Patent US4974581A successfully refreshed from Google Patents.
US4974581A
Expired / Lapsed
US
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Ultrasonic knife
Assignee: NMT NEUROSCIENCES (IP) Inc
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Filing: 1989-10-30
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Granted: 1990-12-04
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Expires: 2009-10-30
Abstract
Abstract A curved ultrasonic knife consisting of a transducer unit (5) and an amplitude-amplifying horn connected directly thereto, the knife being shaped to imbue the tip (43) of the horn with, to a great extent, purely longitudinal oscillation. The transducer unit includes a piezoelectric unit axially clamped in the transducer unit (5). A resonance rod (28) located between the piezoelectric unit and the horn (2) is bent to give a deflection of 16°, for example.
Inventors
- 👤 Hans Wiksell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:49
CPC Classifications
A; A61; A61B; A61B17/00; A61B17/32; A61B17/320068; A61B17/22; A61B17/22004; A61B17/22012; A61B17/00234; A61B2017/00238; A61B2017/00261; A61B2217/00; A61B2217/002; A61B2217/005; A61B2217/007
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
An ultrasonic knife having a an operating frequency comprising: a horn (2) with a tip at a remote end thereof (43) to be brought into contact with tissue; and a transducer unit (5) coupled to an opposite end of the horn from said remote end, such that the tip (43) is imparted with a longitudinal oscillation, said transducer unit including a vibrator portion and an angled resonance rod wherein a portion of the angled resonance rod is offset at a predetermined angle from the vibrator portion, said vibrator portion and said angled resonance rod being adapted to vibrate in resonance as a unit at the operating frequency of said knife.
Claim 2
Dependent Claim
110 words
An ultrasonic knife having a an operating frequency comprising: a horn (2) with a tip at a remote end thereof (43) to be brought into contact with tissue; and a transducer unit (5) coupled to an opposite end of the horn from said remote end, such that the tip (43) is imparted with a longitudinal oscillation, said transducer unit including a vibrator portion and an angled resonance rod wherein a portion of the angled resonance rod is offset at a predetermined angle from the vibrator portion, said vibrator portion and said angled resonance rod being adapted to vibrate in resonance as a unit at the operating frequency of said knife.
Claim 3
Dependent Claim
21 words
An ultrasonic knife as claimed in claim 1, wherein said the horn (2) is connected directly to the transducer unit (5).
Claim 4
Dependent Claim
43 words
An ultrasonic knife as claimed in claim 2 wherein the transducer unit (5) comprises another resonance rod and said vibrator portion is a piezoelectric unit (20 -26) clamped between said angled resonance, one of which is curved rod and said other resonance rod.
Claim 5
Dependent Claim
27 words
An ultrasonic knife as claimed in claim 3, wherein the angled resonance rod (28) is located between the piezoelectric unit (20 - 26) and the horn (2).
Claim 6
Dependent Claim
27 words
An ultrasonic knife as claimed in any of claims 1 or 2, wherein the angled resonance rod (28) is angled to give a deflection of approximately 16°.
Claim 7
Dependent Claim
36 words
An ultrasonic knife as claimed in any of claims 1 or 2, wherein the transducer unit (5) has a length of 0.5 lambda where lambda corresponds to the longitudinal vibration wavelength of the transducer unit (5).
Claim 8
Dependent Claim
17 words
An ultrasonic knife as claimed in 6, wherein the horn (2) has a length approximately 0.7 lambda.
Claim 9
Dependent Claim
35 words
An ultrasonic knife as claimed in claims 1 or 2, wherein the transducer unit (5) and horn (2) are arranged to produce a substantially pure longitudinal oscillation for the tip (43) of the horn (2).
References Cited (Backward Citations)
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Cited
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US4561438A
Cited
US4535759A
Cited
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Cited
US4634419A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |