Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
  • A61B17/86—Pins or screws or threaded wires; nuts therefor
  • A61B17/8645—Headless screws, e.g. ligament interference screws
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
  • A61B17/84—Fasteners therefor or fasteners being internal fixation devices
  • A61B17/86—Pins or screws or threaded wires; nuts therefor
  • A61B17/8605—Heads, i.e. proximal ends projecting from bone
  • A61B17/861—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver
  • A61B17/862—Heads, i.e. proximal ends projecting from bone specially shaped for gripping driver at the periphery of the screw head
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
  • A61B17/8875—Screwdrivers, spanners or wrenches
  • A61B17/8877—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit
  • A61B17/8883—Screwdrivers, spanners or wrenches characterised by the cross-section of the driver bit the driver bit acting on the periphery of the screw head
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
  • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
  • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
  • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
  • A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
  • A61B17/8875—Screwdrivers, spanners or wrenches
  • A61B17/8886—Screwdrivers, spanners or wrenches holding the screw head
  • A61B17/8891—Screwdrivers, spanners or wrenches holding the screw head at its periphery

Definitions

• the present invention relates to screw-screwdriver systems for bone medium.
• the Practitioner realizes a pilot hole of a depth at least equal to the height of the head of the screw. But it is then limited to this depth and, in the case where, for example after verification by radiography, it turns out that this depth is considered insufficient, it is obliged to repeat the entire implantation process after removing the screw.
• the main object of the present invention is to provide a bone screw-screwdriver system which does not have the disadvantage of similar systems known from the prior art and which facilitates the work of orthopedic surgeons to place bone screws so that their proximal end is, according to their wishes, relatively far from the surface of the skin, while having a simpler structure that contributes to the reduction of the cost of such a system and that of surgical interventions.
• the subject of the present invention is a screw-screwdriver system for bone medium Mo, as defined in appended claim 1.
• Figures 1 to 5 show an embodiment of the screw-screwdriver system for bone medium according to the invention, Figures 1 & 3 to 5 being longitudinal sectional views of the system in four configurations taken in use, Figure 2 being a cross-sectional view of the system referenced in FIG. 1, and
• FIG. 6 represents a perspective view in another embodiment of the bone screw-screwdriver system according to the invention in a configuration that can functionally be comparable to that of FIG. 5.
• the invention relates to a screw-screwdriver system for applications in bone medium Mo, such as those mentioned in the preamble of the present description.
• the screw-screwdriver system according to the invention for bone medium Mo comprises a screw 10 defining a screw axis 12 and having two contiguous coaxial parts, namely: a proximal portion 13 and a distal portion 14, the proximal portion 13 having a section of polygonal shape, the distal portion 14 comprising a first thread 15-1, the nominal diameter at the top of the first thread having a value Sfv and the nominal diameter at the bottom of this first thread having a value Ffv.
• a screwdriver 20 essentially comprising a handle, a screwdriver rod 21 and coupling means for coupling the screw 10 with the screwdriver rod 21.
• the screwdriver rod whose one end is integral with the handle is defined along an axis of rotation 22 and its maximum transverse dimension has a value at most equal to Sfv, preferably equal to Ffv.
• the coupling means comprise an orifice 23 made in the screwdriver shaft 21 coaxially with the axis of rotation 22 and opening at least at the free end of the screwdriver shaft.
• this orifice 23 has a polygonal section substantially complementary to that of the proximal portion 13 of the screw 10 and the coupling means are arranged so that, when the screw 10 and the screwdriver rod 21 are coupled, the axes of screwing 12 and rotation 22 are substantially merged, and that the proximal portion 13 of the screw and the screwdriver rod 21 have relative to each other a degree of freedom in translation but no degree of freedom in rotation.
• a portion of the free end of the screwdriver rod 21 is substantially substantially conical truncated cone 24 substantially in the manner of a bevel, the small base 25 of the truncated cone being located on the face of this free end and has a diameter of a value at most equal to Sfv, preferably at most equal to Ffv, emphasizing that the value of the angel at the top of this truncated cone can be very small.
• the small base 25 of the truncated cone has a diameter of value at most equal to Sfv, and even more preferably, a diameter of value equal to Ffv.
• the proximal portion 13 of the screw 10 further comprises a second thread 15-2, FIG. 6, the nominal diameter at the top of this second thread having a value Sfv, the polygonal shape of this proximal portion 13 being obtained , in this embodiment, by at least one flat part 27, 28 made in at least this second thread 15-2.
• this second thread 15-2 is identical to the first thread 15-1, these first and second threads being furthermore made so that they are continuously screwed to one another.
• the bone screw-screwdriver system Mo comprises a screw 10 defining a screw axis 12 and comprising two coaxial contiguous parts, respectively a proximal portion 13 and a distal portion 14, the proximal portion 13 having a polygonal section, the distal portion 14 including a first thread 15-1 whose nominal diameter at the thread tip has a value Sfv and whose nominal diameter at the bottom of the thread has a value Ffv, a screwdriver 20 comprising a handle, a screwdriver rod 21 integral, at one of its ends, with the handle, this screwdriver rod being defined along an axis of rotation 22 and its maximum transverse dimension having a value at most equal to Sfv , and means for coupling the screw 10 with the screwdriver shaft 21, these coupling means comprising an orifice 23 made in
• the free end of the screwdriver rod 21 has a diameter of value at most equal to Ffv, preferably equal, and the orifice 23 consists of a slot 40 passing through the free end of the screwdriver rod 21 opening on the lateral surface of this free end.
• the system further comprises means for maintaining coaxial axes of rotation 22 and screwing 12 when the screwdriver rod 21 and the screw 10 are translatable relative to each other when they are both subjected to a rotational movement for screwing screw 10 into the bone medium Mo.
• These holding means may be of different shapes but, quite advantageously, they consist of a pin Br, of course with a diameter much smaller than Ffv, which is integral with the free end of the rod.
• the pin Br is furthermore integral with the free end of the screwdriver rod 21 so that its axis and the screwing and rotation axes 22 and 22 are coaxial so that the pin is able to be plugged into the breakthrough made in FIG. screw 10 when screwing the latter into the bone medium Mo and so that it can slide in this breakthrough.
• This pin also has the role of guiding the screw during its introduction and its screwing into the bone, thus allowing the practitioner to be certain that it will certainly play its role of liaison between, for example, two portions fractured bone.
• the screwdriver 20 is disposable, for example made of one of the following materials: metal material, plastic material.
• the screw-driver system according to the invention operates and is used as described below with reference to FIGS. 1 to 6, more particularly in its embodiment according to FIG.
• the screw 10 enters the bone medium Mo by making a self-tapping breakthrough and the small base 25 approaches the face Mof of this middle Mo up against it, figure 3.
• the free end of the screwdriver rod 21 is shaped cone frustum 24, after being abutted against the face Mof of the bone medium, this end penetrates slightly into the bone medium by performing a milling, figure 4 and 5, the depth of this milling being a function of the angle at the top of the truncated cone.
• edges 41, 42 of the slot 40 favor the realization of this milling, acting in the bone medium Mo such as "knives” or a conical end a drill bit.
• the Practitioner is certain that the free end of the proximal portion 13 of the screw is in the bone medium Mo and removed from the face Mof of this bone medium, FIG. 5 in accordance with the aims of the invention set forth in the preamble of the present description.
• the value of the withdrawal of the free end of the proximal portion 13 of the screw is a function in particular of the value of the vertex angle of the truncated cone and the friability of the bone medium.
• the practitioner will therefore choose, in a range of screwdriver rods according to the invention that he will have at his disposal, the one that has the truncated cone adapted to obtain the desired result. .

Landscapes

• 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)
• Neurology (AREA)
• Surgical Instruments (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=53269614

Family Applications (1)

Country Status (3)

Family Cites Families (8)

• 2015
  • 2015-04-13 FR FR1500754A patent/FR3034647A1/fr not_active Withdrawn
• 2016
  • 2016-03-18 EP EP16718387.0A patent/EP3282985A1/de not_active Withdrawn
  • 2016-03-18 WO PCT/FR2016/000052 patent/WO2016166423A1/fr active Application Filing

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