Components and Methods For Patient Infusion Device
A fluid delivery device including a housing, a reservoir positioned within the housing, and a transcutaneous access tool positioned within the housing and including, a cannula in fluid communication with the reservoir and linearly moveable along an axis of the transcutaneous access tool through a port in a wall of the housing, a deployment member secured to the cannula and movable along the axis of the transcutaneous access tool against the wall of the housing defining the port, and an annular seal coaxially positioned about the cannula and positioned between the deployment member and the wall of the housing defining the port, so that the seal provides a substantially fluid-tight seal between the deployment member and the wall of the housing when the deployment member is moved against the wall of the housing.
1 . A fluid delivery device comprising:
a housing;
a reservoir positioned within the housing; and
a transcutaneous access tool positioned within the housing and including,
a cannula in fluid communication with the reservoir and linearly moveable along an axis of the transcutaneous access tool through a port in a wall of the housing,
a deployment member secured to the cannula and movable along the axis of the transcutaneous access tool against the wall of the housing defining the port, and
an annular seal coaxially positioned about the cannula and positioned between the deployment member and the wall of the housing defining the port, so that the seal provides a substantially fluid-tight seal between the deployment member and the wall of the housing when the deployment member is moved against the wall of the housing.
2 . A device according to claim 1 , wherein the annular seal is secured to the deployment member.
3 . A device according to claim 1 , wherein the annular seal comprises at least one of an elastomer and rubber.
4 . A device according to claim 1 , wherein the cannula comprises a flexible cannula.
5 . A device according to claim 1 , wherein the transcutaneous access tool further comprises a deployment spring biasing the deployment member towards the port in the wall of the housing.
6 . A device according to claim 5 , wherein the transcutaneous access tool further includes a deployment latch mechanism maintaining the deployment member against the bias force of the deployment spring.
7 . A device according to claim 6 , wherein the deployment latch mechanism comprises:
a movable latch positioned in the path of the deployment member to maintain the deployment member against the bias force of the deployment spring; and
an elongated shape memory element having a changeable length decreasing from an uncharged length to a charged length when at least one charge is applied to the shape memory element, the shape memory element connected between the latch and a fixed portion of the device such that the changeable length of the shape memory element decreasing from an uncharged length to a charged length causes the latch to be moved out of the path of the deployment member.
8 . A device according to claim 1 , wherein the cannula of the transcutaneous access tool comprises a first cannula and the transcutaneous access tool further includes:
a second cannula disposed within the lumen of the first cannula; and
a retraction member secured to the second cannula and movable along the axis of the transcutaneous access tool with respect to the deployment member.
9 . A device according to claim 8 , wherein the transcutaneous access tool further comprises a retraction spring biasing the retraction member away from the deployment member.
10 . A device according to claim 8 , wherein the first cannula is flexible and the second cannula is rigid.
11 . A device according to claim 1 , further comprising an outlet plug removably connected to a distal end of the cannula.
12 . A device according to claim 11 , wherein the outlet plug includes an air removal filter allowing air to exit the cannula.
13 . A device according to claim 11 , wherein the port in the wall of the housing comprises an internal exit port and the housing further includes an external exit port for the flexible cannula and a sterilization access port adjacent the external exit port.