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US 5,456,875 AGranted
Method for preparing plastic lancet
AssigneeBecton, Dickinson and Company
InventorJames M. Lambert
Life of this patent
Estimating the term…
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.
Claims6
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.
3 more elements
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.
1 more element
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.
3 more elements
Dependencies are inferred from the claim text.