Safety interlock system for medical fluid pumps

• US 6,017,326 A
• Filed: 01/19/1993
• Issued: 01/25/2000
• Est. Priority Date: 09/30/1987
• Status: Expired due to Fees

• Current Assignee: Sherwood Services AG
• Original Assignee: Sherwood Services AG
• Inventors: Pasqualucci, Joseph, Schweitzer, Frederick F.
• Primary Examiner(s): Jackson, Gary
• Assistant Examiner(s): Lewis, William W.
• Application Number:
  US08/006,081
• Time in Patent Office: 2,562 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 medical fluid delivery flow control apparatus including a flow control member thereon adapted to be operatively connected to a conduit of a medical fluid delivery set for controlled delivery of the medical fluid therethrough to a patient, the improvement comprising a magnetic sensor on a flow control apparatus responsive to operative connection of a portion of the conduit in predetermined alignment of a portion of said delivery set in relation to said sensor for enabling operation of said flow control member in response to proper operative connection of said conduit on said flow control apparatus, wherein

said predetermined alignment of said portion of said fluid delivery set corresponds to a predetermined alignment of said conduit about said flow control member.

2. A medical fluid delivery system including medical fluid delivery set having flexible tubing adapted to be operatively connected to a medical fluid delivery flow control apparatus for delivery of a medical fluid therethrough, the fluid delivery system comprising a flow control apparatus including a switch for interrupting the operation thereof and a flow control member, a medical fluid delivery set including a switch actuating means thereon for actuating said switch on said flow control apparatus upon proper operative connection of said actuating means in a predetermined and spaced apart relationship with said switch and in response to proper operative connection of a portion of said fluid delivery set in relation to said switch to enable operation of said flow control member, wherein

said predetermined alignment of said portion of said fluid delivery set corresponds to a predetermined alignment of said conduit about said flow control member.

3. A medical fluid delivery system comprising:

a peristaltic pump including a flow control member thereon and a corresponding fluid delivery set operatively mountable on said peristaltic pump,

a controller on said peristaltic pump for enabling operation of said flow control member on said peristaltic pump,

said control means including a sensor for detecting a predetermined and spaced apart alignment of a portion of said fluid delivery set generally adjacent to said sensor on said peristaltic pump, and

said controller enabling the operation of said peristaltic pump in response to the detection of said portion of said fluid delivery set in the predetermined and spaced apart alignment on said peristaltic pump by said sensor and the proper operative mounting of said fluid delivery set about said flow control member.

4. The medical fluid delivery system of claim 3, wherein said fluid delivery set includes an actuation means mounted in a predetermined position on said fluid delivery set for detection by said sensor on said peristaltic pump for enabling operation of a rotor on said peristaltic pump.

5. A medical fluid delivery apparatus comprising a peristaltic pump having a first means thereon for moving fluid through a flexible tube on a fluid delivery set and a second means for preventing improper system operation, said second means including a switching component on said peristaltic pump in operative connection with and downstream of said first means, said switching component being switchable to a first sate in response to the detection of a predetermined alignment where a member on the delivery set which is properly spaced apart form said switching component on said peristaltic pump and said switching component is switchable to a second state when the delivery set is not properly spaced apart from said switching component on said peristaltic pump wherein operation of said first means is enabled in the first state and disabled in the second state of said switching component, wherein

said predetermined alignment corresponds to a predetermined alignment of said conduit about said flow control member.

6. A fluid delivery apparatus comprising:

a motor set forming a housing for a fluid infusion device,

a rotary fluid flow control member on said motor set,

a switch for enabling the rotation of said fluid flow control,

first and second receiving members on said motor set and said second receiving member being downstream of said fluid flow control means,

a sensor adjacent said second receiving member and in communication with said switch for detecting the presence of a portion of a fluid delivery set operatively mounted adjacent said second receiving member, wherein said switch enables the operation of said fluid flow control member in response to the detection of a portion of the fluid delivery set by said sensor when said delivery set is in a predetermined alignment to enable the flow of a liquid through the fluid delivery set, wherein

said predetermined alignment corresponds to a predetermined alignment of said conduit about said fluid flow control member.

7. The apparatus of claim 6, wherein said sensor is a magnetic field sensitive sensor for detecting the presence of a magnetic field source adjacent said second receiving member and spaced apart from said first receiving member on said portion of the fluid delivery set when the fluid delivery set is aligned in said predetermined alignment.

8. The apparatus of claim 6, wherein said fluid flow control member includes a rotationally operating rotor member thereon for the delivery of liquid to a patient at a controlled rate and wherein operation of said rotor member is enabled by said switch.

9. A medical fluid delivery system comprising:

a peristaltic pump having first and second receiving members 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 an upstream portion having a fluid reservoir section and a downstream portion having 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 stretchable about at least a portion of said rotor member on said pump and including first and second mounting members spaced apart form each other and adapted to be inserted into said first and second recessed receivers;

said second mounting member being oriented downstream of said first mounting member;

a sensor on said peristaltic pump adjacent said second receiving member for detecting the placement of an activation means adjacent said second receiving member; and

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

10. A disposable medical fluid delivery set adapted to be mounted on a separate fluid control apparatus in a predetermined and operation-activating alignment, the fluid delivery set comprising a conduit having aportion thereof which is stretchable for mounting about a portion of the fluid flow control apparatus and a sensed member operatively mounted downstream of said stretchable portion of said conduit wherein said sensed member is a magnetic field source and said sensed member is sensed by the flow control apparatus to enable the flow of a medical fluid to a patient through said conduit.

11. The fluid delivery set of claim 10 wherein said sensed member is sensed by a sensor on the fluid flow control apparatus when said stretchable portion of said conduit is properly stretched about a rotor on the fluid flow control apparatus thereby enabling the controlled flow of a medical fluid through said conduit.

12. The fluid delivery set of claim 10 wherein said sensed member is a magnetic field source.

13. The fluid delivery set of claim 10 wherein said sensed member forms part of a mounting member on said conduit and is positioned generally adjacent said stretchable portion of said conduit.

14. A disposable medical fluid delivery set dimensioned to be mounted on a separate fluid control apparatus in a predetermined and operation activating alignment, the fluid delivery set comprising a conduit having a compressible portion thereon and a magnetic field source mounted on said conduit and a drip chamber therein spaced apart form said magnetic field source to enable the controlled flow of a medical liquid to a patient therethrough.

15. The fluid delivery set of claim 14 wherein said compressible portion of said conduit is stretchable about a portion of the fluid control apparatus.

16. The fluid delivery set of claim 14 wherein said magnetic field source forms an abutment on said conduit which is sized to be received on the fluid control apparatus.

17. The fluid delivery set of claim 16 wherein a further abutment is formed on said conduit and said further abutment is sized to be received in a recess on the fluid control apparatus.