| 摘要 |
PCT No. PCT/CH91/00234 Sec. 371 Date Oct. 22, 1993 Sec. 102(e) Date Oct. 22, 1993 PCT Filed Nov. 14, 1991 PCT Pub. No. WO93/09714 PCT Pub. Date May 27, 1993.Apparatus for withdrawing arterial blood has a protective tube having a mounting member on one end of the tube. The mounting member includes a conical seat for the receipt of a hollow needle. A connecting member is mounted on the other end of the tube. First and second capillaries, having respective ends, arc positioned within the tube. The first capillary is arranged concentrically within the second capillary so that an annular space is formed between the first and the second capillaries. The first capillary projects beyond both ends of the second capillary, and one end of each of the first and the second capillaries is mounted in the mounting member. The first capillary is connectable to a hollow-needle, and the other end of each of the first and the second capillaries is mounted in the connecting member which provides communication between the first and the second capillaries.
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