Safety interlock system for medical fluid pumps

• US 4,913,703 A
• Filed: 09/30/1987
• Issued: 04/03/1990
• 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): Thaler, Michael H.
• Assistant Examiner(s): LEWIS, WILLIAM W
• Application Number:
  US07/103,432
• Time in Patent Office: 916 Days
• Field of Search: 604/50, 604/67, 604/151-153, 604/254, 417/63, 417/360, 417/474-477, 324/207, 324/208, 324/226, 324/228, 324/234, 324/235, 324/251, 324/252, 324/260, 324/262, 128/DIG. 12, 128/DIG. 13, 73/863.33
• 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 system comprising;

a peristaltic pump and a corresponding fluid delivery set operatively mountable on said peristaltic pump,

a control means on said peristaltic pump for enabling operation of said peristaltic pump,

said control means including a means for detecting a predetermined alignment of at least a portion of said fluid delivery set on said peristaltic pump,

said control means enabling the operation of said peristaltic pump in response to the detection of said at least a portion of said fluid delivery set in the predetermined alignment on said peristaltic pump by said means for detecting,

said fluid delivery set including a magnetic field source mounted in a predetermined position on said fluid delivery set, and said

control means further including a magnetic field sensitive sensor located on said peristaltic pump for detecting said magnetic field source on said fluid delivery set.

2. The medical fluid delivery system of claim 1, wherein said magnetic field source is located on said fluid delivery set in a predetermined position for detection by said magnetic field sensitive sensor on said peristaltic pump when at least a portion of said fluid delivery set is in a predetermined longitudinal alignment on said peristaltic pump to allow fluid delivery by said peristaltic pump and wherein said magnetic field sensitive sensor does not detect said magnetic field source when at least a portion of said fluid delivery set is not in predetermined longitudinal alignment on said peristaltic pump.

3. The medical fluid delivery system of claim 2, wherein an alarm means is located on said peristaltic pump in operative communication with said switching component to activate said alarm means when at least a portion of said fluid delivery is not in predetermined longitudinal alignment on said peristaltic pump.

4. A fluid delivery apparatus for the delivery of a medical fluid to a patient, comprising

a peristaltic pump having first and second receivers and a rotor thereon for controlling the rate of fluid delivery to a patient,

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 adapted to be placed in operative connection with said rotor on said pump and first and second mounting members wherein said second mounting member includes a magnetic field source thereon and said first and second mounting members are arranged in a predetermined configuration on said delivery set such that when said flexible tube section is aligned about said rotor, said first and second mounting members are insertable into said first and second receivers, and

a switch means on said pump for detecting the insertion of said magnetic field source on said second mounting member into said second receiver and wherein said switch means enables said pump to rotate said rotor to deliver fluid to a patient when said second mounting member is detected in said second receiver.

5. A medical fluid delivery system for delivering medical fluid to a patient comprising

a fluid delivery set having a fluid reservoir section, a drip chamber in fluid communication with the fluid reservoir section, a flexible tubing section adapted to be mounted in a predetermined configuration on a fluid delivery apparatus, a mounting member having a magnetic field source thereon and an elongate tubing section adapted to be placed in fluid communication with a patient,

a peristaltic pump having a rotary member and first and second receiving members thereon wherein said drip chamber is mountable on said first receiving member and said mounting member is mountable on said second receiving member,

a switch means on said peristaltic pump for enabling the operation of said rotary member in a first state and disabling operation of said rotary member in a second state,

said drip chamber and mounting member being arranged in a predetermined configuration on said fluid delivery set adjacent to said flexible tubing section such that when said flexible tubing section is aligned about said rotor in a predetermined configuration and said drip chamber is inserted into said first receiving member and said mounting member is inserted into said second receiving member, said flexible tubing section is aligned about said rotary member in an operative contacting relation with said rotary member to allow the peristaltic pump to deliver medical fluid at a controlled rate to a patient, and

wherein an enabling means on said second receiving member switches said switch means from said second state to said first state to enable operation of said rotary member on said peristaltic pump when said magnetic field source is detected by said enabling means.

6. A fluid delivery apparatus for the delivery of a medical fluid to a patient, comprising

a peristaltic pump having a rotary member and first and second receivers thereon,

a switch means on said peristaltic pump for enabling the operation of said rotary member in a first state and disabling operation of said rotary member in a second state and wherein said switch means is normally in the second state,

said second receiver having a magnetic field sensitive sensor adjacent thereto in operative communication with said switch means,

a fluid delivery set including first, second and third tubing sections, a drip chamber and a mounting member having a magnetic field source thereon wherein said first tubing section provides fluid flow communication between a fluid reservoir and said drip chamber and wherein said second tubing section provides fluid flow communication between said drip chamber and said mounting member and wherein said third tubing section provides fluid flow communication between said mounting member and a patient,

said second tubing section being sufficiently flexible so as to be operatively aligned about said rotary member when said fluid delivery set is operatively mounted on said peristaltic pump,

said drip chamber and said mounting member being spaced apart a predetermined distance on said fluid delivery set such that when said second tubing section is operatively aligned about said rotary member, said drip chamber is insertable into said first receiver and said mounting member is insertable into said second receiver, and

wherein said magnetic field sensitive sensor activates said switch means from the second state to the first state in response to the detection of said magnetic field source in said second receiver to enable the operation of the rotary member to deliver fluid to a patient at a controlled rate.

7. A fluid delivery set for the delivery of a medical fluid to a patient at a flow rate controlled by a rotor of a peristaltic pump having a magnetic field sensor and first and second receiving members oriented for receiving portions of and mounting said fluid delivery set in a predetermined and operation activating alignment about the rotor of the peristaltic pump, the fluid delivery set comprising:

a flexible tubing section having the first and second ends and having sufficient flexibility to be adapted to be stretched in the predetermined alignment about the rotor of the peristaltic pump,

a drip chamber in fluid communication with said first end of said tubing section, said drip chamber including a chamber section dimensioned and adapted to be removably mountable in the first receiving member when said tubing section is placed in the predetermined alignment about the rotor of the peristaltic pump, and

a mounting member in fluid communication with said second end of said tubing section, said mounting member including a shoulder section and a magnetic field source dimensioned and adapted to be removably mountable in the second receiving member when said tubing section is placed in the predetermined alignment about the rotor of the peristaltic pump, said magnetic field source being positioned on said mounting member to be mountable in operational proximity to the magnetic field sensor of the peristaltic pump when said tubing section is in the predetermined alignment about the rotor of the peristaltic pump to thereby activate the operation of the peristaltic pump.

8. The fluid delivery set of claim 7 wherein said magnetic field source is toroidally shaped and substantially enclosed in the second receiving member of the peristaltic pump when said tubing section is placed in the predetermined alignment about the rotor of the peristaltic pump.

9. A fluid delivery set for the delivery of a medical fluid to a patient from a source of medical fluid at a flow rate controlled by a rotor of a peristaltic pump having a magnetic field sensor and first and second receiving members oriented for receiving portions of and mounting said fluid delivery set in a predetermined and operation-activating alignment about the rotor of the peristaltic pump, the fluid delivery set comprising:

a flexible first tubing section having first and second ends and having sufficient flexibility to be adapted to be stretched in the predetermined alignment about the rotor of the peristaltic pump,

a second tubing section having first and second ends, said first end adapted to be placed in fluid communication with a source of medical fluid,

a drip chamber having first and second ends, said first end in fluid communication with said second end of said second tubing section and said second end of the drip chamber in fluid communication with said first end of said first tubing section, said drip chamber dimensioned and adapted to be removably mountable in the first receiving members when said first tubing section is placed in the predetermined alignment about the rotor of the peristaltic pump,

a mounting member in fluid communication with said second end of said first tubing section, said mounting member including a magnetic field source dimensioned and adapted to be removably mountable in the second receiving member when said first tubing section is placed in the predetermined alignment about the rotor of the peristaltic pump, said magnetic field source being positioned on said mounting member to be adapted to be in operational proximity to the magnetic field sensor of the peristaltic pump when said first tubing section is in the predetermined alignment about the rotor of the peristaltic pump to thereby activate the operation of the peristaltic pump, and

a third tubing section having a first end in fluid communication with said mounting member and a second end adapted to deliver medical fluid to a patient.