Medical Device Precision Machining

Sanluo Precision is a manufacturer and supplier of sub-micron level medical device precision machining services for medical equipment in China. The company's main business areas include providing medical device precision machining services for minimally invasive surgical instruments, implantable medical devices, and high-precision diagnostic equipment. By utilizing micro-nano level precision processing technology, it offers high-quality and distinctive customized medical device precision machining services to medical technology clients, supporting the customization of complex and difficult parts.

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Product Description

Sub-micron processing capability

Sanluo Precision's medical device precision machining can achieve precision turning with IT5 and IT4 accuracy levels. The dimensional tolerance ranges from ±0.001mm to ±0.003mm, and the surface roughness Ra is between 0.05μm and 0.2μm. The factory is equipped with ultra-precision lathes with spindle runout less than 0.5μm, nanometer-level grinding machines, and ion beam polishing equipment. A constant temperature and humidity environment (20±0.2℃) is used to eliminate the influence of thermal deformation.

dimensional accuracy	OD	ID	T（C）	DP	SH
unit:±/mm	0.002	0.003	0.005	0.005	0.002
Geometric accuracy	roundness	coaxiality	straightness	cylindricity	concentricity
unit:±/mm	0.001	0.004	0.002	0.003	0.005
production capacity	1~999999 pcs	1~999999 pcs	1~999999 pcs	1~999999 pcs	1~999999 pcs
production cycle	3-20 days	3-20 days	3-20 days	3-20 days	3-20 days

Stress-free processing technology

As a professional manufacturer of medical device precision machining, Sanluo Precision employs low-stress cutting technology. By using a combination of small cutting depth (ap < 0.05mm), high rotational speed (n > 10,000 rpm), and micro feed (f < 0.01mm/r), the cutting force and heat are reduced. After the equipment is processed, stress-relieving heat treatment (150 - 200℃, 2 - 4 hours) is carried out to eliminate residual stress and prevent size changes after implantation. Thin-walled parts (with a wall thickness less than 0.3mm) are clamped using special fixtures such as soft jaws and magnetic attraction to prevent deformation.

Surface integrity control and verification

The surface quality of medical device precision machining can affect biocompatibility. Sanluo Precision uses AFM (Atomic Force Microscope) to detect the surface morphology and ensures there are no microscopic defects. The surface roughness is measured using a white light interferometer, with an accuracy of 0.01nm. For orthopedic implants, controlling the surface roughness at Ra 1-5 μm is beneficial for bone integration, and for blood-contacting devices, controlling Ra < 0.2 μm can reduce thrombosis. Fatigue tests (with more than 10⁷ cycles), corrosion tests, and mechanical performance tests. The company has provided customized medical device precision machining services for artificial joints, spinal internal fixation, etc., supporting the customization of complex and difficult parts.

Equipment technical parameters

Parameter Categories	Parameter Details
Equipment Model	SwissNano 7
Core Positioning	Meet the processing requirements of small workpieces with extremely high precision standards
Number of Axes and Structure	6-axis motion structure, with the rear axis installed on three linear axes, is extremely simple to use
Processing Capacity	Maximum processing diameter: 7 mm (Additional 4 mm and 10 mm versions are also available)
Tool System	It can accommodate a maximum of 18 tools, among which 5 are power tools.
Special Processes	It can perform high-value-added processing, such as broaching, multi-edge turning, thread milling, and internal and external spiral milling.
Structural Features	The symmetrical cast iron structure endows the machine tool with excellent rigidity; it occupies the smallest space among similar products on the market.
Typical Applications	Medical device precision machining and processing of implant parts, watch parts and electronic parts

Jinshang S205A is a highly precise centerless turning and milling combined machine. By installing high-frequency milling attachments, it can efficiently complete the complex feature processing of the end of medical bone screws.

Parameter Categories	Parameter Details
Device Model	Tsugami S205A Thoughtful Machine (with optional high-frequency milling function)
Core Positioning	Specializing in the precision processing of small shaft-type parts such as stainless steel and titanium alloy bone screws and dental pins for the medical industry.
High-frequency Milling Accessories	An optional Japanese NAKANISHI BM-320F high-frequency mill can be installed, with a maximum rotational speed of 80,000 rpm and a runout accuracy of 1μm.
High-frequency Milling Dimensions	Outer diameter: 20mm, Length: 87mm. It can be directly installed in the tool holder hole of the Jinshang S205A for use.
Processing Function	Used for performing high-precision milling (such as internal hexagon, TORX®) on the end face of titanium alloy bone screws, with the requirement of no burrs.
Core Advantages	The walking-head machine is suitable for the continuous processing of slender shaft parts. After installing the high-frequency milling device, all processes can be completed on the same machine, ensuring consistent accuracy.
Typical Applications	Titanium alloy bone pins, bone screws, dental implants, etc.