012
• Est. Priority Date: 08/31/2007
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Tyco Healthcare Group LP (Medtronic Plc)
• Inventors: Cappola, Kenneth
• Primary Examiner(s): Smith, Scott A.
• Application Number:
  US13/273,670
• Publication Number:
  US 20120031946A1
• Time in Patent Office: 298 Days
• Field of Search: 227/19, 227/176.1, 227/175.1, 227/180.1, 227/178.1, 606/139, 606/219
• US Class Current: 227/175.1
• CPC Class Codes: A61B 17/00234 for minimally invasive surgery A61B17/0218, A61B17/0469, A61B17/12013, A61B17/1285, A61B17/29, A61B17/320016 take precedence
• 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 17/0682 for applying U-shaped staples or clamps, e.g. without a forming anvil
• CPC Class Codes: A61B 17/072 for applying a row of staples in a single action , e.g. the staples being applied simultaneously
• CPC Class Codes: A61B 17/07207 the staples being applied sequentially
• CPC Class Codes: A61B 2017/00367 Details of actuation of instruments, e.g. relations between pushing buttons, or the like, and activation of the tool, working tip, or the like
• CPC Class Codes: A61B 2017/00473 Distal part, e.g. tip or head A61B2017/00464 takes precedence
• CPC Class Codes: A61B 2017/07214 Stapler heads
• CPC Class Codes: A61B 2017/07285 characterised by its cutter
• CPC Class Codes: A61B 2017/2927 the angular position of the head being adjustable with respect to the shaft

Abstract

A surgical instrument comprising a handle assembly, a body, a tool assembly and an articulation assembly is disclosed. The articulation mechanism includes a receptacle, and a main shaft. A lower clutch is fixedly positioned within the receptacle and has a serrated portion including a plurality of serrations. An upper clutch includes at least one projection positioned to engage the serrations of the lower clutch to releasably retain the main shaft at a rotatably fixed position. An angle between a first pair of adjacent serrations is defined as a first angle, an angle between a second pair of adjacent serrations is defined as a second angle, and an angle between a third pair of adjacent serrations is defined as a third angle. The first angle, the second angle, and the third angle are each different from one another.

Claims

1. A surgical instrument comprising:

an articulation mechanism including an upper portion and a lower portion, the lower portion including a plurality of serrations and being positioned in juxtaposed relation with the upper portion, the upper portion including at least one projection positioned to engage the serrations of the lower portion;

wherein an angle between a first pair of adjacent serrations is defined as a first angle, an angle between a second pair of adjacent serrations is defined as a second angle, and an angle between a third pair of adjacent serrations is defined as a third angle, and wherein each of the first angle, the second angle, and the third angle are different from one another.

2. The surgical instrument according to claim 1, wherein the first angle is between about 25°

and about 35°

.

3. The surgical instrument according to claim 1, wherein the second angle is between about 5°

and about 15°

.

4. The surgical instrument according to claim 1, wherein the third angle is between about 15°

and about 25°

.

5. The surgical instrument according to claim 1, wherein the first angle is disposed between a first serration and an adjacent second serration and is between about 25°

and about 35°

, and wherein the second angle is disposed between the second serration and an adjacent third serration and is between about 5° and

about 15°

.

6. The surgical instrument according to claim 5, wherein the second angle is also disposed between the third serration and an adjacent fourth serration.

7. The surgical instrument according to claim 6, wherein the third angle is disposed between the fourth serration and an adjacent fifth serration and is between about 15°

and about 25°

.

8. The surgical instrument according to claim 1, wherein the serrations are symmetrically disposed about two axes of the lower portion.

9. The surgical instrument according to claim 1, wherein the upper portion includes exactly two projections.

10. An articulation mechanism for affecting movement of a tool assembly of a surgical instrument between a non-articulated position and at least one articulated position, the articulation mechanism comprising:

a lower portion including a plurality of serrations; and

an upper portion disposed in juxtaposed relation with the lower portion, the upper portion including at least one projection positioned to engage the serrations of the lower portion;

wherein an angle between a first pair of adjacent serrations is defined as a first angle, an angle between a second pair of adjacent serrations is defined as a second angle, and an angle between a third pair of adjacent serrations is defined as a third angle, and wherein each of the first angle, the second angle, and the third angle are different from one another.

11. The articulation mechanism according to claim 10, wherein the first angle is between about 25°

and about 35°

.

12. The articulation mechanism according to claim 11, wherein the second angle is between about 5°

and about 15°

.

13. The articulation mechanism according to claim 12, wherein the third angle is between about 15°

and about 25°

.

14. The articulation mechanism according to claim 10, wherein the first angle is disposed between a first serration and an adjacent second serration and is between about 25°

and about 35°

, and wherein the second angle is disposed between the second serration and an adjacent third serration and is between about 5° and

about 15°

.

15. The articulation mechanism according to claim 14, wherein a fourth serration is disposed adjacent the third serration, and wherein the third angle is disposed between the fourth serration and an adjacent fifth serration and is between about 15°

and about 25°

.