CN107874824B - Marrow core supporter and pushing device thereof - Google Patents
Marrow core supporter and pushing device thereof Download PDFInfo
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- CN107874824B CN107874824B CN201711443117.7A CN201711443117A CN107874824B CN 107874824 B CN107874824 B CN 107874824B CN 201711443117 A CN201711443117 A CN 201711443117A CN 107874824 B CN107874824 B CN 107874824B
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- 230000008093 supporting effect Effects 0.000 claims abstract description 176
- 210000001185 bone marrow Anatomy 0.000 claims description 13
- 208000010392 Bone Fractures Diseases 0.000 claims description 9
- 208000006670 Multiple fractures Diseases 0.000 claims description 6
- 230000007704 transition Effects 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000017074 necrotic cell death Effects 0.000 abstract description 13
- 206010061363 Skeletal injury Diseases 0.000 abstract description 2
- 210000000988 bone and bone Anatomy 0.000 description 15
- 238000000034 method Methods 0.000 description 8
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000002513 implantation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000017531 blood circulation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001338 necrotic effect Effects 0.000 description 2
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 2
- 206010017076 Fracture Diseases 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 210000001789 adipocyte Anatomy 0.000 description 1
- 210000001188 articular cartilage Anatomy 0.000 description 1
- 210000002449 bone cell Anatomy 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 210000004394 hip joint Anatomy 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 208000028867 ischemia Diseases 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 210000005065 subchondral bone plate Anatomy 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 210000000689 upper leg Anatomy 0.000 description 1
- 230000002792 vascular Effects 0.000 description 1
Classifications
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- 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
- A61B17/74—Devices for the head or neck or trochanter of the femur
-
- 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
- A61B17/88—Osteosynthesis instruments; Methods or means for implanting or extracting internal or external fixation devices
Abstract
The invention discloses a marrow core supporter and a pushing device thereof, which belong to the field of medical appliances and are used for treating femoral head necrosis or other bone injuries. The supporting device is connected to the pushing device in a compressed state, the supporting device is pushed into the marrow cavity by the pushing device, the marrow core supporting device is rotated by a certain angle by utilizing the rotating screw rod and then bounces off, and the marrow core supporting device is supported inside the femoral head to prevent collapse of the femoral head. The invention prevents the femoral head from collapsing further after the operation is performed at the early stage of femoral head necrosis, shortens the time for patients to lie on the bed, and has simple and convenient operation during the operation, and is firm and reliable after being placed.
Description
Technical Field
The invention belongs to the technical field of medical appliances, in particular to a supporting device which is arranged in a marrow core and is used for supporting bones and a pushing device thereof.
Background
The bone is difficult to restore after fracture, and the bone can not bear the force for a long time after the operation. Femoral head necrosis is a common disease of orthopaedics, and the main reason of the femoral head necrosis is femoral head bone ischemia caused by blocked femoral head blood circulation and damaged femoral head, thereby causing bone cell, bone marrow stroma cell and fat cell necrosis. Progression of femoral head necrosis often results in collapse of the subchondral bone of the femoral head and articular cartilage.
The early treatment methods of femoral head necrosis generally adopt operation methods such as core decompression, bone grafting, vascular implantation, osteotomy and the like, and the methods hope to reconstruct the blood circulation of the femoral head to achieve the treatment purpose, but after the treatment methods are implemented, the femoral head lacks powerful support, and the further collapse of the femoral head cannot be prevented. At present, in the process of treating femoral head necrosis in countries such as the United states, a metal tantalum rod is used as a support in the femoral head, the metal tantalum support rod is cylindrical in shape and is similar to a screw rod, the outer end of the support rod is provided with threads, and the head of the inner end of the support rod is hemispherical. When in use, an operation hole needs to be drilled on the side surface of the femoral head towards the inside of bone marrow and the femoral head direction, then the round head end of the support rod is inserted into the bone layer, and the external end screw thread of the support rod is connected with the bone layer, so that the round head of the support rod is propped against the upper part of the femoral head and the position where collapse is possible. The supporting rod has small contact area with the inner surface of the femoral head after implantation, even the round head of the supporting rod is in point contact with the inner surface of the femoral head, the supporting effect is poor, the femoral head can be worn or even worn out to form new injury, finally the necrotic femoral head can be cut off, hip joint replacement operation can be performed after a long time, and the pain and the economic burden of a patient can be increased.
The Chinese patent document (application number 9725056.2.4) also discloses a femoral head memory metal bracket, which adopts metal wires to be cross-woven into a circular ring with a spherical surface, and when the femoral head and neck support is used, holes are formed in the femoral head and neck, then the bracket is placed into a marrow cavity through the holes by compressing the circular ring of the bracket, and then the bracket is opened by the elasticity of the metal wires of the bracket to try to play a role in supporting the collapsed bone surface. However, the stent cannot be fixed in bone marrow, and can possibly walk, and can possibly not support the part to be supported, and the stent has weak supporting force and poor stability, so that the current requirement for treating early femoral head necrosis is difficult to meet.
Disclosure of Invention
The invention aims to solve the technical problem of providing a marrow core supporter and a pushing device thereof, which are used for treating femoral head necrosis, can provide effective support for collapsed parts after being implanted into a human body, prevent the femoral head from collapsing further, are firm and reliable after being implanted, and are convenient to use and simple to operate.
In order to solve the technical problems, the invention adopts the following technical scheme:
a marrow core supporter is composed of a spherical crown-type supporting head with external surface and supporting parts able to be sprung out.
The invention further improves that: the supporting piece is hinged at the bottom of the supporting head in a bilateral symmetry way through the connecting rotating shaft, and the supporting piece is opened through a spring.
The technical scheme of the invention is further improved as follows: the support piece is hinged with the support head through a connecting rotating shaft and rotating shaft seats respectively arranged on the support piece and the support head, and the connecting rotating shaft is inserted into shaft holes of the rotating shaft seats of the support piece and the support head.
The technical scheme of the invention is further improved as follows: the spring is a torsion spring, an elastic sheet or an elastic wire; the spring is supported between the two support members when the spring is an elastic sheet or an elastic wire.
The invention further improves that: the bottom of the support piece is provided with a hanging hole which can enable the support piece to be hooked.
The technical scheme of the invention is further improved as follows: the hanging hole is a circular hole, and a hanging boss is arranged at the inner end of the circular hole.
The technical scheme of the invention is further improved as follows: the inner end of the hanging hole is a strip hole or an elliptical hole.
The invention further improves that: the two sides of the bottom end of the supporting piece are respectively provided with pushing and rotating bosses which correspond to each other.
The invention further improves that: through holes for placing active broken bones are respectively arranged on the surfaces of the supporting head and the supporting piece; the surfaces of the supporting head and the supporting piece are provided with micropores for bone marrow growth fusion.
The technical scheme of the invention is further improved as follows: the size of the micropores is 90 mu m-300 mu m.
The invention further improves that: the bottom of the support is provided with a row of barbs facing outwards.
The invention further improves that: the outer surfaces of the support head and the support piece are spherical crowns, and when the support piece is opened, the outer surface of the support piece is contacted with the outer surface of the support head to form a spherical crown surface with smooth and gentle transition; when the supporting piece is opened, the bottom end of the supporting piece is positioned at the position of the lower part of the medullary cavity, which is smaller than the diameter of the medullary cavity; the outer circumferential dimension of the two supporting pieces is not larger than the outer circumferential dimension of the supporting head when the supporting pieces are compressed and folded.
The pushing device of the marrow core supporter comprises a pushing rod, wherein a clamping joint for clamping the marrow core supporter is arranged at the top end of the pushing rod, and a rotating screw rod which corresponds to the clamping joint and is positioned on the side surface of the clamping joint after extending out is arranged along the length direction of the pushing rod.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the clamping connector comprises a vertical rod fixedly connected to the top end of the push rod, a clamping connecting rod transversely arranged relative to the vertical rod is fixedly connected to the upper part of the vertical rod, and clamping cross beams for hooking the marrow core support are arranged at two ends of the clamping connecting rod; the length direction of the clamping cross beam forms a certain angle with the vertical rod of the clamping connector; the jacking screw rod is positioned on the radial side surface of the clamping connecting rod.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the side surface of the clamping cross beam is in a strip shape or an oval shape corresponding to the hanging hole on the supporting piece of the marrow core supporting device.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the two top rotating screws are symmetrically arranged by taking the clamping joint as a center.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the jacking screw rod is arranged in the circular long holes which are positioned in the pushing rod and are opposite to each other in the radial direction.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the outer end of the pushing rod is fixedly connected with a limiting handle, and the jacking screw rod is connected with the limiting handle through threads; the tail end of the jacking screw rod is provided with a knurled handle.
The invention further improves the pushing device of the marrow core supporter, which comprises the following steps: the diameter of the pushing rod is not greater than the outer dimension of the core supporter.
By adopting the technical scheme, the invention has the following technical progress:
the marrow core supporter is placed in the femoral head or other marrow cavities needing supporting, is used for treating femoral head necrosis or other bone fracture, can provide effective support for collapsed or broken parts, prevents the femoral head from further collapsing, and is firm and reliable after being placed. The pushing device can accurately send the marrow core supporter into the marrow cavity in the femoral head or other parts, and the marrow core supporter is separated from the pushing device after rotating for a certain time, and the marrow core supporter bounces off and is supported in marrow; the pushing device and the marrow core supporter are matched for use, the operation is simple and convenient, and the placing position and the angle of the marrow core supporter can be accurately supported to the collapsed position. The supporter is connected to the pushing device in a compressed state, the supporter is pushed into the pre-drilled ball hole through the pushing device, the supporter is rotated by a certain angle by utilizing the rotating screw rod to enable the supporter to spring open, and the supporter is supported inside the femoral head to prevent collapse of the femoral head. The invention has the advantages of supporting force after operation in early stage of femoral head necrosis, preventing further collapse of femoral head, shortening the time of patient lying on bed, along with simple and convenient operation during operation, and firmness and reliability after implantation.
The marrow core supporter comprises a supporting head positioned in the middle and two supporting pieces positioned at two sides of the supporting head, after the pushing device of the marrow core supporter pushes the marrow core supporter in place, the two supporting pieces can be sprung out and supported in marrow of a femoral head, and the two supporting pieces can firmly play a supporting role, so that the supporting head is aligned to a diseased or collapsed bone part, and the bone is prevented from collapsing.
The outer surface of the supporting head is spherical crown type, is close to the shape of the femoral head medullary cavity, is suitable for being used in the medullary cavity, can play a good role in fitting and supporting, can provide effective support for a collapsed part, and can form larger-area contact with the femoral head cavity, so that the risk of wearing or even wearing the femoral head is avoided. The outer surface of the support piece can be made into the same shape as the support head, the outer surfaces of the support piece are made into spherical crowns, when the support piece is opened, the outer surface of the support piece is contacted with the outer surface of the support head to form a larger spherical crown surface, and the three spherical crown surfaces can smoothly and gently transition, so that the support area of bones is increased.
The support piece and the support head of the marrow core supporter are hinged together through the connecting rotating shaft and the rotating shaft seat to form a hinge type connecting structure, and the support piece is spread on two sides of the support head through the springs. The hinged position of the connecting rotating shaft and the rotating shaft seat is at the bottom of the supporting head, the connecting rotating shaft and the rotating shaft seat are hidden below the supporting head and the supporting piece, the shape of the supporting surface at the upper part is not affected, and when the supporting piece is opened, the spherical crown surface of the supporting piece and the spherical crown surface of the supporting head are in close contact and smoothly transition, so that no gap or interval exists between the spherical crown surface and the spherical crown surface of the supporting piece.
The means by which the support member is sprung open by the core support of the present invention may be a spring, preferably a torsion spring, a resilient tab or a resilient wire. When the spring is the elastic sheet or the elastic wire, the elastic sheet or the elastic wire can be supported between the two supporting pieces, the torsion spring can be arranged on the connecting rotating shaft, the supporting pieces can be ensured to be sprung and stably supported, and the compression of the two supporting pieces can be facilitated.
According to the marrow core supporter, the outward row of barbs are arranged at the bottom of the supporting piece, and when the supporting piece is sprung open, the barbs can penetrate into the inner wall of the femoral head, so that stable support can be achieved.
The micropores are arranged on the surfaces of the supporting head and the supporting piece of the marrow core supporter, so that the growing marrow can slowly grow into the micropores and is fused with the marrow core supporter to form a whole. Through holes arranged on the surface of the supporting head and the surface of the supporting piece can enable new bone marrow to grow into the supporting device, and active broken bones placed in the marrow core supporting device can also be integrated with bone marrow on the inner wall of the femoral head through the through holes in a fusion growth way; with the growth of bone marrow, the newly-generated bone marrow can wrap the marrow core supporter and be fused into a whole; thereby achieving good treatment purpose. The size (depth or diameter) of the micropore is generally 90 mu m-300 mu m, and the size is different, so that when newly grown bone marrow enters the micropore, the bone marrow can be firmly planted in the micropore, and fresh active bone convenient to implant can grow into the support as soon as possible, and is firmly combined with the marrow core support, so that the support and the femoral head grow into a whole.
The pushing device of the marrow core supporter is characterized in that a clamping joint is arranged at the top end of a pushing rod, and the clamping joint can clamp and hang the compressed marrow core supporter to enable the marrow core supporter to be in a contracted state; the jacking screw rod is positioned at one side of the clamping joint, and can push the marrow core supporter to rotate around the clamping joint when extending out, the spherical crown of the core supporter is aligned with the portion to be supported.
The clamping connecting rod of the clamping connector of the pushing device is transversely arranged on the vertical rod of the clamping connector, the clamping cross beam is fixed at two ends of the clamping connecting rod and transversely arranged relative to the clamping connecting rod, and the hanging holes arranged at the bottom ends of the two supporting pieces of the marrow core supporter correspond to the clamping cross beam, so that the clamping cross beam can extend into the hanging holes of the supporting pieces, and the clamping cross beam can hook the supporting pieces through rotation, so that the two supporting pieces of the marrow core supporter are kept in a compressed state. The inner end of the hanging hole of the marrow core supporter is provided with a hooking boss, the inner end of the hanging hole is a strip hole or an elliptical hole, the side surface of the clamping cross beam is in a shape corresponding to the hole pattern of the hanging hole, the clamping cross beam can extend into the hanging hole from the inner side of the marrow core supporter, after the marrow core supporter rotates for a certain angle, the clamping cross beam is lapped on the hooking boss of the hanging hole, so that the supporting piece of the marrow core supporter is hooked by the clamping cross beam of the clamping joint, and the marrow core supporter is kept in a contracted state so as to convey the marrow core supporter into the marrow cavity of the femoral head through the operation hole. The side surfaces of the hanging hole and the clamping cross beam are shaped like a strip or an ellipse, so that hooking and unhooking operations are most convenient.
The length direction of the clamping cross beam of the pushing device forms a certain angle with the vertical rod of the clamping joint, and the angle can be determined according to the position and the angle of punching the femoral head marrow cavity in the operation process and is generally set to be 45 degrees; when the marrow core supporter is compressed and hooked and then rotated for 45 degrees, the marrow core supporter and the pushing rod are kept in a straight line state, and after the marrow core supporter is conveyed into the marrow cavity, the marrow core supporter is reversely rotated for 45 degrees, and the two supporting pieces of the marrow core supporter lose the hooking constraint that the pushing device clamps the cross beam and are naturally sprung.
The pushing device has the advantages that the pushing screw rods are positioned on the radial side surfaces of the clamping connecting rods, in general, the pushing screw rods can be symmetrically arranged at two, pushing bosses corresponding to the pushing screw rods are also arranged at the bottom ends of the supporting pieces of the marrow core supporter, the pushing bosses are simultaneously propped by the two pushing screw rods in the marrow cavity, and the marrow core supporter is rotated through pushing and loosening, so that the rotating angle of the marrow core supporter is accurate, the hemispherical surface of the marrow core supporter is accurately attached to the upper surface of the inside of the femoral head, and the operation is simple and convenient. The jacking screws should be symmetrically arranged with the clamping joint as a center, so that during the process of feeding the core supporter into the medullary cavity, the two jacking screws can jack the core supporter tightly and position the core supporter so that the core supporter cannot rotate.
The pushing rod is arranged inside the pushing rod, so that the volume of the pushing device can be reduced, holes drilled in bones can be smaller during operation, and the guiding and positioning effects on the pushing rod can be achieved, so that pushing is more accurate. The limit handle at the outer end of the pushing rod is convenient to operate, and a longer threaded connection channel is provided for the jacking screw rod, so that the jacking screw rod is more accurate in position during rotation. The knurled handle at the tail end of the jacking screw rod can conveniently rotate the jacking screw rod, so that the jacking screw rod can move forwards or backwards more accurately.
The diameter of the pushing rod of the pushing device of the marrow core supporter is not larger than the outer dimension of the supporting head of the marrow core supporter, and the peripheral dimension of the two supporting parts is not larger than the outer dimension of the supporting head when the supporting parts of the marrow core supporter are compressed and folded, so that when the marrow core supporter is compressed and hooked on the clamping joint of the pushing device, the outer dimension of the spherical crown section of the supporting head of the marrow core supporter is the maximum dimension, and the dimension of an operation hole punched on a femur in operation can be referred to the outer dimension of the supporting head of the marrow core supporter, and the dimension of the operation hole can be reduced as much as possible.
The length of the supporting piece of the marrow core supporting device can be slightly longer, when the supporting piece is opened, the bottom end of the supporting piece can be supported at the lower part of the marrow cavity, namely the position below the diameter of the marrow cavity, so that the supporting piece can be reinforced to support the whole marrow core supporting device, and the supporting force is increased.
The marrow core supporter can provide effective support for the collapse part after being implanted into a human body and form larger-area contact with the femoral head, thereby avoiding the risk of wearing or even grinding the femoral head in the treatment and use process of the traditional implantation device, improving the success rate of operation, improving the effect of operation, reducing the pain of patients and having wide clinical application prospect.
Drawings
FIG. 1 is a schematic illustration of the structure of a core holder and its pushing device after connection;
FIG. 2 is a schematic view of the free-distracted configuration of the core holder;
FIG. 3 is a schematic side view of a core support;
FIG. 4 is a schematic view of the compression state of the core holder;
FIG. 5 is a schematic view of the structure of the core supporter pushing apparatus;
FIG. 6 is a schematic view of a partial construction of a core supporter pushing apparatus;
FIG. 7 is a schematic illustration of the rotation of the core holder under the pushing of the pusher device;
in the figure, 1, a supporting head; 2. a support; 4. the connecting rotating shaft; 5. a limit handle; 6. a clamping connector, a clamping connecting rod, a clamping cross beam and a clamping cross beam, wherein the clamping connector is 6.1; 7. a push rod; 8. rotating the screw rod; 9. a pin; 10. a lock nut; 11. knurled handles; 12. a spring; 13. a rotating shaft seat; 14. a hanging hole; 15. Pushing and rotating the boss; 16. hooking the boss; 18. a through hole; 19. and (3) barbs.
Detailed Description
The invention is further described in detail below with reference to examples and figures:
the invention comprises a marrow core supporter and a pushing device of the marrow core supporter, wherein the pushing device is used for placing the marrow core supporter into a marrow cavity, especially a marrow cavity of a femoral head so as to support broken or necrotic bones, and is particularly helpful for treating femoral head necrosis or comminuted bone injury. Figures 1 to 7 illustrate the specific structure, free state, state of the surgical procedure of the present invention.
The marrow core supporter comprises a supporting head 1 and two supporting pieces 2, wherein the two supporting pieces are positioned at two sides of the supporting head 1, the supporting pieces 2 can be folded or unfolded relative to the supporting head 1, the outer surface of the supporting head 1 is spherical crown type, the supporting pieces can also be spherical crown type, namely, the outer surfaces of the supporting head 1 and the supporting pieces 2 are spherical crown type, the two supporting pieces 2 and the supporting head 1 can form a larger spherical crown surface after being unfolded, the outer surface of the supporting piece 2 and the outer surface of the supporting head 1 can be in relatively close contact when the supporting piece 2 is unfolded, and the formed larger spherical crown surface can be smoothly and gently transited.
The surfaces of the supporting head 1 and the supporting piece 2 are respectively provided with a through hole 18 for placing fresh broken bones, the through holes are generally arranged in the spherical center of the supporting head or the supporting piece, fresh active broken bones can be placed in the through holes, and along with the growth of bone marrow, the active broken bones can be connected with bones outside the marrow core supporting device into a whole through the through holes.
The inner and outer surfaces of the support head 1 and the support piece 2 are respectively provided with micropores or pits, and the sizes of the micropores are generally designed to be 90 mu m-300 mu m and can be different in size. The active broken bone placed in the spherical surface of the marrow core supporter is contacted with and filled in the micropores on the inner surfaces of the supporting head 1 and the supporting piece 2 when growing, the marrow outside the spherical surface of the marrow core supporter is contacted with and filled in the micropores on the outer surfaces of the supporting head 1 and the supporting piece 2 when growing, and when newly grown marrow enters the micropores, the marrow can be firmly planted in the micropores and firmly combined with the marrow core supporter, so that the supporter is fused with the marrow growth and grows into a whole.
Two supporting pieces 2 of the marrow core supporting device are hinged on two sides of the supporting head 1 in bilateral symmetry, and the supporting pieces 2 are connected with the supporting head 1 through a connecting rotating shaft 4. The upper part of the support piece 2 is provided with two rotating shaft seats 13, and the rotating shaft seats 13 are symmetrically arranged on two sides of the upper part of the support piece 2; the bottom surface (below the concave surface) of the supporting head 1 is also provided with rotating shaft seats which are correspondingly matched with the rotating shaft seat 13 at the upper part of the supporting piece 2, the rotating shaft seats are provided with shaft holes, the connecting rotating shaft 4 is inserted into the shaft holes of the rotating shaft seats of the supporting piece 2 and the supporting head 1, and the supporting piece 2 and the supporting head 1 are hinged together, so that the supporting piece 2 and the supporting head 1 can relatively rotate towards a hinge. Also provided within the core holder is a spring 12 which expands the support 2. The spring 12 may be a torsion spring, a resilient tab, a resilient wire, or other resilient mechanism that enables the support to expand. When the spring is a torsion spring, the torsion spring can be arranged on the connecting rotating shaft 4, so that the support piece 2 and the support head 1 have elasticity and can be opened. If the spring 12 is an elastic sheet or an elastic wire, the elastic sheet or the elastic wire can be supported between the two supporting pieces 2 after being bent inwards; if the springs 12 are elastic steel wires, two springs can be arranged and supported between the lower feet on the inner sides of the two supporting pieces 2, and the elastic wires can be matched with torsion springs for use, so that the springs can be made thinner, and the influence on bone marrow growth is reduced.
The middle position of the bottom end of the supporting piece 2 of the marrow core supporter is provided with a hanging hole 14, the hanging hole 14 is used for enabling the supporting piece 2 to be hooked so as to realize inward compression of the two supporting pieces and keep a compressed state, and after the two supporting pieces are sent into a designated position of a marrow cavity, the supporting pieces can be sprung out after rotating, so that the hanging hole is not a circular hole with a through length, and the hanging hole can be a long strip hole or an elliptical hole with a through length. The hanging hole 14 can also be designed to have different shapes and sizes at the inner end and the outer end, the outer end can be a round hole or a hole with other shapes, the aperture of the outer end is larger than that of the inner end, the hole of the inner end cannot be round, a hooking boss is needed, the hole of the inner end needs to be smaller than that of the outer end, and the hanging hole is preferably round in shape, and the inner end is a strip hole or an elliptical hole. The hook on the pushing device of the marrow core supporter of the invention can pass through the strip hole or the hanging hole of the elliptical hole and hook the hooking boss arranged at the inner end of the hanging hole, and the hook can be separated from the hanging hole after the supporter rotates, so that the supporter can be sprung.
The pushing device of the marrow core supporter comprises a pushing rod 7, wherein a clamping joint 6 for clamping the marrow core supporter is arranged at the top end of the pushing rod 7, and a rotating screw rod 8 is arranged along the length direction of the pushing rod.
The clamping connector 6 of the pushing device comprises a vertical rod fixedly connected to the top end of a pushing rod 7, a clamping connecting rod 6.1 is fixedly connected to the upper portion of the vertical rod, the clamping connecting rod 6.1 is transversely and vertically arranged relative to the vertical rod of the clamping connector 6, clamping cross beams 6.2 are arranged at two ends of the clamping connecting rod 6.1, the clamping cross beams 6.2 are equivalent to hooks and are used for hooking two supporting pieces of a marrow core supporting device, the shape and the size of the clamping cross beams 6.2 correspond to those of hanging holes 14 of the marrow core supporting device supporting piece 2, the side shape (seen from the direction perpendicular to the clamping connecting rod 6.1) of the clamping cross beams 6.2 can be designed into a strip shape or an ellipse shape, the length of the clamping cross beams is matched with the length of holes at the inner ends of the hanging holes 14, and the width of the clamping cross beams is matched with the width of the holes at the inner ends of the hanging holes. The length direction of the clamping cross beam 6.2 and the vertical rod of the clamping joint 6 form a certain angle, and the angle can be set to be 45 degrees in general, namely, the angle between the length direction of the clamping cross beam 6.2 and the axial direction (namely, the length direction) of the clamping joint 6, and can be set to be other angles, such as 30 degrees, 50 degrees and the like, according to the perforation angle in operation. When the core supporter deflects a certain angle and compresses the supporting piece 2 of the core supporter inwards, the clamping cross beam 6.2 can extend into the hanging hole 14, and when the core supporter rotates a certain angle again, the clamping cross beam 6.2 is hooked on the hooking boss 16 of the hanging hole 14 and cannot deviate, so that the core supporter supporting piece 2 cannot be unfolded, therefore, the length of the clamping connecting rod 6.1 corresponds to the distance between the two hanging holes after the compression of the core supporter supporting piece 2, that is, the distance between the inner surfaces of the clamping cross beam 6.2 positioned at two ends of the clamping connecting rod 6.1 corresponds to the distance between the outer surfaces of the hooking bosses 16 in the two hanging holes after the compression of the core supporter supporting piece 2.
Because the length direction of the clamping cross beam 6.2 forms a certain angle with the vertical rod of the clamping connector 6, when the marrow core supporter needs to be installed into the pushing device, the direction of the hanging hole on the supporting piece 2 can be aligned with the direction of the clamping cross beam 6.2, then the two supporting pieces 2 of the marrow core supporter are compressed, the clamping cross beam 6.2 enters the hanging hole, and then the clamping cross beam is hooked on the hooking boss 16 at the inner end of the hanging hole 14 when the marrow core supporter is rotated. When the marrow core supporter needs to be separated from the pushing device, the marrow core supporter can rotate around the clamping connecting rod 6.1, when the length direction of the hanging hole 14 is rotated to correspond to the length direction of the clamping cross beam 6.2, the shape of the hanging hole 14 is overlapped with the shape of the clamping cross beam 6.2, the two supporting pieces 2 spring open, and the marrow core supporter is separated from the pushing device.
Of course, the inner surface of the hanging hole 14 of the present invention may be a hole without a hooking boss (such as a long strip hole or an oval hole), so that the clamping beam 6.2 may extend to the outer surface of the hanging hole 14, that is, the outer surface of the support member 2, and then the clamping beam 6.2 is hooked on the outer surface of the support member 2 by rotating the core supporter, so that the compression state of the two support members 2 of the core supporter can be achieved and maintained, and the disengagement spring action can be achieved.
The top turning screw 8 of the pushing device is a component for pushing the core holder. The jacking screw rods 8 correspond to the clamping connectors 6, the jacking screw rods 8 are located on one side of the clamping connectors 6 after extending out and are located on the radial side faces of the clamping connecting rods 6.1 at the same time, the jacking screw rods 8 are symmetrically arranged by taking the clamping connectors 6 as the center, and therefore when the two jacking screw rods 8 extend out, the jacking screw rods can be jacked onto the marrow core supporters at the same time, so that the marrow core supporters are fixed; when the core supporter is required to rotate, one of the jacking screws 8 can be loosened backward while the other jacking screw is jacked forward, so that the core supporter can stably rotate without the accident of unhooking in advance.
The bottom end and two sides of the supporting piece 2 of the marrow core supporting device can be respectively provided with a pushing and rotating boss 15, the pushing and rotating bosses 15 are mutually corresponding and symmetrical, and the pushing and rotating bosses on the two supporting pieces 2 are equal in size; after the compressed bottom ends of the two supporting pieces 2 are close, the pushing screw rod 8 of the pushing device can conveniently push against the pushing boss 15 of the two supporting pieces 2, so that the rotation of the marrow core supporter is convenient, and stable support is formed.
The pushing and rotating screw rod 8 can be arranged outside the pushing rod 7 and on two axial sides, but is preferably arranged inside the pushing rod 7, long holes can be formed in the radial edge of the pushing rod 7 along the axial direction of the pushing rod 7, the long holes are positioned in the diameter direction of the pushing rod 7 and are oppositely arranged, the long holes can be round holes, the pushing and rotating screw rod 8 is arranged in the round long holes, and the diameter of the round long holes is 0.1-0.3mm larger than that of the pushing and rotating screw rod. The slot can define a counter-rotating screw 8, which can have an opening at the radial edge of the push rod 7, so that the diameter of the push rod 7 can be reduced.
The outer end (the end opposite to the clamping joint 6) of the pushing rod 7 of the pushing device can be fixedly connected with the limit handle 5; the limiting handle 5 is internally provided with a threaded hole, the jacking screw rod 8 is connected with the limiting handle 5 through threads, and when the jacking screw rod 8 is rotated, the jacking screw rod 8 can extend or retract.
The push rod is connected with the limit handle, and the clamping joint vertical rod is connected with the push rod and can be fixed through the pin 9.
The end of the rotating screw 8 (the outer side of the limit handle) can be provided with a knurled handle 11, and the knurled handle 11 can be connected with the rotating screw 8 through threads and is locked through a locking nut 10.
The diameter of the pushing rod 7 of the pushing device should not be larger than the outer dimension of the core supporter, and at the same time, the outer circumferential dimension of the two supporting members 2 is not larger than the outer circumferential dimension of the supporting head 1 when the supporting members 2 of the core supporter are compressed and folded, i.e. the folded supporting members 2 are contracted under the umbrella cover of the supporting head 1 and do not exceed the coverage range of the umbrella cover of the supporting head 1. That is, when the two supporting members 2 are compressed and folded and mounted on the front end of the pushing rod 7 of the pushing device, the outer edge diameter of the spherical crown section of the supporting head 1 should be the largest dimension of the core supporter and the pushing rod 7 (diameter), so that the core supporter and the pushing rod 7 can pass smoothly as long as the supporting head 1 can pass through the operation hole.
The length of the support member of the core supporter can be slightly longer, when the core supporter enters the medullary cavity of the femoral head and the support member 2 is opened, the bottom end of the support member is positioned at the lower part of the medullary cavity and is smaller than the diameter of the medullary cavity, so that the support member can be supported below the maximum diameter of the medullary cavity, and the core supporter cannot move up and down in the medullary cavity at will. The bottom of the supporting element 2 may be further provided with outward barbs 19, the barbs 19 are located at the outer side of the bottom of the supporting element 2 and at the edge of the spherical cap surface, the number of the barbs 19 may be optionally set, one or two barbs may be provided on each supporting element 2, but preferably a plurality of barbs 19 may be provided, and a plurality of barbs 19 may form one row or two rows. After the core holder has been introduced into the cavity, the barbs 19 may penetrate into the inner surface of the cavity as the holder 2 expands, securing the core holder, the outer surface of which conforms to the pre-hollowed cavity bore surface.
The specific size or shape of the components of the invention can be slightly changed, for example, the spherical crown surfaces of the supporting head 1 and the supporting piece 2 are not necessarily spherical crowns, but can be elliptical crowns, even planes or other shapes, and the invention can be well attached to the inner wall of the marrow cavity; the support head 1 and the support piece 2 can be connected in other hinging modes or in a flexible connection mode with elasticity, so that the function of the structure can be realized; the shape of the hanging hole 14 on the support 2 and the shape of the holding cross beam 6.2 can have various shapes (generally not completely round), and the functions of the hanging hole and the holding cross beam 6.2 can be realized as long as the holding cross beam 6.2 can be hooked on two compressed supports 2 and the supports 2 can be sprung out in proper positions; the connection mode between the clamping connecting rod 6.1 of the pushing device and the vertical rod of the clamping connector 6 can be fixed connection or movable connection, and the angle between the clamping cross beam 6.2 and the vertical rod of the clamping connector 6 can be changed by rotating the clamping connecting rod 6.1 during connection, so long as the clamping connecting rod 6.1 and the vertical rod of the clamping connector 6 can be locked, the angle relation between the marrow core supporter and the pushing rod during spring opening in a marrow cavity can be changed, and the device can adapt to surgical holes with different angles. Therefore, the replacement of the shape, the size or the connection mode on the basis of the invention belongs to the protection scope of the invention.
Claims (13)
1. A core support system, characterized by: the device comprises a marrow core supporter and a pushing device of the marrow core supporter, wherein the marrow core supporter comprises a supporting head (1) with a spherical crown type outer surface and supporting pieces (2) which are positioned at two sides of the supporting head (1) and can be sprung; the bottom end of the supporting piece (2) is provided with a hanging hole (14) which can enable the supporting piece to be hooked, the hanging hole (14) is a circular hole, the inner end of the circular hole is provided with a hooking boss (16), and the inner end of the hanging hole (14) is a strip hole or an elliptical hole;
the pushing device comprises a pushing rod (7), a clamping joint (6) for clamping the marrow core support is arranged at the top end of the pushing rod (7), and a jacking screw (8) which corresponds to the clamping joint (6) and is positioned on the side face of the clamping joint (6) after extending out is arranged along the length direction of the pushing rod; the clamping connector (6) comprises a vertical rod fixedly connected to the top end of the pushing rod (7), a clamping connecting rod (6.1) transversely arranged relative to the vertical rod is fixedly connected to the upper part of the vertical rod, and clamping cross beams (6.2) for hooking the marrow core support are arranged at two ends of the clamping connecting rod (6.1); the length direction of the clamping cross beam (6.2) forms a certain angle with the vertical rod of the clamping joint (6); the jacking screw rod (8) is positioned on the radial side surface of the clamping connecting rod (6.1), and the side surface of the clamping cross beam (6.2) is of a strip shape or an oval shape corresponding to the hanging hole (14) on the support piece of the marrow core support.
2. The core support system of claim 1, wherein: the supporting piece (2) is hinged at the bottom of the supporting head (1) in a bilateral symmetry way through the connecting rotating shaft (4), and the supporting piece (2) is opened through the spring (12).
3. The core support system of claim 2, wherein: the support piece (2) is hinged with the support head (1) through a connecting rotating shaft (4) and a rotating shaft seat (13) which is respectively arranged on the support piece (2) and on the support head (1), and the connecting rotating shaft (4) is inserted into shaft holes of the rotating shaft seats of the support piece (2) and the support head (1).
4. The core support system of any one of claims 2 or 3, wherein: the spring (12) is a torsion spring, an elastic sheet or an elastic wire; the spring (12) is supported between the two support members (2) when the spring (12) is an elastic sheet or an elastic wire.
5. The core support system of claim 1, wherein: the two sides of the bottom end of the supporting piece (2) are respectively provided with pushing and rotating bosses (15) which correspond to each other.
6. The core support system of claim 1, wherein: the surfaces of the supporting head (1) and the supporting piece (2) are respectively provided with a through hole (18) for placing active broken bones; the surfaces of the supporting head (1) and the supporting piece (2) are provided with micropores for bone marrow growth fusion.
7. The core support system of claim 6, wherein: the size of the micropores is 90 mu m-300 mu m.
8. The core support system of claim 1, wherein: the bottom of the support (2) is provided with a row of outwardly directed barbs (19).
9. The core support system of claim 1, wherein: the outer surfaces of the supporting head (1) and the supporting piece (2) are spherical crowns, and when the supporting piece (2) is opened, the outer surface of the supporting piece (2) is contacted with the outer surface of the supporting head (1) to form a spherical crown surface with smooth and gentle transition; the bottom end of the supporting piece (2) is positioned at a position smaller than the diameter of the medullary cavity at the lower part of the medullary cavity when the supporting piece is opened; the peripheral dimension of the two supporting pieces (2) is not larger than the outer circle dimension of the supporting head (1) when the supporting pieces (2) are compressed and folded.
10. The core support system of claim 1, wherein: the two jacking screws (8) are symmetrically arranged by taking the clamping joint (6) as a center.
11. The core support system of claim 1, wherein: the jacking screw rod (8) is arranged in a circular long hole which is positioned inside the pushing rod (7) and is opposite to the pushing rod in radial direction.
12. The core support system of claim 1, wherein: the outer end of the pushing rod (7) is fixedly connected with the limit handle (5), and the jacking screw rod (8) is connected with the limit handle (5) through threads; the tail end of the jacking screw rod (8) is provided with a knurled handle (11).
13. The core support system of claim 1, wherein: the diameter of the pushing rod (7) is not larger than the outer dimension of the marrow core supporter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711443117.7A CN107874824B (en) | 2017-12-27 | 2017-12-27 | Marrow core supporter and pushing device thereof |
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| CN201711443117.7A CN107874824B (en) | 2017-12-27 | 2017-12-27 | Marrow core supporter and pushing device thereof |
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| CN107874824A CN107874824A (en) | 2018-04-06 |
| CN107874824B true CN107874824B (en) | 2024-02-02 |
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| CN107874824A (en) | 2018-04-06 |
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