DE29904852U1 - Medical nail - Google Patents
Medical nailInfo
- Publication number
- DE29904852U1 DE29904852U1 DE29904852U DE29904852U DE29904852U1 DE 29904852 U1 DE29904852 U1 DE 29904852U1 DE 29904852 U DE29904852 U DE 29904852U DE 29904852 U DE29904852 U DE 29904852U DE 29904852 U1 DE29904852 U1 DE 29904852U1
- Authority
- DE
- Germany
- Prior art keywords
- webs
- recrystallization
- medical nail
- medical
- annealed
- 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.)
- Expired - Lifetime
Links
- 238000001953 recrystallisation Methods 0.000 claims description 12
- 238000010894 electron beam technology Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 238000000137 annealing Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005482 strain hardening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
- A61B17/7283—Intramedullary devices, e.g. pins or nails with special cross-section of the nail
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/26—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for needles; for teeth for card-clothing
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- 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 or setting implements
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/72—Intramedullary devices, e.g. pins or nails
- A61B17/7233—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone
- A61B17/7258—Intramedullary devices, e.g. pins or nails with special means of locking the nail to the bone with laterally expanding parts, e.g. for gripping the bone
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2221/00—Treating localised areas of an article
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
Landscapes
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Biomedical Technology (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Neurology (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thermal Sciences (AREA)
- Metallurgy (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Materials For Medical Uses (AREA)
Description
·: ":: :"::. &igr;'&Iacgr;&igr;'&Lgr;&zgr; 299 ÖH 8S2.T- ·: ": : :"::. &igr;'&Iacgr;&igr;'&Lgr;&zgr; 299 ÖH 8S2.T-
• ··
Ausfertigung 12.03.99 Medizinischer Nagel Issue 12.03.99 Medical nail
Die Erfindung betrifft einen medizinischen Nagel. Medizinische Nägel bestehen aus einem dünnwandigen Rohr, bei welchem außen über dem Umfang verteilt, vorzugsweise 4 Stege angeordnet sind. Die Nägel werden beim medizinischen Einsatz in axialer Richtung zusammengefaltet. Nach dem Einsetzen im Knochen werden die Nägel mittels eines Druckmediums aufgeblasen. Dazu ist es erforderlich, daß die dünnen Wände eine hohe Zähigkeit aufweisen um die zweimal notwendige Verformung zuzulassen.The invention relates to a medical nail. Medical nails consist of a thin-walled tube, in which preferably 4 webs are arranged around the outside of the circumference. The nails are folded together in an axial direction for medical use. After being inserted into the bone, the nails are inflated using a pressure medium. For this purpose, the thin walls must have a high degree of toughness in order to allow the necessary deformation twice.
Bei der mechanischen Bearbeitung, d. h. dem Reduzieren der Dicke der Rohrwandung in bestimmten Bereichen tritt eine Kaltverfestigung ein, durch die die Zähigkeit und Umformbarkeit vermindert wird. Es tritt eine metallographische Veränderung ein, indem Gitterbaufelder, wie Texturen oder Stufenversetzungen entstehen. Außerdem können bei der mechanischen Bearbeitung die Wanddicken nur bei hohem Aufwand einheitlich eingestellt werden.During mechanical processing, i.e. reducing the thickness of the pipe wall in certain areas, work hardening occurs, which reduces the toughness and formability. A metallographic change occurs in that lattice fields such as textures or step dislocations are created. In addition, during mechanical processing, the wall thicknesses can only be set uniformly with great effort.
Diese beim Einsatz erforderlichen Materialeigenschaften können nur durch das an sich bekannte Rekristallisationsglühen erreicht werden. Dadurch werden die Kaltverfestigung beseitigt und die Korngröße ist ohne Phasenumwandlung einstellbar.These material properties required for use can only be achieved through the well-known recrystallization annealing process. This eliminates work hardening and the grain size can be adjusted without phase transformation.
Es ist bekannt, diese Rekristallisation durch die sog. Haubenglühung durchzuführen oder im Durchlaufglühen. Das bedeutet, daß das gesamte Volumen des Nagels geglüht wird. Damit werden zwar die Mängel in den dünnen Wandungen beseitigt, aber die Veränderung ist nicht nur auf die Wände begrenzt, sondern es werden auch die Materialeigenschaften des Steges beeinflußt, was ein entscheidender Mangel für den Einsatz der Nägel ist.It is known that this recrystallization can be carried out by means of the so-called hood annealing or by continuous annealing. This means that the entire volume of the nail is annealed. This eliminates the defects in the thin walls, but the change is not limited to the walls, but also affects the material properties of the web, which is a decisive defect for the use of the nails.
Der Erfindung liegt die Aufgabe zugrunde, einen medizinischen Nagel zu schaffen, der aus einem dünnwandigen Rohr besteht und außen über dem Umfang längs Stege besitzt. Die wesentlichen Materialeigenschaften, wie Umformbarkeit und Zähigkeit dürfen nur in definierten Bereichen bestehen. Diese definierten Bereiche sind axial verlaufende dünne Wände zwischen den Stegen. Die anderen Bereiche, das sind die Stege, müssen hohe Festigkeit besitzen.The invention is based on the object of creating a medical nail that consists of a thin-walled tube and has webs along the outside circumference. The essential material properties, such as formability and toughness, must only exist in defined areas. These defined areas are axially running thin walls between the webs. The other areas, i.e. the webs, must have high strength.
Erfindungsgemäß wird die Aufgabe nach dem Merkmalen des Anspruches 1 gelöst. Vorteilhafte Ausgestaltungen des Verfahrens sind in den Ansprüchen 1 bis 4 beschrieben. Das Wesen der Erfindung besteht darin, daß der von seiner Ausführung her bekannte medizinische Nagel, aus einem dünnwandigen Rohr mit am Umfang axial verlaufend verteiltAccording to the invention, the object is achieved according to the features of claim 1. Advantageous embodiments of the method are described in claims 1 to 4. The essence of the invention consists in the fact that the medical nail known from its design consists of a thin-walled tube with axially distributed
angeordneten Stegen, daß der Bereich des Rohres zwischen den Stegen und ggf. auch Flanken der Stege durch Einwirkung eines Energiestrahles, insbesondere Elektronenstrahl rekristallisationsgeglüht sind. Diese Bereich, insbesondere die zwischen den Stegen müssen für die Anwendung des medizinischen Nagels zäh und gut verformbar sein. Bei der Herstellung sind die unterschiedlichen Materialeigenschaften der Stege und Zwischenräume nicht erreichbar.arranged webs, that the area of the tube between the webs and possibly also the flanks of the webs are recrystallization annealed by the action of an energy beam, in particular an electron beam. These areas, in particular those between the webs, must be tough and easily deformable for the use of the medical nail. During production, the different material properties of the webs and gaps cannot be achieved.
Das Verfahren zur Erzeugung dieser Materialeigenschaften besteht darin, daß die durch den Elektronenstrahl erzeugten Energieübertragungsfelder, axial zum Rohr verlaufende Bahnen bilden, die in ihrer Breite und Lage auf dem Rohr durch den rechtwinklig zur Achse des Rohres abgelenkten Elektronenstrahl so erzeugt werden, daß sie vorzugsweise im Abstand voneinander seitlich bis an die Kante reichen, wo die Dicke der Rohrwandung größer wird, oder bei einem am äußeren Umfang angebrachten Steg bis an dessen Kante reichen. In das Verfahren gehen die Zusammensetzung des Rohrmaterials, dessen Ausgangszustand, die erforderliche Glühtemperatur für den Rekristallisationsprozeß, die Prozeßdauer für einen Durchlauf, sowie die Aufheiz- und Abkühlgeschwindigkeit ein. Die Rekristallisationstemperatur liegt in der Regel unter 730 0C. Diese kann jedoch bei hoher Aufheizgeschwindigkeit, wie es durch die Einwirkung des Elektronenstrahls möglich ist, über 800 0C liegen.The process for producing these material properties consists in the energy transfer fields generated by the electron beam forming paths running axially to the pipe, the width and position of which on the pipe is generated by the electron beam deflected at right angles to the axis of the pipe in such a way that they preferably extend laterally at a distance from one another to the edge where the thickness of the pipe wall increases, or, in the case of a web attached to the outer circumference, to the edge of the web. The process takes into account the composition of the pipe material, its initial state, the annealing temperature required for the recrystallization process, the process duration for one run, and the heating and cooling speed. The recrystallization temperature is usually below 730 ° C. However, this can be over 800 ° C at a high heating rate, as is possible with the effect of the electron beam.
An einem Ausführungsbeispiel wird die Erfindung beschrieben. In der zugehörigen Zeichnung zeigen:The invention is described using an embodiment. The accompanying drawing shows:
Fig. 1: einen medizinischen Nagel in einer Ansicht,Fig. 1: a medical nail in a view,
Fig. 2: einen Schnitt durch Fig. 1,Fig. 2: a section through Fig. 1,
Fig. 3: eine vergrößerte Darstellung als Ausschnitt von Fig. 2.Fig. 3: an enlarged view as a detail of Fig. 2.
Ein medizinischer Nagel wird in bekannter Weise durch ein mechanisches Verfahren aus einem Rohr mit einem Durchmesser D hergestellt, indem das Material über den Umfang derart abgetragen wird, daß Stege 1 stehen bleiben und die dazwischen verbleibenden Wände 2 wesentlich dünner werden.A medical nail is manufactured in a known manner by a mechanical process from a tube with a diameter D in which the material is removed over the circumference in such a way that webs 1 remain and the walls 2 remaining between them become considerably thinner.
Die Wand 2 zwischen den Stegen 1 muß zäh und gut verformbar sein, über die gesamte Länge L des Nagels. Die dazu erforderliche Temperatur zur Rekristallisation ist bekannt und liegt bei ca. 730 0C, wenn das Rohr aus Stahl besteht. Die Rekristallisationstemperatur ist bekannterweise von dem Kaltverformungsgrad abhängig.The wall 2 between the webs 1 must be tough and easily deformable over the entire length L of the nail. The temperature required for recrystallization is known and is around 730 0 C if the pipe is made of steel. The recrystallization temperature is known to depend on the degree of cold deformation.
Das Verfahren läuft ab, daß die Temperatur für die Rekristallisation entsprechend dem Verformungsgrad und Werkstoff festgelegt wird. Der dazu erforderliche Energieeintrag auf das erzeugte Energieübertragungsfeld, d. h. die beiden Teilfelder E1 und E2, wird durch die Wahl der Parameter des Elektronenstrahls 3 ermittelt. Damit liegt auch annähernd die erforderlicheThe process involves setting the temperature for recrystallization according to the degree of deformation and material. The energy input required for this into the generated energy transfer field, i.e. the two subfields E1 and E2, is determined by selecting the parameters of the electron beam 3. This also approximately determines the required
Oberflächentemperatur als Sollwerttemperatur fest. Längs der Achse des Rohres verlaufen in diesen Bereichen die Bahnen, die vollständig rekristallisieren.Surface temperature is set as the setpoint temperature. The paths that completely recrystallize run along the axis of the pipe in these areas.
Der Rekristallisationprozeß ist auch mit anderen lokalen Energiequellen, z.B. Laser, WIG, oder durch Induktionserwärmung ausführbar.The recrystallization process can also be carried out with other local energy sources, e.g. laser, TIG, or by induction heating.
Die Erfindung ist nicht auf medizinische Nägel begrenzt, sondern es können auch andere geometrische Körper in bestimmten Bereichen vom Energiestrahl beaufschlagt werden, um die Materialeigenschaften partiell zu verändern.The invention is not limited to medical nails, but other geometric bodies can also be exposed to the energy beam in certain areas in order to partially change the material properties.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29904852U DE29904852U1 (en) | 1999-02-27 | 1999-02-27 | Medical nail |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19908715 | 1999-02-27 | ||
| DE1999108715 DE19908715C1 (en) | 1999-02-27 | 1999-02-27 | Surgical nail for fastening bones comprises thin-walled tube with ribs |
| DE29904852U DE29904852U1 (en) | 1999-02-27 | 1999-02-27 | Medical nail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE29904852U9 DE29904852U9 (en) | |
| DE29904852U1 true DE29904852U1 (en) | 1999-05-27 |
Family
ID=26052109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE29904852U Expired - Lifetime DE29904852U1 (en) | 1999-02-27 | 1999-02-27 | Medical nail |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE29904852U1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000044946A1 (en) * | 1998-03-06 | 2000-08-03 | Disc-O-Tech Medical Technologies, Ltd. | Metal processing method |
| WO2003065913A1 (en) * | 2002-02-06 | 2003-08-14 | Wittenstein Ag | Device, especially an intramedullary nail and/or a sleeve for inserting into tubular bones |
| USRE47427E1 (en) | 1999-01-27 | 2019-06-11 | Medtronic Holding Company Sárl | Expandable intervertebral spacer |
-
1999
- 1999-02-27 DE DE29904852U patent/DE29904852U1/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000044946A1 (en) * | 1998-03-06 | 2000-08-03 | Disc-O-Tech Medical Technologies, Ltd. | Metal processing method |
| USRE47427E1 (en) | 1999-01-27 | 2019-06-11 | Medtronic Holding Company Sárl | Expandable intervertebral spacer |
| WO2003065913A1 (en) * | 2002-02-06 | 2003-08-14 | Wittenstein Ag | Device, especially an intramedullary nail and/or a sleeve for inserting into tubular bones |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0327628A1 (en) | Orthodontic accessory with marking and process for manufacturing same | |
| WO2013189597A1 (en) | Method and device for producing a press-hardened metal component | |
| DE102015203644A1 (en) | Press-hardened sheet metal part with different sheet thicknesses and strengths | |
| DE102016013466A1 (en) | Body component for a motor vehicle and method for producing a body component | |
| DE102012012518A1 (en) | Hot forming tool for the production of molded parts | |
| EP2551050B1 (en) | Method for welding thin-walled pipes using peak temperature welding | |
| DE29904852U1 (en) | Medical nail | |
| DE29904852U9 (en) | Medical nail | |
| DE102017201674B3 (en) | Method for producing a press-hardened component and press mold | |
| DE10044682C2 (en) | Method and circuit board for producing a cold-formed component from sheet steel and use of a circuit board | |
| DE102017207525A1 (en) | A method of making a coolable mold and method of making a molded part | |
| DE10202212B4 (en) | Method for producing a band or sheet made of a metallic composite material | |
| EP3358021A1 (en) | High-strength screw with a softened stud | |
| DE19908715C1 (en) | Surgical nail for fastening bones comprises thin-walled tube with ribs | |
| DE102011114691A1 (en) | Three-dimensional partial hot-working and subsequently partial hardening of a workpiece, comprises partially heating a workpiece by a heating device to a temperature, which is greater than or equal to the workpiece-specific-temperature | |
| DE2543369A1 (en) | PROCESS FOR MANUFACTURING THREAD AND THREAD PART MANUFACTURED AFTER THAT | |
| DE102013200287A1 (en) | Method for the production of a structural component of a vehicle | |
| DE102006042830B3 (en) | Press-quenched steel component production comprises temporarily spraying blank with cooling medium by feeding medium through feed channels into die before closing die | |
| DE2740981B2 (en) | Punching knife | |
| DE1965272A1 (en) | Lightweight structural element of varying - density | |
| DE102017102547A1 (en) | Method for producing a protective element of a motor vehicle and protective element produced by the method and motor vehicle with at least one such protective element | |
| DE102006023567A1 (en) | Rolling bearing component and method for producing such | |
| DE102016103668B3 (en) | Soft and hard-cut motor vehicle component and method for its production | |
| DE102016203969A1 (en) | Process for the heat treatment of a flat steel product, heat-treated steel flat product and its use | |
| DE2601625C3 (en) | Method and device for quenching and tempering thin-walled large pipes made of steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R207 | Utility model specification |
Effective date: 19990708 |
|
| R156 | Lapse of ip right after 3 years |
Effective date: 20020829 |