US20140066998A1 - Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) - Google Patents
Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) Download PDFInfo
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- US20140066998A1 US20140066998A1 US13/604,798 US201213604798A US2014066998A1 US 20140066998 A1 US20140066998 A1 US 20140066998A1 US 201213604798 A US201213604798 A US 201213604798A US 2014066998 A1 US2014066998 A1 US 2014066998A1
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- screw
- tapped hole
- implantable part
- assembly according
- bone
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8052—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded
- A61B17/8057—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates immobilised relative to screws by interlocking form of the heads and plate holes, e.g. conical or threaded the interlocking form comprising a thread
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
- A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
- A61B17/8066—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones for pelvic reconstruction
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8605—Heads, i.e. proximal ends projecting from bone
- A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
- A61B17/8615—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the central region of the screw head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
- A61B17/8625—Shanks, i.e. parts contacting bone tissue
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
Definitions
- FIG. 10 is a developed view of the hole, with a diagrammatic indication of the position of the turn of the thread of the screw according to three angulations, showing an absence of screw thread jump;
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Neurology (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Abstract
An assembly including an implantable part designed to be fastened to at least one bone or bone portions to be joined and at least one screw for fastening the implantable part to the at least one bone or bone portions. The implantable part includes at least one tapped hole and the screw includes a head designed to be engaged in the tapped hole. The tapped hole is cylindrical and includes at least one radial notch emerging in a surface of the implantable part through which the screw is designed to be engaged in the tapped hole. The radial notch produces an interruption in the tapping included by the tapped hole. The head of the screw is conical, with an apical angle of between 15 and 25°.
Description
- The present invention relates to an assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s). Said implantable part may in particular be a fastening base for fastening part of a joint prosthesis to a bone, in particular a fastening base for fastening a glenoid to shoulder blade in a total shoulder prosthesis; the implantable part may also be a cortical plate or any other piece of arthrodesis or osteosynthesis equipment.
- It is well known to use screws to fasten implantable parts such as bases used to fasten joint prosthesis components or cortical or similar plates serving to perform an arthrodesis or osteosynthesis of one or more bones.
- A very traditional base or plate comprises smooth cylindrical holes in which the fastening screws are designed to be engaged. Each hole may be adjusted to the dimension of the screw designed to be engaged in that hole, thereby defining a single implantation direction of the screw, or may have a diameter larger than that of the screw, to allow implantation of the screw in a plurality of implantation directions.
- In the first case, the base of the plate has the drawback of imposing an implantation direction on the screw and therefore prohibiting implantation directions other than that which is imposed. However, depending on the anatomy of the bone or condition of the patient, it may be preferable to implant the screw in a different direction from that of the hole. In the second case, the base or plate does not rule out defective positioning of the screw in relation to the bone(s) in which it is implanted, in particular the risk of the screw emerging at a joint surface of one or more of said bones.
- It is also known to arrange a tapping in the hole and a thread on the screw head, the thread of the screw engaging with the tapping of the hole. Such assemblies also have the drawback of imposing an implantation direction on the screw determined by said engagement.
- Furthermore, such assemblies have a noteworthy risk of unscrewing of one or more screws over time under the effect of the repeated forces undergone by the bone(s). To resolve this risk of unscrewing, various axial retention systems have been designed for the screws, which, in general, have the drawbacks of being relatively expensive to manufacture and not always being very effective.
- Patent application publications nos. US 2010/312286, US 2008/208259 and US 2008/140130 illustrate various techniques of the prior art.
- The present invention aims to resolve the aforementioned drawbacks.
- The main aim of the invention is to provide an assembly as previously mentioned, in which at least one screw can be implanted in an implantation direction chosen from among several possible implantation directions, and in which the risk of unscrewing of that screw over time is reduced.
- Another aim of the invention is to provide an assembly in which the risk of defective positioning of a screw is ruled out, or preserving the possibility of choosing from among several possible implantation directions.
- In the concerned assembly, in a known manner, said implantable part comprises at least one tapped hole, and said screw comprises a head designed to be engaged in said hole.
- According to the invention,
- the hole is cylindrical and comprises at least one radial notch emerging at least in the proximal surface of said implantable part, i.e. in the surface of said implantable part through which the screw is designed to be engaged in the hole, said radial notch producing an interruption in the tapping comprised by the hole;
- the head of the screw is conical, with an apical angle comprised between 15 and 25°, and
- said head is threaded and the pitch of this thread is comprised between one third and one half the pitch of the thread making up the tapping of the hole, and the depth of the thread of that head is comprised between one half and two thirds of the depth of the pitch of the thread making up the tapping of the hole.
- The inventor took the opposite course to the fundamental teachings of mechanics, by seeking to engage and jam a screw head with a different shape from that of the hole designed to receive that screw. He was able to determine that the combination of the aforementioned features made it possible to obtain the dual advantageous result of (i) making it possible to engage the screw in a plurality of implantation directions, and (ii) producing, at the end of screwing, effective jamming of the head of the screw in the hole, of a nature to oppose any risk of unscrewing.
- The plurality of possible implantation directions of the screw results (i) from the presence of said notch, which locally interrupts the tapping of the hole and allows a slight deformation of said implantable part at that hole, (ii) the specific conical shape of the head, and (iii) the lack of narrow engagement of the respective threats of the head of the screw and hole during the first portion of the screwing phase; said effective jamming also results from (i) said possibility of slight deformation allowed by the notch, (ii) the specific conical shape of the head, which allows the respective threads of the head of the screw and the hole to gradually interlock during the second portion of the screwing phase, and which performs that complete interlocking at the end of screwing.
- Preferably, said apical angle is 20°.
- The pitch of the thread of the head of the screw is preferably in the vicinity of one half the pitch of the thread of the tapping of the hole.
- It was possible to determine these values as optimal to obtain said plurality of implantation and jamming directions of the screw. They allow a possibility of angulation of the axis of the screw in relation to the axis of the hole that may reach 20°.
- This axis of the hole may itself not be parallel to a reference plane of the implantable part, for example the general plane in which a cortical plate extends. This angulation of the hole is also added to the angulation of the screw made possible by that hole to allow a significant angulation of the screw in relation to said general plane.
- Preferably, said screw comprises a body and a bone screw thread extends along that body into the immediate vicinity of the head of said screw, below said head, such that the proximal end of said screw thread is situated, when the screw is in place on the implantable part, inside said hole.
- The presence of said screw thread in the hole contributes to achieving jamming of the screw in the hole.
- Preferably, said notch extends over the entire height of the hole.
- Said slight deformation of the implantable part at that notch is thus made completely possible.
- Preferably, the hole comprises a plurality of notches.
- According to one possibility, said notches may be present over the entire circumference of the hole, allowing an angulated orientation of the screw over the entire circumference. They may particularly be regularly distributed on that circumference.
- According to another possibility, these notches are present on a first sector of the circumference of the hole and absent on a second sector of the circumference of said hole.
- An angulated orientation of the screw is thus prohibited on the side of the hole opposite that on which said second sector is located. Due to this possibility for selective angulation of the screw, resulting from the arrangement of the notches in carefully chosen locations of the holes, an implantable part may be produced making it possible to protect against the risk of defective implantation of the screw, in particular the risk of a screw emerging at a joint surface of one or more of the treated bones.
- This possibility may in particular be implemented on a shoulder prosthesis glenoid base, to orient an anchoring screw in the pillar of the coracoid and the pillar of the shoulder blade. This possibility may also be implemented on cortical plates whereof one end is designed to be implanted near a joint surface formed by a bone, in particular on an upper humeral plate or a lower radial plate.
- The invention will be well understood, and other features and advantages thereof will appear, in reference to the appended diagrammatic drawing, showing, as non-limiting examples, several possible embodiments of the implantable part-screw assembly to which it pertains.
-
FIG. 1 is a perspective view of the plate comprising a series of holes in which anchor screws for anchoring that plate are designed to be received; -
FIG. 2 is an enlarged perspective view of one of the holes; -
FIG. 3 is a front view of the hole; -
FIG. 4 is a side view of a screw; -
FIG. 5 is an enlarged perspective view of the head of said screw; -
FIG. 6 is an enlarged side view of said head; -
FIGS. 7 to 9 are partial cross-sectional views of the plate and the screw, during three successive phases of placing the screw in the hole; -
FIG. 10 is a developed view of the hole, with a diagrammatic indication of the position of the turn of the thread of the screw according to three angulations, showing an absence of screw thread jump; -
FIG. 11 is a front cross-sectional view of part of a shoulder blade in which a base for receiving a glenoid has been implanted; -
FIG. 12 is a sagittal view of the portion of the shoulder blade, along the axis of said base; -
FIGS. 13 to 18 are front views of six possible embodiments of a hole comprised by the implantable part according to the invention; -
FIGS. 19 and 20 are sagittal and anterior views, respectively, of the upper portion of the humerus on which a plate according to the invention has been placed; -
FIG. 21 is a top view of a plate for the lower end of the radius, and -
FIGS. 22 and 23 are top and side views, respectively, of said plate, after placement on a radius. -
FIG. 1 shows anassembly 1 comprising animplantable part 2 designed to be fastened to one or more bones or bone portions to be joined, andseveral screws 3 for fastening saidimplantable part 2 to said bone(s). - For the purposes of a purely diagrammatic illustration, the
implantable part 2 has been shown inFIG. 1 as a rectangular plate with any shape whatsoever.FIGS. 11 and 12 show that this implantable part may be abase 2 for fastening a glenoid to a shoulder blade 100 or a part forming a convex joint surface called “metaglene” or “glenosphere” (not shown); this implantable part may also be a humeral cortical plate 2 (cf.FIGS. 19 and 20 ) or cortical plate for the lower end of the radius (cf.FIGS. 21 to 23 ). - The
plate 2 shown inFIG. 1 comprises a plurality of alignedholes 4, each of which is designed to receive ascrew 3. - As shown more particularly in
FIGS. 2 and 3 , eachhole 4 is cylindrical and tapped, and comprises sixnotches 5 extending radially, regularly distributed around its circumference. Thesenotches 5 extend over the entire thickness of theplate 2 and consequently interrupt the screw pitch of the tapping of thehole 4 over the entire height thereof. They are substantially U-shaped, i.e. each one forms two radial surfaces opposite one another and a rounded bottom connecting those two surfaces. - In reference to
FIGS. 4 to 6 , it appears that thescrew 3 comprises a conical and threadedhead 3 a, and abody 3 b provided with ascrew thread 3 c adapted for bearing in a bone. - The apical angle of the cone defining the
head 3 a is 20° (cf.FIG. 6 ). The pitch of the screw thread of thathead 3 a is in the vicinity of one third of the pitch of the tapping of ahole 4, and the depth of the screw thread is in the vicinity of one half that of the pitch of the tapping of ahole 4. - The
screw thread 3 d of thehead 3 a is symmetrical, has flanks that may be inclined between 45° and 75°, and has an identical depth over the entire length of the head. The screw thread may be a dual entry screw thread. - The
bone screw thread 3 c comprised by thebody 3 b of the screw extends along said body into the immediate vicinity of thehead 3 a, and is interrupted immediately below thathead 3 a. - Each
screw 3 is designed to be engaged in ahole 4 and to be screwed in the bone(s) to which theplate 2 is designed to be fastened. Thescrews 3 may be engaged in theholes 4 perpendicular to theplate 2, as shown byFIG. 1 , or maybe placed in saidholes 4 not perpendicular to theplate 2, as appears inFIGS. 7 to 9 . - This possibility for the angulation of the
screw 3, and therefore of a plurality of possible implantation directions of that screw, results (i) from the presence of thenotches 5, which locally interrupt the tapping of thehole 4 and allow a slight deformation of thepart 2 at thathole 4, (ii) the aforementioned conical shape of thehead 3 a, and (iii) the absence of narrow engagement of the respective screw threads of thehead 3 a of thescrew 3 and thehole 4 during the first part of the screwing phase, i.e. substantially at the position of thescrew 3 shown inFIG. 8 . - From this position, and in a second portion of the screwing phase going as far as the end of screwing position shown in
FIG. 9 , progressive and effective jamming of thehead 3 a occurs in thehole 4, of a nature to oppose any risk of unscrewing of thescrew 3. This jamming results from (i) said possibility of slight deformation allowed by thenotches 5, and (ii) the aforementioned conical shape of thehead 3 a, which allows the gradual interlocking of the respective threads of thehead 3 a and thehole 4 during said second portion of the screwing phase, and which performs the complete interlocking at the end of screwing. - It will also be understood in reference to
FIG. 9 that the portion of the first turn of thebone screw thread 3 c can be located, in that end-of-screwing position, inside thehole 4, thus contributing to the jamming of thescrew 3 in saidhole 4. -
FIG. 10 shows the development of thehole 4 with threelines screw thread 3 d of thehead 3 a, for respective angulations of thescrew 3 of 0°, 6° and 12°. It shows that there is no screw thread jump. - In reference to
FIGS. 11 and 12 , it appears that theaforementioned base 2 comprises acentral anchor lug 15 and fourholes 4 distributed around saidlug 15, designed to receive screws 3 (only two of the fourscrews 4 are placed on the illustratedbase 2, for which placement is in progress). - It appears that the axes of the
holes 4 are not parallel to the axis of thelug 15, but rather inclined in relation to the axis, by 10° in the illustrated example. This angulation of theholes 4 is thus added to the angulation of thescrews 3 made possible by those holes, so as to allow a significant angulation of thescrews 3 in relation to a reference plane perpendicular to the axis of thelug 15. In the illustrated example, the total angulation of thelower screw 3 is 20° (10° angulation of thehole 4 in relation to said axis, and 10° angulation of thescrew 3 in the hole 4). Owing to this possibility of significant angulation, theupper screw 3 and thelower screw 3 can be oriented optimally for anchoring respectively in thepillar 101 of the coracoid and thepillar 102 of the shoulder blade. -
FIGS. 13 to 16 show holes 4 having shapes and numbers ofnotches 5 different from those described above. Thehole 4 shown inFIG. 13 comprises notches identical to those described above, but comprises eight instead of six. Thehole 4 shown inFIG. 14 comprises only fournotches 5, also U-shaped, but much wider than those described above. Thehole 4 shown inFIG. 15 comprises sixnotches 5 with a half-circle section. Thehole 4 shown inFIG. 16 comprises eightsuch notches 5 with a half-circle section. - The
hole 4 shown inFIG. 17 comprises fivenotches 5 regularly arranged on a first sector in the vicinity of 240° and is provided without notches on a second sector in the vicinity of 120°. Similarly, thehole 4 shown inFIG. 18 comprises fournotches 5 regularly arranged on the first sector in the vicinity of 180° and is provided without notches on the second sector in the vicinity of 180°. The absence ofnotches 5 on said second sectors amounts to a rigidity of theimplantable part 2 and continuity of the screw thread of the tapping of thehole 4 at said second sectors, which results in an impossibility of orienting thescrew 3 on the sides of theholes 4 opposite those on which said second sectors are located. -
Implantable parts 2 may thus be designed whereof the risk of defective implantation of ascrew 3 is eliminated. - Thus, in reference to
FIG. 19 , it appears that ahumeral plate 2 may comprise, in the epiphyseal portion thereof, two side-by-side holes 4 whereof the sectors facing the side opposite the epiphyseal end of saidplate 2 are provided without notches. Then, an excessive orientation of thescrews 3 toward the epiphyseal cortical bone of thehumeral head 103 is prevented, as shown inFIG. 20 , which avoids the risk of saidscrews 3 emerging on the joint surface of the humerus. Thethird hole 4 comprised by said epiphyseal portion also has a sector provided without notches on the side of that hole opposite the epiphyseal end of theplate 2; said sector thus prevents the orientation of thescrew 3 engaged in that hole toward the humeral diaphysis. However, the possibility remains of choosing the implantation direction of thescrews 3 in the other directions mentioned above. -
FIG. 21 shows aplate 2 for a lower end of the radius, traditionally having a wideneddistal portion 2 a. In thatdistal portion 2 a, aproximal series 21 of fourholes 4 and adistal series 22 of threeholes 4 are arranged transversely. Theholes 4 of theproximal series 21 each comprise six notches as described above, allowing a multidirectional orientation of thescrews 3. Eachhole 4 of thedistal series 22 comprises a first sector having fournotches 5, turned toward the distal end of theplate 2, and a second sector provided without notches, situated on the side of thehole 4 turned toward the side of saidproximal series 21. - As will be understood in reference to
FIGS. 22 and 23 , thescrews 3 engaged in theholes 4 of thedistal series 22 may not be oriented toward the distal end of theradius 104, which prevents any risk of saidscrews 3 emerging at the joint surfaces comprised by saidradius 104. - It appears from the preceding that the invention provides an
assembly 1 including animplantable part 2 and at least onescrew 3, having the decisive advantages of making it possible to engage thescrew 3 in ahole 4 of thepart 2 in a plurality of implantation directions, and of achieving, at the end of screwing, effective jamming of thehead 3 a of the screw in thehole 4, of a nature to oppose any risk of unscrewing. Another decisive advantage of thisassembly 1 is making it possible to eliminate the risk of defective positioning of thescrew 3. - The
assembly 1 according to the invention can be used on all anatomies other than those previously mentioned, such as femur, tibia, elbow or foot, and works irrespective of the material used, for example stainless steel or titanium. - The invention was described above in reference to embodiments provided as examples. It is of course not limited to these embodiments, but on the contrary encompasses all other embodiments covered by the appended claims. In particular, the
base 2 shown inFIGS. 11 and 12 can comprise middle holes 4 (i.e. the twoholes 4 other than the upper hole and the lower hole visible inFIG. 12 ) provided withoutnotches 5 on the sectors thereof turned toward the outside of thebase 2, thereby prohibiting the screws from being oriented in implantation directions that risk causing those screws to emerge outside the bone.
Claims (14)
1. An assembly comprising:
an implantable part designed to be fastened to at least one bone or bone portions to be joined, and
at least one screw for fastening the implantable part to the at least one bone or bone portions, said implantable part includes at least one tapped hole, and said screw includes a head designed to be engaged in said tapped hole;
wherein:
the tapped hole is cylindrical and includes at least one radial notch emerging in a surface of said implantable part through which the screw is designed to be engaged in the tapped hole,;
said radial notch produces an interruption in the tapping comprised by the tapped hole;
the head of the screw is conical, with an apical angle comprised between 15 and 25°, and
the head is threaded and the pitch of the thread includes between one third and one half the pitch of the thread making up the tapping of the tapped hole, and the depth of the thread of the head includes between one half and two thirds of the depth of the pitch of the thread making up the tapping of the tapped hole.
2. The assembly according to claim 1 , wherein said apical angle is 20°.
3. The assembly according to claim 1 , wherein the pitch of the thread of the head of the screw is in the vicinity of one half the pitch of the thread of the tapping of the tapped hole.
4. The assembly according to claim 1 , wherein said screw comprises a body and a bone screw thread extends along that body into the immediate vicinity of said head of said screw, below said head, such that the proximal end of said screw thread is situated, when the screw is in place on the implantable part, inside said tapped hole.
5. The assembly according to claim 1 , wherein said notch extends over the entire height of said tapped hole.
6. The assembly according to claim 1 , wherein said tapped hole comprises a plurality of said notches.
7. The assembly according to claim 6 , wherein said notches are present over the entire circumference of said tapped hole, allowing an angulated orientation of said screw over the entire circumference.
8. The assembly according to claim 6 , wherein said notches are regularly distributed on that circumference.
9. The assembly according to claim 6 , wherein said notches are present on a first sector of the circumference of the tapped hole and absent on a second sector of the circumference of said tapped hole.
10. The assembly according to claim 1 , wherein said implantable part is a fastening base for fastening part of a joint prosthesis to a bone.
11. The assembly according to claim 10 , wherein said implantable part is a fastening base for fastening a glenoid to shoulder blade in a total shoulder prosthesis.
12. The assembly according to claim 1 , wherein said implantable part is a cortical plate.
13. The assembly according to claim 12 , wherein said implantable part is a superior humeral cortical plate.
14. The assembly according to claim 12 , wherein said implantable part is an inferior radius cortical plate.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/604,798 US20140066998A1 (en) | 2012-09-06 | 2012-09-06 | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
US14/812,169 US9782208B2 (en) | 2012-09-06 | 2015-07-29 | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
Applications Claiming Priority (1)
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US14/812,169 Continuation US9782208B2 (en) | 2012-09-06 | 2015-07-29 | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
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US14/812,169 Active US9782208B2 (en) | 2012-09-06 | 2015-07-29 | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
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Application Number | Title | Priority Date | Filing Date |
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US14/812,169 Active US9782208B2 (en) | 2012-09-06 | 2015-07-29 | Assembly comprising an implantable part designed to be fastened to one or more bones or bone portions to be joined, and at least one screw for fastening the implantable part to said bone(s) |
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