WO1997013469A1 - Connection device e.g. for bone parts - Google Patents

Connection device e.g. for bone parts Download PDF

Info

Publication number
WO1997013469A1
WO1997013469A1 PCT/GB1995/002394 GB9502394W WO9713469A1 WO 1997013469 A1 WO1997013469 A1 WO 1997013469A1 GB 9502394 W GB9502394 W GB 9502394W WO 9713469 A1 WO9713469 A1 WO 9713469A1
Authority
WO
WIPO (PCT)
Prior art keywords
connection device
shape
attachment
members
attachment locations
Prior art date
Application number
PCT/GB1995/002394
Other languages
French (fr)
Inventor
Anthony Walter Anson
Original Assignee
Anson Medical Limited
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GB9406876A priority Critical patent/GB2288122B/en
Application filed by Anson Medical Limited filed Critical Anson Medical Limited
Priority to AU36149/95A priority patent/AU3614995A/en
Priority to PCT/GB1995/002394 priority patent/WO1997013469A1/en
Publication of WO1997013469A1 publication Critical patent/WO1997013469A1/en

Links

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
    • A61B17/80—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates
    • A61B17/8004—Cortical plates, i.e. bone plates; Instruments for holding or positioning cortical plates, or for compressing bones attached to cortical plates with means for distracting or compressing the bone or bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B2017/00831—Material properties
    • A61B2017/00867—Material properties shape memory effect
    • 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
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30092—Properties of materials and coating materials using shape memory or superelastic materials, e.g. nitinol
    • 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
    • A61F2210/00—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
    • A61F2210/0014—Particular material properties of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof using shape memory or superelastic materials, e.g. nitinol

Definitions

  • This invention relates to a connection device for connecting two members, particularly for use in connecting fractured bones in animals and humans, but also of wider technical and engineering application.
  • the invention aims to provide a connection device which can provide a continued dynamic effect, in the case above a continuous pressure urging the bone together.
  • This device which may be described as a 'dynamic fish plate' because of its similarity to the connections made between each rail in a railway line, is construct ⁇ ed of a shape memory alloy material and could replace similar devices used to connect two or more separate components together and introduce a compression force to the connected parts to improve strength and rigidity of the separate members.
  • the fish plate may be attached by established fixing devices. These may be e.g. screws, bolts, studs, rivets, springs or certain fusion welding techniques.
  • a connection plate (Fig. lb) is constructed of a strip of shape memory alloy whose dimensions are 85.0mm long, 13.0mm wide and 3.0mm thick. It has four fixing holes, two at either end of the strip. It also has a slot, 3.0mm wide, 25.0mm long, machined in the central portion of the fish plate. The slot is orientated in the long axis of the strip. The slot enables the material lying at either side of this slot, to be deformed by pulling each part, in the same plane but in opposite directions. To limit excessive strain m tne deformed parts, a tool is used to ensure that the deformation does not allow stress concentrations at any specific point. The deformation is substant a ly rounded (see Fig. la) . The geometry described is to be the memorised shape .
  • the pre-memory shape of Fig. lb is however the geometry desired when the dynamic fish plate is initially at ⁇ tached to its separate member. Consequently, the Fig. la shape has to be squashed back at the same time as the member is subjected to a heat treatment ( as is known in the art ) in order to store the memorised shape.
  • the fish plate may be warmed to "recall" ts memory.
  • ts memory When th s happens, outward radial extension of the metal lying either side of the previously described slot, causes a change in the pitch relationship of the fish plate fixing holes, see Fig. la.
  • the dynamic fish plate may be used in any situation where two or more components of an appropriate geometry need to be joined together. This situation arises in human bone fractures, particularly the long bones of the arms and legs .
  • the device would be attached to the bone components using established medical fixing devices .
  • the fish plate is fixed in its pre-memory shape, the fractured bones being manipulated so that the bone ends are in intimate, firm contact.
  • the shape memory alloy will be configured so that the memory transform temperature is about 30°C. Normal body core temperature is 37°C and heat contained within the body allows the transform to take place. A compressive force is then introduced at the fracture site which assists both in strength, integrity and length of time taken to affect a suitable repair.
  • the plate need not be flat, but may be shaped to fit the member to be connected. This has the additional effect of adding stiffness.
  • the device may also be used to join more than two members, and the force applied by the coupling may in some circumstances need to be outwards.
  • Highly elastic versions of the alloy may be used to avoid cyclic and corrosion stresses, such as are commonlv found in biomedical environments.

Abstract

A connection device for connecting together, for example two or more bone parts, comprises two or more attachment locations for attachment to at least two members to be connected. The connection device is made of shape memory alloy and includes between the attachment locations a section which can be deformed and is recoverable by treatment to a memorised shape. Two members connected to the device are in this manner subjected to forces during recovery which can be useful in assisting the connection thereof.

Description

CONNECTION DEVICE E.G. FOR BONE PARTS
This invention relates to a connection device for connecting two members, particularly for use in connecting fractured bones in animals and humans, but also of wider technical and engineering application.
In orthopaedic surgery, it is common to use a stainless steel plate for holding a broken bone rigidly together while the bone knits together. The broken ends need to be forced together to aid 'knitting' and using conven¬ tional plates this depends upon applying force as the plate is bolted on. After that, no compressive force is applied.
The invention aims to provide a connection device which can provide a continued dynamic effect, in the case above a continuous pressure urging the bone together.
According to the invention, there is provided a connec¬ tion device as specified in claim 1.
This device which may be described as a 'dynamic fish plate' because of its similarity to the connections made between each rail in a railway line, is construct¬ ed of a shape memory alloy material and could replace similar devices used to connect two or more separate components together and introduce a compression force to the connected parts to improve strength and rigidity of the separate members. The fish plate may be attached by established fixing devices. These may be e.g. screws, bolts, studs, rivets, springs or certain fusion welding techniques.
The change in shape of the deformed section allows for greater movement cf the two attachment locations rela¬ tive to one another and a more even return force over r e range of deformation towards the memorised snape. Movement within the shape memory alloy is caused by warming the device to a pre-set crystalline transforma¬ tion point, (known as the As and Af point AΞ = start transform, A^ - finish of transform) . During this transformation, mechanical deformation that has been introduced to the fish plate (limited by a pre-deter¬ mined strain value) will be recovered, the fish plate returning to its original memorised shape.
An example of the device usable for orthopaedic purposes is shown in the drawings .
A connection plate (Fig. lb) is constructed of a strip of shape memory alloy whose dimensions are 85.0mm long, 13.0mm wide and 3.0mm thick. It has four fixing holes, two at either end of the strip. It also has a slot, 3.0mm wide, 25.0mm long, machined in the central portion of the fish plate. The slot is orientated in the long axis of the strip. The slot enables the material lying at either side of this slot, to be deformed by pulling each part, in the same plane but in opposite directions. To limit excessive strain m tne deformed parts, a tool is used to ensure that the deformation does not allow stress concentrations at any specific point. The deformation is substant a ly rounded (see Fig. la) . The geometry described is to be the memorised shape .
The pre-memory shape of Fig. lb is however the geometry desired when the dynamic fish plate is initially at¬ tached to its separate member. Consequently, the Fig. la shape has to be squashed back at the same time as the member is subjected to a heat treatment ( as is known in the art) in order to store the memorised shape.
Once the attachment has been achieved, the fish plate may be warmed to "recall" ts memory. When th s happens, outward radial extension of the metal lying either side of the previously described slot, causes a change in the pitch relationship of the fish plate fixing holes, see Fig. la.
The dynamic fish plate may be used in any situation where two or more components of an appropriate geometry need to be joined together. This situation arises in human bone fractures, particularly the long bones of the arms and legs . The device would be attached to the bone components using established medical fixing devices . The fish plate is fixed in its pre-memory shape, the fractured bones being manipulated so that the bone ends are in intimate, firm contact. In this application the shape memory alloy will be configured so that the memory transform temperature is about 30°C. Normal body core temperature is 37°C and heat contained within the body allows the transform to take place. A compressive force is then introduced at the fracture site which assists both in strength, integrity and length of time taken to affect a suitable repair.
It is quite feasible to scale the device, making it larger cr smaller. Orthopaedic applications would then not be limited to a specific bone size or geometry. Under these circumstances, the dynamic fish plate could be considered as a "whole body" system.
The plate need not be flat, but may be shaped to fit the member to be connected. This has the additional effect of adding stiffness. The device may also be used to join more than two members, and the force applied by the coupling may in some circumstances need to be outwards. Highly elastic versions of the alloy may be used to avoid cyclic and corrosion stresses, such as are commonlv found in biomedical environments.

Claims

Cl aims
1. A connection device including two or more attachment locations for attaching to two or more memberε to be connected, said connection device being made of shape memory alloy and including between the attachment locations a section which can be deformed and is recoverable by treatment through a change in shape thereof to a memorised shape, whereby two members connected by the device are subjected to forces as a result of said recovery.
2. A connection device according to claim l, wherein the deformable section is designed to reduce a distance between the or two of the attachment locations so as to biaε the attachment locations, and thereby two members to be connected, towards one another on recovery of the deformable section.
3. A connection device according to claim 1 or 2, wherein the device is of elongate shape and includes at least one attachment location at either end thereof, the deformable section being disposed intermediate the ends of the device.
4. A connection device according to claim Ξ , wherein the deformable section includes first and second spaced bridging members coupling the two ends of the device together and facing one another in the longitudinal directions thereof so as to provide therebetween a slot.
5. A connection device according to claim 4, wherein the ends of the slot are rounded.
6. A connection device according to claim 4 or 5 , wherein the first and second bridging members have a memory shape in which thev are deformed relative to a straight shape.
7. A connection device according to claim 6, wherein the first and second bridging members are deformable to a shape closer to a straight shape than their memory shape, thereby to increase the spacing between the attachment locations at opposing ends of the device.
8. A connection device according to any preceding claim, wherein the attachment locations include means to provide attachment of the device to members to be connected by screws, balls, studs, rivets, springs or fusion welding.
9. A connection device according to any preceding claim, wherein each attachment location includes one or more apertures passing through the device.
10. A connection device according to any preceding claim, wherein the device is designed to connect together two or more bone parts.
PCT/GB1995/002394 1994-04-07 1995-10-10 Connection device e.g. for bone parts WO1997013469A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB9406876A GB2288122B (en) 1994-04-07 1994-04-07 Connection device
AU36149/95A AU3614995A (en) 1994-04-07 1995-10-10 Connection device e.g. for bone parts
PCT/GB1995/002394 WO1997013469A1 (en) 1994-04-07 1995-10-10 Connection device e.g. for bone parts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9406876A GB2288122B (en) 1994-04-07 1994-04-07 Connection device
PCT/GB1995/002394 WO1997013469A1 (en) 1994-04-07 1995-10-10 Connection device e.g. for bone parts

Publications (1)

Publication Number Publication Date
WO1997013469A1 true WO1997013469A1 (en) 1997-04-17

Family

ID=39745390

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1995/002394 WO1997013469A1 (en) 1994-04-07 1995-10-10 Connection device e.g. for bone parts

Country Status (3)

Country Link
AU (1) AU3614995A (en)
GB (1) GB2288122B (en)
WO (1) WO1997013469A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1301689C (en) * 2003-08-08 2007-02-28 上海昕昌记忆合金科技有限公司 Shape memory axial-pressurizing encircling bone-setting plate
WO2010076427A1 (en) 2008-12-19 2010-07-08 Rdi Sarl Holding and bone synthesis device for a broken bone, made of a shape memory alloy
WO2015130609A3 (en) * 2014-02-27 2015-12-10 Biomedical Enterprises, Inc. Method and apparatus for use of a compressing plate

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2288122B (en) * 1994-04-07 1997-11-26 Univ Brunel Connection device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170990A (en) * 1977-01-28 1979-10-16 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Method for implanting and subsequently removing mechanical connecting elements from living tissue
FR2700464A1 (en) * 1992-11-13 1994-07-22 Bertholet Maurice Link piece for bony elements
RU2039530C1 (en) * 1993-07-14 1995-07-20 Научно-производственное объединение "Композит" Osteosuture clamping device
RU2040220C1 (en) * 1993-04-15 1995-07-25 Московская медицинская академия им.И.М.Сеченова Plate for carrying out osteosynthesis
GB2288122A (en) * 1994-04-07 1995-10-11 Univ Brunel Bone plate

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
US3786806A (en) * 1972-11-22 1974-01-22 A Johnson Thermoconstrictive surgical appliance
SE462137B (en) * 1988-10-18 1990-05-14 Freddy Rafael Astudillo Ley DEVICE FOR CONNECTING AN OPENING IN STERNUM
FR2668361A1 (en) * 1990-10-30 1992-04-30 Mai Christian OSTEOSYNTHESIS CLIP AND PLATE WITH SELF-RETENTIVE DYNAMIC COMPRESSION.
US5085660A (en) * 1990-11-19 1992-02-04 Lin Kwan C Innovative locking plate system
DE9104025U1 (en) * 1991-04-03 1992-07-30 Waldemar Link Gmbh & Co, 2000 Hamburg, De

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4170990A (en) * 1977-01-28 1979-10-16 Fried. Krupp Gesellschaft Mit Beschrankter Haftung Method for implanting and subsequently removing mechanical connecting elements from living tissue
FR2700464A1 (en) * 1992-11-13 1994-07-22 Bertholet Maurice Link piece for bony elements
RU2040220C1 (en) * 1993-04-15 1995-07-25 Московская медицинская академия им.И.М.Сеченова Plate for carrying out osteosynthesis
RU2039530C1 (en) * 1993-07-14 1995-07-20 Научно-производственное объединение "Композит" Osteosuture clamping device
GB2288122A (en) * 1994-04-07 1995-10-11 Univ Brunel Bone plate

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section PQ Week 9614, Derwent World Patents Index; Class P31, AN 96-137860, XP002004294 *
DATABASE WPI Section PQ Week 9615, Derwent World Patents Index; Class P31, AN 96-149536, XP002004295 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1301689C (en) * 2003-08-08 2007-02-28 上海昕昌记忆合金科技有限公司 Shape memory axial-pressurizing encircling bone-setting plate
WO2010076427A1 (en) 2008-12-19 2010-07-08 Rdi Sarl Holding and bone synthesis device for a broken bone, made of a shape memory alloy
WO2015130609A3 (en) * 2014-02-27 2015-12-10 Biomedical Enterprises, Inc. Method and apparatus for use of a compressing plate

Also Published As

Publication number Publication date
GB2288122B (en) 1997-11-26
AU3614995A (en) 1997-04-30
GB2288122A (en) 1995-10-11
GB9406876D0 (en) 1994-06-01

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