Syringe with safety retracting needle
First Claim
1. A safety device for use in injecting liquid into or withdrawing liquid from a patient and for thereafter protecting people from contact with portions of the device that have been within the patient;
- said device comprising;
a hollow needle for piercing such patient and for guiding and carrying such liquid into or out of the patient, said needle having a hollow shaft with at least one sharp end;
a syringe that includes;
a syringe barrel for containing a quantity of such liquid, anda syringe plunger disposed at least partially within the syringe barrel and adapted to be moved forward within the syringe barrel to drive such liquid out of the syringe barrel and through the hollow shaft into such patient;
means for securing the needle shaft to the syringe barrel, with the sharp end projecting from the syringe barrel; and
manually actuable means for releasing the securing means and for substantially permanently retracting the sharp end of the needle into the syringe and beyond reach of such people'"'"'s fingers;
wherein the plunger is relieved to permit retraction of the sharp end of the needle by the releasing and retracting means into a space within the syringe, while the plunger is disposed forward within the syringe barrel; and
wherein the releasing and retracting means are manually actuable by a simple unitary motion, of amplitude that is substantially shorter than the shaft of the needle.
2 Assignments
0 Petitions
Accused Products
Abstract
A hollow needle projects from the "forward" end of a syringe barrel or an adjacent auxiliary retraction barrel. After use to inject or withdraw liquid from a patient, the needle is released from the end of the barrel and retracted into the barrel. The barrel has an aperture big enough for the needle but too small for fingertips. The needle rides in a carrier block that slides in the barrel. Initially a manually releasable latch secures the block in the barrel against the forward end, with the sharp end of the needle protruding out through the aperture. The latch includes mutually interfering stop elements on the exterior of the block and interior of the barrel. After the injection or withdrawal of liquid, the person using the device withdraws the needle from the patient and manually triggers the latch by manipulating the plunger. A coiled spring drives the block rearward to retract the needle into the barrel. At the rear end of the barrel a stop halts the carrier block and needle to safely confine them. If no auxiliary barrel is present, the plunger is relieved to allow retention of the needle in the syringe, while the plunger is fully forward, to minimize bulk after retraction. In another form of the invention the front end of the plunger engages the rear end of the needle or carrier; pulling the plunger rearward pulls the needle into the syringe.
184 Citations
26 Claims
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1. A safety device for use in injecting liquid into or withdrawing liquid from a patient and for thereafter protecting people from contact with portions of the device that have been within the patient;
- said device comprising;
a hollow needle for piercing such patient and for guiding and carrying such liquid into or out of the patient, said needle having a hollow shaft with at least one sharp end; a syringe that includes; a syringe barrel for containing a quantity of such liquid, and a syringe plunger disposed at least partially within the syringe barrel and adapted to be moved forward within the syringe barrel to drive such liquid out of the syringe barrel and through the hollow shaft into such patient; means for securing the needle shaft to the syringe barrel, with the sharp end projecting from the syringe barrel; and manually actuable means for releasing the securing means and for substantially permanently retracting the sharp end of the needle into the syringe and beyond reach of such people'"'"'s fingers; wherein the plunger is relieved to permit retraction of the sharp end of the needle by the releasing and retracting means into a space within the syringe, while the plunger is disposed forward within the syringe barrel; and wherein the releasing and retracting means are manually actuable by a simple unitary motion, of amplitude that is substantially shorter than the shaft of the needle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- said device comprising;
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20. A safety device for use in injecting liquid into or withdrawing liquid from a patient and for thereafter protecting people from contact with portions of the device that have been within the patient;
- said device comprising;
a hollow needle for piercing such patient and for guiding and carrying such liquid into or out of the patient, said needle having a hollow shaft with at least one sharp end; a syringe that includes; a syringe barrel for containing a quantity of such liquid, and a syringe plunger disposed at least partially within the syringe barrel and adapted to be moved forward within the syringe barrel to drive such liquid out of the syringe barrel and through the hollow shaft into such patient; means for securing the needle shaft to the syringe barrel, with the sharp end projecting from the syringe barrel; and manually actuable means for releasing the securing means and for substantially permanently retracting the sharp end of the needle into the syringe and beyond reach of such people'"'"'s fingers; wherein the plunger is relieved to permit retraction of the sharp end of the needle by the releasing and retracting means into a space within the syringe, while the plunger is disposed forward within the syringe barrel. - View Dependent Claims (21, 22, 23, 24, 25, 26)
- said device comprising;
Specification