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Syringe Infusion Pump

a technology of infusion pump and syringe, which is applied in the direction of piston pump, pump control, other medical devices, etc., can solve the problems of inaccuracy in the resultant flow rate and difficulty in measuring the force applied

Inactive Publication Date: 2013-05-23
NUMIA MEDICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent is about a syringe infusion pump that can be used with different size syringes. The pump includes a drive head that can apply force to the plunger of the syringe and a syringe barrel holder that fixes the syringe barrel in place. A force sensor is positioned to sense the force applied to the plunger by the drive head. The pump also has a plunger holder that automatically positions the plunger with the force sensor center, regardless of the size of the syringe. This design allows for easy use with different size syringes and ensures accurate infusion of fluids.

Problems solved by technology

The variance in the syringe center line with respect to the pushing surface has caused difficulties in measuring the force applied to the syringe which is used to estimate fluid pressure within the syringe.
The variance has also caused inaccuracy in the resultant flow rate because the syringe plunger has not been driven into the syringe barrel squarely.

Method used

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Examples

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Embodiment Construction

[0016]One embodiment of the present patent application provides a syringe infusion pump with a force sensor and a syringe holder. In this embodiment the syringe holder includes a syringe plunger holder and a syringe barrel holder. The syringe holder can include mechanisms that provide the syringe plunger axis and the syringe barrel axis automatically aligned with the force sensor for all sized syringes.

[0017]Syringe infusion pump 20 includes drive head 22, syringe barrel holder 24, motor 26, lead screw 28, and position sensing device 30, as shown in FIGS. 1 and 2.

[0018]Motor 26 turns lead screw 28 clockwise or counterclockwise to move drive head 22 toward or away from syringe barrel holder 24. Drive head 22 includes force sensor 32 against which plunger 36 of syringe 38 is positioned, as shown in FIGS. 3a-3c. Force sensor 32 can be one available from Strain Measurement Devices, Meriden, Conn. Plunger 36 is held in position against force sensor 32 by syringe plunger holder and syring...

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Abstract

One embodiment of the present patent application is a syringe infusion pump that includes a syringe, a syringe barrel holder, and a force sensor. The syringe includes a barrel and a plunger. The plunger has a plunger axis and the barrel has a barrel axis and a barrel diameter. The syringe is one of a plurality of syringes, each having a different barrel diameter. The force sensor is positioned for detecting a force along the barrel axis. The syringe holder provides the barrel axis automatically aligned with the force sensor for each syringe of the plurality of syringes.

Description

RELATED APPLICATION DATA[0001]This application is a continuation of U.S. Nonprovisional Patent Application Ser. No. 12 / 157,477, filed Jun. 11, 2008, entitled Syringe Infusion Pump, that claims the benefit of priority of U.S. Provisional Patent Application Ser. No. 60 / 934,236, filed Jun. 11, 2007, and titled Axially Centered Syringe Infusion Pump Drive Mechanism, which is incorporated by reference herein in its entirety.FIELD OF THE INVENTION[0002]The present invention generally relates to the field of infusion pumps. In particular, the present invention is directed to a drive mechanism for a syringe infusion pump.BACKGROUND[0003]Infusion pumps currently present in the market consist of two basic types, syringe infusion pumps and volumetric infusion pumps. Typically, syringe infusion pumps accept a range of syringe sizes, typically from 1 cc to 60 cc or more in volume from a variety of syringe manufacturers. Typically these devices use a motor under control of a microprocessor. A mot...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04B9/02
CPCA61M5/1456A61M5/16854F04B9/02A61M2209/082A61M2205/332
Inventor FLACHBART, ERIC JOHNWARING, CAYLE E.
Owner NUMIA MEDICAL TECH