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50nml
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40
P 0 20 Distance 60 um 80 , ,, ^ , , . ,.
d
(a) Oblique view (b) Top view (c) Profile of cross section A-A ( ) Enlarged view ot
end of the object
Figure 9: Several views and measurements of machined square-shaped microchannel array
made of gold

The microchannel array is actually used for the evaluation of the blood fluidity. The cover glass is well
fitted with the chip and the blood flows smoothly. It is found that the chip is valid for the evaluation.

CONCLUSIONS

MicroChannel array chip is available for evaluation of blood fluidity. This chip is generally built on
silicon with photolithographic techniques. Therefore, the study aims at creation of metallic microchannel
array chips by means of an ultraprecision machining center and diamond cutting tools. The reason to
employ the traditional cutting technology is the high possibility of selecting various kinds of metals and
fabricating complicated shapes. The conclusions obtained in the study are summarized as follows:

(1) V-shape microchannel arrays made of gold and aluminum are well fabricated with rotational and non-
rotational cutting tools.

(2) Square-shaped microchannel array made of gold is finely created with a non-rotational cutting tool.
(3) Blood flow can be observed by use of metallic chips with the square-shaped microchannel array.

ACKNOWLEDGEMENT

This study is partly supported by the Ministry of Education, Culture, Sports, Science and Technology,
Grant-in-Aid for Scientific Research, B(2)16360069.

REFERENCES

Kumon T., Takeuchi Y., Yoshinari M., Kawai T. and Sawada K. (2002). Ultraprecision Compound V-
shaped Micro Grooving and Application to Dental Tmplants. Proc. of 3rd Int. Conf. and 4th General
Meeting ofEUSPEN 313-316.

Takeuchi Y., Maeda S., Kawai T. and Sawada K. (2002). Manufacture of Multiple-focus Micro Fresnel
Lenses by Means of Nonrotational Diamond Grooving. Annals of the CIRP 50:1, 343-346.

Takeuchi Y., Miyagawa O., Kawai T., Sawada K. and SataT. (2001). Non-adhesive Direct Bonding of
Tiny Parts by Means of Ultraprecision Trapezoid Microgrooves. J. of Microsystem Technologies 7:1,
6-10.