Patent ID: 6277135
Filing Date: 2001-08-21
Classification: A61B

Abstract:
A driven rotary incision scalpel comprising: a pistol handle-shaped housing having a sleeved hole horizontally formed at a front of the housing; a hollow rotary scalpel assembly mounted in the sleeved hole and including a blade disposed slightly inwardly within a front end of an inner barrel capable of retraction and extension from an exterior section, the blade capable of extending outwardly from a front end of an outer barrel, constituting a three-layer cylindrical scalpel body, wherein the outer barrel extends into the sleeved hole; an annular compression spring positioned around an outer circumference of the hollow rotary scalpel assembly holding the rear of the outer barrel inside a chuck band at a center section of the housing, the spring normally pushing the outer barrel outward beyond the blade at the front end of the said hollow rotary scalpel assembly to thereby serve as a protective covering; a first bearing sleeved around the outer circumference at an interior section of the hollow rotary scalpel assembly positioning a rotatable first bevel gear;a small form factor motor internally mounted at a bottom section of the housing; a gear mounted on a shaft of the motor meshing with inner teeth of a ring gear of a two-stage reduction mount situated on a second bearing; a second bevel gear on the two-stage reduction mount meshing with the first bevel gear to rotate the hollow rotary scalpel assembly and thereby synchronously impelling rotary incision action;a trigger assembly projecting from outer sides of a lower center section of the housing the trigger assembly having a top section and rear extent, such that when pulled and thereby moved towards a rear, the trigger assembly moves a front end of a contact point of a contact switch which places a power supply in continuity with the motor to enable operation of the motor, whereby at the same time the trigger assembly is pulled towards the rear and locked back, said outer barrel moves backward, causing the blade at the front end of the said hollow rotary scalpel assembly to extend outward and initiates the operation of the motor to rotate the hollow rotary scalpel assembly.