US5456875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing plastic lancet
Assignee: Becton Dickinson and Co
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Filing: 1993-06-03
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Granted: 1995-10-10
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Expires: 2013-06-03
Abstract
Abstract A plastic article having a sharp point is made of a polymer of high impact strength and high hardness. The article may be a lancet or a needle for skin puncture, suturing or sewing. A method for preparing the article includes shear thinning a melt of a polymer and introducing the shear thinned melt into a mold which includes a sharp point.
Inventors
- 👤 James M. Lambert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:15
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/26; B29C45/261; A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150015; A61B5/150022; A61B5/150206; A61B5/150274; A61B5/150282; A61B5/150374; A61B5/150381; A61B5/150389; A61B5/150404; A61B5/150503; A61B5/150511; A61B5/151; A61B5/15101; A61B5/15103; A61B5/15105; A61B5/15142; B29C2045/0098
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
117 words
A method for preparing a plastic lancet having a point comprising: a) heating a thermoplastic polymer selected from the group consisting of a liquid crystalline polymer, impact resistant acrylic, impact resistant polystyrene and polyurethane having a hard segment of about 90% or greater to give a melt; b) passing said melt through an orifice whereby said melt undergoes shear-thinning, and decreases in viscosity; c) directing said melt of reduced viscosity into a mold which includes a sharp point whereby said melt completely fills said mold; d) cooling said melt in said mold whereby said melt solidifies to an article having the shape of said mold including a sharp point; and e) removing said article from said mold.
Claim 2
Independent Claim
117 words
A method for preparing a plastic lancet having a point comprising: a) heating a thermoplastic polymer selected from the group consisting of a liquid crystalline polymer, impact resistant acrylic, impact resistant polystyrene and polyurethane having a hard segment of about 90% or greater to give a melt; b) passing said melt through an orifice whereby said melt undergoes shear-thinning, and decreases in viscosity; c) directing said melt of reduced viscosity into a mold which includes a sharp point whereby said melt completely fills said mold; d) cooling said melt in said mold whereby said melt solidifies to an article having the shape of said mold including a sharp point; and e) removing said article from said mold.
Claim 3
Dependent Claim
15 words
The method of claim 1 wherein said melt is passed through said orifice under pressure.
Claim 4
Dependent Claim
15 words
The method of claim 1 further comprising machining said point to further sharpen said point.
Claim 5
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 6
Independent Claim
87 words
A method for preparing a plastic lancet having a point comprising: a) directing a melt of a shear-thinned thermoplastic polymer having a durometer hardness of at least 70 Shore D and an impact strength of at least 1.0 ft-lbs/in into a mold which includes a point whereby said melt has a viscosity low enough to completely fill said mold; b) cooling said melt in said mold whereby said melt solidifies to an article having the shape of said mold; and c) removing said article from said mold.
Claim 7
Independent Claim
87 words
A method for preparing a plastic lancet having a point comprising: a) directing a melt of a shear-thinned thermoplastic polymer having a durometer hardness of at least 70 Shore D and an impact strength of at least 1.0 ft-lbs/in into a mold which includes a point whereby said melt has a viscosity low enough to completely fill said mold; b) cooling said melt in said mold whereby said melt solidifies to an article having the shape of said mold; and c) removing said article from said mold.
Claim 8
Independent Claim
86 words
A method for preparing a plastic lancet comprising: a) heating an impact resistant, thermoplastic acrylic to give a melt; b) forcing said melt under pressure through an orifice whereby said melt undergoes shear-thinning and decreases in viscosity; c) directing said melt of reduced viscosity into a 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 lancet having the shape of said mold; and e) removing said lancet from said mold.
Claim 9
Independent Claim
86 words
A method for preparing a plastic lancet comprising: a) heating an impact resistant, thermoplastic acrylic to give a melt; b) forcing said melt under pressure through an orifice whereby said melt undergoes shear-thinning and decreases in viscosity; c) directing said melt of reduced viscosity into a 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 lancet having the shape of said mold; and e) removing said lancet from said mold.
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) | 1998-10-09 | 1999-04-10 | 1999-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-09 | 2003-04-10 | 2003-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-09 | 2007-04-10 | 2007-10-10 | $7700.00 | Window Closed / Lapsed |