Flow restriction system and method for patient infusion device
First Claim
1. A device for delivering fluid to a patient, comprising:
- A) a flow path including,an exit port assembly adapted to connect to a transcutaneous patient access tool, anda reservoir connected to the exit port assembly; and
B) a flow restriction system including,an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, anda flow restrictor positioned within the flow path between the air removal filter and the exit port assembly,wherein the flow restrictor of the flow restriction system comprises an outlet plug removably connected to the exit port assembly to prevent fluid from exiting the flow path through the exit port assembly and the air removal filter of the flow restriction system comprises at least a portion of the outlet plug allowing air to exit the flow path through the exit port assembly;
wherein the exit port assembly includes a transcutaneous patient access tool having a sharpened distal tip and the outlet plug is removably connected to the access tool; and
wherein the reservoir includes a side wall extending towards an outlet connected to the exit port assembly, a plunger movably received within the side wall of the reservoir for forcing fluid through the outlet upon moving along the side wall, and wherein the device includes a dispenser for causing the plunger to move along the side wall of the reservoir, and a local processor connected to the dispenser and programmed to cause the dispenser to move the plunger based on flow instructions.
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Accused Products
Abstract
A device for delivering fluid, such as insulin for example, to a patient. The device includes a flow path having an exit port assembly adapted to connect to a transcutaneous patient access tool, and a reservoir connected to the exit port assembly. The device also includes a flow restriction system having an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, and a flow restrictor positioned within the flow path between the air removal filter and the exit port assembly. Among other features and advantages, the flow restriction system of the present invention allows the flow path of the fluid delivery device to be purged of air, or “primed” prior to operation, such that desired volumes of fluid can be accurately delivered by the device.
766 Citations
9 Claims
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1. A device for delivering fluid to a patient, comprising:
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A) a flow path including, an exit port assembly adapted to connect to a transcutaneous patient access tool, and a reservoir connected to the exit port assembly; and B) a flow restriction system including, an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, and a flow restrictor positioned within the flow path between the air removal filter and the exit port assembly, wherein the flow restrictor of the flow restriction system comprises an outlet plug removably connected to the exit port assembly to prevent fluid from exiting the flow path through the exit port assembly and the air removal filter of the flow restriction system comprises at least a portion of the outlet plug allowing air to exit the flow path through the exit port assembly; wherein the exit port assembly includes a transcutaneous patient access tool having a sharpened distal tip and the outlet plug is removably connected to the access tool; and wherein the reservoir includes a side wall extending towards an outlet connected to the exit port assembly, a plunger movably received within the side wall of the reservoir for forcing fluid through the outlet upon moving along the side wall, and wherein the device includes a dispenser for causing the plunger to move along the side wall of the reservoir, and a local processor connected to the dispenser and programmed to cause the dispenser to move the plunger based on flow instructions. - View Dependent Claims (2, 3, 4, 5)
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6. A device for delivering fluid to a patient, comprising:
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A) a flow path including, an exit port assembly adapted to connect to a transcutaneous patient access tool, and a reservoir connected to the exit port assembly; and B) a flow restriction system including, an air removal filter communicating with the flow path and allowing air to exit the flow path and preventing fluid from exiting the flow path, and a flow restrictor positioned within the flow path between the air removal filter and the exit port assembly, wherein the reservoir includes a side wall extending towards an outlet connected to the exit port assembly, a plunger movably received within the side wall of the reservoir for forcing fluid through the outlet upon moving along the side wall, and wherein the device includes a dispenser for causing the plunger to move along the side wall of the reservoir, and a local processor connected to the dispenser and programmed to cause the dispenser to move the plunger based on flow instructions, and the dispenser includes an elongated shape memory element connected to the local processor and 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 to the plunger such that the changeable length of the shape memory element causes the plunger to move along the side wall of the reservoir. - View Dependent Claims (7, 8, 9)
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Specification