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The present invention is directed to an improved cable driven surgical biopsy device wherein a transmission assembly is disposed at a proximal end of the biopsy device. The transmission assembly being adapted to convert rotational motion of a cable entering the biopsy device of a substantially right

The present invention is directed to an improved cable driven surgical biopsy device wherein a transmission assembly is disposed at a proximal end of the biopsy device. The transmission assembly being adapted to convert rotational motion of a cable entering the biopsy device of a substantially right angle into rotational energy to drive the axial cutter in the biopsy device.

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1. A biopsy instrument comprising: a base assembly including a firing mechanism; a probe assembly detachably mounted to said base assembly, said probe assembly comprising: a cutter assembly comprising: a cutter; a gear mechanism adapted to move said cutter; a piercer assembly comprising:

1. A biopsy instrument comprising: a base assembly including a firing mechanism; a probe assembly detachably mounted to said base assembly, said probe assembly comprising: a cutter assembly comprising: a cutter; a gear mechanism adapted to move said cutter; a piercer assembly comprising: a piercer; a probe mount; a drive assembly detachably mounted to said cutter assembly, said drive assembly comprising: a flexible drive shaft; a transmission comprising: a first bevel gear operatively connected to a distal end of said flexible drive shaft; a second bevel gear intermeshed with said first bevel gear and operatively connected to said gear mechanism. 2. A biopsy instrument comprising: a base assembly including a firing mechanism; a probe assembly detachably mounted to said base assembly, said probe assembly comprising: a cutter assembly comprising: a cutter; a first drive gear; a gear mechanism adapted to move said cutter wherein said gear mechanism includes a second drive gear adapted to mesh with said first drive gear; a piercer assembly comprising: a piercer including a cutter lumen adapted to receive said cutter; a probe mount adapted to slideably connect said piercer to said cutter assembly; a drive assembly detachable mounted to said cutter assembly, said drive assembly comprising: a flexible drive shaft adapted to be connected at its proximal end to a control unit including a motor; a transmission adapted to transmit motion from a distal end of said flexible drive shaft to said gear mechanism, said transmission comprising: a first bevel gear operatively connected to a distal end of said flexible drive shaft; a second bevel gear intermeshed with said first bevel gear at a first angle with respect to said first bevel gear and operatively connected to a releasable drive mechanism adapted to slideably connect with a proximal end of said gear mechanism. 3. A medical instrument according to claim 2, said medical instrument further comprising a coupling alignment sleeve operatively connected to said releasable drive mechanism. 4. A transmission assembly for a medical instrument said transmission assembly comprising: a mounting bracket; a transmission plate; a rotation coupling assembly comprising: a rotation gear; a rotation drive coupling; a translation coupling assembly comprising: a translation gear; a translation drive coupling; a thumbwheel rotation assembly comprising: a port drive coupling; a first port gear; a second port gear; a knob post; an electrical cable strain relief; a clamping plate assembly comprising: a rotational bevel gear; a translational bevel gear; a rotation shaft; a translation shaft; an encoder assembly comprising: a first bearing assembly comprising: a bearing; an encoder; a flex relief. 5. The transmission assembly of claim 4 further comprising a gear adapter with and elongated adapter slot operatively connected to said rotation bevel gear.