Disposable injector device
First Claim
1. A single use injector device for injecting at least one parenteral medication into the body of a patient through a skin surface, the injector device operating by hand force, the injector device comprising:
- a plunger section including a plunger, the plunger having a longitudinal axis, a first end, and a second end;
a base, the base being generally tubular and having a plunger end and a nozzle end, the base having a cavity and an outer surface, the cavity having a nozzle end and a longitudinal axis, the longitudinal axis of the cavity being coincident with the longitudinal axis of the plunger, the plunger being located at least partially within the cavity, the plunger sliding within the cavity parallel to the longitudinal axis of the cavity;
snap means for resisting movement of at least a moving portion of the plunger section from an initial position toward the skin surface as the hand force is applied to the moving portion of the plunger section, the snap means releasing the moving portion of the plunger section abruptly as a snap point is reached, the moving portion of the plunger section moving rapidly toward the skin surface after the snap point is reached, the snap means not including a spring; and
injection means for injecting the medication, the motion of the moving portion of the plunger section toward the skin surface after the snap point is reached driving the parenteral medication through the skin surface and into the body of the patient.
5 Assignments
0 Petitions
Accused Products
Abstract
The present invention is a single use injector device for injecting parenteral medications which operates by hand force. The injector device has a plunger section and a base. As hand force is applied to a moving portion of the plunger section, break tabs or a snap ring resist its motion toward the patient'"'"'s skin surface. The break tabs or snap ring release abruptly as the hand force reaches a snap point. The motion of the moving portion then drives the medication through the skin surface and into the body of the patient. If the medication is in liquid form, the actual injection may be carried out through a hollow needle attached to the plunger section. Alternatively, the suddenly increased pressure of the medication at the snap point may be used to form a liquid jet for needleless injection. Part or all of the medication may be contained in a glass needle which dissolves in the body after injection. The injector device requires little training to use, reduces perceived pain, and improves injection safety.
307 Citations
49 Claims
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1. A single use injector device for injecting at least one parenteral medication into the body of a patient through a skin surface, the injector device operating by hand force, the injector device comprising:
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a plunger section including a plunger, the plunger having a longitudinal axis, a first end, and a second end; a base, the base being generally tubular and having a plunger end and a nozzle end, the base having a cavity and an outer surface, the cavity having a nozzle end and a longitudinal axis, the longitudinal axis of the cavity being coincident with the longitudinal axis of the plunger, the plunger being located at least partially within the cavity, the plunger sliding within the cavity parallel to the longitudinal axis of the cavity; snap means for resisting movement of at least a moving portion of the plunger section from an initial position toward the skin surface as the hand force is applied to the moving portion of the plunger section, the snap means releasing the moving portion of the plunger section abruptly as a snap point is reached, the moving portion of the plunger section moving rapidly toward the skin surface after the snap point is reached, the snap means not including a spring; and injection means for injecting the medication, the motion of the moving portion of the plunger section toward the skin surface after the snap point is reached driving the parenteral medication through the skin surface and into the body of the patient. - 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, 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)
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Specification