Vessel sealer and divider having a variable jaw clamping mechanism

• US 20060129146A1
• Filed: 02/06/2006
• Published: 06/15/2006
• Est. Priority Date: 06/13/2003
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Sherwood Services AG
• Inventors: Dycus, Sean T., Kerr, Duane E., Peterson, Darion
• Granted Patent: US 7,771,425 B2
• Time in Patent Office: Days
• US Class Current: 606/51
• CPC Class Codes: A61B 17/32 Surgical cutting instruments A61B18/042 takes precedence; suture cutters A61B17/0467; instruments for ligaturing or cutting A61B17/128; instruments for rupturing the amniotic membrane A61B17/4208; specially adapted knives for eye surgery A61F9/0133
• 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 2018/00404 Blood vessels other than those in or around the heart
• CPC Class Codes: A61B 2018/00601 Cutting
• CPC Class Codes: A61B 2018/0063 Sealing
• CPC Class Codes: A61B 2018/1412 Blade
• CPC Class Codes: A61B 2018/1455 having a moving blade for cutting tissue grasped by the jaws
• CPC Class Codes: A61B 2018/146 Scissors
• CPC Class Codes: A61B 2090/034 abutting on parts of the device itself

Abstract

An endoscopic bipolar forceps includes a housing and a shaft, the shaft having an end effector assembly at its distal end, which includes two jaw members for grasping tissue therebetween. Each jaw member is adapted to connect to an electrosurgical energy source, enabling them to affect a tissue seal to tissue held therebetween. A drive assembly is included within the housing for moving the jaw members and it includes first and second gear-like cam members. A movable handle is also included, such that movement of the handle rotates the first gear-like cam member into cooperation with the second gear-like cam member to actuate the drive assembly to move the jaw members relative to each other.

Claims

1. An endoscopic bipolar forceps, comprising:

a housing;

a shaft affixed to the housing having an end effector assembly engaged at a distal end thereof, the end effector assembly including two jaw members movable from a first position in spaced relation relative to one another to at least a second position closer to one another for grasping tissue therebetween, each of the jaw members adapted to connect to an electrosurgical energy source such that the jaw members are capable of conducting energy through tissue held therebetween to affect a tissue seal;

a drive assembly disposed within the housing for moving the jaw members from the first position to the second position, the drive assembly including a first gear-like cam member and a second gear-like cam member; and

a movable handle mechanically associated with the first gear-like cam member such that movement of the handle rotates the first gear-like cam member into cooperation with the second gear-like cam member to actuate the drive assembly through an actuating stroke to move at least one jaw member

2. An endoscopic bipolar forceps according to claim 1 wherein the first gear like cam member includes a plurality of gear teeth and the second gear-like cam member includes a plurality of gear teeth, the plurality of gear teeth associated with the first gear-like cam member being different from the plurality of gear teeth of the second gear-like cam member.

3. An endoscopic bipolar forceps according to claim 1 wherein the first gear-like cam member includes a first shape and the second gear-like cam member includes a second shape, the first shape associated with the first gear-like cam member being different from the second shape of the second gear-like cam member.

4. An endoscopic bipolar forceps according to claim 1 wherein the first gear like cam member includes a plurality of gear teeth and the second gear-like cam member includes a plurality of gear teeth, the second gear-like cam member being shaped to vary in curvature to correspondingly vary the actuating stroke of the drive assembly.

5. An endoscopic bipolar forceps according to claim 4 wherein the second gear-like cam member is shaped to include a first shape which actuates the drive assembly through a first actuating stroke of a first length and a second shape which actuates the drive assembly through an actuating stoke of a second length, the first length being greater than the second length.

6. An endoscopic bipolar forceps according to claim 1 further including a trigger assembly operatively disposed relative to the movable handle which selectively advances a knife assembly which cuts tissue along the tissue seal.

7. An endoscopic bipolar forceps, comprising:

a housing;

a shaft affixed to the housing having an end effector assembly engaged at a distal end thereof, the end effector assembly including two jaw members movable from a first position in spaced relation relative to one another to at least a second position closer to one another for grasping tissue therebetween, each of the jaw members adapted to connect to an electrosurgical energy source such that the jaw members are capable of conducting energy through tissue held therebetween to affect a tissue seal;

a drive assembly disposed within the housing for moving the jaw members from the first position to the second position;

a movable handle mechanically associated with the housing being rotatable about a pivot to actuate the drive assembly through an actuating stroke which moves the jaw members from the open and closed positions;

a gear-like drive assembly being in mechanical engagement with the movable handle and the drive assembly, the gear-like drive assembly provides a mechanical advantage for manipulating tissue; and

a trigger assembly operatively disposed relative to the movable handle which selectively advances a knife assembly which cuts tissue along the tissue seal.

8. An endoscopic bipolar forceps according to claim 7 wherein the gear-like drive assembly provides a variable-ratio mechanical advantage.

9. An endoscopic bipolar forceps according to claim 7 wherein the gear-like drive assembly includes a variable stroke length which is dimensioned and configured to vary at least one of the force and range applied to the movable handle over the course of the stroke length.