Surgical retractor system and snap joint clamp
A joint clamp for a surgical retractor system includes a knob, a lower clamp, one or more upper clamps between the lower clamp and the knob, and a bolt that passes through the one or more upper clamps. The lower clamp includes a spring, an upper portion, a lower portion pivotally coupled to the upper portion, and a clamping passage that passes laterally through the upper and lower portions of the lower clamp. The bolt includes a bolt upper portion coupled to the knob and a lower portion secured to the upper portion of the lower clamp. The spring exerts a biasing force on the lower portion of the lower clamp that pivots threads of the lower clamp toward the upper portion of the lower clamp.
1 . A joint clamp for a surgical retractor system, the joint clamp comprising:
a clamp upper portion;
a clamp lower portion pivotally coupled to the clamp upper portion, wherein the clamp lower portion comprises a threaded bore into an upper surface of the clamp lower portion;
a clamping passage that passes laterally between the clamp upper portion and the clamp lower portion;
a bolt that pass vertically through the clamp upper portion, wherein the bolt comprises a bolt upper portion and a bolt lower portion, and wherein the bolt lower portion comprises threads;
a knob coupled to the bolt upper portion; and
a spring that exerts a biasing force on the clamp lower portion;
wherein the biasing force urges the clamp lower portion to pivot toward the clamp upper portion and abut the threaded bore of the clamp lower portion against the threads of the bolt lower portion; and
wherein rotation of the knob in a first direction rotates the bolt such that the threads of the bolt lower portion engage the threaded bore of the clamp lower portion and draw the clamp lower portion toward the knob.
2 . The joint clamp of claim 1 , wherein rotation of the knob in the first direction increases a clamping force exerted by the clamp upper portion and the clamp lower portion upon an object in the clamping passage.
3 . The joint clamp of claim 1 , wherein the spring comprises one or more torsion springs that engage the clamp upper portion and the clamp lower portion and collectively exert the biasing force upon the clamp lower portion.
4 . The joint clamp of claim 3 , comprising a pivot pin that laterally passes through the clamp upper portion and the clamp lower portion and through the one or more torsion springs.
5 . The joint clamp of claim 4 , wherein the clamping passage is positioned between the pivot pin and the bolt lower portion.
6 . The joint clamp of claim 4 , wherein ends of the clamp upper portion and the clamp lower portion that are distal from the pivot pin are tapered to laterally guide an object into the clamping passage.
7 . The joint clamp of claim 1 , wherein the biasing force exerted by the spring is sufficient to overcome a gravitational force exerted on the clamp lower portion and abut the threaded bore of the clamp lower portion against the threads of the bolt lower portion.
8 . The joint clamp of claim 1 , comprising:
an upper spring between the knob and the clamp upper portion; and
wherein the upper spring biases the knob away from the clamp upper portion.
9 . The joint clamp of claim 8 , wherein:
the clamp upper portion comprises a bolt hole; and
the upper spring, via its biasing of the knob, partially retracts the bolt lower portion into the bolt hole.
10 . The joint clamp of claim 1 , wherein the spring causes the lower clamp portion to generate an audible sound in response to snapping toward the clamp upper portion.
11 . A joint clamp for a surgical retractor system, the joint clamp comprising:
a handle;
a clamp upper portion;
a clamp lower portion pivotally coupled to the clamp upper portion, wherein the clamp lower portion comprises threads;
a clamping passage that passes between the clamp upper portion and the clamp lower portion;
a bolt that passes through the clamp upper portion, wherein the bolt comprises a bolt upper portion coupled to the handle and a bolt lower portion comprising threads; and
a spring that exerts a biasing force on the clamp lower portion and pivots the threads of the lower clamp portion toward the threads of the bolt lower portion; and
wherein rotation of the handle in a first direction rotates the bolt and causes the threads of the bolt lower portion to engage the threads the clamp lower portion, draw the clamp lower portion toward the clamp upper portion, and reduce the clamping passage between the clamp upper portion and the clamp lower portion.
12 . The joint clamp of claim 11 , wherein rotation of the handle in the first direction increases a clamping force exerted upon an object in the clamping passage.
13 . The joint clamp of claim 11 , wherein the spring comprises one or more torsion springs that engage the clamp upper portion and the clamp lower portion and collectively exert the biasing force upon the clamp lower portion.
14 . The joint clamp of claim 13 , comprising a pivot pin that laterally passes through the clamp upper portion and the clamp lower portion.
15 . The joint clamp of claim 14 , wherein the clamping passage is positioned between the pivot pin and the bolt lower portion.
16 . The joint clamp of claim 14 , wherein ends of the clamp upper portion and the clamp lower portion that are distal from the pivot pin are tapered to laterally guide an object into the clamping passage.
17 . The joint clamp of claim 11 , wherein the biasing force exerted by the spring is sufficient to overcome a gravitational force exerted on the clamp lower portion and abut the threads of the clamp lower portion against the threads of the bolt lower portion.
18 . The joint clamp of claim 11 , comprising:
an upper spring between the handle and the clamp upper portion; and
wherein the upper spring biases the handle away from the clamp upper portion.
19 . The joint clamp of claim 18 , wherein:
the clamp upper portion comprises a bolt hole; and
the upper spring, via its biasing of the handle, partially retracts the bolt lower portion into the bolt hole.
20 . The joint clamp of claim 11 , wherein the spring causes the lower clamp portion to generate an audible sound in response to snapping toward the clamp upper portion.