DK168468B1 - Transcutaneous pin, and preparation thereof, for attaching a bone portion or fragment. - Google Patents
Transcutaneous pin, and preparation thereof, for attaching a bone portion or fragment. Download PDFInfo
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- DK168468B1 DK168468B1 DK574686A DK574686A DK168468B1 DK 168468 B1 DK168468 B1 DK 168468B1 DK 574686 A DK574686 A DK 574686A DK 574686 A DK574686 A DK 574686A DK 168468 B1 DK168468 B1 DK 168468B1
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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
- A61B17/84—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
- A61B17/8635—Tips of screws
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Description
i DK 168468 B1in DK 168468 B1
Den foreliggende opfindelse angår en transkutan tap til fastgørelse af en knoglepart eller fragment omfattende en gevindforsynet del, hvor den forreste del af gevindet, som er tilvejebragt i form af en trunke-ret førende konus og i det mindste en spånrille, som definerer en skæ-5 rende kant, der forløber over nævnte trunkerede konus, og over begyndelsen af gevindets centrale cylindriske del for at udføre en gevindskæringsoperation, når enden af den gevindforsynede del trænger ind i knogleparten eller fragmentet.The present invention relates to a transcutaneous pin for attaching a bone portion or fragment comprising a threaded portion, the forward portion of the thread provided in the form of a truncated guide cone and at least a chip groove defining a cutting edge. 5, extending over said truncated cone and over the beginning of the central cylindrical portion of the thread to perform a thread cutting operation as the end of the threaded portion penetrates the bone portion or fragment.
20 Transkutane tappe har været kendt i mange år og anvendes indenfor knoglekirurgi, navnlig ved ydre osteosyntese. Sådanne tappe passerer gennem kødet og knoglen og anvendes almindeligvis sammen med den type ydre skeletfikseringsinstrumenter, som er udviklet af Dr. Hoffmann. Disse ydre skeletfikseringsinstrumenter omfatter hvirvelled, forbin-25 delsesstænger, gi idestænger, ledforbindelser og forankringsspændestyk-ker, der er beregnet til at fastholde og positionere de transkutane tappe. Hoffmann's ydre fikseringsindretninger omfatter en samlet ramme, som anbringes omkring en del af det menneskelige legeme eller et organ og arrangeres for at fastholde knogler eller knoglefragmenter på 2Q plads fra det ydre ved hjælp af tappe eller grupper af transkutane tappe.20 Transcutaneous pins have been known for many years and are used in bone surgery, especially in external osteosynthesis. Such pins pass through the flesh and bone and are commonly used with the type of outer skeletal fixation instruments developed by Dr. Hoffmann. These outer skeletal fixing instruments comprise vertebral joints, connecting rods, idle rods, articulated joints, and anchoring clamps intended to hold and position the transcutaneous pins. Hoffmann's external fixing devices comprise an assembled frame which is arranged around a portion of the human body or organ and arranged to hold bones or bone fragments in 2Q space from the exterior by pins or groups of transcutaneous pins.
Der er idag mange typer af transkutane tappe på markedet. Disse tappe omfatter almindeligvis en gevindforsynet del med en gevindskæringsdel 25 ved enden arrangeret for at skære et gevind, når den skrues ind i en knoglepart eller et fragment. Før tappen monteres, bores der i knoglen eller knoglefragmentet først et hul med ønsket diameter, som stort set er identisk med eller større end inderdiameteren for gevindet. Tappens ende indføres derefter i det borede hul, og den gevindforsynede del af 30 tappen skrues ind i hullet. Under denne operation vil snittappen, som er tilvejebragt ved enden af tappen, skære gevindet i det på forhånd borede hul. For at skrue tappen ind i hullet anvendes der almindeligvis en borepatron eller klo, som går i indgreb med en del af et polygonalt tværsnit, for eksempel et kvadratisk tværsnit, som er anbragt ved den ene ende af tappen. I de kendte tappe kan den gevindforsynede ende være udformet ligesom spidsen af et boreskær, eller den kan antage forskellige konfigurationer, som er velkendte for en fagmand på området.There are many types of transcutaneous pins on the market today. These pins generally comprise a threaded portion with a threaded portion 25 arranged at the end to cut a thread as it is screwed into a bone portion or fragment. Before mounting the pin, a hole of the desired diameter is drilled into the bone or bone fragment which is substantially identical to or larger than the inner diameter of the thread. The end of the pin is then inserted into the drilled hole and the threaded portion of the pin is screwed into the hole. During this operation, the cut pin provided at the end of the pin will cut the thread in the pre-drilled hole. In order to screw the pin into the hole, a drill cartridge or claw is generally used which engages a portion of a polygonal cross-section, for example a square cross-section disposed at one end of the pin. In the prior art pins, the threaded end may be shaped like the tip of a drill bit, or it may assume various configurations well known to one skilled in the art.
35 DK 168468 Bl 2DK 168468 Bl 2
Der findes ligeledes tappe, der kaldes for transfikserende tappe, ved hvilke der foran den gevindforsynede del er tilvejebragt en stang med en borespids ved den frie ende. Transfikserende tappe kan monteres uden, at der på forhånd er boret et hul i knoglen. Med den transfikse-5 rende tap bores hullet ved hjælp af enden af spidsen og gevindet ved hjælp af en gevindskæringsdel, der er tilvejebragt ved begyndelsen af gevindet. Transkutane og transfikserende tappe af den ovenfor beskrevet type er beskrevet i US-A-4.537.185, US-A-2.388.482 og FR-A-2.517.535.There are also pins called transfixing pins in which a rod with a drill tip is provided at the free end in front of the threaded portion. Transfixing pins can be mounted without a hole in the bone beforehand. With the transfixing pin, the hole is drilled by the end of the tip and the thread by means of a thread-cutting member provided at the beginning of the thread. Transcutaneous and transfixing pins of the type described above are described in US-A-4,537,185, US-A-2,388,482 and FR-A-2,517,535.
1010
Kendte transkutane tappe vil ikke tilvejebringe en boring eller gevindskæring med særlig god kvalitet. Således som det er tilfældet ved enhver bore- eller gevindskæringsoperation, stiger temperaturen ved det sted, hvor operationen foregår, hvilket kan forårsage nekroser og 15 nedbrydninger i knoglevævet. Desuden vil kendte tappe ikke frembringe gevindskårne overflader af god kvalitet. Overfladerne er visse steder revet ud, og der vil således ikke tilvejebringes en god kvalitet af forankringen mellem knoglefragmentet og tappen, når sidstnævnte er blevet monteret. Endelig kan de kendte tappe, på grund af deres ringe 2ø ydeevne ved borings- eller gevindskæringsoperationen, forårsage uheldige spændinger i knoglen, når de er anbragt på plads.Known transcutaneous pins will not provide a bore or thread cutting of particularly good quality. As is the case with any drilling or thread cutting operation, the temperature rises at the site where the operation is taking place, which can cause necrosis and bone degradation. In addition, known pins will not produce good quality threaded surfaces. The surfaces are in some places torn out, and thus a good quality of the anchorage between the bone fragment and the pin will not be obtained when the latter has been mounted. Finally, because of their poor 2o performance in the drilling or thread cutting operation, the known pins may cause undue tension in the bone when placed in place.
Det er formålet med den foreliggende opfindelse at tilvejebringe en transkutan tap, som sikrer en boring eller en gevindskæring med god 25 kvalitet, samtidig med at der sikres mindst mulig temperaturstigning under indføringen.It is the object of the present invention to provide a transcutaneous pin which ensures a good quality bore or thread cutting while ensuring the least possible rise in temperature during insertion.
Den transkutane tap til fastgørelse af en knoglepart eller et fragment ifølge den foreliggende opfindelse er særpræget ved, at spånri lien(er-2q ne) er anbragt skrueformet i forhold til gevindets akse, og at skruelinien samt gevindet har stigning i samme retning.The transcutaneous pin for attaching a bone portion or fragment of the present invention is characterized in that the chip line (s-2q) is arranged helically in relation to the axis of the thread and that the helical line and the thread have an increase in the same direction.
Spånrillernes tilvejebringelse af en fri gangsundersænkning muliggør en gevindskæring med god kvalitet og med lettere gennemtrængning af snit-22 tappen ind i knoglen. Da spånerne ikke forbliver inde i knoglen under denne proces og således ikke udviser nogen forhindring for den efterfølgende skærende kant, vil temperaturen endvidere stige meget mindre end i forbindelse med kendte tappe.The chip grooves provide a free walk recess allowing for good quality thread cutting and easier penetration of the cut-22 pin into the bone. Furthermore, since the chips do not remain inside the bone during this process and thus show no obstacle to the subsequent cutting edge, the temperature will rise much less than in connection with known pins.
DK 168468 B1 3DK 168468 B1 3
Den forreste del af tappens gevind kan være udformet som en førende konus, hvor spånrillerne definerer de skærende kanter, som forløber over gevindets førende konus samt over begyndelsen af gevindets centrale cylindriske del.The front portion of the pin thread may be configured as a leading cone, with the chip grooves defining the cutting edges extending over the lead cone of the thread as well as over the beginning of the central cylindrical portion of the thread.
55
Der kan vælges et antal forskellige modifikationer ved fremstilling af spånrillerne, som danner de skærende kanter. Spånrillerne kan være udformet som et indsnit, der er dannet af to stort set vinkelrette flader, som er tilnærmelsesvis vinkelrette på hinanden eller i form af JO et indsnit med stort set afrundet tværsnit. Skruelinien og gevindet er tilvejebragt med stigning i samme retning. Spånrillerne er fortrinsvis tilvejebragt ved slibning, efter gevindet med dets førende konus er fremstillet.A number of different modifications can be selected when making the chip grooves which form the cutting edges. The chip grooves may be formed as a notch formed by two substantially perpendicular faces which are approximately perpendicular to each other or in the form of a JO a substantially rounded cross-section. The helical line and thread are provided with pitch in the same direction. The chip grooves are preferably provided by grinding after the thread with its leading cone is made.
15 Opfindelsen kan tilpasses forskellige typer tappe, hvad enten tappene kræver et forboret hul eller er selvborende tappe. I sidstnævnte tilfælde er tappen fordelagtigt forsynet med en borespids i det mindste indirekte nærliggende begyndelsen af gevindets førende konus.The invention can be adapted to different types of pins, whether the pins require a pre-drilled hole or are self-drilling pins. In the latter case, the pin is advantageously provided with a drill bit at least indirectly adjacent the beginning of the threaded cone.
20 Gevindet omfatter ligeledes en gennemboringstap, hvori der forud for gevindets førende konus er tilvejebragt en stang med en diameter, som er identisk med eller mindre end inderdiameteren for den gevindforsynede dels gevind, og hvilken stang ender i en plan spidsbue-formet borespids. Den plane spidsbue-formede spids kan på sin øvre del have 25 to frigangsudskæringer, der er anbragt modstillet hinanden.The thread also includes a piercing pin in which, prior to the threaded cone of the thread, a rod having a diameter identical to or less than the inner diameter of the threaded portion of the thread is provided, and which rod ends in a planar tip-shaped drill bit. The planar pointed arc-shaped tip may have at its upper part two clearance cutouts arranged opposite to each other.
Den plane spidsbue-formede spids kan have et tværsnit i form af et langstrakt parallellogram, som definerer to modstillede skæreflader, hver efterfulgt af en flade, som danner en frigangsvi nkel, hvilke skæ-2Q rende flader og frigangsflader tilsammen danner en skærende kant, og de skærende flader har en langstrakt ske-formet nedtrykning ved siden af den skærende kant, for således at ændre snitvinklen for at bibringe den en værdi på nul eller en positiv værdi. 1The planar pointed arc-shaped tip may have a cross-section in the form of an elongate parallelogram defining two opposite cutting faces, each followed by a face forming a clearance angle, which cutting faces and release faces together forming a cutting edge, and the cutting faces have an elongated spoon-shaped depression next to the cutting edge, thus changing the angle of incision to give it a value of zero or a positive value. 1
Opfindelsen vil herefter blive forklaret nærmere under henvisning til den medfølgende tegning, der alene som et eksempel viser flere udførelsesformer for den transkutane tap ifølge den foreliggende opfindelse, og hvor DK 168468 B1 4 fig. 1 viser et sidebiIlede til illustration af en første udførelsesform for en transkutan tap, fig. 2 et sidebillede til illustration af en anden udførelsesform for en transkutan tap, det vil sige en gennemboringstap, 5 fig. 3 et forstørret billede af enden af den i fig. 1 viste tap, således som set ved III i en første udførelsesform for en tap, der er monteret efter knoglen er blevet forboret til en passende diameter, og en sådan tap kaldes almindeligvis en halv-tap med stump spids, 10 fig· 4 et billede svarende til fig. 3 af en anden udførelsesform for en gennemboringstap, der endvidere er beregnet til at bore hullet før tilvejebringelsen af gevindskæringen, og en sådan tap kaldes en selv-borende og selv-gevindskærende halvtap, 15 fig. 5 et forstørret billede af den forreste ende af gevindet for en første udførelsesform for en gennemboringstap, fig. 6 et billede svarende til fig. 5 til illustration af en anden udførelsesform, fig. 7 et snitbillede taget langs linien VII-VII i fig. 5, 2o fig. 8 et snitbillede taget langs linien VIII-VIII i fig. 6, fig. 9 et forstørret detail bil!ede af spidsen af den i fig. 2 viste tap, således som indikeret ved pilen IX, og fig. 10 et snitbillede taget langs linien X-X gennem den i fig. 9 viste spids.The invention will now be explained in more detail with reference to the accompanying drawing, which shows, by way of example only, several embodiments of the transcutaneous tap according to the present invention, and in which FIG. 1 is a side elevational view illustrating a first embodiment of a transcutaneous pin; FIG. 2 is a side view illustrating another embodiment of a transcutaneous pin, i.e., a piercing pin; FIG. 3 is an enlarged view of the end of FIG. 1, as seen in III in a first embodiment of a pin mounted after the bone has been pre-drilled to a suitable diameter, and such pin is commonly called a half-tip with blunt tip; similar to FIG. 3 of another embodiment of a piercing pin further intended to drill the hole prior to providing the thread cut, and such a pin is called a self-drilling and self-threading half pin; FIG. 5 is an enlarged view of the front end of the thread for a first embodiment of a piercing pin; FIG. 6 is a view similar to FIG. 5 to illustrate another embodiment; FIG. 7 is a sectional view taken along line VII-VII of FIG. 5, FIG. 8 is a sectional view taken along line VIII-VIII of FIG. 6, FIG. 9 is an enlarged detail view of the tip of the one shown in FIG. 2, as indicated by arrow IX, and FIG. 10 is a sectional view taken along the line X-X through the one shown in FIG. 9.
2525
Den transkutane tap 1, som er vist i fig. 1 og 3, omfatter en gevindforsynet del 2, som er den forreste del af tappen og en bageste del 3, der omtales den glatte del 3. Tappen 1 er en cylindrisk tap med lille diameter i sammeligning med sin længde, og den bageste eller glatte 3Q del 3 er forsynet med en rille 4 og en firkantet afslutningsdel 5. Afslutningsdelen 5 muliggør brug af en klo eller borepatron til at drive tappen 1 ind i en knoglepart eller et fragment, medens rillen 4 er beregnet til borepatronens fastholdelse. Tappen l's forreste del 2 (se navnlig fig. 3) omfatter et gevind 6, hvis forreste del er udfor-35 met som en trunkeret førende konus 7, der ender i en stort set plan flade 8, der er vinkelret i forhold til tappens midtlinie.The transcutaneous pin 1 shown in FIG. 1 and 3 comprises a threaded portion 2 which is the front portion of the pin and a rear portion 3 referred to as the smooth portion 3. The pin 1 is a cylindrical pin of small diameter in comparison with its length, and the rear or smooth 3Q part 3 is provided with a groove 4 and a square end part 5. The end part 5 allows the use of a claw or drill cartridge to drive the pin 1 into a bone part or fragment, while the groove 4 is intended for holding the drill cartridge. The front portion 2 of the pin 1 (see, in particular, Fig. 3) comprises a thread 6, the front portion of which is formed as a truncated leading cone 7, ending in a substantially flat surface 8 perpendicular to the center line of the pin. .
I fig. 3,5 og 6 er tre spånriller 9 anbragt med en adskillelse på 120° over omkredsen af den forreste ende af tappen for at udføre gevindskæ- DK 168468 B1 5 ringsoperationen. Disse spånriller 9 er tilvejebragt i form af to vinkelrette flader 10 og 11, hvor fladen 10 definerer snittappens skærende kant 12 ved sin frie ende (se også tværsnittet i fig. 7). Hver af de skærende kanter 12 er i tappens rotationsretning efterfulgt af en 5 frigangsundersænkning 13, som nærmer sig tappens midtlinie, indtil den skærer fladen 11 for den efterfølgende spånri Ile 9.In FIG. 3.5 and 6, three chip grooves 9 are positioned at 120 ° apart over the circumference of the front end of the pin to perform the thread cutting operation. These chip grooves 9 are provided in the form of two perpendicular faces 10 and 11, with the surface 10 defining the cutting edge 12 of the cut pin at its free end (see also the cross-section of Figure 7). Each of the cutting edges 12 is in the direction of rotation of the pin followed by a clearance submergence 13 which approaches the center line of the pin until it intersects the surface 11 of the subsequent chip line Ile 9.
Spånrillerne 9 er fortrinsvis tilvejebragt ved slibning. Slibningsoperationen udføres med en rundslibemaskine, som bevæges tangenti alt over jq enden af gevindet 6. Slibningen af spånrillerne 9 tilvejebringer en god overfladekvalitet ved den skærende kant og overflødiggør enhver efterfølgende efterbehandlingsoperation. Frigangsundersænkningen 13 er fremstillet på samme måde ved at bringe en slibemaskine frem til enden af tappen og dreje sidstnævnte, medens slibemaskinen bringes nærmere 25 tappens midtlinie.The chip grooves 9 are preferably provided by grinding. The grinding operation is carried out with a circular grinding machine which is moved tangentially all over the end of the thread 6. The grinding of the chip grooves 9 provides a good surface quality at the cutting edge and eliminates any subsequent finishing operation. The release recess 13 is made in the same way by bringing a grinder to the end of the pin and turning the latter, while bringing the grinder closer to the center line of the pin.
Selv om tilvejebringelsen af spånrillerne 9 og frigangsundersænkningen ved slibning har givet meget gode resultater er det indlysende for en fagmand på området, at de også kan tilvejebringes ved fræsning eller 20 ved hjælp af andre egnede midler.Although the provision of the chip grooves 9 and the clearance submerged by grinding has produced very good results, it will be obvious to one skilled in the art that they may also be provided by milling or by other suitable means.
Den i fig. 3 viste type tap anvendes mere specifikt for at blive anbragt i knogler i en sådan stilling, at tappens spids ved udgangen fra den anden cortex ikke risikere at beskadige vævene i nærheden af knog- 25 len· I andre anvendelsessituationer kan det imidlertid være ønskeligt at montere en såkaldt gennemboringstap eller en såkaldt transfikseringstap, som er en succesivt selv-borende og selv-gevindskærende tap sva-gø rende til de, der er vist i fig. 2 og 4.The FIG. 3 type of pin is used more specifically to be placed in bones in such a position that the tip of the pin at the exit from the second cortex does not run the risk of damaging the tissues near the bone. However, in other application situations it may be desirable to mount a so-called piercing pin or a so-called transfixing pin which is a successful self-drilling and self-threading pin similar to those shown in FIG. 2 and 4.
I fig. 4 vil tappen ligesom i den foregående beskrivelse omfatte et gevind, som afsluttes af en trunkeret konisk del 7. Den adskiller sig alligevel ved, at den trunkerede konus 7 er forbundet med en cylin-oc drisk del 28, der fremviser en diameter, som er større end inderdiame-In FIG. 4, as in the previous description, the pin will comprise a thread terminated by a truncated conical portion 7. It is nevertheless distinguished in that the truncated cone 7 is connected to a cylindrical and cylindrical portion 28 which exhibits a diameter which is larger than inner diadem
JJJJ
teren for gevindet, og som på sin side afsluttes af en spids 29 med stort set konisk form. Den cylindriske del 28 gør det muligt at undgå karambolage mellem borings- og gevindskæringsoperationerne i cortical knogler med almindelig tykkelse, hvilket vil vanskeliggøre den korrek- DK 168468 B1 6 te skæring af et gevind i knoglen. I denne udførelsesfonn omfatter tappen to symmetriske spånri11 er 30.the end of the thread, and which in turn is terminated by a tip 29 of substantially conical shape. The cylindrical portion 28 makes it possible to avoid carambolation between the drilling and thread cutting operations in ordinary thickness cortical bones, which will hamper the proper cutting of a thread in the bone. In this embodiment, the pin comprises two symmetrical chips 11.
Alternativt kan der være tilvejebragt en gennemboringstap, således som 5 vist i fig. 2, og ligesom den i fig. 1 viste tap omfattende en gevindforsynet del 2, en bageste del 3, som har en ringformet rille 4 nærliggende sin ende, og en firkantet endedel 5, der er beregnet til at blive modtaget af en fremføringspatron.Alternatively, a piercing pin may be provided, as shown in FIG. 2, and like the one in FIG. 1, including a threaded portion 2, a rear portion 3 having an annular groove 4 adjacent its end, and a square end portion 5 intended to be received by a feed cartridge.
jg Den gevindforsynede del 2 omfatter et gevind 6 med en førende konus 7 svarende til den, som er vist i fig. 3. Også her kan gevindskærings-spånriller 9 være dannet ved hjælp af en rundslibemaskine, der bevæges tangentialt i forhold til tappens midtlinie begyndende fra stangen 16, som går forud for den trunkerede konus 8, og som går over i gevindet 15 6· Stangen 16 afsluttes forrest i en skærende spids 17, der er bereg net til at bore et hul, og som er vist mere detaljeret i fig. 9.The threaded portion 2 comprises a thread 6 with a leading cone 7 similar to that shown in FIG. 3. Here, too, thread-cutting chip grooves 9 may be formed by means of a circular grinder moving tangentially with respect to the center line of the pin starting from the rod 16 which precedes the truncated cone 8 and passing into the thread 15 6 · The rod 16 is terminated at the front in a cutting tip 17, which is intended for drilling a hole, and which is shown in more detail in FIG. 9th
Spidsen 17 ved enden af stangen 16 for gennemboringstappen, der er vist i fig. 2, er udformet som en spidsbue eller projektil 22, hvilken 2Q spidsbue har to frigangsudskæringer 23 i sin øvre del (se fig. 9). Den spidsbue-formede spids 22 har nogle særdeles interessante udformningstræk, der fremgår af fig. 9 og af det i fig. 10 viste tværsnit, hvilket illustrerer en konfiguration i form af et langstrakt parallellogram, der omfatter to skærende flader 24, som hver definerer en skæ-25 rende kant 25, som er efterfulgt af en frigangsflade 26. Hvis spidsen drejes i rotationsretningen, som er indikeret ved hjælp af en pil F, bemærkes det, af fladerne 26 definerer en tilstrækkelig stor frigangs-vinkel til at muliggøre frigøring af spåner, som er frembragt under boringen i en knogle ved hjælp af spidsbuen 22. På den anden side vil en fagmand på området fra fig. 9 bemærke, at de plane flader 24, som definerer skærende flader, har en negativ snitvinkel a. For at modificere denne snitvinkel α og bibringe den en værdi på 0 eller en positiv værdi, er der tilvejebragt to langstrakte nedtrykninger 27 nærliggende den skærende kant 25. Således kan snitvinklen α indstilles og vælges i overensstemmelse med brugerens ønske ved at ændre dybden af nedtryk-The tip 17 at the end of the rod 16 for the piercing pin shown in FIG. 2, is formed as a pointed arch or projectile 22, the 2Q pointed arch having two clearance cutouts 23 in its upper part (see Fig. 9). The tip-arc-shaped tip 22 has some very interesting design features shown in FIG. 9 and from the one shown in FIG. 10, illustrating a configuration in the form of an elongated parallelogram comprising two cutting faces 24, each defining a cutting edge 25 followed by a clearance surface 26. If the tip is rotated in the direction of rotation indicated by means of an arrow F, it is noted that the surfaces 26 define a sufficiently large angle of clearance to enable the release of chips produced during drilling in a bone by means of the tip arc 22. On the other hand, one skilled in the art will from FIG. 9 note that the planar faces 24 defining intersecting faces have a negative cut angle α. To modify this cut angle α and impart a value of 0 or a positive value, two elongated depressions 27 are provided adjacent the cutting edge 25 Thus, the cut angle α can be set and selected according to the user's desire by changing the depth of the depression.
i Oin Island
ningerne 27.nings 27.
Den spids, som er vist i fig. 9 og 10, vil med sin spidsbue-form, sine frigangsflader 26 og sine nedtrykninger 27, som tilvejebringer en 7 DK 168468 B1 snitvinkel med en værdi på O eller en positiv værdi, tilvejebringe en boring med meget god kvalitet i sammenligning med kendte boretappe. Den spidsbue-formede spids er desuden særlig velegnet, da den fikserer sig selv i knoglen og vil bore et hul langs en akse uden nogen lateral 5 afvigelse.The tip shown in FIG. 9 and 10, with its pointed arc shape, its release faces 26 and its depressions 27, which provide a cut angle of a value of 0 or a positive value, will provide a very good quality bore in comparison with known drilling pins. The tip-arc-shaped tip is also particularly suitable as it fixes itself in the bone and will drill a hole along an axis without any lateral deviation.
Den tap, der lige er beskrevet under henvisning til fig. 1,3 og 4, kan variere mellem 75 og 200 mm i total længde med diametre i et område fra 3-6 mm. Den trunkerede konus har typisk en hældning på 12°.The pin just described with reference to FIG. 1.3 and 4, can vary between 75 and 200 mm in total length with diameters in a range of 3-6 mm. The truncated cone typically has a slope of 12 °.
1010
Tappen ifølge den i fig. 2 viste udførelsesform med en central gevindforsynet del kan være fra 175-350 mm i total længde med diametre, der ligeledes er inden for et område fra 3-6 mm. Den forreste del af den i fig. 2 viste tap omfattende stangen 16 har en diameter, som er iden-15 tisk med eller mindre end inderdiameteren for gevindforsynede del 6. For en 3,4,5 eller 6 mm tap kan delen 16 have en diameter, som respektivt er 2,3,4 og 5 mm. I tilfældet med den i fig. 2 viste tap er det fordelagtigt at tilvejebringe en 6° trunkeret førende konus.The pin according to FIG. 2 with a central threaded portion may be from 175-350 mm in total length with diameters which are also within a range of 3-6 mm. The front portion of the one shown in FIG. 2, including the rod 16 having a diameter identical to or less than the inner diameter of threaded portion 6. For a 3.4,4 or 6 mm pin, portion 16 may have a diameter of 2.3, respectively. , 4 and 5 mm. In the case of the one shown in FIG. 2, it is advantageous to provide a 6 ° truncated leading cone.
2q I de forskellige eksempler er gevindet et enkelt gevind, men det er selvfølgeligt muligt alternativt at tilvejebringe flergængede gevind, og snittappene passerer successivt flere gange i den samme gevindskæ-ringsspånrille.2q In the various examples, the thread is a single thread, but of course it is possible to alternatively provide multi-threaded threads, and the cut pins pass successively several times in the same thread cutting groove.
25 30 3525 30 35
Claims (11)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH5070/85A CH666398A5 (en) | 1985-11-28 | 1985-11-28 | Transcutaneous pin for fixation of bone part or fragment |
CH507085 | 1985-11-28 | ||
CH407186 | 1986-10-13 | ||
CH4071/86A CH671150A5 (en) | 1986-10-13 | 1986-10-13 |
Publications (3)
Publication Number | Publication Date |
---|---|
DK574686D0 DK574686D0 (en) | 1986-11-28 |
DK574686A DK574686A (en) | 1987-05-29 |
DK168468B1 true DK168468B1 (en) | 1994-04-05 |
Family
ID=25694574
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DK574686A DK168468B1 (en) | 1985-11-28 | 1986-11-28 | Transcutaneous pin, and preparation thereof, for attaching a bone portion or fragment. |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0230856B1 (en) |
DE (2) | DE3674764D1 (en) |
DK (1) | DK168468B1 (en) |
ES (1) | ES2018168B3 (en) |
FI (1) | FI92975C (en) |
GR (1) | GR3001031T3 (en) |
IE (1) | IE59317B1 (en) |
IL (1) | IL80705A0 (en) |
NO (1) | NO170872C (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2622432A1 (en) * | 1987-11-03 | 1989-05-05 | Emile Letournel | Screwable cotyle ring for hip prosthesis |
CH681957A5 (en) * | 1988-11-17 | 1993-06-30 | Synthes Ag | |
SE510158C2 (en) * | 1992-10-29 | 1999-04-26 | Medevelop Ab | Anchorage elements for supporting prostheses and the use of such anchorage elements for fixing dentures |
AU5559694A (en) * | 1992-11-28 | 1994-06-22 | Thomas Schewior | Self-drilling cutting wire for piercing through bones, fixing and if required bracing bones or bone fragments |
SE9301407D0 (en) * | 1993-04-27 | 1993-04-27 | Medevelop Ab | BEFORE IMPLANTATION IN WEAVEN PROVIDED FOR THE ANCHORING ORGANIZATION FOR THE PROCESSING OF PROCESSES, ARTIFICIAL ARTICLE COMPONENTS OR LIKE |
CH688222A5 (en) * | 1993-12-07 | 1997-06-30 | Synthes Ag | Bone fixation element. |
FR2721819B1 (en) * | 1994-07-04 | 1996-10-04 | Amp Dev | SELF-DRILLING AND SELF-TAPPING ANKLE DEVICE WITH A SHRINKABLE END CAP, FOR LOCKING AN OSTEOSYNTHESIS PLATE OR COAPTING TWO BONE FRAGMENTS |
US6135772A (en) * | 1994-08-15 | 2000-10-24 | Jones; Shedrick D. | Method and apparatus for implantation |
FR2759282B1 (en) * | 1997-02-10 | 1999-05-07 | Eos Medical | BREAKABLE SCREW DEVICE FOR OSTEOSYNTHESIS PLATE OR FOR COAPTATION OF TWO BONE FRAGMENTS |
AU2043799A (en) | 1998-02-05 | 1999-08-23 | Institut Straumann Ag | Endo-osseal dental implant with a self-cutting screw |
DE29823113U1 (en) * | 1998-12-28 | 2000-05-11 | Howmedica GmbH, 24232 Schönkirchen | Femoral neck screw |
WO2001001000A1 (en) * | 1999-06-28 | 2001-01-04 | Aoyama Seisakusho Co., Ltd. | Tapping screw |
FR2821131B1 (en) * | 2001-02-22 | 2003-12-12 | Spine Next Sa | FASTENING SCREW |
FI110575B (en) * | 2001-05-16 | 2003-02-28 | Inion Ltd | Tool for making threaded surgical holes |
US20050171551A1 (en) * | 2003-10-21 | 2005-08-04 | William Sukovich | Instrument and method for preparing a bone to receive an implant |
EP2606932A1 (en) | 2011-12-21 | 2013-06-26 | Ion Beam Applications S.A. | Hadron therapy apparatus with a compact gantry structure |
US9687284B2 (en) * | 2013-02-13 | 2017-06-27 | Stryker European Holdings I, Llc | Locking peg with extended thread |
CN107468321B (en) * | 2017-08-17 | 2018-12-21 | 中南大学湘雅医院 | Bone screw bolt and manufacturing process thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2388482A (en) * | 1943-01-16 | 1945-11-06 | Herbert H Haynes | Surgical screw |
US2393982A (en) * | 1945-01-06 | 1946-02-05 | Josef H Glesen | Fracture reducer |
US4414966A (en) * | 1981-04-09 | 1983-11-15 | Ace Orthopedic Manufacturing, Inc. | Fixation pin |
ES8302449A2 (en) * | 1981-12-09 | 1983-01-16 | Lazo De Zbikowski Juan | Functional attachment system for osteosynthesis |
US4537185A (en) * | 1983-06-10 | 1985-08-27 | Denis P. Stednitz | Cannulated fixation screw |
-
1986
- 1986-11-20 IL IL80705A patent/IL80705A0/en unknown
- 1986-11-24 DE DE8686810535T patent/DE3674764D1/en not_active Expired - Lifetime
- 1986-11-24 ES ES86810535T patent/ES2018168B3/en not_active Expired - Lifetime
- 1986-11-24 EP EP86810535A patent/EP0230856B1/en not_active Expired - Lifetime
- 1986-11-26 DE DE8631649U patent/DE8631649U1/en not_active Expired
- 1986-11-27 IE IE312386A patent/IE59317B1/en not_active IP Right Cessation
- 1986-11-27 FI FI864830A patent/FI92975C/en not_active IP Right Cessation
- 1986-11-27 NO NO864770A patent/NO170872C/en unknown
- 1986-11-28 DK DK574686A patent/DK168468B1/en not_active IP Right Cessation
-
1990
- 1990-10-31 GR GR90400854T patent/GR3001031T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
IL80705A0 (en) | 1987-02-27 |
DK574686A (en) | 1987-05-29 |
FI864830A (en) | 1987-05-29 |
EP0230856B1 (en) | 1990-10-03 |
DK574686D0 (en) | 1986-11-28 |
FI864830A0 (en) | 1986-11-27 |
DE8631649U1 (en) | 1987-03-05 |
GR3001031T3 (en) | 1992-01-20 |
FI92975C (en) | 1995-02-10 |
NO170872C (en) | 1992-12-23 |
IE59317B1 (en) | 1994-02-09 |
EP0230856A1 (en) | 1987-08-05 |
NO864770D0 (en) | 1986-11-27 |
FI92975B (en) | 1994-10-31 |
DE3674764D1 (en) | 1990-11-08 |
ES2018168B3 (en) | 1991-04-01 |
IE863123L (en) | 1987-05-28 |
NO170872B (en) | 1992-09-14 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AHB | Application shelved due to non-payment | ||
B1 | Patent granted (law 1993) | ||
PBP | Patent lapsed |