IP Library › Granted Patent US 12,288,604
Granted Patent B2
US 12,288,604 · App. 18/367,161 · Granted Apr 29, 2025

Peristaltic pump

Inventors: Dean Kamen (Bedford, NH); John M. Kerwin (Manchester, NH); Colin H. Murphy (Cambridge, MA); Christopher C. Langenfeld (Nashua, NH); Michael J. Slate (Merrimack, NH); Michael S. Place (Manchester, NH); Larry B. Gray (Merrimack, NH)
Assignee: DEKA PRODUCTS LIMITED PARTNERSHIP
G16H20/17A61M5/14228A61M5/16831F04B43/08F04B43/082F04B43/12F04B43/1261F04B49/00F04B49/065G01F1/666G06Q50/22G16H40/63G16H40/67G16H50/00A61M2005/16863F04B43/09F04B2205/09
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Quick Facts
Patent No.
US 12,288,604
App. No.
18/367,161
Filed
Sep 12, 2023
Granted
Apr 29, 2025
Kind
B2
Art Unit
3746
USPC
417/53
Abstract

A peristaltic pump having at least first, second, and third stages is provided. The peristaltic pump includes a plunger, inlet and outlet valves, a spring, and an actuator. The plunger actuates toward and away from a tube, the inlet valve is upstream of the plunger, the outlet valve is downstream of the plunger, the spring biases the plunger toward the tube, and the actuator mechanically engages and disengages from the plunger. In the first stage, the inlet valve is opened and the plunger is actuated from the tube, in the second stage, the inlet valve is closed, the plunger is actuated toward the tube, and the actuator is mechanically disengaged from the plunger, and in the third stage, the outlet valve is opened. In the third stage or in a fourth stage, the actuator actuates the plunger toward the tube to discharge fluid downstream past the outlet valve.

Claims (25)

1. A peristaltic pump, comprising:

at least one spring biased plunger configured to be biased toward a tube;

a first valve upstream of the at least one spring biased plunger; and

at least one actuator configured to transition the at least one spring biased plunger toward and away from the tube and to transition the first valve between an open state and a closed state, wherein the at least one actuator sequentially effects at least two pumping stages in a pumping cycle.

2. The peristaltic pump of claim 1 , wherein the at least one actuator comprises:

a cam shaft; and

at least one pinch-valve cam coupled to the cam shaft, wherein rotation of the cam shaft produces a valve sequence to effect the at least two pumping stages.

3. The peristaltic pump of claim 1 , wherein the at least two pumping stages comprises:

a first stage in which the first valve is open and the at least one spring biased plunger is moved away from the tube; and

a second stage in which the first valve is closed and the at least one spring biased plunger is moved toward the tube.

4. The peristaltic pump according to claim 1 , further comprising a second valve downstream of the at least one spring biased plunger, and wherein the at least two pumping stages further comprise:

a third stage in which the second valve is opened and the at least one actuator causes the at least one spring biased plunger to move toward the tube to discharge fluid downstream past the second valve.

5. The peristaltic pump according to claim 1 , wherein movement of the at least one actuator does not correspond to movement of the at least one spring biased plunger when the actuator is disengaged from the at least one spring biased plunger.

6. The peristaltic pump according to claim 4 , wherein the at least two pumping stages further comprise:

a fourth stage in which the second valve is opened first, and the least one spring biased plunger is moved toward the tube to effect discharging of liquid.

7. The peristaltic pump according to claim 6 , wherein the at least one actuator comprises:

a cam shaft; and

at least one pinch-valve cam coupled to the cam shaft, wherein rotation of the cam shaft produces a valve sequence to effect the at least two pumping stages, and wherein the at least one pinch-valve cam is configured to limit descent of the at least one spring biased plunger.

8. The peristaltic pump according to claim 3 , further comprising a second valve downstream of the at least one spring biased plunger wherein in the first stage, the second valve is closed.

9. The peristaltic pump according to claim 2 , further comprising:

a position sensor operatively coupled to the at least one spring biased plunger to determine a position of the at least one spring biased plunger.

10. The peristaltic pump according to claim 9 , further comprising a processor coupled to the position sensor to estimate fluid flow.

11. The peristaltic pump according to claim 10 , further comprising an electric motor operatively coupled to the at least one actuator, wherein application of a torque to the at least one actuator via the electric motor is configured to be adjusted based on the estimated fluid flow.

12. The peristaltic pump according to claim 1 , further comprising a spring that biases the at least one spring biased plunger toward the tube such that a biasing force applied to the tube by the spring biased plunger is produced by the spring.

13. The peristaltic pump according to claim 12 , wherein the actuator is configured to disengage from the at least one spring biased plunger to allow the spring to generate the biasing force.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 22, 2023
From: GRAY, LARRY B.; PLACE, MICHAEL S.; MURPHY, COLIN H.
To: DEKA PRODUCTS LIMITED PARTNERSHIP
Reel/Frame 064997/0023 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 15, 2023
From: KAMEN, DEAN; KERWIN, JOHN M; LANGENFELD, CHRISTOPHER C.; SLATE, MICHAEL J.
To: DEKA PRODUCTS LIMITED PARTNERSHIP
Reel/Frame 064914/0894 →
Continuity (21)
Continuation 17332153 · May 27, 2021
Continuation 16271046 · Feb 8, 2019
Continuation 15841961 · Dec 14, 2017
Continuation 14873515 · Oct 2, 2015
Continuation In Part 13723244 · Dec 21, 2012
Continuation In Part 13723235 · Dec 21, 2012
Continuation In Part 13723251 · Dec 21, 2012
Continuation In Part 13723242 · Dec 21, 2012
Continuation In Part 13724568 · Dec 21, 2012
Continuation In Part 13725790 · Dec 21, 2012
Continuation In Part 13723253 · Dec 21, 2012
Continuation In Part 13723239 · Dec 21, 2012
Continuation In Part 13723238 · Dec 21, 2012
Continuation In Part 13333574 · Dec 21, 2011
Continuation In Part PCTUS2011066588 · Dec 21, 2011
Provisional Application 61679117 · Aug 3, 2012
Provisional Application 61651322 · May 24, 2012
Provisional Application 61578658 · Dec 21, 2011
Provisional Application 61578649 · Dec 21, 2011
Provisional Application 61578674 · Dec 21, 2011
Related Publication 20230420101A1 · Dec 28, 2023
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