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 07:44
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.
References Cited (Backward Citations)
US4325903A
Cited
US4843109A
Cited
US4581399A
Cited
US4614629A
Cited
US4661300A
Cited
US4838877A
Cited
US4851503A
Cited
US4867174A
Cited
US4904433A
Cited
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 |