MEANS FOR USING SINGLE FORCE SENSOR TO SUPPLY ALL NECESSARY INFORMATION FOR DETERMINATION OF STATUS OF MEDICAL PUMP

• US 20090143726A1
• Filed: 06/27/2008
• Published: 06/04/2009
• Est. Priority Date: 10/16/2002
• Status: Abandoned Application

• Current Assignee: Abbott Laboratories
• Original Assignee: Abbott Laboratories
• Inventors: Bouton, Chad E., Radcliff, Dale M., Fortney, Clark E., Nelson, Steven R.
• Application Number:
  US12/163,440
• Publication Number:
  US 20090143726A1
• Time in Patent Office: Days
• US Class Current: 604/67
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2205/332 Force measuring means
• CPC Class Codes: A61M 2205/3331 Pressure; Flow
• CPC Class Codes: A61M 5/14224 Diaphragm type
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626

Abstract

A medical pump, for use with a cassette having a pumping chamber, includes a pumping element with a piston slider assembly which intermittently pressurizes the pumping chamber during a pumping cycle and has a piston head connected to a main body with a single pressure sensor positioned there between. A camshaft is associated with the pumping element, an inlet control element, and an outlet control element for closing the pumping chamber to flow when the pumping chamber is pressurized. A processing unit receives pressure and position data from the pressure sensor and a position sensor associated with the pumping element, and processes this data to determine the operating condition of the pump. The operating conditions determined include: blocked fluid flow, no fluid in the line, no cassette associated with the pump, proper pump priming, or proper valve sealing.

Claims

1. A medical pump for use with a cassette having a pumping chamber, comprising:

a pumping element adapted to forcibly press on and intermittently pressurize the pumping chamber during a pumping cycle, wherein the pumping element includes a piston head connected to a main body;

means for closing the pumping chamber to flow during at least a portion of the pump cycle when the pumping chamber is pressurized by the pumping element; and

a single pressure sensor operatively connected to the pumping element to detect the pressure exerted by the pumping element on the pumping chamber, the single pressure sensor rigidly connected in a force bearing relationship to at least one of the piston head and the main body.