WO2019227859A1 - Support structure, prosthesis, and prosthesis system - Google Patents

Abstract

A support structure, a prosthesis, and a prosthesis system, to enhance the support strength of a prosthesis and ensure a stable and effective extension function of the prosthesis. The support structure comprises an extending member (21) and a blocking member (22). The extending member (21) comprises a body and a plurality of brim structures (2114) at a proximal end of the body. The plurality of brim structures (2114) extend outwards in a radial direction of the body into a limiting member (1), and the plurality of brim structures (2114) are also arranged in an axial direction of the body. The body has an inner cavity (2112) closed at one end, and the body is provided with a hollow structure (2113) at a position adjacent to the plurality of brim structures (2114). The blocking member (22) is a hollow structure open at both ends and is disposed in the inner cavity (2112) to cover the hollow structure (2113). When the plurality of brim structures (2114) generate heat, part of the limiting member (1) in contact with the plurality of brim structures (2114) softens, so as to eliminate the limiting of the limiting member (1) on the support structure.

Description

Support structure, prosthesis and prosthesis system Technical field

The invention relates to the technical field of medical devices, and in particular, to a support structure, a prosthesis, and a prosthesis system.

Background technique

In recent years, prolongable prosthesis has been widely used in limb salvage technology, especially in children with malignant bone tumor limb salvage technology, which can avoid secondary surgery and effectively reduce secondary trauma to patients, thus obtaining good Clinical efficacy.

At present, a variety of prolongable prosthesis structures are provided. For example, patent application CN107518961A discloses a magnetothermal prolongable prosthesis, which includes a magnetic generating control device for controlling the magnetic generating device to generate an alternating magnetic field. Under the action of the support, the boss of the support tube heats up and melts the limit structure, and furthermore, the support tube moves relative to the limit structure by the elastic force of the compression spring, thereby achieving the effect of non-contact extension. However, currently in clinical applications, there is a problem of misalignment of the support structure due to insufficient support force of the magnetothermal prolongable prosthesis. In addition, during the magnetic heating process, once the hot-melt material flows into the support tube cavity where the compression spring is located, the extension function of the compression spring may also be invalidated. A similar prolongable prosthesis structure can also be found in patent US2003 / 0032958A1, however this patent also has the same problems as CN107518961A.

Summary of the Invention

In view of this, the object of the present invention is to provide a support structure, a prosthesis, and a prosthesis system to solve one or more of the problems of insufficient support force of the existing prosthesis and failure of the extension function of the spring.

According to one aspect of the present invention, a support structure is provided for supporting a prosthesis, including an extension member and a blocking member;

The extension member includes a body and a plurality of brim structures located at a proximal end of the body; each of the brim structures extends radially outwardly of the body to extend into a limiting piece, and a plurality of the brim The structure is also arranged along the axial direction of the body;

The body has an inner cavity closed at the distal end, and the body is provided with a hollow structure at a position adjacent to a plurality of the brim structures; the blocking member is a hollow structure with open ends and is disposed in the inner cavity, For covering the hollow structure;

Wherein, when a plurality of the brim structures are heated, the contact portions of the stopper with the plurality of brim structures are melted, so as to release the stoppers from restricting the support structure.

Further, according to another aspect of the present invention, a prosthesis is provided, including a shell, a limiting member, an elastic member and the supporting structure, wherein:

The housing has a first open end at a distal end and a first closed end at a proximal end;

The limiting member is accommodated in the casing, and is configured to be at least axially relatively stationary with the casing;

The extension of the support structure is accommodated in the limiting member, and extends to the distal end of the housing, and is configured to remain relatively stationary at least circumferentially with the housing, and the extension of A plurality of the brim structures project into the limiting member;

The elastic member is partially accommodated in the inner cavity of the extension member, and one end of the elastic member extends to a distal end portion of the inner cavity, and the other end is from a proximal end portion of the inner cavity. Extending out to the proximal end of the housing or the stopper;

When an alternating magnetic field is applied to the outer side of the shell, a plurality of the brim structures heat up, and the portions where the stopper contacts the plurality of brim structures are melted, so that the elastic member is pushed by the elastic force. The extension piece moves to the distal end of the casing along the axial direction of the limiting piece.

Further, according to another aspect of the present invention, there is provided a prosthesis system including the prosthesis and an alternating magnetic field generating device, the alternating magnetic field generating device is configured to provide an alternating magnetic field, and The eaves structure generates heat under the action of a magnetic field.

Preferably, the brim structure has a tip portion to extend into the limiting member, the tip portion has a first included angle, and the first included angle is between 30 ° and 60 °.

Preferably, the first included angle is 45 °.

Preferably, the first included angle is defined by a side edge of the brim structure and a bottom edge, the bottom edge extends in a radial direction of the body, and the bottom edge and an axial direction of the body A second included angle is formed, and the second included angle is between 80 ° and 110 °.

Preferably, the second included angle is 90 °.

Preferably, the maximum diameter of one of the brim structures closest to the proximal end of the body is larger than the maximum diameter of the other brim structures.

Preferably, the maximum diameter of one of the brim structures closest to the proximal end of the body is 1.05 times the maximum diameter of the other brim structures.

Preferably, a plurality of the brim structures are connected end to end along the axial direction.

Preferably, a plurality of the brim structures are arranged at intervals in the axial direction.

Preferably, the hollowed-out structure includes a plurality of hollowed-out structures, wherein a part of the hollowed-out structures is located at least partially between adjacent hat brim structures.

Preferably, the body includes a connection portion, a support portion, and a heating portion in order from the distal end to the proximal end; the connection portion is used to connect an external member, and the inner cavity extends axially from the proximal end of the heating portion to The distal end of the support portion, wherein a plurality of the brim structures are disposed outside the heating portion, and the floor structure is located on an area of the heating portion adjacent to the support portion.

Preferably, the supporting structure further includes a prism member, a cross section of the prism member is polygonal, and the prism member is located at the connecting portion and / or the supporting portion.

Preferably, the inner cavity includes a reserved space segment, the inner diameter of the reserved space segment is greater than the inner diameter of the rest of the inner cavity, the blocking member is located in the reserved space segment, and the blocking The outer diameter of the piece matches the inner diameter of the reserved space segment.

Preferably, the number of cap structures is 2-8.

Preferably, the limiting member is a hollow structure with two ends open.

In summary, in the support structure, prosthesis, and prosthesis system provided by the present invention, by providing a plurality of cap structures at the proximal end of the extension of the support structure, and adding a blocking member in the inner cavity of the extension, the said A part of the material of the prosthesis restraint piece cut by the brim structure will not overflow into the inner cavity of the extension member for placing the elastic member, and can instead overflow between the brim structures, thereby increasing the strength of the brim structure, Improve the structural support of the prosthesis, while ensuring that the extension function of the prosthesis is stable and effective.

In a preferred embodiment, the brim structure has a tip portion protruding into the stopper, and a first included angle of the tip portion is between 30 ° and 60 °, and more preferably 45 °, within these angle ranges. The inner brim structure can provide better structural support, and can also ensure smooth movement of the extension.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded schematic view of a prosthesis according to an embodiment of the present invention;

2 is a schematic structural diagram of an extension piece according to an embodiment of the present invention;

3 is an assembly diagram of an extension member and an elastic member according to an embodiment of the present invention;

4 is a schematic axial sectional view of an extension member according to an embodiment of the present invention;

5 is a perspective view of a proximal end of an extension piece according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a stress of an extension member cooperating with a limit member and an external force under an embodiment of the present invention; FIG.

FIG. 7 is a schematic view of a force of an extension member cooperating with a limiting member and under an external force according to another embodiment of the present invention; FIG.

FIG. 8 is a drawing of a raw material stretching curve of a stopper according to an embodiment of the present invention.

In the picture:

Limiting piece-1; supporting structure-2; extension piece-21; blocking piece-22; elastic piece-3; connecting portion-211; supporting portion-212; heating portion-213; connecting hole-2111; inner cavity-2112 Hollow structure-2113; Hat eaves structure-2114; Reserved space section-2115; Pin hole-2116; Cutting tube section -1001; Material stacking tube section -1002.

Detailed ways

In order to make the objects, advantages and features of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and all use inaccurate proportions, which are only used to facilitate and clearly assist the description of the embodiments of the present invention.

As used in the present invention, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in the present invention, the term "or" is generally used in a meaning including "and / or" unless the content clearly dictates otherwise. In the present invention, "distal" and "distal" refer to the extensible side of the prosthesis; correspondingly, "proximal" and "proximal" are opposite to "distal" and "distal" The side.

The core idea of the present invention is to provide a support structure, a prosthesis and a prosthesis system, so as to solve the problems of insufficient support force of the existing prosthesis extension, failure of the spring extension function and the like.

To achieve the above idea, the present invention provides a support structure, the support structure includes an extension member and a blocking member; the extension member includes a body and a plurality of brim structures at a proximal end of the body; a plurality of the brim The structure extends outward in the radial direction of the body to extend into a limiting piece, and a plurality of the brim structures are also arranged along the axial direction of the body; the body has an inner cavity closed at the distal end, and The body is provided with a hollow structure at a position adjacent to a plurality of the hat eaves structures; the blocking member is a hollow structure with open ends and is disposed in the inner cavity to cover the hollow structure; wherein: when a plurality of When the brim structure heats up, the positions where the stopper is in contact with a plurality of the brim structure are melted to release the stopper from restricting the support structure.

Furthermore, the present invention also provides a prosthesis including the supporting structure, and the prosthesis further includes a shell, a limiting member, and an elastic member, wherein the shell has a first open end portion at a distal end and a proximal portion The first closed end of the end; the limiting member is accommodated in the housing, and is configured to maintain at least axial relative static with the housing; the extension of the support structure is accommodated in the housing In the stopper, extending to the distal end of the housing, and configured to maintain at least a relative circumferential staticness with the housing, and a plurality of the brim structures of the extension member project into the stopper; The elastic member is partially accommodated in the inner cavity of the extension member, that is, one end of the elastic member extends to a distal end portion of the inner cavity, and the other end passes through the blocking member from the inner portion. The proximal end of the cavity extends out to the proximal end of the housing or the limiter; when an alternating magnetic field is applied to the outside of the housing, a plurality of the brim structures heat up, causing the limit The parts contacting a plurality of the brim structures are melted, so that the elastic parts are Pushing force of the extension member along the axial direction of the stopper member, moves toward the distal end of the housing.

In addition, the present invention also provides a prosthesis system including the prosthesis and an alternating magnetic field generating device, the alternating magnetic field generating device is configured to provide the alternating magnetic field, that is, an alternating The variable magnetic field is generated by an alternating magnetic field generating device, which is a trigger for prosthesis extension of the present invention.

Specifically, by providing an alternating magnetic field on the outer side of the shell, that is, outside the human body, an eddy current is formed at the brim structure of the extension member under the action of the alternating magnetic field, and the heat generated by the eddy current makes the limiting member contact a plurality of the brim structures The melting of the part reduces the limiting effect of the limiting member on the supporting structure. The supporting structure is moved by the elastic member along the axial direction of the prosthesis to the distal end of the shell, that is, toward the false Extension outside the body. The prosthesis system of the present invention has a simple design structure, can provide higher support force during daily use, and has high reliability.

As shown in FIG. 1, an embodiment of the present invention provides a prosthesis. The prosthesis includes a shell, a limiting member 1, a supporting structure 2, and an elastic member 3. The supporting structure 2 includes an extension member 21 and a blocking member 22. For ease of description, the casing is not shown in the drawings, but those skilled in the art should be able to know how to implement the structure of the casing according to the prior art.

The limiter 1 is housed in the housing and is configured to maintain at least axial relative static with the housing. The limiter 1 is used to limit the support structure 2; the limiter The material of 1 is preferably a resin, more preferably a polyacetal resin, at least the distal end of the stopper 1 is open (preferably both ends are open), the support structure 2 is accommodated in the stopper 1, and The extension piece 21 extends to the outside of the distal end of the housing. Further, the extension piece 21 is configured to remain relatively stationary with the housing in the circumferential direction, so that the extension piece 21 cannot rotate at will relative to the housing.

As shown in FIG. 2, an embodiment of the present invention provides a support structure 2. The support structure 2 includes the extension member 21 and a blocking member 22. The extension member 21 includes a main body and a proximal end provided on the main body. A plurality of brim structures 2114 are arranged along an axial direction of the body. Wherein, any one of the brim structures 2114 extends outward in the radial direction of the body and projects into the limiting member 1. The “radial extension” here cannot be narrowly considered that the brim structure 2114 can only extend in a direction perpendicular to the axial direction of the body, but it should be broadly understood that the brim structure does not extend in the axial direction of the body. The extension piece 21 is an axially movable part relative to the shell. The extension piece 21 is used to release the restriction member 1 from the restriction by the heat generated by the plurality of brim structures 2114 to achieve the extension of the prosthesis.

In addition, the body of the extension piece 21 has a closed inner cavity 2112 (which is an internal structure, and is shown by dashed lines in FIGS. 2 and 3), and the body of the extension piece 21 is adjacent to a plurality of the brim A hollow structure 2113 is also provided at the part of the structure 2114 to prevent the body part from heating under the action of an alternating magnetic field. In addition, the blocking member 22 is located in the inner cavity 2112 to cover all the hollow structures 2113 on the body, and can prevent the hot-melt material generated by the heating of the stopper 1 from flowing into the inner cavity 2112 through the hollow structure 2113. Promote the hot-melt material to stay between the brim structures 2114, and provide sufficient support for the daily use of the prosthesis after condensation. Secondly, the blocking member 22 is also a hollow structure with open ends to allow the elastic member 3 to pass through.

Specifically, as shown in FIG. 3, the proximal end of the inner cavity 2112 of the extension member 21 is open but the distal end is closed, that is, the inner cavity 2112 is a blind hole extending from the proximal end to the distal end of the body. structure. In fact, the elastic member 3 is partially accommodated in the inner cavity 2112, that is, one end of the elastic member 3 extends to the distal end of the inner cavity 2112, and the other end passes through the blocking member 22 from the inner cavity. The proximal end portion of 2112 extends out and further extends to the proximal end portion of the housing, wherein the portion of the elastic member 3 in the extension member 21 is shown by dashed lines in the figure. At this time, the limiting member 1 may be a hollow structure with two ends open to allow the elastic member 3 to pass through its proximal end and connect with the shell. Alternatively, the limiting member 1 may be a hollow structure with a closed proximal end, and the proximal end of the elastic member 3 is connected to the closed end of the limiting member 1. The elastic member 3 is configured to provide an elastic force to the extension member 21, and a direction of the elastic force is directed to a distal end of the extension member 21. The elastic member 3 generally uses a spring, such as a spring made of a cobalt-chromium alloy material, and the length of the spring is not specifically limited, so as to provide sufficient elastic force.

The inventor has found that due to the complex movements of the human body, the forces on the support structure 2 are also relatively complicated. In brief, as shown in FIG. 6, when the force F1 applied to the support structure 2 by the outside of the prosthesis is greater than the elastic force F2 provided by the elastic member 3 to the support structure 2, the limit member 1 pairs the support structure. The direction of the acting force F3 provided by 2 is opposite to the direction of F1, that is, F1 = F2 + F3. Obviously, the stopper 1 at this time obviously provides a supporting force to the supporting structure 2. However, as shown in FIG. 7, when the force F1 exerted on the support structure 2 by the outside of the prosthesis is smaller than the elastic force F2 provided by the elastic member 3 on the support structure 2, the limit member 1 affects the support structure 2. The direction of the applied force F3 ′ is the same as the direction of F1, that is, F2 = F1 + F3 ′. At this time, the stopper 1 provides a blocking force to the support structure 2. Therefore, according to the magnitude of the acting force F1 exerted on the support structure 2 by the outside of the prosthesis, the limiter 1 can provide the supporting structure 2 with a supporting force in the same direction as the elastic force F2 or the elastic force F2. The blocking force in the opposite direction. It should be understood that the force provided by the limiter 1 on the support structure 2 refers to the force exerted by the limiter 1 on the brim structure 2114 on the extension member 21.

Therefore, when the prosthesis is extended, the patient lies flat on the surgical bed, and F1 can be approximately zero due to the limbs lying flat. At this time, an alternating magnetic field is applied to the brim structure 2114, and the stopper 1 corresponds to the brim structure At 2114, it becomes soft due to heat, so that the force F3 'exerted by the limiter 1 on the extension member 21 becomes smaller, thereby facilitating the elastic force to overcome the blockage of the limiter 1, and finally the extension member 21 in the elastic member 3 The elastic force F2 moves relative to the limiting member 1. In addition, during relative movement, the cap structure 2114 cuts the stopper 1 that is softened due to heat, thereby forming the cut pipe portion 1001 on the stopper 1.

In a traditional prosthesis, a part of the hot-melt material generated by the thermal melting of the limiter will overflow into the space between the extension and the limiter, and a part will flow into the inner cavity of the extension through the hollow structure and condense on the elastic member. , Affecting the expansion and contraction of the elastic member. In addition, the inventor also found that in the traditional prosthesis, when the prosthesis is extended, the supporting force exerted by the stopper 1 on the brim structure 2114 on the extension 21 is mainly provided by the cut tube portion 1001. achieve. However, in the traditional prosthesis, there is usually only one brim structure on the extension member, so that the support provided by the cut pipe portion of the stopper to the brim structure is insufficient.

For this reason, the present invention overcomes the above-mentioned defects by providing a plurality of cap structures 2114 along the axial direction on the body of the limiting member 1 and a blocking member 22 covering the hollow structure 2113 in the inner cavity 2112. Specifically, during the extension of the prosthesis, due to the role of the blocking member 22, the penetration of the hot-melt material into the inner cavity 2112 through the hollow structure 2113 is avoided, and the hot-melt material will in turn overflow into the material formed between the brim structures 2114 Stacked tube section 1002. This part of the material stacking pipe portion 1002 will provide the supporting force to the brim structure 2114 after condensing, and combined with the supporting force provided by the cut pipe portion 1001, the two will jointly increase the supporting force of the supporting structure 2 to solve a single brim structure The problem of insufficient support. At the same time, due to the installation of the blocking member 22, the hot melt material can also be prevented from flowing into the inner cavity 2112 of the extension member 21 through the hollow structure 2113 to condense on the elastic member, ensuring the normal expansion and contraction of the elastic member 3, and ensuring the extension of the prosthesis. Features.

The material of the blocking member 22 is preferably a heat-resistant material, so as to prevent the blocking member 22 from being melted or softened by heat and affecting its use.

As shown in FIG. 4, a reserved space section 2115 is provided at the proximal end of the inner cavity 2112, and the inner diameter of the reserved space section 2115 is larger than the inner diameter of the rest of the inner cavity 2112. The inner diameter of the reserved space segment 2115 matches the outer diameter of the blocking member 22 (such as an interference fit) to accommodate the blocking member 22. The inner diameter of the blocking member 22 allows the elastic member 3 to pass through and freely expand and contract with respect to it. Here, the axial length of the reserved space segment 2115 and the blocking member 22 is sufficiently long so that the blocking member 22 can cover all the hollow structures 2113. In the embodiment of the present invention, the axial length of the reserved space segment 2115 may be equal to the axial length of the heating portion 213 described below, but is not limited thereto, and is specifically determined according to the axial range in which the hollow structure 2113 is arranged.

Further, as shown in FIG. 2, the body of the extension member 21 includes a connecting portion 211, a supporting portion 212, and a heating portion 213 in order from the distal end to the proximal end, that is, the AB segment corresponds to the connecting portion 211, BC The segment corresponds to the support portion 212, and the CD segment corresponds to the heating portion 213. However, the ratio of the axial length of each part to the total length of the extension piece 21 is not specifically limited. Wherein, the connection portion 211 is used to connect external components (such as femoral embedding segments), for example, as shown in FIG. 2 and FIG. 3, the connection portion 211 is connected to the external component through a blind hole-type connection hole 2111, and the connection here The hole 2111 is also an internal structure and is shown by a dotted line in the figure. Preferably, the connecting portion 211 is also provided with a pin hole 2116 (the invisible portion is shown by a dotted line) penetrating perpendicularly to the connecting hole 2111. A pin is provided to fix the extension piece 21 to prevent the extension piece 21 from moving relative to an external member; the inner cavity 2112 runs through the support portion 212 and the heating portion 213, that is, the proximal end of the inner cavity 2112 from the heating portion 213 axially Extending to the distal end of the support portion 212, which is the proximal end of the connection portion 211; the brim structure 2114 is located on the outer periphery of the heating portion 213, and the hollow structure 2113 is located on the heating portion An area on 213 adjacent to the support portion 212.

Further, in order to prevent the extension piece 21 from rotating randomly with respect to the housing, the support structure 2 further includes a prism member, specifically, the body of the extension member 21 further includes the prism member, and the cross section of the prism member is polygonal, preferably Regular polygon. The prism member is located on at least one of the support portion 212 and the connection portion 211, that is, a cross-sectional (radial cross-section) shape of at least a portion of the body is configured into a prism shape. Obviously, the angular number of the prism shape here can be any natural number greater than 2, such as a triangle, a quadrangle, a pentagon, a hexagon, and the like. Correspondingly, the outer shell also has a partial cross-sectional shape that matches the shape of the prism member, so as to prevent the extension member 21 from rotating randomly relative to the outer shell.

Further, a plurality of the brim structures 2114 may be closely connected, that is, the head and tail are continuously arranged, and the heads and tails may be spaced apart, or further, as shown in FIGS. 4 and 5, a hollow structure 2113 may be provided between adjacent brim structures 2114. The hollow structures 2113 may be provided in the intervals between all the brim structures 2114, or the hollow structures 2113 may be provided in the intervals between a part of the brim structures. The arrangement of the hollow structure can effectively isolate the body, so that the brim structure generates heat, but the body does not generate heat, so that the heating of the limiter 1 is more concentrated. In this embodiment, the number of cap structures 2114 is preferably two to eight, and more preferably two.

In order to melt the contact portion between the stopper 1 and the brim structure 2114, the brim structure 2114 can smoothly move to the target position, and at the same time, there can be sufficient contact between the stopper 1 and the brim structure 2114 to achieve the limit The supporting effect of the piece 1 on the brim structure 2114 and the pressure of the elastic member 3 are shared. The shape of the longitudinal section (axial section) of the brim structure 2114 is designed as a polygon, and more preferably a quadrangle. Viewed from the angle shown in FIG. 4, the longitudinal cross-sectional shape (one side) of the brim structure 2114 is trapezoidal, preferably a right-angled trapezoid, but is not limited to a trapezoid, as long as it is a polygon.

As shown in FIGS. 4 and 5, the brim structure 2114 has a tip portion to extend into the limiting member 1. The tip portion has a first included angle α, and the first included angle α is preferably between 30 ° and 60 °, and more preferably 45 °. At this time, it can provide better support and ensure smooth movement of the extension member. . The first included angle α may be defined by a side edge and a bottom edge of the brim structure 2114, and the side edge is located at a distal end of the bottom edge, that is, the side edge is from the distal end toward the proximal end. Extending outward. The bottom edge extends substantially along the radial direction of the body. Similarly, the "radial extension" here also needs to be understood from a broad perspective, that is, the bottom edge does not necessarily extend strictly perpendicular to the axial direction. As long as it does not extend in the axial direction. In addition, a second included angle β is formed between the bottom edge and the axial direction of the body, the second included angle is used to define a radial extension direction of the brim structure, and the second included angle β is preferably at It is between 80 ° and 110 °, and more preferably 90 °. With this configuration, the brim structure has certain advantages in terms of uniform force, damage prevention, and easy processing.

Further, among the plurality of brim structures, the largest diameter of the brim structure 2114 closest to the proximal end of the body is preferably larger than the maximum diameter of the other brim structures, for example, about 1.05 times the maximum diameter of the other brim structures, in the prosthesis During the extension, the large diameter of a brim structure near the proximal end of the extension 21 can be used to further block the flow of the hot melt material to the proximal end, so that more material stacking tube portions 1002 can be obtained between the brim structure and the support structure 2 Can get enough support.

As shown in FIG. 8, a tensile curve of a raw material for preparing a stopper according to an embodiment of the present invention, wherein the raw material for the preparation is polyacetal material (POM), the abscissa is strain (%), and the ordinate is stress (MPa). , And the corresponding test temperature from top to bottom is -40 ° C, 23 ° C, 40 ° C, 60 ° C, 80 ° C. It can be seen from the figure that the limiting stress value of the polyacetal material is about 60Mpa at a room temperature of 23 ° C (the test method is based on the standard GB / T 22271.2-2008). In addition, as a comparison, the relationship between the load of the prolongable prosthesis with a single brim structure in the prior art CN107518961A and the extendable prosthesis with a double brim structure of the present invention and the stress resistance of the limiter 1 is shown in the following table (test The method is based on the standard GB / T7314-2017), in which the longitudinal section shapes of the brim structure 2114 of the prior art and the present invention are right-angled trapezoids, the first included angle α is 45 °, and the second included angle β is 90 ° The maximum outer diameter of the brim structure 2114 is 19 mm.

It can be seen from the table that, in the vicinity of the limit stress value of the polyacetal material of the stopper, the load that the prolongable prosthesis in this embodiment can withstand is 2-3 times that of the prior art. Therefore, the extendable prosthesis of the present invention can provide sufficient support.

In short, the support structure, prosthesis, and prosthesis system provided by the present invention have a simple design structure, which can provide a high support force in daily use, and the process of extending the prosthesis to the outside is stable and controllable, which overcomes the false in the prior art. The problem of poor body safety. The support structure 2 includes the extension member 21 and the blocking member 22. The extension piece 21 includes a main body and a plurality of hat eaves structures 2114 located at the proximal end of the body. The plurality of hat eaves structures extend outward in the radial direction of the body and extend into the stopper 1 so that the stopper 1 and the extension 21 It is fixed under normal circumstances and will not produce axial relative movement. When prolongation is required, an alternating magnetic field is applied to the prosthesis, and the brim structure generates heat to melt the stopper 1 in contact with the prosthesis. Then, under the action of elastic force, the extension 21 moves to the distal end, and the The extension member 21 is provided with a plurality of brim structures 2114 and a blocking member 22 is provided in the inner cavity 2112 to cover the hollow structure 2113, so that the material left by the cutting on the stopper 1 enters between the brim structures 2114 to increase support. The supporting force of the structure 2 prevents the material from overflowing into the inner cavity 2112 through the hollow structure 2113, and affects the expansion and contraction of the elastic member 3.

In summary, the above embodiments have described in detail the different configurations of the support structure, the prosthesis, and the prosthesis system. Of course, the present invention includes, but is not limited to, the configurations listed in the above embodiments. Any of the configurations provided in the above embodiments The content that is transformed on the basis of the model belongs to the scope protected by the present invention. Those skilled in the art can learn from the contents of the above embodiments.

The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention. Any changes and modifications made by those of ordinary skill in the art according to the above disclosure shall fall into the protection scope of the claims.

Claims (17)

A support structure for supporting a prosthesis, characterized in that it includes an extension member and a blocking member; The extension member includes a body and a plurality of brim structures located at a proximal end of the body; each of the brim structures extends radially outwardly of the body to extend into a limiting piece, and a plurality of the brim The structure is also arranged along the axial direction of the body; The body has an inner cavity closed at the distal end, and the body is provided with a hollow structure at a position adjacent to a plurality of the brim structures; the blocking member is a hollow structure with open ends and is disposed in the inner cavity, For covering the hollow structure; Wherein, when a plurality of the brim structures are heated, the contact portions of the stopper with the plurality of brim structures are melted, so as to release the stoppers from restricting the support structure. The support structure according to claim 1, wherein the brim structure has a tip portion to extend into the limiting member, the tip portion has a first included angle, and the first included angle is 30 ° ～ 60 °. The support structure according to claim 2, wherein the first included angle is 45 °. The support structure according to claim 2, wherein the first included angle is defined by a side edge and a bottom edge of the brim structure, and the bottom edge extends along a radial direction of the body, and A second included angle is formed between the bottom edge and the axial direction of the body, and the second included angle is between 80 ° and 110 °. The support structure according to claim 4, wherein the second included angle is 90 °. The support structure according to claim 1 or 2, wherein a maximum diameter of one of the brim structures closest to the proximal end of the body is larger than a maximum diameter of the other brim structures. The support structure according to claim 6, wherein the maximum diameter of one of the brim structures closest to the proximal end of the body is 1.05 times the maximum diameter of the remaining brim structures. The support structure according to claim 1 or 2, wherein a plurality of the brim structures are connected end to end along the axial direction. The support structure according to claim 1 or 2, wherein a plurality of the brim structures are arranged at intervals in the axial direction. The support structure according to claim 9, wherein the hollowed-out structure comprises a plurality of hollowed-out structures, wherein a part of the hollowed-out structures are located at least partially between adjacent hat brim structures. The support structure according to claim 1 or 2, wherein the body comprises a connecting portion, a supporting portion, and a heating portion in order from the distal end to the proximal end; the connecting portion is used to connect an external member, the inner portion The cavity extends axially from the proximal end of the heating portion to the distal end of the support portion, wherein a plurality of the brim structures are disposed outside the heating portion, and the hollow structure is located adjacent to the heating portion An area of the support portion. The support structure according to claim 11, wherein the support structure further comprises a prism member, a cross section of the prism member is polygonal, and the prism member is located at the connection portion and / or the support portion. The support structure according to claim 1 or 2, wherein the inner cavity includes a reserved space segment, an inner diameter of the reserved space segment is greater than an inner diameter of the remaining portion of the inner cavity, and the blocking member It is located in the reserved space section, and an outer diameter of the blocking member matches an inner diameter of the reserved space section. The support structure according to claim 1 or 2, further comprising 2 to 8 of the brim structures. A prosthesis, comprising a housing, a limiting member, an elastic member, and the supporting structure according to any one of claims 1-14, wherein: The housing has a first open end at a distal end and a first closed end at a proximal end; The limiting member is accommodated in the casing, and is configured to be at least axially relatively stationary with the casing; The extension of the support structure is accommodated in the limiting member, and extends to the distal end of the housing, and is configured to remain relatively stationary at least circumferentially with the housing, and the extension of A plurality of the brim structures project into the limiting member; The elastic member is partially accommodated in the inner cavity of the extension member, and one end of the elastic member extends to a distal end of the inner cavity, and the other end passes through the blocking member from the inner portion. The proximal end of the cavity extends out and extends to the proximal end of the housing or the stopper; When an alternating magnetic field is applied to the outer side of the shell, a plurality of the brim structures heat up, and the portions where the stopper contacts the plurality of brim structures are melted, so that the elastic member is pushed by the elastic force. The extension piece moves to the distal end of the casing along the axial direction of the limiting piece. The prosthesis according to claim 15, wherein the limiting member is a hollow structure with two ends open. A prosthesis system, comprising the prosthesis according to claim 15 or 16 and an alternating magnetic field generating device, wherein the alternating magnetic field generating device is used to provide an alternating magnetic field, and acts on the alternating magnetic field. The brim structure described below generates heat.

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