Shielding apparatus for lower end of injection needle and injection device
The present disclosure provides a shielding apparatus for a lower end of an injection needle and an injection device, and relates to the technical field of injection instruments. By using the shielding apparatus for a lower end of an injection needle in the present disclosure, in the process of mounting a needle holder on an insulin pen, and when the injection needle is completely removed from the insulin pen, the limit block also moves downwardly to abut against a bottom wall of the moving groove, and the shielding cylinder completely covers the lower end of the injection needle, so as to avoid a situation that a user accidentally touches the lower end of an injection needle to be injured, thereby avoiding the safety risk when the lower end of the injection needle is removed.
1 . A shielding apparatus for a lower end of an injection needle, comprising:
a needle holder ( 1 ), used for mounting of an injection needle ( 2 ) of an injection device and mounted on an insulin pen of the injection device, wherein the needle holder ( 1 ) is provided with a moving groove ( 11 ), a limit groove ( 12 ) and a first guiding bevel ( 13 ) on an inner wall, the moving groove ( 11 ) extending along an axial direction of the needle holder ( 1 ), the limit groove ( 12 ) being located on a side of an upper end of the moving groove ( 11 ) and being communicated with the moving groove ( 11 ) through the first guiding bevel ( 13 ), and an end of the first guiding bevel ( 13 ) connected to the limit groove ( 12 ) being higher than an end of the first guiding bevel ( 13 ) connected to the moving groove ( 11 ); and
a shielding cylinder ( 3 ), mounted in the needle holder ( 1 ) and allowing the injection needle ( 2 ) to penetrate through, wherein a limit block ( 31 ) for placing in the limit groove ( 12 ) is provided on a side wall of the shielding cylinder ( 3 ), the limit block ( 31 ) being located below the first guiding bevel ( 13 ); when the needle holder ( 1 ) is mounted on the insulin pen, the shielding cylinder ( 3 ) abuts against the insulin pen and moves upwardly to allow the limit block ( 31 ) in the limit groove ( 12 ) to enter the moving groove ( 11 ) along the first guiding bevel ( 13 ); and after the needle holder ( 1 ) is separated from the insulin pen, the limit block ( 31 ) moves downwardly along the moving groove ( 11 ) to allow the shielding cylinder ( 3 ) to cover and shield the lower end of the injection needle ( 2 ).
2 . The shielding apparatus for a lower end of an injection needle of claim 1 , wherein the needle holder ( 1 ) is of a hollow structure with an opening at a lower end, the shielding cylinder ( 3 ) is slidably mounted in the needle holder ( 1 ) through an open end of the needle holder ( 1 ), a spring ( 4 ) is provided between an inner top wall of the needle holder ( 1 ) and the shielding cylinder ( 3 ), and the spring ( 4 ) is in a compressed state when the limit block ( 31 ) is located in the limit groove ( 12 ).
3 . The shielding apparatus for a lower end of an injection needle of claim 2 , wherein the shielding cylinder ( 3 ) is provided with a boss ( 32 ) on the side wall, and the boss ( 32 ) is provided with a second guiding bevel ( 321 ) on an upper end face; the needle holder ( 1 ) is provided with a downwardly opening placement groove ( 14 ) at an edge of the open end, and the placement groove ( 14 ) is provided with a third guiding bevel ( 141 ) on an inner top wall; the second guiding bevel ( 321 ), the third guiding bevel ( 141 ) and the first guiding bevel ( 13 ) all extend along the circumference of the needle holder ( 1 ) in a same inclination direction and at a same inclination angle; when the limit block ( 31 ) is located in the limit groove ( 12 ), the boss ( 32 ) is located below the needle holder ( 1 ), and after the limit block ( 31 ) enters the moving groove ( 11 ) from the limit groove ( 12 ), the boss ( 32 ) is placed in the placement groove ( 14 ), and the second guiding bevel ( 321 ) and the third guiding bevel ( 141 ) fit against each other.
4 . The shielding apparatus for a lower end of an injection needle of claim 2 , wherein the limit block ( 31 ) is provided with a fourth guiding bevel ( 311 ) on a side away from the moving groove ( 11 ), a fifth guiding bevel ( 111 ) is provided at a connecting portion between the moving groove ( 11 ) and the limit groove ( 12 ), a lower end of the fifth guiding bevel ( 111 ) is closer to the moving groove ( 11 ) as compared with an upper end, the fourth guiding bevel ( 311 ) is parallel to the fifth guiding bevel ( 111 ), and when the limit block ( 31 ) moves downwardly along the moving groove ( 11 ) and passes through the connecting portion between the moving groove ( 11 ) and the limit groove ( 12 ), the fourth guiding bevel ( 311 ) is used for abutting against the fifth guiding bevel ( 111 ).
5 . The shielding apparatus for a lower end of an injection needle of claim 4 , wherein a transition groove ( 15 ) extending along the axial direction is further provided on the inner wall of the needle holder ( 1 ), the transition groove ( 15 ) is located above the moving groove ( 11 ) and is connected to the moving groove ( 11 ), and after the needle holder ( 1 ) is mounted on the insulin pen, the limit block ( 31 ) is located in the transition groove ( 15 ).
6 . The shielding apparatus for a lower end of the injection needle of claim 2 , wherein the needle holder ( 1 ) is further provided with an accommodating groove ( 17 ) on the inner wall, a middle section of the moving groove ( 11 ) is connected to the accommodating groove ( 17 ), an elastic rod ( 171 ) is provided between the moving groove ( 11 ) and the accommodating groove ( 17 ), and the elastic rod ( 171 ) is inclined towards the moving groove ( 11 ) and is used to oscillate back and forth between the moving groove ( 11 ) and the accommodating groove ( 17 ).
7 . The shielding apparatus for a lower end of an injection needle of claim 6 , wherein a lower end of the elastic rod ( 171 ) is arranged to be inclined towards the moving groove ( 11 ), and a distance between the lower end of the elastic rod ( 171 ) and a side wall of the moving groove ( 11 ) away from the accommodating groove ( 17 ) is less than the width of the limit block ( 31 ).
8 . The shielding apparatus for a lower end of an injection needle of any one of claims 2 to 7 , wherein a mounting post ( 16 ) is provided in the needle holder ( 1 ), the mounting post ( 16 ) is disposed on an inner top wall of the needle holder ( 1 ), the spring ( 4 ) and the shielding cylinder ( 3 ) are both sleeved on the mounting post ( 16 ), and the mounting post ( 16 ) is used for mounting the injection needle ( 2 ) throughout.
9 . The shielding apparatus for a lower end of an injection needle of any one of claims 2 to 7 , further comprising a connecting seat ( 5 ), which is of a hollow structure with openings at both an upper end and a lower end, wherein the needle holder ( 1 ) and the connecting seat ( 5 ) are connected up and down, a lower end of the shielding cylinder ( 3 ) is located in the connecting seat ( 5 ), the connecting seat ( 5 ) is provided with threads on an inner wall, and the connecting seat ( 5 ) is used for connecting with the insulin pen through the threads, such that the insulin pen abuts against the shielding cylinder ( 3 ) and drives the shielding cylinder ( 3 ) to move upwardly.
10 . An injection device, comprising an injection needle ( 2 ), an insulin pen, and the shielding apparatus for a lower end of an injection needle of claim 1 .