Autoclave tolerant battery powered motorized surgical hand piece tool and motor control method

Abstract

A single cell power unit for a motorized surgical power tool includes a single cell power unit enclosure. A high temperature battery cell is mechanically supported within and disposed at about a center of the single cell power unit enclosure. An electrical connector having a plurality of connector pins is configured to couple to a mating electrical connector of a tool part having a motor. A motorized surgical handpiece tool which prevents the motor from operating when the power unit is removed, a method to start a multi-phase brushless sensorless motor of a surgical hand piece tool in a controlled manner, a power unit for a motorized surgical power tool with a battery insulated by a flexible circuit boards, and a safety switch system for a motorized surgical power tool with a lever magnet motor speed control are also described.

What is claimed is: 
     
         1 . A power unit for a motorized surgical tool, comprising:
 an outer enclosure defining an interior cavity;   a single battery cell fully disposed within said interior cavity; and   a printed circuit board disposed within said interior cavity.   
     
     
         2 . The power unit of  claim 1 , wherein the printed circuit board further comprises a boost converter configured to step up a voltage supplied by the single battery cell. 
     
     
         3 . The power unit of  claim 1 , wherein the single battery cell has a low internal impedance, such that it is capable of producing 22 A at 2.5 V. 
     
     
         4 . The power unit of  claim 1 , wherein the single battery cell is comprised of a Lithium ion ceramic cell. 
     
     
         5 . The power unit of  claim 2 , wherein the voltage is stepped up to 10 V. 
     
     
         6 . The power unit of  claim 2 , wherein the single cell battery supplies  22  A of current. 
     
     
         7 . The power unit of  claim 1 , wherein the battery is directly attached to the printed circuit board, such that ripples in a voltage supplied by the single cell battery are mitigated. 
     
     
         8 . The power unit of  claim 1 , wherein the battery is attached to the printed circuit board by a pair of tabs, wherein the tabs are sized and dimensioned such that ripples in a voltage supplied by the single cell battery are mitigated.