US 12,310,626 B2
External distractor and adjustment device for use in such a distractor
Thijmen Struik, Montfoort (NL); Floris Paulus Jacobus Gerardus Lafeber, Houten (NL); Vincent Marianus Cloostermans, Enschede (NL); and Karianne Hide Lindenhovius, De Meern (NL)
Assigned to ARTHROSAVE HOLDING B.V., Culemborg (NL)
Appl. No. 17/638,032
Filed by ARTHROSAVE HOLDING B.V., Calemborg (NL)
PCT Filed Aug. 26, 2019, PCT No. PCT/EP2019/072715
§ 371(c)(1), (2) Date Feb. 24, 2022,
PCT Pub. No. WO2021/037336, PCT Pub. Date Mar. 4, 2021.
Prior Publication US 2022/0280195 A1, Sep. 8, 2022
Int. Cl. A61B 17/64 (2006.01); A61B 17/66 (2006.01)
CPC A61B 17/6458 (2013.01) [A61B 17/66 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An external distractor arranged to gradually enlarge the distance between a first bone part and a second bone part, wherein the distractor comprises:
a first and a second connection device, wherein the first connection device is arranged to be connected to the first bone part with at least one first bone pin and wherein the second connection device is arranged to be connected to the second bone part with at least one second bone pin,
wherein the distractor further comprises an adjustment device arranged between the first and second connection devices for adjusting the distance between the first and the second connection devices along an adjustment axis, wherein the adjustment device comprises a tubular base body coupled to the first connection device, an extension tube coupled to the second connection device and an adjustment mechanism for moving the extension tube with respect to the base body along the adjustment axis,
wherein the adjustment mechanism comprises a rotatable adjustment ring for moving the extension tube upon rotation of the adjustment ring around the adjustment axis,
wherein the adjustment mechanism further comprises at least one spring member engaging the adjustment ring for preventing unintended activation of the adjustment mechanism, wherein the adjustment ring is movable between a locked position, in which rotation of the ring is prevented, and an unlocked position in which the ring is rotatable, and wherein the spring member is arranged to urge the adjustment ring towards the locked position, wherein the adjustment ring is movable along the adjustment axis between the locked and unlocked positions, and
wherein the adjustment ring and the base body of the adjustment device comprise a cooperating groove-notch mechanism comprising at least one groove and one corresponding notch, wherein rotation of the adjustment ring is prevented when the notch is received in the groove.