RU2040228C1 - Endoprosthesis of the hip joint - Google Patents

Endoprosthesis of the hip joint Download PDF

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Publication number
RU2040228C1
RU2040228C1 SU5008264A RU2040228C1 RU 2040228 C1 RU2040228 C1 RU 2040228C1 SU 5008264 A SU5008264 A SU 5008264A RU 2040228 C1 RU2040228 C1 RU 2040228C1
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Russia
Prior art keywords
cup
endoprosthesis
head
hip joint
nut
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Russian (ru)
Inventor
О.А. Баршак
С.П. Гордеев
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Баршак Олег Аркадьевич
Гордеев Серафим Павлович
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Priority to SU5008264 priority Critical patent/RU2040228C1/en
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Publication of RU2040228C1 publication Critical patent/RU2040228C1/en

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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
    • A61F2/30744—End caps, e.g. for closing an endoprosthetic cavity
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A—HUMAN NECESSITIES
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    • 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
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    • 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
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    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30079—Properties of materials and coating materials magnetic
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    • 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
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    • A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
    • A61F2002/30322—The prosthesis having different structural features at different locations within the same prosthesis differing in surface structures
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
    • A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
    • A—HUMAN NECESSITIES
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    • 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
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    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
    • A61F2002/30682—Means for preventing migration of particles released by the joint, e.g. wear debris or cement particles
    • A61F2002/30683—Means for collecting wear particles in a hollow cavity inside the prosthesis
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A61F2002/30904—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves serrated profile, i.e. saw-toothed
    • 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
    • A61F2/32—Joints for the hip
    • A61F2/34—Acetabular cups
    • A61F2002/3429—Acetabular cups with an integral peripheral collar or flange, e.g. oriented away from the shell centre line
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3611—Heads or epiphyseal parts of femur
    • 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
    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • 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
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    • A61F2/32—Joints for the hip
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    • A61F2/3609—Femoral heads or necks; Connections of endoprosthetic heads or necks to endoprosthetic femoral shafts
    • A61F2002/3625—Necks
    • A61F2002/3631—Necks with an integral complete or partial peripheral collar or bearing shoulder at its base
    • 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
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    • A61F2/36—Femoral heads ; Femoral endoprostheses
    • A61F2/3662—Femoral shafts
    • A61F2002/3678—Geometrical features
    • A61F2002/369—Stepped shaft, i.e. having discrete diameter changes
    • 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
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  • 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)

Abstract

FIELD: medical engineering. SUBSTANCE: device has cup 1 with fastening teeth 2, rim 3 threaded for nut 4 and internal recess threaded for locking washer 6. Ball-shaped head 7 is in cup 1 making a hinged joint with cup 1. Head 7 is connected with leg member through neck 8 and supporting plate 9. The leg member has conic form and stepwise divided by cylindric notches. A canal for collecting abrasive material and its settler are made in the lower part of the internal surface of cup 1. Locking vertical grooves are made on the surface 2 of conic steps. EFFECT: long service life and high reliability of the prosthesis. 2 cl, 5 dwg

Description

Изобретение относится к медицинской технике и может использоваться при замене патологических суставов искусственными. The invention relates to medical equipment and can be used when replacing pathological joints with artificial ones.

Наиболее близким к изобретению является эндопротез тазобедренного сустава, содержащий чашку с зубцами, головку, шейку и ступенчатую коническую ножку. Closest to the invention is a hip joint prosthesis containing a cup with teeth, a head, a neck and a stepped conical leg.

Однако этот эндопротез не разъемен и в процессе эксплуатации не локализует абразивные частицы. However, this endoprosthesis is not detached and does not localize abrasive particles during operation.

Известен эндопротез тазобедренного сустава, содержащий чашку с зубцами, головку, шейку и ножку (Юмашев Г.С. Травматология и ортопедия. М. Медицина, 1983, с.79, рис.46 "а"). Known hip joint prosthesis containing a cup with teeth, a head, a neck and a leg (G. Yumashev Traumatology and orthopedics. M. Medicine, 1983, p.79, Fig. 46 "a").

Этот эндопротез принят за базовый объект. This endoprosthesis is taken as the base object.

Однако данный эндопротез не разъемен, его ножка не обеспечивает требуемый стабильности, а в процессе эксплуатации эндопротез не локализует абразивные частицы. However, this endoprosthesis is not detached, its leg does not provide the required stability, and during operation the endoprosthesis does not localize abrasive particles.

Цель изобретения обеспечение разборности эндопротеза, повышение прочности фиксации ножки эндопротеза в канале бедренной кости и снижение металлоза. The purpose of the invention is the provision of collapsibility of the endoprosthesis, increasing the strength of fixation of the legs of the endoprosthesis in the femoral canal and reducing metallosis.

Цель достигается тем, что ножка снабжена стопорными проточками, а чашка имеет приспособление для сбора абразива и отделяется от головки. The goal is achieved in that the leg is provided with retaining grooves, and the cup has a device for collecting abrasive material and is separated from the head.

Сущность изобретения состоит в том, что ножка эндопротеза выполнена ступенчатой с конусно-цилиндрическими переходами, причем на конусных ступеньках проточены продольные стопорные пазы. На внутренней поверхности чашки находится канал для сбора абразива и его отстойник, а чашка фиксируется на головке замковой шайбой и гайкой. The essence of the invention lies in the fact that the endoprosthesis leg is made stepwise with conical-cylindrical transitions, and longitudinal locking grooves are grooved on the conical steps. On the inner surface of the cup there is a channel for collecting abrasive and its settler, and the cup is fixed on the head with a lock washer and a nut.

На фиг. 1 показан эндопротез с разрезом чашки; на фиг.2 сечение А-А на фиг. 1; на фиг.3 замковая гайка; на фиг.4 замковая шайба; на фиг.5 канал для сбора и отстойник абразива. In FIG. 1 shows an endoprosthesis with a cut of a cup; FIG. 2, section AA in FIG. 1; figure 3 lock nut; figure 4 lock washer; figure 5 channel for collecting and settling abrasive.

Эндопротез состоит из чашки 1 с зубцами 2, буртиком 3 с резьбой под замковую гайку 4 и внутренним кольцевым пазом 5 с резьбой под замковую шайбу 6. The endoprosthesis consists of a cup 1 with teeth 2, a shoulder 3 with a thread for a lock nut 4 and an internal annular groove 5 with a thread for a lock washer 6.

Замковая шайба 6 снабжена наружной резьбой и ввертывается в паз 5 вилочным ключом (не показан). Гайка 4 при этом является для шайбы 6, фиксирующей ее положение, контргайкой. Буртик 3 снаружи и изнутри имеет разнозаходные резьбы. The lock washer 6 is provided with an external thread and is screwed into the groove 5 with a fork key (not shown). In this case, the nut 4 is a lock nut for the washer 6 fixing its position. The bead 3 externally and externally has multiple threads.

Внутри чашки 1 находится шаровидная головка 7, образующая с чашкой 1 сферический шарнир. Головка 7 через изогнутую в сечении круглую шейку 8 и опорную плиту 9 монолитно соединена с конической ножкой 10. Inside the cup 1 is a spherical head 7, forming with the cup 1 a spherical hinge. The head 7 through a bent in cross section round neck 8 and the base plate 9 is seamlessly connected to the conical leg 10.

Ножка 10 ступенчато-коническая, имеет по всей длине цилиндрические проточки 11, высота которых h равна высоте Н конусных ступенек 12. На конических участках 12 находятся вертикальные ротационно-стопорные лыски 13 и 14 с односторонними прилежащими друг к другу продольными выступами 15 и 16, грани которых перпендикулярны плоскостям лысок. The leg 10 is step-conical, has cylindrical grooves 11 along the entire length, the height of which h is equal to the height H of the conical steps 12. On the conical sections 12 there are vertical rotational-stop flats 13 and 14 with one-sided longitudinal protrusions 15 and 16 adjacent to each other, faces which are perpendicular to the flats.

В нижней части внутренней поверхности чашки 1 выполнен канал 17 и соединенный с ним отстойник 18 для локализации абразива. In the lower part of the inner surface of the cup 1, a channel 17 and a sump 18 connected to it are made for localizing the abrasive.

Эндопротез применяют следующим образом. The endoprosthesis is used as follows.

Вскрывают под общим наркозом область патологического тазобедренного сустава, осуществляют вывих его головки и обработку вертлужной впадины под чашку 1. Выполняют резекцию суставного конца и, удалив мозг из костно-мозгового канала бедренной кости, рассверливают его конусной разверткой несколько большей диаметром, чем конические ступеньки 12 ножки 10. Вставляют чашку 1 в вертлужную впадину и вколачивают (или в зависимости от конструкции зубцов 2 ввертывают) ее в дно вертлужной впадины. Under general anesthesia, the area of the pathological hip joint is opened, its head is dislocated and the acetabulum under cup 1 is resected. The articular end is resected and, after removing the brain from the medullary canal of the femur, drill it with a conical scan of slightly larger diameter than the conical steps of 12 legs 10. Insert the cup 1 into the acetabulum and hammer (or, depending on the design of the teeth 2, screw it) into the bottom of the acetabulum.

В нижнюю часть рассверленного костно-мозгового канала вводят пробку из обработанной кости или биоинертного материала и наполняют его до 1/2 глубины жидкой пастой костного цемента. Через ножку 10 на шейку 8 одевают замковую шайбу 6 и замковую гайку 4, после чего вводят ножку 10 в костно-мозговой канал и вдвигают ее до посадки опорной плиты 9 на торец среза суставного конца. A cork made of treated bone or bioinert material is introduced into the lower part of the bone marrow canal and filled to a depth of 1/2 with a liquid paste of bone cement. A lock washer 6 and a lock nut 4 are put on the neck 8 through the leg 10, after which the leg 10 is inserted into the bone marrow canal and inserted until the base plate 9 fits onto the cut end of the joint end.

Удаляют выступивший из-за плиты 9 выдавленный лишний цемент и после его затвердевания вправляют головку 7 в чашку 1. В паз 5 ввертывают шайбу 6 и навертывают гайку 4, прочно фиксируя шайбу 6 ее внутренней выточенной по сфере стороной к головке 7, подвижно закрепляя ее в чашке 1. Рану послойно ушивают и приступают к реабилитационным мероприятиям. The squeezed out excess cement protruding from the plate 9 is removed and, after hardening, the head 7 is inserted into the cup 1. Screw the washer 6 into the groove 5 and screw the nut 4, firmly fixing the washer 6 with its inner side turned along the sphere to the head 7, movably fixing it in cup 1. The wound is sutured in layers and proceed with rehabilitation measures.

Возможна также установка эндопротеза в неразобранном виде, т.е. уже в сочлененном положении. It is also possible to install the endoprosthesis unassembled, i.e. already in the articulated position.

Предлагаемый эндопротез предназначен для применения в травматологоортопедических клиниках и исключает вероятность возникновения нестабильности и металлоза, облегчает процесс установки и ревизии. The proposed endoprosthesis is intended for use in trauma and orthopedic clinics and eliminates the likelihood of instability and metallosis, facilitates the installation and revision process.

Claims (2)

1. ЭНДОПРОТЕЗ ТАЗОБЕДРЕННОГО СУСТАВА, содержащий чашку с зубцами, головку, шейку и ступенчатую коническую ножку, отличающийся тем, что ступенчатость ножки образованна цилиндрическими проточками и коническими участками, имеющими ротационно-стопорные лыски с односторонними прилежащими друг к другу продольными выступами, грани которых перпендикулярны плоскостям лысок, причем на чашке выполнен буртик, имеющий снаружи и изнутри разнозаходные резьбы под замковые шайбу и гайку. 1. An endoprosthesis of the hip joint containing a cup with teeth, a head, a neck and a stepped conical foot, characterized in that the steppedness of the foot is formed by cylindrical grooves and conical sections having rotationally locking flats with one-sided longitudinal protrusions adjacent to each other with the sides of the plane of the it is bald, and on the cup there is a flange having different and external threads under the lock washer and nut on the outside and inside. 2. Эндопротез по п.1, отличающийся тем, что на внутренней поверхности чашки выполнен канал, связанный с подмагниченным отстойником. 2. The endoprosthesis according to claim 1, characterized in that on the inner surface of the cup is made a channel associated with a magnetized sump.
SU5008264 1991-08-01 1991-08-01 Endoprosthesis of the hip joint RU2040228C1 (en)

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Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Патент США N 3820167, кл. A 61F 1/24, 1974. *

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