| CPC A61M 5/3202 (2013.01) [A61M 5/346 (2013.01); A61M 5/348 (2013.01); A61M 2005/3104 (2013.01)] | 7 Claims |
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1. A safe insulin needle assembly comprising a protection sheath, a needle, a safety protection sleeve, a pressure seat and a needle holder, the needle is arranged on the central axis of the needle holder, the pressure seat is sheathed over the upper portion of the needle holder; the safety protection sleeve is sheathed on the needle holder and the pressure seat as a whole; the upper portion of the safety protection sleeve is connected to and cooperates with the pressure seat; the needle protrudes out of the top end of the upper portion of the safety protection sleeve; the lower portion of the safety protection sleeve is connected to and cooperates with the lower portion of the needle holder; the protection sheath is sheathed on the safety protection sleeve and the needle as a whole; and the lower portion of the protection sheath is connected to and cooperates with the lower portion of the safety protection sleeve;
the protection sheath having a hollow cavity; an upper portion in the form of a hollow truncated cone; the lower portion in the form of a cylinder, the diameter of the lower portion is larger than that of the lower edge of the upper portion of the protection sheath; a first location step in an annular form, provided at the connection between the upper portion and the lower portion of the protection sheath; a top end in a closed form on the upper portion of the protection sheath; an inner wall on the lower portion of the protection sheath, provided thereon with at least two first inner circular vertical bars uniformly distributed along the circumference, oriented in the axial direction;
the safety protection sleeve having a hollow cavity; the upper portion and the lower portion each in the form of a cylinder; a top end on the upper portion, provided thereon with a needle penetration hole, the diameter of the upper portion being smaller than that of the lower portion; a second location step, in an annular form, provided at the connection between the upper portion and the lower portion; the first location step cooperating with the second location step in the manner of axial position limiting; the outer wall on the lower portion of the safety protection sleeve provided thereon with a circular outer location protrusion boss along the lower edge of the outer wall, with at least two outer location bars uniformly distributed along the circumference, oriented in the axial direction and having a lower end which is linked to the outer location protrusion boss; a free position surface provided between the outer location bars, used for the insertion of the first inner circular vertical bar and interference fit therebetween;
an inner wall on the upper portion of the safety protection sleeve, provided thereon with at least two second inner circular vertical bars uniformly distributed along the circumference and at least one first location vertical bar, each oriented in the axial direction; the first location vertical bar provided thereon with a protrusion point, having a lower end provided thereon with a position-limiting protrusion protruded to each side; the inner wall of the upper portion of the safety protection sleeve provided thereon with a circular inner position-limiting protrusion boss along the lower edge of the inner wall; an inner wall on the lower portion of the safety protection sleeve provided thereon with at least two third inner circular vertical bars uniformly distributed along the circumference and at least one second location vertical bar, each oriented in the axial direction; a lower end on the second location vertical bar and being provided thereon with a position-limiting step protrusion deflected to one side;
the pressure seat being in a cylinder form, having an outer wall provided on the upper edge thereof with at least two position-limiting protrusion bosses uniformly distributed along the circumference, the position-limiting protrusion boss having an outer side snugly fitting the inner wall of the upper portion of the safety protection sleeve, the position-limiting protrusion boss cooperating with the inner position-limiting protrusion boss of the safety protection sleeve in a manner of axial position limiting, a position-limiting opening provided between two adjacent position-limiting protrusion bosses, used for upward penetration of the second inner circular vertical bar and first location vertical bar of the safety protection sleeve; the position-limiting protrusion bosses each having a upper surface provided thereon with a position-limiting block, the part between two adjacent position-limiting blocks constituting an anti-reversal tooth groove, the position-limiting block and the anti-reversal tooth groove cooperating with the position-limiting protrusion on the lower portion of the first location vertical bar of the safety protection sleeve; the outer wall of the pressure seat provided thereon with at least two outer guidance flanges uniformly distributed along the circumference, corresponding to the position limiting protrusion bosses respectively, oriented in the axial direction and cooperating with the second inner circular vertical bar and the first location vertical bar of the safety protection sleeve; the outer guidance flange having an upper end, between the upper ends on two adjacent outer guidance flanges being provided thereon with protrusion flange along the circumference, interference fitting the protrusion point on the first location vertical bar of the safety protection sleeve; the inner wall of the pressure seat having a middle portion which is provided thereon with at least two clutch protrusions uniformly distributed along the circumference, the inner wall of the pressure seat having a lower portion which is provided thereon with at least two inner guidance flanges uniformly distributed along the circumference, oriented in the axial direction; the needle holder having the upper portion in a tube form, an outer wall on the upper portion provided thereon with at least two guidance fastening flanges uniformly distributed along the circumference, oriented in the axial direction and cooperating with the inner guidance flange of the pressure seat, the guidance fastening flange provided thereon with a clutch opening cooperating with the clutch protrusion of the pressure seat;
the needle holder having the lower portion in a cylindrical form, the lower portion having an upper end face cooperating with the second location step of the safety protection sleeve in a manner of axial position limiting, the lower portion of the needle holder having an outer wall provided thereon with at least two position-limiting vertical bars and at least one position-limiting bar uniformly distributed along the circumference, each oriented in the axial direction and cooperating with the third inner circular vertical bar and second location vertical bar of the safety protection sleeve, the position-limiting bar having a lower end cooperating with the position-limiting step protrusion on one side of the lower end of the second location vertical bar of the safety protection sleeve; the lower portion on the needle holder having an inner cavity which is provided thereon with a radial platform having an upper side linked to the upper portion of the needle holder, the radial platform cooperating with the inner position-limiting protrusion boss of the safety protection sleeve and the lower end face of the pressure seat in a manner of axial position limiting, the inner wall on the lower portion of the needle holder having a part corresponding to the lower portion of the radial platform, which is provided with internal thread.
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