CN111839837B

CN111839837B - Knee joint bone cement spacer mould

Info

Publication number: CN111839837B
Application number: CN202010658736.3A
Authority: CN
Inventors: 解凤宝; 史春宝; 吕昌禹; 王凯旋; 郝孟娟
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2021-12-10
Anticipated expiration: 2040-07-09
Also published as: CN111839837A

Abstract

The application relates to a knee joint bone cement spacer mould relates to the field of bone cement spacer preparation, and it is including femur spacer mould and shin bone spacer mould that are arranged in knee joint infection renovation operation. This application has the effect of making things convenient for knee joint spacer's preparation.

Description

Knee joint bone cement spacer mould

Technical Field

The application relates to the field of bone cement spacer preparation, especially relate to a knee joint bone cement spacer mould.

Background

In the bone joint prosthesis replacement operation, after the prosthesis is implanted, because the rejection reaction of a human body is inhibited, the resistance of the human body to infection is relatively reduced, and the infection of other parts of the body easily causes the infection of the operation part, so that the operation fails. The infection site may be caused by the growth of bacteria in the biofilm on the biomaterial surface of the metal implant, which are blocked from the body's defense system and antibiotics and cannot be killed unless the prosthesis is removed, and the infected lesion is difficult to remove. Therefore, after infection appears in the prosthesis replacement operation, the prosthesis needs to be taken out to completely remove the infection and to perform open placement of the joint cavity. Prosthesis replacement is resumed after the infection has been confirmed to be completely cleared. In the interval between prosthesis extraction and new prosthesis implantation, the bone cement spacer can prevent the osteotomy face from healing, maintain the tension of the ligament, release high-concentration antibiotics to eliminate infection sources, enable a patient to obtain a certain mobility, improve the comfort and improve the soft tissue healing.

Existing cement spacers include femoral and tibial cement spacers used in knee infection revision surgery.

However, the conventional knee joint bone cement spacer is manually manufactured, and the existing knee joint bone cement spacer mold is inconvenient to disassemble, which increases the work difficulty of medical workers, so how to provide a mold for manufacturing the knee joint bone cement spacer is a technical problem that needs to be solved by technicians in the field at present.

Disclosure of Invention

In order to make things convenient for knee joint bone cement spacer's preparation, the application provides a knee joint bone cement spacer mould.

The application provides a knee joint bone cement spacer mould adopts following technical scheme:

a knee joint bone cement spacer die comprises a femur spacer die and a tibia spacer die which are used in knee joint infection revision surgery;

the tibia spacer mould comprises a sleeve, a shaping support, a shaping cover, a tibia pouring port and a tibia buckle; the shaping support and the shaping cover are respectively arranged at two ends of the sleeve; the shaping cover is provided with a tibia pouring hole in a penetrating mode, and when the shaping cover is covered on the sleeve, the tibia pouring hole is communicated with the interior of the sleeve;

a tibia molding pipe is convexly arranged on the shaping cover, the tibia molding pipe is communicated with the tibia pouring hole, and the tibia pouring port is arranged on the tibia molding pipe;

the femur spacer mold comprises an upper end cover, a bottom support, a femur pouring gate, a demolding table and a buckle; the bottom support and the upper end cover are connected together through a femur buckle; the bottom support is provided with a bone cement containing tank, the upper end cover is provided with a push hole, and the demolding table is arranged in the push hole; the upper end cover is provided with a femur pouring hole in a penetrating way; when the upper end cover is covered on the bottom support, the femur pouring hole is communicated with the bone cement holding tank on the bottom support;

a femur forming tube is convexly arranged on the upper end cover and is communicated with the femur pouring hole, and the femur pouring port is arranged on the femur forming tube;

the demolding table is provided with a through hole in a penetrating mode, the push hole is communicated with the femur pouring hole, and the femur pouring hole is communicated with the through hole when the demolding table is installed in the push hole.

Through adopting above-mentioned technical scheme, when using shin bone spacer mould preparation shin bone spacer, the staff uses the clearance to measure the external member earlier and detects out the big or small shape of shin bone spacer that will make, then the staff will mould to hold in the palm and install in the sleeve, and according to the mounted position of fixture block, adjust moulding and hold in the palm and the mounting distance between moulding lid, then the staff uses the shin bone buckle to mould lid and muffjoint reinforcement, and install the shin bone sprue gate on the shin bone shaping pipe, then the staff pours bone cement into to the sleeve along the shin bone shaping pipe, accomplish bone cement's the injection process. After bone cement pours into and solidifies the shaping, the staff opens the shin bone buckle earlier, removes the connection between shaping lid and the sleeve, then promotes the shin bone sprue gate of installing on the shin bone forming tube, carries out the top to the shin bone spacer and moves, contacts the bonding between shaping lid and the shin bone spacer, later will mould the lid and take off from the sleeve, and the staff promotes moulding support again for moulding support is released the shin bone spacer from the sleeve.

When using thighbone spacer mould preparation thighbone spacer, the staff is installed the drawing of patterns platform in pushing away the hole, then the staff uses the thighbone buckle to connect upper end cover and collet to consolidate, then and install the thighbone sprue gate on the thighbone forming tube, the staff pours bone cement, the injection process of bone cement along the thighbone forming tube in to the bone cement holding tank of collet. After bone cement is injected and is solidified and molded, a worker firstly opens the femoral buckle, the connection between the upper end cover and the bottom support is removed, the femoral sprue gate is screwed inwards, the extrusion demolding table is separated from the upper end cover together with the femoral spacer, and then the complete femoral spacer is obtained by directly taking off the demolding table.

Preferably, the tibia sprue gate is in threaded connection with the tibia forming pipe; the femur pouring port is in threaded connection with the femur forming tube;

when the femur sprue gate is installed on the upper end cover, the femur sprue gate is abutted to the demolding table.

Preferably, the shaping support is arranged in the sleeve in a penetrating mode, and when the shaping support is arranged in the sleeve, the edge of the shaping support is attached to the inner wall of the sleeve.

Preferably, the shaping support is plate-shaped, and a reinforcing ring is arranged on the shaping support in a protruding mode along the circumferential direction of the edge of the shaping support.

Preferably, a plurality of clamping blocks which are uniformly arranged along the circumferential direction of the shaping support are fixedly connected to the shaping support, a plurality of groups of clamping grooves are formed in the sleeve in a penetrating mode, and when the shaping support is installed in the sleeve, the clamping blocks are inserted into the clamping grooves.

Preferably, each group of clamping grooves is formed in the sleeve in a plurality along the length direction of the sleeve.

Preferably, the cross-sectional shape of the fixture block is triangular, and when the shaping support and the shaping cover are installed on the sleeve, the surface of the fixture block facing one side of the shaping cover is an inclined surface, and the surface facing away from one side of the shaping cover is a plane.

Preferably, the fixture block is installed on the reinforcing ring, and the two sides of the position of the fixture block on the reinforcing ring are provided with adjusting grooves in a penetrating mode.

Preferably, the tibia buckle comprises a tibia clamping ring which is sleeved and fixedly connected to the sleeve, a plurality of tibia connecting plates which are fixedly connected to the peripheral surface of the plastic cover, a tibia mounting plate which is fixedly connected to the tibia clamping ring, and a tibia clamping plate which is used for connecting the tibia mounting plate and the tibia connecting plates together; when the sleeve and the shaping cover are installed together, the tibia mounting plate and the tibia connecting plate are butted together;

the femur buckle comprises a plurality of femur connecting plates which are sleeved and fixedly connected with the bottom support, an installation plate which is fixedly connected with the upper end cover, and a clamping plate which is used for connecting the installation plate and the connecting plates together; when the bottom support and the upper end cover are installed together, the installation plate and the connecting plate are butted together.

Preferably, the shaping cover is provided with a sleeve accommodating groove for accommodating a sleeve opening of the sleeve.

In summary, the present application includes at least one of the following beneficial technical effects:

1. by arranging the tibia spacer mold, compared with a spacer manually kneaded by a worker, the tibia spacer is manufactured by using the spacer mold, so that the tibia spacer can be manufactured more conveniently by the worker;

2. the thickness of the tibial tray spacer can be determined by adjusting the height of the shaping tray, so that the applicability of the tibial tray spacer is wider;

3. the material used by the knee joint spacer die can ensure that the die cannot be damaged and maintain the basic shape due to heat release of bone cement in the initial use process, slight deformation can occur after use, and the die is a disposable product, so the problem of die deformation can be not considered;

4. the structure of the spacer is similar to that of an XN knee joint prosthesis product, and the spacer can be stabilized without carrying out more treatment on the osteotomy surface;

5. the surface of the inner cavity of the mould is smooth, so that the bone cement can not be adhered to the mould when being solidified, and the demoulding is convenient.

Drawings

FIG. 1 is a schematic view of a tibial spacer mold of the present embodiment;

FIG. 2 is a schematic view of a shaping holder in the present embodiment;

FIG. 3 is a schematic view of the plastic cover of the present embodiment;

FIG. 4 is a schematic view of a tibial snap-gauge in accordance with an embodiment of the present invention;

FIG. 5 is a schematic view of the femoral spacer mold of this embodiment;

FIG. 6 is a schematic view of a femoral snap-gauge in accordance with the present embodiment;

FIG. 7 is an exploded view of the femoral spacer mold of this embodiment;

fig. 8 is a schematic view of the femoral sprue of the present embodiment.

Description of reference numerals: 1. a tibial spacer mold; 11. a sleeve; 12. shaping support; 13. a shaping cover; 14. a tibial sprue gate; 15. a tibia buckle; 151. a tibial snap ring; 152. a tibial junction plate; 153. a tibial mounting plate; 154. a tibia clamp plate; 1541. a tibial baseplate; 1542. a tibial splint; 155. the tibia is connected with the sliding chute; 156. a tibia mounting chute; 157. a tibial runner; 16. a reinforcement ring; 17. a clamping block; 18. an adjustment groove; 19. a card slot; 110. a tibial pour hole; 111. a sleeve receiving groove; 112. a tibial forming tube; 2. a femoral spacer mold; 21. an upper end cover; 22. a bottom support; 23. a femoral sprue gate; 24. a demolding table; 25. a femur buckle; 251. a femoral connecting plate; 252. a femoral mounting plate; 253. a femoral snap plate; 2531. a femoral baseplate; 2532. a femoral splint; 26. a bone cement holding tank; 27. a femoral sprue hole; 28. arranging a slot; 29. a femoral bone formation tube; 210. pushing the hole; 211. and (6) pushing the hole.

Detailed Description

The present application is described in further detail below with reference to figures 1-8.

The embodiment of the application discloses knee joint bone cement spacer mould. Referring to fig. 1 and 5, the cement spacer mold for the knee joint comprises a femur spacer mold 2, a tibia spacer mold 1 and a gap measurement kit matched with the femur spacer mold and the tibia spacer mold for use in knee joint infection revision surgery. The spacer die is obtained by heating and injection molding of a polypropylene material, has high heat resistance and chemical resistance, can be sterilized and is not damaged in the heat release stage when bone cement is solidified and molded. The mold is a disposable product, and even if the mold is slightly deformed when the bone cement releases heat, the mold has no influence.

Referring to fig. 1 and 2, the tibial spacer mold 1 includes a sleeve 11, a shaping tray 12, a shaping cap 13, a tibial sprue gate 14, and a tibial snap 15. The sleeve 11 is a straight cylinder, the section of the sleeve 11 is the same as that of the tibia spacer to be manufactured, and the tibia spacer is formed in the sleeve 11 through pouring and solidifying. The shaping holder 12 and the shaping cap 13 are disposed at both ends of the sleeve 11, respectively, and the shaping holder 12 and the shaping cap 13 close both ends of the sleeve 11.

The shaping support 12 is arranged in the sleeve 11 in a penetrating mode, and when the shaping support 12 is installed in the sleeve 11, the edge of the shaping support 12 is attached to the inner wall of the sleeve 11. The shaping support 12 is plate-shaped, and a reinforcing ring 16 is arranged on the shaping support 12 along the circumferential direction of the edge of the shaping support 12 in a protruding mode, and the reinforcing ring 16 is perpendicular to the shaping support 12. When the shaping support 12 is arranged in the sleeve 11 in a penetrating mode, the shaping support 12 and the reinforcing ring 16 are attached to the inner wall of the sleeve 11 together, the contact area of the shaping support 12 and the inner wall of the sleeve 11 is enlarged, and the sealing effect of the shaping support 12 on the sleeve 11 is increased.

The reinforcing ring 16 is fixedly connected with a latch 17, and the arrangement position of the latch 17 is positioned on the outer circumferential surface of the reinforcing ring 16. And a plurality of blocks 17 are arranged and uniformly distributed along the outer peripheral surface of the reinforcing ring 16. The cross section of the fixture block 17 is triangular, and when the shaping support 12 and the shaping cover 13 are installed on the sleeve 11, the surface of the fixture block 17 facing one side of the shaping cover 13 is an inclined surface, and the surface of the fixture block 17 facing away from one side of the shaping cover 13 is a plane. Adjusting grooves 18 are formed through the two sides of the position where the clamping blocks 17 are arranged on the reinforcing ring 16.

A plurality of sets of locking grooves 19 are formed through the sleeve 11, and when the shaping holder 12 is installed in the sleeve 11, the locking blocks 17 are inserted into the locking grooves 19. Each set of the locking grooves 19 is arranged on the sleeve 11 in a plurality along the length direction of the sleeve 11.

Wherein, set up fixture block 17 and draw-in groove 19, when moulding holds in the palm 12 and installs in sleeve 11, in fixture block 17 draw-in groove 19, and when the staff can hold in the palm 12 with moulding and promote to moulding lid 13 direction, shaping support 12 of being convenient for on the fixture block 17 advances to one side of moulding lid 13.

The shaping cover 13 is provided with a tibia pouring hole 110 in a penetrating mode, the shaping cover 13 is provided with a sleeve accommodating groove 111, the shape of the sleeve accommodating groove 111 is the same as that of the opening of the sleeve 11, when the shaping cover 13 is covered on the sleeve 11, the opening of the sleeve 11 is inserted into the sleeve accommodating groove 111, a step exists in contact between the shaping cover 13 and the sleeve 11, and the sealing degree of the shaping cover 13 to the opening of the sleeve 11 is increased. When the shaping cover 13 is covered on the sleeve 11, the tibia pouring hole 110 is communicated with the interior of the sleeve 11.

Referring to fig. 3 and 4, the tibia fastener 15 is disposed between the sleeve 11 and the shaping cover 13, and the tibia fastener 15 includes a tibia snap ring 151 sleeved on and fixedly connected to the sleeve 11, a plurality of tibia connection plates 152 fixedly connected to the circumferential surface of the shaping cover 13, a tibia mounting plate 153 fixedly connected to the tibia snap ring 151, and a tibia snap plate 154 for connecting the tibia mounting plate 153 and the tibia connection plate 152 together. The tibial snap-plate 154 includes a tibial base plate 1541 and two tibial splints 1542 vertically fixedly connected to the tibial base plate 1541, the two tibial splints 1542 being arranged in parallel. When the sleeve 11 and the shaping cap 13 are mounted together, the tibial mounting plate 153 and the tibial connection plate 152 are butted together.

Specifically, installing the shaping lid 13 on the sleeve 11, the staff aligns the shin bone connecting plate 152 on the shaping lid 13 with the shin bone mounting plate 153 on the sleeve 11 earlier, then the staff installs the shaping lid 13 on the sleeve 11, make shin bone mounting plate 153 and shin bone connecting plate 152 dock together, then the staff connects shin bone cardboard 154 joint on shin bone connecting plate 152 and shin bone mounting plate 153, make two shin bone splint 1542 on the shin bone cardboard 154 carry out the centre gripping to shin bone mounting plate 153 and shin bone connecting plate 152, realize the connection between shaping lid 13 and the snap ring, thereby accomplish the arrangement of shin bone buckle 15, and then accomplish the shin bone buckle 15 to the reinforcement between shaping lid 13 and the sleeve 11.

In addition, a tibia connection sliding groove 155 is formed in the tibia connection plate 152, a tibia installation sliding groove 156 is formed in the tibia installation plate 153, and when the tibia installation plate 153 is in butt joint with the tibia connection plate 152, the tibia connection sliding groove 155 and the tibia installation sliding groove 156 are located on one side, away from the butt joint position, of the tibia installation plate 153 and the tibia connection plate 152; and the tibia slide bars 157 which are respectively connected with the tibia connecting slide grooves 155 and the tibia mounting slide grooves 156 in a sliding manner are convexly arranged on the two tibia splints 1542.

When the tibial clamping plate 154 is installed on the tibial installation plate 153 and the tibial connecting plate 152, the tibial sliding strip 157 slides into the tibial installation sliding groove 156 and the tibial connecting sliding groove 155 to limit the tibial clamping plate 154 from transversely separating from the tibial installation plate 153 and the tibial connecting plate 152, and the connection strength of the tibial clamping plate 154 is increased.

A tibia forming pipe 112 is convexly arranged on one side, which is deviated from the sleeve accommodating groove 111, of the shaping cover 13, the tibia pouring port 14 is in threaded connection with the tibia forming pipe 112, and an internal thread is formed in the pouring pipe. When the tibial pour port 14 is installed on the tibial molding tube 112, the inner wall of the tibial pour port 14 is flush with the inner wall of the tibial molding tube 112 and covers the internal threads on the tibial molding tube 112. Wherein, when the tibial sprue gate 14 is mounted on the tibial forming tube 112, the tibial sprue gate 14 transitions flush with the tibial forming tube 112.

When using shin bone spacer mould 1 preparation shin bone spacer, the staff uses the clearance to measure the external member earlier and detects out the shin bone spacer size and shape of wanting the preparation, then the staff installs moulding support 12 in sleeve 11, and according to the mounted position of fixture block 17, adjust the mounting distance between moulding support 12 and the moulding lid 13, then the staff uses shin bone buckle 15 to connect moulding lid 13 and sleeve 11 and consolidate, and install shin bone sprue gate 14 on shin bone forming tube 112, then the staff pours bone cement into to sleeve 11 along shin bone forming tube 112, accomplish the injection process of bone cement. After bone cement is injected and solidified, a worker firstly opens the tibia buckle 15, removes the connection between the shaping cover 13 and the sleeve 11, then pushes the tibia sprue gate 14 installed on the tibia forming pipe 112, pushes the tibia spacer, removes the bonding between the shaping cover 13 and the tibia spacer, then takes the shaping cover 13 off the sleeve 11, and pushes the shaping support 12, so that the shaping support 12 pushes the tibia spacer out of the sleeve 11. Wherein the tibial spacer is formed in the tibial forming tube 112 and the sleeve 11.

Referring to fig. 5, the femoral partial spacer includes an upper end cap 21, a shoe 22, a femoral sprue 23 (see fig. 8), a stripper table 24 (see fig. 7), and a femoral snap 25. The bottom support 22 and the upper end cover 21 are connected together through a femoral snap 25.

Specifically, referring to fig. 5 and 7, the bottom plate 22 is provided with a bone cement receiving groove 26 for receiving bone cement.

Run through on upper end cover 21 and seted up thighbone sprue gate 27, and seted up arrangement groove 28 on upper end cover 21, the shape of arrangement groove 28 is the same with the notch shape of bone cement holding tank 26 on collet 22, when establishing upper end cover 21 lid on collet 22, the notch of bone cement holding tank 26 inserts in arrangement groove 28 on collet 22 for there is the ladder in the contact between upper end cover 21 and the collet 22, increases the degree of closure of upper end cover 21 to the notch of bone cement holding tank 26 on collet 22. When the upper end cover 21 is covered on the bottom support 22, the femur pouring hole 27 is communicated with the bone cement accommodating groove 26 on the bottom support 22.

Referring to fig. 5 and 6, the femoral clasp 25 is disposed between the shoe 22 and the upper end cap 21, the femoral clasp 25 including a plurality of femoral connecting plates 251 fixedly connected to the shoe 22, a femoral mounting plate 252 fixedly connected to the upper end cap 21, and a femoral catch plate 253 for connecting the femoral mounting plate 252 and the femoral connecting plates 251 together. The femur clamping plate 253 comprises a femur base plate 2531 and two femur clamping plates 2532 vertically and fixedly connected to the femur base plate 2531, wherein the two femur clamping plates 2532 are arranged in parallel. When the shoe 22 and the upper end cap 21 are mounted together, the femur mounting plate 252 and the femur connecting plate 251 are butted together.

Specifically, installing upper end cover 21 on collet 22, the staff aligns femur connecting plate 251 on collet 22 with the mounting panel on upper end cover 21 earlier, then the staff installs upper end cover 21 on collet 22, make femur mounting panel 252 and femur connecting plate 251 dock together, then the staff with the joint of femur cardboard 253 on femur connecting plate 251 and femur mounting panel 252, make two femur splint 2532 on femur cardboard 253 carry out the centre gripping to femur mounting panel 252 and femur connecting plate 251, realize the connection between upper end cover 21 and the collet 22, thereby accomplish the arrangement of thighbone buckle 25, and then accomplish the reinforcing of thighbone buckle 25 between upper end cover 21 and collet 22.

A femur forming tube 29 is convexly arranged on one side of the upper end cover 21 departing from the arrangement groove 28, the femur pouring port 23 is in threaded connection with the pouring tube, and an internal thread is formed on the pouring tube. When the femoral sprue 23 is mounted on the femoral molding tube 29, the inner wall of the femoral sprue 23 is flush with the inner wall of the femoral molding tube 29 and covers the internal threads on the femoral molding tube 29. Wherein, when the femur pouring opening 23 is installed on the femur molding pipe 29, the femur pouring opening 23 is in flush transition with the femur molding pipe 29.

A push hole 210 is formed in the upper end cap 21, the push hole 210 communicates with the femoral stem opening 23, and the demolding table 24 is installed in the push hole 210. The demoulding table 24 is arranged at the push hole 210 of the upper end cover 21 and is completely pressed in, then the femur pouring port 23 is screwed in to just contact with the demoulding table 24, and then the femur buckle 25 is clamped after the upper end cover 21 is buckled with the bottom support 22, so that bone cement can be poured. After the cement is completely solidified, the femur fastener 25 can be removed, the upper end cover 21 and the bottom support 22 are separated, and the femur fastener is continuously screwed into the femur pouring port 23 to press the demoulding table 24 so as to separate the femur partial spacer from the mould.

Wherein, be provided with the recess on the drawing of patterns platform 24, the recess designs into to leak hopper-shaped, makes bone cement pouring position and spacer contact position more tiny, and it is more convenient to get rid of unnecessary bone cement.

When using thighbone spacer mould 2 preparation thighbone spacer, the staff installs demolding platform 24 in pushing away hole 210, then the staff uses thighbone buckle 25 to connect upper end cover 21 and collet 22 and consolidate, then and install thighbone sprue 23 on thighbone forming tube 29, and the staff pours bone cement along thighbone forming tube 29 to the cement holding tank 26 of collet 22 in, accomplishes the injection process of bone cement. After the bone cement is injected and solidified and molded, a worker firstly opens the femur buckle 25, removes the connection between the upper end cover 21 and the bottom support 22, screws the femur sprue gate 23 inwards, extrudes the demoulding table 24 to separate the femur spacer from the upper end cover 21, and then directly takes off the demoulding table 24 to obtain the complete femur spacer.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a knee joint bone cement spacer mould which characterized in that: comprises a femur spacer mold (2) and a tibia spacer mold (1) which are used in knee joint infection revision surgery;

the tibia spacer mould (1) comprises a sleeve (11), a shaping support (12), a shaping cover (13), a tibia sprue gate (14) and a tibia buckle (15); the shaping support (12) and the shaping cover (13) are respectively arranged at two ends of the sleeve (11); the plastic cover (13) is provided with a tibia pouring hole (110) in a penetrating way, and when the plastic cover (13) is covered on the sleeve (11), the tibia pouring hole (110) is communicated with the interior of the sleeve (11);

a tibia forming pipe (112) is convexly arranged on the plastic cover (13), the tibia forming pipe (112) is communicated with the tibia pouring hole (110), and the tibia pouring port (14) is arranged on the tibia forming pipe (112);

the femur spacer mold (2) comprises an upper end cover (21), a bottom support (22), a femur pouring port (23), a demolding table (24) and a femur buckle (25); the bottom support (22) and the upper end cover (21) are connected together through a femur buckle (25); the bottom support (22) is provided with a bone cement accommodating groove (26), the upper end cover (21) is provided with a push hole (210), and the demolding table (24) is arranged in the push hole (210); a femur pouring hole (27) is arranged on the upper end cover (21) in a penetrating way; when the upper end cover (21) is covered on the bottom support (22), the femur pouring hole (27) is communicated with the bone cement accommodating groove (26) on the bottom support (22);

a femur forming tube (29) is convexly arranged on the upper end cover (21), the femur forming tube (29) is communicated with the femur pouring hole (27), and the femur pouring port (23) is arranged on the femur forming tube (29);

a through hole is formed in the demolding table (24) in a penetrating mode, the push hole (210) is communicated with the femur pouring hole (27), and when the demolding table (24) is installed in the push hole (210), the femur pouring hole (27) is communicated with the through hole;

the shaping support (12) is of a plate shape, and a reinforcing ring (16) is arranged on the shaping support (12) in a protruding mode along the circumferential direction of the edge of the shaping support (12);

the shaping support (12) is fixedly connected with a plurality of clamping blocks (17) which are uniformly arranged along the circumferential direction of the shaping support (12), a plurality of groups of clamping grooves (19) are formed in the sleeve (11) in a penetrating mode, and when the shaping support (12) is installed in the sleeve (11), the clamping blocks (17) are inserted into the clamping grooves (19);

a plurality of clamping grooves (19) are arranged on the sleeve (11) along the length direction of the sleeve (11);

the cross section of the fixture block (17) is triangular, and when the shaping support (12) and the shaping cover (13) are installed on the sleeve (11), the surface of the fixture block (17) facing one side of the shaping cover (13) is an inclined surface, and the surface of the fixture block facing away from one side of the shaping cover (13) is a plane;

the fixture block (17) is installed on the reinforcing ring (16), and adjusting grooves (18) are formed in the two sides of the position, where the fixture block (17) is arranged, of the reinforcing ring (16) in a penetrating mode.

2. The cement spacer for knee joint mold according to claim 1, wherein: the tibia sprue gate (14) is in threaded connection with a tibia forming pipe (112); the femur pouring port (23) is in threaded connection with a femur forming tube (29);

when the femur pouring gate (23) is installed on the upper end cover (21), the femur pouring gate (23) is abutted to the demolding table (24).

3. The cement spacer for knee joint mold according to claim 1, wherein: the shaping support (12) penetrates through the sleeve (11), and when the shaping support (12) is installed in the sleeve (11), the edge of the shaping support (12) is attached to the inner wall of the sleeve (11).

4. The cement spacer for knee joint mold according to claim 1, wherein: the tibia buckle (15) comprises a tibia clamping ring (151) which is sleeved and fixedly connected to the sleeve (11), a plurality of tibia connecting plates (152) which are fixedly connected to the peripheral surface of the plastic cover (13), a tibia mounting plate (153) which is fixedly connected to the tibia clamping ring (151), and a tibia clamping plate (154) which is used for connecting the tibia mounting plate (153) and the tibia connecting plates (152) together; when the sleeve (11) and the shaping cover (13) are installed together, the tibia mounting plate (153) and the tibia connecting plate (152) are butted together;

the femur buckle (25) comprises a plurality of femur connecting plates (251) which are sleeved and fixedly connected on the bottom support (22), a femur mounting plate (252) fixedly connected on the upper end cover (21), and a femur clamping plate (253) used for connecting the femur mounting plate (252) and the femur connecting plates (251) together; when the bottom support (22) and the upper end cover (21) are installed together, the femur mounting plate (252) and the femur connecting plate (251) are butted together.

5. The cement spacer for knee joint mold according to claim 1, wherein: and a sleeve accommodating groove (111) for accommodating the sleeve opening of the sleeve (11) is formed in the plastic cover (13).