EP3927263A1 - Implant consisting of bioresorbable material, and method for producing same - Google Patents
Implant consisting of bioresorbable material, and method for producing sameInfo
- Publication number
- EP3927263A1 EP3927263A1 EP20706474.2A EP20706474A EP3927263A1 EP 3927263 A1 EP3927263 A1 EP 3927263A1 EP 20706474 A EP20706474 A EP 20706474A EP 3927263 A1 EP3927263 A1 EP 3927263A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- implant
- channel
- thread
- cross
- designed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000007943 implant Substances 0.000 title claims abstract description 150
- 239000000463 material Substances 0.000 title claims description 16
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 20
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 13
- 239000011777 magnesium Substances 0.000 claims abstract description 13
- 239000011265 semifinished product Substances 0.000 claims description 18
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000576 coating method Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 12
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000001125 extrusion Methods 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 6
- 210000000988 bone and bone Anatomy 0.000 claims description 5
- 230000001054 cortical effect Effects 0.000 claims description 4
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 4
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 4
- 239000003814 drug Substances 0.000 claims description 3
- 229940079593 drug Drugs 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 6
- 239000011295 pitch Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- 238000005553 drilling Methods 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000003204 osmotic effect Effects 0.000 description 4
- 238000010079 rubber tapping Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 229910052727 yttrium Inorganic materials 0.000 description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 150000004676 glycans Chemical class 0.000 description 2
- 229920001282 polysaccharide Polymers 0.000 description 2
- 239000005017 polysaccharide Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 210000004872 soft tissue Anatomy 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000007857 degradation product Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 210000003041 ligament Anatomy 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 230000000451 tissue damage Effects 0.000 description 1
- 231100000827 tissue damage Toxicity 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- 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
- A61B17/864—Pins or screws or threaded wires; nuts therefor hollow, e.g. with socket or cannulated
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0401—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors
-
- 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
- A61B17/866—Material or manufacture
-
- 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
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
- A61B17/8875—Screwdrivers, spanners or wrenches
- A61B17/8877—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit
- A61B17/888—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit the driver bit acting on 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
- A61B17/863—Shanks, i.e. parts contacting bone tissue with thread interrupted or changing its form along shank, other than constant taper
-
- 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
- A61B17/8645—Headless screws, e.g. ligament interference screws
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/0046—Surgical instruments, devices or methods, e.g. tourniquets with a releasable handle; with handle and operating part separable
- A61B2017/00473—Distal part, e.g. tip or head
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00477—Coupling
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00526—Methods of manufacturing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0401—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors
- A61B2017/0409—Instruments for applying suture anchors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0401—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors
- A61B2017/0414—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors having a suture-receiving opening, e.g. lateral opening
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/04—Surgical instruments, devices or methods, e.g. tourniquets for suturing wounds; Holders or packages for needles or suture materials
- A61B17/0401—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors
- A61B2017/044—Suture anchors, buttons or pledgets, i.e. means for attaching sutures to bone, cartilage or soft tissue; Instruments for applying or removing suture anchors with a threaded shaft, e.g. screws
Definitions
- Implant made from a bioabsorbable material as well
- the invention relates to an implant from a
- the invention relates to implants with a thread, such as, for example, bone screws, in particular for fixing bone fragments and / or for fixing ligaments, as well as anchor systems, such as, for example, suture anchors.
- the implant includes
- the invention also relates to a
- the invention also relates to a set with an implant made of a bioabsorbable material and an implant
- Implants especially screws made of bioabsorbable material, are widely used in practice
- bioabsorbable plastic implants The disadvantage of bioabsorbable plastic implants is the low mechanical strength of the material.
- Bone screws made from a magnesium alloy comprise a head with a drive which is designed, for example, as a hexalobular socket.
- Magnesium alloys still have a significantly lower strength than conventionally used titanium or
- Screwing in the implant is damaged. Another problem, which is well known from practice, is the formation of hydrogen when the implant is broken down.
- Gas bubble formation can interfere with the healing process
- the aim is therefore to make such implants from as little material as possible.
- Hollow structures for example in the case of a screw, in particular a porous design of the material, are in turn associated with such a reduced strength that the screw may break when it is screwed in within the thread area.
- the invention is based on the object of providing an implant or a method for its production as well as a semi-finished product for an implant and a set with a
- the object of the invention is already achieved by an implant made of a bioresorbable material, by a method for its production, by a semi-finished product for production of an implant as well as a set with an implant according to one of the independent claims.
- the invention relates to an implant from a
- the invention relates to an implant made of magnesium or a magnesium alloy.
- Magnesium alloy which comprises 0.5 to 10% by weight of yttrium.
- the implant according to the invention from a plastic, in particular from a polymer such as a polylactate or a polysaccharide.
- the implant has a channel which extends from a rear end to a front end and which is a form-fit element for a
- Handling tool forms.
- the channel therefore has a non-circular cross section, so that a torque can be exerted on the implant via a handling tool.
- the invention is therefore based on the effect that by providing a continuous channel, the entire length of the implant can be used for torque transmission.
- the channel reduces the weight of the implant, which, if the implant is made from magnesium or a magnesium alloy, reduces the formation of gas when the implant is broken down.
- the handling tool stabilizes the implant when it is screwed in, so that despite the implant being lighter than an implant without a channel, the risk of breaking during screwing is reduced.
- the channel preferably has a uniform cross section at least in the area of a thread, particularly preferably over its entire length.
- the channel is preferably concentric to the
- the channel is preferably open at the front, that is to say at the tip of the implant.
- a continuous channel which ends at a tip which is designed, for example, as a drill with cutting edges.
- the continuous channel extends as a blind hole to the tip and extends in particular along a thread of the implant.
- a channel that is open at the front has the particular advantage that such an implant can be manufactured efficiently from an extruded magnesium alloy in which the channel serving as a form-fit element was introduced during the extrusion process.
- the channel is cross-shaped.
- the channel seen in cross section, consists of two
- the implant comprises a coating.
- the implant comprises a magnesium fluoride coating.
- a magnesium fluoride coating Such a layer can be created in a simple manner by immersing the implant in hydrofluoric acid
- the implant can, in particular, prevent corrosion immediately after the insertion of the implant
- the implant is provided with a combination of magnesium fluoride coating and
- Adhesion promoter layer Adhesion promoter layer.
- the coating in particular the polymer coating, preferably has a thickness of less than 5 gm, preferably less than 1 gm, in particular a thickness of 0.2 to 0.8 gm.
- Such a thin coating minimizes the risk of cracking of the layer on insertion.
- the wall of the implant comprises passages to the channel.
- the channel is on the side of at least one
- Passages are compensated in an improved manner.
- the passages are designed as intersections of the channel with the tooth base of a thread.
- the passages can be provided in a very simple manner by providing a semi-finished product with the channel with the thread.
- the tooth base of the thread overlaps with the channel so that passages are created in the tooth base.
- Cross-shaped channel four passages, each 90 ° distributed, are formed in each thread turn.
- the implant preferably has a length of 6 to 20 mm and / or a diameter of 2 to 5 mm.
- the implant has a self-tapping tip.
- a self-tapping tip can also be provided in the case of an implant with a channel that is open at the front by at least one bevel of the first front thread turn.
- the implant can furthermore comprise a conical head.
- the invention relates in particular to a screw with a conical head, the thread merging into the head without a transition, that is to say without a step.
- the head is preferably also provided with a head thread.
- the thread preferably goes seamlessly into the Head thread over by at least one thread from the
- Thread to head thread continues.
- the thread of the implant has a greater pitch than the head thread.
- This embodiment of the invention is intended in particular for a cortex screw. At the end of the screwing-in process, the screw jams due to the different thread pitches, especially on the head.
- the implant can consist of a magnesium alloy with a tensile strength Rm (according to DIN EN ISO 6892-1, version 2017-02) of over 250 MPa, in particular over 350 MPa, and / or below 500 MPa, in particular below 450 MPa.
- Rm tensile strength
- the implant according to the invention is preferably as
- Screw especially designed as a cortical screw, as a pin, as a wedge or as a suture anchor.
- a suture anchor is in particular also designed as a screw, a fastening element, in particular in the form of a wire or thread, being held by the suture anchor.
- the wire or thread can in particular be passed through an eyelet which is preferably present in the front region of the implant.
- the invention also relates to a method for
- a semi-finished product is by means of a
- Extrusion process made from a rod made of magnesium or a magnesium alloy, with the channel of the implant in the semi-finished product during the extrusion
- a rod in particular made of a magnesium alloy, can be pressed onto a shape in an extrusion machine in a simple manner, which defines the shape of the channel.
- the pressure liquefies the metal, so that it can pass the holding bars of the mold and then reassembles after the mold.
- the semifinished product produced in this way and provided with a channel, in particular with a central inner cross, can then be further processed into the final shape, for example by means of a machining
- the invention also relates to a semi-finished product for
- the semi-finished product consists of a rod made of magnesium or magnesium alloy with a channel designed as a form-fit element for a hand tool.
- the channel is designed in particular as a cross
- the inner and / or outer edges of the cross are preferably rounded. This can reduce the risk of cracks on edges. At the same time, the
- Rounding facilitates the introduction of the handling tool.
- the cross preferably has a height and / or a width of 20-60%, preferably 30-45% and / or rounded edges with an edge radius of 5-40%, preferably 10-30% of the outer diameter of the thread of the implant .
- Stabilization by the drive can be achieved with little material volume at the same time.
- the cross (not only of the semi-finished product, but also of the
- Implant preferably has a height and / or width of 1.3 to 2.5 mm, particularly preferably 1.5 to 2.1 mm, in cross section.
- the rounded edges preferably have one
- Edge radius from 0.1 to 0.8 mm, particularly preferably from 0.2 to 0.6 mm.
- the invention also relates to a set with the
- the handling tool is in particular as
- Screwdriver designed with a handle.
- the handling tool comprises a shaft which is adapted to the channel designed as a form-fit element.
- the shaft has the same shape as the channel.
- the shaft and channel are preferably matched to one another in such a way that the implant can be pushed onto the handling tool in a clamping manner, so that it is secured against accidental falling when it is inserted.
- the shaft of the handling tool extends
- the tip of the shaft is designed as a drill.
- This embodiment thus relates to implants with a channel that is open at the front, the shaft protruding from the implant at the front with a section that is sharpened, for example, for drilling.
- the handling tool can thus be used at the same time for pre-drilling or expanding a pre-drilling that has already been made.
- the shaft of the handling tool can have a coupling.
- the handling tool can, in particular, be manually or motor-driven
- the coupling is preferably designed as a quick coupling, that is to say as a coupling that can be actuated without tools.
- Couplings are primarily used in medical,
- the handling tool can be designed, for example, as a bit that can be inserted into an instrument.
- the implant can also be designed as a suture anchor, the suture in the channel with a
- Locking element can be fastened.
- the locking element is designed as an additional stopper.
- the stopper can at least partially have a higher hardness than the channel.
- the implant can be used as an absorbable port to the medullary canal of the bone.
- the implant can be used for repeatedly usable access through which, for example, medication is introduced and / or
- Degradation products such as Gases can be discharged.
- the implant can be used as a temporary reservoir e.g. especially for drugs.
- the implant can comprise at least one closed or at least closable chamber in which e.g. an active ingredient can be arranged.
- FIGS. 1 to 9 The subject matter of the invention is intended below with reference to the drawings, FIGS. 1 to 9, using a
- FIG. 1 is a side view of an implant designed as a cortical screw.
- Fig. 2 is an axial sectional view.
- Figure 3 is a rear plan view of the implant.
- Figure 6 is a perspective view of the implant.
- Fig. 7 shows in a schematic perspective
- FIG. 8 is a schematic view of the nozzle of a
- Extrusion machine such as those used to manufacture a
- implant according to the invention can be used.
- Fig. 9 shows an alternative embodiment of a
- Handling tool which is designed as an insert for a handpiece.
- Fig. 1 shows in a side view an embodiment of an implant 1 according to the invention, which as
- the implant 1 comprises a thread 2, which in this embodiment extends over the entire length of the implant
- Implant 1 extends.
- the flattened section which is formed by the tooth tips 4 can in particular have a length of 0.3 to 2 mm.
- the thread 2 goes seamlessly, i.e. without a step, into an otherwise conical, in particular frustoconical,
- Head threads 5 are formed as a single unit in this exemplary embodiment.
- the thread 2 has a larger pitch than that
- the pitch of the thread 2 is 5 to 20%, particularly preferably 8 to 15%, greater than the pitch of the head thread 5.
- the pitch of the thread 2 is preferably 2 to 5 mm.
- the implant 1 preferably has a length of 6 to
- the length of the head 8 is preferably 1/2 to 1/10 of the total length of the implant 1, particularly preferably 1/4 to 2/5.
- the diameter of the implant 1 in the area of the thread 2 is preferably 2 to 5 mm, particularly preferably 2.5 to 3.5 mm.
- the implant 1 has a tip 7 with a channel 10 that is open at the front.
- the channel 10 partially overlaps with the tooth base 3 of the thread 2.
- the passages 9 allow pressure equalization both with regard to gases and with regard to osmotic pressures.
- the tip 7 of the implant 1 is self-tapping
- the tooth base 3 is rounded, in particular with a radius of 0.5 to 1 mm.
- the tooth depth is preferably 0.5 to 0.8 mm.
- FIG. 2 shows the implant 1 shown in FIG. 1 in an axial sectional view.
- the channel 10 can be seen, which extends from the rear end of the implant to the front end of the implant 1.
- the channel is cross-shaped
- the cross-shaped configuration of the channel 10 can be seen in particular.
- the channel 10 preferably has a height h (corresponds to the width) of 1.3 to 2.5 mm, particularly preferably 1.5 to 2.1 mm.
- the height h or the width of the channel 10 and / or its largest diameter is preferably at least 20%, preferably at least 40%, of the outer diameter of the thread through which the channel extends.
- the channel 10 seen in cross section, consists of two identical rectangles rotated by 90 ° to one another
- Both the outer edges 11 and the inner edges 12 are preferably rounded.
- Inner edges r a can in particular be 0.5 to 1 mm.
- the height h of the channel is preferably 2 to
- This configuration enables easy insertion of the handling tool (see FIG. 6).
- the handling tool stabilizes the entire implant 1 when it is screwed in and the
- Torque transmission is distributed over the entire channel 10.
- Implant 1 significantly reduced. As a result, less bioresorbable material, in particular less magnesium, has to be broken down, which affects both gas formation and that which occurs due to the formation of metal salts
- the channel 10 runs continuously from the rear to the front.
- tooth tip 4 of the first thread in this embodiment has two opposing polished surfaces 6, which one
- FIG. 5 shows the contour of the enveloping the thread
- the head 8 which is provided with a head thread, is conical.
- the diameter of the implant 1 in the area of the thread d s is preferably 2 to 5 mm.
- conical, in particular frustoconical head 8 d k is preferably 20 to 40%, particularly preferably 25 to 35%, larger than the outer diameter of the thread d s .
- the rear corner 14 of the implant is preferred
- the conical head preferably has an acute angle ⁇ of 90 to 150 °, particularly preferably from 110 to 130 °.
- the implant is preferably designed to taper to a point at the tip 7.
- the point angle is
- Fig. 6 is a perspective view of the foregoing
- implant 1 It can be clearly seen that the bevel 6 is designed as a cut-out segment of the implant 1. The bevel 6 extends over the first thread turn of the thread 6 and then runs out.
- the bevel 6 is designed in particular as a piece of cake-like angled incision, which extends to the rear
- the surface 6, which is formed by the bevel, is preferably formed with a radially extending surface essentially pointing towards the central axis 25.
- the adjacent axially extending surface 26 formed by the bevel preferably closes with a
- the surface of the bevel forms an angle of 50 ° to 120 °, in particular an angle of 90 °.
- the bevel can be formed with a cylindrical milling cutter, in which it removes a right-angled segment starting from the tip, which ends after the tooth tip of the first thread turn.
- FIG. 7 shows, in a perspective illustration, a schematically illustrated handling tool 15 for the previously illustrated implant.
- the handling tool 15 is a screwdriver
- the shaft 16 is cross-shaped.
- the shape of the shaft 16 corresponds (except for tolerances) to the shape of the
- the shaft 16 is designed as a drill and is used for pre-drilling in the region of the channel of the implant.
- the shaft 16 is adjoined by a thicker shaft 18 which forms a stop 19 for the placed implant.
- the implant can be placed on the shaft 16 in a simple manner and screwed in using the handling tool 15.
- the handling tool 15 can simply be pulled out.
- the handling tool can also include, for example, an exchangeable bit which is used to hold the implant.
- Fig. 8 is a schematic view of the nozzle 21 of an extrusion machine as used for the manufacture of a
- implant according to the invention can be used.
- the nozzle 21 comprises an insert 22 which is connected to the wall of the nozzle 21 by means of at least one web 23.
- the shape of the insert 21 corresponds to the channel of the
- Implant A rod (not shown) from a
- Magnesium alloy is extruded through the nozzle 21.
- the material liquefies in the area of the insert through appropriate pressure and / or temperature control adapted to the melting temperature of the alloy, so that it flows around the at least one web 23.
- the semi-finished product produced in this way (not shown) can then be used to produce the implant, e.g. by first machining the in Fig. 5
- Fig. 9 shows in a side view and in a
- FIG. 24 Top view of the tip of a further exemplary embodiment of a handling tool 24, which is designed as an insert for a medical instrument, in particular a motor-operated instrument (not shown).
- This embodiment also comprises a cross-shaped shaft 16 with a tip 17 which is used to drive the implant 1.
- the stop 19 is provided in that the cross-shaped shaft 16 in the area of the stop 19 to a different cross section, in particular to a
- the transition does not run perpendicular, but rather obliquely to the central axis. Due to the surfaces thus formed at an angle to the central axis 27, the implant is clamped in the region of the stop 19 and is thus secured against unintentional loosening after it has been placed on.
- the handling tool can be inserted into a medical instrument.
- the invention made it possible to provide a bioresorbable implant in a very simple manner, which can be screwed in more easily and securely, as well as in which the weight of the implant can be minimized, which in particular reduces gas pressures and osmotic pressures that arise in implants made of magnesium and magnesium alloys.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019104546.0A DE102019104546A1 (en) | 2019-02-22 | 2019-02-22 | Implant made from a bioresorbable material and method for its production |
PCT/EP2020/054482 WO2020169734A1 (en) | 2019-02-22 | 2020-02-20 | Implant consisting of bioresorbable material, and method for producing same |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3927263A1 true EP3927263A1 (en) | 2021-12-29 |
Family
ID=69645988
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20706474.2A Pending EP3927263A1 (en) | 2019-02-22 | 2020-02-20 | Implant consisting of bioresorbable material, and method for producing same |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3927263A1 (en) |
DE (1) | DE102019104546A1 (en) |
WO (1) | WO2020169734A1 (en) |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2062012C (en) * | 1991-03-05 | 2003-04-29 | Randall D. Ross | Bioabsorbable interference bone fixation screw |
AU689846B2 (en) * | 1994-03-29 | 1998-04-09 | Zimmer Gmbh | Screw made of biodegradable material for bone surgery purposes, and screwdriver suitable therefor |
US6387129B2 (en) * | 1998-03-18 | 2002-05-14 | Arthrex, Inc. | Bicortical tibial fixation of ACL grafts |
US6283973B1 (en) * | 1998-12-30 | 2001-09-04 | Depuy Orthopaedics, Inc. | Strength fixation device |
FR2803739B1 (en) * | 2000-01-13 | 2002-02-15 | Denis Bertin | THREADED IMPLANT FOR MEDICAL USE |
US6663656B2 (en) * | 2001-02-26 | 2003-12-16 | Arthrex, Inc. | Torque driver for interference screw |
US6921402B2 (en) * | 2001-12-27 | 2005-07-26 | Ethicon, Inc. | Polymer-based orthopedic screw and driver system with increased insertion torque tolerance and associated method for making and using same |
US8016865B2 (en) * | 2003-09-29 | 2011-09-13 | Depuy Mitek, Inc. | Method of performing anterior cruciate ligament reconstruction using biodegradable interference screw |
US8535357B2 (en) * | 2004-12-09 | 2013-09-17 | Biomet Sports Medicine, Llc | Continuous phase compositions for ACL repair |
FR2879915B1 (en) * | 2004-12-24 | 2008-02-15 | Advanced Biomaterials Soc Par | INTERFERENCE SCREW AND ADJUSTABLE SCREWDRIVER |
US8092528B2 (en) * | 2005-05-27 | 2012-01-10 | Depuy Spine, Inc. | Intervertebral ligament having a helical bone fastener |
US8608802B2 (en) * | 2009-11-20 | 2013-12-17 | Zimmer Knee Creations, Inc. | Implantable devices for subchondral treatment of joint pain |
CN105263440A (en) * | 2013-04-09 | 2016-01-20 | 史密夫和内修有限公司 | Open-architecture interference screw |
US9757257B2 (en) * | 2013-04-26 | 2017-09-12 | Mirus Llc | Metal alloys for medical devices |
CN103263697A (en) * | 2013-06-08 | 2013-08-28 | 吉林金源北方科技发展有限公司 | All-biological controllable and degradable bone nail and using method thereof |
US10154865B2 (en) * | 2015-03-24 | 2018-12-18 | Biotronik Ag | Orthopedic implants, particularly bone screws, and methods for producing same |
-
2019
- 2019-02-22 DE DE102019104546.0A patent/DE102019104546A1/en active Pending
-
2020
- 2020-02-20 WO PCT/EP2020/054482 patent/WO2020169734A1/en unknown
- 2020-02-20 EP EP20706474.2A patent/EP3927263A1/en active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2020169734A1 (en) | 2020-08-27 |
DE102019104546A1 (en) | 2020-08-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP0053999B1 (en) | Osteosynthetic device and drilling jig therefor | |
DE19831336C2 (en) | Bone screw, especially for use with translaminar vertebrae | |
CH688222A5 (en) | Bone fixation element. | |
WO2004086990A1 (en) | Housing for a locking element and locking element | |
WO2007048267A1 (en) | Thread-forming screw | |
DE102004009429A1 (en) | Bone anchoring element | |
CH666176A5 (en) | DEVICE FOR TREATING A BONE AND NAIL FOR SUCH A DEVICE. | |
EP1547535B1 (en) | Self-drilling bone screw | |
WO2015091916A1 (en) | Self-tapping, tension absorbing bone screw | |
WO2020169734A1 (en) | Implant consisting of bioresorbable material, and method for producing same | |
DE2542263A1 (en) | Osteo synthetic pin for bone fractures - has slotted ends which are expanded by screwed spindle | |
EP3927264B1 (en) | Corticalis screw consisting of bioresorbable material | |
EP4231946A1 (en) | Screw element optimized for 3d printing | |
EP3019102B1 (en) | Bone screw | |
EP0263938B1 (en) | Pulling nail for osteosynthesis | |
DE202013105409U1 (en) | Screw in particular bone screw and a tool for this | |
EP3013265B1 (en) | Out-of-round pedicle screw | |
WO1996041573A1 (en) | Self-drilling bone securing component | |
DE102021000210A1 (en) | Screw element and method for additive manufacturing | |
DE102013113135A1 (en) | Screw in particular bone screw and a tool for this | |
DE102014226493B4 (en) | Connecting element for fixing at least two bones or bone fragments of a living being | |
WO2023030721A1 (en) | Medical fixing system | |
AT507501B1 (en) | BONE SCREW | |
DE202007019576U1 (en) | Femoral head implant | |
DE102005037172A1 (en) | Screw for fixing fractured femoral neck, comprises complementary clip held in longitudinal grooves |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20210712 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230525 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20240301 |