Syringe pump

• US 9,295,778 B2
• Filed: 12/21/2012
• Issued: 03/29/2016
• Est. Priority Date: 12/21/2011
• Status: Active Grant

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Kamen, Dean, Gray, Larry B., Bodwell, Jesse T., Kerwin, John M., Baier, Michael J., van der Merwe, Dirk A.
• Primary Examiner(s): GILBERT, ANDREW M
• Application Number:
  US13/724,568
• Publication Number:
  US 20130184676A1
• Time in Patent Office: 1,194 Days
• US Class Current: 1/1
• CPC Class Codes: A61M 2005/14506 mechanically driven, e.g. spring or clockwork
• CPC Class Codes: A61M 2205/17 with redundant control systems
• CPC Class Codes: A61M 2205/3306 Optical measuring means
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 5/14216 Reciprocating piston type
• CPC Class Codes: A61M 5/14236 Screw, impeller or centrifugal type pumps
• CPC Class Codes: A61M 5/14526 the piston being actuated by fluid pressure
• CPC Class Codes: A61M 5/1454 spring-actuated, e.g. by a clockwork
• CPC Class Codes: A61M 5/1458 Means for capture of the plunger flange
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: G16H 20/17 delivered via infusion or injection
• CPC Class Codes: G16H 40/63 for local operation

Abstract

A pump for administering an agent to a patient includes a housing, a motor, a gearbox, a sensor, and a controller. The motor may be coupled to housing. The gearbox is operatively connected to said motor. The sensor senses a rotation of said motor. The controller acts to control operation of said motor and monitor the quantity of said agent delivered to said patient. The pump also includes a pump assembly such that the pump is configured such that the pump assembly may be interchangeable from a syringe pump assembly and a peristaltic pump assembly.

Claims

1. A syringe pump for administering an agent to a patient, the syringe pump comprising:

a housing;

a lead screw;

a sliding block assembly, said sliding block assembly comprising a threaded section configured for engaging and disengaging from the lead screw, wherein said sliding block assembly is positioned within said housing;

a plunger head assembly coupled to said sliding block assembly and operative to drive a plunger of a syringe into a barrel of said syringe;

first and second flange-clamp jaws disposed on the plunger head assembly and configured to grasp onto a plunger flange of the plunger of the syringe, wherein the first and second flange-clamp jaws are configured to actuate between an open position and a closed position;

a user-controlled actuator disposed on the plunger head assembly and configured for actuation by a user;

a shaft disposed within the plunger head assembly and operatively coupled to the user-controlled actuator, the shaft being elongated along a length thereby defining an axis along the length, wherein actuation of the user-controller actuator rotates the shaft around the axis; and

a cam disposed slideably around the shaft, wherein the cam includes an engagement surface disposed around the axis of the shaft.

2. The syringe pump of claim 1, further comprising:

at least one cam follower; and

at least one bias member, said bias member biasing the cam toward an end of the shaft, wherein the cam is slideable along the shaft,

wherein movement of the at least one cam follower along the cam overcomes the bias member and allows the shaft to operatively actuate the first and second flange-clamp jaw members.

3. The syringe pump of claim 2, wherein the cam, said at least one cam follower, and said at least one bias member are coupled to the shaft, said cam not rotatable with said shaft but displaceable along an axial dimension of said shaft, said at least one cam follower fixedly coupled to said shaft and rotatable with said shaft, and wherein rotation of said shaft causes movement of the at least one cam follower along said cam thereby displacing the cam along the axial dimension of said shaft.

4. The syringe pump of claim 2, wherein the bias member is configured to bias the cam such that the first and second flange-clamp jaws are biased to the closed position.

5. The syringe pump of claim 2, wherein the cam comprises at least one detent, each of the at least one detent being reached by one of the at least one cam follower, wherein the at least one detent is configured to form a dwell to hold the at least one cam followers at a predetermined position corresponding to the open position of the first and second flange-clamp jaws.

6. The syringe pump of claim 1, wherein the plunger head assembly further comprises a pressure sensor configured to monitor a pressure of an agent being dispensed from the syringe.

7. The syringe pump of claim 6, wherein the plunger flange of the syringe is held against the pressure sensor by the first and second flange-clamp jaws.

8. The syringe pump of claim 1, wherein the syringe pump further comprises a barrel flange clip, said barrel flange clip configured to retain a barrel flange of the syringe.

9. The syringe pump of claim 8, further comprising an optical sensor and a light source configured to detect a presence of said barrel flange.

10. The syringe pump according to claim 1, wherein the syringe pump is configured to communicate with a monitoring client.

11. The syringe pump according to claim 1, further comprising a potentiometer configured to monitor an actuation of the first and second flange-clamp jaws, wherein the potentiometer is configured to receive a D-shaped span of a parallel shaft operatively coupled in parallel to the shaft.

12. The syringe pump according to claim 1, further comprising at least one set of redundant sensors, the at least one set of redundant sensors configured such that if part of a set of the at least one set of redundant sensors is compromised, the syringe pump is configured to function in a fail operative mode for at least a duration of a therapy, the set of the at least one set of redundant sensors is configured to monitor a volume being infused.

13. The syringe pump according to claim 1, further comprising a cam follower configured to engage with the engagement surface of the cam, wherein the cam follower is coupled to the shaft to rotate with the shaft.

14. The syringe pump according to claim 13, further comprising another cam follower configured to engage with the engagement surface of the cam, wherein the cam follower and the another cam follower are about 180°

offset from each other along radial angles away from the axis of the shaft.

15. The syringe pump according to claim 13, further comprising a bias member coupled to the cam to bias the cam surface against the cam follower.

16. The syringe pump according to claim 15, further comprising a retaining ring disposed along the shaft and configured to retain the bias member along the shaft, the retaining ring is positioned at an end of the bias member opposite to an end of the bias member that engages with the cam.

17. The syringe pump according to claim 15, wherein the bias member is configured to bias the cam against the cam follower, wherein the engagement surface of the cam with the cam follower are configured such that the spring transfers a force from the spring, to the cam, and to the cam follower to thereby cause a rotational force on the shaft.

18. The syringe pump according to claim 1, wherein the user-controlled actuator is a knob operatively coupled to the shaft.

19. The syringe pump according to claim 1, wherein actuation of the shaft actuates the first and second flange-clamp jaws.

20. The syringe pump according to claim 1, wherein the cam further comprises an ear disposed on an end of the cam on a side away from the shaft, wherein the ear is configure for sliding engagement with a track to prevent the cam from rotating around the axis of the shaft.

21. The syringe pump according to claim 1, wherein the engagement surface includes a detent configured to receive a cam within the detent to thereby prevent rotation of the shaft without a predetermined amount of torque being applied to shaft to overcome a dwell of the cam within the detent.

22. The syringe pump according to claim 21, wherein the user-controlled actuator is a knob operatively coupled to the shaft, wherein the knob is configured to be retained at a predetermined rotational position when the cam is disposed within the detent.

23. The syringe pump according to claim 1, further comprising another shaft coupled to the sliding block assembly and configured to engage and disengage the threaded section with the lead screw with rotation of the another shaft, wherein the shaft is operatively coupled to the another shaft such that rotation of the shaft operatively rotates the another shaft.

24. The syringe pump according to claim 1, wherein the first and second flange-clamp jaws have first and second engagement surfaces, respectively, configured to engage with the plunger flange of the plunger of the syringe, wherein the first and second flange-clamp jaws are configured to actuate toward and away from each other such that the first and second engagement surfaces remain parallel to each other.