Surgical Instrument
A surgical instrument is described that is configured to apply a force to first and second surfaces to secure the first surface relative to the second surface during fixation of the first and second surfaces.
1 . A surgical instrument configured to retain an implant against a mandible, the surgical instrument comprising:
a first arm including a first proximal portion, a first distal portion, and a first body portion that extends distally from the first proximal portion to the first distal portion, the first distal portion including at least one grip member configured to grip the mandible; and
a second arm that is pivotally coupled to the first arm about a pivot axis, the second arm including a second proximal portion, a second distal portion, and a second body portion that extends distally from the second proximal portion to the second distal portion, the second distal portion carrying an implant retention member that is configured to abut the implant at a first location of the second arm, and further carrying a piercing portion that is configured to pierce the implant, the piercing portion disposed at a second location of the second arm that is spaced from the first location of the second arm.
2 . The instrument of claim 1 , wherein the first distal portion includes a first inner surface that faces the second arm, and the grip member includes at least one first protrusion that extends out from the first inner surface.
3 . The instrument of claim 2 , wherein the one or more first protrusions include two conical spikes.
4 . The instrument of claim 2 , wherein the at least one first protrusion tapers along a direction that extends substantially perpendicularly out from the first inner surface.
5 . The instrument of claim 2 , wherein the one or more first protrusions include at least one of a spike with a flattened top, a blade, and a textured surface.
6 . The instrument of claim 2 , wherein the grip member is configured to frictionally grip but not pierce the first surface.
7 . The instrument of claim 1 , wherein the implant retention member includes at least one cradle that is configured to abut the implant, and at least one piercing portion that is configured to pierce the implant.
8 . The instrument of claim 7 , wherein the second distal portion includes at least one spike and at least one tooth having a tooth apex, the cradle extends from the spike to the apex, and the apex that at least partially defines the piercing portion.
9 . The instrument of claim 8 , wherein the spike is substantially conical.
10 . The instrument of claim 8 , wherein the at least one tooth includes a pair of teeth that are spaced apart from each other.
11 . The instrument of claim 8 , wherein the tooth apex is tapered so as to define a leading edge configured to pierce the second surface.
12 . The instrument of claim 11 , wherein the tooth apex is tapered with respect to two directions such that the leading edge is in the form of a point.
13 . The instrument of claim 11 , wherein the tooth apex is tapered with respect to one direction such that the leading edge is in the form of a line.
14 . The instrument of claim 1 , wherein rotation of the first arm relative to the second arm about the pivot axis in a first direction causes the first distal portion to move toward the second distal portion.
15 . The instrument of claim 14 , wherein rotation of the first arm relative to the second arm about the pivot axis in a second direction causes the first distal portion to move away from the second distal portion.
16 . The instrument of claim 15 , further comprising a locking mechanism that is configured to prevent rotation of the first arm relative to the second arm about the pivot axis in the second direction.
17 . The instrument of claim 16 , wherein the locking mechanism includes first and second ratchet arms attached to the first and second arms, respectively, the first and second ratchet arms each including corresponding teeth that cam over each other when the first arm is rotated with respect to the second arm in the first direction, and the corresponding teeth interfere with each other when the first arm is rotated with respect to the second arm in the second direction.
18 . The instrument of claim 1 , wherein the first body portion is elongate along a first central axis, and the first tip portion is elongate along a second central axis, the first central axis and the second central axis intersect to define an angle.
19 . The instrument of claim 18 , wherein the first central axis and the second central axis are angularly offset such that the angle is between about 90 degrees and about 145 degrees.