Vented, aspirating syringe
First Claim
1. A syringe assembly comprising:
- a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof;
a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough;
means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body;
an air permeable filter member extending across said passageway adjacent said one end of said plunger;
a handle movably connected to the plunger to move the plunger within said tubular body; and
said handle and plunger having mutually interengaging means forming valve means extending across said passageway between said filter member and said open end of said tubular body for selectively permitting the passage of air through said passageway, said valve means including relatively movable parts on said handle and plunger.
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Accused Products
Abstract
A syringe comprises a main tubular body, the body being open at one end and receiving a hypodermic needle at the other end, and a plunger, one end of the plunger extending into the body, through the open end thereof, the plunger having a longitudinal passageway therein permitting air flow therethrough. A fluid-tight seal is formed between the outside surface of the plunger and the inside surface of the syringe body. An air permeable filter member extends across the first end of the plunger, in the passageway, whereby the body can fill with blood, causing the air in the body to pass through the filter member to the open end of the body. The blood does not flow through the filter. A valve extends across the passageway and allows the syringe to be used to aspirate in the absence of natural blood pressure.
69 Citations
17 Claims
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1. A syringe assembly comprising:
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a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof; a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough; means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body;
an air permeable filter member extending across said passageway adjacent said one end of said plunger;a handle movably connected to the plunger to move the plunger within said tubular body; and said handle and plunger having mutually interengaging means forming valve means extending across said passageway between said filter member and said open end of said tubular body for selectively permitting the passage of air through said passageway, said valve means including relatively movable parts on said handle and plunger. - View Dependent Claims (2, 5, 6, 7, 8)
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3. A syringe assembly comprising:
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a tubular body open at one end and being adapted to receive a hypodermic needle at the other end thereof; a plunger, one end of which is adapted for insertion into said tubular body through said open end, said plunger having a longitudinal passageway for air flow therethrough; means for forming a fluid-tight seal between the outside surface of said plunger and the inside surface of said tubular body;
an air permeable filter member extending across said passageway adjacent said one end of said plunger;a handle connected to move the plunger within said tubular body; and
said handle and plunger having mutually interengaging means forming valve means extending across said passageway between said filter member and said open end of sad tubular body for selectively permitting the passage of air through said passageway, said plunger (comprises) comprising a sealing cylinder,said cylinder having an apertured end cap, said handle extending through the aperture of said end cap and having an enlarged end captured within said sealing cylinder, said end cap and enlarged handle end forming said valve means. - View Dependent Claims (4)
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9. A plunger for use with a conventional syringe comprising:
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an elongated body having a longitudinal passageway therein for permitting air flow therethrough; an air permeable filter member extending across said passageway adjacent one end of said body; an elongated handle movably mounted to said body; and said body and handle having mutually interengaging means forming valve means extending across said passageway between said member and the other end of said body for selectively permitting the passage of air through said passageway, said mutually interengaging means comprising a first valve part on said body and a second valve part on said handle, said valve parts being movable to and from engagement with one another in response to motion of the handle. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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10. A plunger for use with a conventional syringe comprising:
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an elongated body having a longitudinal passageway therein for permitting air flow therethrough; an air permeable filter member extending across said passageway adjacent one end of said body; an elongated handle; and said body and handle having mutually interengaging means forming valve means extending across said passageway between said member and the other end of said body for selectively permitting the passage of air through said passageway, said body having an apertured end cap, said handle extending through the aperture of said end cap and having an enlarged end captured within said body, said end cap and enlarged handle end forming said valve means. - View Dependent Claims (11)
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Specification