| US 7,468,046 B2 | ||
| Impedance-matched vibration massager | ||
| Mitsuru Takashima, Tokyo (Japan) | ||
| Assigned to M.I. Laboratories Corporation, Tokyo (Japan) | ||
| Filed on Feb. 01, 2005, as Appl. No. 11/47,908. | ||
| Prior Publication US 2005/0203446 A1, Sep. 15, 2005 | ||
| Int. Cl. A61H 1/00 (2006.01) | ||
| U.S. Cl. 601—46 | 6 Claims |
| 1. A self-excited, impedance-matched vibration massager comprising:
(a) a contact piece to be held against an object to be massaged, the contact piece having a cavity formed therein with an
open end for allowing entry of a portion of an object;
(b) a pressure sensor at or adjacent to the contact piece for sensing pressure variations in the cavity in the contact piece
when the contact piece is held against the object, in order to ascertain the mechanical impedance of the object;
(c) a vibrator drivingly coupled to the contact piece to transmit vibrations to massage the object; and
(d) a self excited feedback vibration control electric circuit connected between the pressure sensor and the vibrator for
positively feeding back the mechanical impedance of the object to the vibrator;
(e) whereby the vibrator vibrates at a resonance frequency ranging from several hertz to several tens of hertz, the contact
piece to massage the object at a desired resonance frequency.
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