Cannula insertion device and related methods
First Claim
Patent Images
1. A cannula insertion device comprising:
- a housing comprising a base wall;
a cannula disposed within the housing;
a needle attached to a needle holder, wherein the needle is configured to be disposed in the cannula;
a compressed spring disposed between the needle holder and the base wall and coupled to and surrounding the needle when the needle is disposed in the cannula and the cannula is in a retracted position, the compressed spring having a compressed length;
a plunger comprising a recess, wherein the plunger is adapted to advance the cannula with the needle from the retracted position to an extended position; and
a release apparatus adapted to release the compressed spring when the plunger reaches the extended position to expand the compressed spring from the compressed length to an extended length and withdraw the needle automatically from the cannula and force the needle holder into the recess.
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Abstract
A cannula insertion device includes a housing defining an opening for receiving therethrough a cannula and further defining a channel, and a cannula forming a lumen, the cannula adapted for sliding movement within the housing from a retracted position to an extended position. When the cannula is in the retracted position, the lumen is located remotely from the channel and the channel is in fluidic communication with the opening. When the cannula is in the extended position, the lumen is in fluidic communication with the channel.
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Citations
18 Claims
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1. A cannula insertion device comprising:
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a housing comprising a base wall; a cannula disposed within the housing; a needle attached to a needle holder, wherein the needle is configured to be disposed in the cannula; a compressed spring disposed between the needle holder and the base wall and coupled to and surrounding the needle when the needle is disposed in the cannula and the cannula is in a retracted position, the compressed spring having a compressed length; a plunger comprising a recess, wherein the plunger is adapted to advance the cannula with the needle from the retracted position to an extended position; and a release apparatus adapted to release the compressed spring when the plunger reaches the extended position to expand the compressed spring from the compressed length to an extended length and withdraw the needle automatically from the cannula and force the needle holder into the recess. - View Dependent Claims (2, 3, 4, 5, 6, 16, 17, 18)
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7. A method of inserting a cannula into a body, the method comprising the steps of:
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applying a force with a drive spring to advance the cannula from a retracted position to an extended position; advancing the cannula with a needle disposed therein from the retracted position, in which the needle is attached to a needle holder and is surrounded by a compressed spring, to the extended position using a plunger having a recess therein; and withdrawing the needle automatically from the cannula by releasing the compressed spring such that it expands from a compressed length to an extended length when the plunger reaches the extended position, which forces the needle holder into the recess. - View Dependent Claims (8, 9, 10)
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11. A patch pump comprising:
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a housing defining an opening for receiving a cannula therethrough, and further defining a channel; and a cannula insertion device comprising; a cannula; a needle attached to a needle holder, wherein the needle is configured to be disposed in the cannula; a compressed spring coupled to and surrounding the needle when the needle is disposed in the cannula and the cannula is in a retracted position, the compressed spring having a compressed length; a plunger comprising a recess, wherein the plunger is adapted to advance the cannula with the needle from the retracted position to an extended position; and a release apparatus adapted to release the compressed spring when the plunger reaches the extended position to expand the compressed spring from the compressed length to an extended length and withdraw the needle automatically from the cannula and force the needle holder into the recess. - View Dependent Claims (12, 13, 14, 15)
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Specification