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
  • A61B17/60—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
  • A61B17/6416—Devices extending alongside the bones to be positioned with non-continuous, e.g. hinged, pin-clamp connecting element
• • 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

Definitions

• the invention relates to a device for external fixation of broken bones according to the preamble of claim 1.
• a device of this type is known from DE 19746687 AI.
• the bone nails of the known device have smooth tips, the bone nails rotatably mounted in the limbs being driven into the bones using a small electric drill under particular pressure exerted by hand.
• the driven bone nail is then secured to the limb of the device to which it belongs by means of a lock nut tightened against the limb.
• a disadvantage of the known device is that the driving in of the bone nail requires a relatively high expenditure on equipment, that the bone nail must be driven relatively far into the bone because of the smooth design of its tip for secure anchoring, and that those supplied by the electric drilling machine in this procedure and also the required high speeds lead to unnecessarily severe destruction of the bone around the bone nail.
• the object of the invention is therefore to improve a device of the type mentioned at the outset in such a way that a secure anchoring of the bone nail is ensured with as little stress on the bone as possible.
• Fig. 1 is a finger attached device according to the invention for external fixation of broken bones
• Fig. 2 (a) - (d) a member of the device, which carries a screwable bone nail into the bone, in a view from the side, from behind, from above and in perspective.
• the fixing device has a chain of links 1 which, as can be seen better from FIG. 2, are connected to one another like a ball joint.
• Each link has a ball at one end and a ball socket 3 at the other end, the ball 2 of one link being received in the ball socket 3 of the next link.
• the relative position of the links which are connected to one another in a ball-and-socket manner in this way is determined by the clamping bracket 6 surrounding the ball socket, with which the ball sockets 3 which are elastically deformable by slots 11 are pressed against the balls 2 contained in them.
• bone nails of a conventional type which can be gripped on a head 4, for example with an electric drill, and after being driven into the bone, they are fixed in a torsion-proof manner with a lock nut 5 on the link in which they are located.
• a bone nail 7 embodying the invention On a link located between the ends there is a bone nail 7 embodying the invention. This is formed by a screw which has a tip with a self-tapping thread 8, comparable to a self-tapping screw or a corkscrew. When screwed into the bone, the bone nail is anchored in the bone. In this way, stability is achieved even at smaller penetration depths than with the conventional bone nail, as shown at the ends of the fixing device.
• the bone nail 7 is attached in the link 1 by means of a knurled nut 9 which is rotatably but axially fixed in the link 1.
• the bone nail 7 interacts with the knurled nut 9 via a self-locking thread 10. If you hold the knurled nut 9, which can be gripped from the outside (if necessary) by hand, and also turn the screw at the head end, if necessary with the help of a tool, the bone nail 7 moves into the bone.
• the pitch of the self-locking thread 10 corresponds approximately to that of the self-tapping thread 8. The self-locking ensures that the bone nail 7 is secured against unwanted twisting without further measures.
• the limb bearing the bone nail 7 can be adjusted in height relative to the bone.
• the self-locking of the thread ensures that the position once set does not change automatically.
• only the central bone nail is designed according to the invention, while the terminal bone nails are of a conventional type. However, it is of course also possible to design more than one bone nail and all of them in the same way as the bone nail shown in the middle in FIG. 1.

Landscapes

• Health & Medical Sciences (AREA)
• Orthopedic Medicine & Surgery (AREA)
• Life Sciences & Earth Sciences (AREA)
• Surgery (AREA)
• Biomedical Technology (AREA)
• Engineering & Computer Science (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (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)
• Surgical Instruments (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=7967618

Family Applications (1)

Country Status (7)

Families Citing this family (6)

Family Cites Families (14)

• 2002
  • 2002-02-11 DE DE20202049U patent/DE20202049U1/de not_active Expired - Lifetime
• 2003
  • 2003-02-10 US US10/504,094 patent/US20050085754A1/en not_active Abandoned
  • 2003-02-10 WO PCT/EP2003/001293 patent/WO2003068084A1/de not_active Application Discontinuation
  • 2003-02-10 EP EP03706468A patent/EP1478289A1/de not_active Withdrawn
  • 2003-02-10 CN CNB03803686XA patent/CN1301687C/zh not_active Expired - Fee Related
  • 2003-02-10 CA CA002475636A patent/CA2475636A1/en not_active Abandoned
  • 2003-02-10 AU AU2003208824A patent/AU2003208824A1/en not_active Abandoned

Non-Patent Citations (1)

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