Bilateral foot jaws

• US 7,628,792 B2
• Filed: 09/22/2005
• Issued: 12/08/2009
• Est. Priority Date: 10/08/2004
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Guerra, Paul
• Primary Examiner(s): Cohen; Lee S
• Assistant Examiner(s): SCOTT, AMANDA L
• Application Number:
  US11/232,410
• Publication Number:
  US 20060079890A1
• Time in Patent Office: 1,538 Days
• Field of Search: 606/45, 606 48- 52, 606205-207
• US Class Current: 606/51
• CPC Class Codes: A61B 18/1445 at the distal end of a shaft, e.g. forceps or scissors at the end of a rigid rod
• CPC Class Codes: A61B 2017/2933 camming or guiding means
• CPC Class Codes: A61B 2017/2947 Pivots
• CPC Class Codes: A61B 2018/0013 non-sticking
• CPC Class Codes: A61B 2018/00345 Vascular system
• CPC Class Codes: A61B 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/0063 Sealing
• CPC Class Codes: A61B 2018/126 bipolar

Abstract

A surgical instrument is provided and includes a drive rod assembly having a hollow shaft portion. A central shaft is slidably disposed in and axially aligned with the hollow shaft portion. The instrument may further include a handle assembly coupled to hollow shaft portion and the central shaft of the drive rod assembly. A pair of opposing jaw members each operatively associated with the distal end of the hollow shaft portion, the jaw members being movable relative to one another between a first position wherein the jaw members are disposed in spaced relation relative to one another and a second position wherein the jaw members are approximated towards one another. The instrument may further include a source of electrical energy connected to each jaw member for conducting energy therebetween.

Claims

1. A surgical instrument comprising:

a drive rod assembly including an elongated hollow shaft portion having a proximal end and a distal end and a central shaft slidably disposed in and axially aligned with the hollow shaft portion;

a handle assembly coupled to the hollow shaft portion and the central shaft of the drive rod assembly, the handle assembly configured to actuate the drive rod assembly;

an end effector assembly including a pair of opposing jaw members each being pivotally connected to the central shaft by a pivot pin and each operatively associated with the distal end of the hollow shaft portion, wherein each jaw member includes a jaw housing defining a tissue contacting surface, the jaw housing includes a flange extending therefrom through which pivot pin extends and a flexible cam arm extending proximally from the flange, the flexible cam arms configured to pivot the jaw members about the pivot pin relative to one another between a first position wherein the jaw members are disposed in spaced relation relative to one another and a second position wherein the jaw members are approximated towards one another when the elongated hollow shaft portion is axially displaced relative to the central shaft, and wherein both flexible cam arms are cammed by the hollow shaft portion to move the jaws between the first and second positions and disposed within the hollow shaft portion when the central shaft is moved relative to the hollow shaft portion; and

a source of electrical energy connected to each jaw member for conducting energy therebetween.

2. The surgical instrument according to claim 1, further comprising an activator disposed in the handle assembly, the activator having a movable handle and a fixed handle which cooperate to lock and unlock the jaw members.

3. The surgical instrument according to claim 2, further comprising a rotating assembly attached to the handle assembly, the rotating assembly configured to control rotation of the end effector assembly.

4. The surgical instrument according to claim 1, wherein the jaw members are configured to pivot as the elongated hollow shaft portion is axially displaced relative to the central shaft.

5. The surgical instrument according to claim 1, wherein both flexible cam arms are cammed by the hollow shaft portion to move the jaws from an open position to a closed position when the central shaft is moved distally relative to the hollow shaft portion, and wherein both flexible cam arms are cammed by the hollow shaft portion to move the jaws from the closed position to the open position when the central shaft is moved proximally relative to the hollow shaft portion.

6. The surgical instrument according to claim 1, wherein the central shaft further comprises a bifurcated distal end defining a pair of arms and a cavity between the arms for receiving the flanges of jaw members.

7. The surgical instrument according to claim 1, further comprising electrically conductive sealing surfaces disposed on each jaw member, the electrically conductive sealing surfaces being electrically connected to the source of electrical energy.

8. The surgical instrument according to claim 7, wherein each jaw member is electrically isolated from one another.

9. The surgical instrument according to claim 7, wherein the sealing surfaces are coated with a non-stick material.

10. The surgical instrument according to claim 7, wherein at least one of the pair of jaw members is partially constructed of a hard anodized aluminum having a high dielectric strength which electrically isolates the jaw members and confines the electrosurgical energy between the electrically conductive sealing surfaces.

11. The surgical instrument according to claim 7, further comprising a switching mechanism for selecting between a variety of heating technologies.

12. The surgical instrument according to claim 1, wherein the surgical instrument further includes a knife assembly slidably supported in the elongate hollow shaft, the knife assembly being configured and dimensioned to cut tissue grasped between jaw members.

13. The surgical instrument according to claim 1, wherein the cam arms are constructed of a resilient material.

14. The surgical instrument according to claim 1, wherein the jaw members are at least partially constructed of at least one of titanium and stainless steel.

15. The surgical instrument according to claim 1, wherein the cam arm of a first jaw member extends through a first aperture formed in the hollow shaft portion and the cam arm of a second jaw member extends through a second aperture formed in the hollow shaft portion, and wherein proximal displacement of the hollow shaft portion relative to the central shaft results in a distal surface of said apertures engaging a distal surface of said cam arms to move the jaw members to the second position, and wherein distal displacement of the hollow shaft portion relative to the central shaft results in a proximal surface of said apertures engaging a proximal surface of said cam arms to move the law members to the first position.

16. A surgical instrument comprising:

a drive rod assembly including an elongated hollow shaft portion having a proximal end and a distal end and a central shaft slidably disposed in and axially aligned with the hollow shaft portion;

a handle assembly coupled to the hollow shaft portion and the central shaft of the drive rod assembly, the handle assembly configured to actuate the drive rod assembly;

a pair of opposing jaw members each operatively associated with the distal end of the hollow shaft portion, the jaw members being movable relative to one another between an open position wherein the jaw members are disposed in spaced relation relative to one another and a closed position wherein the jaw members are approximated towards one another, wherein each jaw member includes a flexible cam arm extending from a proximal end thereof, the flexible cam arms configured to pivot the jaw members between open and closed positions when the elongated hollow shaft portion is axially displaced relative to the central shaft, wherein both cam arms are cammed by the hollow shaft portion to move the jaws from the open position to the closed position when the central shaft is moved distally relative to the hollow shaft portion, and wherein both flexible cam arms are cammed by the hollow shaft portion to move the jaws from the closed position to the open position when the central shaft is moved proximally relative to the hollow shaft portion; and

a source of electrical energy connected to each jaw member for conducting energy therebetween.

17. The surgical instrument according to claim 16, further comprising a knife assembly slidably supported in the elongate hollow shaft, the knife assembly being configured and dimensioned to cut tissue grasped between jaw members.

18. The surgical instrument according to claim 16, further comprising electrically conductive sealing surfaces having a series of stop members, the stop members being configured and dimensioned to facilitate gripping and manipulation of tissue and defining a gap between the jaw members.

19. The surgical instrument according to claim 16, wherein the cam arm of a first jaw member extends through a first aperture formed in the hollow shaft portion and the cam arm of a second jaw member extends through a second aperture formed in the hollow shaft portion, and wherein proximal displacement of the hollow shaft portion relative to the central shaft results in a distal surface of said apertures engaging a distal surface of said cam arms to move the jaw members to the second position, and wherein distal displacement of the hollow shaft portion relative to the central shaft results in a proximal surface of said apertures engaging a proximal surface of said cam arms to move the jaw members to the first position.