CN107518961B - Prosthesis and prosthesis system - Google Patents

Prosthesis and prosthesis system Download PDF

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Publication number
CN107518961B
CN107518961B CN201710714216.8A CN201710714216A CN107518961B CN 107518961 B CN107518961 B CN 107518961B CN 201710714216 A CN201710714216 A CN 201710714216A CN 107518961 B CN107518961 B CN 107518961B
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China
Prior art keywords
column
prosthesis
extension
shell
post
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CN107518961A (en
Inventor
陈齐欧
张立争
张劼
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Minimally Invasive Investment Holdings Ltd
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Shanghai Microport Medical Group Co Ltd
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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
    • A61F2/28—Bones
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/02—Prostheses implantable into the body
    • A61F2/30—Joints
    • A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
    • A61F2002/30003—Material related properties of the prosthesis or of a coating on the prosthesis
    • A61F2002/3006—Properties of materials and coating materials
    • A61F2002/30075—Properties of materials and coating materials swellable, e.g. when wetted
    • 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
    • A61F2002/30316—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
    • A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
    • A61F2002/30537—Special structural features of bone or joint prostheses not otherwise provided for adjustable
    • A61F2002/3055—Special structural features of bone or joint prostheses not otherwise provided for adjustable for adjusting length

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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

The invention provides a prosthesis and a prosthesis system, wherein the prosthesis comprises a shell, a limiting column, an extending column and an elastic part, wherein: the extension column is accommodated in the limit column and extends towards the far end of the shell, the extension column comprises a body and at least one boss positioned at the near end of the body, and the boss extends outwards along the radial direction of the body and extends into the limit column; when an alternating magnetic field is applied to the outer side of the shell, the boss of the extension column generates heat, so that the position of the limiting column in contact with the boss is melted, and the elastic part pushes the extension column to move along the axial direction of the limiting column and towards the far end of the shell. The prosthesis and the prosthesis system are stable and controllable in the prolonging process, only pushed by internal spring force without operation, harmless to human body, simple in design structure and capable of overcoming the problem of poor safety of the prosthesis in the prior art.

Description

Prosthesis and prosthesis system
Technical Field
The invention relates to the technical field of medical instruments, in particular to a prosthesis and a prosthesis system.
Background
The early amputation treatment of children with tumors, especially the distal-femoral and proximal-tibial osteosarcomas with high incidence rate, is slowly replaced by limb protection treatment, an endoprosthesis is required to be installed after the tumor is removed by an operation of the children, and the traditional limb protection treatment means mainly comprise autologous bone transplantation, allogeneic bone transplantation and common prosthesis replacement. However, as the child grows, the healthy limb of the child grows longer along with the body, and the prosthesis implanted side cannot grow normally due to the damaged epiphysis, which causes the problem that the limbs of the child are not long enough. This not only gives the patient an unsightly appearance, but also brings inconvenience to the life of the patient, and can cause a series of complications such as pelvic tilt, scoliosis, joint damage caused by abnormal stress, and the like.
In order to solve the problem of unequal lengths of the limbs of children after limb protection, the conventional extensible prostheses are divided into two types: the prosthesis is an invasive and extensible prosthesis, although the prosthesis can be extended, the designed extension mechanism can be completed only by performing secondary operations, if the prosthesis is exposed by the operations, the prosthesis with the internal structural formula is twisted by a special tool, the prosthesis needs to be extended by repeated operations, the postoperative complications of the infant are increased, time and labor are wasted, and the economic burden is increased. Another type of prosthesis is an automatic extendable prosthesis, such as a prosthesis with an internal power supply and an external power supply, which has a complex design structure, a high failure rate, a limited service life and an uncertain extension length, and the connection of the internal and external power supplies through subcutaneous tissue can cause some complications.
Therefore, there is a need to design a safe and non-invasive, extendable prosthesis and prosthesis system.
Disclosure of Invention
The invention aims to provide a prosthesis and a prosthesis system, which solve the problem that the existing prosthesis is not safe after being prolonged.
In order to solve the technical problem, the invention provides a prosthesis, which comprises a shell, a limiting column, an extending column, a limiting rotation piece and an elastic piece, wherein:
the housing having a first open end at a distal end and a first closed end at a proximal end;
the limiting column is accommodated in the shell and is configured to at least keep axial relative rest with the shell;
the extension column is accommodated in the limit column and extends towards the far end of the shell, the extension column comprises a body and at least one boss positioned at the near end of the body, and the boss extends outwards along the radial direction of the body and extends into the limit column;
the rotation limiting piece is accommodated in the shell and is used for limiting the rotation of the extending column;
the elastic piece is used for providing elastic force for the extension column so that the extension column moves towards the far end of the shell;
when an alternating magnetic field is applied to the outer side of the shell, the boss of the extension column generates heat, so that the position of the limiting column in contact with the boss is melted, and the elastic part pushes the extension column to move along the axial direction of the limiting column and towards the far end of the shell.
Optionally, in the prosthesis, at least the distal end of the extension column body is a prism, the rotation limiting member includes a rotation limiting column, the rotation limiting column is located at the distal end of the housing and configured to at least remain circumferentially relatively stationary with the housing, the rotation limiting column is provided with a first inner cavity, and at least part of the first inner cavity is matched with the distal end of the extension column to limit the extension column from rotating.
Optionally, in the prosthesis, the rotation limiting member further includes a plurality of first positioning pins, the rotation limiting post is adjacent to one end of the limiting post close to the first opening end, a plurality of axially extending pin holes are provided between an outer wall of the rotation limiting post and an inner wall of the housing, and each first positioning pin is inserted into one of the pin holes, so that the rotation limiting post and the housing are kept circumferentially relatively stationary.
Optionally, in the prosthesis, a plurality of axially extending grooves are circumferentially arranged on an outer wall of a distal end of the extension column body, and the rotation limiting member includes a plurality of second positioning pins, and the second positioning pins are fixed to an inner wall of the housing, extend radially inward, and are accommodated in the axial grooves.
Optionally, in the prosthesis, a plurality of axially extending grooves are circumferentially arranged on an inner wall of the distal end of the housing, and the rotation limiting member includes a plurality of second positioning pins, and the second positioning pins are fixed to an outer wall of the distal end of the extending column, extend radially outward, and are accommodated in one of the axially extending grooves of the housing.
Optionally, in the prosthesis, an outer wall surface of the body of the extension column near the distal end of the boss has a plurality of through grooves extending in an axial direction of the extension column.
Optionally, in the prosthesis, the limiting column is made of resin, and the melt volume flow rate of the resin is 20-50 cm310min, and the elastic modulus is 2.5-5 GPa.
Optionally, in the prosthesis, the resin is a polyacetal or polyethylene resin.
Optionally, in the prosthesis, the resin is a methylal resin or an acetal resin.
Optionally, in the prosthesis, the extending column is a hollow body having a second inner cavity, and a distal end of the extending column is provided with a second closed end;
the prosthesis further comprises an inner column, the inner column comprises an extension body and a base, the base of the inner column is adjacent to the first closed end of the shell, and the extension body is accommodated in the second inner cavity of the extension column and extends towards the direction of the second closed end;
the elastic piece is a compression spring and is sleeved on the extension body, the near end of the elastic piece is adjacent to the base, and the far end of the elastic piece is adjacent to the second closed end.
Optionally, in the prosthesis, the inner column further includes a magnetic conductive component, the magnetic conductive component is accommodated in the extension body of the inner column, and the magnetic conductive component has a relative magnetic permeability of 100 to 10000.
Optionally, in the prosthesis, the material of the magnetic conductive component is permanent ferrite.
Optionally, in the prosthesis, at least the material of the outer wall of the extension body is a biocompatible material.
Optionally, in the prosthesis, an inner wall of the elastic member is in clearance fit with an outer wall of the inner column, and the outer wall of the elastic member is in clearance fit with the second inner wall of the extension column.
Optionally, in the prosthesis, the prosthesis further includes a shell cap, the shell cap is located near the first opening end, the shell cap is detachably connected to the housing, so that the rotation limiting member and the limiting column are kept axially relatively stationary with respect to the housing, the shell cap has a through third inner cavity, and the extending column extends to the outer side of the housing through the third inner cavity.
Optionally, in the prosthesis, the first closed end of the shell has a bore therethrough.
The invention also provides a prosthesis system comprising a prosthesis according to any one of the above and an alternating magnetic field generating device which provides an alternating magnetic field.
Optionally, in the prosthesis system, the alternating magnetic field generating device includes a ring body and a generating device main unit, and the generating device main unit is configured to control the alternating magnetic field, and the prosthesis is placed in the ring body when the alternating magnetic field is provided.
In the prosthesis and the prosthesis system provided by the invention, an alternating magnetic field is arranged outside the shell, namely outside the human body, and the contact part of the limiting column and the extending column is melted, so that under the limitation of the limiting and rotating piece, the elastic body pushes the extending column to move towards the far end of the shell along the axial direction of the limiting column, namely to extend towards the outside of the prosthesis. Therefore, the extension process is stable and controllable, the extension is pushed only by using the internal spring force, the operation is not needed, the operation is not harmful to the human body, the design structure is simple, the extension length can be determined according to the action time and the frequency control of the alternating magnetic field, and the problem of poor safety of the prosthesis in the prior art is solved.
Specifically, the extension column comprises a body and a boss positioned at the near end of the body, the boss extends outwards along the radial direction of the body and extends into the limit column, so that the limit column and the extension column can be fixed under the conventional condition and cannot move randomly; under the action of the alternating magnetic field, the boss generates heat to melt the limiting column in contact with the boss, so that the extension column overcomes the resistance of the limiting column and moves to the far end under the action of the elastic piece.
In a preferred embodiment, the outer wall surface of the body of the extension column near the far end of the boss is provided with a plurality of through grooves extending along the axial direction of the extension column, so that the boss part generates heat rapidly under the action of an external alternating magnetic field, and the groove section is cut off because of a magnetic circuit loop generating eddy current, does not generate heat, and avoids the rest part of the prosthesis from being damaged by heat.
In a preferred embodiment, the body of the extending column, at least the outer wall surface of the distal end is prism-shaped, the rotation limiting component comprises a rotation limiting column at the distal end of the housing, and the first inner cavity of the rotation limiting column is matched with the shape of the outer wall of the distal end of the extending column. Further, the opposite surfaces of the outer wall of the rotation limiting column and the inner wall of the outer shell are provided with a plurality of axially extending pin holes, and each first positioning pin is inserted into one of the pin holes so that the rotation limiting column and the outer shell are kept relatively static in the circumferential direction. Therefore, the extending column and the shell are kept relatively static in the circumferential direction and cannot rotate randomly. In another embodiment, the outer wall of the distal end of the extending column body is circumferentially provided with a plurality of axially extending grooves, and the rotation limiting member comprises a plurality of second positioning pins, and the second positioning pins are fixed on the inner wall of the shell, extend radially inwards and are accommodated in the axial grooves. Or, a plurality of axially extending grooves are circumferentially arranged on the inner wall of the far end of the shell, the rotation limiting piece comprises a plurality of second positioning pins, and the second positioning pins are fixed on the outer wall of the far end of the extension column, radially extend outwards and are accommodated in an axial groove of the shell. Also, the extending column remains circumferentially stationary relative to the housing.
In a preferred embodiment, the limiting column is made of a material with a melt volume flow rate of 20-50 cm3A resin having an elastic modulus of 2.5 to 5GPa, preferably a polyacetal resin or a polyethylene resin, more preferably a methylal resin or an acetal resin. The resin material can provide enough mechanical property when the prosthesis is used at ordinary times so as to overcome the elastic force of the elastic part on the extending column, provide excellent fluidity when the prosthesis needs to be extended, and reduce the resistance on the extending column.
In a preferred embodiment, the prosthesis further comprises an inner column accommodated in the extension column, the inner column comprises a magnetic conductive component, the relative magnetic permeability of the magnetic conductive component is 100-10000, and preferably, the magnetic conductive component is made of permanent magnetic ferrite. In the extension process, under the action of an external alternating magnetic field, the magnetic conduction component can further enhance the field intensity of the alternating magnetic field, more efficiently promote the magnetic energy to be converted into electric energy and further into heat energy, so that the heating efficiency of the boss part of the extension column can be greatly improved, the action time of the alternating magnetic field is shortened, the extension agility is improved, and an efficient extension mechanism is ensured.
Drawings
FIG. 1 is a generally schematic view of a prosthesis according to one embodiment of the present invention;
FIG. 2 is a schematic axial cross-sectional view of a prosthesis according to an embodiment of the present invention;
FIG. 3 is a schematic view of the assembly of a prosthetic extension column and an inner column according to one embodiment of the present invention;
FIG. 4 is another schematic axial cross-sectional view of a prosthesis according to an embodiment of the invention;
shown in the figure: 10-a housing; 11-well; 21-a limiting column; 22-an extended column; 221-a boss; 222-a groove; 23-inner column; 24-limited rotation posts; 30-an elastic member; 41-a first locator pin; 50-shell cap; 60-femoral insertion segment; 70-tibial joint; 81-ring body; 82-generating device host.
Detailed Description
The prosthesis and the prosthesis system according to the invention are described in further detail below with reference to the figures and the embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
The term "distal" as used herein refers to the side of the prosthesis adjacent to the direction of extension; accordingly, "proximal" is the side opposite "distal" from "proximal" to "distal".
The core idea of the invention is to provide a prosthesis and a prosthesis system to solve the problem that the existing prosthesis is not safe after being lengthened.
In order to realize the idea, the invention provides a prosthesis and a prosthesis system, wherein the prosthesis comprises a shell, a limiting column, an extending column, a limiting rotation piece and an elastic piece, wherein: the housing having a first open end at a distal end and a first closed end at a proximal end; the limiting column is accommodated in the shell and is configured to at least keep axial relative rest with the shell; the extension column is accommodated in the limit column and extends towards the far end of the shell, the extension column comprises a body and at least one boss positioned at the near end of the body, and the boss extends outwards along the radial direction of the body and extends into the limit column; the rotation limiting piece is accommodated in the shell and is used for limiting the rotation of the extending column; the elastic piece is used for providing elastic force for the extension column so that the extension column moves towards the far end of the shell; when an alternating magnetic field is applied to the outer side of the shell, the boss of the extension column generates heat, so that the position of the limiting column in contact with the boss is melted, and the elastic part pushes the extension column to move along the axial direction of the limiting column and towards the far end of the shell.
In the prosthesis and the prosthesis system provided by the invention, an alternating magnetic field is arranged outside the shell, namely outside the human body, the alternating magnetic field is formed by an alternating magnetic field generating device, the alternating magnetic field generating device is a trigger for extending the prosthesis, the alternating magnetic field forms vortex on the boss part of the extending column, and the heat generated by the vortex melts the part of the limiting column, which is contacted with the boss, so that the elastic part 30 pushes the extending column to move to the far end of the shell along the axial direction of the limiting column, namely to extend to the outside of the prosthesis, the extension process is stable and controllable, the extension process is pushed only by internal spring force, no operation is needed, the prosthesis is harmless to the human body, and the design structure is simple.
The following embodiment is a prosthesis for lengthening a femur, but does not mean that the prosthesis of the present invention is applicable only to a prosthesis for lengthening a femur, and may be applied to a prosthesis for lengthening a tibia, a prosthesis for lengthening an ulna, and the like. As shown in fig. 1, an embodiment of the present invention provides a prosthesis including a housing 10, a position limiting column 21, an extending column 22, a rotation limiting column 24, and an elastic member 30. Wherein: the distal end of the housing 10 has a first opening, and the proximal end has a first closed end; the limiting column 21 is accommodated in the shell 10 and configured to at least keep axially relative static with the shell, and the limiting column 21 is used for limiting the extending column 22; the limit column 21 is a hollow columnar structure, the extension column 22 is accommodated in the limit column 21 and extends towards the outside of the far end of the shell, the extension column comprises a body and at least one boss positioned at the near end of the body, the boss extends outwards along the radial direction of the body and extends into the limit column 21, the extension column 22 is an extensible part relative to the shell 10, and the limit of the limit column 21 is released by utilizing the heat of the boss part so as to realize extension; the rotation limiting piece is accommodated in the shell and is used for limiting the rotation of the extending column; the elastic component 30 provides elastic force for the extension column, when the outer side of the shell 10 has an alternating magnetic field, the boss of the limit column 21 and the joint of the extension column 22 are melted, so that the elastic component 30 pushes the extension column 22 to move along the axial direction of the limit column at the far end of the shell. The housing 10 is the portion of the femoral box in an extendable femoral prosthesis, and the first closed end of the housing 10 is formed as a femoral joint in this embodiment, and is coupled to the tibial joint 70. The extension post is connected to the femoral insertion segment 60 and when extended, can drive the change in length of the femur.
Specifically, in the prosthesis, the extension column 22 includes a body and a boss 221 located at a proximal end of the body, where the boss 221 is a contact portion between the limiting column 21 and the extension column 22, and is a key point for limiting the extension column 22 by the limiting column 21. Viewed from the perspective shown in fig. 1, the boss extends radially outward from the body and into the retention post. It should be understood that "radially extending" herein should not be construed in a narrow sense as the boss extends only in a direction perpendicular to the axial direction of the body, but should be construed in a broad sense as the boss does not extend in the axial direction. In addition, in order to melt the contact portion between the position-limiting post 21 and the boss 221, the boss 221 can move smoothly to reach the target position, and at the same time, there is sufficient contact between the position-limiting post 21 and the boss 221 to realize the supporting function of the position-limiting post 1 on the boss 221 part and share the pressure of the elastic member 30, and the boss 221 is designed to be triangular, preferably right-angled triangular. From the perspective shown in fig. 2, in order to make the heat generation and the stress of the projection 221 uniform under the action of the alternating magnetic field, the cross-sectional shape of at least a portion of the projection 221 is preferably circular, but not limited to circular, as long as the shape curve of the projection profile is a curve with continuous second derivative. In addition, in order to make the extension post 22 move, the spacing post 21 can not hinder its removal, remove the boss with spacing post 21 is connected, the outer wall of extension post 22 body with the inner wall of spacing post 21 is clearance fit.
Further, as shown in fig. 1, in the prosthesis, the outer wall surface of the body of the extension column 22 near the boss 221 is provided with a plurality of grooves 222 extending along the axial direction of the extension column 22, so that under the action of an external alternating magnetic field, the boss 221 part generates heat rapidly, the grooves 222 cannot generate eddy current because part of or the whole loop through which the magnetic field passes is cut off, and therefore no heat is generated, and the generated heat is concentrated on the boss part, which plays a role in protecting the rest part of the extension column 22 and even the prosthesis. Preferably, the grooves 222 are axially uniformly arranged on the body. The extending column 22 is a hollow cylinder, and the groove 222 is a hollow structure. The number of grooves 222 and the size of the grooves 222 affect the effect of the targeted heating and the strength of the column extension 22, and the mechanical properties of the column extension 22 are affected by too many grooves 222 and too long axial distance. Therefore, the number and axial distance of the grooves 222 depend on the material of the extension column 22 and the thermal effect of the boss heating.
Further, in the prosthesis, the limiting column 21 is made of resin, and the melt volume flow rate (MVR) of the resin is 20-50 cm310min (test standard ISO1133), with an elastic modulus of 2500-. Preferably, the resin is polyacetal resin (polyacetal), polyethylene resin (polyethylene resin), and more preferably methylal (polyformaldehyde) or acetal (polyacetaldehyde). The polyacetal resin can be melted rapidly when heated, and has a certain fluidity after melting, when the elastic member 30 pushes the boss 221 to move, because the fluidity of the polyacetal resin after heating can reduce the resistance to the boss 221, when the heating is stopped, the boss 221 can be effectively fixed in time, and the extension column 22 can be further fixed. In the invention, the method for realizing the axial relative rest between the limiting column 21 and the shell 10 is not particularly limited, and can be clamping fixation, riveting fixation or assembly stress fixation. The outer wall of the limiting column 21 and the inner wall of the shell 10 can be in clearance fit.
In order that the column cannot rotate freely around the axis but only move axially, the prosthesis is also provided with a rotation limiting element. In this embodiment, the rotation restricting member includes a rotation restricting post 24. The rotation limiting post is located at the distal end of the housing and is configured to remain at least circumferentially stationary relative to the housing, the rotation limiting post being provided with a first lumen. The first cavity is at least partially prismatic in shape. It is clear that the number of corners of the prism shape here can be any natural number greater than 2, for example triangular, tetragonal, pentagonal, hexagonal, heptagonal, etc. The extension post 22 extends distally through the first lumen of the rotation limiting post 24. The far end of the extending column body is at least partially prismatic in shape, and the far end of the extending column body is matched with the first inner cavity. For example, as shown in fig. 4, the first lumen is octagonal, the distal end of the extension column 22 is also octagonal, and the size of the first lumen is equivalent to the distal end of the extension column 22. In this manner, the extension post 22 cannot rotate relative to the rotation limiting post 24. Further, the outer wall of the rotation limiting column 24 is matched with the inner wall of the housing 10, and a plurality of pin holes, for example, 4 pin holes arranged uniformly in the axial direction as shown in fig. 4, are formed between the outer wall of the rotation limiting column 24 and the inner wall of the housing 10. The number of the pin holes can be further adjusted according to actual needs. Each of the first positioning pins 41 is inserted into one of the pin holes. The far-end outer wall surface of the extension column 22 body is prism-shaped, the inner wall of the first inner cavity of the rotation limiting column 24 is matched with the outer wall shape of the extension column 22, and the rotation limiting column 24 and the shell 10 are kept static relatively in the circumferential direction, so that the extension column 22 cannot rotate freely relative to the shell 10.
In the prosthesis, as shown in fig. 1, the extending column 22 is a hollow body with a second inner cavity, and the distal end of the extending column is provided with a second closed end. The prosthesis further comprises an inner post 23, wherein: the inner column 23 comprises an extension body and a base, the base of the inner column 23 is adjacent to the first closed end of the housing, and the extension body of the inner column 23 is accommodated in the second inner cavity of the extension column 22 and extends towards the second closed end. At least the outer wall material of the extended body of the inner post 23 is a biocompatible material. Preferably, the polyether-ether-ketone material is selected, has good biocompatibility and has the capability of resisting chemical corrosion. As shown in fig. 1 and 3, in the prosthesis, the elastic element is a compression spring sleeved on the extension body, the proximal end of the elastic element 30 abuts against the base of the inner column 23, and the distal end of the elastic element 30 abuts against the second closed end of the extension column 22. The base of the inner post 23 is in close abutment with the first closed end by the pressure of the resilient member 30. The inner wall of the elastic member 30 is in clearance fit with the outer wall of the inner column 23, and the outer wall of the elastic member 30 is in clearance fit with the inner wall of the extension column 22, so that the elastic member 30 can be freely extended.
As shown in fig. 1 and 3, the AB section refers to the length of the extension body of the inner column 23, the CF section refers to the depth of the second cavity of the extension column 22, and the AF section refers to the length of the extension body of the inner column 23 extending into the second cavity of the extension column 22. Preferably, the length of the AB section is equal to the length of the CF section, i.e., the length of the extension body of the inner column 23 is equal to the depth of the second lumen of the inner wall of the extension column 22. In addition, the axial length of the limiting column 21 should be smaller than the free length of the compression spring 30, so that the compression spring 30 can apply elastic force to the extension column 22 in the whole life cycle of the prosthesis. Thus, when the extension body of the inner column 23 is fully inserted into the second inner cavity of the extension column 22, and the section AB coincides with the section CF, the elastic member 30 has the maximum elastic force. As the extension post 22 moves distally, the spring force provided by the compression spring 30 is reduced but still overcomes the resistance of the stop 21 after melting.
Further, the inner column 23 further comprises a magnetic conductive member, the magnetic conductive member is accommodated in the extension body of the inner column, the relative magnetic conductivity of the magnetic conductive member is 100-10000, and preferably, the magnetic conductive member is made of permanent magnetic ferrite. In the extension process of the prosthesis, under the action of an external alternating magnetic field, the magnetic conduction component can further enhance the field intensity of the alternating magnetic field, more efficiently promote the magnetic energy to be converted into electric energy and further converted into heat energy, so that the heating efficiency of the boss 221 part of the extension column 22 can be greatly improved, the action time of the alternating magnetic field is shortened, the extension agility is improved, and an efficient extension mechanism is ensured.
As shown in fig. 1, in the prosthesis, the prosthesis further includes a shell cap 50, the shell cap 50 is located at the first open end and is pressed on the rotation limiting column 24, and the shell cap 50 is detachably connected with the shell 10, such as a snap connection or a screw connection. The shell cap 50 has a third inner cavity, the third inner cavity is axially through, and the extension column 22 extends to the outer side of the shell. The limit column 21 is abutted with the first sealing end part, the limit rotating column 24 is abutted with the limit column 21, the shell cap 50 is tightly pressed on the limit rotating column 24 and is detachably connected with the shell 10, and the limit column 21, the limit rotating column 24 and the shell 10 can be kept axially and relatively static.
As shown in figure 1, the first closed end of the sheath 10 has an opening 11 to facilitate steam introduction through the opening 11 for sterilization, and the opening 11 provides air communication between the interior and exterior as the extension post 22 extends distally to maintain a balance of the differential pressures between the interior and exterior of the prosthesis during extension.
In other embodiments, the outer wall of the distal end of the extending column 22 is circumferentially provided with a plurality of axially extending grooves, and the rotation limiting member comprises a plurality of second positioning pins fixed to the inner wall of the distal end of the housing 10 and extending radially inward to be received in the axial grooves. In another embodiment, the inner wall of the distal end of the housing 10 is circumferentially provided with a plurality of axial grooves, and the rotation limiting member includes a plurality of second positioning pins, which are fixed to the outer wall of the distal end of the extending column 22 and extend radially outward and are accommodated in one axial groove of the housing 10.
In conclusion, in the prosthesis and the prosthesis system provided by the invention, the process of extending the prosthesis to the outside is stable and controllable, the prosthesis is pushed only by using the internal elastic part without an operation, no wound is caused to a human body, the design structure is simple, and the problem of poor safety of the prosthesis in the prior art is solved. The extension column 22 includes the body and is located body near-end boss, and the boss radially outwards extends along the body to extend into spacing post 21, can make spacing post 21 fixed under the circumstances at ordinary times with extension column 22, can not produce axial relative movement. When the extension is needed, an alternating magnetic field is applied to the prosthesis, the boss generates heat to melt the limiting column in contact with the boss, the extension column moves towards the far end under the action of elastic force, the outer wall of the extension column 22 body is provided with a groove, and under the action of the external alternating magnetic field, the groove 222 section is cut off because a loop of a magnetic circuit is generated, so that eddy current cannot be generated, and the rest part of the prosthesis is prevented from being damaged by heat.
The prosthesis of the present invention is part of a prosthesis system, as shown in fig. 1-2, the prosthesis system includes an elongated body, i.e., the prosthesis of the present invention, and an alternating magnetic field generating device, the alternating magnetic field being located outside the human body. Wherein the main components of the extension body include: the device comprises a shell 10, a limit column (such as a limit column 21), an extension column (such as an extension column 22), a rotation limit component (such as a rotation limit column 24, which is mainly used for limiting the rotation of the extension column 22), an elastic component (such as an elastic component 30), and the like; the alternating magnetic field generating device includes: a ring 81 and a generating device main unit 82. The ring body 81 includes a coil therein, and the generator unit 81 is configured to control parameters such as frequency, intensity, and time of the alternating magnetic field. In operation, the prosthesis is placed in the ring 81 and the generator unit 82 controls the alternating magnetic field. The alternating magnetic field generating device can be spaced to enable a boss (such as the boss 221) of the extension column in the extension main body to efficiently heat, so that the limiting column is locally melted, and the extension column can effectively and controllably extend out under the action of the elastic part; the design of the limiting column and the limiting rotating piece ensures that the extension is stable and reliable. The invention is suitable for external drive extension, is stable, reliable and efficient, and is particularly suitable for extending prostheses.
In summary, the above embodiments have been described in detail for the prosthesis and the prosthesis system, but it is understood that the present invention includes but is not limited to the configurations listed in the above embodiments, and any modifications based on the configurations provided by the above embodiments are within the scope of the present invention. One skilled in the art can take the contents of the above embodiments to take a counter-measure.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.

Claims (17)

1. A prosthesis, comprising a housing, a restraint post, an extension post, an inner post, a rotation restraint member, and an elastic member, wherein:
the housing having a first open end at a distal end and a first closed end at a proximal end;
the limiting column is accommodated in the shell and is configured to at least keep axial relative rest with the shell;
the extension column is accommodated in the limit column and extends towards the far end of the shell, the extension column comprises a body and at least one boss positioned at the near end of the body, and the boss extends outwards along the radial direction of the body and extends into the limit column; the extension column is a hollow body with a second inner cavity, and a second closed end part is arranged at the far end of the extension column;
the inner column comprises an extension body, a base and a magnetic conduction component, the base of the inner column is adjacent to the first closed end part of the shell, and the extension body is accommodated in the second inner cavity of the extension column and extends towards the direction of the second closed end part; the magnetic conduction component is accommodated in the extension body, and the relative magnetic permeability of the magnetic conduction component is 100-10000;
the rotation limiting piece is accommodated in the shell and is used for limiting the rotation of the extending column;
the proximal end of the elastic element is abutted with the base, and the distal end of the elastic element is abutted with the second closed end and used for providing elastic force for the extending column so as to enable the extending column to move towards the distal end of the shell;
when an alternating magnetic field is applied to the outer side of the shell, the boss of the extension column generates heat, so that the position of the limiting column in contact with the boss is melted, and the elastic part pushes the extension column to move along the axial direction of the limiting column and towards the far end of the shell.
2. The prosthesis of claim 1, wherein at least the distal end of the body of the extension post is prismatic and the rotation limiting member comprises a rotation limiting post at the distal end of the housing and configured to remain at least circumferentially stationary relative to the housing, the rotation limiting post having a first lumen at least a portion of which mates with the distal end of the extension post to limit rotational movement of the extension post.
3. The prosthesis of claim 2, wherein the rotation-limiting member further comprises a first plurality of retaining pins, the rotation-limiting post being adjacent an end of the rotation-limiting post adjacent the first open end, a plurality of axially extending pin holes being provided between an outer wall of the rotation-limiting post and an inner wall of the housing, each of the first retaining pins being inserted into one of the pin holes to retain the rotation-limiting post circumferentially stationary relative to the housing.
4. The prosthesis of claim 1, wherein the distal outer wall of the body of the extension column is circumferentially disposed with a plurality of axially extending recesses, and wherein the rotation limiting member includes a plurality of second locating pins secured to the inner wall of the housing and extending radially inwardly to be received in the axially extending recesses.
5. The prosthesis of claim 1, wherein the inner wall of the distal end of the housing is circumferentially disposed with a plurality of axially extending grooves, and the rotation limiting member includes a plurality of second alignment pins secured to the outer wall of the distal end of the extension post and extending radially outwardly to be received in one of the axially extending grooves of the housing.
6. The prosthesis of claim 1, wherein the outer wall surface of the body of the extension column near the distal end of the boss has a plurality of through grooves extending in the axial direction of the extension column.
7. The prosthesis according to claim 1, wherein the material of the limiting column is resin, and the melt volume flow rate of the resin is 20-50 cm310min, and the elastic modulus is 2.5-5 GPa.
8. The prosthesis of claim 7, wherein the resin is a polyacetal or polyethylene resin.
9. The prosthesis of claim 8, wherein the resin is a methylal resin or an acetal resin.
10. The prosthesis of claim 1, wherein the resilient member is a compression spring and is sleeved on the extension body.
11. The prosthesis of claim 1, wherein the magnetically permeable member material is permanent ferrite.
12. The prosthesis of claim 1, wherein at least the material of the outer wall of the extension body is a biocompatible material.
13. The prosthesis of claim 10, wherein the inner wall of the resilient member is in a clearance fit with the outer wall of the inner post, and the outer wall of the resilient member is in a clearance fit with the inner wall of the extension post.
14. The prosthesis of claim 2, further comprising a cap positioned adjacent the first open end, the cap being removably connected to the housing to retain the rotation limiting member and the post axially relative to the housing, the cap having a third lumen therethrough, the extension post extending through the third lumen to the outside of the housing.
15. The prosthesis of claim 1, wherein the first closed end of the shell has a bore therethrough.
16. A prosthesis system comprising a prosthesis according to any one of claims 1 to 15 and an alternating magnetic field generating device which provides an alternating magnetic field.
17. The prosthesis system of claim 16, wherein the alternating magnetic field generating device comprises a ring and a generating device body, the generating device body configured to control the alternating magnetic field such that the prosthesis is disposed in the ring when the alternating magnetic field is provided.
CN201710714216.8A 2017-08-18 2017-08-18 Prosthesis and prosthesis system Active CN107518961B (en)

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CN108261269B (en) * 2018-05-31 2018-08-28 上海微创医疗器械（集团）有限公司 Support structure, prosthesis and prosthesis system
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