Surgical cable tensioner
In accordance with one aspect of the present disclosure, an instrument for tensioning a surgical cable is provided that includes a rotary tensioner that is rotatable in a tensioning rotary direction to apply tension to the surgical cable. The instrument further includes a body supporting the rotary tensioner, a pawl portion of the body configured to be received at least partially in a recess of a ratchet gear of the rotary tensioner, and a living hinge portion of the body supporting the pawl portion. The living hinge portion is configured to permit the pawl portion to be shifted out of the recess and shifted into an adjacent recess of the ratchet gear with turning of the rotary tensioner in the tensioning rotary direction
1. An instrument for tensioning a surgical cable, the instrument comprising:
a rotary tensioner rotatable in a tensioning rotary direction to apply tension to a surgical cable;
a ratchet gear of the rotary tensioner having a plurality of recesses;
a body supporting the rotary tensioner;
a pawl portion of the body configured to be received at least partially in one of the recesses of the ratchet gear; and
a living hinge portion of the body supporting the pawl portion and configured to permit the pawl portion to be shifted out of the one recess and shifted into an adjacent one of the recesses of the ratchet gear with turning of the rotary tensioner in the tensioning rotary direction.
2. The instrument of claim 1 wherein the living hinge portion includes a base portion and an elongate arm portion extending away from the base portion toward the pawl portion.
3. The instrument of claim 1 wherein the body includes a through opening extending along opposite sides of the living hinge portion and about the pawl portion to define an outer periphery of the pawl portion and the living hinge portion.
4. The instrument of claim 1 wherein the body includes a second living hinge portion and a second pawl portion supported by the second living hinge portion and configured to be received at least partially in one of the recesses of the ratchet gear, the second living hinge portion configured to permit the second pawl portion to be shifted out of the one recess and at least partially into an adjacent one of the recesses of the ratchet gear with turning of the rotary tensioner in the tensioning rotary direction.
5. The instrument of claim 4 wherein the pawl portions and living hinge portions are configured so that one of the pawl portions is always received at least partially in one of the recesses of the ratchet gear to resist turning of the rotary tensioner in a pay out rotary direction.
6. The instrument of claim 1 wherein the body has a one-piece construction so that the living hinge portion and the pawl portion are integrally formed.
7. The instrument of claim 6 wherein the rotary tensioner includes a handle fixed relative to the ratchet gear and the rotary tensioner has a one-piece construction.
8. The instrument of claim 6 wherein the body is of a plastic material.
9. The instrument of claim 1 wherein the body includes a cavity and the rotary tensioner is at least partially in the cavity.
10. The instrument of claim 1 wherein the ratchet gear includes a plurality of ratchet teeth that define the plurality of recesses therebetween wherein each of the ratchet teeth includes a ramp surface operable to shift the pawl portion radially outward and flex the living hinge portion with turning of the rotary tensioner in the tensioning rotary direction.
11. The instrument of claim 1 further comprising a guide connected to the body at a swivel connection and having a through passage sized to receive a surgical cable.
12. The instrument of claim 11 further comprising a cutting blade mounted to the guide and an actuator operable to shift the cutting blade relative to the guide and cut a surgical cable.
13. An instrument for tensioning a surgical cable, the instrument comprising:
a one-piece body having a cavity;
a rotary tensioner at least partially in the cavity and rotatable relative to the body in a tensioning rotary direction to wind a surgical cable onto the rotary tensioner;
ratchet portions of the one-piece body and the rotary tensioner configured to permit the rotary tensioner to turn in the tensioning rotary direction and resist turning of the rotary tensioner in an opposite, pay out rotary direction.
14. The instrument of claim 13 wherein the ratchet portions include a pawl portion of the one-piece body and a ratchet gear of the rotary tensioner.
15. The instrument of claim 13 wherein the ratchet portions include a first pawl portion and a second pawl portion of the one-piece body and a ratchet gear of the rotary tensioner.
16. The instrument of claim 13 wherein the ratchet portions include a pawl portion of the one-piece body and the one-piece body includes a living hinge connected to the pawl portion that permits the pawl to pivot relative to the rotary tensioner.
17. The instrument of claim 13 further comprising a tubular member connected to the one-piece body at a swivel connection and having a through passage sized to receive a surgical cable.
18. The instrument of claim 17 further comprising a cutting blade mounted to the tubular member and an actuator operable to shift the cutting blade relative to the tubular member and cut a surgical cable.
19. A method of tensioning a surgical cable, the method comprising:
turning a rotary tensioner in a tensioning direction relative to a body to wind a surgical cable onto the rotary tensioner; and
flexing a living hinge of the body to permit a pawl portion of the body to shift from a first recess to a second recess of the rotary tensioner.
20. The method of claim 19 wherein flexing the living hinge of the body includes cammingly engaging the pawl portion of the body with a tooth of the rotary tensioner to shift the pawl portion out of the first recess of the rotary tensioner.