Patent US2346997A successfully refreshed from Google Patents.
Patent US3434477A successfully refreshed from Google Patents.
US3434477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surgical instrument
Assignee: Northwestern University
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Filing: 1966-11-23
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Granted: 1969-03-25
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Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 Edward R Thomas Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:16
CPC Classifications
A; A61; A61B; A61B18/00; A61B18/02; A61F; A61F9/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
158 words
A CRYOSURGICAL SYSTEM FOR PERFORMING SURGICAL OPERATIONS USING VERY COLD TEMPERATURES COMPRISING, A BASE, A SMALL INSTRUMENT ADAPTED TO BE SECURED TO SAID BASE, SAID INSTRUMENT INCLUDING AN ELONGATED TUBULAR HOUSING HAVING A HEAT SINK SECURED IN ONE END THEREOF, A PROBE SECURED IN SAID ONE END FOR TRANSFER OF HEAT FROM SAID HEAT SINK, SAID BASE INCLUDING MEANS FOR SUPPLYING A LIQUID REFRIGERANT, A VALVE ASSEMBLY IN SAID BASE FOR COOPERATION WITH SAID SUPPLY MEANS, A NECK IN THE EXTERIOR SURFACES OF SAID BASE ADAPTED TO RECEIVE AND HOLD SAID INSTRUMENT, ACTUATOR MEANS EXTENDING THROUGH SAID NECK FOR COOPERATION WITH SAID VALVE ASSEMBLY, MEANS FOR ACTUATING SAID VALVE ASSEMBLY TO PERMIT THE LIQUID REFRIGERANT TO FLOW UPWARDLY THROUGH SAID NECK INTO SAID INSTRUMENT, ANDD TRANSFER MEANS FOR CONDUCTING THE LIQUID REFRIGERANT FROM SAID NECK TO A POSITION ADJACENT SAID HEAT SINK AND FOR SPRAYING SAID LIQUID REFRIGERANT ONTO SAID HEAT SINK TO SUBSTANTIALLY REDUCE THE TEMPERATURE THEREOF.
Claim 2
Dependent Claim
158 words
A CRYOSURGICAL SYSTEM FOR PERFORMING SURGICAL OPERATIONS USING VERY COLD TEMPERATURES COMPRISING, A BASE, A SMALL INSTRUMENT ADAPTED TO BE SECURED TO SAID BASE, SAID INSTRUMENT INCLUDING AN ELONGATED TUBULAR HOUSING HAVING A HEAT SINK SECURED IN ONE END THEREOF, A PROBE SECURED IN SAID ONE END FOR TRANSFER OF HEAT FROM SAID HEAT SINK, SAID BASE INCLUDING MEANS FOR SUPPLYING A LIQUID REFRIGERANT, A VALVE ASSEMBLY IN SAID BASE FOR COOPERATION WITH SAID SUPPLY MEANS, A NECK IN THE EXTERIOR SURFACES OF SAID BASE ADAPTED TO RECEIVE AND HOLD SAID INSTRUMENT, ACTUATOR MEANS EXTENDING THROUGH SAID NECK FOR COOPERATION WITH SAID VALVE ASSEMBLY, MEANS FOR ACTUATING SAID VALVE ASSEMBLY TO PERMIT THE LIQUID REFRIGERANT TO FLOW UPWARDLY THROUGH SAID NECK INTO SAID INSTRUMENT, ANDD TRANSFER MEANS FOR CONDUCTING THE LIQUID REFRIGERANT FROM SAID NECK TO A POSITION ADJACENT SAID HEAT SINK AND FOR SPRAYING SAID LIQUID REFRIGERANT ONTO SAID HEAT SINK TO SUBSTANTIALLY REDUCE THE TEMPERATURE THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |