Tip protection device

一种防护套，用于将管道尖头安全可靠地锁在防护套内的内室中，以保护医务人员免受扎伤。该护套包括一个具有内室的细长主体和一个沿主体的整个长度穿过内室延伸并且管道可滑动地从中穿过而被接收的轴向通孔。内室中具有移动部件，每一个移动部件包括一个用于接收从中穿过的管道的孔，并且根据管道尖头的缩回进行位移，借此阻止管道尖头的再次推进。在实施例中，移动部件是圆环、具有通孔的刚性球或一对锥形部件，其中锥形部件之一被弹簧偏移，并且每一锥形部件包括一偏置孔。在每一实施例中，较为可取的是，管道在尖头附近包括一个加厚部分，并且防护套在其后部相应地包括一个圆突缘。穿过后部延伸的通孔的直径小于管道的加厚部分的直径，由此管道尖头不能从防护套中缩回。 A safety cover (20) which securably and reliably locks the tip (116) of a cannula (18) in an interior chamber (104) within the safety cover. The cover comprises an elongate body (101) having the interior chamber and an axial through hole (100) which extends along the entire length of the body, through the interior chamber and through which the cannula is slidably received. Displacing elements (108,110) are positioned within the interior chamber, each of which includes a hole (112) for receiving said cannula therethrough, and which displaces upon retraction of the tip of said cannula, thereby preventing subsequent advancement of said cannula tip. In a first embodiment the displacing elements are annular rings (108,110). In a second embodiment, the elements are rigid balls (120,122) having through holes (124,126). In a third embodiment, the displacing elements are a pair of conical elements (210,212), one of which is spring biased, each of which includes an offset hole (214,216). In each embodiment, it is preferable that the cannula should include a thickened rib (116) adjacent to said tip, and the safety cover should correspondingly include an annular section (14) in the rear portion thereof. The through hole extending through the rear portion has a diameter which is smaller than said thickened rib of said cannula whereby the cannula tip may not be retracted from the safety cover.