초록 ▼

The present surgical tool uses high frequency impulses to replace rotating or oscillating members in cutting through or inserting materials into bone. One embodiment comprises a chisel which uses high frequency impulses to remove bone or other hard material. Because of the high forces developed, a n

The present surgical tool uses high frequency impulses to replace rotating or oscillating members in cutting through or inserting materials into bone. One embodiment comprises a chisel which uses high frequency impulses to remove bone or other hard material. Because of the high forces developed, a novel holder for the chisel to the tool is disclosed. Another embodiment is a wire driver which uses high frequency impulses to drive wire into bone or other tissue. A novel holder for the wire is disclosed which allows wire to be pulled from the tool so that it can be inserted into the bone but prevents wire from slipping back into the tool during the driving operation. The chisel and the wire are driven by a novel pneumatic impulse motor. The motor includes a piston hammer which is mounted in a chamber, and air ports at either end of the chamber alternately direct air to one side of the piston hammer and to the other side of the piston hammer to drive it along the chamber. A novel valve is provided to control the flow of air between air ports.

대표청구항 ▼

In a surgical tool including an impulse motor, an output member for removing or breaking through tissue and impulse transmission means for transmitting impulses from the impulse motor to the output member, a chamber and a piston hammer movable in the chamber from an initial position at the rear end

In a surgical tool including an impulse motor, an output member for removing or breaking through tissue and impulse transmission means for transmitting impulses from the impulse motor to the output member, a chamber and a piston hammer movable in the chamber from an initial position at the rear end of the chamber to an impacting position impacting the impulse transmission means at the forward end of the chamber, air supply means for supplying air to the ends of the chamber, valve means in the chamber for directing air to one or the other end of the chamber, and sensing means on the valve means for sensing the position of the piston hammer to change the valve means from directing air to one end of the chamber to directing air to the other end of the chamber, the improvement comprising: the output means comprises a holding means for holding an impacting member, the impacting member being a wire, the holding means comprising guide means for supporting the impacting member, the impulse transmission means having a central bore aligned with the guide means for receiving a portion of the wire, gripping means extending through the guide means for gripping the impacting member and collet means around the guide means adjacent to the gripping means, the guide means and the collet means being movable relative to each other between a first position wherein the collet means urges the gripping means into the guide means to grip the impacting member and a second position releasing the gripping means to release the impacting member, the guide means is an elongated tube having at least one aperture therethrough, the clamping means comprising a wafer extending through each aperture, the collet means having a tapered end having a larger inside diameter at the end of the tool where the wire is driven tapering to a smaller diameter away from said end of the tool, the aperture being under said tapered portion, the second position of the collet having the greater inside diameter over the aperture to allow the wafers to move radially outward away from the inside of the guide means and out of gripping contact with the wire to permit movement of the wire in the guide means, and the first position of the collet having the smaller inside diameter over the aperture to force the wafers radially inward into the guide means to grip the wire and prevent its movement in the guide means, means connecting the collet means to the impulse transmission means to transmit impulses to the collet means, means interconnecting the collet means to the gripping means and means connecting the gripping means with the wire for transmitting impulses from the collet means through the gripping means to the wire.