Classifications

• • 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
  • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
  • A61B17/8085—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with pliable or malleable elements or having a mesh-like structure, e.g. small strips
• • 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
  • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
  • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
  • A61B17/7002—Longitudinal elements, e.g. rods
  • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
• • 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
  • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
  • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
  • A61B17/7002—Longitudinal elements, e.g. rods
  • A61B17/7011—Longitudinal element being non-straight, e.g. curved, angled or branched
  • A61B17/7013—Longitudinal element being non-straight, e.g. curved, angled or branched the shape of the element being adjustable before use
• • 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
  • A61B17/70—Spinal positioners or stabilisers, e.g. stabilisers comprising fluid filler in an implant
  • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
  • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass
  • A61B17/7034—Screws or hooks with U-shaped head or back through which longitudinal rods pass characterised by a lateral opening
• • 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
  • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
  • A61B17/8061—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates specially adapted for particular bones
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
  • A61F2/02—Prostheses implantable into the body
  • A61F2/28—Bones

Definitions

• the present invention is related to the field of orthopaedic implants.
• the present invention provides a bone plate which is easy to be deformed in-situ to match the natural or desired reconstructed shape of the bone surface during surgery operations.
• the bone plates in use very often need to be deformed in-situ to facilitate the complicated, often three-dimensional fracture geometries.
• US patent No. 5,746,742 discloses a bone plate template which is an easily contourable plate that is placed against a bone, and contoured using finger pressure. After it is contoured by a clinician, it is used by a technician to create a duplicate contoured bone plate for implantation.
• the template must, therefore, resemble its corresponding bone plate in all material aspects. Therefore, most templates are simply a silhouette of their corresponding bone plate.
• a primary objective of the present invention is to provide a bone plate for affixing fractured bones with the help of bone screws, and the bone plate is relatively easy to be deformed to match the natural or desired reconstructed shape of the bone surface, so that fractured bones can be reconstructed and affixed according to the shape desired by the surgeon.
• the "relatively easy” used hereinafter intends to mean that the bone plate can be deformed by the surgeon with the orthopaedic tools during the operation, and even after the bone plate has been fixed to fractured bones by bone screws, i.e. the bone plate can be deformed in-situ by the surgeon through the incision.
• Another objective of the present invention is to provide a bone plate, which is relatively easy to be shortened or lengthened.
• Still Another objective of the present invention is to provide a bone plate, which is relatively easy to be shortened, lengthened, bended, arched or twisted.
• a bone plate constructed in accordance with the present invention comprises a first elongated strip comprising a first series of repeating units, a first and a second terminal screw holes being provided at two ends of the first series of the repeating units, wherein the number of the repeating unit between the two terminal screw is about 2-20, and each repeating unit comprises two crowns, two necks, and four bridges, wherein the two crowns and the two necks are connected by the four bridges to from a ring structure, characterized in that a maximum distance between inner sides of the two crowns (ID) is greater than a width of the neck (NW), and a maximum distance between outer sides of two opposite bridges of the four bridges (OD) is greater than a unit length between two adjacent repeating units (UL), which is a distance between centers of two neighboring ring structures.
• ID inner sides of the two crowns
• NW width of the neck
• OD maximum distance between outer sides of two opposite bridges of the four bridges
• UL unit length between two adjacent repeating units
• a width of the bridge (BW) is greater than a width of the crown
• an outer side of each of the two crowns of the repeating unit is faceted.
• each of the two necks of the repeating unit is faceted.
• the bone plate of the present invention further comprises a second elongated strip with one end thereof extending or branching from the first elongated strip and with another end thereof being provided with a third terminal screw hole, wherein the second elongated strip comprises a second series of the repeating units between the first elongated strip and the third terminal screw hole. More preferably, the second elongated strip and the first elongated strip have a common longitudinal axis.
• the first elongated strip has a first longitudinal axis
• the second elongated strip has a second longitudinal axis
• the second elongated strip extends from one of the first or the second terminal screw hole with the first longitudinal axis and the second longitudinal axis forming an obtuse angle therebetween, or the first elongated strip and the second elongated strip form a shape similar to y.
• the bone plate of the present invention further comprises a second elongated strip with one end thereof extending or branching from the first elongated strip and with another end thereof being provided with a third terminal screw hole; and a third elongated strip with one end thereof extending or branching from the first elongated strip and with another end thereof being provided with a fourth terminal screw hole, wherein the second elongated strip comprises a second series of the repeating units between the first elongated strip and the third terminal screw hole, and the third elongated strip comprises a third series of the repeating units between the first elongated strip and the fourth terminal screw hole.
• the first elongated strip, the second elongated strip and the third elongated strip form a shape similar to Y, X, T, + or n.
• the first elongated strip has a thickness of about 0.1-2.5 mm, the CW is about 0.1-1.0 mm, the BW is of about 0.2-3.5 mm, the ID is of about 1-8 mm, the NW is about 0.5-5 mm, the OD is about 1.5-15 mm, and the UL is about 1-10 mm.
• the first elongated strip has a thickness of about 0.5-1.5 mm, the CW is about 0.1-0.5 mm, the BW is of about 0.2-2 mm, the ID is of about 2-4 mm, the NW is of about 1-3 mm, the OD is of about 2.5-5 mm, and the UL is of about 2-5 mm.
• the first elongated strip is made of a metal of pure titanium, titanium alloy, pure iron, iron alloy, pure magnesium, magnesium alloy, pure zinc, zinc alloy, or a composite prepared from at least two of these metals.
• the present invention further discloses a method of deforming a bone plate of the present invention, which comprises shortening the bone plate or lengthening the bone plate, wherein
• said shortening the bone plate comprises the following steps:
• said lengthening the bone plate comprises the following steps:
• the method of the present invention further comprises bending the bone plate, or twisting the bone plate, wherein
• said bending the bone plate comprises the following steps:
• said twisting the bone plate comprises the following steps:
• Fig. 1 shows an illustrated top plan view of a bone plate constructed according to one preferred embodiment of the present invention.
• Fig. 2 shows an illustrated top plan view of a bone plate constructed according to another preferred embodiment of the present invention.
• Fig. 3a shows the lengthening of the bone plate shown in Fig. 2.
• Fig. 3b shows the shortening of the bone plate shown in Fig. 2.
• Fig. 3c shows the in-plane bending of the bone plate shown in Fig. 2.
• Fig. 3d shows the out-of-plane bending of the bone plate shown in Fig. 2.
• Fig. 3e shows the twisting of the bone plate shown in Fig. 2.
• FIG. 1 A bone plate of an elongated strip 10 constructed according to one of the preferred embodiments of the present invention is shown in Fig. 1 , which has eight repeating units of a faceted ring structure 20, and two terminal screw holes 90.
• any one of the faceted ring structures between the two terminal screw holes 90 can also be used as an auxiliary screw hole.
• the elongated strip 10 may be provided with one or more terminal screws adjacent to the terminal screw hole 90, if it is required.
• Each faceted ring structure 20 is formed by two crowns 21, two necks 22, and four bridges 23 connecting the two crowns 21 to the two necks 22.
• the faceted ring structure 20 can be deformed in-situ by a mechanical force, and manipulated into a shape as desired. It is discovered that, in order to be easily manipulated as desired, the crown 21 has a crown width (CW) which is smaller (preferably smaller by at least 20%) than a bridge width (B W) of the bridge 23.
• CW crown width
• B W bridge width
• the faceted ring structure 20 should have an inner diameter (ID), i.e. a maximum distance between inner sides of the two crowns, greater (preferably greater by at least 20%) than a neck width (NW) of the neck 22.
• ID inner diameter
• NW neck width
• the elongated strip 10 of the bone plate should preferably have at least two adjacent faceted ring structures 20 having a unit length (UL) smaller (preferably smaller by at least 20%) than an outer diameter (OD) of the two adjacent faceted ring structures 2D.
• the outer diameter (OD) is a maximum distance between outer sides of two opposite bridges 23 of the faceted ring structure 20, and the unit length (UL) is a distance between centers of two neighboring symmetrical ring structures 20.
• the ID of the faceted ring structure 20 is at least 50% (preferably at least 60%) of the OD of the faceted ring structure 20 (ID >l/2 OD). More specifically, the crown width (CW) is about 0.1-1.0 mm.
• the faceted ring structure 20 has faceted and substantially flat surface A at the outer side of each of the two crowns 21.
• the faceted ring structure 20 has a ring shape but not necessarily a round shape.
• a bone plate similar to the bone plate shown in Fig. 1 and constructed according to another preferred embodiment of the present invention is shown in Fig. 2, wherein like elements or parts between the two embodiments are represented by like numerals.
• the bone plate shown in Fig. 2 is further provided with a faceted and substantially flat surface B at the inner sides of the necks 22 of the faceted ring structure 20.
• the bone plate shown in Fig. 2 has a thickness of about 1.2 mm, wherein the crown width (CW) is 0.5 mm, the width of the bridge (BW) is of 0.6 mm, the maximum distance between inner sides of the two crowns (ID) is of 2.2 mm, the width of the neck (NW) is of 2 mm, the maximum distance between the outer sides of the two opposite bridges (OD) is of 3.4 mm, and the unit length (UL) is of 2.5 mm.
• Figs. 3a to 3e The inventive in-situ deformation of the bone plate shown in Fig. 2 are shown in Figs. 3a to 3e, which includes
• the bone plate of the present invention may further comprise at least one branch/arm to facilitate fixing multiple fractures.
• the inventive bone plate can be made from any material that may facilitate the desired deformation in-situ.
• the bone plate material has an ultimate tensile strength (UTS) that is higher than its yield strength (YS) by at least 20%, preferably by at least 30%, and more preferably by at least 40%.
• the bone plate material has a tensile elongation at least 10%, preferably at least 15%, and more preferably at least 20%.
• the bone plate is made from a biocompatible, metallic material.
• the bone plate is made from a metal of pure titanium, titanium alloy, pure iron, iron alloy, pure magnesium, magnesium alloy, pure zinc, zinc alloy, or a composite prepared from at least two of these metals.
• the inventive bone plates may be fabricated using any common techniques, such as casting, rolling, machining, electrically discharge machining, laser drilling, chemical etching, pressure molding, stamping, etc.

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

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

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• 2012
  • 2012-06-25 US US13/531,710 patent/US8702763B2/en active Active
  • 2012-06-25 TW TW101122695A patent/TWI536952B/zh active
  • 2012-06-26 WO PCT/US2012/044150 patent/WO2013003319A2/en not_active Ceased
  • 2012-06-26 EP EP12804176.1A patent/EP2723257B1/en not_active Not-in-force
  • 2012-06-26 KR KR1020137034666A patent/KR101699716B1/ko not_active Expired - Fee Related
  • 2012-06-26 CN CN201280032283.7A patent/CN103687557B/zh not_active Expired - Fee Related
  • 2012-06-26 JP JP2014518905A patent/JP6329897B2/ja active Active

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