Biopsy forceps assemblies
Embodiments of the invention include devices for obtaining tissue including a proximal actuator and a distal assembly having first and second end effectors. The first and second end effectors include the features of at least one element within the inner surface either of the first and second end effectors for aiding in the capture and retention of a targeted tissue sample.
1. A device for obtaining a tissue sample, comprising:
a proximal actuator;
a distal assembly having first and second jaws, wherein the first jaw includes an inner surface including a plurality of curved surfaces each extending from an edge of the first jaw to a tip of a pyramid-shaped spike, each curved surface defining a distinct cavity recessed below a base of the pyramid-shaped spike, each distinct cavity curving down below the base of the pyramid-shaped spike and curving back up to the edge of the first jaw for providing increased retention of the tissue sample, wherein the second jaw defines a hole, the tip of the pyramid-shaped spike pointing towards the hole when the first jaw and the second jaw are in a closed position, and wherein, in the closed position, the edge of the first jaw mates with an edge of the second jaw, and the tip is aligned directly opposite the hole and does not enter the hole; and
an elongate member connecting the proximal actuator to the distal assembly, wherein actuation of the proximal actuator causes the first and second jaws to pivot relative to one another.
2. The device for obtaining a tissue sample of claim 1 , wherein the second jaw includes a concave inner surface defining a substantially hemispherical cup.
3. The device for obtaining a tissue sample of claim 2 , wherein the concave inner surface of the second jaw defines the hole.
4. The device for obtaining a tissue sample of claim 1 , wherein the pyramid-shaped spike includes triangular-shaped surfaces that meet at the tip.
5. The device for obtaining a tissue sample of claim 1 , wherein the curved surfaces are distinct concave surfaces on distal, proximal, and lateral sides of the pyramid-shaped spike.
6. The device for obtaining a tissue sample of claim 1 , wherein the pyramid-shaped spike is integrally formed with the first jaw.
7. The device for obtaining a tissue sample of claim 1 , wherein the first jaw includes lateral, straight edges having teeth, the lateral edges connected by a curved distal edge not including teeth.
8. The device for obtaining a tissue sample of claim 7 , wherein the second jaw includes lateral, straight edges having teeth, the lateral edges of the second jaw connected by a curved distal edge not including teeth.
9. The device for obtaining a tissue sample of claim 7 , wherein a pattern of teeth arranged on the first jaw complements a pattern of teeth arranged on the second jaw such that, when the jaws are closed, the edges of the first and second jaws align substantially without space between the edges.
10. The device for obtaining a tissue sample of claim 8 , wherein each tooth projecting from the lateral, straight edges of the first and second jaws includes a substantially flat top surface and angled sides.
11. The device for obtaining a tissue sample of claim 8 , wherein each jaw includes two teeth on one lateral, straight edge and only one tooth on an opposite, lateral, straight edge.
12. The device for obtaining a tissue sample of claim 8 , wherein a proximal portion of each jaw includes a stepped-down heel portion to permit substantially complete jaw closure.
13. The device for obtaining a tissue sample of claim 1 , wherein adjoining curved surfaces of the pyramid-shaped spike meet with each other to form a distinct edge.
14. The device for obtaining a tissue sample of claim 1 , wherein the pyramid-shaped spike includes concave faces.
15. The device for obtaining a tissue sample of claim 1 , wherein the tip terminates at or below a base of the hole when the first and second jaws are in the closed position.