| 摘要 |
A pain-alleviating device for injecting a hypodermic needle into human flesh comprising a tubular support for a syringe containing medicament and having an injection needle on one end and a plunger in the other end, the support having a canister on the end opposite that which receives the syringe and the canister comprising an annular chamber containing a solution of water and ethylene glycol or other suitable substance, such as NaCl, adapted to be frozen to as low as 0 DEG F., the needle of the syringe being disposed safely within the chamber of the canister until the syringe is projected farther into the tubular support sufficiently to project the needle through the outer end of the canister into a skin-chilled surface on a patient abutting the outer end of the canister. The assembled support and syringe being adapted to be disposed in a sub-zero chamber to chill the solution below freezing sufficiently to lower the temperature of the body area engaged by the skin-chilling surface of the canister, whereby the raising of the temperature to the 27 DEG -29 DEG F. range produces heat of fusion adequate to produce a relatively constant temperature of the foregoing range for a minimum period of three minutes within which painless injection of the needle and discharge of medicament may occur by the use of such pain-alleviating device. |
