Syringe Pump, and Related Method and System

Patent metadata

Field	Value
Publication number	US-2017333623-A1
Application number	US-201715673814-A
Country	US
Kind code	A1
Filing date	Aug 10, 2017
Priority date	Dec 21, 2011
Publication date	Nov 23, 2017
Grant date	—

Abstract

A method for discharging fluid from a syringe and for mitigating occlusion conditions includes actuating the plunger of a syringe into a barrel. The method monitors fluid pressure within the barrel of the syringe and determines that an occlusion exists when the fluid pressure exceeds a predetermined threshold. The method actuates the plunger out of the barrel by a predetermined amount in response to the detected occlusion and actuates the plunger of the syringe into the barrel until a measured fluid pressure within the barrel of the syringe exceeds another predetermined threshold.

First claim

What is claimed is:

1 . A syringe pump comprising:
a body; a motor; a lead screw operatively coupled to the motor, wherein the motor is configured to actuate the lead screw; a linear cam moveable between an extended position and a retracted position; first and second half-nut arms pivotally coupled together, each having first and second ends, wherein the second ends of the first and second half-nut arms are configured to engage with the linear cam such that actuation of the linear cam toward the extended position causes the second ends of the first and second half-nut arms to pivotally approach each other to engage the lead screw.

2 . The syringe pump according to claim 1 , wherein:
the linear cam includes a concave surface, the first and second half-nut arms are pivotally coupled together via a pivot, the second ends of the first and second half-nut arms are positioned to engage with the concave surface of the linear cam, and actuation of the linear cam to the extended position causes the second ends of the first and second half-nut arms to move toward each other by pivoting along the pivot thereby causing the first ends of the first and second half-nut arms to engage with the lead screw.

3 . The syringe pump according to claim 1 , further comprising a spacer coupled to one of the first and second half-nut arms.

4 . The syringe pump according to claim 1 , further comprising a pivot pin configured to provide the pivotal coupling between the first and second half-nut arms.

5 . The syringe pump according to claim 1 , wherein the linear cam includes two ramping surfaces configured to engaged with the second ends of the first and second half-nut arms.

6 . The syringe pump according to claim 1 , further comprising a bias member configured to bias the second ends of the first and second half-nut arms away from each other.

7 . The syringe pump according to claim 6 , wherein the bias member is a spring.

8 . The syringe pump according to claim 1 , further comprising a plunger head assembly.

9 . The syringe pump according to claim 8 , wherein the plunger head assembly includes a user actuator operatively coupled to the linear cam to actuate the linear cam toward and away from a half-nut assembly.

10 . The syringe pump according to claim 1 , further comprising a plunger head assembly, the plunger head assembly comprising:
a dial having a first position and a second position, wherein the dial is configured to actuate between the first position and the second position; a plunger tube configured to slideably engage with the body; and a plunger head operatively coupled to the plunger tube.

11 . The syringe pump according to claim 10 , further comprising a shaft operatively coupled to the dial, wherein the shaft and the dial are configured such that actuation of the dial actuates the shaft.

12 . The syringe pump according to claim 11 , further comprising a cam coupled to the shaft.

13 . The syringe pump according to claim 12 , further comprising a rocker arm pivotally coupled to the plunger head assembly, the rocker arm having a cam follower configured to engage the cam.

14 . The syringe pump according to claim 13 , further comprising a pivotable jaw member operatively coupled to the rocker arm.

15 . The syringe pump according to claim 13 , further comprising:
a first gear coupled to the rocker arm and a pivotable jaw member; and a second gear coupled to another pivotable jaw member, wherein the first and second gears are configured to engage each other, wherein the pivotable jaw members are configured to grasp onto a syringe plunger flange.

16 . The syringe pump according to claim 15 , wherein the cam and the rocker arm are configured such that additional actuation of the dial toward the second position when the pivotable jaw members grasp onto the syringe plunger flange causes the cam follower to disengage from the cam.

17 . The syringe pump according to claim 15 , further comprising a bias member configured to urge the cam follower of the rocker arm toward the cam.

18 . The syringe pump according to claim 15 , wherein the cam includes a detent configured to interface with the rocker arm such that the cam is held in the first position until a predetermined amount of torque is applied to the dial to urge the dial toward the second position.

19 . The syringe pump according to claim 1 , wherein a plunger head includes a shaft having a rod actuator coupled thereto.

20 . The syringe pump according to claim 1 , wherein a plunger tube includes a rod, wherein the rod is coupled via a link within a plunger head.

21 . The syringe pump according to claim 1 , wherein a rod is operatively coupled to the linear cam.

22 . The syringe pump according to claim 1 , wherein the first ends of the first and second half-nut arms each includes threads configured to engage the lead screw when the second ends of the first and second half-nut arms are proximal to one another.

23 . The syringe pump of claim 1 , wherein a plunger head assembly comprises a pressure sensor for monitoring a pressure of the agent being dispensed from the syringe.

24 . The syringe pump of claim 23 , wherein a plunger flange of the syringe is held against the pressure sensor.

25 . 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.

26 . The syringe pump of claim 25 , wherein the barrel flange clip comprises an optical sensor and a light source configured to detect a presence of the barrel flange, said light source obscured in the presence of said barrel flange.

27 . A syringe pump comprising:
a body; a motor; a lead screw operatively coupled to the motor, wherein the motor is configured to actuate the lead screw; a linear cam moveable between an extended position and a retracted position; first and second half-nut arms pivotally coupled together, each having first and second ends, wherein the second ends of the first and second half-nut arms are configured to engage with the linear cam such that actuation of the linear cam toward the extended position causes the second ends of the first and second half-nut arms to pivotally approach each other to engage the lead screw; and at least one processor operatively coupled to the motor and configured to control the rotation of the motor to thereby control actuation of a plunger head assembly, the at least one processor is also operatively coupled to a force sensor to receive a measured force therefrom, wherein the at least one processor is configured to:
receive a target flow rate of the syringe loaded on the syringe pump;
determine a therapy actuation speed corresponding to the target flow rate;
command the motor to actuate the plunger of the syringe out of the barrel at a first predetermined speed until a force sensor coupled to the plunger measures a force that is less than a first predetermined force threshold or the plunger travels out of the barrel by a first predetermined distance;
command the motor to actuate the plunger of the syringe into the barrel at a second predetermined speed greater than the therapy actuation speed until the force sensor coupled to the plunger measures a force that exceeds a second predetermined threshold or the plunger travels into the barrel by a second predetermined d

Assignees

• Deka Products Lp

Inventors

• Kamen Dean
• Gray Larry B
• Bodwell Jesse T
• Kerwin John M
• Baier Michael J
• Van Der Merwe Dirk A
• Fichera Stephen L
• Thurber Jonathan R
• Desch Martin D

Classifications

• A61M2205/12

  with interchangeable cassettes forming partially or totally the fluid circuit · CPC title

• A61M2205/18

  with alarm · CPC title

• A61M2205/3317

  Electromagnetic, inductive or dielectric measuring means · CPC title

• A61M2209/082

  Mounting brackets, arm supports for equipment · CPC title

• A61M5/1456

  with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir · CPC title