Biopsy device
A biopsy system driver includes a motor having a rotatable output shaft, a support structure, a drive shaft, an elongate lead screw and a biopsy instrument drive member. The drive shaft is rotatably coupled to the support structure and includes or is otherwise operatively connected to the motor output shaft such that activation of the motor rotates the drive shaft. The elongate lead screw is coupled to the drive shaft such that rotation of the drive shaft rotates the lead screw about an axis of the lead screw. The lead screw is axially translatable relative to the drive shaft and to the support structure. The biopsy instrument drive member is threadably coupled to the lead screw such that rotation of the lead screw causes axial translation of one of the lead screw and biopsy instrument drive member relative to the other one and to the support structure.
1. A biopsy system driver, comprising:
a support structure;
a motor secured to the support structure and comprising a rotatable motor output shaft;
a spline rotatably coupled to the support structure and operatively connected to the motor output shaft, wherein activation of the motor rotates the spline;
a drive shaft rotatably coupled to the support structure, wherein the drive shaft is operatively coupled to the spline, wherein rotation of the spline rotates the drive shaft;
an elongate lead screw axially-translatably coupled to the drive shaft, wherein rotation of the drive shaft rotates the lead screw about an axis of the lead screw, wherein the lead screw is axially translatable relative to the drive shaft between a proximal position and a distal position; and
a biopsy instrument drive member comprising a biopsy needle engagement element to operatively couple the biopsy instrument drive member to at least a portion of a biopsy needle, wherein the biopsy instrument drive member is movably coupled to the lead screw between a first position and a second position,
wherein when the lead screw is in the distal position and the biopsy instrument drive member is in the first position, rotation of the lead screw in a first lead screw rotational direction causes axial translation of the biopsy instrument drive member towards the second position, and
wherein when the lead screw is in the distal position and the biopsy instrument drive member is in the second position, rotation of the lead screw in the first lead screw rotational direction causes axial translation of the lead screw towards the proximal position.
2. The biopsy system driver of claim 1 , wherein rotation of the lead screw in the first lead screw rotational direction causes rotation of the spline in a first spline rotational direction.
3. The biopsy system driver of claim 1 , wherein rotation of the lead screw in a second lead screw rotational direction causes rotation of the spline in a second spline rotational direction.
4. The biopsy system driver of claim 1 , wherein the biopsy needle engagement element comprises a fork for receiving at least a portion of the biopsy needle.
5. The biopsy system driver of claim 4 , wherein the spline is operatively engaged with the at least the portion of the biopsy needle received by the fork.
6. The biopsy system driver of claim 4 , wherein the fork comprises a distal lip and a proximal lip for receiving the at least the portion of the biopsy needle.
7. The biopsy system driver of claim 1 , wherein a longitudinal axis of the spline is parallel to the axis of the lead screw.
8. The biopsy system driver of claim 1 , wherein the spline comprises an elongate pinion.
9. The biopsy system driver of claim 1 , further comprising a drive assembly operatively connected to a distal end of the spline, wherein a rotation of the spline causes a rotation of the drive assembly.
10. The biopsy system driver of claim 9 , wherein the drive assembly comprises a belt drive assembly comprising a pully-drive belt.
11. The biopsy system driver of claim 9 , wherein the drive assembly comprises a gear drive assembly comprising at least one gear.
12. The biopsy system driver of claim 1 , wherein the drive shaft and the lead screw are keyed.
13. The biopsy system driver of claim 1 , further comprising a dwell spring assembly coupled to the lead screw, wherein the dwell spring assembly comprises a dwell spring and the lead screw is configured to pass through a lumen of the dwell spring.
14. The biopsy system driver of claim 13 , wherein when the biopsy instrument drive member is in the second position and the lead screw moves towards the proximal position the dwell spring is further compressed relative to an original compressed position of the dwell spring.
15. The biopsy system driver of claim 13 , wherein when the biopsy instrument drive member is in the second position and the lead screw moves towards the distal position the dwell spring is uncompressed relative to an original compressed position of the dwell spring.
16. The biopsy system driver of claim 1 , wherein reversing a rotational direction of the motor rotates the lead screw in a second lead screw rotational direction and causes axial translation of the biopsy instrument drive member from the second position towards the first position.
17. The biopsy system driver of claim 1 , wherein a pitch of the lead screw is consistent over a length of the lead screw.
18. The biopsy system driver of claim 17 , wherein a time of lead screw movement between the distal position and the proximal position is based at least in part on the pitch of the lead screw and a rotational speed of the motor.
19. The biopsy system driver of claim 1 , wherein a distance between the first position and the second position is fixed.
20. The biopsy system driver of claim 1 , wherein the biopsy instrument drive member is threadedly coupled to the lead screw.