Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/38—Joints for elbows or knees
  • A61F2/389—Tibial components
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2/38—Joints for elbows or knees
  • A61F2/3886—Joints for elbows or knees for stabilising knees against anterior or lateral dislocations
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30428—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by inserting a protrusion into a slot
  • A61F2002/30429—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by inserting a protrusion into a slot made by inserting a hook into a cooperating slot
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/30—Joints
  • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
  • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
  • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
  • A61F2002/30476—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements locked by an additional locking mechanism
  • A61F2002/305—Snap connection

Definitions

• Tibial part and tibial insert of a knee prosthesis comprising a promontory and an associated cutout
• jl_a present invention relates to a knee prosthesis comprising a tibial part, a femoral part and a tibial insert of a less hard material interposed between the tibial part and the femoral part.
• the present invention also relates to a tibial part of a prosthesis of this kind and in particular to a tibial part comprising a tibial plate and an insert intended to be fixed, in particular by snap-fastening, on the tibial plate of the tibial part.
• the present invention also relates to a tibial insert intended to be fixed, in particular by snap-fastening, to a tibial plate of a tibial part according to the invention.
• the tibial prosthesis comprises a tibial part, consisting of a tibial plate and a keel intended to be anchored in the tibia for fixing the tibial part to the tibia, and a femoral part comprising condyles.
• a tibial part consisting of a tibial plate and a keel intended to be anchored in the tibia for fixing the tibial part to the tibia
• a femoral part comprising condyles.
• an insert conventionally made of polyethylene, which has curved upper surfaces intended to come into congruence with the condyles of the femoral part to allow the relative flexion of the tibial part with respect to the part femoral to imitate the movement of the knee.
• the tibial plateau has two abutments which are distinct from each other and which extend along the peripheral edge of the tibial plateau, namely an anterior abutment extending along at least part of the anterior edge of the tibial plateau and a posterior abutment having a promontory portion extending from the posterior edge towards the anterior abutment and having the shape of a promontory.
• the tibial insert intended to cooperate with such a tibial part comprises in its lower part cavities, namely an anterior lower cutout intended to cover the anterior abutment of the tibial plate and a lower posterior cutout intended to cover the promontory forming part.
• An anterior tab protrudes from the anterior face of the insert and is intended to be hooked by snap-fastening in a central cutout opening out to the posterior face of the anterior stop.
• the insert further comprises two rear legs intended to be inserted into grooves formed in the rear stop.
• a tibial part of a total knee prosthesis is as defined in claim 1.
• This aspect of the invention also relates to a tibial plate for a tibial part of a total knee prosthesis comprising anchoring means, in particular in the form of a keel, coming from its underside, at least two distinct stops. one of the other, respectively anterior and posterior, projecting from its upper face, the anterior abutment extending along at least part of the anterior edge of the tibial plateau and the posterior abutment extending along at least less a part of the posterior edge of the tibial plateau and comprising a promontory part extending from the posterior edge in the direction of the anterior stop and having the shape of a promontory, and a central front cutout in the form of a window being formed in the stop anterior by opening from the posterior face thereof opposite the promontory part, the promontory part being symmetrical with respect to the antero-posterior axis AP or sagittal.
• anchoring means in particular in the form of a keel, coming from its underside, at least two
• This aspect of the invention also relates to a tibial insert for a tibial part of a knee prosthesis having an upper face (23), a lower face (22) and a lateral face, the lateral face comprising an anterior face, a posterior face and two sides respectively lateral and medial side, a posterior cutout (26; 26 ') of open insert on the top and of the posterior side being formed in the lower face, the posterior cutout being delimited by an anterior face in withdrawal from the rear face of the insert and having a region of shape complementary to the promontory part, characterized in that at least one elastic tab, in particular in the form of a hook, protrudes from the insert on the side anterior, especially centrally, so as to be able to penetrate, in particular by snap-fastening, into an anterior cutout (1 1) in the form of a window of a tibial part.
• a tibial plateau of a tibial part of a total knee prosthesis comprises anchoring means, for example an anchoring keel, the keel projecting from the underside of the tibial plateau, while at least two abutments distinct from each other, respectively anterior and posterior, protrude from the upper face of the tibial plateau, the anterior stop extending along at least part of the anterior edge of the tibial plateau and the posterior abutment extending along at least part of the posterior edge of the tibial plateau and comprising a promontory part extending, preferably centrally along the sagittal axis, from the rear edge towards the anterior stop and having the shape of a promontory, and two rear walls extending along the posterior edge of the tibial plateau on either side of the promontory part, two respective posterior grooves being formed on the anterior side in the two posterior walls and a central anterior window-
• anchoring means for example an anchoring keel, the keel projecting from the underside
• This other aspect of the invention also relates to a tibial insert having an upper face, a lower face and a lateral face, the lateral face comprising an anterior face, a posterior face and two sides of the lateral and medial side respectively, and a posterior insert cutout open on the underside and on the posterior side being formed in the lower face and being delimited by an anterior face set back with respect to the posterior face of the pinsert lateral face, the posterior insert cutout having a region of complementary shape of a part forming a promontory having an elongated shape in the sagittal direction, that is to say that its largest dimension in the sagittal or antero-posterior direction, is greater than its largest dimension in the medio-lateral direction, an elastic tab in hook shape projecting from one side of the insert, on the front side, and two rear ribs projecting from the front side on either side medially and laterally from the region of shape complementary to a promontory part, the part of the face of the insert from which the elastic tab extend
• the above aspect of the invention also relates to a tibial part comprising the insert and the plate defined above.
• a tibial plateau of a tibial part of a prosthesis total knee includes anchoring means, for example an anchoring keel, the keel projecting from the underside of the tibial plateau, while at least two abutments distinct from each other, respectively anterior and posterior, protrude from the upper face of the tibial plateau, the anterior stop extending along at least part of the anterior edge of the tibial plateau and the posterior stop extending along at least part of the posterior edge of the plateau tibial and comprising a promontory portion extending, preferably centrally along the sagittal axis, from the posterior edge towards the anterior stop and having the shape of a promontory, at least one decoration anterior upe, in particular a central cutout, preferably in the form of a window, being formed in the anterior abutment opening out from the posterior face thereof,
• This yet another aspect of the invention also relates to a tibial insert having an upper face, a lower face and a lateral face, the lateral face comprising a front face, a rear face and two sides of the lateral and medial side respectively, an anterior insert cutout formed in the underside of the insert, on the anterior side, this anterior insert cutout being delimited by a posterior face and a top face, being open on the anterior side and on the underside, and a posterior insert cutout open on the top and on the posterior side being formed in the lower face and being delimited by an anterior face set back with respect to the posterior face of the insert, the posterior insert cutout having a region of complementary shape of a promontory part, in particular of a promontory part having an elongated shape in the sagittal direction, that is to say say that its largest dimension in the sagittal or antero-posterior direction, is greater than its largest dimension in the medio-lateral direction, the posterior face of the anterior insert cutout having a central section extending
• the above aspect of the invention also relates to a tibial part comprising the insert and the plate defined above.
• a tibial plateau of a tibial part of a prosthesis total knee includes anchoring means, for example an anchoring keel, the keel projecting from the underside of the tibial plateau, while at least two abutments distinct from each other, respectively anterior and posterior, protrude from the upper face of the tibial plateau, the anterior stop extending along at least part of the anterior edge of the tibial plateau and the posterior stop extending along at least part of the posterior edge of the plateau tibial and comprising a promontory portion extending, preferably centrally along the sagittal axis, from the posterior edge towards the anterior stop and having the shape of a promontory, and at least one d anterior cut, in particular central, being formed in the anterior stop opening out of the rear face thereof, in particular in front of the promontory part, is characterized in that
• This yet another aspect of the invention also relates to a tibial insert having an upper face, a lower face and a lateral face, the lateral face comprising a front face, a rear face and two sides of the lateral and medial side respectively, a posterior insert cutout open on the top and on the posterior side being formed in the underside of the insert and being delimited by an anterior face set back with respect to the posterior face of the insert, the posterior insert cutout having a region of complementary shape to a promontory portion having an elongated shape in the sagittal direction, i.e.
• its largest dimension in the sagittal or antero-posterior direction is greater than its largest dimension in the medio-lateral direction, and it is formed on the anterior side of the posterior insert cutout, in the region complementary to the party e forming a promontory, vertical grooves, and at least one elastic tab in the form of a hook projecting from the rear face of the insert, in particular centrally.
• the above aspect of the invention also relates to a tibial part comprising the insert and the plate defined above.
• Yet another aspect of the invention relates to a tibial plateau of a tibial part of a total knee prosthesis comprising anchoring means, in particular in the form of a keel coming from the underside of the tibial plateau, at least two abutments distinct from each other, respectively anterior and posterior, projecting from the upper face of the tibial plateau, the anterior stop extending along at least a portion of the anterior edge of the tibial plateau and the posterior abutment extending along at least a portion of the posterior edge of the tibial plateau and having a portion forming promontory (14; 14 '; 14 ”) extending from the rear edge towards the stop anterior and having the shape of a promontory, and an anterior cutout (1 1) in the form of a window being formed in the anterior stop (4; 4 ') by opening from the rear face (7; 7') thereof in front of the part (
• This other aspect of the invention also relates to a tibial insert having an upper face, a lower face and a lateral face, the lateral face comprising an anterior face, a posterior face and two sides sides respectively lateral and medial, a cutout.
• posterior insert open on the top and on the posterior side being formed in the lower face of the insert and being delimited by an anterior face recessed with respect to the posterior face of the insert and two medial and lateral faces respectively joining together on the anterior face, the medial and lateral faces and the anterior face of the posterior insert cutout are straight, inclined inward or curved so as not to have upper grip edges.
• the above aspect of the invention also relates to a tibial part comprising the insert and the plate defined above.
• a tibial plateau of a tibial part of a total knee prosthesis comprising anchoring means, in particular in the form of a keel coming from the underside of the tibial plateau, at least two abutments distinct from each other, respectively anterior and posterior, projecting from the upper face of the tibial plateau, the anterior stop extending along at least a portion of the anterior edge of the tibial plateau and the posterior abutment extending along at least a portion of the posterior edge of the tibial plateau and having a portion forming promontory (14; 14 '; 14 ”) extending from the rear edge towards the anterior stop and having the shape of a promontory, and an anterior cutout (1 1) in the form of a window being formed in the anterior stop (4; 4 ') emerging from the face (7; 7 ') posterior thereof opposite the part (14;
• This other aspect of the invention also relates to a tibial insert having an upper face, a lower face and a lateral face, the lateral face comprising an anterior face, a posterior face and two sides sides respectively lateral and medial, a cutout.
• posterior insert open on the top and on the posterior side being formed in the underside of the insert and being delimited by an anterior face recessed with respect to the posterior face of the insert, the posterior insert cutout having a region of complementary shape of a promontory forming part having an elongated shape, that is to say that its greatest dimension in length, that is to say in the antero-posterior direction, or AP, is greater than its largest dimension in width, that is to say in the direction ML or medio-lateral), and symmetrical with respect to the axis AP.
• a fixation is obtained, in particular by snap-fastening, which perfectly holds the tibial insert to the tibial plateau and this with a simple structure.
• the promontory portion is in at least one sagittal segment along the sagittal direction of frustoconical shape, that is to say that its width dimension, measured in the medio-lateral direction, decreases along the to minus one segment directed in the sagittal direction, towards the anterior stop.
• the promontory portion has an elongated shape in the sagittal direction, that is to say that its largest dimension in the sagittal or antero-posterior direction, is greater than its largest dimension in the medio-lateral direction .
• the at least one sagittal segment extends from the posterior edge to an anterior end of the promontory portion.
• the promontory part is delimited on the lateral side and on the medial side by two plane faces, preferably vertical, extending from the edge posterior and converging towards each other to meet at their other anterior end by a substantially circular segment forming a vertex.
• the angle formed between the two flat faces on the lateral side and on the medial side of the promontory portion is between 2 ° and 20 °, for example between 3 ° and 10 °.
• the posterior cutout has a region of shape complementary to a promontory portion having an elongated shape in the sagittal direction, that is to say that its largest dimension in the sagittal or antero-posterior direction, is greater. at its largest dimension in the medio-lateral direction.
• the complementary region of the promontory part is in at least one sagittal segment along the sagittal direction of frustoconical shape, that is to say that its width dimension, measured in the medio-lateral direction, decreases along the at least one segment directed in the sagittal direction.
• an anterior insert cutout is formed in the underside of the insert, on the anterior side, this anterior insert cutout is delimited by a posterior face and a top face, being open on the anterior side and on the underside, the elastic tab being received at least partially in this anterior insert cutout.
• the promontory part is full and in particular does not have a bore intended to receive a stud from the underside of the tibial insert.
• the lateral faces of the medial side and / or of the lateral side of the promontory part are planar.
• the lateral face or faces on the medial side and / or on the lateral side of the promontory part is or are vertical.
• a single cutout is provided in the rear face of the anterior stop.
• the tibial part is symmetrical with respect to the sagittal axis.
• the central cutout opening to the anterior face of the first anterior stop extends over a width, measured in the medio-lateral direction, which is greater than the width or the largest dimension in width of the promontory portion.
• the present invention also relates to a total knee prosthesis comprising a tibial plate according to the invention, a femoral part and a tibial insert according to the invention fixed, in particular by snap-fastening, to the tibial plate of the tibial part and interposed between the part tibiale and the femoral part.
• Figure 1 is a perspective view from above of a tibial plateau according to a first embodiment of the invention
• Figure 2 is a perspective view along another angle of the tibial plateau of Figure 1;
• Figure 3 is a perspective view from below of a tibial insert intended to cooperate with the tibial plateau of Figure 1;
• Figure 4 is another perspective view of the tibial pinsert of Figure 3;
• Figure 5 is a perspective view from above of another embodiment of a tibial plateau according to the invention.
• Figure 6 is a top view of the tibial plateau of Figure 5;
• Figure 7 is a perspective view from below of a tibial insert intended to cooperate with a tibial plateau corresponding to that of Figures 5 and 6 in which however the anterior stop has been replaced by the anterior stop of the plateau of Figures 1 and 2 ;
• Figure 8 is a bottom view of Pinsert of Figure 7;
• Figure 9 is a perspective view from above of a third embodiment of a tibial plateau according to the invention.
• Figure 10 is a top view of the tibial plateau of Figure 9;
• Figure 11 is a perspective view according to a fourth embodiment of a tibial plateau according to the invention.
• Figure 12 is a top view of the tibial plateau of Figure 11;
• Figure 13 is a top view of the tibial insert of Figures 3 or 4;
• Figure 14 is a perspective view from above of the tibial insert of Figure 13;
• Figure 15 is a view of the anterior side of the tibial insert of Figures 13 and 14;
• Figure 16 is a side view of the tibial insert of Figures 13 to 15;
• Figure 17 is a perspective view of a tibial insert intended to cooperate with the tibial plateau of Figures 9 and 10;
• Figure 18 is a perspective view from above of an insert according to yet another embodiment which can cooperate with the tibial plateau of Figure 11;
• FIG. 19 is a perspective view from above of an insert according to yet another embodiment which can cooperate with the tibial plateau of FIG. 11.
• the figures represent different embodiments, respectively of a tibial part and a tibial insert of a total knee prosthesis comprising a tibial part, a femoral part and the tibial insert disposed between the tibial part and the femoral part.
• These embodiments illustrate the different aspects of the invention, each embodiment incorporating one or more of the aspects of the invention.
• a tibial part 1 comprises a tibial plate 2 and a keel 3 projecting from the underside of the tibial plate 2 and intended to be anchored in the tibia for fixing the tibial part to the tibia .
• Other anchoring means than a keel as described in Figure 1 can be provided while remaining within the scope of the present invention.
• Two parts forming a stop protrude from the upper face of the tibial plateau 2, namely a part 4 forming a front stop and a part 5 forming a rear stop.
• the part 4 forming anterior stop is defined by an anterior vertical face 6 extending along the curved anterior edge of the tibial plateau 2, a posterior vertical face 7 extending more posteriorly inside the plateau 2 and an upper face 8 extending between the two anterior and posterior faces 6.
• the rear vertical face 7 of the part 4 forming an anterior stop comprises a region 9 central and two regions 10L and 10M of medial and lateral end.
• a central cutout 11 in the form of a window having an opening whose peripheral edge is in the vertical plane and is of elongated rectangular shape.
• This window-shaped cutout 11 is said to be central because it cuts the sagittal, or antero-posterior axis, of the tibial plateau, in particular is symmetrical with respect to this axis by being cut by the latter.
• the central window-shaped cutout 11 has an upper edge defined by the stop 4, this edge allowing the hook to be hooked by a hooking tab 29 coming from the tibial insert described below.
• the part 5 forming the posterior stop comprises two vertical lateral and medial stops, respectively 12L and 12M, and a central part 14 in the form of a promontory, which extends in the anteroposterior direction from the posterior edge of the tibial plateau 2 in the direction of the part 4 forming an anterior stop, but however remaining at a distance therefrom.
• the two vertical stops 12L and 12M medial and lateral extend parallel to the medio-lateral direction along the posterior edge.
• the part 14 forming a promontory is delimited by two vertical faces 17L and 17M, an upper face 16 and an anterior face 18 forming a vertex connecting the two faces 17L and 17M by means of rounded junction sections.
• the part 14 forming a promontory is connected to the two rear stops 12L and 12M by two vertical walls 20L and 20M, which make an angle relative to each other, but which do not have grooves, unlike the stops 12L and 12M posterior.
• the planes defined by the posterior faces formed by the two end regions 101 and 10M form an angle relative to the plane defined by the central region which is for example 150 °.
• the two lateral and medial faces 17L and 17 M are in the embodiment of Figures 1 to 4 parallel, in particular parallel to the antero posterior or sagittal direction. According to another embodiment, they could be mutually inclined, for example by an angle between 3 ° and 15 °, so that the promontory part would have a frustoconical shape on a segment extending from the rear edge of the plate to 'with rounded junctions with the face 18 forming a vertex.
• FIGS. 3 and 4 there is shown a tibial insert intended to cooperate with the tibial part of FIGS. 1 and 2.
• the tibial insert is conventionally made of a softer material than the material from which the tibial part is made, for example the tibial insert is made of polyethylene while the tibial part (as well as the femoral part not shown) is made of metal.
• the insert has a shape substantially corresponding to the shape of the tibial plateau 2. It is delimited by a lower face 22, an upper face 23 and a lateral face extending all around the insert between the upper and lower faces. It is formed in the lower face 22 of the tibial insert two cutouts, respectively posterior 24 and anterior 25, intended to come to respectively cover the part forming the abutment 5 posterior and the part forming the abutment 4 anterior.
• the cavity 24 is open on the bottom and posteriorly and is delimited by an upper face and an anterior face to define a central region 26 intended to cover the part 14 forming a promontory and two lateral regions 27L and 27M intended to cover the stops 12L and 12M posterior to the 5 posterior stop.
• two ribs 28L and 28M project from the region of the front face of the cutout delimiting the lateral regions 27L and 27M respectively to fit into the grooves 15L and 15M of which they have a complementary shape.
• the cavity 26 has a shape complementary to the part 14 forming a promontory and in particular the vertical side wall defining the cavity 26 has a shape complementary to the faces 17L, 17M and 18 of the part 14 forming a promontory.
• the front lower cutout 25 of the insert has a shape complementary to the part 4 forming an anterior stop.
• the cutout 25 is open on the underside and on the anterior side.
• From the rear vertical face 21 of the cavity 25 protrudes an elastic tab 29 for hooking intended to penetrate by its hooking head into the cutout 11 formed in the anterior stop 4.
• the width of the hooking tab 29, that is to say its dimension in the medio-lateral direction, is greater than the largest dimension in width of the region 26 of the cutout 24 intended to cover the part 14 forming promontory.
• An anterior cut is further formed. auxiliaries above the cutout 25 to assist in the detent removal of Pinsert from the tray.
• the rear face 21 has a central section 21 C and two end sections 21 L and 21 M.
• the respective vertical planes defined by the end regions 21 M and 21 L form an angle with the vertical plane defined by the central region 21 C which is greater than 180 °, for example equal to 210 °.
• the planes defined by the 21 M and 21 L end regions converge from one worm to the other in the anterior direction and diverge from each other in the posterior direction.
• the three planes 21 C, 21 L and 21 M are all parallel, in particular in the medio-lateral direction, as shown in the embodiments of FIGS. 5 and 6 or 9 and 10.
• the snap-fastening of Pinsert to the tibial part is carried out by introduction of the ribs 28L and 28M into the grooves 15L and 15M respectively and the introduction of the promontory part 14 into the region 26 by pushing down, then by the continuation of the downward push for snap-fastening by elastic flap of the hooking tab 29 so that the latter comes to penetrate into the front central cutout 11 to hang on the upper edge thereof and ensure snap-fastening and thus a maintenance of Pinsert on the tibial plateau.
• the upper edges of the vertical faces 17L and 17M are parallel to each other and extend in the sagittal or anteroposterior direction.
• the face 9 is vertical and its upper edge is rectilinear, extending parallel to the medio-lateral axis.
• the two faces 10L and 10M are vertical and their upper edge is rectilinear at an angle with respect to the face 9, so that the two faces 10L and 10M are oriented towards the posterior side.
• the faces 9, 10L and 10M thus define, from one lateral end to the other of the stop 4, a rear surface of the front stop 4 which has a concavity turned in the rear direction.
• FIGS. 5 and 6 Another possible embodiment of a tibial plateau according to the invention and in Figures 7 and 8 another possible embodiment of an insert according to the invention.
• the elements of the tibial plateau and Pinsert are identical to those of the embodiment of Figures 1 and 2, the same reference numbers have been kept.
• the embodiment of FIGS. 5 and 6 has two differences. Each difference can be made independently of each other to thereby form three distinct embodiments, namely an embodiment which includes one of the differences, another embodiment which achieves only the other difference and a third embodiment which realizes the two differences compared to the embodiment of FIGS. 1 and 2.
• the first modification consists in providing on the vertical lateral walls 17'L and 17'M of the promontory 14 'two vertical ribs 30L and 30M which cooperate by snap-fastening with two corresponding cavities 40L and 40M formed in the vertical wall delimiting the cavity 26' in the corresponding tibial insert.
• the promontory 14 ' one can either make the faces 17'L and 17'M as shown in Figures 5 to 8, parallel, or tilt them mutually to give the promontory portion a frustoconical shape at least on one segment extending on the sagittal axis, for example from the rear edge of the plate to the ribs 30M, respectively 30L and / or of these ribs 30M, respectively 30L up to the rounded junctions with the face 18 forming a vertex.
• the other modification consists in making the part 4 'forming an anterior stop, so that it has an anterior vertical face 7' which extends from one end to the other, in a vertical plane, parallel to the axis. lateral medio, without providing end portions inclined with respect to a central portion.
• FIGS. 9 and 10 an embodiment is shown, in which the tibial part is made on the basis of the tibial part of Figures 5 and 6 with the only modification that the promontory part has 17 ”L faces and 17 ”M not parallel as in the embodiments shown in FIGS. 1 and 2 and 5 and 6, but mutually inclined to give the part 14” forming a promontory a frustoconical shape at least on a segment extending on the axis sagittal, for example from the posterior edge of the plate to the rounded junctions with the face 18 forming the apex.
• FIGS. 11 and 12 there is shown an embodiment substantially identical to that of Figures 1 and 2.
• the only difference consists in a modification of the shape of the promontory part which in the embodiment of Figures 1 1 and 12 is made by being slightly conical.
• the side walls 17 ”L and 17 ”M are not, unlike the embodiment of FIGS. 1 and 2, substantially parallel but slightly inclined one and the other while converging towards one another in the direction of the anterior stop.
• the rest of the embodiment of Figures 1 1 and 12 is identical to that of Figures 1 and 2.
• the angle of inclination of the faces 17 ”L and 17” M can preferably be between 2 and 15 °, in particular between 3 and 15 °.
• This modification can also be carried out in the embodiments described in FIGS. 5 to 10.
• the shape of the cutout intended to cover the headland is modified accordingly.
• FIG. 17 there is shown a tibial insert intended to cooperate with the tibial plateau of FIGS. 9 and 10, the insert comprising an anterior cut 25 ′ of complementary shape to the anterior stop 4 ′, the posterior face 21 ′ of the anterior cut 25 'extending along a vertical plane (with the exception of the tab 29) over the entire medio-lateral dimension of the anterior cut 25'.
• FIGS. 18 and 19 two additional embodiments of a tibial insert which can cooperate with the plate of FIG. 1 are shown.
• the tibial insert is such that the regions 26 ”and 26” 'intended to be covered, the promontory-forming part passes through and extends along the anteroposterior axis from the posterior edge to the tab 29.
• the 26 ”region has its two lateral and medial walls which are inclined relative to each other by the same angle as the inclination between the lateral and medial faces of the promontory portion 14” , the inclination continuing until the end of the crossing, that is to say until the tab 29, while in FIG. 19, the inclination of the lateral and medial walls is only present to the end of the 14 "promontory portion, the 26" region having parallel side and medial walls beyond the 14 "promontory portion, to the tab 29.
• FIG. 13 to 16 there is shown an insert of the embodiment described in Figures 3 and 4 respectively in perspective views from above, front and profile. From above, we thus see the two concave faces 42 and 43 upper defined in the upper face 23 and intended to come into contact with the external surfaces of the condyles of the femoral part (not shown in the figures), as well as a stud 44 central intended to penetrate into the intercondylar space to provide guidance during flexion of the femoral part relative to the tibial part.]

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• 2018
  • 2018-07-12 FR FR1870828A patent/FR3083692A1/fr active Pending
• 2019
  • 2019-07-08 EP EP19742539.0A patent/EP3820408A1/de active Pending
  • 2019-07-08 US US17/256,699 patent/US11464642B2/en active Active
  • 2019-07-08 WO PCT/EP2019/068242 patent/WO2020011705A1/fr unknown

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