Polytetrafluorethylene coating material for medical apparatus surface and coating method thereof

A technology of polytetrafluoroethylene and medical equipment, which is applied to the device, coating, pretreatment surface and other directions of coating liquid on the surface, which can solve the problem that interventional catheters and guide wires are difficult to adapt to the development direction of refinement, and limit polytetrafluoroethylene. The use of vinyl coating and the complex PTFE coating system can achieve the effect of short coating film formation time, low processing cost and short production cycle.

Inactive Publication Date: 2009-01-28
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the adhesion of PTFE coating is poor, and it is generally necessary to apply a low-coating adhesive layer to improve the bonding force between the coating and the substrate. Ludis pointed out that the PTFE coating should be pre-coated with polyphenylene sulfide (PPS), poly Amidoimide (PAI) or inorganic bonding ingredients as primers to improve coating adhesion
In this way, the PTFE coating system is complex and the coating process is cumbersome, which increases the thickness of the coating, making it difficult for interventional catheters and guide wires to adapt to the development direction of refinement, which largely limits the application of PTFE coatings in the field of medical devices. usage of

Method used

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  • Polytetrafluorethylene coating material for medical apparatus surface and coating method thereof
  • Polytetrafluorethylene coating material for medical apparatus surface and coating method thereof
  • Polytetrafluorethylene coating material for medical apparatus surface and coating method thereof

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specific Embodiment approach 1

[0022] Specific embodiment one: present embodiment is a kind of preparation method of PTFE lubricating hydrophobic coating, and it comprises the following steps successively:

[0023] a. Prepare PTFE water-based paint according to the ratio of each composition in the paint shown in Table 2, and add defoamer, wetting agent, and leveling agent in sequence according to the order shown in the table; wherein, the defoamer is added in two times;

[0024] Table 2

[0025]

[0026] b. Stir the prepared PTFE water-based paint mechanically at low speed for a certain period of time, and place it for more than 24 hours for later use;

[0027] The PTFE emulsion described in this embodiment is all PTFE emulsions that can be used to prepare PTFE coatings for medical devices; the defoamers, wetting agents, and leveling agents described in this embodiment are all water-soluble.

specific Embodiment approach 2

[0028] Specific embodiment two: present embodiment is the coating method of PTFE water-based paint, and it comprises the following steps successively:

[0029] a. Immerse the medical device to be coated into the prepared PTFE water-based coating at a certain speed according to the required thickness.

[0030] b. At room temperature, the water in the water-based coating is volatilized until it is nearly dry, and then cured and sintered at a temperature range of 120-350 ° C for a certain period of time, that is, a PTFE lubricating hydrophobic coating is obtained on the surface of the medical device.

[0031] The medical devices described in this embodiment are generally medical catheters, guide wires, orthodontic wires; the coated parts are generally the surfaces of the above medical devices.

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment is the specific process parameters for coating the surface of the guide wire whose proximal push rod section is nickel-titanium (Ni-Ti) alloy, and it includes the following steps in sequence.

[0033] a. Prepare PTFE water-based paint according to the composition and proportion shown in Table 3. Its preparation process is the same as the specific embodiment one.

[0034] table 3

[0035]

[0036] b. Stir the prepared PTFE water-based paint mechanically at low speed for 2 hours, and then place it for 24 hours for later use.

[0037] c. After degreasing and degreasing the near-end pushing rod section of the Ni-Ti alloy guide wire, clean it thoroughly and dry it at room temperature.

[0038] d. Immerse the proximal pushing section of the Ni-Ti alloy guide wire into the prepared PTFE water-based paint, pull it out at a constant speed of 5cm / sec, and let it dry at room temperature.

[0039] e. Curing and sintering at a temperature of 350° ...

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Abstract

The invention provides a polytetrafluoroethylene coating material applicable to the surface of medical appliance and a coating method thereof. a. according to the mass percentage, 40-60 percent of PTFE emulsion, 0.5 percent of defoamer, 0.5 percent of wetting agent, 0.5 percent of flow agent and rest water are mixed to crank out PTFE hydrophilic paint applied to medical appliance; b. the PTFE hydrophilic paint applied to medical appliance is coated to positions needing to be coated on the medical appliance; c. under the room temperature, after water content in the PTFE hydrophilic paint waiting for being applied to the medical appliance evaporates, the paint is solidified and sintered under a temperature of 120-350 DEG C, namely, the PTFE lubricating hydrophobic coating is formed on the medical appliance. The invention has the advantages of simple paint system, short confecting and producing period, simple coating technique, and short film-forming time of the paint. The result shows that the coating of the invention not only meets the operation requirement of the medical appliance, but also is provided with simple coating technique and low manufacturing cost, and is good for popularization and application.

Description

(1) Technical field [0001] The invention relates to a polytetrafluoroethylene (PTFE) lubricating hydrophobic coating material applied to the surface of a medical device. The invention also relates to a method for applying such a coating material. (2) Background technology [0002] Biomedical materials are high-tech new materials developed in the past 30 years, which are mainly used for diagnosis, treatment or replacement of human tissues and organs or to enhance their functions. Biomedical materials are widely used, such as cardiovascular disease, cerebrovascular disease, orthodontics and so on. [0003] Organic coatings are widely used in medical catheters and guide wires in minimally invasive (or intravascular) interventional therapy techniques, orthodontic wires in orthodontic surgery. Most of the outermost coating of the catheter is made of polyethylene, which determines the shape, hardness and friction with the intima of a catheter. Most of the inner layer is PTFE coa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D127/18C09D5/02B05D7/24B05D3/00A61L29/12A61L29/08A61L31/12A61L31/10
Inventor 薛丽莉李莉方昊郑玉峰
Owner HARBIN ENG UNIV
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