Superior Shape Memory Special Alloys Nitinol Tube

Superior shape memory alloy, super elastic nickel titanium, Nitinol tube for biomedicine

PRODUCT

Superior shape memory alloy, super elastic nickel titanium, Nitinol tube for biomedicine.

OVERVIEW

Nitinol is a unique material. No other material exhibits the mechanical shape memory superelasticity and the thermal shape memory effects. This is especially true for Nitinol tubing. Tube surface roughness of the finished tube is one of the most critical specifications for the quality and the lifecycle of your finished device. Surface defaults of the finished stent cannot be removed by electro polishing. Cracks and deformations will remain. So an unique tube production technology that can avoid cracks and obtain a better inner surface is key important.

SPECIAL PROPERTIES OF NITINOL

1 Shape memory

2 Super elastic

3 Sensitivity to changes in oral temperature

4 Good corrosion resistance

5 Toxin immunity

6 Gentle corrective force

7 Good shock absorption characteristics

BIOMEDICINE APPLICATION

Applications of Nitinol tube for biomedicine include peripheral stents, cardio stents, catheters, superelastic needles, catheter shafts,distal protection, laproscopes, endoscopic guide tubes, orthodontic guidewires, heart valve frames and other medical devices for the human body.

CHEMICAL COMPOSITION

Table 1

The chemical composition is as per ASTM F2063-12 or GB 24627-2009(wt%)

DELIVERY CONDITION

As cold worked

Straight strain annealed

Shape set annealed

SURFACE CONDITION

Natural oxide

Pickled/etched ID/OD

Centerless ground

Mechanicall -cleaned ID

Customer specific requirements

NOMINAL DIMENSIONN AND TOLERANCE

Table 2

MECHANICAL PROPERTIES AT ROOM TEMPERATURE

Table 3

Note: The mechanical / superelastic properties are only for orientation and can be changed if necessary.

PHYSICAL PROPERTIES

Table 4

ACTIVE A_f TEMPERATURE

The austenite finish temperature of the finished tube (active Af) with outer diameter in the range of 0.3 to 3.0 mm (0.012 to 0.12 in.) shall be measured on representative full round tube sample(s) using the bend and free recovery method described in Test Method ASTM F 2082-15.

ADVANTAGE

1. First of all, all incoming Nitinol raw materials are subjected to third party inspection to ensure they meet proprietary specifications for chemistry, transformation temperature, material homogeneity, and microstructure. To promote an exceptionally smooth and uniform surface finish quality, all wire and tube products utilize a high precision single and or multi-crystalline diamond drawing die technology. After the correct super-elastic heat treatment, medical grade nickel-titanium materials can undergo up to 8% strain without permanent bending at human temperature.

2. All our Niti tubes are made according to customers specifications.

3. OD surface roughness can be up to Ra 0.1 µm(Ra).

4. ID surface roughness can be as low as Ra 0.2 µm(Ra). We have mature drawing process that avoids the need for slurry cleaning, chemical cleaning or mechanical removal operations on the inner surface of the drawn tube.

5. ID and OD surfaces can be customized, OD - Etched / centerless ground / oxide, ID – Premium ID capability for implants / etched / slurry finished / oxide / oxide free.

6. Concentricity tolerances: up to 0.01 mm.

7. Wall tolerances: as narrow as ± 0.0075 mm.

8. Material can be provided as super elastic or higher transformation temperature shape memory

9. Advantages Nitinol tube over stainless steel hypotube.

■ Kink and crush resistance

■ Flexibility

■ Large amount of recoverable deformation

■ Generation of constant or low forces over a wide range of deformation

■ Energy storage and restoration

STANDARD SPECIFICATION

ASTM F2063-12 Standard chemical composition of a wrought nitinol shape memory alloy used in medical devices and surgical implants

GB 24627 Standard chemical composition of a wrought nitinol shape memory alloy used in medical devices and surgical implants

ASTM F2633-13 Standard specification for seamless nitinol shape memory alloy fitting for medical devices and surgical implants

ASTM F2005-05 Standard terminology for nitinol shape memory alloys

ASTM F2004-05 A standard test method for the transition temperature of Nitinol alloy by thermal analysis

ASTM F2516-14 Tensile test method for nitinol hyperelastic materials

ASTM F2082-15 The standard test method for phase transition temperature of nitinolshape memory alloy by bending and free restoration.

BUSINESS TERM

NOTE:

More information available from our official web site http://www.cmmetal.cn