US3556103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tracheotomy instrument
Assignee: Individual
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Filing: 1968-03-15
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Granted: 1971-01-19
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Expires: 1988-03-15
Abstract
Abstract A novel tracheotomy instrument adapted to be used in emergency situations comprising an arcuate trocar with a flange at one end, a concentrically arranged hollow, arcuate cannula having a flange abutting the trocar flange at one end and a beveled knife edge extending from the trocar at the opposite end.
Inventors
- 👤 Edward J Calhoun
- 👤 Karoly G Pinter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:11
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/04; A61M16/0465; A61M16/0472
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
129 words
In a tracheotomy instrument an arcuate hollow cannula provided with a flange portion at its proximal end, the arc of the cannula subtending an angle of approximately 90*, and an arcuate, completely hollow trocar concentrically arranged and conforming substantially to the inner surface of said hollow cannula within said cannula, said trocar provided with a flange at its proximal end and a pointed knife edge at its distal end, and being of a length compared to the length of said cannula whereby said knife edge projects beyond the cannula when said cannula and said trocar are telescopically engaged a sufficient distance to allow an incision to be made in the trachea to thereby provide an artificial airway of dimensions adequate to restore free breathing to a blocked natural airway.
Claim 2
Dependent Claim
129 words
In a tracheotomy instrument an arcuate hollow cannula provided with a flange portion at its proximal end, the arc of the cannula subtending an angle of approximately 90*, and an arcuate, completely hollow trocar concentrically arranged and conforming substantially to the inner surface of said hollow cannula within said cannula, said trocar provided with a flange at its proximal end and a pointed knife edge at its distal end, and being of a length compared to the length of said cannula whereby said knife edge projects beyond the cannula when said cannula and said trocar are telescopically engaged a sufficient distance to allow an incision to be made in the trachea to thereby provide an artificial airway of dimensions adequate to restore free breathing to a blocked natural airway.
Claim 3
Dependent Claim
25 words
The tracheotomy instrument of claim 1 wherein a locking device is provided in the flange of the cannula to lock the trocar within the cannula.
Claim 4
Dependent Claim
31 words
The tracheotomy instrument of claim 1 wherein the knife edge comprises a beveled portion, said bevel extending at an acute angle to a tangent to the arcuate axis of the cannula.
Claim 5
Dependent Claim
25 words
The tracheotomy instrument of claim 1 wherein the cannula flange is curved to approximate the curvature of the neck adjacent to the point of incision.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |