SELF-COMPENSATING CHUCKING DEVICE FOR INFUSION PUMP SYSTEMS

• US 20170165414A1
• Filed: 12/14/2015
• Published: 06/15/2017
• Est. Priority Date: 12/14/2015
• Status: Active Grant

• Current Assignee: Carefusion 303 Incorporated (Becton, Dickinson & Co)
• Original Assignee: Carefusion 303 Incorporated (Becton, Dickinson & Co)
• Inventors: SCHIEVE, Eric W.
• Granted Patent: US 11,045,599 B2
• Time in Patent Office: Days
• CPC Class Codes: A61M 2005/14264 with means for compensating influence from the environment
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14228 with linear peristaltic action, i.e. comprising at least three pressurising members or a helical member
• CPC Class Codes: A61M 5/14244 adapted to be carried by the patient, e.g. portable on the body
• CPC Class Codes: A61M 5/158 Needles for infusions; Accessories therefor, e.g. for inserting infusion needles, or for holding them on the body

Abstract

A self-compensating chucking device may be provided. The chucking device may form a portion of a latching door handle of a door of an infusion pump. The door and a housing of the infusion pump may form a clam-shell clamp that secures infusion tubing to pumping mechanisms of the infusion pump. The latching door handle may include a latching door mechanism that includes a tapered pin. The tapered pin may extend through an outer portion of a door housing, an opening in a handle of the door, and into an opening in an inner portion of the door housing. The opening in the handle of the door may have a tapered inner surface that corresponds to the taper the tapered pin to form the chucking device. The pin may include a groove configured to accept an E-clip that retains the tapered pin within the door housing.

Claims

1. An infusion pump, comprising:

a housing;

at least one pumping mechanism; and

a pivoting door configured to close and latch to secure infusion tubing to the at least one pumping mechanism, wherein the pivoting door comprises;

a handle having recess and an opening in the recess;

a door housing having an inner portion and an outer portion; and

a tapered pin that extends through an opening in the outer portion, a co-aligned opening in the recess of the handle, and a co-aligned opening in the inner portion.

2. The infusion pump of claim 1, wherein the opening in the recess of the handle comprises a tapered opening having a tapered inner surface with a taper that corresponds to a taper of the tapered pin.

3. The infusion pump of claim 2, wherein the tapered pin comprises a tapered portion and a cylindrical portion and wherein the cylindrical portion is disposed within the opening in the outer portion of the door housing.

4. The infusion pump of claim 3, wherein the tapered portion of the tapered pin is partially disposed in the opening in the recess of the handle and extends from the opening in the recess of the handle into the recess.

5. The infusion pump of claim 4, wherein the tapered pin further comprises a groove disposed between the cylindrical portion and the tapered portion.

6. The infusion pump of claim 5, further comprising an E-clip retainer engaged in the groove that provides a mechanical stop that prevents the tapered pin from backing out of door housing.

7. The infusion pump of claim 6, wherein the tapered pin comprises a wear-relief chamfer adjacent an edge of the opening in the recess of the handle.

8. The infusion pump of claim 7, further comprising an air gap between an end of the tapered pin and a bottom of the opening in the inner portion of the door housing.

9. The infusion pump of claim 8, further comprising a washer disposed between the E-clip retainer and an inner wall of the outer portion of the housing.

10. The infusion pump of claim 1, wherein the tapered pin comprises a tapered portion having a taper of approximately two degrees.

11. The infusion pump of claim 10, wherein the opening in the recess of the handle comprises a corresponding taper of approximately two degrees.

12. The infusion pump of claim 1, wherein the handle comprises a sintered steel handle and wherein the tapered pin comprises a relatively harder hardened steel pin.

13. The infusion pump of claim 12, wherein the handle comprises a hook portion, wherein the recess is disposed in the hook portion, and wherein the hook portion comprises a cam surface.

14. The infusion pump of claim 13, further comprising a boss disposed on the housing, the boss configured to engage with the cam surface of the hook portion of the handle to press the tapered pin into the opening in the recess in the hook portion when the cam surface is pressed against the boss by a closing force on the handle.

15. The infusion pump of claim 1, further comprising a threaded extraction hole in the tapered pin.

16. A latching door handle assembly for a door of an infusion pump, comprising:

a molded handle having a hook portion with a recess and a tapered opening in the recess; and

a tapered pin, wherein the tapered pin comprises;

a tapered portion configured to engage in the tapered opening; and

a groove configured to receive an E-clip disposed in the recess.

17. The latching door handle assembly of claim 16, further comprising a cam surface on the hook portion, wherein the cam surface is configured to transfer a force on the cam surface into a force that presses the tapered pin into the tapered opening.

18. The latching door handle assembly of claim 16, further comprising:

a torsion spring that extends around the tapered opening in the recess; and

a washer on the tapered pin; and

the E-clip disposed in the groove between the torsion spring and the washer.

19. A fluid infusion system, comprising:

an intravenous (IV) set having IV tubing; and

an IV pump having a pumping module and a door, wherein a pumping segment of the IV tubing is secured to the pumping module by the door, and wherein the door comprises;

a door housing having an outer portion, an inner portion, and an air gap between the outer portion and the inner portion;

a handle having a tapered opening disposed in the air gap; and

a latching door handle assembly that includes a tapered pin that extends through an opening in the outer portion, through the tapered opening in the air gap, and into a co-aligned opening in the inner portion.

20. The fluid infusion system of claim 19, wherein the latching door handle assembly further comprises:

a hook portion having a cam surface configured to engage a corresponding cam feature on the pumping module;

an E-clip retainer engaged with a recess on the tapered pin;

a washer disposed between the E-clip retainer and the outer portion of the door housing; and

a torsion spring disposed between the E-clip retainer and a portion of the handle.

21. The fluid infusion system of claim 20, wherein the tapered pin and the tapered opening are configured such that a door closing force on the door that is sufficient to overcome resistance from internal components of the IV pump that capture the IV tubing and to place the cam surface in alignment with the corresponding cam feature generates a lateral force along the tapered pin and tapered opening that pushes an outer tapered surface of the tapered pin into and along a tapered inner surface of the tapered opening causing chucking or binding.

22. The fluid infusion system of claim 21, wherein the tapered pin and the tapered opening are configured to continuously slide along a tapered inclined interface to compensate for wear and maintain a binding or chucking condition that absorbs slackness or looseness resulting from a gradual wear of the tapered opening by contact with the tapered pin.