CN211251129U

CN211251129U - Hip joint type antibiotic bone cement spacer die

Info

Publication number: CN211251129U
Application number: CN201920112935.7U
Authority: CN
Inventors: 杨瑞; 吴顺顺; 孙大铮; 方莉
Original assignee: Harmony Biotech Ltd
Current assignee: Harmony Biotech Ltd
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2020-08-14
Anticipated expiration: 2029-01-23

Abstract

The utility model discloses a hip joint type antibiotic bone cement spacer die, which consists of an upper die, a lower die, a side die, a fixed base and a locking bolt; the upper die and the lower die are used for forming a femoral medullary cavity part of the spacer, the side die is used for forming a femoral head part of the spacer, and when the upper die, the lower die and the side die are buckled, a cavity in the shape of a hip joint prosthesis is formed and is used for forming the hip joint type antibiotic bone cement spacer. The utility model discloses beneficial effect is pouring into bone cement in its adoption and gets into mould cavity shaping placeholder mode, compares the tradition and adopts the shaping placeholder mode of upper and lower mould extruded surface bulk bone cement, and ready-made mould can effectually save bone cement to improve the fashioned qualification rate of placeholder.

Description

Hip joint type antibiotic bone cement spacer die

Technical Field

The invention relates to the field of medical instruments, in particular to a hip joint type antibiotic bone cement spacer die.

Background

Post-artificial joint replacement infection is a destructive complication, causing great pain to the patient mentally, great economic loss, and great pressure to the doctor. The traditional syndrome is called as catastrophic complication, but the treatment effect is obviously improved along with the increase of the knowledge and the improvement of the treatment method. Although there are many treatment methods, the method of taking out the original prosthesis to thoroughly debride, using the temporary space occupying device to maintain the tension of soft tissues, avoiding the contracture of the soft tissues around the joint, providing high-concentration antibiotics for local parts, and performing second-stage operation revision after infection control is the currently accepted 'gold standard' for the treatment of infection after artificial joint replacement.

At present, most hip joint spacers are made of bone cement, specifically, the bone cement containing antibiotics is filled in a special mould, and when the bone cement is solidified, a fixed shape can be formed. The mould that now commonly used takes shape the bone cement of the dough form and fills earlier in mould and lower mould respectively, in order to make bone cement fill the die cavity, the bone cement of filling in must be greater than the actual filling volume of die cavity, then will go up mould and lower mould and extrude, open the mould after bone cement solidification, take out the placeholder, this kind of mode is not good to the fashioned use amount of bone cement placeholder and is controlled, it can cause bone cement extravagant to fill much, it is few to fill, bone cement placeholder can not take shape, so often can cause the extravagant or fashioned placeholder nonconforming phenomenon of bone cement.

The existing commonly used hip joint spacer mold forming part only comprises an upper mold part and a lower mold part, so that a parting line appears on the femoral head part of the spacer, the parting line is difficult to process and smooth in the later stage, the contact part of the femoral head and the acetabulum is interfered, and the postoperative discomfort of a patient is caused.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide the die which is simple to operate, has higher precision, can save bone cement, has high qualification rate of forming an placeholder, and simultaneously solves the problems that the femoral head part of the placeholder has parting marks and the thickness of the femoral head part of the placeholder is high.

In order to achieve the purpose, the invention adopts the following design scheme:

the utility model provides a hip joint type antibiotic bone cement spacer mould which characterized in that this mould comprises last mould, lower mould, side form, unable adjustment base, locking bolt, and last mould and lower mould are used for the femoral medullary cavity part of shaping spacer, and the side form is used for shaping the femoral head part of spacer, forms the cavity of hip joint false body shape after last mould, lower mould, side form lock, and this cavity is used for shaping hip joint type antibiotic bone cement spacer.

Furthermore, the upper die and the lower die are uniformly provided with semicircular channels which are mutually symmetrical along the interface of the upper die and the lower die, when the upper die and the lower die are combined, the circular channels are formed, and bone cement is injected into a die cavity from the positions.

Furthermore, the upper die part is provided with three positioning holes which are distributed in a triangular manner, the lower die is provided with three positioning pins which are distributed in a triangular manner, and the positioning pins of the lower die are inserted into the positioning holes of the upper die, so that the accurate positioning of the upper die and the lower die in the closing process can be realized.

Furthermore, three positioning pins which are distributed in a triangular shape are arranged on the fixing base, positioning holes are respectively formed in the upper die, the lower die and the side die, and after the upper die, the lower die and the side die are combined, the positioning holes are inserted into the positioning pins of the fixing base, so that the fixing base can accurately position the die.

Furthermore, the upper die is provided with two positioning holes on the matching surface with the side die, the lower die is provided with one positioning hole on the matching surface with the side die, the side die is provided with three positioning pins distributed in a triangular shape on the matching surfaces with the upper die and the lower die, and after the upper die is matched with the lower die, the positioning pins of the side die are inserted into the positioning holes of the upper die and the lower die, so that the accurate positioning in the closing process of the die can be realized.

Furthermore, the side die is provided with two small air exhaust holes which are used for exhausting air in the die cavity in the process of injecting bone cement into the die, so that the bone cement is ensured to fill the whole die cavity.

The invention has the beneficial effects that: compared with the prior art, the invention adopts a mode of injecting the bone cement into the cavity after the die combination, when the cavity is filled with the bone cement, the redundant bone cement can flow out from the air holes of the side die, and the mode can save the using amount of the bone cement and improve the yield of the bone cement spacer; in addition, the mold adopts a mode that the side mold independently molds the femoral head part of the hip joint spacer, the molded femoral head part has no mold parting line on the surface, and the femoral head part of the spacer is smooth, so that the postoperative comfort of a patient can be improved compared with spacers in other molding modes; all designs between mould, lower mould, side form, the unable adjustment base on this mould have locating pin and locating hole, and the mould is each partial cooperation convenience, and the precision is high after the cooperation, can not influence placeholder surface quality because the wrong mould.

Drawings

The invention is further described below in conjunction with the appended drawings and the detailed description.

FIG. 1 is a schematic exploded perspective view of a hip joint type antibiotic bone cement spacer mold according to the present invention;

FIG. 2 is a schematic structural view of a hip joint spacer formed by the hip joint type antibiotic bone cement spacer mold of the invention;

FIG. 3 is a schematic structural view of an upper die and a lower die of the hip joint type antibiotic bone cement spacer die of the invention which are combined and locked to be matched with a side die;

FIG. 4 is a schematic structural view of an upper mold, a lower mold and a side mold of the hip joint type antibiotic bone cement spacer mold, which are ready to be matched with a fixed base after being matched;

FIG. 5 is a schematic structural view of the hip joint type antibiotic bone cement spacer mold after the assembly is completed.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.

Referring to fig. 1 to 5, there are shown schematic structural views of the hip joint type antibiotic bone cement spacer mold provided in the present example. As can be seen from the figure, the hip joint spacer forming device comprises an upper die 1, a lower die 2, a side die 3, a fixed base 4 and a locking bolt 5, wherein the upper die 1, the lower die 2 and the side die 3 are buckled with each other to form a cavity in the shape of a hip joint prosthesis, the cavity is in accordance with the shape of the hip joint spacer 6 and is used for forming the hip joint spacer 6, and then the upper die 1, the lower die 2 and the side die 3 which are combined and locked by the locking bolt 5 are combined and placed into the fixed base 4.

Specifically, the upper die 1 and the lower die 2 are used for forming a femoral medullary cavity part 62 of the spacer, the side die is used for forming a femoral head part 61 of the spacer, and after the upper die 1, the lower die 2 and the side die 3 are buckled, a cavity in the shape of a hip joint prosthesis is formed and is used for forming the hip joint type antibiotic bone cement spacer 6.

In one embodiment, the upper and lower dies 1 and 2 each have a

semicircular channel

12 and 22 which are symmetrical to each other along the interface between the upper and lower dies and form a circular channel 7 when the upper and lower dies are assembled, through which bone cement is injected into the cavity of the die.

In one embodiment, the upper mold 1 has three

positioning holes

13, 14, 15 distributed in a triangle, and the lower mold 2 has three

positioning pins

23, 24, 25 distributed in a triangle, and the positioning pins of the lower mold are inserted into the positioning holes of the upper mold to realize accurate positioning during the closing process of the upper and lower molds.

In one embodiment, the upper die 1 has two

positioning holes

16, 17 on the matching surface with the side die 3, the lower die has one positioning hole 26 on the matching surface with the side die, and the side die has three

positioning pins

34, 35, 36 distributed in a triangle on the matching surfaces with the upper die and the lower die.

In an embodiment, the fixing base 4 has three

positioning pins

41, 42, 43 distributed in a triangular shape, and the upper die 1, the lower die 2, and the side die 3 have one

positioning hole

18, 27, 37, respectively, and after the upper die 1, the lower die 2, and the side die 3 are combined, the positioning holes are inserted into the positioning pins of the fixing base, so that the fixing base can accurately position the die.

In one embodiment, the side mold 3 has two small air vent holes 32 for venting air from the mold cavity during the injection of bone cement into the mold to ensure that the bone cement fills the entire cavity.

When the bone cement injection device is used, high-viscosity bone cement is mixed and stirred with powder components and liquid components according to a mode specified by a bone cement specification, the bone cement is filled into a bone cement injection tube after being uniformly mixed, then a bone cement injection gun is used for injecting the bone cement in the injection tube into a cavity from an injection port 7 in an placeholder die, and the bone cement is stopped being injected when the bone cement overflows from air holes 32 in the die.

And after 5 to 10 minutes, completely curing the bone cement, firstly removing the fixed base 4, then opening the side die 3, removing the side die 3, then unscrewing the locking bolt 5, opening the upper die and the lower die, and taking out the hip joint type antibiotic bone cement spacer 6.

Claims

1. The utility model provides a hip joint type antibiotic bone cement spacer mould, its characterized in that comprises last mould (1), lower mould (2), side form (3), unable adjustment base (4), locking bolt (5), goes up mould (1) and lower mould (2) and is used for forming femoral medullary cavity part (62) of spacer, and side form (3) are used for forming femoral head part (61) of spacer, forms the cavity of hip joint prosthesis shape after last mould (1), lower mould (2), side form (3) lock, and this cavity is used for forming hip joint type antibiotic bone cement spacer (6).

2. A hip-joint type antibiotic bone cement spacer mould according to claim 1, characterized in that the upper (1) and lower (2) moulds each have a semicircular channel (12, 22) symmetrical to each other along the interface between the upper and lower mould, which when assembled form a circular channel (7), through which channel (7) bone cement is injected into the mould cavity.

3. The hip joint type antibiotic bone cement spacer die as claimed in claim 1, wherein the upper die (1) has three positioning holes (13, 14, 15) distributed in a triangle shape, the lower die (2) has three positioning pins (23, 24, 25) distributed in a triangle shape, and the positioning pins (23, 24, 25) of the lower die (2) are inserted into the positioning holes (13, 14, 15) of the upper die (1) to realize accurate positioning during the matching of the upper die and the lower die.

4. The hip joint type antibiotic bone cement spacer die as claimed in claim 1, wherein the upper die (1) has two positioning holes (16, 17) on the matching surface with the side die (3), the lower die (2) has one positioning hole (26) on the matching surface with the side die (3), and the side die (3) has three positioning pins (34, 35, 36) distributed in a triangular shape on the matching surfaces with the upper die (1) and the lower die (2), when the upper die (1) is matched with the lower die (2), the positioning pins (34, 35, 36) of the side die (3) are inserted into the positioning holes (16, 17, 26) of the upper die (1) and the lower die (2) to realize accurate positioning in the die folding process.

5. The hip joint type antibiotic bone cement spacer die as claimed in claim 1, wherein the fixing base (4) is provided with three positioning pins (41, 42, 43) which are distributed in a triangular shape, the upper die (1), the lower die (2) and the side die (3) are respectively provided with one positioning hole (18, 27, 37), and after the upper die (1), the lower die (2) and the side die (3) are combined, the positioning holes (18, 27, 37) are inserted into the positioning pins (41, 42, 43) of the fixing base (4) to realize the accurate positioning of the fixing base (4) to the die.

6. The hip joint type antibiotic bone cement spacer mould according to claim 1, characterized in that the side mould (3) is provided with two small air vent holes (32), the small air vent holes (32) are used for exhausting air in the mould cavity during the process of injecting bone cement into the mould, and the bone cement is ensured to fill the whole mould cavity.