A passive spherical marker and preparation method thereof

Abstract

The present invention discloses a passive spherical marker and a preparation method thereof. The passive spherical marker comprises a first substrate hemisphere and a second substrate hemisphere pasted together by strong glue to form a complete sphere, a reflective hemisphere pasted on the sphere, and the passive spherical marker is installed on an optical marker support column of a surgical instrument, and is used to locate the position of the surgical instrument in optical navigation surgery. The problems of roundness, precision and consistency of the passive spherical marker are solved, and secondary injection molding is not required, so the process cost is low. The passive spherical marker is worthy of being widely promoted and used.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a passive spherical marker for surgical navigation and a preparation method thereof. Background Art

[0002] The optical surgical navigation system is a new type of surgical assistance system, especially suitable for neurosurgery, thoracic surgery, orthopedics and other surgical fields. The optical surgical navigation system can obtain the spatial position, size and other information of the patient's lesion in real time, provide a reference for the selection and design of surgery, and improve the safety and success rate of surgery.

[0003] In optical navigation surgery, spherical markers are installed on the optical marker support column of the surgical instrument. By asymmetrically installing reflective balls on the support column, three-dimensional reflection is achieved to meet the navigation and positioning needs. The optical positioning navigation system emits infrared light, which is reflected by the spherical markers, identifies the collection of small balls composed of spherical markers, and uses algorithms to track and feedback the movement trajectory of surgical instruments in real time; therefore, the roundness and accuracy of the spherical markers have a great impact on the accuracy of the navigation system, and the spherical markers are consumables and need to be replaced frequently, which also places higher requirements on the consistency of the spherical markers.

[0004] At the same time, the passive reflective ball in the current existing technology can achieve the effect of marking recognition, but when performing optical positioning recognition, the reflective brightness is low and the recognition accuracy decreases significantly after three disassembly and assembly.

[0005] Therefore, how to provide a spherical marker with high roundness, accuracy and consistency is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the invention

[0006] In view of the above problems, the present invention provides a passive spherical marker and a preparation method for overcoming the above problems or at least partially solving the above problems.

[0007] The present invention provides the following scheme:

[0008] A passive spherical marker, comprising:

[0009] A spherical substrate, the spherical substrate comprising a first substrate hemisphere and a second substrate hemisphere; the first substrate hemisphere and the second substrate hemisphere both have a non-solid structure and are both made by injection molding;

[0010] A spherical reflective shell, comprising a first reflective hemisphere and a second reflective hemisphere, wherein the first reflective hemisphere and the second reflective hemisphere are both made of a composite material consisting of a plastic sheet and a reflective film; the first reflective hemisphere and the second reflective hemisphere are respectively connected to the surfaces of the first base hemisphere and the second base hemisphere in a one-to-one correspondence;

[0011] Among them, the first base hemisphere and the second base hemisphere are connected by shaft-hole matching and surface contact positioning to form a spherical structure; the first base hemisphere is formed with a first mounting hole, and the first reflective hemisphere is formed with a second mounting hole. After the first base hemisphere is connected to the first reflective hemisphere, the first mounting hole is opposite to the second mounting hole, so that the marker support column can be connected to the passive spherical marker through the second mounting hole and the first mounting hole.

[0012] Preferably: a connecting shaft is provided inside the second base hemisphere, and the first base hemisphere and the second base hemisphere are connected to each other by shaft-hole matching through the connecting shaft and the first mounting hole.

[0013] Preferably, the marker support column is connected to the passive spherical marker in a multi-faceted contact manner.

[0014] Preferably: the front end face of the marker support column abuts against the end face of the connecting shaft to form a first contact surface, and the marker support column has a variable diameter columnar structure so that the marker support column and the inner wall of the first mounting hole form a second contact surface, a third contact surface and a fourth contact surface.

[0015] Preferably: the variable diameter columnar structure includes a first contraction section and a second contraction section, an inner convex structure is formed inside the first mounting hole, and the second contact surface is formed between the first contraction section and the second contraction section and at a position relative to the inner convex structure; the variable diameter columnar structure includes a straight tube section, and the third contact surface is formed at the position of the straight tube section; a wide mouth structure is formed at the outermost side of the first mounting hole, the variable diameter columnar structure includes an outer expansion section, and the fourth contact surface is formed at the contact position between the wide mouth structure and the outer expansion section.

[0016] Preferably: a shoulder step structure is formed at the contact position between the first base hemisphere and the second base hemisphere, so that a surface contact positioning structure is formed after the first base hemisphere and the second base hemisphere are connected.

[0017] Preferably, the first reflective hemisphere and the second reflective hemisphere are respectively connected to the surfaces of the first base hemisphere and the second base hemisphere in a one-to-one correspondence manner by bonding.

[0018] Preferably, a plurality of reinforcing support plates are formed inside each of the first base hemisphere and the second base hemisphere.

[0019] A method for preparing the above-mentioned passive spherical marker, the method comprising:

[0020] The first base hemisphere and the second base hemisphere are respectively manufactured by using medical-grade materials through an injection molding process, and the first base hemisphere and the second base hemisphere are assembled to form the spherical base;

[0021] Using molding equipment to obtain the reflective hemisphere to be cut;

[0022] Using a cutting device to cut the semi-finished product to obtain the first reflective hemisphere and the second reflective hemisphere;

[0023] Punching the first reflective hemisphere by using a punching device to form the second mounting hole at the center of the bottom of the first reflective hemisphere;

[0024] Wherein, the molding device comprises a first molding convex mold and a first molding concave mold, and the cutting device comprises a second molding convex mold and a second molding concave mold, and the outer contour shape and size of the first molding convex mold are the same as the outer contour and size of the second base hemisphere;

[0025] The punching device comprises a punching positioning mechanism, the outer contour shape and size of the punching positioning mechanism are the same as the outer contour and size of the first substrate hemisphere.

[0026] Preferably: the molding device further comprises a first support seat, a first driving mechanism and a heating mechanism, the first support seat is provided with a plurality of mounting grooves, the molding device comprises a plurality of the first molding dies, and the plurality of the first molding dies are arranged in the plurality of mounting grooves in a one-to-one correspondence; the first driving mechanism is connected to the first molding convex mold; the heating mechanism is used to heat the first molding dies or the first molding convex mold to 60-80°C;

[0027] The cutting device further comprises a second support seat, a second driving mechanism and a cutter, wherein the second forming concave die is connected to the second support seat, the second forming convex die is connected to the second driving mechanism, and the cutter comprises a U-shaped blade structure, and the U-shaped blade structure is used to cut the remaining material of the reflective hemisphere to be cut through the side;

[0028] The punching device also includes a supporting platform and a punching knife. After the punching positioning mechanism carries the first reflective hemisphere downward to contact the supporting platform, the punching knife performs the punching operation.

[0029] According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0030] The embodiment of the present application provides a passive spherical marker and a preparation method. The passive spherical marker is a spherical body, a first base hemisphere and a second base hemisphere are glued together by strong glue to form a complete sphere, a reflective hemisphere is glued on the sphere, and the passive spherical marker is installed on the optical marker support column of the surgical instrument, and is used to locate the position of the surgical instrument in optical navigation surgery. The roundness, accuracy, and consistency problems of the passive spherical marker are solved, and no secondary injection molding is required, and the process cost is low. It is worth promoting and using on a large scale.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0033] Figure 1 is a schematic structural diagram of a passive spherical marker provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic structural diagram of a first substrate hemisphere provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic structural diagram of a second substrate hemisphere provided by an embodiment of the present invention;

[0036] Figure 4 is a cross-sectional view of a spherical marker provided by an embodiment of the present invention;

[0037] Figure 5 It is a schematic diagram of the structure of a spherical marker connected to a marker support column provided by an embodiment of the present invention;

[0038] Figure 6 is a cross-sectional view of a spherical marker provided by an embodiment of the present invention being connected to a marker support column;

[0039] Figure 7 is a schematic structural diagram of a molding device provided by an embodiment of the present invention;

[0040] Figure 8 is a schematic structural diagram of a cutting device provided by an embodiment of the present invention;

[0041] Fig. 9It is a schematic diagram of the structure of the punching device provided in an embodiment of the present invention.

[0042] In the figure: a spherical marker 100, a spherical base 1, a first base hemisphere 11, a first mounting hole 111, a second base hemisphere 12, a connecting shaft 121, a spherical reflective shell 2, a first reflective hemisphere 21, a second mounting hole 211, a second reflective hemisphere 22, a marker support column 3, a molding device 4, a support seat 41, a mounting groove 411, a first driving mechanism 42, a cutting device 5, a second support seat 51, a second driving mechanism 52, a cutter 53, a punching device 6, a support platform 61, a punching positioning mechanism 62, a first molding punch 71, a first molding die 72, a second molding punch 81, a first molding die 82, a punching knife 91, a plastic sheet and a reflective film 10. DETAILED DESCRIPTION

[0043] The technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0044] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , is a passive spherical marker provided by an embodiment of the present invention, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the spherical marker 100 may include:

[0045] A spherical substrate 1, wherein the spherical substrate 1 comprises a first substrate hemisphere 11 and a second substrate hemisphere 12; the first substrate hemisphere 11 and the second substrate hemisphere 12 both have a non-solid structure and are both made by injection molding;

[0046] A spherical reflective shell 2, wherein the spherical reflective shell 2 comprises a first reflective hemisphere 21 and a second reflective hemisphere 22, wherein the first reflective hemisphere 21 and the second reflective hemisphere 22 are both made of a composite material consisting of a plastic sheet and a reflective film; the first reflective hemisphere 21 and the second reflective hemisphere 22 are respectively and one-to-one matched and connected with the surfaces of the first base hemisphere 11 and the second base hemisphere 12; further, the first reflective hemisphere 21 and the second reflective hemisphere 22 are respectively and one-to-one matched and connected with the surfaces of the first base hemisphere 11 and the second base hemisphere 12 by bonding.

[0047] Among them, the first base hemisphere 11 and the second base hemisphere 12 are connected by shaft-hole matching and surface contact positioning to form a spherical structure; the first base hemisphere 11 is formed with a first mounting hole 111, and the first reflective hemisphere 21 is formed with a second mounting hole 211. After the first base hemisphere 11 is connected to the first reflective hemisphere 21, the first mounting hole 111 is opposite to the second mounting hole 211, so that the marker support column 3 can be connected to the passive spherical marker 100 through the second mounting hole 211 and the first mounting hole 111.

[0048] The passive spherical marker provided in the embodiment of the present application, the spherical base 1 is composed of two parts, the first base hemisphere 11 and the second base hemisphere 12 are glued together by strong glue to form a complete sphere, and a reflective hemisphere is pasted on each hemisphere. When in use, the passive spherical marker is installed on the optical marker support column 3 of the surgical instrument, and is used to locate the position of the surgical instrument in the optical navigation surgery. Since the solid structure will shrink when it is injected once, and the cost of the secondary injection molding is high, the first base hemisphere 11 and the second base hemisphere 12 provided in the embodiment of the present application are made of medical grade materials, and the mold injection molding process is used to ensure their consistency. The structure is hollow, which solves the shrinkage problem during injection molding and ensures roundness and precision. The reflective hemisphere is made of plastic sheet + reflective film, with high roundness and good reflective performance.

[0049] In order to improve the assembly accuracy of the spherical base 1 provided in the embodiment of the present application, the embodiment of the present application adopts an axial-hole matching and surface contact positioning method to connect the first base hemisphere 11 and the second base hemisphere 12. In order to achieve axial-hole matching, the embodiment of the present application can also provide that the second base hemisphere 12 is provided with a connecting shaft 121 inside, and the first base hemisphere 11 and the second base hemisphere 12 are connected by axial-hole matching with the first mounting hole 111 through the connecting shaft 121.

[0050] In order to realize the surface contact positioning method, the embodiment of the present application can also provide that the first base hemisphere 11 and the second base hemisphere 12 are both provided with a shoulder step structure at the contact position, so that the first base hemisphere 11 and the second base hemisphere 12 are connected to form a surface contact positioning structure. The first base hemisphere 11 and the second base hemisphere 12 are connected by precise shaft hole matching and surface contact positioning, and are connected with strong glue to form a spherical base 1. The matching is accurate and firm, and the reflective hemisphere is pasted on the spherical base 1 to make a passive spherical marker.

[0051] In order to further enable the spherical marker 100 provided in the embodiment of the present application to obtain precise positioning and moderate insertion and removal force when connected to the marker support column 3, the embodiment of the present application can also provide that the marker support column 3 is plugged and connected to the passive spherical marker 100 in a multi-faceted contact manner.

[0052] Furthermore, the front end face of the marker support column 3 abuts against the end face of the connecting shaft 121 to form a first contact surface, and the marker support column 3 has a variable diameter columnar structure so that the marker support column 3 forms a second contact surface, a third contact surface and a fourth contact surface with the inner wall of the first mounting hole 111.

[0053] The variable diameter columnar structure includes a first contraction section and a second contraction section, an inner convex structure is formed inside the first mounting hole 111, and the second contact surface is formed between the first contraction section and the second contraction section and at a position relative to the inner convex structure; the variable diameter columnar structure includes a straight tube section, and the third contact surface is formed at the position of the straight tube section; a wide mouth structure is formed at the outermost side of the first mounting hole 111, and the variable diameter columnar structure includes an outer expansion section, and the fourth contact surface is formed at the contact position between the wide mouth structure and the outer expansion section.

[0054] When in use, the passive spherical marker is installed on the optical marker support column 3, and the passive spherical marker and the optical marker support column 3 are in contact and matched through a, b, c, and d, so that the passive spherical marker and the optical marker support column 3 are accurately matched and the insertion and extraction force is moderate.

[0055] Since the first base hemisphere 11 and the second base hemisphere 12 provided in the embodiment of the present application both adopt a hollow structure, in order to improve the strength of the first base hemisphere 11 and the second base hemisphere 12, the embodiment of the present application can also provide that the first base hemisphere 11 and the second base hemisphere 12 are each formed with a plurality of reinforcing support plates inside.

[0056] The specific working process of the passive spherical marker provided in the embodiment of the present application is as follows:

[0057] Before the operation, the passive spherical marker is mounted on the optical marker support column 3 of the surgical instrument by snapping. The optical positioning system realizes the positioning of the surgical instrument by emitting infrared light, which is reflected by the passive spherical marker and identifying the small ball collection composed of the passive spherical marker.

[0058] In summary, the passive spherical marker provided by the present application, the first base hemisphere 11 and the second base hemisphere 12 are glued together by strong glue to form a complete sphere, and the reflective hemisphere is glued on the sphere. The passive spherical marker is installed on the optical marker support column 3 of the surgical instrument, and is used to locate the position of the surgical instrument in the optical navigation surgery. The roundness, accuracy and consistency problems of the passive spherical marker are solved, and no secondary injection molding is required, and the process cost is low. It is worth promoting and using on a large scale.

[0059] In order to further improve the processing accuracy of the spherical marker provided in the embodiment of the present application and ensure the consistency of each spherical marker, the embodiment of the present application may also provide a method for preparing the above-mentioned passive spherical marker, which may include:

[0060] The first base hemisphere 11 and the second base hemisphere 12 are respectively manufactured by using medical grade materials through injection molding process, and the first base hemisphere 11 and the second base hemisphere 12 are assembled to form the spherical base 1;

[0061] The reflective hemisphere to be cut is obtained by using the molding device 4;

[0062] Using a cutting device 5 to cut the semi-finished product to obtain the first reflective hemisphere 21 and the second reflective hemisphere 22;

[0063] Punching the first reflective hemisphere 21 using a punching device 6 to form the second mounting hole 211 at the center of the bottom of the first reflective hemisphere 21;

[0064] The molding device 4 includes a first molding convex mold 71 and a first molding concave mold 72, and the cutting device 5 includes a second molding convex mold 81 and a second molding concave mold 82. The outer contour shape and size of the first molding convex mold 71 are the same as the outer contour and size of the second base hemisphere 12.

[0065] The punching device 6 includes a punching positioning mechanism 62 , and the outer contour shape and size of the punching positioning mechanism 62 are the same as the outer contour and size of the first base hemisphere 11 .

[0066] Further, such as Figure 7 , Figure 8 , Fig. 9As shown, the molding device 4 further includes a first support seat 41, a first driving mechanism 42 and a heating mechanism, the first support seat 41 is provided with a plurality of mounting grooves 411, the molding device 4 includes a plurality of first molding dies 72, and the plurality of first molding dies 72 are arranged in the plurality of mounting grooves 411 in a one-to-one correspondence; the first driving mechanism 42 is connected to the first molding convex mold 71; the heating mechanism is used to heat the first molding dies 72 or the first molding convex mold 71 to 60-80°C;

[0067] The cutting device 5 further includes a second support seat 51, a second driving mechanism 52 and a cutter 53, the second forming die 82 is connected to the second support seat 51, the second forming die 81 is connected to the second driving mechanism 52, and the cutter 53 includes a U-shaped blade structure, and the U-shaped blade structure is used to cut the remaining material of the reflective hemisphere to be cut through the side;

[0068] The punching device 6 further includes a supporting platform 61 and a punching knife 91 . After the punching positioning mechanism 62 carries the first reflective hemisphere 21 downward to contact the supporting platform 61 , the punching knife 91 performs a punching operation.

[0069] In the method for preparing the passive spherical marker provided in the embodiment of the present application, the first base hemisphere 11 and the second base hemisphere 12 are injection molded using the same mold, and a hollow structure is used to ensure that there will be no shrinkage problem during the injection molding process, and to ensure that the structures and sizes of the various hemispheres obtained by processing are consistent. When processing the reflective hemisphere, the molding device 4 and the cutting device 5 both use a molding punch and a molding die with the same structure to cooperate, so that during the processing, the reflective hemispheres formed have the same contour structure and size. Since the reflective hemispheres are internally supported by the first molding punch 71, the second molding punch 81 and the punching positioning mechanism 62 during the processing of each process, it can be ensured that the reflective hemispheres will not be deformed during the processing of each process, further improving the processing accuracy.

[0070] In addition, the molding device 4 provided in the embodiment of the present application can be provided with a plurality of installation grooves 411 at the same time, and a first molding concave mold 72 can be provided in each installation groove 411. Then, by adapting the same number of first molding convex molds 71, a plurality of reflective hemispheres can be processed at the same time, thereby effectively improving the processing efficiency.

[0071] In practical applications, the various devices for processing and manufacturing the reflective hemisphere provided in the embodiments of the present application can be fixed on the same supporting platform. In specific implementation, the specific working process of the device is as follows:

[0072] Laminating the plastic sheet and the reflective film together to obtain the plastic sheet and the reflective film 10;

[0073] The first molding concave mold 72 of the molding device 4 is set in the corresponding installation groove 411, and the temperature of the molding device 4 is set between 60°C and 80°C by the heating mechanism; the laminated reflective film assembly is placed on the first molding concave mold 72, and the first driving mechanism 42 is operated to press down so that the first molding convex mold 71 at the front end of the ejector pin enters the first molding concave mold 72, and then the first driving mechanism 42 is operated to drive the first molding convex mold 71 to rise, and then the molded reflective film assembly is removed to obtain the reflective hemisphere to be cut.

[0074] The second forming concave die 82 of the cutting device 5 is fixed on the second supporting seat 51, and the formed reflective hemisphere to be cut is placed in the second forming concave die 82 of the cutting device 5. The second driving mechanism 52 of the cutting device 5 is operated to press the second forming convex die 81 down to the bottom of the reflective film, and the cutter 53 is used to cut the excess part of the reflective film assembly, and finally a hemispherical reflective film assembly is formed to obtain a reflective hemisphere.

[0075] Another reflective hemisphere is manufactured in the same manner to obtain a first reflective hemisphere 21 and a second reflective hemisphere 22 .

[0076] A punching device 6 is used to punch a hole at the bottom center of a reflective hemisphere.

[0077] The punched reflective hemisphere and the unpunched reflective hemisphere are respectively pasted on the spherical substrate to form a finished spherical marker.

[0078] The method for preparing the passive spherical marker provided in the embodiment of the present application solves the problems of roundness, accuracy and consistency of the spherical marker, and has a simple processing technology and low cost.

[0079] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0080] It can be known from the description of the above implementation methods that those skilled in the art can clearly understand that the present application can be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product can be stored in a storage medium such as ROM / RAM, a disk, an optical disk, etc., and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application or certain parts of the embodiments.

[0081] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for preparing a passive spherical marker, characterized in that: The passive spherical markers include: A spherical substrate, the spherical substrate comprising a first substrate hemisphere and a second substrate hemisphere; the first substrate hemisphere and the second substrate hemisphere both have a non-solid structure and are both made by injection molding; A spherical reflective shell, comprising a first reflective hemisphere and a second reflective hemisphere, wherein the first reflective hemisphere and the second reflective hemisphere are both made of a composite material consisting of a plastic sheet and a reflective film; the first reflective hemisphere and the second reflective hemisphere are respectively connected to the surfaces of the first base hemisphere and the second base hemisphere in a one-to-one correspondence; The first base hemisphere and the second base hemisphere are connected by shaft-hole matching and surface contact positioning to form a spherical structure; the first base hemisphere and the second base hemisphere are both formed with shoulder step structures at the contact positions, so that the first base hemisphere and the second base hemisphere are connected to form a surface contact positioning structure; The first base hemisphere is formed with a first mounting hole, the first reflective hemisphere is formed with a second mounting hole, and after the first base hemisphere is connected to the first reflective hemisphere, the first mounting hole is opposite to the second mounting hole, so that the marker support column is connected to the passive spherical marker through the second mounting hole and the first mounting hole; A connecting shaft is provided inside the second base hemisphere, and the first base hemisphere and the second base hemisphere are connected by shaft-hole matching through the connecting shaft and the first mounting hole; the marker support column is connected to the passive spherical marker in a multi-faceted contact manner; The front end surface of the marker support column abuts against the end surface of the connecting shaft to form a first contact surface, and the marker support column has a variable diameter columnar structure, so that the marker support column and the inner wall of the first mounting hole form a second contact surface, a third contact surface and a fourth contact surface; The variable diameter columnar structure includes a first contraction section and a second contraction section, an inner convex structure is formed inside the first mounting hole, and the second contact surface is formed between the first contraction section and the second contraction section and at a position relative to the inner convex structure; the variable diameter columnar structure includes a straight tube section, and the third contact surface is formed at the position of the straight tube section; a wide-mouth structure is formed at the outermost side of the first mounting hole, the variable diameter columnar structure includes an outer expansion section, and the fourth contact surface is formed at a contact position between the wide-mouth structure and the outer expansion section; The method comprises: The first base hemisphere and the second base hemisphere are respectively manufactured by using medical-grade materials through an injection molding process, and the first base hemisphere and the second base hemisphere are assembled to form the spherical base; The reflective hemisphere to be cut is obtained by using a molding device; Using a cutting device to cut the semi-finished product to obtain the first reflective hemisphere and the second reflective hemisphere; Punching the first reflective hemisphere by using a punching device to form the second mounting hole at the center of the bottom of the first reflective hemisphere; Wherein, the molding device comprises a first molding convex mold and a first molding concave mold, and the cutting device comprises a second molding convex mold and a second molding concave mold, and the outer contour shape and size of the first molding convex mold are the same as the outer contour and size of the second base hemisphere; The punching device comprises a punching positioning mechanism, the outer contour shape and size of the punching positioning mechanism are the same as the outer contour and size of the first substrate hemisphere.

2. The method according to claim 1, characterized in that The molding device further comprises a first support seat, a first driving mechanism and a heating mechanism, wherein the first support seat is provided with a plurality of mounting grooves, and the molding device comprises a plurality of the first molding dies, wherein the plurality of the first molding dies are arranged in the plurality of mounting grooves in a one-to-one correspondence; the first driving mechanism is connected to the first molding convex mold; the heating mechanism is used to heat the first molding dies or the first molding convex mold to 60-80°C; The cutting device further comprises a second support seat, a second driving mechanism and a cutter, wherein the second forming concave die is connected to the second support seat, the second forming convex die is connected to the second driving mechanism, and the cutter comprises a U-shaped blade structure, and the U-shaped blade structure is used to cut the remaining material of the reflective hemisphere to be cut through the side; The punching device also includes a supporting platform and a punching knife. After the punching positioning mechanism carries the first reflective hemisphere downward to contact the supporting platform, the punching knife performs the punching operation.

3. The method according to claim 1, characterized in that The first reflective hemisphere and the second reflective hemisphere are respectively connected to the surfaces of the first base hemisphere and the second base hemisphere in a one-to-one correspondence manner by bonding.

4. The method according to claim 1, characterized in that A plurality of reinforcing support plates are formed inside each of the first base hemisphere and the second base hemisphere.

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