Cannula insertion device and related methods
First Claim
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1. A cannula insertion device comprising:
- a housing defining an opening for receiving therethrough a cannula and further defining a channel;
a cannula forming a lumen, the cannula adapted for sliding movement within the housing from a retracted position to an extended position in which the cannula extends into a body tissue, wherein;
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; and
when the cannula is in the extended position, the lumen is in fluidic communication with the channel to deliver a fluid from the channel through the cannula into the body tissue;
a plunger for driving the cannula from the refracted position to the extended position;
a needle disposed in the lumen when the cannula is in the retracted position;
a ramp body comprising a ramp surface in sliding contact with the plunger; and
a drive spring, wherein the drive spring applies a torsion force to the ramp body for driving the cannula from the retracted position to the extended position.
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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.
223 Citations
17 Claims
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1. A cannula insertion device comprising:
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a housing defining an opening for receiving therethrough a cannula and further defining a channel; a cannula forming a lumen, the cannula adapted for sliding movement within the housing from a retracted position to an extended position in which the cannula extends into a body tissue, wherein; 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; and when the cannula is in the extended position, the lumen is in fluidic communication with the channel to deliver a fluid from the channel through the cannula into the body tissue; a plunger for driving the cannula from the refracted position to the extended position; a needle disposed in the lumen when the cannula is in the retracted position; a ramp body comprising a ramp surface in sliding contact with the plunger; and a drive spring, wherein the drive spring applies a torsion force to the ramp body for driving the cannula from the retracted position to the extended position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 17)
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11. A method of inserting a cannula into a body tissue, the method comprising the steps of:
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providing a housing defining an opening for receiving therethrough a cannula and further defining a channel; providing a ramp body comprising a ramp m surface; providing a cannula forming a lumen, the cannula adapted for sliding movement within the housing from a retracted position to an extended position in which the cannula extends into the body tissue; providing a needle disposed in the lumen when the cannula is in the retracted position; providing a plunger for driving the cannula, wherein the plunger is in sliding contact with the ramp surface; and rotating the ramp body so as to drive the cannula from the retracted position, in which the lumen is located remotely from the channel and the channel is in fluidic communication with the opening, to the extended position, in which the lumen is in fluidic communication with the channel to deliver a fluid from the channel through the cannula into the body tissue. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification