Vessel sealer an divider

• US 20040087943A1
• Filed: 09/11/2003
• Published: 05/06/2004
• Est. Priority Date: 04/06/2001
• Status: Active Grant

• Current Assignee: Covidien AG (Medtronic Plc)
• Original Assignee: Covidien AG (Medtronic Plc)
• Inventors: Dycus, Sean T., Farascioni, David
• Granted Patent: US 7,118,587 B2
• Time in Patent Office: Days
• US Class Current: 606/51
• CPC Class Codes: A61B 17/08 Wound clamps or clips, i.e. not or only partly penetrating the tissue suture bridges A61B17/0466; Devices for bringing together the edges of a wound
• CPC Class Codes: A61B 17/2909 Handles
• 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 2017/12004 for haemostasis, for prevention of bleeding
• CPC Class Codes: A61B 2017/2929 with a head rotatable about the longitudinal axis of the shaft
• CPC Class Codes: A61B 2017/2936 Pins in guiding slots
• CPC Class Codes: A61B 2017/2946 Locking means
• CPC Class Codes: A61B 2018/00601 Cutting

Abstract

A electrosurgical instrument includes a housing having a shaft attached thereto which connects a pair of first and second jaw members in an opposing manner relative to one another. The jaw members are movable relative to one another from a first open position wherein the jaw members are disposed in spaced relation relative to one another to a second closed position wherein the jaw members cooperate to grasp tissue therebetween. The instrument also includes a handle assembly having a four-bar mechanical linkage which cooperates with a drive assembly to impart movement to the first and second jaw members from the first and second positions.

Claims

1. An electrosurgical instrument for performing at least one of sealing and dividing tissue, comprising:

a housing having a shaft attached thereto;

a first jaw member movable relative to a second jaw member, the first jaw member attached to the shaft and being relatively movable from a first open position wherein the jaw members are disposed in spaced relation relative to one another to a second closed position wherein the jaw members cooperate to grasp tissue therebetween;

a drive rod assembly for imparting movement of the jaw members between the first and second positions; and

a handle assembly attached to the housing for actuating the drive rod assembly, the handle assembly including a four-bar mechanical linkage.

2. An electrosurgical instrument according to claim 1 wherein the first and second jaw members are movable in a pivotable fashion relative to one another and the four-bar mechanical linkage of the handle assembly includes a handle which is movable relative to the housing which cooperates with a cam-like piston to effect movement of the drive assembly.

3. An electrosurgical instrument according to claim 2 wherein the handle and the cam-like piston of the four-bar mechanical linkage cooperate with a spring to create a uniform closure pressure against tissue grasped between the jaw members.

4. An electrosurgical instrument according to claim 2 wherein the handle is lockable within the housing to selectively lock the jaw members relative to one another.

5. An electrosurgical instrument according to claim 1 wherein the electrosurgical instrument further includes a knife assembly for separating tissue, the knife assembly movable from a locked configuration to an unlocked configuration upon movement of the four-bar mechanical linkage.

6. An electrosurgical instrument according to claim 5 wherein the handle includes a flange which is reciprocated into a channel having predefined internal dimensions disposed within the housing, the flange being dimensioned to cooperate with the predefined internal dimensions of the channel to selectively lock the jaw members relative to one another and unlock the knife assembly.

7. An electrosurgical instrument according to claim 5 wherein the knife assembly is independently operable from the handle assembly when the jaw members are disposed in the closed position.

8. An electrosurgical instrument according to claim 5 wherein at least one jaw member includes a longitudinal channel at least partially defined therethrough which permits reciprocation of the knife assembly along a cutting plane to separate tissue.

9. An electrosurgical instrument according to claim 8 wherein the knife assembly includes a leading edge which is substantially blunt.

10. An electrosurgical instrument for performing at least one of sealing and dividing tissue, comprising:

a housing having a shaft attached thereto, the shaft defining a longitudinal axis;

first and second jaw members pivotally attached to the shaft in opposing relation relative to one another, the jaw members being relatively movable from a first open position wherein the jaw members are disposed in spaced relation relative to one another to a second closed position wherein the jaw members cooperate to grasp tissue therebetween;

a drive rod assembly for imparting movement of the jaw members between the first and second positions;

a rotating assembly attached to the housing for rotating the jaw members about the longitudinal axis;

a knife assembly attached to the housing for separating tissue; and

a handle assembly attached to the housing for actuating the drive rod assembly, the handle assembly including a four-bar mechanical linkage which includes a handle and a cam-like piston which cooperate with a spring to impart a uniform closure pressure against tissue grasped between the jaw members.