Syringe with retractable needle assembly
First Claim
Patent Images
1. A disposable, single use syringe comprised of:
- a hollow body which is substantially open at one end and is substantially closed at its other end except for an aperture through which an injection means passes;
a retractable needle assembly positioned in the hollow body with the injection means passing out through the aperture;
an elongated plunger which moves in the hollow body and has spaced apart retainer means and means for retracting the needle assembly;
a preloaded elastic member extending between the spaced apart retainer means; and
means for automatically releasing the preload on the elastic member upon substantial completion of the injection so that the relaxing elastic member draws the injection means in through the aperture.
5 Assignments
0 Petitions
Accused Products
Abstract
An improved syringe of the type having a hollow body which is closed at one end by an injection means and is open at the other end, the open end receives an elongated plunger means which moves through the hollow body and forces the contents of the body through the injection means. The improvement is comprised of an elastic member which retracts the injection means into a protective covering.
138 Citations
49 Claims
-
1. A disposable, single use syringe comprised of:
-
a hollow body which is substantially open at one end and is substantially closed at its other end except for an aperture through which an injection means passes; a retractable needle assembly positioned in the hollow body with the injection means passing out through the aperture; an elongated plunger which moves in the hollow body and has spaced apart retainer means and means for retracting the needle assembly; a preloaded elastic member extending between the spaced apart retainer means; and means for automatically releasing the preload on the elastic member upon substantial completion of the injection so that the relaxing elastic member draws the injection means in through the aperture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
-
-
24. A disposable, single use syringe comprised of:
-
a hollow body which is substantially open at one end and is substantially closed at its other end except for an aperture through which an injection means passes; a needle assembly, having the injection means extending from a first side and a geometric configuration at an opposite second side, is positioned in the hollow body with the injection means passing through the aperture; an elongated plunger which moves in the hollow body, and has spaced apart retainer means and a complementary geometric configuration at a first end thereof which mates with the needle assembly geometric configuration; a preloaded elastic member extending between the spaced apart retainer means; and means for automatically releasing the preload on the elastic member upon substantial mating of the geometric configurations so that the relaxing elastic member draws the injection means in through the aperture. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
-
Specification