Safety interlock system for medical fluid pumps

• US 5,201,711 A
• Filed: 06/07/1991
• Issued: 04/13/1993
• Est. Priority Date: 09/30/1987
• Status: Expired due to Term

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Medical Company (Medtronic Plc)
• Inventors: Pasqualucci, Joseph, Schweitzer, Frederick F.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): Lewis, William W.
• Application Number:
  US07/713,554
• Time in Patent Office: 676 Days
• Field of Search: 604/30, 604/49, 604/67, 604/151, 604/152, 604/153, 604/150, 417/63, 417/360, 417/474-477
• US Class Current: 604/153
• CPC Class Codes: A61M 2202/0482 Enteral feeding product
• CPC Class Codes: A61M 2205/14 Detection of the presence or absence of a tube, a connector or a container in an apparatus
• CPC Class Codes: A61M 5/142 Pressure infusion, e.g. using pumps
• CPC Class Codes: A61M 5/14232 Roller pumps

Abstract

A medical fluid delivery set is provided with a magnetic field source in the region of its mounting to a fluid flow control apparatus. The flow control apparatus includes a magnetic field sensitive switching component which detects the proper placement of the delivery set on the flow control apparatus and prevents operation of the fluid delivery system unless a set is in proper position.

Claims

1. A disposable medical fluid delivery set designed to be mounted on a separate fluid control apparatus in a predetermined and operation activating alignment, the fluid delivery set comprising a conduit and a magnetic field source mounted on said conduit for the controlled flow of a medical liquid to a patient therethrough;

and

said fluid delivery set further including a fluid reservoir, a flexible tubing section and a further tubing section for the delivery of liquid to a patient therethrough and said magnetic field source forms an abutment on said conduit adjacent said flexible tubing section and said further tubing section.

2. A method of detecting the proper positioning of a medical fluid delivery set having a flexible tubing section and mounting member thereon on a corresponding fluid delivery flow control apparatus having a receiver and a mounting member detection means thereon including the steps of

mounting a fluid delivery set having a tubing section and mounting member thereon on a fluid delivery flow control apparatus,

positioning the fluid delivery set and mounting member on the flow control apparatus such that when the mounting member is operatively inserted into a receiver on the flow control apparatus, the tubing section of the fluid delivery set is operatively mounted about the flow control apparatus and the mounting member is operatively spaced apart from the mounting member detection means, and

detecting the presence of the mounting member in the receiver to enable operation of the flow control apparatus and deliver medical fluid to a patient through the fluid delivery set.

3. The method of claim 2 wherein the detection step is performed by a switch means on the flow control apparatus that detects the presence of the mounting member which is spaced apart from the mounting member detection means in the receiver to switch the switch means between second and first states and wherein the switch means is normally in a second state such that the operation of the flow control apparatus is disabled and wherein the switch means is switched to a first state in response to the detection of the mounting member in the receiver thereby enabling the operation of the flow control apparatus.

4. A medical fluid delivery system comprising:

a peristaltic pump having first and second recessed receivers and a rotatable rotor member thereon for the delivery of a medical fluid to a patient at a controlled rate;

a fluid delivery set including a fluid reservoir section, a fluid delivery section adapted to deliver fluid to a patient and a flexible tube section in fluid communication with said fluid reservoir section and said fluid delivery section, said flexible tube section operatively positioned about at least a portion of said rotor member on said pump and first and second mounting members adapted to be inserted into said first and second recessed receivers;

magnetic sensing means on said peristaltic pump adjacent said second recessed receiver for detecting the placement of a magnetic field source adjacent said second recessed receiver; and

magnetic field source means operatively interposed between said second mounting member and said magnetic sensing means to enable said pump to rotate said rotor to delivery fluid to a patient when said magnetic field source means is detected by said magnetic sensing means.

5. The fluid delivery system of claim 4 wherein said magnetic field source means is adapted to conform to the recessed portion of said second recessed receiver so that at least a portion of said magnetic field source is received in said second recessed receiver between said fluid delivery set and said magnetic sensing means.