Mould for forming a joint spacer device or a part thereof
阅读说明:本技术 用于形成关节占位器装置或其一部分的模具 (Mould for forming a joint spacer device or a part thereof ) 是由 A·凯培莱蒂 于 2015-11-05 设计创作,主要内容包括:本发明涉及一种用于形成关节占位器装置或其部分的模具,该模具包括:至少一个刚性容器主体(2),其设置有至少一个第一周缘轮廓部(5),第一周缘轮廓部(5)限定至少一个第一模制表面(6)的界限,第一模制表面(6)用来成形关节占位器或其部分的至少一个第一部分;至少一个刚性盖(3),其设置有至少一个第二周缘轮廓部(7),第二周缘轮廓部(7)限定至少一个第二模制表面(8)的界限,第二模制表面(8)用来成形关节占位器或其部分的至少一个第二部分;刚性容器主体(2)和刚性盖(3)能以能拆卸方式彼此接合于第一周缘轮廓部和第二周缘轮廓部,以限定与关节占位器的外部构造或关节占位器的部分的外部构造对应的腔体(4)的界限。模具包括在刚性容器主体(2)上和在刚性盖(3)上的削减装置(18),使得刚性容器主体(2)和刚性盖(3)能被分离成多个部分,以允许抽出模制在它们之间的一个占位器装置或其一个部分。(The invention relates to a mould for forming a joint spacer device or a part thereof, comprising: at least one rigid container body (2) provided with at least one first peripheral profile (5), the first peripheral profile (5) delimiting at least one first moulding surface (6), the first moulding surface (6) being intended to shape at least one first portion of a joint spacer or of a portion thereof; at least one rigid cover (3) provided with at least one second peripheral profile (7), the second peripheral profile (7) delimiting at least one second molding surface (8), the second molding surface (8) being intended to shape at least one second portion of the joint spacer or of a portion thereof; the rigid container body (2) and the rigid cover (3) are detachably engageable with each other to the first and second peripheral profiles to define the limits of the cavity (4) corresponding to the external conformation of the joint spacer or of the portion of the joint spacer. The mould comprises cut-down means (18) on the rigid container body (2) and on the rigid cover (3) so that the rigid container body (2) and the rigid cover (3) can be separated into portions to allow extraction of a spacer device or a portion thereof moulded between them.)
1. A mould for forming a joint spacer device or a part of a joint spacer device, the mould comprising:
-at least one rigid container body (2), said at least one rigid container body (2) being provided with at least one first peripheral profile (5), said at least one first peripheral profile (5) delimiting at least one first molding surface (6), said at least one first molding surface (6) being intended to shape at least one first portion of the joint spacer or of the component of the joint spacer;
-at least one rigid cover (3), said at least one rigid cover (3) being provided with at least one second peripheral profile (7), said at least one second peripheral profile (7) delimiting at least one second moulding surface (8), said at least one second moulding surface (8) being intended to shape at least one second portion of the joint spacer or of the component of the joint spacer,
said at least one rigid container body (2) and said at least one rigid cover (3) being removably engageable with each other at said first peripheral profile (5) and said second peripheral profile (7) to define the limits of a cavity (4) corresponding to the external conformation of the joint spacer or to the external conformation of the components of the joint spacer,
it is characterized in that the preparation method is characterized in that,
the mould comprises weakening means (18) on the at least one rigid container body (2) and on the rigid cover (3) such that both the at least one rigid container body (2) and the at least one rigid cover (3) can be separated into portions to allow extraction of the at least one spacer device or the at least one component of the at least one spacer device moulded between them;
wherein the at least one rigid container body (2) has a rim (21) delimiting at least one top access opening (22), and wherein the first peripheral profile (5) is located at an inner shoulder of the rigid container body (2);
wherein the at least one rigid cover (3) has an in-use lower surface (32) and an in-use upper or outer surface (33) and a peripheral rim (31) for engagement with the rim (21) of the rigid container body (2), and the at least one rigid cover (3) is configured such that the in-use lower surface (32) can be inserted into the at least one rigid container body (2) with the second peripheral profile (7) of the at least one rigid cover (3) abutting the internal shoulder.
2. Mould according to claim 1, wherein said weakening means (18) on said at least one rigid container body (2) and on said rigid cover (3) comprise at least one line of reduced thickness, so that said mould can be separated into a plurality of portions at said at least one line of reduced thickness.
3. A mould according to claim 2, wherein said at least one line of reduced thickness is provided on said rigid container body (2) and on said rigid cover (3) laterally and/or longitudinally.
4. Mould according to claim 1, wherein said second peripheral profile (7) is provided on said lower in use surface (32) of said at least one rigid cover (3).
5. Mould according to claim 1, wherein at least one peripheral recess (34) is formed on the lower in-use surface (32) of the rigid cover (3), so that the rim (21) of the rigid container body (2) can be inserted with interference fit in the peripheral recess (34).
6. Mould according to claim 1, wherein said rigid cover (3) comprises at least one through opening (35).
7. Mould according to claim 1, wherein said inner shoulder (5) is provided inside said at least one rigid container body (2) at a substantially constant distance from said rim (21).
8. A mould according to claim 1, wherein said at least one rigid container body (2) has a substantially C-shaped plan configuration and comprises a substantially convex bottom wall (19), said bottom wall (19) having a central portion (19a) and two end portions (19a, 19C), said central portion (19a) being shallowly convex with respect to said end portions (19a, 19C).
9. Mould according to claim 8, wherein said rigid cover (3) comprises at least one central portion (32a), said at least one central portion (32a) having a substantially rectangular cross section, projecting with respect to said lower in use surface (32) and facing, in use, said rigid container body (2).
10. Mould according to claim 9, wherein said internal shoulder (5) is provided within said at least one rigid container body at a substantially non-constant distance with respect to said rim (21).
11. Mould according to claim 10, wherein said first peripheral profile (5) comprises at least one portion (5a, 5b), said at least one portion (5a, 5b) of said first peripheral profile (5) being close to said edge (21) of said rigid container body (2) at a free end of the "C" and at an intermediate portion (5C) opposite said free end.
12. Mould according to claim 10 or 11, wherein said first peripheral profile (5) is arranged close to said bottom wall (19) at a remaining end portion (19b, 19C) and at a portion (5C) of a side wall (20) of said rigid container body (2) located between said free ends of said "C".
13. A mould according to claim 1, wherein said at least one rigid container body (2) has a substantially C-shaped plan configuration and comprises a substantially concave bottom wall (19), said bottom wall (19) having a central portion (19a) and two end portions (19a, 19C), said central portion (19a) being substantially convex with respect to said end portions (19a, 19C).
14. Mould according to claim 13, wherein the rigid cover (3) comprises at least one central portion (32a) at its lower surface (32) and two end portions, the central portion (32a) being recessed with respect to the end portions.
15. A mould according to claim 14, wherein the rigid cover (3) comprises at least one gripping portion (36) between the free ends of the C.
16. A mould according to claim 1, wherein the rigid container body (2) comprises at least one peripheral reinforcing rib (37) such that said at least one rigid container body (2) is not elastically deformable.
17. Mould according to claim 1, comprising further removable engagement means of the clamping type between said at least one rigid container body (2) and said at least one rigid cover (3).
18. A joint spacer device obtained by means of a mould according to claim 1.
Technical Field
The present invention relates to a mould for forming a joint spacer device or a part thereof and to a spacer device obtained by means of this mould.
Background
Disclosure of Invention
It is therefore a main object of the present invention to improve the state of the art in the industry category of moulds for forming joint spacer devices or parts thereof.
It is another object of the invention to provide a mould for forming a joint spacer device or a part thereof having an alternative configuration with respect to conventional moulds.
Another object of the invention is to provide a mould for forming a joint spacer device or a part thereof which cannot be used more than once.
A further object of the invention is to provide a mould for forming a joint spacer device or a part thereof that does not require a laborious polishing step of the spacer extracted therefrom.
Another object of the invention is to provide a mould for forming a joint spacer device or a part thereof that is easy to make at competitive costs.
The greatest object of the invention is to provide a joint spacer device or a part thereof obtained by means of this mould.
According to one aspect of the invention, there is provided a mould for forming a joint spacer device or a part thereof according to
The dependent claims refer to preferred and advantageous embodiments of the invention.
Application US2013/344186 discloses a hip spacer mould for forming a spacer with spacer rods connected to a spacer head. The hip joint spacer mold comprises: a stem portion for forming a placeholder stem; and a plurality of interchangeable head modules configured to selectively form placeholder heads having a plurality of different predetermined sizes. The head module is configured to be disposed adjacent to the stem. The placeholder bar comprises corresponding left and right bar members configured to mate and define a cavity or space; the left and right rod members are held together by fasteners. In addition, the stem portion has an opening that provides access to the internal cavity of the stem portion to receive high pressure cement injected from the cement gun.
Patent US6361731 discloses a method for forming a temporary orthopaedic implant using a suitably sized cement mold. The mold is translucent and includes an input opening through which the mold is filled with bone cement to form a temporary implant. The physician also fills the cement mold by introducing a nozzle into the input opening of the cement mold. The cement mold includes a first half and a second half joined by a connecting or coupling mechanism. Such connection or coupling mechanisms include tongue and groove coupling mechanisms: a substantially circular tongue extends around the outer periphery along the crown of the first half, while a rectangular groove is located substantially around the outer periphery of the second half.
Application US2010/102484 discloses a mould for forming a temporary prosthesis, which mould has at least two mould members at least partly separated from each other. The at least two mold members cooperatively define a substantially closed interior cavity for forming the temporary prosthesis. The mold has a securing structure mounted on the at least two mold members for securing the at least two mold members to one another during formation of the temporary prosthesis. The securing structure can be detached from the at least two mold members by hand without the use of tools.
Drawings
Further characteristics and advantages of the invention will become clearer from the detailed description of some examples of preferred embodiments of a mould for forming a joint spacer device or a part thereof, illustrated and described by way of example (but not limited to) in the following drawings, in which:
figure 1 is a plan view of a mould for forming a joint spacer device for a hip joint according to a first embodiment of the invention;
FIG. 2 shows a rear view of the mold of FIG. 1;
FIG. 3 shows a side perspective view of the mold of FIG. 1;
FIG. 4 is a side perspective view of the mold of FIG. 1 in an intermediate position between the open and closed positions;
FIG. 5 shows a detail of the mold of FIG. 1;
figure 6 is a plan view of a mould for forming part of a joint spacer device for a knee joint according to a second embodiment of the invention;
FIG. 7 shows a perspective view of the mold cap of FIG. 6;
FIG. 8 shows a perspective view of the mold container body of FIG. 6;
FIG. 9 is a perspective view of the mold of FIG. 6, wherein the container body and the lid engage one another, thereby defining the confines of the forming seat;
FIG. 10 shows another perspective view of the mold of FIG. 6, wherein the container body and the lid are engaged with one another;
figure 11 shows a side perspective view of a mould for forming part of a joint spacer device according to a third embodiment of the present invention;
FIG. 12 shows a plan view of the mold of FIG. 11;
FIG. 13 shows a perspective view of the container body of the mold of FIG. 11;
FIG. 14 is a perspective view of a cover of the mold of FIG. 11;
FIG. 15 shows a front perspective view of the mold of FIG. 11 with the container body and lid in an intermediate position with the lid partially inserted into the container; and
fig. 16 shows a perspective view of the mold of fig. 11, wherein the lid closes the container body and defines with the container body the limits of the forming seat.
In the drawings, the same parts or components are denoted by the same reference numerals.
Detailed Description
With reference to the accompanying drawings, a mould according to the invention is generally indicated with the
According to the invention, the
The
More particularly, the
The
The
In particular, with reference to figures 1 to 5 showing a mould for forming a joint spacer device according to a first embodiment of the invention, it will be noted that in this mould the
Each
In the mould according to the first embodiment of the invention, the
According to a variant of the mould according to the invention, the moulding surfaces 6 and 8 are each obtained in a respective supporting
Between the upper end of each
As already mentioned above, the mould according to the invention is configured in such a way that: once the bone cement is poured onto the molding surfaces 6, 8 and after a certain time has elapsed to harden part of it, the
For the detachable engagement between the
Furthermore, each
At this point, the
This weakening device, schematically shown in the figures, comprises at least a line of reduced thickness (indicated by way of example only with a broken line in fig. 1 and 2) where the
Referring to fig. 6 to 10, the
More particularly, the
The
The first
In addition, the
The
As will be noted, the
Referring now to the
The second
The
The
At this point, in addition, the
This weakening means, schematically shown in the figures, comprises at least a line of reduced thickness, where the
The accompanying figures 11 to 16 show a mould for forming a joint spacer according to a third embodiment of the invention, in particular suitable for forming a component or femoral part of a knee spacer device. This mould comprises at least a
More particularly, the
The
The
The first
More specifically, the
The
The
Referring now to the
The second
The
The
At this point, in addition, the
This weakening means, schematically illustrated in the figures (for example in fig. 12) with dashed lines, comprises at least a line of reduced thickness where the
As for the other embodiments described above, the weakening
Referring now to the second and third embodiments of the invention, it will be noted that the
Furthermore, both the
Furthermore, once
Once closed, the mold can be placed on any of its surfaces, with or without the aid of additional bonding means, without the need to keep the mold accurately positioned during hardening of the bone cement held in the mold.
The above-described
Thus, for example, if a joint spacer device for the hip is to be made by means of a mould according to the first embodiment of the invention, equipped with a metal core or any other suitable material capable of providing greater resistance to the force of the spacer device, this mould will also comprise one or more spacer elements (not shown in the figures), for example a sleeve fitted on this core or element in any case capable of supporting this core or element; during the forming phase of the joint spacer device, said spacer elements may be set in predetermined positions on one or the