Safety syringe needle device with interchangeable and retractable needle platform
First Claim
1. A syringe comprising:
- a hollow, axially elongated barrel having distal and proximal ends;
a hub carried by said barrel at its distal end;
a hollow needle releasably carried by said hub and having an end in communication with the interior of said barrel;
a plunger axially slidably received in said barrel through said proximal end thereof and having a thumb press at one end external to said barrel and a bung at an opposite end within the barrel engaging interior wall portions of the barrel;
an element carried by said opposite end of said plunger and engageable with said needle upon axial sliding movement of said plunger toward said distal end of the barrel;
said element in engagement with said needle effecting release of said needle from said hub and withdrawal of said needle into the barrel in response to axial sliding movement of said plunger away from the distal end of the barrel.
4 Assignments
0 Petitions
Accused Products
Abstract
The syringe includes a barrel, a plunger, and an adapter for mounting the needle in the distal end of the barrel. The adapter includes a protrusion projecting away from the needle end and into the barrel defining an annular space between the barrel and the protrusion. The plunger and protrusion have complementary surfaces whereby the plunger may grip the adapter for removal of the adapter into the interior of the barrel after use. These complementary surfaces afford initial resistance to further axial movement of the plunger toward the adapter, signalling the user that further axial pressure will permanently lock the plunger and adapter to one another whereby, upon application of full axial pressure on the plunger, the complementary surfaces of the plunger and adapter permanently lock to one another to enable joint unitary movement of the plunger and adapter together with the needle carried by the adapter into the barrel. The adapter includes vent passages communicating between the central passage through the adapter and the annular space whereby air can be vented from the barrel after receiving fluid within the barrel and prior to injection. Thus, the syringe may be oriented in a vertical position needle end uppermost with the vent passages forming the most superior portion of the barrel interior whereby air may be vented.
40 Citations
14 Claims
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1. A syringe comprising:
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a hollow, axially elongated barrel having distal and proximal ends; a hub carried by said barrel at its distal end; a hollow needle releasably carried by said hub and having an end in communication with the interior of said barrel; a plunger axially slidably received in said barrel through said proximal end thereof and having a thumb press at one end external to said barrel and a bung at an opposite end within the barrel engaging interior wall portions of the barrel; an element carried by said opposite end of said plunger and engageable with said needle upon axial sliding movement of said plunger toward said distal end of the barrel; said element in engagement with said needle effecting release of said needle from said hub and withdrawal of said needle into the barrel in response to axial sliding movement of said plunger away from the distal end of the barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14)
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11. A syringe comprising:
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a hollow, axially elongated barrel having distal and proximal ends; a hub carried by said barrel at its distal end; a hollow needle releasably carried by said hub and having an end in communication with the interior of said barrel; a plunger axially slidably received in said barrel through said proximal end thereof and having a thumb press at one end external to said barrel and a bung at an opposite end within the barrel engaging interior wall portions of the barrel; and an element carried by said opposite end of said plunger and engageable with said needle upon axial sliding movement of said plunger toward said distal end of the barrel; said element in engagement with said needle effecting release of said needle from said hub and withdrawal of said needle into the barrel in response to axial sliding movement of said plunger away from the distal end of the barrel; said hub and the distal end of the barrel being screwthreaded to one another.
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12. A syringe comprising:
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a hollow, axially elongated barrel having distal and proximal ends; a hub carried by said barrel at its distal end; a hollow needle releasably carried by said hub and having an end in communication with the interior of said barrel; a plunger axially slidably received in said barrel through said proximal end thereof and having a thumb press at one end external to said barrel and a bung at an opposite end within the barrel engaging interior wall portions of the barrel; and an element carried by said opposite end of said plunger and engageable with said needle upon axial sliding movement of said plunger toward said distal end of the barrel, said element including a plurality of tines engageable with said needle; said element in engagement with said needle effecting release of said needle from said hub and withdrawal of said needle into the barrel in response to axial sliding movement of said plunger away from the distal end of the barrel; said element and said needle being telescopically receivable one within the other to effect engagement therebetween.
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Specification