CN112168430A - Artificial prosthesis for treating short-tube bone dry bone defect - Google Patents
Artificial prosthesis for treating short-tube bone dry bone defect Download PDFInfo
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- CN112168430A CN112168430A CN202011176077.6A CN202011176077A CN112168430A CN 112168430 A CN112168430 A CN 112168430A CN 202011176077 A CN202011176077 A CN 202011176077A CN 112168430 A CN112168430 A CN 112168430A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/28—Bones
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Abstract
The invention provides an artificial prosthesis for treating short-tube bone dry bone defects, and relates to the technical field of medical prostheses. The artificial prosthesis for treating the short-tube bone trunk bone defect comprises a first end, a second end, a first connecting rod and a second connecting rod which can be mutually connected; the outer walls of the first end head and the second end head are both provided with external threads connected with the bone end of a patient; the first connecting rod is connected with the first end through a first connecting piece, and the second connecting rod is connected with the second end through a second connecting piece; the first connecting rod is connected with the second connecting rod through a third connecting piece. The technical effect of good use effect is achieved.
Description
Technical Field
The invention relates to the technical field of medical prosthesis, in particular to an artificial prosthesis for treating short-tube bone dry bone defect.
Background
With the progress and development of medical diagnosis and treatment technology, limb protection surgery is currently the mainstream treatment method for malignant bone tumor; meanwhile, structural bone defects caused by severe trauma, infection and other factors also require bone tissue reconstruction to restore the function of the limb. Bone tumors can theoretically occur in various parts, short tubular bones of limbs are one of the common metastatic parts in advanced malignant tumors, and the design and the use method of the prosthesis are different according to different occurrence parts. The current research on prostheses is mainly focused on the large weight-bearing joints of the knee, hip, etc., and these large joint prostheses are widely used in clinical practice, while there is little in-depth research on prostheses of the bony trunk of the short tubular bones of the extremities.
At present, research and development of a diaphysis prosthesis of a short canal bone are relatively lagged, most of the diaphysis prostheses of the short canal bone in the prior art adopt a bone cement fixing mode, when the bone cement fixing mode is adopted, the operation requirement on prosthesis implantation is high, the prosthesis is generally required to be implanted accurately at one time, the prosthesis and host bone are required to be maintained to be relatively fixed before the bone cement is completely cured, once the bone cement is cured, the prosthesis is difficult to adjust again, if the position of the prosthesis is repeatedly adjusted before the bone cement is cured or the prosthesis and the host bone are not maintained to be relatively fixed, the stability of the prosthesis is reduced, and complications such as early loosening, falling out, sedimentation and the like of the prosthesis are easily caused. Moreover, the service life of the prosthesis fixed by bone cement is relatively short, the second-stage revision operation after the prosthesis fails is almost inevitable, and some cases can solve the problem even by performing multiple operations, while the prosthesis fixed by bone cement has higher difficulty of the prosthesis revision operation, more complications, poor postoperative effect and higher disability rate. Furthermore, in cases of bone defects in the short tubular bones of the limbs due to severe trauma and infection, bone tissue reconstruction is often required by bone prosthesis, and the same disadvantages are encountered with bone cement fixation.
Therefore, it is an important technical problem to be solved by those skilled in the art to provide an artificial prosthesis for treating short-tube bone dry bone defect with good use effect.
Disclosure of Invention
The invention aims to provide an artificial prosthesis for treating short-tube bone trunk bone defects, so as to solve the technical problem of poor use effect of the prosthesis in the prior art.
In a first aspect, an embodiment of the present invention provides an artificial prosthesis for treating a short-tube bone trunk defect, including a first end, a second end, and a first connecting rod and a second connecting rod that can be connected to each other;
the outer walls of the first end head and the second end head are both provided with external threads connected with the bone end of a patient;
the first connecting rod is connected with the first end through a first connecting piece, and the second connecting rod is connected with the second end through a second connecting piece;
the first connecting rod is connected with the second connecting rod through a third connecting piece.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a first threaded hole is formed in the first end, and a first stepped unthreaded hole corresponding to the first threaded hole is formed in the first connecting rod;
the first step unthreaded hole link up the first connecting rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a first positioning hole is formed in the first end, and a first positioning protrusion corresponding to the first positioning hole is disposed on the first connecting rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a cross section of the first positioning hole and a cross section of the first positioning protrusion are both polygonal.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a second threaded hole is formed in the second end, and a second stepped optical hole corresponding to the second threaded hole is formed in the second connecting rod;
the second stepped light hole penetrates through the second connecting rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a second positioning hole is formed in the second end, and a second positioning protrusion corresponding to the second positioning hole is disposed on the second connecting rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a cross section of the second positioning hole and a cross section of the second positioning protrusion are both polygonal.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein a first connection chuck is disposed on the first connection rod, and a second connection chuck adapted to the first connection chuck is disposed on the second connection rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein each of the first connecting rods is provided with a third threaded hole, and the second connecting rod is provided with a first countersunk hole corresponding to the third threaded hole;
and fourth threaded holes are formed in the first connecting rod, and second countersunk holes corresponding to the fourth threaded holes are formed in the second connecting rod.
With reference to the first aspect, an embodiment of the present invention provides a possible implementation manner of the first aspect, wherein outer sidewalls of the first connecting rod and the second connecting rod form an included angle of 0 to 10 degrees with a vertical plane.
Has the advantages that:
the invention provides an artificial prosthesis for treating short-tube bone trunk bone defects, which comprises a first end, a second end, a first connecting rod and a second connecting rod, wherein the first connecting rod and the second connecting rod can be connected with each other; the outer walls of the first end head and the second end head are both provided with external threads connected with the bone end of a patient; the first connecting rod is connected with the first end through a first connecting piece, and the second connecting rod is connected with the second end through a second connecting piece; the first connecting rod is connected with the second connecting rod through a third connecting piece.
When specifically using, medical staff is earlier repaiied patient's bone tip, then screw in first end and second end respectively patient's bone tip through the external screw thread, then medical staff is connected head rod and first end through first connecting piece, be connected second connecting rod and second end through the second connecting piece, medical staff links together head rod and second connecting rod through the third connecting piece at last, through such setting, can guarantee that the defective artificial prosthesis of treatment nozzle stub backbone bone is in the same place with patient's bone tip is firm, reduce the defective artificial prosthesis of treatment nozzle stub bone and appear not hard up probability, reduce the probability that bad symptom takes place for the postoperative, improve patient's postoperative and experience.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of an artificial prosthesis for treating a short-tube bone trunk bone defect according to an embodiment of the invention;
FIG. 2 is a schematic view of a first connecting rod of the artificial prosthesis for treating a short-tubular bone trunk defect according to the embodiment of the present invention;
fig. 3 is a schematic view of a second connecting rod of the artificial prosthesis for treating a short-tube bone trunk defect provided by the embodiment of the invention.
Icon:
100-a first end; 110-a first threaded hole; 120-a first locating hole;
200-a second end; 210-a second threaded hole; 220-a second positioning hole;
300-first connecting rod; 310-first stepped optical apertures; 320-a first positioning projection; 330-first connecting chuck; 340-third threaded hole; 350-a fourth threaded hole;
400-a second connecting rod; 410-second stepped optical apertures; 420-a second positioning projection; 430-a second connection chuck; 440-first countersunk hole; 450-second countersunk hole;
500-bone end.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Referring to fig. 1, 2 and 3, the present embodiment provides an artificial prosthesis for treating a short-tube shaft bone defect, including a first tip 100, a second tip 200, and a first connecting rod 300 and a second connecting rod 400 which can be connected to each other; the outer walls of the first end 100 and the second end 200 are both provided with external threads connected with the bone end 500 of the patient; the first connecting rod 300 is connected with the first end 100 through a first connecting member, and the second connecting rod 400 is connected with the second end 200 through a second connecting member; the first connecting rod 300 is connected to the second connecting rod 400 through a third connecting member.
When in specific use, medical staff first trims 500 parts of the bone end of a patient, then screws the first end head 100 and the second end head 200 into 500 parts of the bone end of the patient respectively through the external thread, then the medical staff connects the first connecting rod 300 with the first end head 100 through the first connecting piece, connect the second connecting rod 400 with the second end head 200 through the second connecting piece, finally the medical staff connects the first connecting rod 300 with the second connecting rod 400 through the third connecting piece, through the arrangement, the artificial prosthesis for treating the short-pipe backbone bone defect and the bone end 500 of the patient are firmly connected together, the probability of looseness of the artificial prosthesis for treating the short-pipe backbone bone defect is reduced, the probability of occurrence of adverse symptoms after operation is reduced, and the postoperative experience of the patient is improved.
It is specific, before implanting the defective artificial prosthesis of treatment short tube bone shaft bone that this embodiment provided into the patient, medical staff repaiies patient's bone end 500 earlier, after patient's bone end 500 is repaiied and is accomplished, first end 100 and second end 200 outer wall are provided with the external screw thread, medical staff can be convenient, swift with first end 100 and second end 200 screw in to patient's bone end 500, guarantee the steadiness of being connected of first end 100 and second end 200 two and patient's bone end 500 through the threaded connection mode, so that bad postoperative symptom can not appear in the normal life of postoperative of patient, guarantee the living standard of patient postoperative.
Specifically, after the first and second ends 100 and 200 are fixed to the bone end 500 of the patient, the medical staff can fix the first connecting rod 300 to the first end 100 via the first connecting member, and the medical staff can fix the second connecting rod 400 to the second end 200 via the second connecting member.
Also, the first connecting rod 300 can be connected with the second connecting rod 400 by the third connecting member, thereby improving the stability of the first connecting rod 300 and the second connecting rod 400.
Wherein the first tip 100 and the second tip 200 are coated with a hydroxyapatite biological coating to facilitate establishing initial stability and promoting bone ingrowth.
Referring to fig. 1, 2 and 3, in an alternative of this embodiment, a first threaded hole 110 is formed in a first terminal 100, and a first stepped unthreaded hole 310 corresponding to the first threaded hole 110 is formed in a first connecting rod 300; the first step unthreaded hole 310 penetrates the first connecting rod 300.
Specifically, one end of the first end 100, which is far away from the bone end 500 of the patient, is provided with a first threaded hole 110, the first connecting rod 300 is provided with a first stepped unthreaded hole 310, the first stepped unthreaded hole 310 can penetrate through the first connecting rod 300, and an axis of the first stepped unthreaded hole 310 coincides with an axis of the first connecting rod 300, in the process of connecting the first end 100 and the first connecting rod 300, the medical staff puts a first connecting piece into the first stepped unthreaded hole, and then the medical staff screws the first connecting piece into the first threaded hole 110 of the first end 100 through a tool, so that the first connecting rod 300 is firmly connected with the first end 100.
It should be noted that the first connecting piece can be a hexagon socket head cap screw, which is convenient for the medical staff to operate.
Referring to fig. 1, 2 and 3, in an alternative of this embodiment, a first positioning hole 120 is formed on the first terminal 100, and a first positioning protrusion 320 corresponding to the first positioning hole 120 is formed on the first connecting rod 300.
Specifically, when the first connecting rod 300 is connected to the first terminal 100, the first positioning protrusion 320 at the end of the first connecting rod 300 is inserted into the first positioning hole 120 formed in the first terminal 100, and the first connecting rod 300 can be prevented from moving relative to the first terminal 100 through the cooperation of the first positioning protrusion 320 and the first positioning hole 120, so that the stability of the first connecting rod 300 and the stability of the first terminal 100 are improved.
Referring to fig. 1, 2 and 3, in an alternative embodiment, the first positioning hole 120 and the first positioning protrusion 320 have polygonal cross sections.
Specifically, the first positioning hole 120 may be provided in a polygonal shape, and preferably, both the cross section of the first positioning hole 120 and the cross section of the first positioning protrusion 320 may be provided in a hexagonal shape or an octagonal shape.
Referring to fig. 1, 2 and 3, in an alternative of this embodiment, a second threaded hole 210 is formed in the second end 200, and a second stepped optical hole 410 corresponding to the second threaded hole 210 is formed in the second connecting rod 400; the second stepped optical hole 410 penetrates the second link 400.
Specifically, one end of the second end head 200, which is far away from the bone end 500 of the patient, is provided with a second threaded hole 210, the second connecting rod 400 is provided with a second stepped light hole 410, the second stepped light hole 410 can penetrate through the second connecting rod 400, the axis of the second stepped light hole 410 coincides with the axis of the second connecting rod 400, in the process of connecting the second end head 200 and the second connecting rod 400, medical staff puts a second connecting piece into the second stepped light, and then the medical staff screws the first connecting piece into the second threaded hole 210 of the second end head 200 through a tool, so that the second connecting rod 400 is firmly connected with the second end head 200.
It should be noted that the second connecting piece can adopt a hexagon socket head cap screw, which is convenient for the operation of medical staff.
Referring to fig. 1, 2 and 3, in an alternative embodiment of the present invention, a second positioning hole 220 is formed on the second end 200, and a second positioning protrusion 420 corresponding to the second positioning hole 220 is formed on the second connecting rod 400.
Specifically, when the second connecting rod 400 is connected to the second end head 200, the second positioning protrusion 420 at the end of the second connecting rod 400 is inserted into the second positioning hole 220 formed in the second end head 200, and the second connecting rod 400 can be prevented from moving relative to the second end head 200 through the cooperation between the second positioning protrusion 420 and the second positioning hole 220, so that the stability of the second connecting rod 400 and the stability of the second end head 200 are improved.
Referring to fig. 1, 2 and 3, in an alternative embodiment, the cross section of the second positioning hole 220 and the cross section of the second positioning protrusion 420 are both polygonal.
Specifically, the second positioning hole 220 may be provided in a polygonal shape, and preferably, both the cross section of the second positioning hole 220 and the cross section of the second positioning protrusion 420 may be provided in a hexagonal shape or an octagonal shape.
Referring to fig. 1, 2 and 3, in an alternative of the present embodiment, a first connection chuck 330 is provided on a first connection rod 300, and a second connection rod 400 is provided with a second connection chuck 430 fitted with the first connection chuck 330.
Specifically, a first connection chuck 330 is disposed at an end of the first connection rod 300 away from the first end 100, a second connection chuck 430 is disposed at an end of the second connection rod 400 away from the second end 200, and the first connection chuck 330 can be connected to the second connection chuck 430.
The first connecting chuck 330 and the second connecting chuck 430 are identical in structure and symmetrical to each other, so that the first connecting chuck 330 can be connected with the second connecting chuck 430.
Both the first connecting chuck 330 and the second connecting chuck 430 include a projection and a recess, and the projection is located at an end portion, and when the first connecting chuck 330 and the second connecting chuck 430 are connected, the projection of the first connecting chuck 330 can be inserted into the recess of the second connecting chuck 430, and the projection of the second connecting chuck 430 can be inserted into the recess of the first connecting chuck 330.
Referring to fig. 1, 2 and 3, in an alternative of this embodiment, third threaded holes 340 are provided in the first connecting rods 300, and first countersunk holes 440 corresponding to the third threaded holes 340 are provided in the second connecting rods 400; the first connecting rods 300 are all provided with fourth threaded holes 350, and the second connecting rods 400 are provided with second countersunk holes 450 corresponding to the fourth threaded holes 350.
Specifically, when the first connecting rod 300 and the second connecting rod 400 are connected, the medical staff may clamp the first connecting rod 300 and the second connecting rod 400 together, and then insert a third connecting member into the first countersunk smooth hole 440 and the second countersunk smooth hole 450, so that the third connecting member in the first countersunk smooth hole 440 is connected to the third threaded hole 340, and the third connecting member in the second countersunk smooth hole 450 is connected to the fourth threaded hole 350.
It should be noted that the third connecting member may employ a countersunk bolt.
In an alternative of this embodiment, the outer sidewalls of both the first and second connecting rods 300 and 400 are at an angle of 0-10 degrees to the vertical plane.
Specifically, the outer sidewalls of both the first and second connecting rods 300 and 400 are provided to have a slope, and the outer sidewalls of both the first and second connecting rods 300 and 400 have an angle of 5 degrees with the vertical plane. Through the arrangement, the artificial prosthesis for treating the short-tube bone shaft bone defect provided by the embodiment meets the bending angle of the metacarpal bone.
It should be further noted that in another embodiment of the artificial prosthesis for treating a defect of a shaft of a short canal bone, provided by this embodiment, the axis of the shaft portion of the first connecting rod 300 intersects with the axis of the first positioning protrusion 320, and the included angle therebetween is between 0 and 10 degrees, the axis of the shaft portion of the second connecting rod 400 intersects with the axis of the second positioning protrusion 420, and the included angle therebetween is between 0 and 10 degrees, that is, the axis of the first connecting rod 300 intersects with the axis of the first end 100, and the axis of the second connecting rod 400 intersects with the axis of the second end 200, so that the implanted prosthesis can conform to the curvature of the original metacarpal bone of the patient, thereby covering patients with different curvature of the metacarpal bone, and the medical staff can select the prosthesis according to the actual conditions of the patients.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An artificial prosthesis for treating short tube diaphysis bone defects, comprising: a first end (100), a second end (200), and a first connecting rod (300) and a second connecting rod (400) that are connectable to each other;
the outer walls of the first end head (100) and the second end head (200) are both provided with external threads connected with a bone end (500) of a patient;
the first connecting rod (300) is connected with the first end (100) through a first connecting piece, and the second connecting rod (400) is connected with the second end (200) through a second connecting piece;
the first connecting rod (300) is connected with the second connecting rod (400) through a third connecting piece.
2. The artificial prosthesis for treating the short-tube bone shaft defect according to claim 1, wherein the first end (100) is provided with a first threaded hole (110), and the first connecting rod (300) is provided with a first stepped unthreaded hole (310) corresponding to the first threaded hole (110);
the first step lighting hole (310) penetrates the first connecting rod (300).
3. The artificial prosthesis for treating short-tube bone trunk defect according to claim 2, wherein the first end (100) is provided with a first positioning hole (120), and the first connecting rod (300) is provided with a first positioning protrusion (320) corresponding to the first positioning hole (120).
4. The prosthesis for treating short canal shaft bone defect of claim 3, wherein the cross section of the first positioning hole (120) and the cross section of the first positioning protrusion (320) are both polygonal.
5. The artificial prosthesis for treating the short-tube bone shaft defect according to claim 1, wherein a second threaded hole (210) is formed in the second end head (200), and a second stepped unthreaded hole (410) corresponding to the second threaded hole (210) is formed in the second connecting rod (400);
the second stepped light hole (410) penetrates the second connection rod (400).
6. The artificial prosthesis for treating short-tube bone shaft defect according to claim 5, wherein the second end head (200) is provided with a second positioning hole (220), and the second connecting rod (400) is provided with a second positioning protrusion (420) corresponding to the second positioning hole (220).
7. The prosthesis for treating short canal shaft bone defect of claim 6, wherein the cross section of the second positioning hole (220) and the cross section of the second positioning protrusion (420) are both polygonal.
8. The artificial prosthesis for treating a short tubular bone shaft defect according to any one of claims 1 to 7, wherein the first connecting rod (300) is provided with a first connecting dop (330), and the second connecting rod (400) is provided with a second connecting dop (430) adapted to the first connecting dop (330).
9. The artificial prosthesis for treating short canal bone shaft defect of claim 8, wherein the first connecting rods (300) are provided with third threaded holes (340), and the second connecting rods (400) are provided with first countersunk holes (440) corresponding to the third threaded holes (340);
fourth threaded holes (350) are formed in the first connecting rods (300), and second countersunk holes (450) corresponding to the fourth threaded holes (350) are formed in the second connecting rods (400).
10. The prosthesis for treating a short canal shaft bone defect according to any one of claims 1 to 7, wherein the outer side walls of both the first connecting rod (300) and the second connecting rod (400) form an angle of 0-10 degrees with the vertical plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011176077.6A CN112168430A (en) | 2020-10-28 | 2020-10-28 | Artificial prosthesis for treating short-tube bone dry bone defect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011176077.6A CN112168430A (en) | 2020-10-28 | 2020-10-28 | Artificial prosthesis for treating short-tube bone dry bone defect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112168430A true CN112168430A (en) | 2021-01-05 |
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ID=73916439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011176077.6A Pending CN112168430A (en) | 2020-10-28 | 2020-10-28 | Artificial prosthesis for treating short-tube bone dry bone defect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112168430A (en) |
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2020
- 2020-10-28 CN CN202011176077.6A patent/CN112168430A/en active Pending
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