DE4118303A1 - Bone fracture therapeutical instrument - is external frame with variable and measurable pressure and traction forces - Google Patents

Bone fracture therapeutical instrument - is external frame with variable and measurable pressure and traction forces

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Publication number
DE4118303A1
DE4118303A1 DE19914118303 DE4118303A DE4118303A1 DE 4118303 A1 DE4118303 A1 DE 4118303A1 DE 19914118303 DE19914118303 DE 19914118303 DE 4118303 A DE4118303 A DE 4118303A DE 4118303 A1 DE4118303 A1 DE 4118303A1
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Prior art keywords
interfragmentary
components
spring
external fixator
pressure
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DE19914118303
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German (de)
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Wolfgang Dr Med Fitz
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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
    • A61B17/60—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 for external osteosynthesis, e.g. distractors, contractors
    • A61B17/64—Devices extending alongside the bones to be positioned
    • A61B17/6491—Devices extending alongside the bones to be positioned allowing small-scale motion of bone ends
    • 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
    • A61B17/60—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 for external osteosynthesis, e.g. distractors, contractors
    • A61B2017/606—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 for external osteosynthesis, e.g. distractors, contractors with resilient spring element

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  • Health & Medical Sciences (AREA)
  • Orthopedic Medicine & Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Surgery (AREA)
  • Medical Informatics (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Surgical Instruments (AREA)
  • Prostheses (AREA)

Abstract

The external instrument gives dynamic axial loading and quantifiable traction or pressure forces are exerted on the interfragmentary areas by spring components (1). These components are either combined with or not with a damping component (2) in order e.g. to neutralise the wt. force of the patient on the interfragmentary area. Axially to the spring components and/or damping component, pressure measurement probes (3) can be applied in order to measure the interfragmentary traction or pressure forces. The spring and damping components fitted axially exert the traction or pressure force via solid, fluid or gas-form media. Pins or nails are used to fix such components in position to the fractured bone. USE - In orthopaedic practice, to treat fractures, pseudo-arthritis deformans, post-traumatic bone defects, and extension osteotomy cases.

Description

Gattung des AnmeldegegenstandesGenus of Subject of registration

Die Erfindung betrifft einen axial dynamisierbaren Fixa­ teur extern, bei dem die interfragmentären Druck- und Zugkräfte quantifizierbar sind. Die interfragmentären Druck- oder Zugkräfte sind unabhängig von den Druck­ oder Zugkräften, insbesonders des Körpergewichtes.The invention relates to an axially dynamic Fixa expensive external, where the interfragmentary printing and Tensile forces are quantifiable. The interfragmentary Push or pull forces are independent of the pressure or tensile forces, especially body weight.

Stand der TechnikState of the art

Der Einsatz des Fixateur extern in der Knochenbehand­ lung ist weit verbreitet und nicht wegzudenken. Wegen der einfacheren Zugangswege und der einfacheren Appli­ kation, gegenüber den internen Osteosynthesen, gewinnt der Fixateur extern in letzter Zeit zunehmend an Bedeu­ tung (z B.: M. Zerna. R. Klenke, External fixator in the district hospital. Zentralbl-Chirurgie, P 1031-1040. 115 (16) , 1900). Bei der offenen Frakturbehandlung wird zuneh­ mend die Versorgung mit dem Fixateur extern als defini­ tive Versorgung angesehen und durchgeführt. Ferner werden Pseudoarthrosen, posttraumatische Kno­ chendefekte oder Verlängerungsosteotomien bereits mit Ringfixateuren extern oder auch mit einem modularen Rohrfixateursystem behandelt. Dabei werden Druck- oder Zugkräfte über Gewindestangen oder über feine Drähte auf den interfragmentären Bereich angewendet. (Boltze, W.-H.: Der Fixateur extern (Rohrsystem). AO-Bulletin 1976 Offizielles Organ der Schweizerischen Arbeitsge­ meinschaft für Osteosynthesefragen, Ilizarov, G.: Sammel­ band der Orthopädischen Gesellschaft, S. 146, 1954, Kurgan, A. Rüter, R. Brutscher: Die Behandlung ausgedehnter Kno­ chendefekte am Unterschenkel durch die Verschiebeosteo­ mie nach Ilizarov. Chirurg 59, S. 357, 1988; Umyarov. G.A.: Repositioning-elongation for infected post-traumatic leg defects. In: Advances Orthop. Surgery. Williams & Willi­ ams, Baltimore, P 58-62, 1985). Der Fixateur extern unter­ scheidet sich von den internen Osteosyntheseverfahren, in Bezug auf die Fragmentbewegungen am Frakturspalt unwesentlich (R. Hoffmann, J. McKellop, A. Sarmiento, B. Lu. Vortrag: Dreidimensionale Messung von Fragmentbe­ wegungen am Frakturspalt, 54. Jahrestagung der Deutsch­ en Gesellschaft für Unfallheilkunde, Berlin, 1990, Cun­ ningham JI. M.Evans, J. Kenwright, Measurement of frac­ ture movement in patients treated with unilateral exter­ nal skeletal fixation, J-Biomed-Eng., P 118-122, II (2), 1989).The use of the external fixator in bone treatment lung is widespread and indispensable. Because of the easier access routes and the easier appli cation, compared to the internal osteosynthesis, wins the external fixator has recently become increasingly important tung (e.g.: M. Zerna. R. Klenke, External fixator in the district hospital. Zentralbl-Chirurgie, P 1031-1040. 115 (16), 1900). With open fracture treatment is increasing mend the supply with the fixator externally as defini viewed and implemented. Furthermore, pseudoarthrosis, post-traumatic kno defects or extension osteotomies Ring fixators external or with a modular Pipe fixator system treated. It will print or Tractive forces via threaded rods or fine wires applied to the interfragmental area. (Boltze, W.-H .: The external fixator (pipe system). AO bulletin 1976 Official organ of the Swiss Arbeitsge Society for Osteosynthesis Questions, Ilizarov, G .: collective band of the Orthopedic Society, p. 146, 1954, Kurgan, A. Rüter, R. Brutscher: The treatment of extensive knots defects in the lower leg due to the sliding osteo mie to Ilizarov. Surgeon 59, p. 357, 1988; Umyarov. G.A .: Repositioning-elongation for infected post-traumatic leg defects. In: Advances Orthop. Surgery. Williams & Willi ams, Baltimore, P 58-62, 1985). The fixator external under  differs from the internal osteosynthesis processes, in relation to the fragment movements at the fracture gap insignificant (R. Hoffmann, J. McKellop, A. Sarmiento, B. Lu. Lecture: Three-dimensional measurement of fragments movements at the fracture gap, 54th annual meeting of the German en Society for Trauma Medicine, Berlin, 1990, Cun ningham JI. M. Evans, J. Kenwright, Measurement of Frac ture movement in patients treated with unilateral exter nal skeletal fixation, J-Biomed-Eng., P 118-122, II (2), 1989).

Das Prinzip der modernen Osteosynthese beruht auf den Untersuchungen von Pauwels über die kausale Histoge­ nese des Bindegewebes. (F. Pauwels.: Gesammelte Ab­ handlungen zur funktionellen Anatomie des Bewegungs­ apparates. Springer, Berlin 1965, F. Pauwels.: Atlas zur Biomechanik der gesunden und kranken Hüfte. Springer, Berlin, 1973). Knochengewebe bildet sich unter mechan­ ischer Beanspruchung (Druck- oder Zugspannungen) bei gleichzeitiger absoluten Ruhe. Auf diesen Untersuch­ ungen beruhen die Prinzipien der modernen Osteosyn­ these (M. E. Müller, M. Allgöwer, R. Schneider, H. Willen­ egger, Manual der Osteosynthese, 2. Auflage, Springer, Berlin, Heidelberg, New York, 1977). Bei der internen, operativen Stabilisierung von Frakturen findet immer eine Druckanwendung auf den Frakturspalt statt. Die interfragmentäre Druckkraft liegt bei langen Röhrenkno­ chen mit Plattenosteosynthesen z. B. bei der Tibia zwi­ schen 800-1400 N. Das entspricht einem Druck von un­ gefähr 2-3,5 N/mm2. Diese Werte betragen etwa ein Dreis­ sigstel bis ein Fünfzigstel der maximalen Druckfestigkeit von kompakten Knochen (H. Yamada, Strength of biolo­ gical materials. Williams & Williams, Baltimore 1970). In der Praxis werden diese Druckkräfte bei dem Fixateur extern nicht erreicht. Bisher läßt man den Patienten mit einem axial-dynamisierten Fixateur extern mit einem Teil seines Körpergewichts belasten.The principle of modern osteosynthesis is based on Pauwels' investigations of the causal histogenesis of the connective tissue. (F. Pauwels .: Collected treatises on the functional anatomy of the musculoskeletal system. Springer, Berlin 1965, F. Pauwels .: Atlas on the biomechanics of healthy and diseased hips. Springer, Berlin, 1973). Bone tissue forms under mechanical stress (compressive or tensile stress) with absolute rest at the same time. The principles of modern osteosynthesis are based on these examinations (ME Müller, M. Allgöwer, R. Schneider, H. Willen egger, Manual der Osteosynthese, 2nd edition, Springer, Berlin, Heidelberg, New York, 1977). When fractures are stabilized internally, pressure is always applied to the fracture gap. The interfragmentary pressure is in long Röhrenkno chen with plate osteosynthesis z. B. in the tibia between 800-1400 N. This corresponds to a pressure of un dangerous 2-3.5 N / mm 2 . These values are approximately one-third to one-fiftieth of the maximum compressive strength of compact bones (H. Yamada, Strength of biological materials. Williams & Williams, Baltimore 1970). In practice, these pressure forces are not achieved externally with the fixator. So far, the patient has been subjected to an axially dynamic fixator externally with a part of his body weight.

Kritik des Standes der TechnikCriticism of the state of the technique

Die umfassenden theoretischen Grundlagen, einschließlich der breiten praktischen Erfahrungen, finden bisher bei der Therapie mit dem Fixateur extern ungenügende An­ wendung. Zug- oder Druckkräfte werden entweder über Gewindestangen, über Zugdrähte oder nur über die Teil­ belastung durch den Patienten mit axial dynamisierten Fixateur extern auf den interfragmentären Bereich ausge­ übt. In der Frakturbehandlung mit dem Fixateur extern versucht man zwar den Frakturspalt zu komprimieren, ap­ pliziert aber nicht die Druckkräften wie z. B. bei der Plattenosteosynthese.The comprehensive theoretical foundations, including  of broad practical experience, so far found at Therapy with the external fixator is insufficient turn. Tensile or compressive forces are either over Threaded rods, over pull wires or just over the part loading by the patient with axially dynamized External fixator on the interfragmentary area practices. In fracture treatment with the external fixator one tries to compress the fracture gap, ap but not the pressure forces such. B. at the Plate osteosynthesis.

Da ferner die Steigerung der interfragmentären Druck­ kraft von der Gewichtsbelastung des Patienten abhängt, können keine konstanten interfragmentären Druckkräfte aufgebaut werden. Unachtsamkeit oder ein Ausrutschen mit plötzlicher Vollbelastung irritieren letztlich den ge­ wollten Knochenheilungsprozeß.Furthermore, since the increase in interfragmentary pressure depends on the patient's weight load, cannot have constant interfragmentary compressive forces being constructed. Inattention or slipping with sudden full load ultimately irritate the ge wanted bone healing process.

Die internen Osteosynthesen bedürfen nach Abschluß der Knochenheilung einer erneuten Operation zur Ent­ fernung des lmplantats, meist mit Narkose und stationär­ em Krankenhausaufenthalt verbunden.The internal osteosynthesis requires completion the bone healing of a new operation for ent Removal of the implant, usually with anesthesia and inpatient connected to hospitalization.

Aufgabetask

Der Erfindung liegt die Aufgabe zugrunde, die Vorteile der interfragmentären Kraftapplikation der internen Os­ teosynthese auf die externe Fixation zu übertragen. Es soll ein Fixateur extern gefunden werden, der eine kon­ stante und kontrollierte Zug- oder Druckkraft, unabhäng­ ig von der Mitarbeit des Patienten, auf den interfragmen­ tären Bereich ausübt. Die Zug- oder Druckkraft soll quan­ tifizierbar und messbar sein. Zur Ausschaltung der Beein­ flußbarkeit durch den Patienten soll z. B. die Gewichts­ belastung der betroffenen Extremität keinen Einfluß auf die interfragmentäre Kraft haben. Ferner soll durch den neuen Fixateur extern die Behandlungszeit, die statio­ näre Krankenhausverweildauer und die Arbeitsunfähig­ keit verkürzt werden. Eine Implantatentfernung soll ohne Narkose ambulant erfolgen können. Eine Gewichtsbelas­ tung soll ohne Gipsbehandlung sofort möglich sein.The invention has for its object the advantages the interfragmental force application of the internal os Transfer teosynthesis to external fixation. It an external fixator is to be found that has a con constant and controlled tensile or compressive force, independent ig from the cooperation of the patient on the interfragmen exercised in the primary area. The tensile or compressive force should be quan be quantifiable and measurable. To switch off the legs Flowability through the patient is said to B. the weight load on the affected limb has no influence that have interfragmental power. Furthermore, by the new fixator external the treatment time, the statio hospital stay and unable to work be shortened. An implant removal should be without Anesthesia can be done on an outpatient basis. A weight load Treatment should be possible immediately without plaster treatment.

Lösungsolution

Fig. 1 zeigt den erfindungsgemäßen axial-dynamisierten Fixateur extern. In der Figur bedeutet 1 das Federelement, 2 das Dämpfungselement im axial dynamisierten Fixateur extern und 3 die Kraftmeßsonde im Federelement. Fig. 1 shows the external axial fixator-dynamized invention. In the figure, 1 means the spring element, 2 the damping element in the axially dynamic fixator externally and 3 the force measuring probe in the spring element.

Diese Aufgabe wird gelöst, indem quantifizierbare, ver­ änderbare Federelemente (1) in den interfragmentären Bereich eines axial dynamisierten Fixateur externs ein­ gefügt werden und so Druck- oder Zugkräfte auf den Frakturbereich wirken können. Dabei spielt es keine Rolle, wie die Druck- oder Zugkraft aufgebaut wird. Sei es über feste, gasförmige oder flüssige Materie. Um den Belastungsdruck durch das Körpergewicht auszu­ schalten, werden die Federelemente mit Dämpfungsele­ menten (2) kombiniert. So kann der Patient z. B. das Bein sofort nach Anlage des Fixateur extern belasten, ohne daß diese Druckkraft auf den interfragmentären Bereich wirkt. Druck- oder Zugkraft-Meßsonden in den Feder­ elementen (3) quantifizieren die Kraft und lassen so eine Korrektur der Federelemente zu.This object is achieved by inserting quantifiable, changeable spring elements ( 1 ) into the interfragmentary area of an axially dynamized fixator externally, so that compressive or tensile forces can act on the fracture area. It does not matter how the pressure or tensile force is built up. Be it about solid, gaseous or liquid matter. In order to switch off the load pressure due to body weight, the spring elements are combined with damping elements ( 2 ). So the patient can e.g. B. externally load the leg immediately after the fixator is applied, without this compressive force acting on the interfragmentary area. Pressure or tensile force measuring probes in the spring elements ( 3 ) quantify the force and thus allow the spring elements to be corrected.

Erzielbare VorteileAchievable advantages

Der erfindungsgemäße axial-dynamisierte Fixateur ex­ tern mit Federelementen, mit oder ohne Kombination von Dämpfungselementen ermöglicht eine kontrollierte, quan­ tifizierbare und korrigierbare Zug- oder Druckkraftap­ plikation auf den interfragmentären Bereich. Gegenüber der internen Fixation ergibt sich der Vorteil der Kraft­ kontrolle, der Kraftkorrektur bei völliger Unabhängigkeit von der Mitarbeit des Patienten und der damit verbun­ denen Vorteile des Fixateur: Leichtere technisch-operative Implantation, keine Gipsruhigstellung, weniger Komplika­ tionen, kürzere Krankenhausverweildauer, sofortige Belast­ barkeit der betroffenen Extremität und durch den Wegfall der stationären Implantatentfernung mit einer erneuten Narkose eine kürzere Arbeitunfähigkeit, bei insgesamt geringeren Kosten. Der Fixateur extern kann wiederver­ wendet werden. Durch den völligen Wegfall der Gips­ behandlung, im Gegensatz zu den internen Osteosynthe­ sen, wird ferner weniger Abfall produziert.The axially dynamized fixator ex ters with spring elements, with or without a combination of Damping elements enables a controlled, quan tifiable and correctable tensile or compressive force tapes application to the interfragmentary area. Across from the internal fixation gives the advantage of strength control, force correction with complete independence of the cooperation of the patient and associated with it The advantages of the fixator: Lighter technical and operational Implantation, no plaster immobilization, fewer complications ward, shorter hospital stay, immediate burden availability of the affected limb and the loss  the stationary implant removal with a new one Anesthesia is a shorter incapacity to work, overall lower cost. The external fixator can be reused be applied. By completely eliminating the plaster treatment, in contrast to the internal osteosynthesis less waste is also produced.

Claims (6)

1. Fixateur extern mit axialer Dynamisierung, dadurch gekennzeichnet, daß quantifizierbare Zug- oder Druck­ kräfte auf den interfragmentären Bereich durch Feder­ elemente ausgeübt werden.1. External fixator with axial dynamization, characterized in that quantifiable tensile or compressive forces are exerted on the interfragmentary area by spring elements. 2. Fixateur extern mit axialer Dynamisierung nach An­ spruch 1, dadurch gekennzeichnet, daß die Federelemen­ te mit oder nicht mit einem Dämpfungselement kombi­ niert werden, um z. B. die Gewichtskraft des Patienten auf den interfragmentären Bereich zu neutralisieren.2. External fixator with axial dynamization according to An saying 1, characterized in that the spring elements te with or not combined with a damping element be kidneyed to z. B. the weight of the patient neutralize on the interfragmental area. 3. Fixateur extern mit axialer Dynamisierung nach An­ spruch 1 und 2, dadurch gekennzeichnet, daß die durch die Federelemente ausgeübten Zug- oder Druckkräfte variabel und/ oder quantifizierbar sind.3. External fixator with axial dynamization according to An saying 1 and 2, characterized in that the by the spring elements exerted tensile or compressive forces are variable and / or quantifiable. 4. Fixateur extern mit axialer Dynamisierung nach An­ spruch 1, 2 und 3, dadurch gekennzeichnet, daß axial zu den Federelementen und/oder Dämpfungselementen Druckmeßsonden eingebracht werden können, die die interfragfentären Zug- oder Druckkräfte messen.4. External fixator with axial dynamization according to An saying 1, 2 and 3, characterized in that axially to the spring elements and / or damping elements Pressure measuring probes can be introduced, which the Measure inter-fragmentary tensile or compressive forces. 5. Fixateur extern mit axialer Dynamisierung nach An­ spruch 1, 2, 3 und 4, dadurch gekennzeichnet, daß die axial eingebrachten Federelemente und Dämpfungsele­ mente über feste, flüssige oder gasförmige Materie Zug­ oder Druckkraft ausüben.5. External fixator with axial dynamization according to An saying 1, 2, 3 and 4, characterized in that the axially inserted spring elements and damping elements elements about solid, liquid or gaseous matter train or apply pressure. 6. Fixateur extern mit axialer Dynamisierung nach An­ spruch 1, 2, 3, 4 und 5, dadurch gekennzeichnet, daß die axial eingebrachten Feder- und Dämpfungselemente prinzipiell an jede Art von Schrauben, Stiften oder Nä­ geln befestigt werden können.6. External fixator with axial dynamization according to An saying 1, 2, 3, 4 and 5, characterized in that the axially inserted spring and damping elements in principle to any kind of screws, pins or sewing gels can be attached.
DE19914118303 1991-06-04 1991-06-04 Bone fracture therapeutical instrument - is external frame with variable and measurable pressure and traction forces Ceased DE4118303A1 (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9418153U1 (en) * 1994-02-15 1995-02-02 Effner Biomet Gmbh Device for dynamic joint fixation
DE19645392C1 (en) * 1996-11-04 1998-04-30 Joerg Dr Dr Wiltfang Traction device for bones, in two parts with in-between hydraulic cylinder
DE19753010A1 (en) * 1997-11-30 1999-06-10 Daniel Spitzer Device for adjustment of external fixation of fractured bone
DE19855254A1 (en) * 1998-11-30 2000-06-08 Richard Hans Albert Device for the retention and protection of damaged bones
DE10326828A1 (en) * 2003-06-12 2005-01-05 Spreehybrid & Kommunikationstechnik Gmbh Electronically controllable external fixation for automated treatment of bone fracture points has a controlled drive unit with an integral force measurement unit for adjustment of the joining force at the fracture point
DE102004018621A1 (en) * 2004-04-16 2005-11-10 Biedermann Motech Gmbh Elastic element e.g. for stabilizing device for bones and method of fabrication of such an elastic element, has a cylindrical body with two ends and flexible section between ends and section is made from two coil springs
US7833256B2 (en) 2004-04-16 2010-11-16 Biedermann Motech Gmbh Elastic element for the use in a stabilization device for bones and vertebrae and method for the manufacture of such elastic element
US8758343B2 (en) 2005-04-27 2014-06-24 DePuy Synthes Products, LLC Bone fixation apparatus
CN109452986A (en) * 2018-11-23 2019-03-12 山东中医药大学 A kind of method that rat femur external fixator of variable rigidity promotes the healing of II phase of fracture

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DE3229313A1 (en) * 1981-08-06 1983-02-24 National Research Development Corp., London DEVICE FOR EXTERNAL FIXING OF BROKEN BONES
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DE8815695U1 (en) * 1988-12-14 1990-01-11 Mecron Medizinische Produkte Gmbh, 1000 Berlin, De
DE3912080C1 (en) * 1989-04-13 1990-05-31 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De Healing process monitor for broken bones - uses force measurer, distance measurer for fixture screws and evaluator
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2459085A1 (en) * 1973-12-14 1975-06-26 Rischskij Nii Trawmatologii I SURGICAL COMPRESSION DISTRACTION DEVICE
DE3229313A1 (en) * 1981-08-06 1983-02-24 National Research Development Corp., London DEVICE FOR EXTERNAL FIXING OF BROKEN BONES
DE3614305A1 (en) * 1986-04-29 1987-11-12 Baehr Geb Green Judith M External fixator
DE8815695U1 (en) * 1988-12-14 1990-01-11 Mecron Medizinische Produkte Gmbh, 1000 Berlin, De
DE9002087U1 (en) * 1989-02-27 1990-06-28 Jaquet Orthopedie S.A., Plan-Les-Ouates, Ch
DE3912080C1 (en) * 1989-04-13 1990-05-31 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe, De Healing process monitor for broken bones - uses force measurer, distance measurer for fixture screws and evaluator

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9418153U1 (en) * 1994-02-15 1995-02-02 Effner Biomet Gmbh Device for dynamic joint fixation
DE19645392C1 (en) * 1996-11-04 1998-04-30 Joerg Dr Dr Wiltfang Traction device for bones, in two parts with in-between hydraulic cylinder
DE19753010A1 (en) * 1997-11-30 1999-06-10 Daniel Spitzer Device for adjustment of external fixation of fractured bone
DE19855254A1 (en) * 1998-11-30 2000-06-08 Richard Hans Albert Device for the retention and protection of damaged bones
DE19855254B4 (en) * 1998-11-30 2004-08-05 Richard, Hans-Albert, Prof. Dr. Device for the retention and protection of damaged bones
DE10326828A1 (en) * 2003-06-12 2005-01-05 Spreehybrid & Kommunikationstechnik Gmbh Electronically controllable external fixation for automated treatment of bone fracture points has a controlled drive unit with an integral force measurement unit for adjustment of the joining force at the fracture point
DE102004018621A1 (en) * 2004-04-16 2005-11-10 Biedermann Motech Gmbh Elastic element e.g. for stabilizing device for bones and method of fabrication of such an elastic element, has a cylindrical body with two ends and flexible section between ends and section is made from two coil springs
DE102004018621B4 (en) * 2004-04-16 2006-06-08 Biedermann Motech Gmbh Elastic element e.g. for stabilizing device for bones and method of fabrication of such an elastic element, has a cylindrical body with two ends and flexible section between ends and section is made from two coil springs
US7833256B2 (en) 2004-04-16 2010-11-16 Biedermann Motech Gmbh Elastic element for the use in a stabilization device for bones and vertebrae and method for the manufacture of such elastic element
US8449574B2 (en) 2004-04-16 2013-05-28 Biedermann Technologies Gmbh & Co. Kg Elastic element for the use in a stabilization device for bones and vertebrae and method for the manufacture of such elastic element
US8758343B2 (en) 2005-04-27 2014-06-24 DePuy Synthes Products, LLC Bone fixation apparatus
CN109452986A (en) * 2018-11-23 2019-03-12 山东中医药大学 A kind of method that rat femur external fixator of variable rigidity promotes the healing of II phase of fracture
CN109452986B (en) * 2018-11-23 2021-04-30 山东中医药大学 Method for promoting fracture healing in stage II by using rigidity-variable rat femur external fixator

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