Double-transducer system for PEMF Therapy

• US 5,181,902 A
• Filed: 09/21/1990
• Issued: 01/26/1993
• Est. Priority Date: 09/21/1990
• Status: Expired due to Term

• Current Assignee: AMER Technology Limited (AMER International Group Company Limited)
• Original Assignee: American Medical Electronics, Inc. (Orthofix Medical Inc.)
• Inventors: Erickson, John H., Tepper, John C.
• Primary Examiner(s): Cohen, Lee S.
• Assistant Examiner(s): Lacyk, John P.
• Application Number:
  US07/586,505
• Time in Patent Office: 858 Days
• Field of Search: 600/9-15, 128/419 F, 128/802
• US Class Current: 600/13
• CPC Class Codes: A61N 2/02 using magnetic fields produced by coils, including single turn loops or electromagnets A61N2/12 takes precedence

Abstract

A PEMF double-transducer system (FIG. 1) used for PEMF therapy (such as after spinal fusion) uses a two-transducer configuration for generating flux-aided electromagnetic fields. The semi-rigid transducers (12, 14) are comformable, anatomically contoured and flat-wound to enhance patient comfort, and incorporated with an adjustable belt (16) to provide bracing. The belt includes compartments for a drive electronic module (22), and a rechargeable battery pack (24), making the system portable. The drive electronics (FIG. 3) includes a PEMF processor (41) that executes a PEMF program for providing pulsing current to the front and back transducers at predetermined intervals, thereby activating the electromagnetic field according to a prescribed PEMF regimen.

Claims

1. A PEMF double-transducer system for providing PEMF therapeutic stimulation to the spine of a patient'"'"'s body, comprising:

front and back transducers, both including at least a primary winding with a selected number of turns encapsulated in a shell, said shells being at least semi-rigid for providing support to the patient, said shells being anatomically contoured for situating on either side of a target area of the spine for PEMF therapy and physically coupled for releasably securing said transducers in place;

drive electronics coupled to said primary winding of both said front and back transducers for selectively activating an electromagnetic field, thereby implementing a prescribed PEMF therapy;

said drive electronics including a PEMF processor and a PEMF program for controlling said processor to energize and deenergize said transducers to implement a predetermined PEMF therapy program for the patient'"'"'s spine;

said drive electronics also including circuitry for monitoring the patient'"'"'s use of the PEMF system and the course of the PEMF therapy; and

a battery pack electrically connected to said drive electronics

a belt supporting the front and back transducers and having compartments containing the drive electronics, the battery pack, and a buckle for releasably securing the transducers in place such that the PEMF double transducer system is portable.

2. The PEMF double-transducer system of claim 1, wherein:

both front and back transducers further include a secondary winding with a selected number of turns;

said drive electronics including an energy recovery circuit coupled to said secondary winding for recovering energy during each activation of said transducers.

3. The PEMF double-transducer system of claim 2 wherein said energy recovery circuit includes an energy recovery capacitance coupled in parallel with said primary and secondary windings.

4. The PEMF double-transducer system of claim 1, wherein both front and back transducers further include a sense winding with a selected number of sense turns, said sense winding being coupled to said drive electronics for providing a feedback indication of the PEMF output from said transducers.

5. The PEMF double-transducer system of claim 1, wherein the transducers have a substantially flat cross sectional profile.

6. The PEMF double-transducer system of claim 5, wherein, for both the front and back transducers, the primary and secondary windings are flat wound.

7. The PEMF double-transducer system of claim 6, wherein the windings are adhesive coated magnet wire, bonded into a winding bundle prior to encapsulation.

8. The PEMF double-transducer system of claim 1, wherein said encapsulating shell is a polyurethane elastomer.

9. The PEMF double-transducer system of claim 1, wherein said drive electronics generates clock and calendar data, and wherein said PEMF program collects clock and calendar data representative of the patient'"'"'s use of the PEMF system.