Patent US4114601A successfully refreshed from Google Patents.
US4114601A
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Medical and surgical implement detection system
Assignee: ABELS MICHAEL A
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Filing: 1976-08-09
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Granted: 1978-09-19
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Expires: 1996-08-09
Abstract
Abstract A method by which surgical implements, surgical instruments, surgical sponges, surgical implantable devices and indwelling therapeutic devices and materials may be detected within the human body or other area of interest by incorporating or adding a radiofrequency transponder. Non-linear mixing of two frequencies in a radiofrequency transponder is used. The transponder may be a small film deposition of Ferrite material exhibiting gyro-magnetic resonance at selected frequencies or a solid state device.
Inventors
- 👤 Michael Allen Abels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:23
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/06; A61B90/00; A61B90/90; A61B90/98; A61F; A61F13/00; A61F13/15; A61F13/44; A61B90/08; A61B2090/0804
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A method of detecting surgical and therapeutic articles or materials within the human body comprising: constructing at least a portion of said articles or materials as a transponder capable of non-linearly mixing two or more radio frequency signals impinging thereon, to thereby generate and reradiate a higher order product frequency; directing two or more radio frequency signals toward the portion of the human body to be investigated; placing a receiving means in the vicinity of said investigated portion to detect and visually or audibly indicate the presence of and reradiated higher order product frequency signal emanating from the investigated area; the existence of said reradiated signal indicating that said surgical or therapeutic article or material is within the human body.
Claim 2
Independent Claim
120 words
A method of detecting surgical and therapeutic articles or materials within the human body comprising: constructing at least a portion of said articles or materials as a transponder capable of non-linearly mixing two or more radio frequency signals impinging thereon, to thereby generate and reradiate a higher order product frequency; directing two or more radio frequency signals toward the portion of the human body to be investigated; placing a receiving means in the vicinity of said investigated portion to detect and visually or audibly indicate the presence of and reradiated higher order product frequency signal emanating from the investigated area; the existence of said reradiated signal indicating that said surgical or therapeutic article or material is within the human body.
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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) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |