Technical Scheme of Ultrasonic Guide Wire Coating System

Technical Scheme of Ultrasonic Guide Wire Coating System – Cheersonic

This technical solution is designed for the preparation of functional coatings on the surface of micro medical devices, and a precision spraying system based on ultrasonic atomization technology is developed. The system achieves uniform and controllable deposition of coatings on the surface of fine cylindrical substrates by integrating ultrasonic atomization devices, multi axis motion control platforms, constant temperature liquid supply systems, and real-time monitoring modules. Specially suitable for precision coating of functional polymer materials on the surface of slender guide wire workpieces with a diameter of 0.3mm and a length of 600mm, it can meet the high standard requirements for coating uniformity, consistency, and repeatability in the medical device field.

System composition and working principle

1. Ultrasonic atomization core module
– Using a high-frequency ultrasonic oscillator (operating frequency 1.6-2.4MHz) to convert the spray solution into micrometer sized atomized particles
– The distribution range of atomized particles is controlled within 10-50 μ m to ensure the uniformity and density of the coating surface
– Equipped with amplitude adjustment function (15% -100% adjustable) to meet the atomization needs of solutions with different viscosities

2. Multi axis precision motion system
– Adopting a three-axis linkage mechanical structure: X-axis (horizontal movement), Z-axis (vertical positioning), and R-axis (rotation control)
– The rotating shaft is equipped with a precision clamping device, which supports stable clamping and uniform rotation of 0.3mm diameter guide wires
– Motion accuracy: Linear positioning accuracy ± 0.1mm, rotation speed 0-300rpm infinitely adjustable

3. Constant temperature liquid supply system
– Liquid storage unit with built-in temperature control device, temperature control range 20-60 ℃± 1 ℃
– Adopting a micro metering pump, the flow range can be accurately adjusted from 0.1-10mL/min
– Equipped with solution circulation and filtration devices to ensure the stability of the spraying process

4. Environmental control system
– Sealed spraying chamber with built-in temperature and humidity sensors and exhaust devices
– Can maintain a stable environment with a temperature of 25 ± 2 ℃ and a relative humidity of 45 ± 5% inside the chamber
– Equipped with a solvent recovery device that meets environmental and safety requirements

Optimization of process parameters

Based on a guide wire substrate with a diameter of 0.3mm and a length of 600mm, as well as a PCL-PEG-PCL ternary block copolymer coating material, the optimal process parameter combination has been determined through systematic experimental verification

1. Atomization parameters
– Ultrasonic frequency: 2.0MHz
– Atomization rate: 2.5mL/min
– Atomization distance: 50mm

2. Sports parameters
– Guide wire rotation speed: 120rpm
– Nozzle movement speed: 8mm/s
– The coating thickness is precisely controlled by the number of reciprocating spraying cycles

3. Environmental parameters
– Working temperature: 25 ℃
– Solution temperature: 35 ℃
– Relative humidity: 45%

Coating performance characteristics

The PCL-PEG-PCL coating prepared using this system has the following excellent characteristics:

1. Structural integrity
– The coating is continuous and intact, without dripping or orange peel phenomenon
– Surface roughness Ra ≤ 0.5 μ m
– Coating thickness uniformity deviation ≤± 5%

2. Material characteristics
– PCL segments provide good mechanical strength and degradation controllability
– PEG segments endow coatings with excellent hydrophilicity and anti protein adsorption properties
– Block structure achieves precise control of degradation rate and drug release

3. Functional performance
– The adhesion between the coating and the substrate is ≥ 5B (cross cut test)
– The degradation cycle in PBS solution can be adjusted to 4-12 weeks
– Surface contact angle of 65 °± 3 °, with moderate hydrophilicity

Quality Control System

1. Process monitoring
– Real time monitoring of atomization status, motion parameters, and environmental conditions
– Equipped with CCD vision system, online detection of coating surface quality
– The data collection system records all process parameters to achieve full traceability throughout the entire process

2. Testing standards
– Measure the coating thickness for each batch using the three-point measurement method
– Regularly conduct coating adhesion tests
– Sampling for in vitro degradation experiments and biocompatibility evaluation

3. Process validation
– Determine key process parameters using the Quality of Design (QbD) method
– Establish design space through Design of Experiments (DOE)
– Complete process validation batch (3 batches) testing, RSD≤3%

Application Expansion and Advantages

This system is not only suitable for the preparation of guide wire coatings, but can also be extended to the surface treatment of other micro medical devices:
– Functional coating on the surface of vascular intervention catheter
– Neural stimulation electrode insulation coating
– Wear resistant coating for minimally invasive surgical instruments

The core advantages of the system are reflected in:
1. Solve the problems of uneven coating thickness and edge effects in traditional immersion coating methods
2. Overcome the defects of atomized particle splashing and low material utilization caused by spraying method
3. Realize controllable deposition of submicron level coating accuracy
4. Suitable for coating requirements of various functional polymer materials

Technological development trends

With the rapid development of precision medicine and personalized medical devices, ultrasonic precision spraying technology will evolve in the following directions:
1. Integrate with 3D printing technology to achieve surface functionalization of complex structural devices
2. Develop a multi material co spraying system to achieve gradient functional coating preparation
3. Introduce artificial intelligence algorithms to achieve intelligent optimization and real-time control of process parameters
4. Combining microfluidic technology to achieve precise preparation of ultra-thin coatings (≤ 1 μ m)

This ultrasonic guide wire precision spraying system provides a complete solution for surface functionalization treatment of micro medical devices through innovative technological design and strict process control, with good application prospects and technological scalability.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

Chinese Website: Cheersonic Provides Professional Coating Solutions