BLADES WITH FUNCTIONAL BALANCE ASYMMETRIES FOR USE WITH ULTRASONIC SURGICAL INSTRUMENTS

• US 20140364884A1
• Filed: 08/25/2014
• Published: 12/11/2014
• Est. Priority Date: 10/05/1999
• Status: Active Grant

• Current Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Original Assignee: Ethicon Endo-Surgery, Inc. (Johnson & Johnson)
• Inventors: Messerly, Jeffrey D.
• Granted Patent: US 9,427,250 B2
• Time in Patent Office: Days
• US Class Current: 606/169
• CPC Class Codes: A61B 17/2816 Pivots
• CPC Class Codes: A61B 17/320092 with additional movable means for clamping or cutting tissue, e.g. with a pivoting jaw
• CPC Class Codes: A61B 2017/2825 Inserts of different material in jaws
• CPC Class Codes: A61B 2017/2929 with a head rotatable about the longitudinal axis of the shaft
• CPC Class Codes: A61B 2017/320075 single edge blade, e.g. for cutting
• CPC Class Codes: A61B 2017/320093 additional movable means performing cutting operation
• CPC Class Codes: A61B 2017/320094 additional movable means performing clamping operation
• CPC Class Codes: A61B 2017/320095 with sealing or cauterizing means

Abstract

Disclosed is an ultrasonic surgical instrument that combines blade end-effector geometry to best affect the multiple functions of a shears-type configuration. The shape of the blade is characterized by a radiused cut offset by some distance to form a curved geometry. The cut creates a curved surface with multiple asymmetries causing multiple imbalances within the blade. Imbalance due to the curve of the instrument is corrected by a non-functional asymmetry proximal to the functional asymmetry. Imbalance due to the asymmetric cross-section of the blade is corrected by the appropriate selection of the volume and location of material removed from a functional asymmetry. The shape of the blade in one embodiment of the present invention is characterized by two radiused cuts offset by some distance to form a curved and potentially tapered geometry. These two cuts create curved surfaces including a concave surface and a convex surface. The length of the radiused cuts affects, in part, the acoustic balancing of the transverse motion induced by the curved shape.

Claims

1. An ultrasonic clamp coagulator apparatus comprising:

an ultrasonic waveguide having a blade extending distally from said distal end of said waveguide; and

said blade having an ultrasonically actuated motion in substantially a single plane of motion and comprises a curved treatment portion defining a plane of asymmetry perpendicular to the plane of motion and a balance portion including at least two balance asymmetries, wherein the balance asymmetries are positioned to counter motion of the blade in a plane orthogonal to the single actuation plane of motion.

2. An ultrasonic clamp coagulator apparatus according to claim 1, wherein excursion of said blade along said plane orthogonal to the single actuation plane is limited to less than 15%.

3. An ultrasonic clamp coagulator apparatus according to claim 1, wherein excursion of said blade along said plane orthogonal to the single actuation plane is limited to less than 10%.

4. An ultrasonic clamp coagulator apparatus according to claim 1, wherein excursion of said blade along said plane orthogonal to the single actuation plane is limited to less than 5%.

5. The ultrasonic clamp coagulator apparatus according to claim 1, further comprising a clamp member having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade and that the motion from the closed position to the open position occurs in a plane substantially perpendicular to the plane of motion of the blade.

6. The ultrasonic surgical instrument of claim 1, wherein at least one of the balance asymmetries extends from the distal end of the blade to a point within the treatment portion.

7. The ultrasonic surgical instrument of claim 1, wherein at least one of the balance asymmetries extends from the distal end of the blade to a point proximal to the treatment portion.

8. The ultrasonic surgical instrument of claim 1, further comprising a damping member enclosing at least a portion of the waveguide.

9. The ultrasonic surgical instrument of claim 5, wherein the clamp member is supported adjacent to the blade and the motion of the clamp member from the closed position to the open position is configured to subscribe an arc larger than the diameter of the outer tube.

10. The ultrasonic surgical instrument of claim 5 further comprising a rotatable member operatively associated with the clamp member and the blade, the rotatable member being rotatable to cause corresponding rotation of the clamp member and the blade about a longitudinal axis of the instrument.

11. An ultrasonic clamp coagulator apparatus comprising:

an ultrasonic waveguide having a blade extending distally from said distal end of said waveguide, the blade comprising an ultrasonically actuated motion in substantially a single plane of motion and a curved treatment portion defining at least two planes of asymmetry; and

a clamp member having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade and that the motion from the closed position to the open position occurs in a plane substantially parallel to at least one of the planes of asymmetry.

12. An ultrasonic clamp coagulator apparatus comprising:

an ultrasonic waveguide having a blade extending distally from said distal end of said outer tube, the blade comprising an ultrasonically actuated motion in substantially a single plane of motion and a curved treatment portion defining at least two planes of asymmetry; and

a clamp member having an open position in which at least a portion of the clamp member is spaced from the blade and a closed position in which the clamp member is adjacent to the blade and that the motion from the closed position to the open position occurs in a plane substantially perpendicular to at least one of the planes of asymmetry.

13. An ultrasonic clamp coagulator apparatus comprising:

an ultrasonic waveguide having a blade extending distally from said distal end of said outer tube; and

said blade having an ultrasonically actuated motion in substantially a single plane of motion and comprises a curved treatment portion defining a plane of asymmetry parallel to the plane of motion and a balance portion including at least two balance asymmetries, wherein the balance asymmetries are positioned to counter motion of the blade in a plane orthogonal to the plane of motion.