Patent US4250881A successfully refreshed from Google Patents.
US4250881A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catheter insertion device
Assignee: QMI MEDICAL Inc
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Filing: 1979-08-29
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Granted: 1981-02-17
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Expires: 1999-08-29
Abstract
Abstract A catheter insertion device (10) is disclosed which is usable to insert a very flexible catheter (12) formed of a silicone elastomer into the blood vessel of a patient. Catheters of highly flexible material, such as silicone elastomer, are highly desirable for use as such catheters in that they do not initiate a build-up of fibrin in the blood stream as do other, more rigid, catheters. A hub member (18) is slidably received over a needle (14) carrying the catheter (12) and a semi-rigid sleeve (26) extends under the proximal end of the catheter (12) so as to aid in removing the catheter (12) from the needle (14) after the needle (14) has been inserted into the blood stream of the patient.
Inventors
- 👤 Gordon E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/01; A61M25/06; A61M25/065; A61M25/0606; A61M25/0662; A61M2025/0687
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
110 words
A catheter insertion device comprising: an elongated hollow needle (14) sharpened at its distal end (22); a flexible catheter (12) formed of a silicon elastomer and positioned stretched over the needle (14); a hub member (18) slidably received over the proximal end of the needle (14); and a semi-rigid sleeve (26) extending from the hub member (18) toward the distal end of the needle (14) and slidably received around the needle (14), the proximal end of the catheter (12) being stretched over the sleeve (26), the sleeve (26) serving to force the catheter (12) off of the needle (14) as the needle (14) is withdrawn through the hub member (18).
Claim 2
Dependent Claim
110 words
A catheter insertion device comprising: an elongated hollow needle (14) sharpened at its distal end (22); a flexible catheter (12) formed of a silicon elastomer and positioned stretched over the needle (14); a hub member (18) slidably received over the proximal end of the needle (14); and a semi-rigid sleeve (26) extending from the hub member (18) toward the distal end of the needle (14) and slidably received around the needle (14), the proximal end of the catheter (12) being stretched over the sleeve (26), the sleeve (26) serving to force the catheter (12) off of the needle (14) as the needle (14) is withdrawn through the hub member (18).
Claim 3
Dependent Claim
39 words
A catheter insertion device as claimed in claim 1 wherein an elongated portion (28 or 30) is formed adjacent the distal end of the needle (14) to aid in insertion of the catheter (12) into the patient without bunching.
Claim 4
Dependent Claim
29 words
A catheter insertion device as claimed in claim 2 wherein the enlarged portion is formed as a swedged portion (28) at the extreme distal end of the needle (12).
Claim 5
Dependent Claim
29 words
A catheter insertion device as claimed in claim 2 wherein the enlarged portion is formed as a spherical bulb (30) located near the distal end of the needle (12).
Claim 6
Dependent Claim
28 words
A catheter insertion device as claimed in claim 1 wherein the catheter (12) is tapered at its distal end (24) to aid in its insertion into the patient.
Claim 7
Dependent Claim
33 words
A catheter insertion device as claimed in claim 1 wherein the sleeve (26) has an abrupt edge at its distal end to aid in forcing the catheter (12) off of the needle (14).
Claim 8
Dependent Claim
26 words
A catheter insertion device as claimed in claim 1 wherein the catheter (12) in its unstretched state is no larger in diameter than the needle (14).
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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |