3D printing personalized hip joint bone cement spacer mold

Abstract

The utility model discloses a 3D printing individualized hip joint bone cement spacer mould which comprises an upper mould assembly, a lower mould assembly and a locking assembly, an upper cavity and a lower cavity are formed in the upper mould assembly and the lower mould assembly respectively, the upper mould assembly and the lower mould assembly are buckled so that the upper cavity and the lower cavity can form a closed cavity, and the locking assembly is arranged in the closed cavity. The closed cavity is used for forming a hip joint bone cement spacer; the locking assembly comprises a first locking piece and a second locking piece, and the first locking piece and the second locking piece are arranged at the two ends of the upper die assembly and the lower die assembly which are buckled respectively and hoop the upper die assembly and the lower die assembly. The hip joint spacer mold is designed according to preoperative CT data of a patient, individualized customization is achieved, precision is high, manufacturing is fast, demolding is convenient, and popularization is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to a 3D printed personalized hip joint bone cement placeholder mold. Background Art

[0002] The serious complications caused by infection after artificial hip replacement surgery are difficult to deal with clinically. The current mainstream treatment method is a two-stage revision surgery, which is to remove the artificial hip prosthesis, thoroughly clean the wound, and perform a second surgery after the infection is controlled to implant a new artificial hip prosthesis. During the infection control period, a hip spacer is used to occupy the empty space where the prosthesis was removed. This can not only maintain the tension of the hip joint and prevent the soft tissue around the hip joint from contracting and affecting the effect of the second-stage revision surgery, but also locally supply high concentrations of antibiotics to control the infection. Therefore, hip spacers have become the mainstream treatment for infections after hip replacement surgery.

[0003] At present, the production of hip joint placeholders needs to be completed through placeholder molds, such as the "hip joint placeholder mold" disclosed in the Chinese invention patent application with the authorization announcement CN103538193B. In this patented technology, the upper mold assembly and the lower mold assembly are fixed by fastening nuts at both ends. Although the upper and lower mold assemblies can be fixed together to avoid manual tightening, the tightening degree of the fastening nuts at both ends will be different in actual use, resulting in a situation where one end is tight and the other end is loose, which in turn leads to differences at both ends of the cavity formed by the upper and lower mold assemblies, affecting the shape of the hip joint placeholder after curing, thereby affecting the accuracy of the hip joint placeholder. Utility Model Content

[0004] In view of this, the utility model proposes a 3D printed personalized hip joint bone cement placeholder mold, which is used to solve the technical problem of low precision of the manufactured hip joint placeholder caused by the bolt fastening method used in the existing hip joint cement placeholder mold.

[0005] In order to achieve the above technical objectives, the technical solution of the utility model provides a 3D printed personalized hip joint bone cement placeholder mold, including:

[0006] An upper mold assembly and a lower mold assembly, wherein an upper cavity and a lower cavity are formed in the upper mold assembly and the lower mold assembly respectively, and the upper mold assembly and the lower mold assembly are buckled so that the upper cavity and the lower cavity form a closed cavity, and the closed cavity is used to form a hip joint bone cement placeholder;

[0007] The locking assembly comprises a first locking member and a second locking member, wherein the first locking member and the second locking member are respectively arranged at the two ends of the upper mold assembly and the lower mold assembly after being buckled, and clamp the upper mold assembly and the lower mold assembly.

[0008] Furthermore, the first locking member includes a fixing seat, and a first clamping groove for cooperating and connecting with the upper mold assembly and the lower mold assembly is formed on one side of the fixing seat.

[0009] Furthermore, the first locking member includes a fixing frame, and a second clamping groove for cooperating and connecting with the upper mold assembly and the lower mold assembly is formed in the fixing frame, and both ends of the second clamping groove pass through the fixing frame.

[0010] Furthermore, the structure of the second locking member is the same as that of the first locking member.

[0011] Furthermore, a first demolding groove is formed on both sides of one end of the upper mold assembly that contacts the lower mold assembly, and a second demolding groove is formed on both sides of one end of the lower mold assembly that contacts the upper mold assembly. The first demolding groove and the second demolding groove located on the same side are symmetrically arranged along the interface between the upper mold assembly and the lower mold assembly.

[0012] Furthermore, the upper mold assembly includes an upper mold body and an upper mold inner core, the upper mold body is formed with the upper mold cavity, the upper mold inner core is arranged in the upper mold cavity, and the outer contour shape of the upper mold inner core is the same as the inner contour shape of the upper mold cavity.

[0013] Furthermore, a plurality of first demoulding through holes are formed on the outer side surface of the upper mold body, and the plurality of first demoulding through holes are distributed on the upper mold cavity.

[0014] Wherein, the first demoulding grooves are located on both sides of the upper mold body.

[0015] Furthermore, the lower mold assembly includes a lower mold body and a lower mold inner core, the lower mold body is formed with the lower mold cavity, the lower mold inner core is arranged in the lower mold cavity, and the outer contour of the lower mold inner core is the same as the inner contour shape of the lower mold cavity.

[0016] Furthermore, a plurality of second demoulding through holes are formed on the outer side surface of the lower mold body, and the plurality of second demoulding through holes are distributed on the lower mold cavity.

[0017] Wherein, the second demoulding grooves are located on both sides of the lower mold body.

[0018] Furthermore, two Kirschner wires are included, and the two Kirschner wires are respectively arranged in the upper cavity and the lower cavity.

[0019] Compared with the prior art, the beneficial effects of the utility model mainly include:

[0020] The utility model provides a 3D printed personalized hip joint bone cement placeholder mold, which is produced by a 3D printer according to the patient's preoperative CT data when in use. It is a placeholder mold with a simple structure, quick production, and can be customized. Moreover, after the upper mold assembly and the lower mold assembly are buckled together, the two ends of the buckled upper mold assembly and the lower mold assembly are locked and fixed by a snap-on locking assembly, which can avoid the situation where the two ends of the buckled upper mold assembly and the lower mold assembly have different tightness, thereby ensuring the consistency of the two ends of the formed closed cavity and improving the accuracy of the formed hip joint placeholder. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the mold of the utility model;

[0022] Figure 2 It is a structural diagram of the upper mold assembly of the utility model (the lower mold assembly is the same as the upper mold assembly);

[0023] Figure 3 It is a structural diagram of the upper mold assembly of the utility model after adding the mold core (the lower mold assembly is the same as the upper mold assembly);

[0024] Figure 4 It is a side view of the upper mold assembly and the lower mold assembly of the utility model after being buckled together and locked by the locking assembly.

[0025] As shown in the figure:

[0026] 100 - upper mold assembly, 110 - upper mold body, 120 - upper mold inner core, 101 - upper mold cavity, 102 - first demoulding groove, 103 - first demoulding through hole;

[0027] 200 - lower die assembly;

[0028] 300 - locking assembly, 310 - first locking member, 320 - second locking member. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0030] Please also read Figures 1 to 4As shown, the utility model provides a 3D printed personalized hip joint bone cement placeholder mold, including an upper mold assembly 100, a lower mold assembly 200 and a locking assembly 300, wherein the upper mold assembly 100 and the lower mold assembly 200 are respectively formed with an upper cavity 101 and a lower cavity which are symmetrically arranged with each other (since the structure of the lower cavity is symmetrical with that of the upper cavity, the structure of the lower cavity here can refer to the structure of the upper cavity), the upper mold assembly 100 and the lower mold assembly 200 are buckled so that the upper cavity 101 and the lower cavity are connected to form a closed cavity, and the closed cavity is used to form a hip joint bone cement placeholder; the locking assembly 300 includes a first locking piece 310 and a second locking piece 320, and the first locking piece 310 and the second locking piece 320 are respectively arranged at the two ends of the upper mold assembly 100 and the lower mold assembly 200 after buckling, and clamp the upper mold assembly 100 and the lower mold assembly 200.

[0031] The hip joint bone cement placeholder mold provided by the utility model is produced by a 3D printer according to the patient's preoperative CT data when in use, and can meet the requirements of convenient, fast, reliable and high-precision production in the operating room; and, the utility model uses the first locking member 310 and the second locking member 320 to clamp the two ends of the upper mold assembly 100 and the lower mold assembly 200 after being buckled, respectively, so that the force is balanced on the basis of fixing the upper mold assembly 100 and the lower mold assembly 200, so that the two ends of the formed closed cavity have a high degree of consistency, which is beneficial to improving the accuracy of the bone cement placeholder after curing, and because the locking assembly 300 is provided, the doctor does not need to press the upper and lower molds by hand to continuously provide a tightening force to ensure the quality of the formed placeholder.

[0032] In addition, the upper mold assembly 100 and the lower mold assembly 200 of the utility model are independent of each other and do not affect each other during the bone cement filling process, which is convenient for multiple people to operate during the operation and can save operation time. At the same time, the upper mold assembly 100 and the lower mold assembly 200 are easy to align with each other, with high forming accuracy, and the surface quality of the placeholder will not be affected by misalignment.

[0033] In a preferred embodiment, the first locking member 310 is in the form of a fixing seat, and a first clamping groove for cooperating and connecting with the upper mold assembly 100 and the lower mold assembly 200 is formed on one side of the fixing seat.

[0034] In a preferred embodiment, the first locking member 310 is in the form of a fixed frame, and a second clamping groove for connecting with the upper mold assembly 100 and the lower mold assembly 200 is formed in the fixed frame, and both ends of the second clamping groove pass through the fixed frame. In other words, the first locking member 310 is a square fixed seat or a fixed frame, and no matter whether it is a fixed frame or a fixed seat, a clamping groove is opened inside it for clamping with the upper mold assembly 100 and the lower mold assembly 200.

[0035] In a preferred embodiment, the structure of the second locking member 320 is the same as that of the first locking member 310. Here, when the first locking member 310 is a fixed seat, the second locking member 320 is also a fixed seat, and when the first locking member 310 is a fixed frame, the second locking member 320 is also a fixed frame.

[0036] In a preferred embodiment, first demolding grooves 102 are formed on both sides of one end of the upper mold assembly 100 in contact with the lower mold assembly 200, and second demolding grooves are formed on both sides of one end of the lower mold assembly 200 in contact with the upper mold assembly 100, and the first demolding groove 102 and the second demolding groove located on the same side are symmetrically arranged along the intersection surface of the upper mold assembly 100 and the lower mold assembly 200. Here, the arrangement of the first demolding groove 102 and the second demolding groove facilitates the doctor to pry open the mold and remove the placeholder.

[0037] In a preferred embodiment, the upper mold assembly 100 includes an upper mold body 110 and an upper mold inner core 120 that is easy to demold, the upper mold body 110 is formed with the upper mold cavity, the upper mold inner core 120 is arranged in the upper mold cavity, and the outer contour shape of the upper mold inner core 120 is the same as the inner contour shape of the upper mold cavity, and the outer side surface of the upper mold body 110 is formed with a plurality of first demolding through holes 103, and the plurality of first demolding through holes 103 are distributed on the upper mold cavity, and the first demolding grooves 102 are located on both sides of the upper mold body 110.

[0038] In a preferred embodiment, the structure of the lower mold assembly 200 is the same as that of the upper mold assembly 100. Therefore, the structure of the lower mold assembly 200 is similar to that of the upper mold assembly 100. Figure 1 and Figure 2 Specifically, the lower mold assembly 200 includes a lower mold body and a lower mold inner core, the lower mold body is formed with the lower mold cavity, the lower mold inner core is arranged in the lower mold cavity, and the outer contour of the lower mold inner core is the same as the inner contour of the lower mold cavity, the outer side surface of the lower mold body is formed with a plurality of second demolding through holes, the plurality of second demolding through holes are distributed on the lower mold cavity, and the second demolding grooves are located on both sides of the lower mold body.

[0039] In a preferred embodiment, two Kirschner wires are further included, and the two Kirschner wires are respectively arranged in the upper cavity and the lower cavity.

[0040] The utility model provides a 3D printed personalized hip joint bone cement placeholder mold. During the process of making the placeholder, first, two 2.5mm Kirschner wires are placed in the upper mold assembly 100 and the lower mold assembly 200 respectively. The Kirschner wires are pre-bent to a suitable size according to the contours of the upper cavity 101 and the lower cavity, and the Kirschner wires are fixed by winding with stainless steel wires; then, bone cement containing antibiotics is injected into the upper mold core 120 and the lower mold core respectively, and the upper and lower mold assemblies and the upper and lower mold cores are buckled together and locked by the locking assembly 300. After the bone cement is solidified, a hip joint placeholder is formed. The hip joint placeholder is made in a sterile environment during the operation, and its shape is determined after solidification. It is implanted as a short-term implant component at the position where the prosthesis is removed, and then removed during the second stage of the operation.

[0041] In addition, when using the utility model, first mix and stir the powder component and the liquid component of the high-viscosity bone cement in the manner specified in the bone cement instructions. When the bone cement changes from a viscous powder-liquid mixture to a dough-like state, use hands to fully fill the bone cement dough into the upper mold core 120 and the lower mold core. It is necessary to ensure that the filling components are filled and the surface of the bone cement is slightly higher than the outer edges of the upper mold core 120 and the lower mold core.

[0042] Tighten for 10 minutes until the bone cement is fully formed, remove the locking assembly 300, disassemble the mold at the first demolding groove 102 and the second demolding groove of the upper and lower molds, pry open the upper mold core 120 and the lower mold core, and take out the hip joint placeholder.

[0043] From the above description, it can be seen that the embodiments of the present invention achieve the following technical effects:

[0044] Compared with the prior art, the utility model has an upper mold assembly 100 and a lower mold assembly 200 which are independent of each other and do not affect each other during the filling of bone cement, which is convenient for multiple people to operate during the operation and can save operation time; at the same time, the upper mold assembly 100 and the lower mold assembly 200 are easy to mate with each other and have high shape-fitting accuracy, and the surface quality of the placeholder will not be affected by the wrong mold; moreover, the utility model is provided with a locking assembly 300, which does not require the doctor to manually press the upper and lower molds, and can continuously provide extrusion capacity to ensure the production quality of the placeholder; moreover, the design of the demoulding grooves in the upper mold assembly 100 and the lower mold assembly 200 of the utility model is convenient for the doctor to pry open the mold and take out the placeholder; at the same time, the material used in the utility model does not adhere to the bone cement, so it is very easy to take out the cured placeholder; finally, the mold made by the utility model according to the patient's preoperative CT data realizes individualization and precision, and can adjust the anteversion angle to effectively avoid the possibility of postoperative dislocation.

[0045] The specific implementation methods of the utility model described above do not constitute a limitation on the protection scope of the utility model. Any other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A 3D printed personalized hip joint bone cement placeholder mold, characterized in that: include: An upper mold assembly and a lower mold assembly, wherein an upper cavity and a lower cavity are formed in the upper mold assembly and the lower mold assembly respectively, and the upper mold assembly and the lower mold assembly are buckled so that the upper cavity and the lower cavity form a closed cavity, and the closed cavity is used to form a hip joint bone cement placeholder; and The locking assembly comprises a first locking member and a second locking member, wherein the first locking member and the second locking member are respectively arranged at the two ends of the upper mold assembly and the lower mold assembly after being buckled, and clamp the upper mold assembly and the lower mold assembly.

2. The 3D printed personalized hip joint bone cement placeholder mold according to claim 1, characterized in that: The first locking member comprises a fixing seat, and a first clamping groove for cooperating and connecting with the upper mold assembly and the lower mold assembly is formed on one side of the fixing seat.

3. The 3D printed personalized hip joint bone cement placeholder mold according to claim 1, characterized in that: The first locking member includes a fixing frame, in which a second clamping groove for being matched and connected with the upper mold assembly and the lower mold assembly is formed, and two ends of the second clamping groove pass through the fixing frame.

4. The 3D printed personalized hip joint bone cement placeholder mold according to claim 2 or 3, characterized in that: The structure of the second locking member is the same as that of the first locking member.

5. The 3D printed personalized hip joint bone cement placeholder mold according to claim 1, characterized in that: A first demolding groove is formed on both sides of one end of the upper mold assembly that contacts the lower mold assembly, and a second demolding groove is formed on both sides of one end of the lower mold assembly that contacts the upper mold assembly. The first demolding groove and the second demolding groove located on the same side are symmetrically arranged along the interface between the upper mold assembly and the lower mold assembly.

6. The 3D printed personalized hip joint bone cement placeholder mold according to claim 5, characterized in that: The upper mold assembly includes an upper mold body and an upper mold inner core. The upper mold body forms the upper mold cavity. The upper mold inner core is disposed in the upper mold cavity, and the outer contour shape of the upper mold inner core is the same as the inner contour shape of the upper mold cavity.

7. The 3D printed personalized hip joint bone cement placeholder mold according to claim 6, characterized in that: The outer side surface of the upper mold body is formed with a plurality of first demoulding through holes, and the plurality of first demoulding through holes are distributed on the upper mold cavity. Wherein, the first demoulding grooves are located on both sides of the upper mold body.

8. The 3D printed personalized hip joint bone cement placeholder mold according to claim 5, characterized in that: The lower mold assembly includes a lower mold body and a lower mold inner core. The lower mold body forms the lower mold cavity. The lower mold inner core is disposed in the lower mold cavity. The outer contour of the lower mold inner core is the same as the inner contour of the lower mold cavity.

9. The 3D printed personalized hip joint bone cement placeholder mold according to claim 8, characterized in that: The outer side surface of the lower mold body is formed with a plurality of second demoulding through holes, and the plurality of second demoulding through holes are distributed on the lower mold cavity. Wherein, the second demoulding grooves are located on both sides of the lower mold body.

10. The 3D printed personalized hip joint bone cement placeholder mold according to claim 1, characterized in that: It also includes two Kirschner wires, which are respectively arranged in the upper cavity and the lower cavity.

Images