EP0968684A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method of balancing asymmetric ultrasonic surgical blades
Assignee: Ethicon Endo Surgery Inc
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Filing: 1999-06-28
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Granted: —
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Expires: 2019-06-28
Abstract
Abstract The present invention describes a method of designing a balanced ultrasonic surgical instrument including an ultrasonic transmission rod and an asymmetric ultrasonically actuated blade attached to the distal end of the ultrasonic transmission rod. According to the present invention, the ultrasonically actuated blade includes a treatment portion. The treatment portion has a functional feature such as, for example, a curved blade which makes the treatment portion asymmetric. In the method according to the present invention, a balance portion including at least a first asymmetric balance feature is designed and positioned between the ultrasonically actuated blade and the ultrasonic transmission rod to balance out any undesirable torque generated by the treatment portion.
Inventors
- 👤 Jean M. Beaupre
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 13:05
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/320068; A61B2017/320069; A61B2017/320072; A61B2017/320074; A61B2017/320077; A61B2017/320089
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A method of balancing a ultrasonic instrument including an asymmetric
ultrasonically actuated blade and an ultrasonic waveguide wherein said asymmetric
ultrasonically actuated blade induces an undesirable torque in said ultrasonic
waveguide, said method comprising the steps of: incorporating a balance region between a distal end of said ultrasonic
waveguide and a proximal end of said asymmetric ultrasonically actuated blade; incorporating one or more balance asymmetries into said balance region,
wherein said one or more balance asymmetries generate a counter torque which
opposes said undesirable torque.
Claim 2
Dependent Claim
26 words
A method of balancing an ultrasonic instrument as set forth in Claim 1
wherein said counter torque is substantially equal in magnitude to said undesirable
torque.
Claim 3
Dependent Claim
34 words
A method of balancing an ultrasonic instrument as set forth in Claim 1
wherein mass is added to said balance region until said counter torque is
substantially equal in magnitude to said undesirable torque.
Claim 4
Dependent Claim
34 words
A method of balancing an ultrasonic instrument as set forth in Claim 1
wherein mass is removed from said balance region until said counter torque is
substantially equal in magnitude to said undesirable torque.
Claim 5
Dependent Claim
189 words
A method of balancing an ultrasonic instrument as set forth in Claim 1
wherein said balance region and said asymmetric blade together comprise a blade
assembly, and wherein said method further includes the step of selectively adding
and subtracting mass in said balance region until: is approximately equal to zero, where: x 0 , y 0 , and z 0 are located in a plane x=0 through said blade assembly at
a balance point which is proximal to a proximal most one of said balance
asymmetries; x 1 , y 1 , and z 1 are located in a plane tangential to a distal tip of said
blade assembly; x 0 , y 0 , and z 0 define with x 1 , y 1 , and z 1 a volume which encloses said
blade assembly; ( x,y,z ) is the acceleration of said blade assembly at any point
(x,y,z); ( x,y,z ) is a vector indicative of the position of any point (x,y,z) on
said blade assembly with respect to said balance point; and ρ( x,y,z ) is the density of said blade assembly at any point (x,y,z).
Claim 6
Dependent Claim
46 words
An ultrasonic surgical instrument including an asymmetric
ultrasonically actuated blade and an ultrasonic waveguide wherein said asymmetric
ultrasonically actuated blade induces an undesirable torque in said ultrasonic
waveguide, said ultrasonic surgical instrument being balanced by a method
according to any one of Claims 1 to 5.
Claim 7
Dependent Claim
22 words
An ultrasonic surgical instrument according to
Claim 6 wherein said wherein said transmission waveguide has a balance
ratio of less than 1:10.
Claim 8
Dependent Claim
20 words
An ultrasonic surgical instrument according to
Claim 11 wherein said balance ratio of said transmission rod is less than
1:200.
References Cited (Backward Citations)
US5669922A
Cited
US5676649A
Cited
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