NL9200070A - JOINT PROSTHESIS. - Google Patents
JOINT PROSTHESIS. Download PDFInfo
- Publication number
- NL9200070A NL9200070A NL9200070A NL9200070A NL9200070A NL 9200070 A NL9200070 A NL 9200070A NL 9200070 A NL9200070 A NL 9200070A NL 9200070 A NL9200070 A NL 9200070A NL 9200070 A NL9200070 A NL 9200070A
- Authority
- NL
- Netherlands
- Prior art keywords
- cup
- spacers
- shaped element
- joint
- anchoring part
- Prior art date
Links
- 125000006850 spacer group Chemical group 0.000 claims description 24
- 238000004873 anchoring Methods 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 13
- 239000004568 cement Substances 0.000 claims description 10
- 210000000988 bone and bone Anatomy 0.000 claims description 7
- 230000003716 rejuvenation Effects 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 4
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 3
- -1 polyethylene Polymers 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims 1
- 210000003127 knee Anatomy 0.000 claims 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- 239000002184 metal Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 210000001624 hip Anatomy 0.000 description 2
- 210000000629 knee joint Anatomy 0.000 description 2
- 210000002414 leg Anatomy 0.000 description 2
- 210000000689 upper leg Anatomy 0.000 description 2
- 210000000588 acetabulum Anatomy 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- 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
- A61F2/30721—Accessories
- A61F2/30724—Spacers for centering an implant in a bone cavity, e.g. in a cement-receiving cavity
-
- 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
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
-
- 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
- A61F2/40—Joints for shoulders
- A61F2/4081—Glenoid components, e.g. cups
-
- 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
- A61F2/38—Joints for elbows or knees
-
- 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
- A61F2002/30004—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis
- A61F2002/30016—Material related properties of the prosthesis or of a coating on the prosthesis the prosthesis being made from materials having different values of a given property at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
-
- 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
- A61F2002/30108—Shapes
- A61F2002/30199—Three-dimensional shapes
- A61F2002/30224—Three-dimensional shapes cylindrical
-
- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30795—Blind bores, e.g. of circular cross-section
-
- 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
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30878—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with non-sharp protrusions, for instance contacting the bone for anchoring, e.g. keels, pegs, pins, posts, shanks, stems, struts
- A61F2002/30891—Plurality of protrusions
- A61F2002/30894—Plurality of protrusions inclined obliquely with respect to each other
-
- 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
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
- A61F2002/3412—Acetabular cups with pins or protrusions, e.g. non-sharp pins or protrusions projecting from a shell surface
-
- 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
- A61F2/46—Special tools for implanting artificial joints
- A61F2002/4631—Special tools for implanting artificial joints the prosthesis being specially adapted for being cemented
-
- 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
- A61F2230/00—Geometry of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2230/0063—Three-dimensional shapes
- A61F2230/0069—Three-dimensional shapes cylindrical
-
- 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
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0019—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in hardness, e.g. Vickers, Shore, Brinell
-
- 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
- A61F2310/00—Prostheses classified in A61F2/28 or A61F2/30 - A61F2/44 being constructed from or coated with a particular material
- A61F2310/00005—The prosthesis being constructed from a particular material
- A61F2310/00353—Bone cement, e.g. polymethylmethacrylate or PMMA
Landscapes
- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Cardiology (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Transplantation (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
Description
GewrichtsprotheseJoint prosthesis
De uitvinding heeft betrekking op een gewrichtsprothese voor bijvoorbeeld knie- of heupgewricht, bestaande uit een gewelfd, bijvoorbeeld komvormig element voor samenwerking met een ander element van het gewricht, welk gewelfd element door middel van een cementlaag in een uitsparing van het bot te bevestigen is, en dat aan de cementzijde is voorzien van afstandorganen die op het buitenoppervlak van het element uitsteken.The invention relates to a joint prosthesis for, for example, a knee or hip joint, consisting of a curved, for instance cup-shaped element for cooperation with another element of the joint, which curved element can be fixed in a recess of the bone by means of a cement layer, and that on the cement side is provided with spacers projecting on the outer surface of the element.
Een dergelijke gewrichtsprothese, bij een heup ook wel genoemd een "acetabulumcup" dient als vervanging van het natuurlijke gewricht, waartoe het bot op passende wijze wordt uitgehold, wordt bedekt met een laag cement waarna het komvormige element in het nog niet uitgeharde cement wordt gedrukt. De afstandhouders aan de buitenzijde verzorgen de juiste afstand tussen het element en het daaronder liggende bot, en verzorgen tevens de definitieve hechting met het cement nadat dit is uitgehard.Such a joint prosthesis, also referred to as an "acetabulum cup" in a hip, replaces the natural joint, for which the bone is appropriately hollowed out, is covered with a layer of cement, after which the cup-shaped element is pressed into the not yet hardened cement. The spacers on the outside provide the correct distance between the element and the bone underneath, and also provide the final bond with the cement after it has cured.
Bekende acetabulumcups zijn ondermeer beschreven in Amerikaanse octrooi 4 566 138. Dergelijke cups bestaan uit een lichaam van kunststofmateriaal, dat aan de buitenzijde is bedekt met een metaallaag. De afstandorganen zijn door middel van ultrasoon lassen op deze metaallaag bevestigd. De afstandsorganen zijn vervaardigd uit acrylmateriaal, bij-voorkeur polymethylmethacrylaat (ΡΜΜΆ) waarmee een goede hechting van het acrylcement wordt verkregen.Known acetabular cups are described, inter alia, in US patent 4 566 138. Such cups consist of a body of plastic material, which is covered on the outside with a metal layer. The spacers are attached to this metal layer by ultrasonic welding. The spacers are made of acrylic material, preferably polymethyl methacrylate (ΡΜΜΆ), with which good adhesion of the acrylic cement is obtained.
De uitvinding beoogt de bevestiging tussen de afstand-houders en het komvormige element te verbeteren, waarmee de metalen deklaag bij afstandsorganen van acrylmateriaal kan worden vermeden.The object of the invention is to improve the attachment between the spacers and the cup-shaped element, with which the metal covering layer can be avoided at spacers of acrylic material.
De prothese volgens de uitvinding onderscheidt zich doordat elk afstandorgaan een cilindrisch verankeringsdeel heeft, waarop een verjongd deel aansluit, waarmee het komvormige element is voorzien van telkens een blinde boring waarvan de diepte groter is dan de lengte van het veranke-ringsdeel en waarvan de diameter geschikt is voor het vormen van een perspassing met het verankeringsdeel.The prosthesis according to the invention is distinguished in that each spacer has a cylindrical anchoring part, to which a rejuvenated part connects, with which the cup-shaped element is each provided with a blind bore, the depth of which is greater than the length of the anchoring part and whose diameter is suitable is to form a press fit with the anchoring part.
Dankzij het gebruik van een perspassing is de montage van de afstandhouder in het komvormige element uitermate simpel en goedkoop. Vanwege het feit dat het verankeringsorgaan geheel in de blinde boring wordt gebracht, zal door de elasticiteit van het materiaal van het komvormige element het verankeringsorgaan in meer of mindere mate worden omvat, zodat een vormsluitende verbinding tot stand komt.Thanks to the use of a press fit, the mounting of the spacer in the cup-shaped element is extremely simple and inexpensive. Due to the fact that the anchoring member is fully inserted into the blind bore, the elasticity of the material of the cup-shaped element means that the anchoring member will be included to a greater or lesser extent, so that a form-fitting connection is established.
Dit effect wordt verbeterd door de hardheid van het materiaal van de afstandorganen groter te houden dan die van het materiaal van het komvormige element.This effect is enhanced by keeping the hardness of the spacer material greater than that of the cup element material.
Bovengenoemde en andere kenmerken van de uitvinding zullen nader worden toegelicht in de hieronder staande figuurbeschrijving van een uitvoeringsvoorbeeld. In de tekening toont: figuur 1 een perspectivisch aanzicht van een komvormig element voorzien van afstandorganen volgens de uitvinding; figuur 2 een doorsnede van een botdeel met daarin aangebracht een komvormig element volgens de uitvinding; figuur 3 een doorsnede door een afstandorgaan en het komvormige element op vergrote schaal.Above mentioned and other features of the invention will be further elucidated in the figure description below of an exemplary embodiment. In the drawing: figure 1 shows a perspective view of a cup-shaped element provided with spacers according to the invention; figure 2 shows a cross-section of a bone part with a cup-shaped element according to the invention arranged therein; figure 3 shows a cross-section through a spacer and the cup-shaped element on an enlarged scale.
In de figuren is met het cijfer 1 het komvormige element aangegeven, dat in de getoonde uitvoeringsvorm een bolvormige gestalte heeft, met een naar buiten wijzende flens 2 aan de open buitenrand daarvan. In het komvormige lichaam is een holte 3 uitgespaard, waarin het contra-element van het gewricht kan worden opgenomen. Dit contra-element kan bijvoorbeeld het bolvormig einddeel van het met het dijbeen verbonden heupprothese zijn, maar kan anderzijds een hotel ement zijn dat verbonden is aan het dijbeen aan de kniege-wrichtszijde, terwijl het gewelfde element 1 aan de bovenzijde van het onderbeen is bevestigd.In the figures, numeral 1 designates the cup-shaped element, which in the embodiment shown has a spherical shape, with an outwardly pointing flange 2 on the open outer edge thereof. A cavity 3 is recessed in the cup-shaped body, in which the counter-element of the joint can be received. This counter-element can for instance be the spherical end part of the hip prosthesis connected to the thigh, but on the other hand it can be a hotel element which is connected to the thigh on the knee-joint side, while the curved element 1 is attached to the top of the lower leg. .
Het komvormige element dient te worden opgenomen in de bestaande holte van het bot B (zie figuur 2), dat al of niet op passende wijze wordt uitgeschraapt voor het verkrijgen van de juiste afmeting. Tussen het komvormige element 1 en het been wordt een cement 4 gevoegd dat bijvoorbeeld bestaat uit acrylmateriaal.The cup-shaped element should be received in the existing cavity of bone B (see Figure 2), which may or may not be appropriately scraped out to obtain the correct size. Between the cup-shaped element 1 and the leg, a cement 4 is added, which for example consists of acrylic material.
Teneinde de afstand tussen het komvormige element 1 en het bot B over het gehele buitenoppervlak van het komvormige element 1 even dik te houden, is het komvormige element op bekende wijze voorzien van afstandorganen 5. Deze afstandor-ganen zijn op regelmatige afstand rond het buitenoppervlak van het komvormige element 1 aangebracht hetgeen in figuur 1 schematisch is weergegeven.In order to keep the distance between the cup-shaped element 1 and the bone B equally thick over the entire outer surface of the cup-shaped element 1, the cup-shaped element is provided with spacers 5 in a known manner. These spacers are regularly spaced around the outer surface of the cup-shaped element 1 is arranged, which is shown schematically in figure 1.
Volgens de uitvinding worden de afstandelementen 5 in blinde boringen 6 van het komvormige element l aangebracht. Daartoe is elk afstandelement in hoofdzaak cilindrisch uitgevoerd, en vertoont daartoe een verankeringsdeel 7 alsmede een daarop aansluitend verjongd deel 8.According to the invention, the spacers 5 are arranged in blind bores 6 of the cup-shaped element 1. For this purpose, each spacer element is of substantially cylindrical design, and for this purpose it has an anchoring part 7 as well as a rejuvenated part 8 adjoining it.
Het verjongde deel 8 is in de getoonde uitvoeringsvorm het buiten het komvormige element 1 uitstekende deel en dient als afstandorgaan. Vanzelfsprekend is binnen het kader van de uitvinding het verjongde deel 8 kleiner uit te voeren, bijvoorbeeld als groef dat op het verankeringsdeel 7 aansluit, waarbij het buiten het komvormige element 1 uitstekende deel een gelijke diameter als het verankeringsdeel 7 heeft. Ook andere vormen van het uitstekende deel kunnen worden toegepast.In the embodiment shown, the rejuvenated part 8 is the part protruding outside the cup-shaped element 1 and serves as a spacer. Naturally, within the scope of the invention, the rejuvenated part 8 can be made smaller, for example as a groove connecting to the anchoring part 7, the part protruding outside the cup-shaped element 1 having the same diameter as the anchoring part 7. Other shapes of the projecting part can also be used.
Volgens de uitvinding is de diameter van de blinde boring 6 zodanig ten opzichte van die van het verankeringsdeel 7 gekozen, dat een perspassing mogelijk wordt.According to the invention, the diameter of the blind bore 6 is chosen relative to that of the anchoring part 7 so that a press fit is possible.
Dankzij de maatregel dat de diepte d van de boring 6 groter is dan de lengte a van het verankeringsdeel 7 (zie figuur 3), zal de diameterverandering bij A tussen het verankeringsdeel 7 en het verjongde deel 8 onder het oppervlak 0 van het komvormige element 1 liggen.Thanks to the measure that the depth d of the bore 6 is greater than the length a of the anchoring part 7 (see figure 3), the diameter change at A between the anchoring part 7 and the rejuvenated part 8 will be below the surface 0 of the cup-shaped element 1 lie.
Aangezien de perspassing in een enigszins flexibel materiaal in het komvormige element 1 plaatsvindt, zal het randgedeelte 9 van de blinde boring terugwerken over de diameterrand A heen, hetgeen op vergrote schaal in figuur 3 is weergegeven.Since the press fit takes place in the cup-shaped element 1 in a somewhat flexible material, the edge portion 9 of the blind bore will work back over the diameter edge A, which is shown on an enlarged scale in figure 3.
Dit effect kan nog worden verbeterd door het afstandorgaan uit te voeren in polymethylmethacrylaat (PMMA), terwijl het komvormige element in polyethyleen kan zijn uitgevoerd. Van deze materialen is de hardheid van het acrylmateriaal aanzienlijk hoger dan dat van polyethyleen, waardoor het terugveren "van het materiaal boven de rand A" gemakkelijker plaatsvindt.This effect can be further enhanced by making the spacer in polymethyl methacrylate (PMMA), while the cup-shaped element can be in polyethylene. Of these materials, the hardness of the acrylic material is significantly higher than that of polyethylene, making it easier to "bounce back" above edge A ".
Proefondervindelijk is vastgesteld dat de hechting van het afstandelement 5 in het komvormige element op de wijze volgens de uitvinding aanzienlijk sterker is dan de bekende methodes.It has been established experimentally that the adhesion of the spacer element 5 in the cup-shaped element in the manner according to the invention is considerably stronger than the known methods.
Voor het vergemakkelijken van het invoeren van het veranker ingsdeel 7 in de blinde boring 6 verdient het de voorkeur om de eindrand daarvan af te schuinen bij 10.To facilitate the insertion of the anchoring part 7 into the blind bore 6, it is preferable to bevel the end edge thereof at 10.
Het komvormige element 1 kan na het aanbrengen van de afstandorganen 5 op de bekende wijze in de holte van het been B worden aangebracht, door eerst een cementlaag 4 aan te brengen, vervolgens het komvormige element 1 in de holte te drukken waarbij de afstandorganen 5 van acrylmateriaal zich hechten aan het cement 4 van acrylmateriaal.The cup-shaped element 1 can be placed in the cavity of the leg B in the known manner after the spacers 5 have been fitted, by first applying a cement layer 4, then pressing the cup-shaped element 1 into the cavity, the spacers 5 of acrylic material adhere to the cement 4 of acrylic material.
De uitvinding is niet beperkt tot de hierboven beschreven uitvoeringsvorm.The invention is not limited to the above-described embodiment.
Claims (4)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL9200070A NL193791C (en) | 1992-01-15 | 1992-01-15 | Joint prosthesis. |
| DE9300471U DE9300471U1 (en) | 1992-01-15 | 1993-01-15 | Joint prosthesis |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL9200070 | 1992-01-15 | ||
| NL9200070A NL193791C (en) | 1992-01-15 | 1992-01-15 | Joint prosthesis. |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NL9200070A true NL9200070A (en) | 1993-08-02 |
| NL193791B NL193791B (en) | 2000-07-03 |
| NL193791C NL193791C (en) | 2000-11-06 |
Family
ID=19860299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL9200070A NL193791C (en) | 1992-01-15 | 1992-01-15 | Joint prosthesis. |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE9300471U1 (en) |
| NL (1) | NL193791C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0737262B1 (en) * | 1993-12-29 | 1999-08-11 | Cp Test A/S | Pile driving rig |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2733410B1 (en) * | 1995-04-27 | 1997-11-07 | Benoist Girard & Cie | ACETABULAR CUP FOR TOTAL HIP PROSTHESIS |
| GB0718821D0 (en) | 2007-09-26 | 2007-11-07 | Benoist Girard Sas | Cement spacer for use in prosthetic cup and method of use therein |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2080118A (en) * | 1980-07-05 | 1982-02-03 | Hardinge Kevin | An acetabular cup |
| EP0120595A1 (en) * | 1983-02-23 | 1984-10-03 | Minnesota Mining And Manufacturing Company | Prosthetic acetabular cup |
| US4566138A (en) * | 1983-03-08 | 1986-01-28 | Zimmer, Inc. | Prosthetic device with spacers |
| EP0331625A1 (en) * | 1988-03-01 | 1989-09-06 | GebràDer Sulzer Aktiengesellschaft | Hemispherical hip cotyl |
| FR2651996A3 (en) * | 1989-09-21 | 1991-03-22 | Augoyard Marc | Cemented prosthesis cup |
-
1992
- 1992-01-15 NL NL9200070A patent/NL193791C/en not_active IP Right Cessation
-
1993
- 1993-01-15 DE DE9300471U patent/DE9300471U1/en not_active Expired - Lifetime
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2080118A (en) * | 1980-07-05 | 1982-02-03 | Hardinge Kevin | An acetabular cup |
| EP0120595A1 (en) * | 1983-02-23 | 1984-10-03 | Minnesota Mining And Manufacturing Company | Prosthetic acetabular cup |
| US4566138A (en) * | 1983-03-08 | 1986-01-28 | Zimmer, Inc. | Prosthetic device with spacers |
| EP0331625A1 (en) * | 1988-03-01 | 1989-09-06 | GebràDer Sulzer Aktiengesellschaft | Hemispherical hip cotyl |
| FR2651996A3 (en) * | 1989-09-21 | 1991-03-22 | Augoyard Marc | Cemented prosthesis cup |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0737262B1 (en) * | 1993-12-29 | 1999-08-11 | Cp Test A/S | Pile driving rig |
Also Published As
| Publication number | Publication date |
|---|---|
| DE9300471U1 (en) | 1993-03-25 |
| NL193791C (en) | 2000-11-06 |
| NL193791B (en) | 2000-07-03 |
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| BC | A request for examination has been filed | ||
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Effective date: 20100801 |