Blood sampling pen

Abstract

The blood sampling pen comprises a pen shell, a needle shooting piece arranged in the pen shell and a limiting piece arranged on the inner wall of the pen shell, the needle shooting piece has the first state that movement is limited by the limiting piece and the second state that the needle shooting piece is separated from the limiting piece, a blood sampling needle is arranged at the bottom end of the needle shooting piece, and the blood sampling pen further comprises a pen cap for driving the blood sampling needle to be separated from the needle shooting piece and a needle withdrawing rod. The first blocking piece and the second blocking piece are used for limiting movement of the pen cap and the needle withdrawing rod when the needle shooting piece is in the first state, the first blocking piece is arranged on the inner wall of the pen shell, and the second blocking piece is arranged on the outer wall of the needle shooting piece. When the needle shooting piece is in the first state, the pen cap and the needle withdrawing rod are limited by the first blocking piece and the second blocking piece and cannot move, then the blood taking needle and the needle shooting piece cannot be driven to be separated, and when the needle shooting piece is in the second state, the needle withdrawing rod can be used for driving the blood taking pen and the needle shooting piece to be separated.

Description

Technical Field

[0001] This application relates to the technical field of blood collection pens, and particularly to a blood collection pen. Background Art

[0002] Blood collection is a process in which medical staff collect blood samples from veins or arteries due to inspection or related needs. In some blood collection processes, a blood collection pen and a matching blood collection needle are required to puncture the fingertip or arm of a patient for blood collection. Commonly available blood collection pens on the market usually insert the blood collection needle into the blood collection pen, and then pull the pen cap connected to the spring and provided at the tail end of the blood collection pen, so that the blood collection needle and the blood collection needle holder are restricted and cannot move, and the spring is compressed. Pressing the button releases the restriction on the blood collection needle holder, and the blood collection needle and the blood collection needle holder are ejected and extended under the action of the spring in the pen, so as to achieve the purpose of puncturing the fingertip or arm of the patient.

[0003] In the existing blood collection pen, the blood collection needle can be withdrawn by pressing the pen cap. However, before pressing the button, that is, when the blood collection needle and the blood collection needle holder are restricted and cannot move, it is easy to operate incorrectly and cause the blood collection needle to be withdrawn. After the needle cap of the blood collection needle is removed, it is not convenient to install it again, and it is also easy to cause the situation that the blood collection needle cannot be used continuously after being contaminated. Utility Model Content

[0004] In view of the above defects or deficiencies in the prior art, this application aims to provide a blood collection pen, including:

[0005] A pen shell, having a first space inside, and the extending direction of the first space is the first direction;

[0006] A needle shooting member, provided in the first space and movable along the first direction. A blood collection needle is provided at the bottom end of the needle shooting member. A limiting member is provided on the inner wall of the pen shell. The needle shooting member has a first state and a second state. When in the first state, the limiting member contacts the needle shooting member, and the limiting member restricts the needle shooting member from moving along the first direction towards the blood collection needle side. When in the second state, the limiting member is separated from the needle shooting member, and the needle shooting member can move along the first direction towards any side;

[0007] A needle withdrawing assembly, including a pen cap provided at the end of the pen shell away from the blood collection needle, and a needle withdrawing rod provided on the inner top wall of the pen cap. One end of the needle withdrawing rod is connected to the inner top wall of the pen cap, and the other end penetrates through the needle shooting member and abuts against the blood collection needle. The pen cap and the needle withdrawing rod can move along the first direction towards the blood collection needle side to drive the blood collection needle to be separated from the needle shooting member;

[0008] A second blocking member is provided on the outer wall of the injection needle member, and a first component is provided on the pen cap. When the injection needle member is in the first state, the second blocking member abuts against the first component, restricting the pen cap and the needle retracting rod from moving toward the blood collection needle side.

[0009] According to the technical solution provided by the embodiment of the present application, the first component includes:

[0010] A first blocking member, which is provided on the inner wall of the pen case away from the blood collection needle;

[0011] Two first mating members, which are provided at the end of the pen cap close to the blood collection needle, and the two first mating members are located on both sides of the first blocking member along the second direction;

[0012] Each of the first mating members includes: two first connecting rods distributed along the third direction, and a first connecting block is fixedly connected between the two first connecting rods;

[0013] When the injection needle member is in the first state, the second blocking member abuts against the first connecting block, restricting the pen cap and the needle retracting rod from moving toward the blood collection needle side;

[0014] When the injection needle member is in the second state, the pen cap and the needle retracting rod can move along the first direction toward the blood collection needle side.

[0015] According to the technical solution provided by the embodiment of the present application, a shifting component is provided on the pen cap, and the shifting component is used to switch the injection needle member from the second state back to the first state.

[0016] According to the technical solution provided by the embodiment of the present application, a limiting component is provided in the pen case, and the limiting component is used to restrict the injection needle member from rotating around the axis of the first space.

[0017] According to the technical solution provided by the embodiment of the present application, the limiting component includes a hollow cylinder, the hollow cylinder is sleeved on the outer wall of the injection needle member and is fixedly connected to the inner wall of the pen case, a first limiting groove is provided on the side wall of the hollow cylinder, the extending direction of the first limiting groove is the first direction, the second blocking member is slidably arranged in the first limiting groove, and the two side walls of the first limiting groove along the second direction are respectively in contact with the side wall of the second blocking member.

[0018] According to the technical solution provided by the embodiment of the present application, an elastic member is included on the injection needle member. The limiting member includes a blocking protrusion provided on the inner wall of the pen case and extending toward the axis side of the first space. A button is provided on the side wall of the pen case. The button has a transmitting end, and the transmitting end can move toward the axis side of the first space to drive the elastic member to move toward the axis side of the first space and separate from the blocking protrusion, so that the limiting member is separated from the injection needle member.

[0019] According to the technical solution provided by the embodiment of the present application, a launch spring is sleeved outside the injection needle member. One end of the launch spring abuts against the inner wall of the top of the hollow cylinder, and the other end abuts against the second blocking member.

[0020] According to the technical solution provided by the embodiment of the present application, a second extension block is provided on the pen cap. The second extension block is formed by extending from the end of the pen cap close to the blood collection needle side toward the hollow cylinder side;

[0021] The shifting assembly includes a first matching structure provided between the pen cap and the hollow cylinder. The first matching structure has a connection end on the side away from the blood collection needle, and the connection end is connected to the pen cap; a first clamping groove is provided on the connection end, and a return spring is sleeved outside the first matching structure; the return spring is in a state of storing energy, and one end of the return spring abuts against the second extension block, and the other end abuts against the connection end.

[0022] According to the technical solution provided by the embodiment of the present application, the first connection block is provided between the middle parts of the two first connecting rods; the first matching structure is a first vertical rod provided on the top of the hollow cylinder and on the outside of the injection needle member away from the blood collection needle end, and the extending direction of the first vertical rod is the first direction;

[0023] The shifting assembly further includes:

[0024] A third blocking member, which is provided on the injection needle member;

[0025] A second connection block, which is provided between the bottoms of the two first connecting rods. The third blocking member is located between the two first matching members and slides between the first connection block and the second connection block.

[0026] According to the technical solution provided by the embodiment of the present application, the first matching structure is a first extension portion formed by extending from the injection needle member away from the blood collection needle end toward the inner side wall of the pen cap.

[0027] In summary, the present application provides a blood collection pen, which includes a pen housing, a needle shooting member disposed inside the pen housing, and a limiting member disposed on the inner wall of the pen housing. The needle shooting member has a first state in which its movement is restricted by the limiting member and a second state in which it is separated from the limiting member. A blood collection needle is provided at the bottom end of the needle shooting member. The blood collection pen further includes a pen cap and a needle retracting rod for driving the separation of the blood collection needle and the needle shooting member, and a first blocking member and a second blocking member for restricting the movement of the pen cap and the needle retracting rod when the needle shooting member is in the first state. The first blocking member is disposed on the inner wall of the pen housing, and the second blocking member is disposed on the outer wall of the needle shooting member. When in use, when the needle shooting member is in the first state, the blood collection needle cannot be ejected and extended along with the needle shooting member. At this time, both the pen cap and the needle retracting rod are restricted by the first blocking member and the second blocking member and cannot move, and thus cannot drive the separation of the blood collection needle and the needle shooting member. When the needle shooting member is in the second state, the needle retracting rod can be used to drive the separation of the blood collection pen and the needle shooting member, effectively solving the problem in the prior art that when the blood collection needle and the bracket are restricted and cannot move, it is easy to operate incorrectly and cause the blood collection needle to retract, with stronger safety and better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of a blood collection pen provided by an embodiment of the present application;

[0029] Figure 2 is Figure 1 a schematic structural diagram of the cross-section H-H in ;

[0030] Figure 3 is Figure 1 a partially enlarged schematic structural diagram of area A in ;

[0031] Figure 4 is a schematic structural diagram of the pen housing and the hollow cylinder in a blood collection pen provided by an embodiment of the present application;

[0032] Figure 5 is a schematic structural diagram of the pen housing and the pen tip in a blood collection pen provided by an embodiment of the present application;

[0033] Figure 6 is a schematic structural diagram of the pen cap in a blood collection pen provided by an embodiment of the present application;

[0034] Figure 7 is a schematic structural diagram of the needle shooting member in a blood collection pen provided by an embodiment of the present application;

[0035] Figure 8 is a schematic structural diagram of the needle fixing seat in a blood collection pen provided by an embodiment of the present application;

[0036] Figure 9 is a schematic structural diagram of the blood collection needle in a blood collection pen provided by an embodiment of the present application;

[0037] Figure 10Schematic diagram of the structure of the first extension part provided by the embodiment of the present application;

[0038] Figure 11 Provided by the embodiment of the present application Figure 10 Schematic diagram of the front-back direction cross-section structure in

[0039] Figure 12 Schematic diagram of the structure of the second extension part provided by the embodiment of the present application.

[0040] The text markings in the figure are shown as:

[0041] 1. Pen shell; 11. Hollow cylinder; 12. First limiting groove; 13. Second limiting groove; 14. First vertical rod; 15. First extension block; 16. First blocking member; 17. First ring body; 18. Second ring body; 19. Separation groove; 110. Elastic plate; 111. Clamping block; 112. Third connecting block; 113. Button; 114. Blocking protrusion; 115. Transparent member;

[0042] 2. Needle injection member; 21. Second blocking member; 22. Third blocking member; 23. Needle fixing seat; 24. Limiting block; 25. Elastic member; 26. Limiting groove; 27. Third extension block; 28. Prompt area; 29. Fourth extension block; 201. First extension part; 202. Connection end; 203. First clamping groove; 204. Second extension part;

[0043] 3. Pen cap; 31. Needle retracting rod; 32. First fitting member; 33. First connecting block; 34. Second connecting block; 35. Second vertical rod; 36. Second extension block; 37. Third limiting groove;

[0044] 4. Blood collection needle; 41. Needle body; 42. Needle sleeve; 43. Needle cap; 44. Groove;

[0045] 51. Launching spring; 52. Reset spring; 53. Contracting spring;

[0046] 6. Pen tip; 61. First limiting strip; 62. Second limiting strip; 63. Clamping groove; 64. Third ring body; 65. Step-shaped supporting surface.

[0047] 231. Sleeve; 232. Circular ring plate; 233. Arc-shaped plate; 234. First protrusion; 235. Limiting block; 236. Rib plate. Detailed implementation manners

[0048] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than limiting the utility model. In addition, it should be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings.

[0049] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0050] As mentioned in the background art, in view of the problems in the prior art, the present application provides a blood collection pen, including:

[0051] A pen casing 1, having a first space therein, the extending direction of the first space being a first direction, wherein the first direction is Figure 1 the vertical direction in

[0052] A needle shooting member 2, disposed in the first space and movable along the first direction, a blood collection needle 4 is provided at the bottom end of the needle shooting member 2, a limiting member is provided on the inner wall of the pen casing 1, the needle shooting member 2 has a first state and a second state, when in the first state, the limiting member contacts the needle shooting member 2, and the limiting member restricts the needle shooting member 2 from moving along the first direction towards the side of the blood collection needle 4, when in the second state, the limiting member is separated from the needle shooting member 2, and the needle shooting member 2 can move along the first direction towards any side;

[0053] Wherein, the first state is called the engaged state in the use scenario, and the second state is called the disengaged state;

[0054] As Figure 9 shown, a common blood collection needle 4 is provided, the blood collection needle 4 includes an integrally formed needle sleeve 42 and a needle cap 43, the needle body 41 is placed in the needle sleeve 42, rotating the needle cap 43 can separate it from the needle sleeve 42, the needle body 41 is exposed, and a groove 44 is provided at the end away from the needle cap 43, the groove 44 is used for the installation of the blood collection needle 4, the needle shooting member 2 is connected to the blood collection needle 4 through a needle fixing seat 23, as Figure 7 and Figure 8 shown, the needle fixing seat 23 includes a connecting sleeve 231 connected to the needle shooting member 2, a circular ring plate 232 is formed by the outer wall of the bottom of the sleeve 231 extending towards the inner wall side of the pen casing 1, two symmetric arc-shaped plates 233 are provided on the top wall inside the sleeve 231, first protrusions 234 are provided at the bottoms of the two arc-shaped plates 233, and the first protrusions 234 are snapped into the groove 44 to complete preliminary fixation. Also, since the projection of the needle sleeve 42 in the first direction is cross-shaped, two symmetric limiting blocks 235 are provided on the top of one arc-shaped plate 233, and the four limiting blocks 235 are respectively placed at the four corners of the cross-shaped needle sleeve 42 to restrict the rotation of the needle sleeve 42.

[0055] In a preferred embodiment, the injection needle member 2 includes an elastic member 25. The limiting member includes a blocking protrusion 114 provided on the inner wall of the pen housing 1 and extending toward the axis side of the first space. A button 113 is provided on the side wall of the pen housing 1. The button 113 has a transmitting end, and the transmitting end can move toward the first axis side to drive the elastic member 25 to move toward the axis side of the first space and separate from the blocking protrusion 114, so that the limiting member is separated from the injection needle member 2.

[0056] As Figure 1 and Figure 2 As shown, a limiting groove 26 is provided at the bottom end of the elastic member 25. When the injection needle member 2 is in the first state, that is, in the "engaged" state, the side wall of the bottom end of the elastic member 25 abuts against the transmitting end of the button 113 on the inner wall of the pen housing 1, and the limiting groove 26 abuts against the blocking protrusion 114. The end of the elastic member 25 away from the limiting groove 26 is connected to the injection needle member 2. Therefore, the blocking protrusion 114 hinders the elastic member 25 and the injection needle member 2 connected thereto from moving along the first direction toward the blood collection needle 4 side. When the transmitting end of the button 113 is pressed, the transmitting end squeezes the bottom end of the elastic member 25 to move away from the side wall of the pen housing 1, so that the limiting groove 26 is separated from the blocking protrusion 114, achieving the purpose of switching from the first state to the second state.

[0057] In a preferred embodiment, a launch spring 51 is sleeved outside the injection needle member 2. One end of the launch spring 51 abuts against the inner wall of the top of the hollow cylinder 11, and the other end abuts against the second blocking member 21.

[0058] As Figure 1 and Figure 2 As shown, when the injection needle member 2 is switched from the first state to the second state, the launch spring 51 is switched from the energy storage state to the energy release state, that is, from the compressed state to the stretched state, so that the injection needle member 2 and the blood collection needle 4 are ejected.

[0059] Wherein, a hollow cylinder 11 with both ends open is provided inside the pen housing 1. The injection needle member 2 is located inside the hollow cylinder 11. The second blocking member 21 is provided on the outer side wall of the injection needle member 2. The bottom end of the hollow cylinder 11 extends toward the pen housing 1 and is fixedly connected to the pen housing 1. The bottom end of the launch spring 51 is connected to the second blocking member 21, and the top end is connected to the inner wall top end of the hollow cylinder 11. Therefore, when the launch spring 51 releases the elastic stress, it only drives the injection needle member 2 and the blood collection needle 4 to move.

[0060] The needle retraction assembly includes a pen cap 3 provided at the end of the pen case 1 away from the blood collection needle 4, and a needle retraction rod 31 provided on the inner top wall of the pen cap 3. One end of the needle retraction rod 31 is connected to the inner top wall of the pen cap 3, and the other end passes through the needle shooting member 2 and abuts against the blood collection needle 4. The pen cap 3 and the needle retraction rod 31 can move toward the blood collection needle 4 side along the first direction to drive the blood collection needle 4 to separate from the needle shooting member 2;

[0061] A second blocking member 21 is provided on the outer wall of the needle shooting member 2, and a first component is provided on the pen cap 3. When the needle shooting member 2 is in the first state, the second blocking member 21 abuts against the first component to limit the pen cap 3 and the needle retraction rod 31 from moving toward the blood collection needle 4 side.

[0062] Such as Figure 1 、 Figure 3 And Figure 6 As shown, the needle retraction rod 31 is provided through the needle shooting member 2, and the bottom end of the needle retraction rod 31 abuts against the top end of the blood collection needle 4. When the pen cap 3 and the needle retraction rod 31 move downward, the blood collection needle 4 moves downward, so that the first protrusion 234 disengages from the groove 44, thereby achieving the purpose of separating the blood collection needle 4 from the needle fixing seat 23, which can be called a needle retraction operation. A third extension block 27 extending away from the first axis is provided on one side of the needle shooting member 2, and a third connecting block 112 is provided on the hollow cylinder 11. The projections of the third connecting block 112 and the third extension block 27 coincide in the vertical direction. Therefore, when the needle shooting member 2 moves downward, the third extension block 27 will contact the third connecting block 112, and the needle shooting member 2 is restricted by the third connecting block 112 and will not move downward, while the needle retraction rod 31 will continue to move downward, and the blood collection needle 4 can be extruded from the needle fixing seat 23.

[0063] A first blocking member 16 is provided on the inner wall of the pen case 1, and a second blocking member 21 is provided at the outer wall of the needle shooting member 2 close to the first blocking member 16. When the needle shooting member 2 is in the first state, the first blocking member 16 and the second blocking member 21 limit the pen cap 3 and the needle retraction rod 31 from moving toward the blood collection needle 4 side, that is, it is ensured that when in the "geared" state, the pen cap 3 and the needle retraction rod 31 cannot be pressed downward, and there will be no accidental operation of pressing the pen cap 3, resulting in the separation of the blood collection needle 4 and the needle shooting member 2.

[0064] During use, when the injection needle member 2 is in the first state, the blood collection needle 4 cannot be ejected and extended with the injection needle member 2. At this time, both the pen cap 3 and the needle retraction rod 31 are restricted by the first blocking member 16 and the second blocking member 21 and cannot move, and thus cannot drive the separation of the blood collection needle 4 and the injection needle member 2. When the injection needle member 2 is in the second state, the pen cap 3 can be pressed, and the needle retraction rod 31 is used to drive the separation of the blood collection needle 4 and the injection needle member 2, effectively solving the problem in the prior art that when the blood collection needle 4 and the bracket are restricted and cannot move, it is easy to operate incorrectly and cause the blood collection needle 4 to withdraw.

[0065] In a preferred embodiment, the first assembly includes:

[0066] A first blocking member 16, which is arranged on the inner wall of the pen case 1 away from the blood collection needle 4;

[0067] Two first mating members 32, which are arranged at the end of the pen cap 3 close to the blood collection needle 4, and the two first mating members 32 are respectively located on both sides of the first blocking member 16 along the second direction;

[0068] Each first mating member 32 includes: two first connecting rods distributed along the third direction, and a first connecting block 33 is fixedly connected between the two first connecting rods;

[0069] When the injection needle member 2 is in the first state, the second blocking member 21 abuts against the first connecting block 33, restricting the pen cap 3 and the needle retraction rod 31 from moving toward the blood collection needle 4 side;

[0070] When the injection needle member 2 is in the second state, the pen cap 3 and the needle retraction rod 31 can move toward the blood collection needle 4 side along the first direction.

[0071] As Figure 1 、 Figure 3 and Figure 6 shown, wherein, the second direction is the front-back direction in Figure 1 , the first blocking member 16 is a long strip integrally formed with the pen case 1, and the second blocking member 21 is a fifth extension block extending toward the side wall of the pen case 1. When the injection needle member 2 is in the first state, that is, in the "engaged" state, as Figure 3 shown, along the second direction, the distance between the first blocking member 16 and the second blocking member 21 is less than the thickness of the first connecting block 33. Therefore, the first connecting block 33 cannot pass through this distance and move downward;

[0072] Further, as Figure 6As shown, the first connecting block 33 is connected to the pen cap 3 through the first fitting 32, thereby restricting the downward movement of the pen cap 3. In addition, in order to improve the stability of the restriction, the number of the first blocking members 16 is set to two, and they are symmetrically arranged on the inner wall of the pen shell 1 from left to right. Further, the numbers of the second blocking member 21, the first connecting block 33, and the first fitting 32 need to correspond to the number of the first blocking members 16. By restricting the downward movement of the first connecting block 33 from both left and right sides, the stability of the restriction is improved.

[0073] As Figure 1 and Figure 3 shown, after using the button 113 to switch the needle shooting member 2 from the first state to the second state, under the action of the elastic stress released by the launching spring 51, the needle shooting member 2 and the blood collection needle 4 move downward. Consequently, the second blocking member 21 moves downward. Therefore, a gap is formed between the second blocking member 21 and the inner wall of the pen shell 1. At this time, if a needle retraction operation is performed, the first connecting block 33 can move downward and pass through the gap. Thus, the pen cap 3 and the needle retraction rod 31 can also move downward, squeezing the blood collection needle 4 downward to achieve the purpose of separating the blood collection needle 4 from the needle fixing seat 23. Optionally, first inclined surfaces are provided at both the top and bottom of the first connecting block 33 near the end of the first axis, and second inclined surfaces are provided at both the top and bottom of the second blocking member 21 away from the end of the first axis. The first inclined surface and the second inclined surface are parallel to each other, and the normal directions of both of them and the first direction have a first included angle. The opening of the first included angle faces the side of the blood collection needle 4, that is, the included angles between the first inclined surface and the second inclined surface and the vertical direction are both acute angles. The first fitting 32 has good toughness. By the abutment of the first inclined surface and the second inclined surface, the first connecting block 33 and the first fitting 32 can be driven to move away from the side of the first axis, thereby achieving the purpose of the first connecting block 33 passing through the gap.

[0074] In a preferred embodiment, a limiting component is provided inside the pen shell 1, and the limiting component is used to restrict the rotation of the needle shooting member 2 centered on the axis of the first space;

[0075] As Figure 1 、 Figure 2 and Figure 4 shown, the needle shooting member 2 cannot rotate on its own, so the situation where the blocking protrusion 114 is separated from the elastic member 25 will not occur, nor will the situation where the second blocking member 21 cannot cooperate with the first blocking member 16 after rotation occur. Therefore, the stability during the use of the blood collection pen is improved.

[0076] In a preferred embodiment, the limiting component includes a hollow cylinder 11 sleeved on the outer wall of the needle ejecting member 2 and fixedly connected to the inner wall of the pen housing 1. A first limiting groove 12 is provided on the side wall of the hollow cylinder 11, and the extending direction of the first limiting groove 12 is the first direction. The second blocking member 21 is slidably disposed in the first limiting groove 12, and the two side walls of the first limiting groove 12 along the second direction are respectively in contact with the side walls of the second blocking member 21;

[0077] As Figure 1 , Figure 2 and Figure 4 shown, by contacting the second blocking member 21 through the first limiting groove 12, after the second blocking member 21 is restricted, the needle ejecting member 2 will not rotate. In addition, the number of the first limiting grooves 12 corresponds to the number of the second blocking members 21, which has a better limiting effect. To further improve the stability of the needle ejecting member 2, in the left-right direction in Figure 2 , that is, in the front-back direction in Figure 1 , limiting blocks 24 are provided on both the left and right side walls of the needle ejecting member 2. The hollow cylinder 11 is provided with two second limiting grooves 13 extending in the first direction on the left and right. The limiting blocks 24 are placed in the second limiting grooves 13 on the same side, and the side walls are in contact with the inner walls of the second limiting grooves 13, which also plays a limiting role. Furthermore, under the dual limiting effects, it can ensure that the needle ejecting member 2 moves up and down more stably and will not rotate self around the first axis. In addition, the third connecting block 112 is disposed in the second limiting groove 13, and both ends are integrally formed and connected to the hollow cylinder 11. The third extending block 27 is placed in the second limiting groove 13 to ensure that the third extending block 27 can contact the third connecting block 112.

[0078] Furthermore, a transparent member 115 is embedded in the side wall of the pen housing 1, and a prompt area 28 is provided on the outer wall of the needle ejecting member 2. When the needle ejecting member 2 is in the first state, the prompt area 28 is aligned with the transparent member 115 in the first direction;

[0079] As Figure 2 shown, in the "geared up" state, the user can observe the prompt area 28 through the transparent member 115 to know that the needle ejecting member 2 has moved to the designated position. If the prompt area 28 cannot be observed, it proves that the blood collection pen has a malfunction and it is impossible to determine whether the blood collection needle 4 can be ejected. Therefore, it is necessary to stop blood collection in time and repair or replace the blood collection pen. Optionally, as Figure 2As shown, the prompt area 28 includes a first opening provided at the bottom of the needle shooting member 2, the needle retracting rod 31 is exposed, and a warning coating is applied on the surface of the needle retracting rod 31. The warning coating has a color that is significantly different from all other components of the blood collection pen. Therefore, through the transparent member 115, the warning coating exposed at the first opening can be observed.

[0080] Embodiment 2

[0081] Based on Embodiment 1, in this embodiment, it is proposed that a pen tip 6 is installed at the bottom end of the pen housing 1. A through hole for the blood collection needle 4 to extend out is provided in the pen tip 6. A third ring body 64 is also provided in the pen tip 6. The top end of the third ring body 64 has a stepped support surface 65. Rib plates 236 are provided on the mutually remote sides of the two arc-shaped plates 233. When the firing spring 51 drives the needle shooting member 2 and the blood collection needle 4 to move downward, the rib plates 236 are restricted by the stepped support surface 65 and will not continue to move downward, avoiding the blood collection needle 4 from being inserted too deeply into the patient's skin. Since the skin thickness of each patient is different, the pen tip 6 is rotated to drive the third ring body 64 to rotate, so that the rib plates 236 contact different stepped surfaces of the stepped support surface 65, making the length of the blood collection needle 4 extending out different to adapt to different patients. In addition, a fourth extension block 29 extending in a direction away from the first axis is provided at the top end of the needle shooting member 2. The fourth extension block 29 is the connection end. A compression spring 53 is sleeved on the top of the needle shooting member 2. One end of the compression spring 53 is connected to the bottom end of the fourth extension block 29, and the other end is connected to the top end of the hollow cylinder 11. When the firing spring 51 drives the needle shooting member 2 and the blood collection needle 4 to move downward, the compression spring 53 is compressed and in a state of storing energy. When the rib plate 236 contacts the stepped support surface 65, the needle shooting member 2 stops moving, and the compression spring 53 drives the blood collection needle 4 to move upward and retract into the blood collection pen, realizing that the blood collection needle 4 will not stay after piercing the skin, avoiding the situation that the needle of the blood collection needle 4 does not leave the skin after piercing the skin, and reducing medical accidents caused thereby.

[0082] Such as Figure 2 and Figure 5As shown, a first ring body 17 is provided at the bottom of the pen shell 1. A second ring body 18 is circumferentially provided in the middle of the first ring body 17. The pen shell 1, the second ring body 18, and the first ring body 17 are integrally formed. Two separation grooves 19 are provided at the bottom end of the pen shell 1. The separation grooves 19 have a second opening facing away from the pen cap 3 side. Thus, an elastic plate 110 is formed between the two separation grooves 19. A clamping block 111 is provided at the bottom of the elastic plate 110 on the side away from the first axis. At the top end of the inner wall of the pen tip 6, a number of first limiting strips 61 are provided. A second limiting strip 62 is provided in the middle of the inner wall of the pen tip 6. A plurality of clamping grooves 63 are circumferentially and arrayedly distributed on the inner wall of the second limiting strip 62. There is a second gap between the first limiting strip 61 and the second limiting strip 62. When the pen shell 1 is connected to the pen tip 6, the second ring body 18 is arranged in the second gap and can only rotate and cannot move up and down under the limitation of the first limiting strip 61 and the second limiting strip 62. When the pen tip 6 is rotated, the elastic plate 110 will contract towards the direction close to the first axis, so as to transfer from one clamping groove 63 to another clamping groove 63, completing the rotation of the pen tip 6. In addition, the number of each step surface of the clamping groove 63 corresponds to the number of each step surface of the stepped support surface 65, ensuring that there is a corresponding step surface for each rotation, so that the user can accurately rotate the pen tip 6 to adjust the length of the blood collection needle 4 extending out. Further, the step surfaces of the stepped support surface 65 are divided into two groups, and the heights of the two step surfaces on any diameter of the third ring body 64 are the same. The two rib plates 236 can respectively contact with the two step surfaces, improving the stability after the rib plates 236 contact with the step surfaces.

[0083] Embodiment 3

[0084] On the basis of Embodiment 1 and Embodiment 2, in this embodiment, considering that when using the blood collection pen, it may not be possible to pierce the skin for the first time and it is necessary to shift gears for the second time after the first needle exit and re-issue the needle once again. Therefore, a gear-shifting assembly is provided on the pen cap 3, and the gear-shifting assembly is used to switch the needle shooting member 2 from the second state back to the first state.

[0085] In a preferred embodiment, a second extension block 36 is provided on the pen cap 3. The second extension block 36 extends from the end of the pen cap 3 close to the blood collection needle 4 side towards the hollow cylinder 11 side;

[0086] The shifting component includes a first mating structure disposed between the pen cap 3 and the hollow cylinder 11. The side of the first mating structure away from the blood collection needle 4 has a connection end, and the connection end is connected to the pen cap 3. A return spring 52 is sleeved outside the first mating structure. The return spring 52 is in a state of storing energy, and one end of the return spring 52 abuts against the second extension block 36, and the other end abuts against the connection end.

[0087] Further, a first clamping groove 203 may be provided on the connection end, and the end of the return spring 52 away from the second extension block 36 can be stuck in the first clamping groove 203 to improve the stability of the return spring 52.

[0088] Further, when the needle shooting member 2 is in the second state, the return spring 52 is in a state of storing energy. When the needle shooting member 2 is in the first state, the return spring 52 is also in a state of storing energy, and the return spring 52 drives the pen cap 3 to reset.

[0089] Embodiment 4

[0090] On the basis of Embodiment 3, a specific implementation manner of the first mating structure is proposed:

[0091] The first connecting block 33 is disposed between the middle parts of the two first connecting rods. The first mating structure is a first vertical rod 14 disposed on the top of the hollow cylinder 11 and outside the end of the needle shooting member 2 away from the blood collection needle 4. The extending direction of the first vertical rod 14 is the first direction.

[0092] The shifting component further includes:

[0093] A third blocking member 22, which is disposed on the needle shooting member 2;

[0094] A second connecting block 34, which is disposed between the bottoms of the two first connecting rods. The third blocking member 22 is located between the two first mating members 32 and slides between the first connecting block 33 and the second connecting block 34.

[0095] Specifically, the second connecting member 34 is disposed on the side of the third blocking member 22 close to the blood collection needle 4, and the projections of the third blocking member 22 and the second connecting block 34 in the first direction coincide.

[0096] Such as Figure 1 、 Figure 2 、 Figure 6 and Figure 7As shown, the third blocking member 22 is a sixth extension block facing the inner wall of the pen case 1. Since the projections of the third blocking member 22 and the second connecting block 34 coincide in the first direction, when the pen cap 3 is pulled upward, the second connecting block 34 is driven to move upward by the first fitting member 32. The second connecting block 34 pushes the third blocking member 22 upward, achieving the purpose of driving the needle shooting member 2 to move upward by the third blocking member 22, and when the elastic member 25 passes over the blocking protrusion 114, it stops, completing the second gear engagement. Among them, the pen cap 3 is in Figure 1 The third limiting grooves 37 adapted to the first blocking member 16 are arranged on the left and right sides. When the pen cap 3 moves up and down, the first blocking member 16 is placed in the third limiting grooves 37, which neither interferes with the up and down movement of the pen cap 3 nor restricts the rotation of the pen cap 3 around the axis of the first space.

[0097] As Figure 1 shown, after the second gear engagement is completed, the needle shooting member 2 is in the first state, that is, the engaged state. The return spring 52 drives the pen cap 3 to reset, that is, drives the second connecting block 34 to reset. At this time, a first stroke is reserved between the second connecting block 34 and the third blocking member 22 in the first direction. When the needle shooting member 2 switches from the first state to the second state, the firing spring 51 drives the needle shooting member 2 to move downward, and the distance that the needle shooting member 2 moves downward is recorded as the second stroke. The second stroke is less than the first stroke. Therefore, during the downward movement of the needle shooting member 2, the situation where the third blocking member 22 touches the second connecting block 34 will not occur, avoiding the second connecting block 34 interfering with the stable downward movement of the needle shooting member 2. In addition, as Figure 2 shown, the pen cap 3 is in Figure 2 The second vertical rods 35 are provided on both the left and right sides. The bottom end of the second vertical rod 35 is provided with a second extension block 36 extending toward the first axis side. As Figure 1 and Figure 4 shown, the hollow cylinder 11 is in Figure 4 On both the left and right sides, that is, Figure 2 On the front and back sides of the first vertical rods 14 are symmetrically provided. The top end of the first vertical rod 14 is provided with the first extension block 15 extending away from the first axis side. The top end of the return spring 52 is connected to the bottom end of the first extension block 15, and the bottom end of the return spring 52 is connected to the top end of the second extension block 36, achieving the purpose that when the pen cap 3 is pulled upward, the second extension block 36 can compress the return spring 52 when moving upward.

[0098] Embodiment 5

[0099] Based on Embodiment 3, this embodiment proposes a first mating structure that is simpler in structure than that in Embodiment 4. Specifically:

[0100] The first mating structure is a first extension portion 201 formed by extending the injection needle member 2 away from the end of the blood collection needle 4 towards the inner wall of the pen cap 3.

[0101] Please refer to Figure 10 and Figure 11 As shown, different from the injection needle member 2 in Embodiment 1 that is approximately a hollow cylindrical shape on the side away from the blood collection needle 4 as in Figure 7 , in this embodiment, by optimizing the structure of the injection needle member 2, the function of the second gear shifting is realized. Specifically, the injection needle member 2 includes two symmetrical cylinders, which diverge towards the pen cap 3 at the end away from the blood collection needle 4, presenting an inverted V shape. This ingenious structure can not only directly connect the injection needle member 2 to the pen cap 3, but also directly sleeved the return spring 52 outside it. The connection end 203 is provided at the end of the extension portion 201 close to the pen cap 3. The connection end 203 is used to connect the injection needle member 2 and the pen cap 3. A first clamping groove 202 is further provided on the side of the connection end 203 close to the blood collection needle 4. The first clamping groove 202 is used to pull the pen cap 3, and the return spring 52 is snapped into it to drive the injection needle member 2 to move upward until the gear is engaged.

[0102] Compared with the above-mentioned gear shifting assembly, the gear shifting assembly proposed in this embodiment has a simpler structure, omitting structures such as the second blocking member 21, the second connecting block 34, the first vertical rod 14, and the first extension block 15. The integral processing is simpler, and the possibility of jamming due to the simple structure is smaller, and the use feeling is more comfortable.

[0103] Embodiment 6

[0104] Based on Embodiment 3, this embodiment further proposes another first mating structure that is simpler in structure than that in Embodiment 4. Specifically, please refer to Figure 12 As shown:

[0105] A second extension portion 204 is formed by extending the injection needle member 2 away from the end of the blood collection needle 4 towards the top inner wall of the pen cap 3. The return spring 52 is sleeved outside the second extension portion 204. The return spring 52 is a conical spring, facing the direction from the blood collection needle 4 towards the pen cap 3. The inner diameter of the return spring 52 gradually becomes smaller, and the small inner diameter end of the return spring 52 is clamped in the first clamping groove 203 at the connection end of the second extension portion 204.

[0106] In summary, the blood collection pen includes the pen shell 1, the pen cap 3, and the pen tip 6. Except for the needle shooting member 2 that needs to move synchronously with the blood collection needle 4 and the springs, the rest are integrally formed. It has fewer structural components compared to those on the existing market, facilitating rapid production and installation, improving production efficiency and assembly efficiency. And when it is damaged, the corresponding pen shell 1, pen cap 3, pen tip 6, or needle shooting member 2 can be directly replaced, avoiding the cumbersome situation of excessive parts replacement; for the pen shell 1, the hollow cylinder 11, the button 113, the first ring 17, the elastic plate 110, etc. are all integrally formed with the pen shell 1; for the pen cap 3, the first fitting 32, the first connecting block 33, the second vertical rod 35, etc. are all integrally formed with the pen cap 3.

[0107] Embodiment 7

[0108] Based on Embodiments 1, 2, 3, 4, and 5, the usage process of the blood collection pen provided in this embodiment is as follows:

[0109] Step 1: Insert the blood collection needle 4 through the pen tip 6 and into the space between the two arc-shaped plates 233, and lock it in the groove 44 by the first protrusion 234 to complete the installation of the blood collection needle 4.

[0110] Step 2: Push the blood collection needle 4 upward. The blood collection needle 4 drives the needle shooting member 2 to move upward synchronously through the sleeve 231, and the launch spring 51 contracts and accumulates elastic stress. After the bottom end of the elastic member 25 passes over the blocking protrusion 114, stop pushing the blood collection needle 4. Under the action of the elastic stress released by the launch spring 51, the blocking protrusion 114 is placed in the limiting groove 26, and the blocking protrusion 114 prevents the elastic member 25, the needle shooting member 2, and the blood collection needle 4 from moving downward.

[0111] Step 3: Rotate the needle cap 43 to separate the needle cap 43 from the needle sleeve 42, and expose the needle body 41 placed in the needle sleeve 42.

[0112] Step 4: Press the button 113 to drive the bottom end of the elastic member 25 to move toward the axis side of the first space. Then, under the action of the elastic stress released by the launch spring 51, drive the needle shooting member 2 and the blood collection needle 4 to move downward. When one of the stepped surfaces of the rib plate 236 and the stepped support surface 65 comes into contact, the needle shooting member 2 stops moving downward. At this time, the blood collection needle 4 extends out of the pen tip 6 and pierces the patient's skin for blood collection; in addition, during the launch process, the contraction spring 53 compresses, and under the action of the elastic stress when the contraction spring 53 returns to its original shape after the needle shooting member 2 stops, drive the needle shooting member 2 and the blood collection needle 4 to retract into the pen tip 6.

[0113] If, after the above steps 1-4 are completed and the skin has been successfully punctured, perform the following steps:

[0114] Step 5: Press down the pen cap 3, driving the needle retracting rod 31 to move downward. When the third extension block 27 is blocked by the third connecting block 112, the needle shooting member 2 cannot continue to move downward. At this time, continue to press the pen cap 3, and the needle retracting rod 31 continues to move downward and squeezes the blood collection needle 4, extruding the blood collection needle 4 from between the two arc-shaped plates 233.

[0115] Embodiment 7

[0116] Based on Embodiment 6, if the skin has not been successfully punctured after the above steps 1-4 are completed, perform the following steps:

[0117] Step 6: Rotate the pen tip 6, and the elastic plate 110 provided on the first ring body 17 is transferred from one card slot 63 to another card slot 63. Since the number of each step surface of the card slot 63 corresponds to the number of step surfaces of the stepped support surface 65 one by one, when the elastic plate 110 is transferred, the rib plate 236 corresponds to another step surface;

[0118] Step 7: Pull the pen cap 3, and use the method described in Embodiment 4 or Embodiment 5 or Embodiment 6 to drive the needle shooting member 2 to move upward. The launch spring 51 contracts and accumulates elastic stress. After the bottom end of the elastic member 25 passes over the blocking protrusion 114, stop pulling the pen cap 3. Under the action of the elastic stress released by the launch spring 51, the blocking protrusion 114 is placed in the limiting groove 26, and the blocking protrusion 114 prevents the elastic member 25, the needle shooting member 2, and the blood collection needle 4 from moving downward;

[0119] Step 8: The operation is the same as that in Step 4, but since the step surface with which the rib plate 236 abuts is different from the step surface in Step 4, the length of the blood collection needle 4 extending out is different;

[0120] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application. The above are only the preferred implementation manners of the present application. It should be noted that due to the limited nature of written expression and objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, refinements or changes can be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the present invention to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A blood collection device, characterized in that: include: A pen case (1), wherein the pen case (1) has a first space therein, and the extension direction of the first space is a first direction; A needle member (2) is arranged in the first space and can move along the first direction. A blood collection needle (4) is arranged at the bottom end of the needle member (2). A limiting member is arranged on the inner wall of the pen housing (1). The needle member (2) has a first state and a second state. When in the first state, the limiting member contacts the needle member (2) and limits the movement of the needle member (2) along the first direction toward the blood collection needle (4). When in the second state, the limiting member is separated from the needle member (2) and the needle member (2) can move toward any side along the first direction. The needle withdrawal assembly comprises a pen cap (3) arranged at the end of the pen housing (1) away from the blood collection needle (4), and a needle withdrawal rod (31) arranged on the inner top wall of the pen cap (3), one end of the needle withdrawal rod (31) is connected to the inner top wall of the pen cap (3), and the other end passes through the needle ejection member (2) and abuts against the blood collection needle (4), the pen cap (3) and the needle withdrawal rod (31) can move along the first direction toward the side of the blood collection needle (4), so as to drive the blood collection needle (4) to separate from the needle ejection member (2); A second blocking member (21) is provided on the outer wall of the needle ejection member (2), and a first component is provided on the pen cap (3); when the needle ejection member (2) is in the first state, the second blocking member (21) abuts against the first component, thereby limiting the movement of the pen cap (3) and the needle withdrawal rod (31) toward the side of the blood collection needle (4).

2. The blood collection device according to claim 1, characterized in that: The first component comprises: A first blocking member (16), the first blocking member (16) being arranged on an inner wall of the pen housing (1) away from the blood collection needle (4); Two first matching parts (32), the two first matching parts (32) being arranged at the end of the pen cap (3) close to the blood collection needle (4), and the two first matching parts (32) being respectively located on both sides of the first blocking part (16) along the second direction; Each of the first matching parts (32) comprises: two first connecting rods distributed along a third direction, a first connecting block (33) being fixedly connected between the two first connecting rods; When the needle ejection member (2) is in the first state, the second blocking member (21) abuts against the first connecting block (33), thereby restricting the pen cap (3) and the needle withdrawal rod (31) from moving toward the side of the blood collection needle (4); When the needle ejection member (2) is in the second state, the pen cap (3) and the needle withdrawal rod (31) can move along the first direction toward the side of the blood collection needle (4).

3. The blood collection device according to claim 2, characterized in that: The pen cap (3) is provided with a shifting assembly, and the shifting assembly is used to switch the needle-shooting member (2) from the second state back to the first state.

4. The blood collection device according to claim 3, characterized in that: A limiting assembly is provided in the pen housing (1), and the limiting assembly is used to limit the needle-shooting component (2) from rotating around the axis of the first space.

5. The blood collection device according to claim 4, characterized in that: The limiting assembly comprises a hollow cylinder (11), the hollow cylinder (11) being sleeved on the outer wall of the needle-shooting member (2) and fixedly connected to the inner wall of the pen housing (1), the side wall of the hollow cylinder (11) being provided with a first limiting groove (12), the extension direction of the first limiting groove (12) being the first direction, the second blocking member (21) being slidably arranged in the first limiting groove (12), and the two side walls of the first limiting groove (12) along the second direction respectively contact the side walls of the second blocking member (21).

6. The blood collection device according to claim 1, characterized in that: The needle-shooting component (2) comprises an elastic component (25), the limiting component comprises a blocking protrusion (114) provided on the inner wall of the pen housing (1) and extending toward the axis side of the first space, the side wall of the pen housing (1) is provided with a button (113), the button (113) has a launching end, the launching end can move toward the axis side of the first space, drive the elastic component (25) to move toward the axis side of the first space, and separate from the blocking protrusion (114), so that the limiting component is separated from the needle-shooting component (2).

7. The blood collection device according to claim 5, characterized in that: The needle-shooting member (2) is provided with a launching spring (51) on its outer sleeve, one end of the launching spring (51) abuts against the inner wall of the top of the hollow cylinder (11), and the other end abuts against the second blocking member (21).

8. The blood collection device according to claim 5, characterized in that: The pen cap (3) is provided with a second extension block (36), and the second extension block (36) is formed by extending the end of the pen cap (3) close to the blood collection needle (4) towards the hollow cylinder (11); The engaging assembly comprises a first matching structure arranged between the pen cap (3) and the hollow cylinder (11), the first matching structure having a connecting end on the side away from the blood collection needle (4), the connecting end being connected to the pen cap (3); a return spring (52) is provided on the outer sleeve of the first matching structure; the return spring (52) is in a force storage state, and one end of the return spring (52) abuts against the second extension block (36), and the other end abuts against the connecting end.

9. The blood collection device according to claim 8, characterized in that: The first connecting block (33) is arranged between the middle parts of the two first connecting rods; the first matching structure is a first vertical rod (14) arranged at the top of the hollow cylinder (11) and arranged on the outer side of the needle-shooting member (2) away from the end of the blood collection needle (4), and the extension direction of the first vertical rod (14) is the first direction; The gear shifting assembly also includes: A third blocking member (22), the third blocking member (22) being arranged on the needle-shooting member (2); A second connecting block (34), the second connecting block (34) is arranged between the bottoms of the two first connecting rods, and the third blocking member (22) is located between the two first matching members (32) and slides between the first connecting block (33) and the second connecting block (34).

10. The blood collection device according to claim 8, characterized in that: The first matching structure is a first extension portion (201) formed by the needle-shooting component (2) extending away from the end of the blood collection needle (4) towards the inner side wall of the pen cap (3).

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