US3788318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable cannular, especially for medical purposes
Assignee: Individual
•
Filing: 1972-06-12
•
Granted: 1974-01-29
•
Expires: 1992-06-12
Abstract
Abstract An expandable tube, referred to herein as a cannula, is formed by arranging at least one sheet of thin flexible material to form a tube while providing teeth or the like on the interengaging surfaces to permit controlled expansion of the tube by adjusting the surfaces over one another.
Inventors
- 👤 A Dusseau
- 👤 S Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:21
CPC Classifications
A; A61; A61M; A61M5/00; A61B; A61B17/00; A61B17/34; A61B17/3417; A61B17/3421; A61B17/3439; A61M25/00; A61M25/01; A61M25/06; A61M25/0662
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
181 words
A cannula for insertion into the body vascular system comprising an elongated tubular portion open at both ends having slidably received therein a removable piercing instrument having a body piercing point protruding from one end of said elongated tubular portion, said tubular portion comprising at least two sheet elements concave toward the axis of said tubular portion, said sheet elements having circumferential portions thereof in overlapping face to face engagement along substantially the entire longitudinal length of said tubular portion, and interengaging teeth formed on the opposed faces of said circumferential portions of said sheet elements and also extending along at least a portion of the longitudinal length of said tubular portion; said teeth being circumferentially inclined to permit relative radial movement of said circumferential portions of said sheet elements in a direction to expand said tubular portion while preventing relative movement of said circumferential portions in the opposite direction, and adjustable means including means connected to said sheet elements and operable to adjust said overlapping regions relatively in at least the direction to increase the diameter of the tubular portion.
Claim 2
Dependent Claim
181 words
A cannula for insertion into the body vascular system comprising an elongated tubular portion open at both ends having slidably received therein a removable piercing instrument having a body piercing point protruding from one end of said elongated tubular portion, said tubular portion comprising at least two sheet elements concave toward the axis of said tubular portion, said sheet elements having circumferential portions thereof in overlapping face to face engagement along substantially the entire longitudinal length of said tubular portion, and interengaging teeth formed on the opposed faces of said circumferential portions of said sheet elements and also extending along at least a portion of the longitudinal length of said tubular portion; said teeth being circumferentially inclined to permit relative radial movement of said circumferential portions of said sheet elements in a direction to expand said tubular portion while preventing relative movement of said circumferential portions in the opposite direction, and adjustable means including means connected to said sheet elements and operable to adjust said overlapping regions relatively in at least the direction to increase the diameter of the tubular portion.
Claim 3
Dependent Claim
62 words
A cannula according to claim 1 in which each sheet element has teeth formed on the inside at a first circumferential portion at one end and on the outside at a second circumferential portion at the other end, said elements being disposed with the said one end of each element overlapping the outside of the said other end of the other element.
Claim 4
Dependent Claim
50 words
A cannula according to claim 1 in which one said element is provided with teeth on the radially outer side and the other said element is provided with teeth on the radially inner side and the elements are disposed in concentric engagement with said one element inside said other element.
Claim 5
Dependent Claim
74 words
A cannula according to claim 1 in which said tubular portion comprises a single sheet element wound into a spiral form about the axis of said tubular portion and having the inside of the outer end and the outside of the inner end provided with interengaging teeth, said teeth being inclined to permit relative movement of said ends in a direction to expand said cannula while preventing relative movement thereof in the opposite direction.
Claim 6
Dependent Claim
36 words
A cannula according to claim 1 which includes a guide ring on said cannula at one end and said adjusting means comprises finger piece means connected to said tubular portion and adjustable circumferentially of said ring.
Claim 7
Dependent Claim
49 words
A cannula according to claim 1 which includes a guide ring at one end of said cannula surrounding said tubular portion, said adjusting means including finger piece means connected to said sheet means and projecting radially therefrom outwardly beyond said guide ring and adjustable circumferentially of said guide ring.
Claim 8
Dependent Claim
25 words
A cannula according to claim 6 which includes means anchoring at least one point along the circumference of said sheet means to said guide ring.
Claim 9
Dependent Claim
18 words
A cannula according to claim 6 which includes flange means at the guide ring end of said cannula.
Claim 10
Dependent Claim
17 words
A cannula according to claim 8 in which said flange means is attached to said guide ring.
Claim 11
Dependent Claim
20 words
A cannula according to claim 6 in which said guide ring is circumferentially slotted for rEceiving said finger piece means.
Claim 12
Dependent Claim
26 words
A cannula according to claim 6 which includes rod means extending axially along said sheet means in a region thereof circumferentially near said finger piece means.
Claim 13
Dependent Claim
39 words
A cannula according to claim 11 in which said rod means is connected to said finger piece means whereby the control action afforded by said finger piece means is effective over the entire axial length of said sheet means.
Claim 14
Dependent Claim
23 words
A cannula according to claim 12 in which said sheet means is a resilient plastic material and said rod means is imbedded therein.
Claim 15
Dependent Claim
57 words
A cannula according to claim 1 in which a circumferential portion of each said element is disposed inside the circumferential portion of the other said element, and means connected to at least the outer side edges of said sheet elements for adjusting said sheet elements relative to each other to vary the diameter of said tubular portion.
References Cited (Backward Citations)
US447761A
Cited
US1559737A
Cited
US2566499A
Cited
US3044461A
Cited
US3509883A
Cited
US3545430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |