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Safety syringe cylinder

  • US 6,929,622 B2
  • Filed: 07/15/2002
  • Issued: 08/16/2005
  • Est. Priority Date: 07/15/2002
  • Status: Expired due to Fees
First Claim
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1. A safety syringe cylinder comprising a syringe cylinder, a syringe needle, a push rod;

  • whereinan upper end of the syringe cylinder has a syringe connecting seat; and

    a center of the syringe connecting seat has a positioning groove;

    an upper end of the syringe needle is a needle tube and a lower end thereof is a needle;

    a lower end of the needle has a hook seat;

    two wedge rings are arranged around the needle;

    a center of the hook seat is a channel hole;

    the channel hole penetrates through the needle so as to communicate with the needle tube;

    a top of the push rod has a push rod body which is formed with a connecting block;

    the connecting block is inserted into the combining hole of a push rod cap;

    the push rod cap is made of elastic material;

    a periphery of the push rod cap has a positioning groove;

    a top center of the push rod cap has an annular hook groove;

    the hook groove has two stepped enlarged holes;

    thereby, the syringe needle is combined with the positioning hole of the syringe connecting meat of the syringe cylinder; and

    push rod is inserted into the cylinder body of the syringe cylinder;

    wherein an inner upper end of the syringe cylinder is installed with an annular ring;

    the annular ring is embedded into the hook groove on the top surface of the push rod cap when the push rod moves upwards to a top end of the syringe cylinder so as to prevent the injection liquid remained in the hook groove.

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