US4716897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrosurgical apparatus
Assignee: Olympus Corp
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Filing: 1986-07-03
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Granted: 1988-01-05
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Expires: 2006-07-03
Abstract
Abstract An electrosurgical apparatus includes a radio frequency (RF) power source for supplying an RF signal to an object to be cauterized through a treatment tool and an electrode plate. A dummy load with a certain impedance is coupled in the current path from an active terminal to which the treatment tool is connected to the check terminal connectable to an electrode plate. Before electrosurgical treatment, the dummy load is connected to the active terminal and the check terminal. An actual RF signal flowing through the dummy load is detected and compared with a predetermined RF signal from the RF power source.
Inventors
- 👤 Toshiaki Noguchi
- 👤 Seiichi Hosoda
- 👤 Ichiro Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:40
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/04; A61B18/12; A61B18/1206; A61B18/1233; A61B2018/00636; A61B2018/0066; A61M; A61M2205/00; A61M2205/70
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
163 words
An electrosurgical apparatus, comprising: a housing; a dummy load arranged in said housing of said electrosurgical apparatus; radio frequency (RF) output means for outputting a predetermined RF signal; terminal means on said housing for enabling a connection between said dummy load and said RF output means, including a first terminal connected to said dummy load and a second terminal connected to said RF output means; means for detecting an actual RF signal flowing through said dummy load; and means for comparing a predetermined RF signal from said RF output means with an actual RF signal detected by said detecting means when said dummy load is connected to said RF output means, and for producing a fault alarm signal when the actual detected RF signal deviates excessively from said predetermined RF signal; wherein said connecting means comprises a connection cord arranged outside said housing for connecting said first terminal connected to said dummy load to said second terminal connected to said RF output means.
Claim 2
Dependent Claim
163 words
An electrosurgical apparatus, comprising: a housing; a dummy load arranged in said housing of said electrosurgical apparatus; radio frequency (RF) output means for outputting a predetermined RF signal; terminal means on said housing for enabling a connection between said dummy load and said RF output means, including a first terminal connected to said dummy load and a second terminal connected to said RF output means; means for detecting an actual RF signal flowing through said dummy load; and means for comparing a predetermined RF signal from said RF output means with an actual RF signal detected by said detecting means when said dummy load is connected to said RF output means, and for producing a fault alarm signal when the actual detected RF signal deviates excessively from said predetermined RF signal; wherein said connecting means comprises a connection cord arranged outside said housing for connecting said first terminal connected to said dummy load to said second terminal connected to said RF output means.
Claim 3
Dependent Claim
76 words
An electrosurgical apparatus according to claim 1, including an electrosurgical treatment tool for use with an endoscope, the tool having a distal end, and wherein said connection cord includes a plug detachably connectable to the distal end of said electrosurgical treatment tool, said plug being provided with a clamper extending from a distal end of said plug and adapted to elastically clamp said distal end of said treatment tool against the distal end of said plug.
Claim 4
Dependent Claim
84 words
An electrosurgical apparatus according to claim 1, in which said RF output means comprises: memory means for storing data of the predetermined RF signal when said detecting means detects a desired actual RF signal; output value setting means for setting the predetermined RF signal and reading out data corresponding to the predetermined RF signal from said memory means; and means for generating the desired actual RF signal in response to the data read out from said memory means by said output value setting means.
Claim 5
Dependent Claim
28 words
An electrosurgical apparatus according to claim 3, in which said memory means comprises an erasable programmable read-only memory for storing amplitude data corresponding to the predetermined RF signal.
References Cited (Backward Citations)
US2771554A
Cited
GB1024776A
Cited
US3747605A
Cited
US4057063A
Cited
JPS5894845A
Cited
FR2517955A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |