Double action infusion pump

Patent metadata

Field	Value
Publication number	US-2018296752-A1
Application number	US-201816018860-A
Country	US
Kind code	A1
Filing date	Jun 26, 2018
Priority date	Mar 11, 2013
Publication date	Oct 18, 2018
Grant date	—

Abstract

An infusion system includes a double action infusion pump. The pump includes a cylinder and a reciprocating piston received within the cylinder, the reciprocating piston separating a first pump chamber from a second pump chamber of the cylinder. A reciprocating motor is coupled with the reciprocating piston, and the first and second pump chambers alternate between filling and evacuating conditions with reciprocation of the reciprocating piston through operation of the reciprocating motor, and the speed of reciprocation is varied to provide a continuous output of fluid between the first and second pump chambers. A fluid source and a catheter are optionally coupled with the double action infusion pump. The catheter includes one or more infusion ports near a catheter distal portion, and the one or more infusion ports receive and expel the continuous output of fluid from the double action infusion pump.

First claim

The claimed invention is:

1 . A method of infusing fluid into a body lumen, the method comprising:
positioning an infusion catheter adjacent a target site within the body lumen; continuously outputting fluid from an infusion pump into the infusion catheter, wherein continuously outputting fluid includes:
moving a piston of the infusion pump through a first section of a chamber at a first speed, a second section of the chamber at a second speed, and a transition section of the chamber at a third speed, wherein the first, the second or both the first and second speeds are greater than the third speed; and
varying the first speed, the second spend and/or the third speed to provide the continuous output of fluid out of the pump.

2 . The method of claim 1 , wherein the piston has a first acceleration from the third speed to the first speed, and wherein the piston has a second acceleration from the third speed to the second speed.

3 . The method of claim 2 , wherein the first acceleration and the second acceleration are configured to provide the continuous output of fluid out of the pump.

4 . The method of claim 1 , wherein the first, second and third piston speeds correspond to a first output of fluid out of the pump, a second output of fluid out of the pump and a third output of fluid out of the pump, and wherein the first output, the second output or both the first and second outputs are greater than the third output.

5 . The method of claim 1 , wherein the first, second and third speeds are variable, and wherein the piston adjusts the first, second and/or third speeds in response to the output of fluid out of the pump.

6 . The method of claim 1 , wherein moving the piston through the first section further comprises filling the first section with fluid while simultaneously evacuating fluid from the second section.

7 . The method of claim 1 , wherein moving the piston through the second section further comprises filling the second section with fluid while simultaneously evacuating fluid from the first section.

8 . The method of claim 1 , wherein the piston separates the first section from the second section.

9 . The method of claim 1 , further comprising at least one inlet coupled to the first section, and at least one inlet coupled to the second section.

10 . The method of claim 9 , wherein the transition section spans a distance between the at least one inlet coupled to the first section and the at least one inlet coupled to the second section.

11 . The method of claim 10 , wherein the at least one inlet coupled to the first section and the at least one inlet coupled to the second section includes at least one unidirectional valve.

12 . The method of claim 1 , wherein the distal end region of the infusion catheter includes one or more fluid infusion ports, and wherein the continuous output of fluid is directed through the one or more infusion ports.

13 . A method of infusing fluid into a body lumen, the method comprising:
positioning an infusion catheter adjacent a target site within the body lumen, the infusion catheter including a distal end region and a proximal end region, the proximal end region coupled to an infusion pump, wherein the infusion pump includes:
a cylinder having a reciprocating piston disposed within the cylinder, the cylinder having an evacuation chamber, an infusion chamber and a transition section positioned between the evacuation chamber and the infusion chamber;
moving the piston through the chamber at a first speed, a second speed, and a third speed, wherein the first, the second or both the first and second speeds are greater than the third speed; accelerating the piston from the third speed to the first speed at a first acceleration; and accelerating the piston from the third speed to the second speed at a second acceleration, wherein the first acceleration and the second acceleration are configured to provide a continuous output of fluid out of the pump.

14 . The method of claim 13 , wherein moving the piston further comprises filling the infusion chamber with fluid while simultaneously evacuating fluid from the evacuation chamber.

15 . The method of claim 13 , wherein the first, second and third speeds are variable, and wherein the piston adjusts the first, second and/or third speeds in response to the output of fluid out of the pump.

16 . The method of claim 13 , further comprising at least one inlet coupled to the evacuation chamber, and at least one inlet coupled to the infusion chamber, and wherein the transition section spans a distance between the at least one inlet coupled to the evacuation chamber and the at least one inlet coupled to the infusion chamber.

17 . The method of claim 16 , wherein the at least one inlet coupled to the evacuation chamber and the at least one inlet coupled to the infusion chamber include at least one unidirectional valve.

18 . The method of claim 13 , wherein the distal end region of the infusion catheter includes one or more fluid infusion ports, and wherein the continuous output of fluid is directed through the one or more infusion ports.

19 . A method of infusing fluid into a body lumen, the method comprising:
positioning an infusion catheter adjacent a target site within the body lumen, the infusion catheter including a distal end region and a proximal end region, the proximal end region coupled to an infusion pump, wherein the infusion pump includes:
a cylinder having a first end, a second end and a transition region positioned between the first end and the second end; and
a reciprocating piston disposed within the cylinder, the cylinder having a first transition zone and a second transition zone;
moving the piston through the cylinder at a first speed, a second speed, and a third speed; accelerating the piston within the first transition zone from the third speed to the first piston speed at a first acceleration; accelerating the piston within the second transition zone from the third speed to the second piston speed at a second acceleration; varying the first acceleration and the second acceleration to maintain a continuous output of fluid out of the pump.

20 . The method of claim 19 , wherein the first, second and third speeds are variable, and wherein the piston adjusts the first, second and/or third speeds in response to the continuous output of fluid out of the pump.

Assignees

• Boston Scient Ltd

Inventors

• Bonnette Michael J
• Morris David B

Classifications

• A61M5/14212

  Pumping with an aspiration and an expulsion action · CPC title

• A61M5/1422 Primary

  with double acting or multiple pistons · CPC title

• F04B11/0041

  by piston speed control (F04B11/0058 takes precedence) · CPC title

• A61M2005/1403

  Flushing or purging · CPC title

• A61M5/14216

  Reciprocating piston type · CPC title