Carriage for a surgical boot of a hip distractor

1. A limb support comprising

a longitudinal member configured to be coupled to a patient support apparatus, and

a carriage including a space for receiving the longitudinal member, the carriage configured to move linearly along the longitudinal member to a plurality of positions, the carriage including a plurality of rollers supporting the carriage relative to the longitudinal member for movement along the longitudinal member, and a locking mechanism for locking the carriage to the longitudinal member to prevent movement of the carriage relative to the longitudinal member, the locking mechanism including a plurality of elastomeric blocks which are deformed under a load to lock the carriage to the longitudinal member, the locking mechanism configured to maintain the load to lock the carriage to the longitudinal member.

2. The limb support of claim 1 , wherein at least one elastomeric block is deformed by a cam.

3. The limb support of claim 2 , wherein the carriage includes a housing, and the at least one elastomeric block is supported on a plate that is pivotably coupled to the housing.

4. The limb support of claim 3 , wherein the carriage includes an actuator that is movable between a first position wherein the at least one elastomeric block is subjected to a first load which permits relative movement between the at least one elastomeric block and the longitudinal member and a second position wherein the at least one elastomeric block is subjected to a second load which deforms the elastomeric block sufficiently to prevent movement between the at least one elastomeric block and the longitudinal member under normal operating conditions.

5. The limb support of claim 1 , wherein at least one of the plurality of rollers includes a guide surface that engages a portion of the longitudinal member to prevent lateral movement of the carriage relative to the longitudinal member.

6. The limb support of claim 5 , wherein the longitudinal member includes an upper surface and a lower surface and wherein the plurality of rollers includes a first roller supporting the carriage relative to the upper surface of the longitudinal member and a second roller supporting the carriage relative to the lower surface of the longitudinal member.

7. The limb support of claim 6 , wherein the longitudinal member further includes first and second lateral surfaces and wherein the first and second rollers are formed to include surfaces that engage the first and second lateral surfaces of the longitudinal member.

8. The limb support of claim 1 , wherein at least one of the plurality of rollers includes a tread configured to resist rolling to dampen movement of the carriage along the longitudinal member.

9. A carriage for a limb support comprising

a space for receiving a longitudinal member of a patient support apparatus,

a plurality of rollers configured to engage the longitudinal member, the plurality of rollers configured to maintain alignment of the carriage during movement of the carriage along the longitudinal member,

a locking mechanism configured to secure the carriage to the longitudinal member at any of an infinite number of positions along the length of the longitudinal member, the locking mechanism being lockable with a single action to independently maintain the load to lock the carriage to the longitudinal member.

10. The carriage of claim 9 , wherein the locking mechanism includes a cam acting on a deformable block to engage the deformable block with the longitudinal member to secure the carriage to the longitudinal member.

11. The carriage of claim 9 , wherein the carriage further comprises a housing defining the space, the locking mechanism including a plate pivotably coupled to the housing, a deformable block positioned on the plate and extending into the space, the deformable block configured to engage the longitudinal member, a cam supported from the housing, the cam configured to engage the plate to cause the plate to pivot between an unlocked position and a locked position, and an actuator movable between a first position wherein the locking mechanism is unlocked and a second position wherein the locking mechanism is locked.

12. A limb support comprising

a longitudinal member configured to be coupled to a patient support apparatus,

a carriage including a space for receiving the longitudinal member, the carriage configured to move linearly along a length of the longitudinal member,

a plurality of rollers configured to engage the longitudinal member, the plurality of rollers configured to maintain alignment of the carriage during linear movement of the carriage along the length of the longitudinal member, and

a locking mechanism configured to secure the carriage to the longitudinal member at any of an infinite number of positions along the length of the longitudinal member, the locking mechanism being lockable with a single action to maintain locking mechanism in a locked position to secure the carriage to the longitudinal member.

13. The carriage of claim 12 , wherein the locking mechanism includes a cam acting on a deformable block to engage the deformable block with the longitudinal member to secure the carriage to the longitudinal member.

14. The carriage of claim 12 , wherein the carriage further comprises a housing defining the space, the locking mechanism including a plate pivotably coupled to the housing, a deformable block positioned between the plate in the space, the deformable block configured to engage the longitudinal member, a cam supported from the housing, the cam configured to engage the plate to cause the plate to pivot between an unlocked position and a locked position, and an actuator movable between a first position wherein the locking mechanism is unlocked and a second position wherein the locking mechanism is locked.

15. The limb support of claim 12 , wherein the locking mechanism includes an elastomeric material that engages at least one surface of the longitudinal member to resist movement relative to the longitudinal member.

16. The limb support of claim 12 , wherein the locking mechanism includes an annular member supported on a roller, the annular member deformable under a load to resist rotation of the roller relative to the longitudinal member.

17. The limb support of claim 12 , wherein the locking mechanism includes an elastomeric block that is deformable under a load, the elastomeric block configured to engage at least one surface of the longitudinal member to limit movement between the carriage and the longitudinal member.

18. The limb support of claim 17 , wherein the elastomeric block is deformed by a cam.

19. The limb support of claim 18 , wherein the carriage includes a housing, and the at least one elastomeric block is supported on a plate that is pivotably coupled to the housing.

20. The limb support of claim 19 , wherein the carriage includes an actuator that is movable between a first position wherein the at least one elastomeric block is subjected to a first load which permits relative movement between the at least one elastomeric block and the longitudinal member and a second position wherein the at least one elastomeric block is subjected to a second load which deforms the elastomeric block sufficiently to prevent movement between the at least one elastomeric block and the longitudinal member under normal operating conditions.