Peeling apparatus for removing surface portions of human tissue with purging arrangement

A peeling apparatus for removing a surface portion of a human tissue by abrasion caused by a stream of a mixture of air with at least one granular abrasive substance striking on said surface portion of said human tissue to be removed, wherein said peeling apparatus comprises:

• an abrasive substance supply means supplying granular abrasive substances, which comprises a supply reservoir storing a predetermined amount of fresh abrasive substance therein, and a fresh substance outlet member extended into said supply reservoir;
• a peeling tool, which is an instrument adapted to be manipulated to remove said surface portion of said human tissue, having an input opening, a delivery hole and an output opening, wherein said input opening is connected to said fresh substance outlet member of said supply reservoir;
• a suction means for providing a negative air pressure environment within said supply reservoir so as to cause a stream of a mixture of air and said granular abrasive substance traveling from said fresh substance outlet member to said peeling tool through said input opening thereof, said suction means comprising
• a collection reservoir having a used substance inlet member connected to said output opening of said peeling tool and an air filtering outlet member, and
• a suction pump having an air outlet and an air inlet connecting with said air filtering outlet member of said collection reservoir through a first air duct,
• wherein by keeping in contact said delivery hole with said surface portion of said human tissue to be subjected to treatment, said steam of said mixture of said air and said abrasive substances traveling through said delivery hole is caused to strike said surface portion of said human tissue facing said delivery hole, wherein after striking said surface portion of said human tissue, a mixture of said air and used abrasive substances containing said abrasive substances and tissues removed from said surface portion is collected in said collection reservoir via said output opening of said peeling tool and said used abrasive substance inlet member of said collection reservoir, wherein said air filtering outlet member of said collection reservoir filters said used substances and stores in said collection reservoir while sucking said air by said suction pump via said first air duct;
• and
• a purging arrangement, comprising
• a first switch means, which comprises a control switch valve connected at said first air dust, for regulating said compressed air flowing from said air filtering outlet member of said collection reservoir to said suction pump normally, and being selectively switched to cut off said connection between collection reservoir and said air inlet of said suction pump while instantaneously connecting said air outlet of said suction pump to said air filtering outlet member instead, so as to deliver said air output from said air outlet of said suction pump reversely to said air filtering outlet member for purging a clogged condition thereof;
• and
• a second switch means for normally ensuring said air outlet of said suction pump connected to outside and selectively switching to instantaneously connect said air outlet of said suction pump to said fresh substance outlet member of said abrasive substance supply means so as to deliver said air output from said air outlet of said suction pump reversely to said fresh substance outlet member for purging a clogged condition thereof.