CN108656580B - Application of carbon fiber in preparation material of nonmagnetic medical device and preparation method of nonmagnetic medical device - Google Patents
Application of carbon fiber in preparation material of nonmagnetic medical device and preparation method of nonmagnetic medical device Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/46—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using matched moulds, e.g. for deforming sheet moulding compounds [SMC] or prepregs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/06—Fibrous reinforcements only
- B29C70/10—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres
- B29C70/16—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length
- B29C70/20—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres
- B29C70/202—Fibrous reinforcements only characterised by the structure of fibrous reinforcements, e.g. hollow fibres using fibres of substantial or continuous length oriented in a single direction, e.g. roofing or other parallel fibres arranged in parallel planes or structures of fibres crossing at substantial angles, e.g. cross-moulding compound [XMC]
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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Abstract
The invention discloses an application of carbon fiber in a preparation material of a nonmagnetic medical device and a preparation method of the nonmagnetic medical device, relating to the field of preparation materials of medical instruments and comprising thermosetting resin and a carbon fiber material; wherein the thermosetting resin is an adhesive; wherein, the weight ratio of the thermosetting resin to the carbon fiber is (5-28) to (72-95), preferably (9-24): (76-91), more preferably (18-20): (80-82), by using thermosetting resin, the roughness of the surface of the fiber is improved, the surface area of the surface of the carbon fiber is increased, the interface bonding property between the carbon fiber and a resin matrix is improved, the overall performance of the composite material is excellent, the non-magnetic medical transfer bed manufactured by adopting the non-magnetic carbon fiber composite material is only 16kg, the bearing capacity reaches 150kg, the tensile strength is more than 3500MPa, the corrosion resistance is good, and the non-magnetic medical transfer bed is non-magnetic and can be completely used in an MR examination room.
Description
Technical Field
The invention relates to the field of medical instrument preparation materials, in particular to application of carbon fiber to a nonmagnetic medical device.
Background
The nuclear magnetic equipment has strong magnetism, the magnetism can not disappear under the normal working and non-working states, and huge damage can be brought when ferromagnetic objects are close to the nuclear magnetic equipment, for example, when the ferromagnetic objects such as a common transfer bed, a wheelchair, an oxygen tank and the like are brought into a high magnetic field of the nuclear magnetic equipment, the ferromagnetic objects fly to machines like shells and bullets, and the missile effect or the projectile damage occurs.
Because the existing medical devices are mostly made of metal materials, for example, the medical transfer bed has more functions and complex structure, and the connecting mechanisms are made of metal materials and are not suitable for a nuclear magnetic room.
Carbon fiber (CF for short) is a novel fiber material of high-strength and high-modulus fiber with carbon content of more than 95%, and is formed by piling up organic fibers such as flake graphite microcrystals along the axial direction of the fiber and carrying out carbonization and graphitization treatment, and the carbon fiber is flexible and rigid outside and lighter than metal aluminum but higher in strength than steel, has the characteristics of corrosion resistance and high modulus, and is an important material in the aspects of national defense, military industry and civilian use. The high-strength high-temperature-resistant high-temperature. Compared with the traditional glass fiber, the Young modulus is more than 3 times of that of the traditional glass fiber; compared with Kevlar fiber, the Young's modulus is about 2 times of that of Kevlar fiber, and the Kevlar fiber is insoluble and does not swell in organic solvents, acids and alkalis and has outstanding corrosion resistance.
Disclosure of Invention
The preparation method adopts a compression molding integrated structure, and the nonmagnetic medical device with excellent mechanical property can form pressure bearing capacity without bolt connection, can be used for assembling the medical transfer bed, can also be used for assembling a nonmagnetic medical frame, has a simple structure, does not use any metal material, does not generate missile effect or casting damage, and is completely suitable for the nuclear magnetic chamber. In addition, by using the white carbon black and the carbon powder material, the roughness of the surface of the carbon fiber is improved, the surface area of the surface of the carbon fiber is increased, the interface bonding property between the carbon fiber and a resin matrix is improved, and the overall excellent performance of a non-magnetic medical device is improved, especially the manufacture of a medical transfer bed.
In order to achieve the purpose of the invention, the invention firstly provides the application of the carbon fiber in the preparation material of the non-magnetic medical device, wherein the preparation material of the non-magnetic medical device comprises thermosetting resin and carbon fiber materials, and the weight ratio of the thermosetting resin to the carbon fiber materials is (5-28) to (72-95), preferably (9-24): (76-91), more preferably (18-20): (80-82).
Wherein the thermosetting resin is selected from one of epoxy resin and thermo-sensitive shape memory polymer.
Wherein the thermotropic sensitive shape memory polymer is an epoxy resin introduced with temperature-induced dynamic covalent bonds with ester exchange properties.
Wherein, the thermosetting resin also comprises one or a compound of nano carbon powder or white carbon black.
Wherein the mass percentage content of the nano carbon powder in the thermosetting resin is less than 30%, preferably less than 25%, and further preferably less than 20%;
wherein, the content of white carbon black in the thermosetting resin is less than 12% by mass, preferably less than 8% by mass, and further preferably less than 5% by mass.
The carbon fiber material comprises first carbon fiber cloth with carbon fiber tows arranged in a staggered mode, and second carbon fiber cloth with carbon fiber tows arranged in parallel;
the carbon fiber material can be formed by sequentially and alternately overlapping first carbon fiber cloth and second carbon fiber cloth, or sequentially overlapping the first carbon fiber cloth and then sequentially overlapping the second carbon fiber cloth, or sequentially overlapping the second carbon fiber cloth and then sequentially overlapping the second carbon fiber cloth and the first carbon fiber cloth.
Wherein the modulus of the carbon fiber is more than or equal to 250 Gpa.
The thickness and the width of the first carbon fiber cloth and the second carbon fiber cloth are selected according to the requirements of the prepared device.
In order to achieve the technical purpose of the invention, the invention also provides a preparation method of the nonmagnetic medical device, which comprises the following steps: and (3) coating the surface of the carbon fiber material with thermosetting resin, and then carrying out compression molding treatment on the carbon fiber material coated with thermosetting resin to obtain the nonmagnetic medical device.
The mold filling temperature of the compression molding treatment is 20-40 ℃, the heating rate is 0.5-2 min/DEG C, the curing temperature is 130-150 ℃, the heat preservation time is 20-60min, the pressure is 5-30MPa, the leveling time is 3-20 minutes, and the curing time is 10-60 minutes.
Preferably, the mold filling temperature of the compression molding treatment is 22-38 ℃, the temperature rising speed is 0.6-1.8 min/DEG C, the curing temperature is 133-145 ℃, the heat preservation time is 24-50min, the pressure is 8-27MPa, the leveling time is 5-17 min, and the curing time is 15-53 min.
Wherein, before coating the thermosetting resin on the surface of the carbon fiber material, the method further comprises the following steps: adding the nano carbon powder into the crushed thermosetting resin, and uniformly stirring to obtain the thermosetting resin mixed with the nano carbon powder.
Preferably, the coating of the thermosetting resin on the surface of the carbon fiber material further comprises: and (3) mixing the gasified white carbon black with the nano carbon powder, adding the mixture into the crushed thermosetting resin, and stirring uniformly to obtain the thermosetting resin mixed with the gasified white carbon black and the nano carbon powder.
Wherein the non-magnetic medical device can be a device of auxiliary medical equipment used in a nuclear magnetic room, such as a medical transfer bed, a medical rack and the like.
Has the advantages that:
1. according to the application, the nano carbon powder and white carbon black are added into the binder, so that the roughness of the surface of the fiber is improved, the surface area of the surface of the carbon fiber is increased, the interface bonding property between the carbon fiber and a resin matrix is improved, the overall excellent performance of the composite material is improved, and the composite material can be stably applied to the manufacturing of medical equipment, especially the manufacturing of a medical transfer bed.
2. The non-magnetic medical transfer bed made of the non-magnetic carbon fiber composite material provided by the method has the weight of only 16kg, the bearing capacity of 150kg which is 20 times that of a common iron bed, the tensile strength of more than 3500MPa, good corrosion resistance and no magnetism, and can be completely used in an MR examination room.
Drawings
FIG. 1 is a schematic view of a non-magnetic medical transfer bed prepared in application example 1 of the present invention;
FIG. 2 is a schematic view of a cross beam support structure prepared by application example 1 of the present invention;
fig. 3 is a schematic structural view of a longitudinal beam support prepared in application example 1 of the present invention.
In the figure, 1 is a bed board, 2 is a cross beam bracket, and 3 is a longitudinal beam bracket.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. These examples are only illustrative and not intended to limit the scope of the present invention. Experimental procedures in the following examples, where specific experimental conditions are not specified, are generally obtained commercially according to conventional conditions or according to conditions recommended by the manufacturer, and the sources of the ingredients not specified are not specified.
EXAMPLE 1 preparation of nonmagnetic medical device
Selecting epoxy resin as thermosetting resin, wherein the carbon fiber material is a fiber cloth sold in the market, the fiber material comprises a fiber cloth with a carbon fiber tow in a staggered arrangement, and the fiber cloth with the carbon fiber tow in a parallel arrangement, wherein the thermosetting resin and the carbon fiber cloth are mixed in parts by weight as 18: 82, the carbon fiber cloth is 4 layers, the surface layer is the fiber cloth with carbon fiber tows in a staggered arrangement, and the middle interlayer is the fiber cloth with carbon fiber tows in a parallel arrangement.
When the device is used, the epoxy resin is coated on the surface of the carbon fiber cloth, then the carbon fiber cloth is overlapped together, and compression molding processing is carried out, so that the non-magnetic carbon fiber composite material forms a device of required equipment.
The amount of the epoxy resin is 5 to 28 parts by weight, for example, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, etc., the amount of the carbon fiber material is 72 to 95 parts by weight, for example, 73, 74, 75, 76, 77, 78, 79, 80, 81, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, etc., and the number of carbon fiber layers may be 5, 6, or more as necessary.
EXAMPLE 2 preparation of nonmagnetic medical device
Selecting epoxy resin as thermosetting resin, adding nano carbon powder into the thermosetting resin, adding the carbon fiber material into commercially available fiber cloth, wherein the fiber material comprises fiber cloth with carbon fiber tows arranged in a staggered mode and fiber cloth with carbon fiber tows arranged in a parallel mode, adding the nano carbon powder into the epoxy resin, and uniformly stirring, wherein the weight ratio of the mixture to the carbon fiber material is 20:80, the carbon fiber material is 5 layers, the surface layer is the fiber cloth with the carbon fiber tows arranged in a staggered mode, the middle interlayer is the fiber cloth with the carbon fiber tows arranged in a parallel mode, the weight percentage of white carbon black in the mixture is 5%, and the weight percentage of the nano carbon powder in the mixture is 30%.
According to the invention, the nano carbon powder is added into the epoxy resin, so that the bonding force between the fiber cloth can be improved, the strength of the fiber cloth is enhanced, and the technical problem of poor strength of the epoxy resin is solved.
It should be noted that any value of the weight percentage of the nano carbon powder in the thermosetting resin within the range of less than 30% can achieve the technical object of the present invention, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, etc.
EXAMPLE 3 preparation of nonmagnetic medical device
The carbon fiber cloth used was 6 layers except that carbon nanopowder and fumed silica were added to the epoxy resin, and the other steps were the same as in example 1.
It should be noted that any value of fumed silica in the mixture with a weight percentage of less than 12% can achieve the technical purpose of the present invention, such as 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, etc.
EXAMPLE 4 preparation of nonmagnetic medical device
The process is the same as that of example 1 except that the thermo-sensitive shape memory polymer is used as the thermosetting resin, the carbon fiber cloth is 7 layers, the surface layer is the fiber cloth with the carbon fiber tows in a staggered arrangement, the interlayer is a mixed layer formed by alternately overlapping the fiber cloth with the carbon fiber tows in a parallel arrangement and the fiber cloth with the carbon fiber tows in a staggered arrangement, and the number of the fiber cloth with the carbon fiber tows in a staggered arrangement is larger than that of the fiber cloth with the carbon fiber tows in a parallel arrangement.
The invention uses the thermal sensitive shape memory polymer as the thermosetting resin, so that the toughness and the applicability are enhanced under the condition that the strength of the non-magnetic carbon fiber composite material is not changed.
EXAMPLE 5 preparation of medical devices
1. Proportioning and material preparation
The components are weighed according to the proportion of the embodiment, and according to the strength requirement of the medical device, first carbon fiber materials with carbon fiber tows arranged in a staggered mode and second carbon fiber materials with carbon fiber tows arranged in parallel are configured for standby.
2. Mixing treatment of raw materials
Gasifying the white carbon black by adopting a conventional method to obtain gas-phase white carbon black; and then sequentially adding the weighed nano carbon powder and the obtained fumed silica into the crushed adhesive, and uniformly stirring to obtain a mixture.
3. Preparation of medical devices
And cutting and configuring the first carbon fiber material and the second carbon fiber material according to the size specification requirement of the medical device.
And (3) coating the mixture obtained in the step (2) on the surfaces of the first carbon fiber material and the second carbon fiber material, and carrying out compression molding treatment to finally obtain the needed nonmagnetic medical device. The medical device may be a component of a medical transfer bed, such as a bed frame, e.g., a bed board, etc.
The adopted compression molding treatment is carried out by adopting the existing equipment and operation steps.
The mold filling temperature for compression molding treatment is 20-40 ℃, the heating rate is 0.5-2 min/DEG C, the curing temperature is 130-150 ℃, the heat preservation time is 20-60min, the pressure is 5-30MPa, the leveling time is 3-20 min, and the curing time is 10-60 min.
It should be noted that the operating conditions for performing compression molding according to the present invention are one of the contributions of the present invention, and the performance of the medical device is affected by the operating conditions which are too high or too low.
Application example 1 preparation of nonmagnetic medical transfer bed
1. Proportioning and material preparation
Preparing the components according to the components and the proportion of the examples 1 and 4 to obtain a material A and a material B, and preparing a first carbon fiber material with carbon fiber tows arranged in a staggered mode and a second carbon fiber material with carbon fiber tows arranged in parallel according to the strength requirement of a common medical transfer bed for later use
2. Preparation of medical devices
The material A and the material B are respectively subjected to compression molding treatment according to the method of example 5, the material A is respectively compressed into brackets 2 and 3 (shown in figure 1) of the medical transfer bed, and the material B is compressed into a bed board 1 of the medical transfer bed.
Wherein the mold filling temperature of the compression molding treatment is 32-37 ℃, the heating rate is 0.8-1.2 min/DEG C, the molding and curing temperature is 146-154 ℃, the heat preservation time is 28-33min, the pressure is 5-30MPa, the leveling time is 3-20 min, and the curing time is 12-20 min.
3. Assembly
And (3) sleeving the bracket of the nonmagnetic medical transfer bed prepared in the step (2) with the bed plate together to obtain the nonmagnetic medical transfer bed.
And 2, connecting the beam bracket of the nonmagnetic medical transfer bed prepared in the step 2 with the bed board and arranging the beam bracket at the lower end of the bed board, and connecting the longitudinal beam bracket with the nonmagnetic bed board through the beam bracket.
Specifically, the beam bracket includes: the first annular support frame arranged on one side of the bed plate and the second annular support frame arranged on the other side of the bed plate are integrally formed by adopting a compression molding processing method (as shown in figure 2).
Specifically, the stringer support includes: a first longitudinal beam bracket connected with the bed plate through a first upright post; and a second longitudinal beam bracket connected with the bed plate through a second upright post, which are integrally formed by adopting a compression molding processing method (as shown in figure 3).
4. Quality detection
Through determination, the non-magnetic medical transfer bed made of the non-magnetic carbon fiber composite material provided by the method has the weight of only 16kg, the bearing capacity of 150kg which is 20 times that of a common iron bed, the tensile strength of more than 3500MPa, good corrosion resistance and no magnetism, and can be completely used in an MR examination room.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The application of the carbon fiber as the preparation material of the non-magnetic medical device is characterized in that the preparation material of the non-magnetic medical device comprises thermosetting resin containing nano carbon powder or/and white carbon black and a carbon fiber material, and the weight ratio of the thermosetting resin to the carbon fiber material is 5-28: 72-95;
wherein the mass percentage content of the nano carbon powder in the thermosetting resin is less than 30 percent;
wherein the mass percent content of the white carbon black in the thermosetting resin is less than 12 percent;
wherein the thermosetting resin is selected from a thermo-sensitive shape memory polymer or a compound of epoxy resin and the thermo-sensitive shape memory polymer;
wherein the thermotropic sensitive shape memory polymer is an epoxy resin introduced with temperature-induced dynamic covalent bonds with ester exchange properties.
2. The use of the carbon fiber as a material for preparing a non-magnetic medical device according to claim 1, wherein the thermosetting resin containing nano carbon powder or/and white carbon black and the carbon fiber material are mixed in a weight ratio of 9-24: 76-91.
3. The use of the carbon fiber as a material for preparing a non-magnetic medical device according to claim 1, wherein the thermosetting resin containing nano carbon powder or/and white carbon black and the carbon fiber material are mixed in a weight ratio of 18-20: 80-82.
4. The use of carbon fibers as a material for the preparation of nonmagnetic medical devices as in claim 1, wherein the mass percent content of the carbon nanopowder in the thermosetting resin is less than 25%.
5. The use of carbon fibers as a material for the preparation of nonmagnetic medical devices as in claim 1, wherein the mass percentage of the carbon nanopowder in the thermosetting resin is less than 20%.
6. The use of carbon fibers as a material for the preparation of nonmagnetic medical devices as in claim 1, wherein the mass percentage of white carbon black in the thermosetting resin is less than 8%.
7. The use of carbon fibers as a material for the preparation of nonmagnetic medical devices as in claim 1, wherein the mass percentage of white carbon black in the thermosetting resin is less than 5%.
8. The use according to claim 1, wherein the carbon fiber material comprises a first carbon fiber cloth with carbon fiber tows arranged in a staggered manner, and a second carbon fiber cloth with carbon fiber tows arranged in a parallel manner;
the carbon fiber material is formed by sequentially and alternately superposing a first carbon fiber cloth and a second carbon fiber cloth, or sequentially superposing the first carbon fiber cloth and then sequentially superposing the first carbon fiber cloth and the second carbon fiber cloth, or sequentially superposing the second carbon fiber cloth and then sequentially superposing the second carbon fiber cloth and the first carbon fiber cloth.
9. A preparation method of a nonmagnetic medical device is characterized in that thermosetting resin is used for coating the surface of a carbon fiber material, and then compression molding treatment is carried out on the carbon fiber coated with the thermosetting resin to obtain the nonmagnetic medical device;
wherein the mold filling temperature of the compression molding treatment is 20-40 ℃, the heating rate is 0.5-2 ℃/min, the curing temperature is 130-150 ℃, the heat preservation time is 20-60min, the pressure is 5-30MPa, the leveling time is 3-20 min, and the curing time is 10-60 min;
wherein, before coating the thermosetting resin on the surface of the carbon fiber material, the method further comprises the following steps: adding nano carbon powder into the crushed thermosetting resin, and uniformly stirring to obtain thermosetting resin mixed with the nano carbon powder; or
Mixing gasified white carbon black with nano carbon powder, adding the mixture into the crushed thermosetting resin, and uniformly stirring to obtain the thermosetting resin mixed with gasified white carbon black and nano carbon powder;
wherein the thermosetting resin is selected from a thermo-sensitive shape memory polymer or a compound of epoxy resin and the thermo-sensitive shape memory polymer;
wherein the thermotropic sensitive shape memory polymer is an epoxy resin introduced with temperature-induced dynamic covalent bonds with ester exchange properties.
10. Use according to any one of claims 1 to 8, wherein the non-magnetic medical device is a device of an auxiliary medical apparatus for a nuclear magnetic room.
11. The method of claim 9, wherein the non-magnetic medical device is a device of an ancillary medical device for a nuclear magnetic resonance chamber.
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| CN105581874A (en) * | 2015-12-25 | 2016-05-18 | 福安市广源机电有限公司 | Combined type moving cart for sick and wounded |
| CN106535604A (en) * | 2016-11-28 | 2017-03-22 | 深圳市智璟科技有限公司 | Electromagnetic shielding structure used for unmanned aerial vehicle |
| CN106928673A (en) * | 2017-03-22 | 2017-07-07 | 嘉兴学院 | A kind of antibiotic carbon fiber/lactic acid composite material and its production and use |
| CN206968113U (en) * | 2017-05-26 | 2018-02-06 | 青岛烯望化学有限公司 | A kind of carbon fiber board for Medical Devices |
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