Patent US5997516A successfully refreshed from Google Patents.
US5997516A
Expired / Lapsed
US
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Modified cannula
Assignee: Imperial College London
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Filing: 1995-12-18
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Granted: 1999-12-07
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Expires: 2015-12-18
Abstract
Abstract PCT No. PCT/GB95/02959 Sec. 371 Date Jun. 13, 1997 Sec. 102(e) Date Jun. 13, 1997 PCT Filed Dec. 18, 1995 PCT Pub. No. WO96/18428 PCT Pub. Date Jun. 20, 1996A surgical cannula includes a generally hollow inlet portion which can receive a fluid flow and an angled outlet portion connected in fluid communication with the inlet portion. The outlet portion is disposed at an angle of less than 180 degrees with respect to the longitudinal axis of the inlet portion. The inlet portion is provided with a structure to impart a rotational component of flow to fluid before such fluid encounters the angled outlet portion.
Inventors
- 👤 Colin Caro
- 👤 Denis Doorly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:44
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0067; A61M25/0068; A61M25/007; A61M25/01; A61M25/06; A61M60/00; A61M60/10; A61M60/104; A61M60/109; A61M60/113; A61M60/30; A61M60/36; A61M60/38; A61M2025/0073; A61M2210/00; A61M2210/12; A61M2210/127
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
85 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion, said means comprising a spirally twisted component.
Claim 2
Dependent Claim
85 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion, said means comprising a spirally twisted component.
Claim 3
Dependent Claim
18 words
A cannula as claimed in claim 1 wherein the means to impart the rotational component is internally located.
Claim 4
Dependent Claim
16 words
A cannula as claimed in claim 2 wherein the said means are located within the inlet.
Claim 5
Dependent Claim
20 words
A cannula as claimed in claim 1, wherein the means is in direct contact with the fluid flow in use.
Claim 6
Dependent Claim
26 words
A cannula as claimed in claim 1 wherein the component has a helical or part-helical twist along its length or over a part of its length.
Claim 7
Dependent Claim
35 words
A cannula as claimed in claim 5 wherein the outlet portion includes a conical end point and a plurality of exit windows in the region of the conical end point, through which fluid can flow.
Claim 8
Dependent Claim
92 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, wherein the inlet portion includes a bend which is non-planar with respect to the outlet portion, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, wherein the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion.
Claim 9
Dependent Claim
92 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, wherein the inlet portion includes a bend which is non-planar with respect to the outlet portion, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, wherein the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion.
Claim 10
Dependent Claim
18 words
A cannula as claimed in claim 7 wherein the said bend is an integral part of the cannula.
Claim 11
Dependent Claim
106 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, wherein the outlet portion includes a conical end point and a plurality of exit windows in the region of the conical end point, through which fluid can flow, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion.
Claim 12
Dependent Claim
106 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, wherein the outlet portion includes a conical end point and a plurality of exit windows in the region of the conical end point, through which fluid can flow, and said outlet portion is disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion.
Claim 13
Dependent Claim
90 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, and said outlet portion disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means located within the inlet portion to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion, wherein the means comprises a spirally twisted component.
Claim 14
Dependent Claim
90 words
A surgical cannula comprising a generally hollow inlet portion adapted to receive a fluid flow, and an angled outlet portion connected in fluid communication with said inlet portion, and said outlet portion disposed at an angle of less than 180° with respect to the longitudinal axis of said inlet portion, characterized in that the inlet portion is provided with means located within the inlet portion to impart a rotational component of flow to fluid before such fluid encounters said angled outlet portion, wherein the means comprises a spirally twisted component.
Claim 15
Dependent Claim
27 words
A cannula as claimed in claim 10 wherein the component has a helical or part helical twist along its length or over a part of its length.
Claim 16
Dependent Claim
30 words
A cannula as claimed in claim 11 wherein the outlet portion includes a plurality of exit windows in the region of a conical end point, through which fluid can flow.
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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) | 2002-12-06 | 2003-06-07 | 2003-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-06 | 2007-06-07 | 2007-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-06 | 2011-06-07 | 2011-12-07 | $7700.00 | Window Closed / Lapsed |