Semi-automatic biopsy needle device and methods of use
A biopsy needle device is disclosed. The biopsy needle device may be configured to be advanced to a predetermined tissue sample, collect and sever the tissue sample utilizing an actuator comprising a linear displacement mechanism, and extract the tissue sample from a body tissue of a patient.
1. A biopsy needle device, comprising:
an elongate outer member comprising a distal end configured to sever a tissue sample;
an elongate inner member disposed within the elongate outer member wherein the elongate inner member comprises a distal end configured to penetrate tissue and a notch configured to retain a tissue sample; and
an actuator comprising:
a torque converter configured such that a continuous motion of the torque converter 360 degrees in a first rotational direction displaces the outer member over the inner member from a distal position to a proximal position to the distal position as the actuator is cocked and a continuous motion of the torque converter 360 degrees in a second rotational direction displaces the outer member over the inner member from the distal position to the proximal position to the distal position as the actuator is activated;
a linkage member that couples the torque converter to the outer member;
a linear gear configured such that linear displacement of the linear gear is translated into rotational motion of the torque converter; and
a trigger partially disposed within a housing of the biopsy needle device and engaged with the linear gear, the trigger is configured to cock the actuator and activate the actuator,
wherein proximal linear movement of the trigger extends the trigger partially out of the housing which simultaneously moves the linear gear from a distal location to a proximal location within the housing which rotates the torque converter which causes linear movement of the elongate outer member relative to the elongate inner member via the linkage member, and
wherein activation of the trigger causes distal linear movement of the trigger partially into the housing which simultaneously moves the linear gear from the proximal location to the distal location within the housing which causes linear movement of the elongate outer member relative to the elongate inner member via the linkage member.
2. The biopsy needle device of claim 1 , wherein the actuator further comprises a circular gear configured to mesh with the linear gear and coupled to the torque converter;
wherein the torque converter is coupled to the elongate outer member.
3. The biopsy needle device of claim 1 , wherein the elongate inner member comprises a tube.
4. The biopsy needle device of claim 1 , wherein the trigger further comprises a first hook configured to lock the linear gear in a cocked position.
5. The biopsy needle device of claim 4 , wherein the trigger further comprises a second hook configured to displace the first hook away from the linear gear.