Polyurethane foam simulated bone

gatherThe polyurethane foam simulated bone is produced by Sawbones Company using rigid closed cell polyurethane material, which can meet the requirements of ASTM F1839. It is an ideal material for implant biomechanical testing and simulating human bone mechanical structure.

1、 Properties of polyurethane foam

Polyurethane foam is a kind of cellular structure that can be adjusted according to density (2-60 pounds/cubic foot) and strength by reaction of isocyanate and polyol and expansion of foaming agent. It can be designed specifically to meet specific needs. At the same time, polyurethane foam can be divided into two categories: closed cell (compressive strength, dimensional stability, low water absorption, applicable to structure and insulation) and open cell (cushioning and impact resistance, applicable to comfort protection). This material combines the advantages of strength, toughness, and lightweight, with excellent tensile, compressive, impact resistance, and wear resistance. It achieves a balance between rigidity and flexibility, and its physical properties are superior to traditional materials such as ordinary thermoplastic plastics, thermosetting materials, and wood. At the same time, it avoids the defects of plastic aging and cracking, and wood deformation and decay, reducing maintenance and replacement costs.

2、 ASTM F1839 requirements

1，Polyurethane foam simulated boneComposed of polyether polyurethane.

2. The upper and lower surfaces of the simulated bone should be flat, smooth, and parallel (with a parallelism error within ± 0.4 mm) to ensure that when the simulated bone is installed in the fixture, its upper surface is at a 90 ° angle to the centerline of the specimen.

3. The simulated bone edge should have the required contour or perpendicularity to ensure that the fixture can firmly clamp the simulated bone block during clamping and testing, without relative motion, and without causing deformation of the simulated bone block.

4. If the simulated bone thickness is greater than 4.8 mm, the minimum size of the simulated bone surface should be greater than 30 times the diameter of the tested sample.

Three, SawbonesPolyurethane foam simulated boneadvantage

SawbonesPolyurethane foam simulated boneIt has the advantages of consistent batch reproducibility, stable physical properties, and simple and convenient storage,

At the same time, it can be used as a bone substitute to simulate the bone characteristics required for biomechanical testing, making it an ideal substitute for human trabecular bone and an implant testing substrate.

Secondly, by processing and regulating, the elastic modulus and compressive strength of bones can be simulated, and changing the density can simulate healthy and diseased bones,

Finally, the cell structure highly mimics human bone, meeting the skills training and orthopedic research needs of medical students. The ASTM Association has approved it as a standard material for orthopedic instrument testing.