Contoured triangular transducer system for PEMF therapy

• US 5,195,941 A
• Filed: 01/07/1991
• Issued: 03/23/1993
• Est. Priority Date: 01/07/1991
• 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:
  US07/638,219
• Time in Patent Office: 806 Days
• Field of Search: 600/9-10, 600/13-15, 128/804, 128/798
• US Class Current: 600/14
• CPC Class Codes: A61N 2/02 using magnetic fields produced by coils, including single turn loops or electromagnets A61N2/12 takes precedence
• CPC Class Codes: Y10T 29/49071 by winding or coiling

Abstract

A PEMF contoured triangular transducer system (FIGS. 1a-1b) used for PEMF therapy (such as after spinal fusion) uses a two-transducer configuration for generating fluxaided electromagnetic fields. The semi-rigid transducers (12, 14) are conformable to a selected anatomical contour, and incorporated with an adjustable belt (16) to provide bracing. The belt includes compartments for a drive electronics 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 contoured triangular transducer system for providing PEMF therapeutic stimulation to a selected target area of a patient'"'"'s body, comprising:

a transducer including at least a primary winding with a selected number of turns encased in a shell, said shell being at least semi-rigid;

when flat, said transducer is substantially triangular to define three sides and three respective angular areas;

said transducer being anatomically contoured to fit snugly adjacent the back of the neck or the shoulder of a patient, with at least one of said sides being conformably curved such that corresponding angular areas are positioned on either side of the target area for PEMF therapy; and

activation electronics coupled to said primary winding for selectively activating electromagnetic fields, thereby implementing a prescribed PEMF therapy.

2. The PEMF contoured triangular transducer system of claim 1, wherein:

said transducer further includes a secondary winding with a selected number of turns;

said activation electronics further includes drive electronics; and

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

3. The PEMF contoured triangular 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 contoured triangular transducer system of claim 1, wherein said transducer further includes a sense winding with a selected number of sense turns and said activation electronics further includes drive electronics, said sense winding being coupled to said drive electronics for providing a feedback indication of the PEMF output from said transducer.

6. The PEMF contoured triangular transducer system of claim 2, wherein said primary and secondary windings are flat wound.

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

8. The PEMF contoured triangular transducer system of claim 1, wherein said shell is a polyurethane elastomer.

9. The PEMF contoured triangular transducer system of claim 1, wherein said activation electronics comprises:

control electronics for providing control signals that control the PEMF activation of said transducer windings; and

drive electronics responsive to said control signals for providing a selected activation current through said transducer windings.

10. The PEMF contoured triangular transducer system of claim 9, wherein

said drive electronics is encapsulated with said transducer shell;

and

said control electronics is included in a separate control electronics module and coupled to said encapsulated drive electronics by a cable.

11. The PEMF contoured triangular transducer system of claim 1, wherein said activation electronics includes:

a PEMF processor;

a PEMF program for controlling the activation of the electromagnetic fields, thereby implementing a PEMF therapy program.

12. The PEMF contoured triangular transducer system of claim 11, wherein said activation electronics includes a pulse circuit for providing, under control of the PEMF program, pulses that cause the energization and deenergization of the transducer, thereby activating the electromagnetic field.

13. The PEMF contoured triangular transducer system of claim 12, wherein said activation electronics collects appropriate data for monitoring the patient'"'"'s use of the PEMF system and the course of the PEMF therapy.

14. The PEMF contoured triangular transducer system of claim 13, wherein said activation 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.

15. The PEMF contoured triangular transducer system of claim 1, wherein the selected target area for PEMF therapy is the neck, and said transducer is configured with a corresponding anatomical contour for positioning around the back of the patient'"'"'s neck with two corresponding angular areas on either side of the neck.

16. The PEMF contoured triangular transducer system of claim 15, wherein said transducer is attached to a cervical collar.

17. The PEMF contoured triangular transducer system of claim 1, wherein the selected target area for PEMF therapy in the shoulder, and said transducer is configured with a corresponding anatomical contour for positioning over the patient'"'"'s shoulder with two corresponding angular areas in front and back of the shoulder.

5. The PEMF contoured triangular transducer system of claim wherein said transducer has a substantially flat cross sectional profile.

18. A PEMF contoured triangular transducer system for providing PEMF therapeutic stimulation to the cervical area of a patient'"'"'s body, comprising:

a transducer including at least a primary winding with a selected number of turns encased in a shell, said shell being at least semi-rigid, which when flat, is substantially triangular in shape;

said transducer being anatomically contoured to fit snugly on either side of the neck, with one side of said transducer being conformably curved for positioning on the back of the patient'"'"'s neck such that corresponding angular areas of said transducer are positioned on either side of the neck;

drive electronics encased in said shell;

a control electronics module including control electronics coupled to said drive electronics for providing control signals;

said drive electronics coupled to said primary winding for selectively activating electromagnetic fields in response to said control signals, thereby implementing a prescribed PEMF therapy; and

attachment means for attaching said transducer to a cervical collar that is worn around the neck.

19. The PEMF contoured triangular transducer system of claim 18, further including a battery pack for said control electronics such that said control electronics module, and therefore, the transducer system, is portable.

20. A PEMF contoured triangular transducer system for providing PEMF therapeutic stimulation to the shoulder area of a patient'"'"'s body, comprising:

a transducer including at least a primary winding with a selected number of turns encased in a shell, said shell being at least semi-rigid, which when flat, is substantially triangular in shape;

said transducer being anatomically contoured to fit snugly in front and back of the shoulder, with one side of said transducer being conformably curved for positioning over the top of the patient'"'"'s shoulder such that corresponding angular areas of said transducer are positioned in front and in back of the shoulder;

drive electronics encased in said shell;

a control electronics module including control electronics coupled to said drive electronics for providing control signals;

said drive electronics coupled to said primary winding for selectively activating electromagnetic fields in response to said control signals, thereby implementing a prescribed PEMF therapy; and

attachment means for attaching said transducer to a cervical collar that is worn around the neck.

21. The PEMF contoured triangular transducer system of claim 20, further including a battery pack for said control electronics such that said control electronics module, and therefore, the transducer system, is portable.