| 摘要 |
A needle cannula with a first end and a second end wherein a section near said second end must be shaped into a coiled spring and then pulled into a biased spring needle cannula without destorting the inside surface of said spring needle cannula. A wire of suitable section is inserted into said cannula of said spring needle cannula and wherein said first end of said spring needle cannula is inserted into a hole formed in a retainer plate and wherein a portion of said spring needle cannula with said wire in said cannula is wrapped or coiled about a coil bar wherein said needle cannula is formed into a spring needle cannula and wherein the inside walls of said cannula cannot deform due to said wire disposed in said cannula. The coiled spring needle cannula with said wire inside is removed from said coil bar and further installed into a modullar hub chamber and further stretched to a suitable length wherein said stretched spring needle cannula becomes a biased spring needle cannula wherein said biased spring needle cannula is inserted into a hub chamber and wherein said biased spring needle cannula is suitably fixed to said hub chamber wherein said first end of said biased spring needle cannula extends forward froming a straight needle cannula and wherein said wire is removed from said biased spring needle cannula.
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