Patent US2844711A successfully refreshed from Google Patents.
US4904431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing catheters
Assignee: Baxter International Inc
•
Filing: 1988-08-12
•
Granted: 1990-02-27
•
Expires: 2008-08-12
Abstract
Abstract A method of manufacturing soft tip catheters having inner rigid polymer layers and outer soft, pliable polymer layers. The method involves first extruding the rigid polymer at varying extrusion rates to form a cylindrical body having a depression at one or more prescribed locations. The outer layer is formed by extruding the soft, pliable polymer over the inner to fill in the depressions. The resulting cylindrical body is then cut to form individual catheters having soft tip as defined by a portion of the prescribed locations.
Inventors
- 👤 Samuel L. O'Maleki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:49
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0009; A61M25/001; A61M25/0067; A61M25/008; A61M2025/0081
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A process of forming soft tin catheters comprising: extruding a first cylindrical layer of a rigid polymer having at one or more prescribed locations a depression formed by said layer first decreasing in thickness and then increasing in thickness; extruding a second cylindrical layer of a soft, pliable polymeric material over said first layer, with said first and second layers being extruded to form a cylinder body having a substantially constant thickness; and dissecting said cylindrical body first at each of said depressions and further by cutting said formed cylindrical body to form separate catheters, each having the same coefficient of friction extending the entire internal length of each catheter.
Claim 2
Dependent Claim
110 words
A process of forming soft tin catheters comprising: extruding a first cylindrical layer of a rigid polymer having at one or more prescribed locations a depression formed by said layer first decreasing in thickness and then increasing in thickness; extruding a second cylindrical layer of a soft, pliable polymeric material over said first layer, with said first and second layers being extruded to form a cylinder body having a substantially constant thickness; and dissecting said cylindrical body first at each of said depressions and further by cutting said formed cylindrical body to form separate catheters, each having the same coefficient of friction extending the entire internal length of each catheter.
Claim 3
Dependent Claim
19 words
The process of claim 1 including the steps of embedding a stiffening means between said first and second layers.
Claim 4
Dependent Claim
12 words
The process of claim 2 and wherein the catheters are guiding catheters.
Claim 5
Dependent Claim
118 words
A process of forming soft tip catheters comprising: extruding a first cylindrical layer of a rigid polymer having at one or more prescribed locations a depression formed by said layer first decreasing in thickness and then increasing in thickness; removing a portion of said first cylindrical layer at said formed depression; extruding a second cylindrical layer of a soft, pliable polymeric material over said first layer, with said first and second layers being extruding to form a cylinder body having a substantially constant thickness; and embedding a stiffening means between said first and second layers; and dissecting said cylindrical body first at each of said depressions and further by cutting said formed cylindrical body to form separate catheters.
Claim 6
Dependent Claim
118 words
A process of forming soft tip catheters comprising: extruding a first cylindrical layer of a rigid polymer having at one or more prescribed locations a depression formed by said layer first decreasing in thickness and then increasing in thickness; removing a portion of said first cylindrical layer at said formed depression; extruding a second cylindrical layer of a soft, pliable polymeric material over said first layer, with said first and second layers being extruding to form a cylinder body having a substantially constant thickness; and embedding a stiffening means between said first and second layers; and dissecting said cylindrical body first at each of said depressions and further by cutting said formed cylindrical body to form separate catheters.
Claim 7
Dependent Claim
19 words
The process of claim 4 including the step of removing said stiffening means for each of said prescribed locations.
References Cited (Backward Citations)
US2940126A
Cited
US4138457A
Cited
US4665604A
Cited
US4764324A
Cited
US4636346A
Cited
US4753765A
Cited
US4551292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |