Views: 0 Author: Kevin Publish Time: 2026-01-12 Origin: Jinan Chensheng Medical Technology Co., Ltd.
In medical device design, "one size fits all" is a dangerous concept. A silicone tube perfect for a gravity-fed IV drip might fail catastrophically if used in a high-speed peristaltic pump.
For engineers and designers, selecting the right medical silicone tubing requires a deep understanding of the mechanical stress, fluid dynamics, and biological interaction specific to the device's function.
This guide breaks down the unique requirements of critical medical applications—from fluid management to respiratory care—and helps you match the material properties to your engineering constraints.
Peristaltic pumps are the heart of many medical devices, but they are brutal on tubing. The rollers constantly compress and release the tube, creating a high-fatigue environment.
The Engineering Challenge:
Spallation: The shedding of particles from the inner wall due to fatigue.
Flow Rate Drift: If the tube loses its shape (compression set), the dosing accuracy drops.
Selection Criteria:
Material: You need Platinum Cured Silicone specifically formulated for "Pump Grade." It has tighter cross-linking for superior resilience.
Hardness: Typically 50A to 60A Shore A. Too soft, and it collapses; too hard, and it overworks the motor.
Dimensional Tolerance: Precision is critical. A variation of just 0.1mm in wall thickness can significantly alter the flow rate.
Recommendation: For dosing pumps, explore our precision-extruded Medical Silicone Tubing designed for high cycle life.
In respiratory circuits, the tubing acts as the patient's airway. The priority here shifts from mechanical durability to airflow dynamics and hygiene.
The Engineering Challenge:
Kinking: If a tube kinks when the patient moves, airflow is cut off—a life-threatening risk.
Condensation: Warm breath creates moisture, leading to "rainout" (water accumulation) in the tube.
Selection Criteria:
Structure: Reinforced or Helix-Wire Silicone Tubing is ideal. The spiral reinforcement prevents kinking even when bent at sharp angles.
Surface Finish: A smooth inner bore is essential to maintain laminar flow and prevent bacterial biofilm accumulation.
Biocompatibility: Must be ISO 10993 compliant to ensure no volatile compounds are inhaled.
Here, the tubing is often partially implanted or in direct contact with sensitive tissue. The focus is on patient comfort and visibility.
The Engineering Challenge:
Tissue Trauma: Stiff tubing can cause pain or damage delicate tissues during insertion or removal.
Blockage: Clots or debris can obstruct drainage.
Selection Criteria:
Hardness: Choose a Low Durometer (Soft) Silicone (e.g., 30A - 50A). It mimics the texture of soft tissue, reducing irritation.
Visibility: Tubing should often include a Radiopaque Line (a strip visible under X-ray) so doctors can verify the tube's position inside the body without invasive procedures.
Surface Treatment: Hydrophilic coatings can be applied to reduce friction during insertion.
In the manufacturing of vaccines or drugs, tubing is used to transfer high-value liquids between tanks.
The Engineering Challenge:
Purity: The absolute prevention of leachables that could contaminate the drug batch.
Pressure: Transfer lines often operate under higher pressures than patient-side IVs.
Selection Criteria:
Reinforcement: Braided Silicone Tubing (reinforced with polyester mesh) allows the tube to handle higher working pressures while maintaining flexibility.
Certification: Must meet USP Class VI and stringent extractables testing.
The Problem: A manufacturer of a portable insulin pump was experiencing tubing rupture after only 48 hours of continuous use.The Diagnosis: They were using standard "General Purpose" medical tubing. The wall thickness was inconsistent, leading to uneven stress points.The Solution: We recommended switching to a custom-extruded, high-resilience medical grade silicone tubing with a tighter tolerance (±0.05mm).The Result: The pump lifespan increased to 500+ hours, significantly reducing warranty claims.
There is no "best" silicone tubing—only the best tubing for your specific application.
Need accuracy? Focus on tolerances.
Need airflow? Focus on kink resistance.
Need patient comfort? Focus on softness.
At JNGXJ, we work with engineers to customize formulations and dimensions. Visit our Medical Silicone Tubing Product Page to find the exact specification for your next medical device innovation.
Q: What is the best hardness for peristaltic pump tubing?
A: Generally, 50 Shore A to 60 Shore A is ideal. It offers the best balance between restoring force (bouncing back after compression) and motor load.
Q: Can I use braided silicone tubing for implants?
A: Typically, no. Braided tubing is designed for high-pressure fluid transfer outside the body. For implants, you need pure, unreinforced silicone that meets long-term implantation standards (ISO 10993-5).
Q: How do I prevent condensation in respiratory tubing?
A: While the material plays a role, heated wire circuits are often used inside the silicone tubing to maintain temperature and prevent condensation ("rainout").
Q: What is a radiopaque line?
A: It is a stripe (usually barium sulfate) co-extruded into the silicone tubing wall. It allows the clear tube to be seen on an X-ray or Fluoroscopy, which is critical for positioning catheters inside the body.
