Patent US5151231A successfully refreshed from Google Patents.
US5151231A
Expired / Lapsed
US
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Method for making liquid crystalline tube having a point
Assignee: Becton Dickinson and Co
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Filing: 1991-09-26
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Granted: 1992-09-29
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Expires: 2011-09-26
Abstract
Abstract A catheter assembly includes a tubing portion and a needle portion, at least one of which is a thermoplastic liquid crystalline polymer. The tubing and needle may be integral or unitary. The invention includes a method to make the assembly in which a melt of the liquid crystalline polymer is shear thinned by passing through an orifice such as an extrusion die to make tubing. The shear thinned melt may be directed into a mold having a point to make a liquid crystalline needle.
Inventors
- 👤 James M. Lambert
- 👤 Donald D. Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:36
CPC Classifications
A; A61; A61M; A61M25/00; A61M25/0009; A61L; A61L29/00; A61L29/04; A61L29/14; C; C08; C08G; C08G63/00; C08G63/02; C08G63/60; C08G63/605; B; B29; B29C; B29C45/00; B29C2045/0098
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
A method for preparing a liquid crystalline polymeric tubing having a point comprising: a) heating a thermotropic liquid crystalline polymer to give a melt having a viscosity of 500 poise or less; b) directing said melt into a tubing mold which includes a point whereby said melt completely fills said mold; c) cooling said melt in said mold whereby said melt solidifies to a tubing having the shape of said mold; and d) removing said tubing from said mold.
Claim 2
Independent Claim
79 words
A method for preparing a liquid crystalline polymeric tubing having a point comprising: a) heating a thermotropic liquid crystalline polymer to give a melt having a viscosity of 500 poise or less; b) directing said melt into a tubing mold which includes a point whereby said melt completely fills said mold; c) cooling said melt in said mold whereby said melt solidifies to a tubing having the shape of said mold; and d) removing said tubing from said mold.
Claim 3
Dependent Claim
111 words
The method of claim 1 wherein said liquid crystalline polymer is selected from the group having structures I and II X--Ar.sub.1 --A--Ar.sub.2 --B--Ar.sub.3 +Y I X--Ar.sub.1 --A--Ar.sub.2 --Y II wherein Ar 1 , Ar 2 and Ar 3 are independently selected from the group consisting of an aromatic ring and a hetercylic ring, A and B are independently selected from the group consisting of alkyloxy, alkyldioxy, oxygen, sulfur, sulfone, carbonyl, oxycarbonyl, alkylcarbonyl alkyloxycarbonyl, alkylcarbonyloxy and oxyalkylcarbonyl wherein at least one of A and B is an oxycarbonyl group, the term alkyl being 1 to 5 carbon atoms, and X and Y are selected from the group consisting of hydroxy and carboxyl.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein said melt is passed through an orifice under pressure prior to said directing step.
Claim 5
Dependent Claim
15 words
The method of claim 1 further comprising machining said point to further sharpen said point.
Claim 6
Dependent Claim
20 words
The method of claim 1 further comprising thermoforming said point in a heated tipping die to further sharpen said point.
Claim 7
Independent Claim
93 words
A method for preparing a liquid crystalline polymeric tubing comprising: a) heating a thermotropic liquid crystalline polyester to give a melt; b) forcing said melt under pressure through an orifice whereby the viscosity of said melt decreases to about 500 poise or less; c) directing said melt of reduced viscosity into a tubing mold which includes a point whereby said melt completely fills said mold; d) cooling said melt in said mold whereby said melt solidifies to a tubing having the shape of said mold; and e) removing said tubing from said mold.
Claim 8
Independent Claim
93 words
A method for preparing a liquid crystalline polymeric tubing comprising: a) heating a thermotropic liquid crystalline polyester to give a melt; b) forcing said melt under pressure through an orifice whereby the viscosity of said melt decreases to about 500 poise or less; c) directing said melt of reduced viscosity into a tubing mold which includes a point whereby said melt completely fills said mold; d) cooling said melt in said mold whereby said melt solidifies to a tubing having the shape of said mold; and e) removing said tubing from said mold.
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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) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |