CN212415993U

CN212415993U - Hip joint femoral stem, hip joint prosthesis and hip joint replacement system

Info

Publication number: CN212415993U
Application number: CN201921272567.9U
Authority: CN
Inventors: 高小超; 王经之; 鲍野
Original assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Current assignee: Tianjin Zhengtian Medical Instrument Co Ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2021-01-29
Anticipated expiration: 2029-08-07

Abstract

The utility model provides a hip joint femoral stem, hip joint false body and hip joint replacement system, hip joint femoral stem is provided with and beats the hole of pulling out of being connected with the femoral stem pulling out ware, beats and pulls out the hole and includes the ball nest hole and the locking hole that links to each other with the ball nest hole from near-end to distal end. When the hip joint femoral stem is matched with the femoral stem drawer, the beating and drawing angles of the hip joint femoral stem can be adjusted within a certain range, the matching degree of the hip joint femoral stem and the femoral stem drawer is improved, the operation is more convenient, and the damage of a locking hole can be avoided; the large rotor can be avoided, the small incision can be adapted, and the device is not required to be replaced when the small incision is punched in and pulled out.

Description

Hip joint femoral stem, hip joint prosthesis and hip joint replacement system

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to hip joint femoral stem, hip joint false body and hip joint replacement system.

Background

Joint replacement surgery is a common procedure in surgical medicine. The damaged natural joint is replaced and repaired by the artificial joint replacement operation, so that the physiological function of the joint is recovered, and the pain is relieved. Currently, artificial joint replacement surgery is an effective treatment method and is increasingly widely used.

There are about 200 million hip replacement surgeries worldwide each year, and this figure is still growing rapidly each year with the advent of an aging population structure, and at the same time, the number of hip revision surgeries is increasing day by day.

The hip revision surgery mainly comprises the revision of a hip joint femoral stem. The revision of the hip joint femoral stem needs to take out or drive in the femoral stem by using a femoral stem extractor. The structure of the prior hip joint femoral stem is difficult to be matched with the prior femoral stem extractor for use, which brings difficulty to the operation.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the hip joint femoral stem, the hip joint prosthesis and the hip joint replacement system are provided, when the hip joint femoral stem is matched with the femoral stem drawer, the beating and drawing angles of the hip joint femoral stem can be adjusted within a certain range, the matching degree of the hip joint femoral stem with the femoral stem drawer is improved, and the operation is more convenient.

To achieve the purpose, the utility model adopts the following technical proposal:

an object of the utility model is to provide a hip joint femoral stem, hip joint femoral stem is provided with and beats the hole of pulling out that is connected with the femoral stem pulling out ware, beats and pulls out the hole and includes the ball nest hole and the locking hole that links to each other with the ball nest hole from near-end to distal end.

Further, the ball hole is hemispherical.

Furthermore, the locking hole is a threaded hole, and threads are arranged on the outer surface of the locking piece.

Furthermore, a first light hole is formed between the ball socket hole and the locking hole.

Further, the hip joint femoral stem comprises a stem body distal end section, a stem body proximal end section, a neck and a conical head which are sequentially connected from a distal end to a proximal end, and the punching and pulling hole is formed in the neck.

Further, a plurality of rings of grooves are disposed around the proximal end section of the shank body.

Further, the handle body distal end section is in a conical shape gradually reducing from the proximal end to the distal end, the outer surface of the handle body distal end section is provided with a raised ridge, and the raised ridge extends from the proximal end of the handle body distal end section to the distal end of the handle body distal end section.

The second purpose of the utility model is to provide a hip joint prosthesis, which comprises an acetabular cup, a ball head and the hip joint femoral stem.

The third purpose of the utility model is to provide a hip joint replacement system, including the femoral stem extractor and the hip joint femoral stem as above, the femoral stem extractor includes the extracting head and the locking piece, the bottom of the extracting head is partially spherical or spherical, the extracting head is provided with a through hole passing through the bottom of the extracting head, the diameter of the through hole is larger than the diameter of the locking piece;

when the locking device is used for locking, the bottom of the beating and pulling head is positioned in the ball socket hole, the locking piece penetrates through the through hole to be matched with the locking hole, the hip joint femoral stem and the femoral stem beating and pulling device are locked, and a radial gap is formed between the locking piece and the through hole.

Furthermore, the through hole comprises a second unthreaded hole and a counter bore connected with the second unthreaded hole, and after the hip joint femoral stem is locked with the femoral stem extractor, part of the locking piece is positioned in the counter bore.

Compared with the prior art, the beneficial effects of the utility model are that:

the hip joint femoral stem and the hip joint prosthesis provided by the utility model can be adjusted in angle to a certain extent when being locked with the femoral stem extractor, can adapt to various open circuits and various body positions, improve the matching efficiency with the hip joint femoral stem and enable the operation to be more convenient;

the hip joint femoral stem and the hip joint prosthesis provided by the utility model are provided with the unthreaded hole between the ball socket hole and the locking hole, so that the locking hole of the hip joint femoral stem can be prevented from being damaged when the femoral stem punch-extractor is knocked, and in addition, the unthreaded hole plays a guiding role, so that the locking is smoother;

the utility model provides a femoral stem among the hip joint replacement system is beaten and is pulled out the ware and beat and to pull out the operation time and can avoid big rotor, adaptable little incision to can carry out effectual control, squeeze into and extract and need not change the apparatus, make the operation process more convenient.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Further features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, which is to be read in connection with the accompanying drawings, which are briefly described as follows. It is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic structural view of a hip stem provided in example 1;

fig. 2 is a schematic structural view of the femoral stem extractor provided in embodiment 1;

FIG. 3 is an enlarged view of a portion of the structure of FIG. 2;

fig. 4 is a schematic view of the connection between the hip joint femoral stem and the femoral stem extractor provided in example 1;

fig. 5 is a partial cross-sectional view of fig. 4.

Wherein:

1-hip joint femoral stem

11-handle body distal section, 12-handle body proximal section, 13-neck, 14-conical head, 15-pulling hole, 151-ball socket hole, 152-first light hole, 153-locking hole

2-femoral stem beating and pulling device

21-pulling head, 22-connecting handle, 23-handle, 24-first bending rod, 25-second bending rod, 26-through hole, 261-second light hole and 262-counter bore

3-locking piece.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

In the description of the present invention, it should be noted that "near end" refers to a position where an object is closer to an operator during a surgical operation, and "far end" refers to a position where the object is farther from the operator during the surgical operation.

When considering that hip joint femoral stem and femoral stem pull out the ware cooperation among the current hip joint replacement operation, beat the unable regulation of angle of pulling out and the femoral stem pull out the ware beat and pull out the screw thread in the hole of pulling out is beaten to the easy damage when hip joint femoral stem, the embodiment of the utility model provides a hip joint femoral stem, this hip joint femoral stem can be applied to in the joint replacement operations such as hip joint femoral stem implantation and revision, it is following right the embodiment of the utility model provides a carry out detailed introduction.

A hip joint femoral stem 1, the hip joint femoral stem 1 is provided with a beating and pulling hole 15 connected with a femoral stem beating and pulling device 2, and the beating and pulling hole 15 comprises a ball socket hole 151 and a locking hole 153 connected with the ball socket hole 151 from the near end to the far end.

The femoral stem beating and pulling device 2 which is a surgical instrument matched with the hip joint femoral stem 1 for use in operation comprises a beating and pulling head 21 and a locking piece 3, wherein the bottom of the beating and pulling head 21 is partially spherical or spherical, and the beating and pulling head 21 is provided with a through hole 26 penetrating through the bottom of the beating and pulling head 21;

during locking, the bottom of the striking head 21 is positioned in the ball socket hole 151, the locking piece 3 penetrates through the through hole 26 to be matched with the locking hole 153, the hip joint femoral stem 1 and the femoral stem striking and pulling device 2 are locked, and a radial gap is formed between the locking piece 3 and the through hole 26.

In the operation process, the femoral stem extractor 2 is matched with the extracting hole 15 of the hip joint femoral stem 1, the extracting hole 15 is a hole which extends from the outer surface of the femoral stem to the inner part of the femoral stem and is not through, the extracting hole 15 comprises a ball socket hole 151 and a locking hole 153, the ball socket hole 151 is used for accommodating the bottom of the femoral stem extractor 2 in a partial spherical shape or a spherical shape, the bottom of the femoral stem extractor 2 can be in a hemispherical shape or an 1/4 spherical shape, a 1/3 spherical shape and the like, the radius of the ball socket hole 151 is preferably in a hemispherical shape, generally, the radius of the ball socket hole 151 is 4-6mm, the ball socket hole 151 can be specifically arranged according to needs as long as the bottom of the partial spherical shape or the spherical shape of the femoral stem extractor 2 can be accommodated, and the bottom of the femoral stem extractor 2 can rotate; the locking hole 153 is used for matching with the locking piece 3 to lock the hip joint femoral stem 1 and the femoral stem extractor 2, and can contain different types according to the difference of the locking piece 3, such as a threaded hole when the locking part of the locking piece 3 is a threaded part; the locking hole 153 is arranged at one end of the ball socket hole 151 far away from the femoral stem extractor 2, namely the locking hole 153 is arranged in the inner layer of the hip joint femoral stem 1, when the femoral stem extractor 2 is inserted into the hip joint femoral stem 1, the locking hole 153 is firstly passed through the ball socket hole 151, and then the locking hole 153 can be reached to be locked and connected with the hip joint femoral stem 1.

In order to lock the femoral stem extractor 2 with the hip joint femoral stem 1, one part of the locking piece 3 is positioned in the through hole 26 of the femoral stem extractor 2, and the other part is positioned in the hip joint femoral stem 1; in order to adjust the pulling direction, a radial clearance is required between the locking member 3 and the through hole 26.

The bottom of the locking piece 3 and the through hole 26, which is provided with a radial gap, a ball socket hole 151 and the femoral stem extractor 2, is designed to be partially spherical or spherical and is mutually matched, so that the extracting direction can be adjusted within a certain range when the hip joint femoral stem 1 is matched with the femoral stem extractor 2, and the hip joint femoral stem extractor can adapt to various open circuits and body positions.

A first unthreaded hole 152 is further arranged between the ball socket hole 151 and the locking hole 153, generally, the height of the first unthreaded hole 152 is 1.5-2.5mm, and as the inner wall of the first unthreaded hole 152 is smooth and has no threads, knurling, wire drawing and the like, when the femoral stem extractor 2 enters the hip joint femoral stem 1 in the operation process, the femoral stem extractor can firstly pass through the first unthreaded hole 152, so that the situation that the femoral stem extractor 2 damages the threaded hole is effectively avoided. In addition, the unthreaded hole also plays a guiding role when the femoral stem extractor 2 is matched with a femoral stem, so that a screw can be smoothly screwed in, and the locking connection of the femoral stem extractor 2 and the hip joint femoral stem 1 is realized.

The hip joint femoral stem 1 comprises a stem body distal end section 11, a stem body proximal end section 12, a neck 13 and a conical head 14 which are connected in sequence from the distal end to the proximal end, and the punching and pulling hole 15 is arranged on the neck 13. Preferably, the hip femoral stem 1 is of an integral structure, and the punch and pull hole 15 is arranged at the junction position of the neck 13 and the stem body proximal end section 12.

A plurality of rings of grooves, such as 2, 4, 6, 7 or 10 rings, are preferably arranged in parallel around the proximal stem section 12, and the arrangement of the grooves is effective to slow down the subsidence of the hip stem 1. In order to further avoid the subsidence of the hip stem 1, the surface of the groove may be coated with a coating promoting osseointegration, such as a titanium layer or a hydroxyapatite coating.

The distal stem section 11 is tapered to taper from the proximal end to the distal end, and the taper of the tapered stem may range from 2 ° to 10 °, such as 3 °, 4 °, 5 °, 6 °, 7 °, 8 °, or 9 °, so as to better conform to the femur, preferably 5 °. Compared with the handle neck with other shapes, the handle body in the taper shape with gradually reduced diameter can be better contacted with a patient, and is beneficial to the driving in or pulling out of a doctor in the operation process.

The outer surface of the shank distal end section 11 is provided with a raised ridge extending from the proximal end of the shank distal end section 11 to the distal end of the shank distal end. Generally, the number of the ridges is a plurality, such as 3, 6, 8, 10 or 20, preferably the number of the ridges is 4-16, and preferably the cross section of each ridge is wedge-shaped. The arrangement of the convex ridge can reduce the rotation of the hip joint femoral stem 1 after being implanted in a patient.

The taper of the bit 14 may be 5 ° 42' 30 "as is commonly used in the art.

The utility model also provides a hip joint prosthesis, including acetabular cup, bulb and as above hip joint femoral stem 1.

The utility model also provides a hip joint replacement system, including the femoral stem is beaten and is pulled out ware 2 and the hip joint femoral stem 1 as above-mentioned, femoral stem is beaten and is pulled out ware 2 including beat and pull out head 21 and retaining member 3, beats and pulls out head 21 bottom and be partial sphere or sphere, beats and pulls out head 21 and is provided with the through-hole 26 that passes and beats the head 21 bottom, the diameter of through-hole 26 is greater than the diameter of retaining member 3;

Furthermore, the through hole 26 comprises a light hole and a counter bore 262 connected with the light hole, and after the hip joint femoral stem 1 is locked with the femoral stem extractor 2, part of the locking piece 3 is located in the counter bore 262.

Specifically, the femoral stem extractor 2 in the hip replacement system may be structured as follows:

a femoral stem punch 2 comprising: the locking piece 3 and a beating and pulling head 21 matched with the beating and pulling hole 15 of the hip joint femoral stem 1; the locking piece 3 and the beating and extracting head 21 are separated before the femoral stem beating and extracting device 2 beats and extracts the hip joint femoral stem 1, namely the locking piece 3 is not inserted into the beating and extracting head 21 before the operation;

in order to effectively match with the femoral stem, the bottom of the beating and pulling head 21 is partially spherical or spherical, so that the angle can be conveniently adjusted in the beating and pulling operation;

in order to be tightly connected with the femoral stem, a through hole 26 penetrating through the bottom of the beating and pulling head 21 is arranged on the beating and pulling head 21; preferably, the axis of the through hole 26 coincides with the axis of the bottom of the striking and drawing head 21;

the pulling hole 15 comprises a ball socket hole 151 and a locking hole 153 connected with the ball socket hole 151 in sequence from the proximal end to the distal end;

during locking, the bottom of the pulling head 21 is located in the ball socket hole 151, the locking piece 3 penetrates out of the through hole 26 to be matched with the locking hole 153, the hip joint femoral stem 1 and the femoral stem pulling device 2 are locked, a radial gap is formed between the locking piece 3 and the through hole 26, the locking piece 3 can adjust the angle in the bottom of the femoral stem pulling device 2 due to the arrangement of the shape of the bottom of the locking piece 3 and the shape of the ball socket hole 151 and the shape of the bottom of the pulling head 21, so that the femoral stem pulling device 2 can adapt to various open circuits and various body positions, the femoral stem can be pulled in and out of the femoral stem pulling device 2 which can use the same femoral stem pulling device 2, and operation steps are saved. The clearance can be achieved by setting the radial dimension of the through hole 26 larger than the radial dimension of the retaining member 3.

The locking part 3 comprises a locking screw, the locking hole 153 is a threaded hole, the locking screw comprises a nail head and a nail body, wherein the diameter of the nail head is larger than that of the nail body, and threads are arranged on the outer surface of the nail body for locking connection with the hip joint femoral stem 1. The locking screw can be replaced by other locking pieces 3 as long as the striking and pulling head 21 and the femoral stem can be fixed together, and the angle can be adjusted during locking.

The through hole 26 comprises a counter bore 262, the opening position of the counter bore 262 is usually at the bottom of the through hole 26, in addition, the size of the counter bore 262 is larger than the size of the nail head of the locking screw, after the femoral stem is locked and connected with the pulling head 21, the nail head of the locking screw is arranged in the counter bore 262, compared with the mode that the nail head protrudes to the outer side of the through hole 26, the connection stability can be enhanced after the nail head is arranged in the counter bore 262 after the locking.

Moreover, the through hole 26 further includes a second light hole 261, the second light hole 261 is disposed at one end of the counter bore 262 far away from the femoral stem, that is, the opening position of the second light hole 261 is usually at the middle or top of the through hole 26, and the locking screw can pass through the light hole first in the process of entering the counter bore 262, so that the bottom of the locking screw can be prevented from being damaged in the process of locking connection.

In addition, in order to enable a doctor to stably hold the femoral stem extractor 2 in the operation process, the femoral stem extractor 2 further comprises a handle 23 and a connecting handle 22, and it should be noted that the specific sizes and the like of the handle 23 and the connecting handle 22 can be flexibly set according to actual needs, for example, when the femoral stem matched with the handle 23 and the connecting handle 22 is an adult-sized femoral stem, the sizes of the handle 23 and the connecting handle 22 can be correspondingly set to be larger; when the femoral stem to which it is fitted is a child-sized femoral stem, the handle 23 and stem 22 may be sized accordingly to be smaller in size.

Specifically, the handle 23 is connected to one end of the connecting handle 22 away from the striking head 21, that is, the handle 23, the connecting handle 222 and the striking head 21 are arranged in sequence, and the handle 23 is away from the position of the hip femoral stem 1, so that the use by a doctor is facilitated. The handle 23 and the connecting handle 22 are detachably connected. Preferably, the handle 23 is in threaded connection with the connecting handle 22, so that when the handle 23 needs to be cleaned, the handle 23 can be conveniently detached from the connecting handle 22, and after cleaning is finished, the handle 23 is connected to the connecting handle 22 through threads, so that the cleaning tool is convenient and rapid. The connecting handle 22 and the striking head 21 are fixedly connected, so that the connection stability is further enhanced.

In addition, in order to facilitate the doctor to hold the femoral stem extractor 2 during the operation, the handle 23 is cylindrical, and compared with the handles 23 with other shapes, the cylindrical design is more suitable for the holding posture of the human hand, so that the doctor can more conveniently and flexibly operate the handle 23 during the operation. And, the outer surface of the handle 23 is provided with a plurality of anti-slip grooves, and the specific arrangement shape of the anti-slip grooves can be flexibly set according to the situation.

The shape and the like of the stem 22 will be explained below: in one embodiment, the stem 22 is arcuate. The arc design can effectively buffer the stress between the handle 23 and the beating and pulling head 21, so that the femoral stem can be more stable in the operation process of entering and pulling out a human body.

In another embodiment, the femoral stem extractor 2 further comprises a first bending rod 24 and a second bending rod 25, the first bending rod 24 is disposed between the handle 23 and the connecting handle 22, the second bending rod 25 is disposed between the connecting handle 22 and the extracting head 21, and it should be noted that the bending angles of the first bending rod 24 and the second bending rod 25 can be flexibly set according to the circumstances. The setting through above-mentioned first pole 24 and the second pole 25 of buckling can make handle 23 and connection handle 22 be approximate arc connection when connection handle 22 is the linear type, thereby can cushion handle 23 more and beat the atress between the head 21, and connection handle 22 is the design of arc and first pole 24 and the second pole 25 of buckling, can avoid the greater trochanter in operation process, make the adaptable little incision of this femoral stem drawer 2, and can effectually control, squeeze into and extract and need not change the apparatus.

Example 1

As shown in fig. 1-5, a hip joint replacement system comprises a hip joint femoral stem 1 and a femoral stem extractor 2;

the hip joint femoral stem 1 comprises a stem body distal segment 11, a stem body proximal segment 12, a neck 13 and a conical head 14 which are connected in sequence and are in an integral structure;

the neck 13 is provided with a pulling hole 15, the pulling hole 15 comprises a ball socket hole 151, a first unthreaded hole 152 and a locking hole 153 which are sequentially connected from the proximal end to the distal end, and the centers of the ball socket hole 151, the first unthreaded hole 152 and the locking hole 153 are axially overlapped; the ball holes 151 are hemispherical in this embodiment; the locking hole 153 is a threaded hole;

there are 10 parallel grooves around the shank body proximal section 12;

the handle distal section 11 is a taper shape gradually reducing from the proximal end to the distal end, the taper is 5 degrees, 4 ridges are arranged on the outer surface of the handle distal section 11, the ridges extend from the proximal end of the handle distal section 11 to the distal end of the handle distal section 11, and the cross section of each ridge is wedge-shaped;

the taper of the bit 14 is 5 "taper.

The femoral stem extractor 2 includes: the locking screw, and a handle 23, a first bending rod 24, a connecting handle 22, a second bending rod 25 and a striking head 21 which are connected in sequence;

the locking screw comprises a screw head and a screw body, the diameter of the screw head is larger than that of the screw body, and the outer surface of the screw body is provided with threads;

the striking and drawing head 21 is provided with a through hole 26, the bottom of the through hole 26 is hemispherical, the through hole 26 comprises a second unthreaded hole 261 and a counter bore 262, when the through hole is locked, the counter bore 262 is close to the femoral stem, the nail head is positioned in the counter bore 262, and the diameter of the counter bore 262 is larger than that of the nail head;

the handle 23 is cylindrical, and the outer surface of the handle 23 is provided with an anti-skid groove;

the handle 23 is in threaded connection with the first bending rod 24, the first bending rod 24 is in threaded connection with the connecting handle 22, and the connecting handle 22 is in threaded connection with the second bending rod 25; the second bending rod 25 and the striking head 21 are fixedly connected, such as integrated;

the axis of the handle 23 is not coincident with the axis of the stem 22, and is coincident with the axis of the through hole 26.

When locking, the bottom of the striking head 21 is positioned in the ball socket hole 151, the locking screw penetrates through the through hole 26 to be matched with the locking hole 153, the hip joint femoral stem 1 and the femoral stem striking and pulling device 2 are locked, and a radial gap is reserved between the locking screw and the counter bore 262.

Example 2

A hip joint replacement system comprises a ball socket hole 151 and a locking hole 153 which are connected in sequence from the near end to the far end except a drilling and pulling hole 15, the centers of the ball socket hole 151 and the locking hole 153 are axially overlapped, and the ball socket hole 151 is 1/3 spherical;

the taper of the shank distal section 11 is 2 °;

first bending rod 24, connecting handle 22 and second bending rod 25 are replaced by arc-shaped handles;

the rest of the structure is the same as that of the hip replacement system described in example 1.

Example 3

A hip joint replacement system comprises a ball socket hole 151 and a locking hole 153 which are connected in sequence from the near end to the far end except a drilling and pulling hole 15, the centers of the ball socket hole 151 and the locking hole 153 are axially overlapped, and the ball socket hole 151 is 1/4 spherical;

the taper of the shank distal section 11 is 10 °;

The method for driving or extracting the hip joint femoral stem 1 by using the femoral stem extractor 2 comprises the following steps: the bottom of the femoral stem extractor 2 is placed in the ball socket hole 151 of the hip joint femoral stem 1, then the locking piece 3 penetrates out of the through hole 26 of the femoral stem extractor 2 and is locked with the locking hole 153 of the hip joint femoral stem 1, so that the femoral stem extractor 2 and the hip joint femoral stem 1 are locked, and then the hip joint femoral stem 1 is driven into or extracted from the femur.

In conclusion, when the hip joint femoral stem 1 and the hip joint prosthesis are locked with the femoral stem extractor 2, the angle adjustment can be performed to a certain degree, the hip joint femoral stem extractor can adapt to various open circuits and various body positions, the matching efficiency with the hip joint femoral stem 1 is improved, and the operation is more convenient;

the first unthreaded hole 152 is arranged between the ball socket hole 151 and the locking hole 153 of the hip joint femoral stem 1 and the hip joint prosthesis, so that the locking hole 153 of the hip joint femoral stem 1 can be prevented from being damaged when the femoral stem extractor 2 is knocked, and in addition, the unthreaded hole plays a guiding role, so that the locking is smoother;

the femoral stem extractor 2 in the hip joint replacement system can avoid a large rotor during extracting operation, can adapt to a small incision, can be effectively held, and can be driven and extracted without changing instruments, so that the operation process is more convenient.

The basic principles and the main features of the invention and the advantages of the invention have been shown and described above, it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but that the invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A hip joint femoral stem is characterized in that the hip joint femoral stem is provided with a punching and pulling hole connected with a femoral stem punching and pulling device, and the punching and pulling hole comprises a ball socket hole and a locking hole connected with the ball socket hole from the near end to the far end.

2. The hip stem according to claim 1, wherein the ball socket hole is hemispherical.

3. The hip stem according to claim 1, wherein the locking hole is a threaded hole, and the outer surface of the locking member matching the locking hole is provided with a thread.

4. The hip stem according to claim 1 or 2, wherein a first light hole is further provided between the ball hole and the locking hole.

5. The hip femoral stem according to claim 1 or 2, comprising a stem body distal end section, a stem body proximal end section, a neck and a cone head connected in sequence from the distal end to the proximal end, wherein the punch hole is arranged in the neck.

6. The hip stem according to claim 5, wherein a multi-turn groove is provided around the proximal segment of the stem body.

7. The hip stem according to claim 5, wherein the stem body distal end section is tapered with a decreasing diameter from the proximal end to the distal end, and wherein the stem body distal end section outer surface is provided with ridges extending from the proximal end of the stem body distal end section to the distal end of the stem body distal end section.

8. A hip prosthesis comprising an acetabular cup, a ball head and a hip stem according to any one of claims 1 to 7.

9. A hip replacement system comprising a femoral stem drawer and a hip femoral stem according to any one of claims 1 to 7;

the femoral stem striking and pulling device comprises a striking and pulling head and a locking piece, wherein the bottom of the striking and pulling head is partially spherical or spherical, the striking and pulling head is provided with a through hole penetrating through the bottom of the striking and pulling head, and the diameter of the through hole is larger than that of the locking piece;

10. The hip replacement system according to claim 9, wherein the through hole comprises a second unthreaded hole and a counter bore connected to the second unthreaded hole, and after the hip stem is locked to the femoral stem extractor, part of the locking member is located in the counter bore.