Transperineal biopsy guide with mount, guide member, and displacement member displaceable within a gap of the guide member
A transperineal biopsy including a mount, a guide member, and a displacement member. The mount is attachable to the transrectal imaging probe. The guide member extends from the mount and includes a first side including a first distal member, a first vertical member spaced proximally from the first distal member, and a first inward facing surface. The guide member also includes a second side opposing the first side and includes a second distal member, a second vertical member spaced proximally from the second distal member, and a second inward facing surface. The displacement member is supported by the guide member in the gap between the first side and the second side. The displacement member is displaceable within the gap. At least one of the first distal member or the second distal member limits distal displacement of the displacement member within the gap.
1. A transperineal biopsy guide configured for use with an access needle and a transrectal imaging probe adjacent a patient's perineum, the access needle including a proximal end hub, a distal sharp end opposite the proximal end hub and a longitudinal axis extending between the proximal end hub and the distal sharp end, the access needle sized to receive a biopsy instrument therethrough, the transrectal imaging probe including a proximal end, a distal end and a longitudinal axis extending between the proximal end and the distal end, the transrectal imaging probe configured to provide imaging in an imaging plane of the transrectal imaging probe, the transperineal biopsy guide comprising:
a mount attachable to the transrectal imaging probe between the proximal and distal ends of the transrectal imaging probe;
a guide member extending from the mount and including:
a first side comprising a first distal member, a first vertical member spaced proximally from the first distal member, and a first inward facing surface; and
a second side opposing the first side and comprising a second distal member, a second vertical member spaced proximally from the second distal member, and a second inward facing surface,
a gap between the first side and the second side; and
a displacement member supported by the guide member in the gap and displaceable within the gap, wherein at least one of the first distal member or the second distal member limits distal displacement of the displacement member within the gap, the displacement member including an opening configured to receive the access needle, the access needle being at least partially located in the gap when the access needle is received in the opening.
2. The transperineal biopsy guide of claim 1 , wherein displacement of the displacement member relative to the first and second distal members causes at least a portion of the access needle to be at least one of positioned, or increasingly positioned, within the imaging plane when the access needle is received in the opening.
3. The transperineal biopsy guide of claim 1 , wherein distal displacement of the displacement member within the gap causes a portion of the displacement member to be engaged by a stop feature of the guide member, thereby holding the displacement member in a distal position relative to the first and second distal members.
4. The transperineal biopsy guide of claim 3 , wherein, in the distal position, additional distal displacement is prevented.
5. The transperineal biopsy guide of claim 4 , wherein the first distal member comprises a first proximal surface, and the second distal member comprises a second proximal surface, and wherein additional distal displacement is prevented via interaction of the displacement member with the first and second proximal surfaces.
6. The transperineal biopsy guide of claim 5 , wherein the displacement member further comprises first and second lateral extension members, the first and second lateral extension members being on opposite sides of the opening from each other, wherein, in the distal position, the first lateral extension member of the displacement member abuts the first proximal surface of the first distal member and the second lateral extension member of the displacement member abuts the second proximal surface of the second distal member.
7. The transperineal biopsy guide of claim 1 , wherein the displacement member further comprises first and second lateral extension members, the first and second lateral extension members being on opposite sides of the opening from each other, wherein distal displacement of the displacement member within the gap is limited by contact between the first lateral extension member and the first distal member and by contact between the second lateral extension member and the second distal member.
8. The transperineal biopsy guide of claim 1 , wherein the displacement member is displaceable within the gap along an axis via guidance by at least one of the first inward facing surface or the second inward facing surface.
9. The transperineal biopsy guide of claim 8 , wherein the axis is parallel with the longitudinal axis of the transrectal imaging probe when the mount of the transperineal biopsy guide is attached to the transrectal imaging probe.
10. The transperineal biopsy guide of claim 8 , wherein a first lateral side of the displacement member and the first inward facing surface have a complementary mechanically meshed interface.
11. The transperineal biopsy guide of claim 10 , wherein a second lateral side of the displacement member and the second inward facing surface have the complementary mechanically meshed interface.
12. The transperineal biopsy guide of claim 11 , wherein the complementary mechanically meshed interface includes a male linearly extending member slidably received within a female linearly extending recess.
13. The transperineal biopsy guide of claim 12 , wherein the male linearly extending member is part of the first inward facing surface, and the female linearly extending recess is defined on the first lateral side of the displacement member.
14. The transperineal biopsy guide of claim 1 , wherein the first side further comprises a first side member extending proximally from the first distal member to the first vertical member, and the second side further comprises a second side member extending proximally from the second distal member to the second vertical member.
15. The transperineal biopsy guide of claim 1 , wherein distal displacement of the displacement member relative to the first and second distal members causes a portion of the displacement member to ride up and over a ramp feature of the guide member, wherein, when the portion of the displacement member has distally passed an apex of the ramp feature, the displacement member is held by the ramp feature in a distal position of the displacement member relative to the first and second distal members.
16. The transperineal biopsy guide of claim 1 , wherein the displacement member is pivotally supported by the guide member in the gap.
17. The transperineal biopsy guide of claim 1 , wherein, when the access needle is received in the opening, the access needle is pivotal relative to the mount about a pivot axis perpendicular to the longitudinal axis of the transrectal imaging probe while ensuring that the longitudinal axis of the access needle remains in the imaging plane of the transrectal imaging probe.
18. The transperineal biopsy guide of claim 17 , wherein the mount includes a fastener that at least assists in attaching the mount to the transrectal imaging probe, and the pivot axis is distal the fastener.
19. The transperineal biopsy guide of claim 1 , wherein the first and second distal members are a distal-most portion of the guide member.
20. The transperineal biopsy guide of claim 1 , further comprising a mechanical interface between the proximal end hub of the access needle and a proximal end of the displacement member when the access needle has been received by the opening, the mechanical interface inhibiting rotation of the access needle relative to the displacement member.
21. The transperineal biopsy guide of claim 1 , wherein the opening includes a port through which the access needle extends in being received by the port, wherein at least a portion of the port includes a cross-section with a circumferential boundary that is cylindrical with radially outward projections at twelve o'clock, three o'clock, six o'clock and nine o'clock.
22. The transperineal biopsy guide of claim 1 , wherein, when the mount is attached to the transrectal imaging probe, movement of the transrectal imaging probe causes corresponding movement to the guide member.
23. The transperineal biopsy guide of claim 1 , further comprising the access needle.
24. The transperineal biopsy guide of claim 1 , wherein the first and second inward facing surfaces are a fixed distance apart from each other.
25. The transperineal biopsy guide of claim 1 , wherein the first inward facing surface is part of a first guide rail extending from the first vertical member to the first distal member, and the second inward facing surface is part of a second guide rail extending from the second vertical member to the second distal member.