END EFFECTOR ASSEMBLY WITH INCREASED CLAMPING FORCE FOR A SURGICAL INSTRUMENT

• US 20110276085A1
• Filed: 05/04/2010
• Published: 11/10/2011
• Est. Priority Date: 05/04/2010
• Status: Active Grant

• Current Assignee: Jacek Krzyzanowski
• Original Assignee: Jacek Krzyzanowski
• Inventors: Krzyzanowski, Jacek
• Granted Patent: US 8,394,120 B2
• Time in Patent Office: Days
• US Class Current: 606/208
• CPC Class Codes: A61B 10/06 Biopsy forceps , e.g. with cup-shaped jaws
• CPC Class Codes: A61B 2017/2933 camming or guiding means
• CPC Class Codes: A61B 2017/2939 Details of linkages or pivot points
• CPC Class Codes: A61B 2017/320064 with tissue or sample retaining means

Abstract

An end effector assembly with increased clamping force for a surgical instrument including a hollow shaft having a proximal end and a distal end, a clevis coupled to the distal end of the hollow shaft, a flat support coupled to the clevis, a deflection member, a procedural member assembly rotatably coupled to the flat support and a pair of actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the deflection member engaged the actuation means. The deflection member may be integral with the clevis, coupled to the clevis and the flat support, coupled to just the flat support, may be adjustable or rotatable or coupled to hollow shaft.

Claims

1. An end effector assembly with increased clamping force for a surgical instrument comprising:

(a) a hollow shaft having a proximal end and a distal end;

(b) a clevis coupled to the distal end of the hollow shaft;

(c) at least one deflection member integral with the clevis;

(d) a procedural member assembly rotatably coupled to the clevis;

(e) at least one actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the at least one deflection member integral with the clevis engages at least one actuation means.

2. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 1 wherein the deflection member is an integral shoulder for engaging at least one actuation means.

3. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 2 wherein the integral shoulder further comprises a lubricious material for reducing friction.

19. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 1, 4, 8, 12 or 16 wherein the actuation means compromises of at least one filament.

20. An end effector assembly with increased clamping force for surgical instrument as claimed in claim 1, 4, 8, 12 or 16 wherein the engagement of the actuation means by the deflection member results in increased clamping force when the procedural member assembly is in the closed position;

the value of the clamping force described by function;

F_c(β

)=F₁*[A*cos(β

)+B*sin(β

)]/(A²+B²)<sup>−

2</sup>, this function reaching its maximum value for β

_max with given design constrains and not considering any losses due to engagement of the components of the surgical instrument.

21. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 20 wherein design constrains A and B can be dynamically changed and dynamically change the clamping force F_c.

22. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 20 wherein the position of the deflection member can vary changing the deflection angle β

and the value of the function F_c(β

).

4. An end effector assembly with increased clamping force for a surgical instrument comprising:

(a) a hollow shaft having a proximal end and a distal end;

(b) a clevis coupled to the distal end of the hollow shaft;

(c) a flat support coupled to the clevis;

(d) at least one deflection member coupled to the clevis and the flat support;

(e) a procedural member assembly rotatably coupled to the flat support;

(f) at least one actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the at least one deflection member coupled to the clevis and the flat support engages at least one actuation means.

5. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 4 wherein the deflection member is at least one pin coupled to the clevis and the flat support through a series of apertures in the clevis and the flat support.

6. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 5 wherein the deflection member further comprises a lubricious material for reducing friction.

7. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 7 wherein the deflection member is rotatable within the apertures.

8. An end effector assembly with increased clamping force for a surgical instrument comprising:

(a) a hollow shaft having a proximal end and a distal end;

(b) a flat support;

(c) at least one deflection member coupled to the flat support;

(d) a procedural member assembly rotatably coupled to the flat support;

(e) at least one actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the at least one deflection member coupled to the flat support engages at least one actuation means.

9. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 8 wherein the deflection member is at least one pin coupled to the flat support.

10. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 9 wherein the deflection member further comprises a lubricious material for reducing friction.

11. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 9 wherein the deflection member is rotatable within the aperture of the flat member.

12. An end effector assembly with increased clamping force for a surgical instrument comprising:

(a) a hollow shaft having a proximal end and a distal end;

(b) a flat support having a slot;

(c) at least one deflection member moveably coupled within the slot of the flat support;

(d) a procedural member assembly rotatably coupled to the flat support;

(e) at least one actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the at least one deflection member movably coupled with the slot of the flat support engages at least one actuation means.

13. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 12 wherein the deflection member is at least one pin movably coupled to slot in the flat support.

14. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 13 wherein the deflection member further comprises a lubricious material for reducing friction.

15. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 12 wherein the deflection member is rotatable within the slot of the flat member.

16. An end effector assembly with increased clamping force for a surgical instrument comprising:

(a) a hollow shaft having a proximal end and a distal end;

(b) at least one deflection member coupled to the hollow shaft;

(c) a rotatable procedural member assembly;

(d) at least one actuation means attached to the procedural member assembly and slidable relative to the hollow shaft for rotationally moving the procedural member assembly between a closed and an open position wherein the at least one deflection member coupled to the hollow shaft or being integral part of the hollow shaft engages at least one actuation means.

17. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 16 wherein the deflection member is at least one shoulder coupled to the hollow shaft or at least one shoulder being an integral part of the hollow shaft.

18. An end effector assembly with increased clamping force for a surgical instrument as claimed in claim 17 wherein the deflection member further comprises a lubricious material for reducing friction.