Energy saving technique for battery powered inductor

• US 4,890,616 A
• Filed: 10/18/1985
• Issued: 01/02/1990
• Est. Priority Date: 06/27/1984
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Pinckaers, B. Hubert
• Primary Examiner(s): Ramm, William E.
• Application Number:
  US06/788,379
• Time in Patent Office: 1,537 Days
• Field of Search: 128/1.5, 128/82.1, 128/419 F, 128/419 R, 128/421, 128/422, 320/21, 361/143, 361/155-156, 361/159, 328/78, 328/209, 331/86, 331/111-112, 331/112 FE, 318/130, 318/134
• US Class Current: 607/2
• CPC Class Codes: A61N 1/08 Arrangements or circuits for monitoring, protecting, controlling or indicating for external stimulators A61N1/3603; for implantable neurostimulators A61N1/36128; for heart stimulators A61N1/37; for defibrillators A61N1/3925
• CPC Class Codes: A61N 1/326 for promoting growth of cells, e.g. bone cells
• CPC Class Codes: A61N 1/40 Applying electric fields by inductive or capacitive coupling microwave apparatus A61N5/00; Applying radio-frequency signals

Abstract

A battery-powered medical treatment inductor coil generates a pulsed current inducing a magnetic field in the inductor coil for interaction with the patient'"'"'s body. At the end of a pulse, the magnetic field collapses and an energy recovery circuit returns the energy in the collapsing field to the battery to reduce its average drain thus prolonging battery life.

Claims

1. Medical treatment apparatus comprising:

(a) means for applying an electromagnetic field to a treatment site of a patient;

(b) means responsively coupled to said applying means for generating a flow of current and a subsequent flow of current in said applying means;

(c) means responsively coupled to said generation means for interrupting said flow of current in said applying means;

(d) means responsively coupled to said applying means for storing excess energy present in said applying means upon interruption of said flow of current by said interrupting means; and

(e) means responsively coupled to said generating means and said storing means for enabling said generating means to utilize said excess energy for generating said subsequent flow of current.

2. Medical treatment apparatus according to claim 1 wherein said applying means further comprises an output stimulating coil coupled to said generating means.

3. Medical treatment apparatus according to claim 1 wherein said storing means further comprises a capacitor coupled to said generating means.

4. In a medical treatment device having a pulse generator and an output stimulating coil coupled to said pulse generator wherein said pulse generator causes a current to flow through said output stimulating coil in such a manner as to electromagnetically induce current to flow at a treatment site of a patient, the improvement comprising:

means responsively coupled to said pulse generator for interrupting said flow of said current through said output stimulating coil;

means responsively coupled to said output stimulating coil for storing excess energy present in said output stimulating coil upon an interruption of said current by said interrupting means; and

means responsively coupled to said storing means and said pulse generator for directing said excess energy to said pulse generator for generation of a subsequent flow of current.

5. A medical treatment device according to claim 4 wherein said storing means further comprises a capacitor.