Cannula insertion set with safety retracting needle
First Claim
1. A safety device for use in inserting a cannula into a patient and for thereafter protecting people from contact with portions of the device that have been within the patient;
- said device comprising;
a needle for piercing such patient and for guiding and carrying such a cannula into place within such patient, said needle having a shaft with at least one sharp end;
a hollow handle adapted to enclose at least the sharp end of the needle beyond reach of such people'"'"'s fingers;
means for securing the shaft to the handle, with the sharp end projecting from the handle; and
means for releasing the securing means and for substantially permanently retracting the sharp end of the needle into the handle and beyond reach of such people'"'"'s fingers;
said releasing and retracting means being manually actuable by a simple unitary motion, of amplitude that is substantially shorter than the shaft of the needle.
1 Assignment
0 Petitions
Accused Products
Abstract
A cannula insertion needle projects from the "forward" end of a hollow handle. After use to start a cannula, the needle is released from the end of the handle and its sharp end retracted into the handle, beyond reach. Preferably the handle has an aperture big enough for the needle but too small for fingertips. In one preferred form of the invention, the needle rides in a carrier block that slides inside the handle. Initially the block is secured in the handle against the forward end, with the sharp end of the needle protruding outward through the aperture. A manually releasable latch holds the block in this position. The latch mechanism includes mutually interfering stop elements on the exterior of the block and interior of the handle. After the cannula is in place, the person using the device withdraws the needle from the patient and manually triggers the carrier-block latch by squeezing or rotating one of the stop elements out of engagement with the other. Then a coiled spring drives the block rearward to retract the needle into the handle. At the rear end of the handle a stop halts the carrier block and needle so that they are safely confined within the handle. A standard-size tube fitting on the rear of the handle and a hollow needle permit liquid flow to or from the patient through the handle temporarily.
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Citations
20 Claims
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1. A safety device for use in inserting a cannula into a patient and for thereafter protecting people from contact with portions of the device that have been within the patient;
- said device comprising;
a needle for piercing such patient and for guiding and carrying such a cannula into place within such patient, said needle having a shaft with at least one sharp end; a hollow handle adapted to enclose at least the sharp end of the needle beyond reach of such people'"'"'s fingers; means for securing the shaft to the handle, with the sharp end projecting from the handle; and means for releasing the securing means and for substantially permanently retracting the sharp end of the needle into the handle and beyond reach of such people'"'"'s fingers; said releasing and retracting means being 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)
- said device comprising;
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11. A safety device for use in inserting an intravenous cannula into a patient'"'"'s blood vessel 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 a cannula into place within such patient'"'"'s blood vessel, said needle having a hollow shaft with at least one sharp end; a hollow handle that defines an aperture which is small compared with such people'"'"'s fingers but large enough for passage of the needle, and that is otherwise adapted to enclose at least the sharp end of the needle; a block fixed to and extending from the needle, and restrained within the handle with the sharp end of the needle projecting out of the handle through the aperture, and adapted for motion within the handle to withdraw the needle into the handle; and a trigger mechanism, actuable from outside the handle for releasing the block, and including positive biasing means for forcibly moving the block within the handle to substantially permanently retract the sharp end of the needle into the handle and beyond reach of such people'"'"'s fingers. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
- said device comprising;
Specification