JP5999745B2 - Artificial ankle - Google Patents

Artificial ankle Download PDF

Info

Publication number
JP5999745B2
JP5999745B2 JP2009276393A JP2009276393A JP5999745B2 JP 5999745 B2 JP5999745 B2 JP 5999745B2 JP 2009276393 A JP2009276393 A JP 2009276393A JP 2009276393 A JP2009276393 A JP 2009276393A JP 5999745 B2 JP5999745 B2 JP 5999745B2
Authority
JP
Japan
Prior art keywords
talus
portion
formed
ankle joint
tibia
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
JP2009276393A
Other languages
Japanese (ja)
Other versions
JP2011115440A (en
Inventor
中村 孝志
孝志 中村
宣 伊藤
宣 伊藤
孝一 藏本
孝一 藏本
広幸 高橋
広幸 高橋
義裕 野山
義裕 野山
Original Assignee
帝人ナカシマメディカル株式会社
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
Application filed by 帝人ナカシマメディカル株式会社 filed Critical 帝人ナカシマメディカル株式会社
Priority to JP2009276393A priority Critical patent/JP5999745B2/en
Publication of JP2011115440A publication Critical patent/JP2011115440A/en
Application granted granted Critical
Publication of JP5999745B2 publication Critical patent/JP5999745B2/en
Application status is Active legal-status Critical
Anticipated expiration legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2/42Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes
    • A61F2/4202Joints for wrists or ankles; for hands, e.g. fingers; for feet, e.g. toes for ankles
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS 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
    • A61F2/00Filters 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
    • A61F2/02Prostheses implantable into the body
    • A61F2/30Joints
    • A61F2002/30001Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof

Description

  The present invention relates to an artificial ankle joint.

  When the ankle joint located between the distal end of the tibia and the talus is severely damaged due to osteoarthritis or rheumatoid arthritis, it is replaced with an artificial ankle joint like other joints . However, since the ankle joint is a load joint that takes up most of its weight, it will loosen and sink if it is not replaced with an optimally sized artificial joint in accordance with the degree of damage to the talus and the skeleton. In addition, since both rolling and sliding are required under a high load, the artificial ankle joint is required to have a specific function.

The artificial ankle joints currently in use are as follows. One of them is a talus component that is mounted on the talus by providing a cylindrical part having a curvature in the front-rear direction as shown in the following Patent Document 1, and is slidable in the front-rear direction on the cylindrical part. Can also be translated in the left-right direction, and is called a cylindrical type comprising tibial components attached to the tibia. The ankle joints share these movements because the talus and tibia must be able to flex and extend in the front and rear and left and right directions. However, excessive movement in the left-right direction may cause dislocation.

  For this reason, Patent Document 2 below proposes a conical type in which the movement in the left-right direction is limited and only the sliding movement in the front-rear direction is performed. However, in this case, the movement is excessively constrained, and it is feared that after the replacement, excessive stress is applied to the prosthetic joint installation part and loosening occurs.

  Therefore, in Patent Document 3 below, a polyethylene insert is interposed between the tibial component and the talus component to restrict the lateral movement of the polyethylene insert, and to allow a certain degree of plane rotation and forward / backward movement of the tibial component with respect to the polyethylene insert. However, there are proposals to regulate when a certain limit is exceeded. As a result, the above-mentioned problems have been solved. However, the fixation of the talus component and the talus is only performed by protruding the stem on the lower surface of the talus component and embedding it.

Japanese Patent Publication No. 50-43136 Japanese Utility Model Publication No. 62-32021 Japanese Patent Laid-Open No. 2002-32021

  According to the present invention, it is possible to select the optimum length and thickness of the talus stem according to the patient's skeleton, and to enhance the fixation on the talus side.

Under the above problems, the present invention provides an artificial ankle joint provided between the distal end of the tibia and the proximal end of the spherical talus according to claim 1. However, in order from the tibia side, the upper surface has a flat plate shape, and a flange with the front and back ends folded upward to reliably receive the cortical bone before and after the distal end of the flatly cut tibia And a tibial stem that projects into the tibia is protruded, and a tibial component having a convex portion formed on the lower surface and a concave portion into which the convex portion is fitted are formed at the center of the upper surface, so that the tibial component is slightly rotated and On the upper surface of the plate-like part formed by bending back and forth along the shape of the proximal end of the talus with a polyethylene insert having a downward protrusion extending in the front and back at the center of the bottom and allowing lateral movement In the groove provided in the recess It consists of a talus component that can be inserted and slid back and forth, and prevents it from falling off to the left and right. Is formed of a base portion that is directly below the polyethylene insert and extends to the vicinity of the rear end of the polyethylene insert, and a tail portion that is fitted and fixed to the base portion, and a rib is formed across the base portion and the bottom surface of the tibial component. A characteristic artificial ankle joint is provided.

In addition, in this ankle joint, the means described in claim 2 is provided with a plurality of fins formed along the axial direction on the outer periphery of the tail.

  According to the invention of claim 1, the talus stem to be mounted on the talus component can be selected to have an optimal length and thickness according to the patient's skeleton, and the fixation on the talus side can be strengthened. In addition, the talus stem can simultaneously fix the talus and the ribs, and even with a weakly strong talus, good fixation over a long period of time can be obtained.

  According to the means of claim 2, the fixing force of the tail is further strengthened, and according to the means of claim 3, the cortical bone before and after the tibia can be always placed on the tibial component, and the tibial subsidence can be prevented. .

It is a perspective view of an artificial ankle joint. FIG. 5 is a perspective view of the talar component. FIG. 6 is a perspective view of a tibial component and a polyethylene insert. It is a side view of the state which mounted | wore the artificial ankle joint. It is a rear view in the state where an artificial ankle joint is attached. It is a partial cross section side view of the state which mounted | wore the artificial ankle joint.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a perspective view of an artificial ankle joint according to the present invention, FIG. 2 is a perspective view of a talar component, FIG. 3 is a perspective view of a tibial component and a polyethylene insert, and FIG. 4 is a side view of a state in which the artificial ankle joint is mounted. 5 is a rear view, and FIG. 6 is a partially sectional side view of a state in which an artificial ankle joint is mounted. In the ankle joint, a tibia 2 is placed on the talus 1, and a joint is formed by a joint surface between the two. Is. In the artificial ankle joint according to the present invention, a talus component 3 and a talus stem 7 integrally attached to the proximal end of the talus 1 are mounted, and a tibial component 5 is placed on the distal end of the tibia 2 with a polyethylene insert 4 interposed therebetween. These four components constitute an artificial ankle joint.

  Since the proximal end of the talus 1 has a convex spherical surface, the talus component 3 has a plate-like portion 6 that is curved to the front, back, left, and right according to this spherical surface. Attach to the end surface. In addition, since the recessed groove part 6a extended in the front-back direction is formed in the center of the plate-shaped part 6, the whole is wavy in this shape. Along with this, the proximal end of the talus 1 is also osteotomized and shaped so that the groove 6 a fits in, thereby preventing the talus component 3 from falling off the left and right with respect to the talus 1.

A base portion 8 of the talus stem protrudes obliquely rearward from the lower surface of the plate-like portion 6, and the talus stem 7 is structured to be attached to the protrusion. The talus stem 7 according to the present invention has a tail 9 which is connected to the base 8 of the talus stem. In this example, a screw hole 8a is formed in the base 8 of the talus stem.
The screw portion 9a that can be screwed into the screw hole 8a is formed at the tip of the tail portion 9; however, the present invention is not limited to this. Any material that is firmly bonded may be used.

In this example, a convex taper portion 9b is formed at the rear portion of the screw portion 9a, and a concave taper portion 8b is formed on the front side of the screw hole 8a of the base portion 8, so that both tapers can be firmly fitted. . In addition, several fins 10 are formed in the outer periphery of the tail portion 9 along the axial direction, and ribs 11 are stretched between the acute angle side of the base portion 8 and the lower surface of the talar component 3 (the lower surface of the tail portion 9). Both sides are open). This is to prevent the talar component 3 from rotating and loosening with respect to the talar 1 and sinking.

  Thus, when the talus component 3 with the talus stem 7 is attached to the talus 1, the lower surface of the talus component 3 is in close contact with the proximal end of the talus 1 and the talus stem 7 is inserted deeply into the talus 1. At this time, since the tail portion 9 can be attached to and detached from the base portion 8, the skeleton of the patient's talus 1 can be examined in advance, and the tail portion 9 that does not cause loosening or sinking of the talus component 3 can be selected. In this case, length and thickness can be considered as selection elements. It is preferable to insert the talus stem 7 through the talus 1 and into the radius 12 in order to enhance fixation.

  The polyethylene insert 4 has a lower protrusion 13 that fits into the groove 6 a while the lower surface follows the curved surface of the plate-like portion 6 of the talar component 3, so that the polyethylene insert 4 is in relation to the talar component 3. Can slide back and forth. The upper surface has a substantially flat plate shape, and an elongated recess 14 extending in the front-rear direction is formed at the center.

The tibial component 5 has a flat plate shape whose lower surface is placed on the upper surface of the polyethylene insert 4. A tibial stem 15 that projects into the tibia 2 protrudes from the upper surface, and a convex portion 16 that fits into the concave portion 14 of the polyethylene insert 4 is formed on the lower surface. The left and right width of the convex portion 16 is slightly narrower than the left and right width of the concave portion 14 of the polyethylene insert 4, and the tibial component 5 is allowed to be slightly rotated and moved left and right with respect to the polyethylene insert 4. ing.

  Further, the front and rear ends are folded upward and formed on the flange 17. The tibial component 5 is a device in which the distal end of the tibia 2 is cut flatly and mounted thereon. At this time, the front and rear flanges 17 receive the tibia 2 during this time, Cortical bone can always be placed on the tibial component 5. This is an important requirement for preventing the tibia 2 from sinking.

  As described above, when the ankle joint having the talus 1 and the tibia 2 as elements is replaced with such an artificial ankle joint, the talus 1 and the tibia 2 are slightly slid in the front-rear direction (bottom dorsiflexion). Lateral movement and rotation are also possible, and movement close to a living ankle joint can be realized.

In order to smoothly more motion, but talar component 3 and the tibial component 5 material suitable such metal or ceramic biocompatible (in this example employs a Co-Cr-Mo alloy, to without limitation), polyethylene insert 4 is highly wear-resistant ultra high molecular weight polyethylene is suitable.




  The advantage that an artificial ankle joint is composed of these four components is, first of all, when it cannot be optimally set for some reason at the time of surgery, or when it has become familiar with the living body after surgery and has come different from the first set However, there is an advantage that this shift is absorbed by the four components, particularly the polyethylene insert 4 and does not lead to an incompatible state. Secondly, in addition to forward / backward rotation, slight left / right movement and rotation are possible, allowing movement close to a living ankle joint, and this movement is the cooperation of four components. It has a characteristic that it becomes smoother and does not place an excessive burden on the ligaments and tendons.

Reference Signs List 1 talus 2 tibia 3 talus component 4 polyethylene insert 5 tibial component 6 板 plate
6a 溝 groove portion 7 talus stem 8 talus stem base portion 8a basal screw hole 8b concave taper portion 9 talus stem tail portion 9a tail screw portion 9b convex taper portion 10 fin 11 rib 12 rib 13 downward projecting portion 14 polyethylene insert Recessed portion 15 Tibial component tibial stem 16 Tibial component convex portion 17 Tibial component flange



Claims (2)

  1. In the artificial ankle joint provided between the distal end of the tibia and the proximal end of the spherical talus, the artificial ankle joint has a flat upper surface in order from the tibia side, In order to reliably receive the cortical bone before and after the distal end of the tibia that has been flattened, a flange with the front and back ends turned upward is formed, and a tibial stem that projects into the tibia is protruded. A tibial component with a convex portion formed on the lower surface and a concave portion into which the convex portion is fitted are formed at the center of the upper surface to allow some rotation and left-right movement of the tibial component, and a downward projecting portion that extends back and forth at the center of the bottom surface. A polyethylene insert having a downward protrusion and a groove provided in a top surface of a plate-like portion formed by bending back and forth along the shape of the proximal end of the talar, and slidable back and forth; and , Drop off to the left and right Consists of a tool talar component, the talus to the lower surface of the talus Component with projecting the talar stem to be inserted obliquely rearward over the calcaneus, to the vicinity of the rear end of the polyethylene insert talus stem exists immediately below the polyethylene insert An artificial ankle joint comprising an extending base portion and a tail portion fitted and fixed to the base portion, wherein a rib is formed across the base portion and the bottom surface of the tibial component.
  2. The artificial ankle joint according to claim 1, wherein a plurality of fins are formed along an axial direction on an outer periphery of the tail portion.
JP2009276393A 2009-12-04 2009-12-04 Artificial ankle Active JP5999745B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009276393A JP5999745B2 (en) 2009-12-04 2009-12-04 Artificial ankle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009276393A JP5999745B2 (en) 2009-12-04 2009-12-04 Artificial ankle

Publications (2)

Publication Number Publication Date
JP2011115440A JP2011115440A (en) 2011-06-16
JP5999745B2 true JP5999745B2 (en) 2016-09-28

Family

ID=44281494

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009276393A Active JP5999745B2 (en) 2009-12-04 2009-12-04 Artificial ankle

Country Status (1)

Country Link
JP (1) JP5999745B2 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2515391C1 (en) * 2013-01-30 2014-05-10 Общество с ограниченной ответственностью "Медико-инженерный центр сплавов с памятью формы" Calcaneal implant
JP2015521951A (en) * 2014-03-25 2015-08-03 ライト メディカル テクノロジー インコーポレイテッドWright Medical Technology, Inc. Orthodontic implant reinforcements, systems, and methods
CA2889245C (en) * 2014-11-07 2018-05-01 Kian-Ming Wong Talar dome fixation stem
US10426494B2 (en) 2017-08-24 2019-10-01 Limacorporate S.P.A. Ankle arthroplasty systems and methods
WO2019040865A1 (en) * 2017-08-24 2019-02-28 Charles Saltzman Ankle arthroplasty systems and methods
US10314597B2 (en) 2017-08-24 2019-06-11 Limacorporate S.P.A. Ankle arthroplasty systems and methods

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6673116B2 (en) * 1999-10-22 2004-01-06 Mark A. Reiley Intramedullary guidance systems and methods for installing ankle replacement prostheses
EP1861047B1 (en) * 2005-03-14 2017-05-31 Inbone Acquisition Corp. Ankle replacement system

Also Published As

Publication number Publication date
JP2011115440A (en) 2011-06-16

Similar Documents

Publication Publication Date Title
US5702477A (en) Acetabular shell with supplemental support and method
JP4463110B2 (en) Intervertebral implant, intervertebral implant insertion instrument and insertion method
US9668874B2 (en) Facet joint replacement
ES2363936T3 (en) Prosthesis of doll.
ES2456337T3 (en) Knee prosthesis
CA2478842C (en) Dynamic intervertebral implant
KR101382550B1 (en) Bone anchors having two or more potions exhibiting different performance characteristics and methods of forming the same
CA1277453C (en) Fixation device for a ligament or tendon prosthesis
US7678152B2 (en) Artificial knee joint
US5609646A (en) Acetabular cup for a total hip prosthesis
US7169150B2 (en) Non-metallic orthopedic plate
EP1589909B1 (en) Intervertebral implant
DE60034893T2 (en) Rolling spine implant
US8801789B2 (en) Two-component artificial disc replacements
US4964865A (en) Glenoid prosthesis and method of use
US6682565B1 (en) Joint prosthesis
JP4001859B2 (en) Intervertebral joint arthroplasty device
DE60303749T2 (en) humerusschulterprothese
CA2466661C (en) Posterior vertebral joint prosthesis
JP4283075B2 (en) Providing method and kit for joint part, cue stick, shoulder arthroplasty
ES2534653T3 (en) orthopedic prostheses
CA1296138C (en) Metatarsal-phalangeal replacement joint
ES2420989T3 (en) Implant to stabilize bones or vertebrae
US5658347A (en) Acetabular cup with keel
CN1267069C (en) Prosthetic knee joint

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20121122

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20131028

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20131030

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20131228

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140501

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20141003

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20150102

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20150114

A912 Removal of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A912

Effective date: 20150320

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160613

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20160705

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20160825

R150 Certificate of patent or registration of utility model

Ref document number: 5999745

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250