Arthrodesis device
The invention relates to an ankle arthrodesis device comprising a pin ( 1 ) intended to be implanted in a tibia (Ti), a talus (Ta) and a calcaneus (Ca), the pin ( 1 ) comprising a proximal portion ( 2 ) extending along a first direction (A-A′), and a distal portion ( 4 ) extending along a second direction (B-B′) that intersects the first direction (A-A′), the distal portion ( 4 ) being provided with a first oblong attachment opening along the second direction (B-B′), the device comprising a first compressive attachment means ( 9 A), of the compression screw type ( 9 A), the pin ( 1 ) being designed and configured such that, when it is implanted with its distal portion ( 4 ) oriented toward the back of the ankle, the first attachment opening is arranged to receive and guide the first attachment means ( 9 A) along a first attachment direction (F 1 -F 1 ′) extending along said talus (Ta) and calcaneus (Ca) to attach the nail to the talus (Ta) and to the calcaneus (Ca).
1 . An ankle arthrodesis device comprising a nail configured for implantation in a tibia, a talus and a calcaneus of a patient, the nail comprising:
a proximal portion which generally extends according to a first longitudinal direction of extension;
a distal portion which extends from the proximal portion and generally extends according to a second longitudinal direction of extension with respect to the first longitudinal direction of extension, the distal portion being provided with a first fastening orifice which is oblong according to the second longitudinal direction of extension;
wherein the distal portion of the nail is adapted to extend through the calcaneus in an oblique configuration with respect to an axis of vertical extension of the tibia;
the device comprising a first compressive fastening means, comprising a compressive screw, the nail being designed and configured so that, when the nail is implanted with said distal portion directed rearwards of the ankle of the patient, said first fastening orifice is arranged so as to receive and guide the first fastening means according to a first fastening direction which is adapted to extend through the talus and calcaneus so as to fasten the nail to the talus and the said calcaneus;
wherein an oblong-shaped fastening orifice is configured to fasten the proximal portion of the nail to the tibia while keeping translational freedom of the nail within the tibia;
wherein a third second fastening direction F 3 -F 3 ′ is orthogonal with respect to a main plane, comprising one or more directions of extensions of the proximal and distal portions of the nail;
the third second fastening direction F 3 -F 3 ′ comprising a middle-lateral talar fastening direction;
a longitudinal groove configured to block rotation of the nail about the first longitudinal direction of the extension, the longitudinal groove arranged symmetrically on either side of a main plane, thereby facilitating identification of an orientation of the main plane;
wherein the extensions are inscribed within the main plane;
a marker element comprising a notch formed in the nail at a level of a free distal end; and
an instrument comprising a removable and tubular interface that sets the nail in place using a plantar approach, the instrument configured to be removably coupled to a distal end of the nail.
2 . The device according to claim 1 , wherein the first and second directions of extension comprise a first angle comprised between 5 and 10°.
3 . The device according to claim 1 , wherein the nail is configured and dimensioned so that, when the nail is implanted, the main plane is configured to be parallel to a sagittal plane of the patient.
4 . The device according to claim 1 , wherein the distal portion is provided with a second fastening orifice, which is configured to receive and guide a second fastening means according to a second fastening direction, thereby configured to fasten the nail to the calcaneus.
5 . The device according to claim 1 , wherein the proximal portion further comprises an additional fastening orifice, which is configured to receive and guide an additional fastening means according to an additional fastening direction.
6 . The device according to claim 5 , wherein the additional fastening direction is orthogonal to the main plane.
7 . The device according to claim 6 , wherein the additional fastening orifices has an oblong shape according to the first direction of extension.
8 . A method for carrying out an arthrodesis of an ankle joint of a patient, comprising:
setting a nail in place within the joint of the ankle patient, wherein during a step of setting the nail in place, the nail is:
implanted in the joint of the ankle so that a distal portion of the nail is directed rearwards of the ankle of the patient and simultaneously fastened to a talus and to a calcaneus via a fastening orifice, using a first compressive fastening means received and guided within the first fastening orifice;
wherein an oblong-shaped fastening orifice is configured to fasten a proximal portion of the nail to the tibia while keeping translational freedom of the nail within the tibia;
wherein a longitudinal groove is configured to block rotation of the nail about a first longitudinal direction of extension, the longitudinal groove arranged symmetrically on either side of a main plane;
configuring a third fastening direction F 3 -F 3 ′ in an orthogonal orientation with respect to the main plane, comprising one or more directions of extension of the proximal and distal portions of the nail;
adapting the distal portion of the nail to extend through the calcaneus in an oblique configuration with respect to an axis of vertical extension of the tibia;
wherein the directions of extension are inscribed within the main plane;
the third fastening direction F 3 -F 3 ′ comprising a middle-lateral talar fastening direction;
a marker element comprising a notch formed in the nail at a level of a free distal end; and
providing an instrument comprising a removable and tubular interface that sets the nail in place within the joint of the ankle of the patient through a plantar approach, wherein the instrument may be removably coupled to a distal end of the nail.