Patent US5443448A successfully refreshed from Google Patents.
US5443448A
Expired / Lapsed
US
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Dual flexible introducer and cannula
Assignee: DLP Inc
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Filing: 1994-05-31
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Granted: 1995-08-22
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Expires: 2014-05-31
Abstract
Abstract A removable stylet for use in the introduction of cannulae into a vessel or chamber of a body for medical procedures, and a retrograde coronary sinus perfusion cannula using such stylet. The stylet is used to guide the cannula during insertion, and includes a proximal relatively stiff end that can be manually manipulated by the attending physician to guide the stylet. On the distal end of the stylet is a relatively flexible portion that can be shaped into various curves and which is form-retaining while retaining flexibility.
Inventors
- 👤 James H. DeVries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/09; A61M25/09016; A61M25/09033; A61M2025/09058; A61M2025/09083; A61M2025/09091; A61M2025/09175
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
72 words
A flexible cannula having an interior lumen and a distal end to be introduced into body vessels and chambers for medical procedures, and a removable introducer stylet to be carried in said lumen comprising a relatively rigid proximal end portion to be manipulated by an attendant physician and a relatively flexible distal end, said stylet comprising an integral shaft heat treated to render the distal end more flexible than the proximal end.
Claim 2
Dependent Claim
72 words
A flexible cannula having an interior lumen and a distal end to be introduced into body vessels and chambers for medical procedures, and a removable introducer stylet to be carried in said lumen comprising a relatively rigid proximal end portion to be manipulated by an attendant physician and a relatively flexible distal end, said stylet comprising an integral shaft heat treated to render the distal end more flexible than the proximal end.
Claim 3
Dependent Claim
34 words
A cannula and stylet combination as defined in claim 1 in which said stylet comprises a metallic shaft, the distal end of which is annealed to a soft and flexible but shape retaining condition.
Claim 4
Dependent Claim
72 words
An introducer stylet for medical cannulation that comprises: a handle for manipulation by a user, and elongated guide means affixed to and extending from said handle, said guide means comprising a solid length of metallic composition that is heat treated such that the portion of said length adjacent to said handle is stiff and the portion remote from said handle is shape-retaining and more flexible than the portion adjacent to said handle.
Claim 5
Dependent Claim
72 words
An introducer stylet for medical cannulation that comprises: a handle for manipulation by a user, and elongated guide means affixed to and extending from said handle, said guide means comprising a solid length of metallic composition that is heat treated such that the portion of said length adjacent to said handle is stiff and the portion remote from said handle is shape-retaining and more flexible than the portion adjacent to said handle.
Claim 6
Dependent Claim
29 words
The stylet set forth in claim 3 wherein said solid length is of non-uniform cross section, being of lesser diameter remote from said handle than adjacent to said handle.
Claim 7
Dependent Claim
19 words
The stylet set forth in claim 3 wherein said solid length is of uniform cross section throughout its length.
Claim 8
Dependent Claim
29 words
The stylet set forth in claim 5 wherein said guide means further comprises a tightly coiled spring surrounding at least that portion of said length remote from said handle.
Claim 9
Dependent Claim
26 words
The stylet set forth in claim 6 wherein said spring is affixed to and extends from said handle, surrounding the entire length of said solid length.
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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) | 1998-08-21 | 1999-02-20 | 1999-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-21 | 2003-02-20 | 2003-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-21 | 2007-02-20 | 2007-08-22 | $7700.00 | Window Closed / Lapsed |