Blood sampling pen

Abstract

The embodiment of the invention provides a blood sampling pen, a needle core in the blood sampling pen comprises a blocking part and a needle seat, a needle withdrawing rod comprises an elastic part, and when a blood sampling needle on the needle seat is in a to-be-launched state, the blocking part abuts against the elastic part to prevent the needle withdrawing rod from triggering the needle withdrawing action of the blood sampling pen. For example, the needle withdrawing operation is executed after needle mounting and chambering, the needle withdrawing action of the blood sampling pen cannot be triggered, and the safety is improved.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to a blood collection pen. Background Art

[0002] A lancing pen is a pen-shaped blood collection device that is used with a disposable lancet to collect blood samples from the human body. The operation process of a lancing pen usually includes needle loading, loading, firing, and needle withdrawal. These steps usually need to be performed in sequence, but if the user operates improperly, such as withdrawing the needle after loading and loading, it will bring safety risks. Summary of the invention

[0003] In order to alleviate or solve the above problems, the present invention provides a blood collection pen.

[0004] An embodiment of the present invention provides a blood collection device, comprising:

[0005] A needle core, including a needle seat suitable for holding a blood collection needle;

[0006] Needle withdrawal rod;

[0007] in:

[0008] The needle core includes a blocking portion, and the needle withdrawal rod includes an elastic portion. When the lancing needle is in a ready-to-fire state, the blocking portion abuts against the elastic portion to prevent the needle withdrawal rod from triggering the needle withdrawal action of the lancing pen.

[0009] Optionally, the lancing pen further comprises:

[0010] The housing comprises a second extrusion portion; at least a portion of the needle core is disposed inside the housing;

[0011] When the needle core moves toward the distal end to the ready-to-fire state, the second pressing portion presses the elastic portion to cause deformation, so that the blocking portion abuts against the elastic portion.

[0012] Optionally, during the process of the needle withdrawal rod moving proximally to the needle withdrawal state, the second extrusion portion disengages from the elastic portion, and the elastic portion returns to an undeformed state, so that the blocking portion disengages from the elastic portion.

[0013] Optionally, the lancing pen further comprises:

[0014] The needle withdrawal key is suitable for pushing the elastic part to return to an undeformed state.

[0015] Optionally, the needle withdrawal key includes a wedge-shaped portion, and the inclined surface of the wedge-shaped portion applies a thrust away from the axial direction of the lancing pen to the elastic portion.

[0016] Optionally, the lancing pen further comprises:

[0017] The tail cap comprises a tail cap elastic wall extending along the axial direction of the lancing pen,

[0018] Wherein: the tail cap elastic wall is provided with a launch part, and when the tail cap elastic wall is pressed, the launch part is suitable for triggering the blood collection action of the blood collection pen.

[0019] Optionally, the lancing pen further comprises: a second elastic member;

[0020] The needle core further comprises a fourth elastic arm, the end surface of which is adapted to abut against an abutment portion provided on the inner wall of the lancing pen when the lancing needle is in a state ready to be fired;

[0021] Wherein: when the tail cap elastic wall is pressed, the launching part pushes the fourth elastic arm to separate from the abutting part, so that the needle core moves toward the proximal end under the drive of the second elastic member.

[0022] Optionally, the lancing pen further comprises:

[0023] A tail cap, comprising a tail cap elastic wall extending along the axial direction of the lancing pen;

[0024] The needle withdrawal key is slidably arranged on the tail cap elastic wall in the axial direction, and the needle withdrawal action of the lancing pen is triggered based on the predetermined movement of the needle withdrawal key in the axial direction.

[0025] Optionally, the lancing pen further comprises:

[0026] a tail cap inner core, at least a portion of which is disposed inside the tail cap;

[0027] A blocking member is arranged inside the inner core of the tail cap;

[0028] in:

[0029] When the needle withdrawal key moves axially toward the proximal end, the needle withdrawal rod is pushed to move axially toward the proximal end until the blocking member abuts against the inner core of the tail cap, thereby triggering the needle withdrawal action of the lancing pen.

[0030] Optionally, the distal end surface of the needle core abuts against the distal end surface of the blocking member, and the needle withdrawal rod is connected to the needle core;

[0031] When the needle withdrawal key moves axially toward the proximal end, it pushes the needle withdrawal rod to move axially toward the proximal end, and drives the needle core to move axially toward the proximal end, until the proximal surface of the blocking member abuts against the proximal surface of the tail cap inner core, blocking the needle core from continuing to move toward the proximal end, so that the needle withdrawal rod pushes the blood collection needle out of the needle seat.

[0032] Optionally, the tail cap spring wall is provided with a launch part, and when the tail cap spring wall is pressed, the launch part is suitable for triggering the blood collection action of the lancing pen.

[0033] Optionally, the lancing pen further comprises:

[0034] A pen cap, provided with a pen cap hole suitable for inserting a blood collection needle;

[0035] The outer shell has an inner wall provided with a first limiting portion;

[0036] in:

[0037] The needle core further comprises a first elastic arm, and when the needle withdrawal rod is located at the needle withdrawal position, the first elastic arm is driven to be located at a first radial position, and when the needle withdrawal rod is located at the needle loading position, the first elastic arm is driven to be located at a second radial position;

[0038] The first elastic arm is adapted to abut against the first limiting portion in the first radial position to prevent the needle core from moving toward the distal end to the ready-to-fire state, and to disengage from the first limiting portion in the second radial position.

[0039] Optionally, the needle withdrawal rod includes a first extrusion portion;

[0040] The first squeezing portion is suitable for squeezing the first elastic arm to deform in the direction away from the axis of the lancing pen when the needle withdrawal rod is in the needle withdrawal position, so that the first elastic arm reaches the first radial position; and squeezing the first elastic arm to deform in the direction close to the axis of the lancing pen when the needle withdrawal rod is in the needle loading position, so that the first elastic arm reaches the second radial position.

[0041] Optionally, the needle core further includes a connecting plate, which is connected to the first elastic arm and is disposed on one side of the first elastic arm close to the axial direction of the lancing pen;

[0042] The connecting plate is provided with a first guide structure, and the first extrusion portion is suitable for moving in the first guide structure to squeeze the first elastic arm to deform in a direction away from or close to the axis of the lancing pen.

[0043] Optionally, the first guide structure includes a first portion of a slot body, a second portion of a slot body and a third portion of a slot body, the distance between the first portion of the slot body and the lancing device in the axial direction is greater than the distance between the third portion of the slot body and the lancing device in the axial direction, and the second portion of the slot body is disposed between the first portion of the slot body and the third portion of the slot body;

[0044] When the first extrusion portion is located in the first part of the groove body, the first elastic arm is squeezed to deform toward the axial direction of the lancing pen. When the first extrusion portion is located in the third part of the groove body, the first elastic arm is squeezed to deform toward the axial direction away from the lancing pen.

[0045] Optionally, the needle core further comprises a second elastic arm, and the second elastic arm is closer to the distal end than the first elastic arm;

[0046] The inner wall of the housing is further provided with a second limiting portion, and the second limiting portion is closer to the distal end than the first limiting portion;

[0047] When the needle core is in a non-ready-to-fire state, the second elastic arm abuts against the second limiting portion, and during the process of moving toward the distal end to the ready-to-fire state, the second elastic arm disengages from the second limiting portion.

[0048] Optionally, the lancing pen further comprises:

[0049] shell;

[0050] A tail cap, disposed at the distal end of the housing;

[0051] a tail cap inner core, at least a portion of which is disposed inside the tail cap;

[0052] A tail cap rotor, disposed at a distal end of the tail cap and adapted to rotate relative to the tail cap;

[0053] Wherein, the rotation of the tail cap rotor is suitable for driving the tail cap inner core to move axially to adjust the puncture depth of the blood collection needle.

[0054] Optionally, a second protrusion is provided on the inner wall of the tail cap, and a second spiral guide groove is provided on the outer wall of the tail cap inner core, and the second protrusion is suitable for cooperating with the second guide groove so that the tail cap inner core generates axial displacement while rotating relative to the tail cap.

[0055] Optionally, a first matching portion is provided on the outer wall of the tail cap inner core, and a second matching portion is provided on the inner wall of the tail cap rotor, and the first matching portion matches with the second matching portion so that the tail cap rotor drives the tail cap inner core to rotate together.

[0056] Optionally, the needle core is arranged inside the outer shell and extends to the inside of the tail cap inner core, wherein,

[0057] A blocking member and a first elastic member are provided inside the tail cap inner core. Under the action of the tail cap inner core and the first elastic member, the blocking member drives the needle core to perform axial movement within a preset range.

[0058] In the embodiment shown in the present invention, the needle core includes a blocking part and a needle seat, the needle withdrawal rod includes an elastic part, and when the lancing needle on the needle seat is in a ready-to-fire state, the blocking part abuts against the elastic part to prevent the needle withdrawal rod from triggering the needle withdrawal action of the lancing pen. It can be seen that in this solution, even if the user operates improperly, such as performing the needle withdrawal operation after the needle is installed and loaded, the needle withdrawal action of the lancing pen will not be triggered, thereby improving safety.

[0059] Of course, it is not necessary to achieve all of the advantages described above at the same time to implement any product or method of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0061] Figure 1-3 It is a schematic structural diagram of a needle core in an exemplary embodiment of the present invention;

[0062] Figure 4-5 It is a structural schematic diagram of a needle withdrawal rod in an exemplary embodiment of the present invention;

[0063] Figure 6-8 is a schematic structural diagram of a housing in an exemplary embodiment of the present invention;

[0064] Figure 9-10 It is a structural schematic diagram of a needle withdrawal key in an exemplary embodiment of the present invention;

[0065] Fig.11a It is a schematic diagram of a partial structure of a blood collection device in an exemplary embodiment of the present invention;

[0066] Fig.11b It is a schematic diagram of a partial structure enlargement of a blood collection device in an exemplary embodiment of the present invention;

[0067] Figure 12-14 is a schematic structural diagram of a tail cap in an exemplary embodiment of the present invention;

[0068] Figure 15-16 It is a schematic structural diagram of a tail cap inner core in an exemplary embodiment of the present invention;

[0069] Figure 17-19 is a schematic structural diagram of a pen cap in an exemplary embodiment of the present invention;

[0070] Fig. 20 It is a schematic diagram of a first elastic arm abutting against a first limiting portion in an exemplary embodiment of the present invention;

[0071] Fig.21 It is a schematic diagram of a first elastic arm disengaging from a first limiting portion in an exemplary embodiment of the present invention;

[0072] Fig. 22 is a structural schematic diagram of a first guide structure in an exemplary embodiment of the present invention;

[0073] Figure 23-24 is a schematic structural diagram of a tail cap rotor in an exemplary embodiment of the present invention;

[0074] Fig.25 It is a structural schematic diagram of a blood collection device in an exemplary embodiment of the present invention;

[0075] Fig.26 An exploded diagram of a lancing device in an exemplary embodiment of the present invention;

[0076] Figure 27a-27b It is a schematic diagram of the cooperation between the needle core and the needle withdrawal rod in an exemplary embodiment of the present invention;

[0077] Fig.28 It is a schematic diagram of the structure of the blood collection device in an exemplary embodiment of the present invention when the blood collection device is in a state where the needle is not installed and the chamber is not loaded;

[0078] Figure 29-30 This is a schematic diagram of the structure of a blood collection device after a blood collection needle is installed in an exemplary embodiment of the present invention;

[0079] Fig.31 This is a schematic diagram of the structure of a blood collection device in an exemplary embodiment of the present invention after a blood collection needle is installed and the needle cap is twisted off;

[0080] Figure 32-38 It is a structural schematic diagram of a blood collection device in an exemplary embodiment of the present invention during a loading action;

[0081] Figure 39-41 It is a structural schematic diagram of a blood collection device in an exemplary embodiment of the present invention during the firing action;

[0082] Figure 42-46 It is a structural schematic diagram of the blood collection device in an exemplary embodiment of the present invention during the needle withdrawal action;

[0083] Fig.47 The figure is a schematic structural diagram of a blood collection pen in which the second elastic arm is omitted in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0084] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the present invention.

[0085] In order to achieve the above-mentioned purpose, the embodiment of the present invention provides a blood collection device, comprising: a needle core 2 and a needle withdrawal rod 3, Figure 1-3 is a schematic structural diagram of a needle core 2 in an exemplary embodiment of the present invention, Figure 4-5 FIG. 2 is a schematic diagram of the structure of the needle withdrawal rod 3 in an exemplary embodiment of the present invention. Figure 1 As shown, the needle core 2 includes a needle seat 213 suitable for holding the blood collection needle and a blocking portion 205. Figure 4-5 As shown, the needle withdrawal rod includes an elastic portion 300, Figure 4-5 302 , 307 , 305 , and 308 shown in the figure are respective surfaces of the elastic portion 300 .

[0086] like Fig.11a As shown, the blood collection needle is in the state of being ready to be fired, and the blocking portion 205 abuts against the elastic portion 300 to prevent the needle withdrawal rod 3 from triggering the needle withdrawal action of the blood collection pen ( Fig.11a The blood collection needle 12 is not shown).

[0087] The "ready to fire state" mentioned here can be understood as the "loaded state". In this solution, the lancing needle on the needle holder is in the ready to fire state, and the blocking part abuts against the elastic part to prevent the needle withdrawal rod from triggering the needle withdrawal action of the lancing pen. In this way, even if the user operates improperly, such as performing the needle withdrawal operation after the needle is installed and loaded, the needle withdrawal action of the lancing pen will not be triggered, thereby improving safety.

[0088] In an exemplary embodiment of the present invention, the lancing device further comprises a housing 4. Figure 6-8 FIG. 4 is a schematic diagram of the structure of the housing 4 in an exemplary embodiment of the present invention. Figure 6 As shown, the housing 4 includes a second extrusion portion 410; at least a portion of the needle core 2 is disposed inside the housing 4; Fig.11a As shown, when the needle core 2 moves toward the distal end to the ready-to-fire state, the second pressing portion 410 presses the elastic portion 300 to deform, so that the blocking portion 205 abuts against the elastic portion 300 .

[0089] Alternatively, in other exemplary embodiments, the elastic part 300 may be squeezed by other structures in the lancing device so that the blocking part 205 abuts against the elastic part 300. The specific structure is not limited. For example, some lancing devices are provided with inner sleeves, outer sleeves and other components, and protrusions may be provided on these components to squeeze the elastic part 300 so that the blocking part 205 abuts against the elastic part 300. Alternatively, a deformable elastic part may be provided on the needle core, and a blocking part may be provided on the needle withdrawal rod.

[0090] In an exemplary embodiment of the present invention, when the needle withdrawal rod 3 moves proximally to the needle withdrawal state, the second extrusion portion 410 disengages from the elastic portion 300, and the elastic portion 300 returns to an undeformed state, so that the blocking portion 205 disengages from the elastic portion 300.

[0091] The proximal end mentioned in the embodiment of the present invention can be understood as the proximal end of blood collection, that is, the end close to the blood collection position, and the distal end can be understood as the distal end of blood collection, that is, the end far away from the blood collection position.

[0092] This embodiment does not limit the specific needle withdrawal structure. Fig.44 As shown, after the blood collection needle 12 is fired, the needle withdrawal operation is performed. When the needle withdrawal key 6 moves axially toward the proximal end, the needle withdrawal rod 3 is pushed to move axially toward the proximal end, and the needle core 2 is driven to move axially toward the proximal end, until the proximal end surface 803 of the blocking member 8 abuts against the proximal end surface 703 of the tail cap inner core 7, thereby blocking the needle core 2 from continuing to move toward the proximal end, and the needle withdrawal rod 3 continues to move toward the proximal end relative to the needle core 2, and the needle withdrawal rod 3 withdraws the blood collection needle 12 from the needle seat 213, and the blood collection needle 12 falls off.

[0093] It can be seen that in this embodiment, on the one hand, even if the needle withdrawal operation is performed after the needle is loaded and loaded, the needle withdrawal action of the lancing pen will not be triggered, thereby improving safety. On the other hand, the lancing needle can be withdrawn normally after firing, without affecting normal use.

[0094] In an exemplary embodiment of the present invention, the lancing device further comprises: a needle withdrawal key 6, Figure 9-10 Schematic diagram of the structure of the needle withdrawal key 6 in an exemplary embodiment of the present invention. The needle withdrawal key 6 is suitable for pushing the elastic part 300 to return to an undeformed state.

[0095] In this embodiment, if the elastic portion 300 cannot be completely restored to the undeformed state, the needle withdrawal key 6 can assist the elastic portion 300 to be completely restored to the undeformed state.

[0096] For example, when the needle withdrawal key 6 pushes the needle withdrawal rod 3, a force is applied to the elastic part 300, and the force is opposite to the force applied to the elastic part 300 by the second extrusion part 410. The force applied by the needle withdrawal key 6 restores the elastic part 300 to an undeformed state.

[0097] In an exemplary embodiment of the present invention, Fig. 9 As shown, the needle withdrawal key 6 includes a wedge-shaped portion 604, such as Fig.11b As shown, the inclined surface of the wedge-shaped portion 604 applies a thrust away from the axial direction of the lancing pen to the elastic portion 300 ( Fig.11b In this way, the elastic structure of the needle withdrawal rod is restored to a natural state.

[0098] In an exemplary embodiment of the present invention, the blood collection device further includes: a tail cap 5, Figure 12-14 FIG. 5 is a schematic diagram of the structure of a tail cap 5 in an exemplary embodiment of the present invention. Fig.12 As shown, the tail cap 5 includes a tail cap elastic wall 501 extending along the axial direction of the lancing pen, wherein: the tail cap elastic wall 501 is provided with a launch part 504, and when the tail cap elastic wall 501 is pressed, the launch part 504 is suitable for triggering the blood collection action of the lancing pen.

[0099] In this embodiment, the firing function is achieved through the tail cap spring wall, and there is no need to set an additional firing key. It can be seen that this solution reduces components and simplifies the structure.

[0100] In an exemplary embodiment of the present invention, Figure 3 As shown, the needle core 2 includes a fourth elastic arm 204. Fig.11a As shown, the end surface 216 of the fourth elastic arm 204 is suitable for abutting against the abutment portion 105 provided on the inner wall of the lancing pen when the lancing needle 12 is in the ready-to-fire state.

[0101] The blood collection device also includes: a second elastic member 10, such as Fig.11a As shown, when the tail cap elastic wall 501 is pressed, the launching portion 504 pushes the fourth elastic arm 204 to separate from the abutting portion 105 , so that the needle core 2 moves toward the proximal end under the drive of the second elastic member 10 .

[0102] For example, the abutment portion 105 can be disposed on the inner wall of the lancing device housing, or on the inner wall of the lancing device cap, and the specific location is not limited.

[0103] As mentioned above, the "ready to fire state" can be understood as the "loaded state". The embodiments of the present invention do not limit the specific structures involved in the loading, firing and other actions of the lancing pen. For example, when the lancing needle is in the ready to fire state, other structures such as snap-on connection can be used to keep the needle core in the corresponding position.

[0104] In an exemplary embodiment of the present invention, the blood collection device further includes: a tail cap 5 and a needle withdrawal key 6. Fig.12 As shown, the tail cap 5 includes a tail cap elastic wall 501 extending along the axial direction of the lancing pen. Fig.11aAs shown, the needle withdrawal key 6 is slidably arranged on the tail cap elastic wall 501 in the axial direction of the lancing device, and the needle withdrawal action of the lancing device is triggered based on the predetermined sliding of the needle withdrawal key 6 in the axial direction.

[0105] In this embodiment, the needle withdrawal function is realized on the elastic wall of the tail cap, thereby simplifying the structure.

[0106] In an exemplary embodiment of the present invention, the lancing device further comprises: an inner core of a tail cap 7 , a needle withdrawal rod 3 and a blocking member 8 . Figure 15-16 Schematic diagram of the structure of the tail cap inner core 7 in an exemplary embodiment of the present invention. At least a portion of the tail cap inner core 7 is disposed inside the tail cap 5 .

[0107] The blocking member 8 is arranged inside the tail cap inner core 7; Fig.44 As shown, when the needle withdrawal key 6 moves axially toward the proximal end, it pushes the needle withdrawal rod 3 to move axially toward the proximal end until the blocking member 8 abuts against the inner core 7 of the tail cap, thereby triggering the needle withdrawal action of the lancing device.

[0108] The embodiment of the present invention does not limit the specific needle withdrawal structure.

[0109] In an exemplary embodiment of the present invention, Fig.44 As shown, the distal end surface (the end surface on the inner side of the distal end) of the needle core 2 abuts against the distal end surface of the blocking member 8, and the needle withdrawal rod 3 is connected to the needle core 2;

[0110] When the needle withdrawal key 6 moves axially toward the proximal end, it pushes the needle withdrawal rod 3 to move axially toward the proximal end, and drives the needle core 2 to move axially toward the proximal end, until the proximal surface 803 of the blocking member 8 abuts against the proximal surface 703 of the tail cap inner core 7, blocking the needle core 2 from continuing to move toward the proximal end, so that the needle withdrawal rod 3 pushes the blood collection needle 12 out of the needle seat 213.

[0111] Specifically, Fig.44 When the proximal surface 803 of the blocking member 8 contacts the surface 703 of the inner core 7 of the tail cap, the needle core 2 stops moving toward the proximal end, while the needle withdrawal rod 3 continues to move toward the proximal end relative to the needle core 2, and the needle withdrawal rod 3 withdraws the blood collection needle 12 from the needle seat 213, and the blood collection needle 12 falls off.

[0112] The above-mentioned embodiment of "a launch unit 504 is provided on the tail cap elastic wall 501" can be combined with the embodiment of "a needle withdrawal key 6 is provided on the tail cap elastic wall 501", that is, the lancing pen comprises: a tail cap 5 and a needle withdrawal key 6, the tail cap 5 comprises a tail cap elastic wall 501 extending along the axial direction of the lancing pen, wherein: the tail cap elastic wall 501 is provided with a launch unit 504, and when the tail cap elastic wall 501 is pressed, the launch unit 504 is suitable for triggering the blood drawing action of the lancing pen; the needle withdrawal key 6 is slidably provided on the tail cap elastic wall 501 in the axial direction of the lancing pen, and based on the predetermined sliding of the needle withdrawal key 6 in the axial direction, the needle withdrawal action of the lancing pen is triggered.

[0113] In this embodiment, the functions of launching and withdrawing the needle are realized by the tail cap spring wall, which reduces the number of components and simplifies the structure.

[0114] In an exemplary embodiment of the present invention, the lancing device further includes: a pen cap 1 and a shell 4. Figure 17-19 FIG. 1 is a schematic structural diagram of a pen cap 1 in an exemplary embodiment of the present invention. Fig.17 As shown, the pen cap 1 is provided with a pen cap hole 104 suitable for inserting the blood collection needle 12. Figure 7 As shown, the inner wall of the housing 4 is provided with a first limiting portion 409. Figure 1 As shown, the needle core 2 includes a needle seat 213 and a first elastic arm 212 , and the needle seat 213 is suitable for holding the blood collection needle 12 inserted from the pen cap hole 104 .

[0115] like Fig. 20 As shown, when the needle withdrawal rod 3 is in the needle withdrawal position, it drives the first elastic arm 212 to be in the first radial position. The first elastic arm 212 is suitable for abutting against the first limiting portion 409 in the first radial position to prevent the needle core 2 from moving toward the distal end to the ready-to-fire state. Fig.21 As shown, when the needle withdrawal rod 3 is located at the needle loading position, it drives the first elastic arm 212 to be located at the second radial position; the first elastic arm 212 is also suitable for disengaging from the first limiting portion 409 at the second radial position.

[0116] If the blood collection needle is not installed in the needle holder, or the blood collection needle is not completely removed when the needle is withdrawn, the tail cap is pulled again to load and fire, and the needle core will push the blood collection needle to move toward the proximal end. Since the blood collection needle is not fixed to the needle holder, it will fly out of the pen cap hole 104 and cause harm to personnel.

[0117] When the present embodiment is applied, when the blood collection needle 12 is not installed in the needle seat 213 or the blood collection needle is not completely detached when withdrawing the needle, the needle withdrawal rod 3 is located at the needle withdrawal position. At this time, the needle withdrawal rod 3 drives the first elastic arm 212 to be located at the first radial position, and the first elastic arm 212 abuts the first limiting portion 409, which can prevent the needle core 2 from moving toward the distal end to the state to be fired. In other words, when the blood collection needle is not installed in place, the needle core cannot be loaded, thereby improving the safety of use. When the blood collection needle 12 is installed in the needle seat 213, the needle withdrawal rod 3 is located at the needle loading position. At this time, the needle withdrawal rod 3 drives the first elastic arm 212 to be located at the second radial position, and the first elastic arm 212 is separated from the first limiting portion 409. In other words, the needle core can be loaded only after the blood collection needle is installed in place, which improves safety and does not affect normal use.

[0118] In an exemplary embodiment of the present invention, Figure 5 As shown, the needle withdrawal rod 3 includes a first extrusion portion 303; Fig. 20As shown, the first squeezing portion 303 is suitable for squeezing the first elastic arm 212 to deform in a direction away from the axis of the lancing device when the needle withdrawal rod 3 is in the needle withdrawal position, so that the first elastic arm 212 reaches the first radial position; Fig.21 As shown, the first squeezing portion 303 is also suitable for squeezing the first elastic arm 212 to deform toward the axial direction close to the lancing device when the needle withdrawal rod 3 is located at the needle loading position, so that the first elastic arm 212 reaches the second radial position.

[0119] For example, the first extrusion portion 303 may be a convex structure, for example, Figure 5 The first extrusion portion 303 shown in the figure is a columnar protrusion, which is only an example and does not limit the specific structure of the first extrusion portion 303. For example, it can also be a plate-like structure, a step structure or other structures.

[0120] Alternatively, in other exemplary embodiments of the present invention, the first elastic arm 212 is located at the second radial position in a natural state, or in other words, the first elastic arm 212 does not abut against the first limiting portion 409 in a natural state, and during the process of the needle withdrawal rod 3 moving toward the proximal end to the needle withdrawal position, the needle withdrawal rod 3 squeezes the first elastic arm 212, so that the first elastic arm 212 reaches the first radial position and abuts against the first limiting portion 409, and during the process of the needle withdrawal rod 3 moving toward the distal end to the needle loading position, the needle withdrawal rod 3 no longer squeezes the first elastic arm 212, so that the first elastic arm 212 returns to the second radial position.

[0121] In an exemplary embodiment of the present invention, Figure 1 As shown, the needle core 2 further includes a connecting plate 220, which is connected to the first elastic arm 212 and is disposed on one side of the first elastic arm 212 close to the axial direction of the blood collection device;

[0122] The connecting plate 220 is provided with a first guide structure 207, and the first extrusion portion 303 is adapted to move in the first guide structure 207 to squeeze the first elastic arm 212 to deform in a direction away from or close to the axis of the lancing device.

[0123] For example, if Figure 1 As shown, the first guide structure 207 may be a guide groove, or the first guide structure 207 may also be a guide rib, a guide rail or other structures, and the specific structure of the first guide structure 207 is not limited.

[0124] like Fig.11aAs shown, the first squeezing portion 303 moves in the first guide structure 207, and the moving trajectory of the first squeezing portion 303 is parallel or approximately parallel to the axial direction of the lancing pen. Therefore, when the first squeezing portion 303 moves from the bottom to the top of the first guide structure 207, a leftward force is generated on the first elastic arm 212, that is, the first elastic arm 212 is squeezed and deformed toward the axial direction of the lancing pen. When the first squeezing portion 303 moves from the top to the bottom of the first guide structure 207, a rightward force is generated on the first elastic arm 212, that is, the first elastic arm 212 is squeezed and deformed toward the axial direction away from the lancing pen.

[0125] In an exemplary embodiment of the present invention, Fig. 22 As shown, the first guide structure 207 includes a first groove body 20710, a second groove body 20720 and a third groove body 20730. The distance between the first groove body 20710 and the lancing device in the axial direction is greater than the distance between the third groove body 20730 and the lancing device in the axial direction. The second groove body 20720 is disposed between the first groove body 20710 and the third groove body 20730.

[0126] Combination Fig. 22 As shown, when the first extrusion portion 303 is located in the first part of the groove 20710, the first elastic arm 212 is squeezed to deform toward the axis direction of the blood collection device. Fig.21 As shown, when the first squeezing portion 303 is located in the third portion of the groove 20730, the first elastic arm 212 is squeezed to deform in a direction away from the axis of the lancing device.

[0127] Fig. 22 When the first extrusion portion 303 is located in the first partial groove body 20710, the first extrusion portion 303 contacts at least a portion of the two surfaces 2071 and 2073 in the first partial groove body 20710; when the first extrusion portion 303 is located in the third partial groove body 20730, the first extrusion portion 303 contacts at least a portion of the two surfaces 2072 and 2074 in the third partial groove body 20730.

[0128] Alternatively, in other exemplary embodiments of the present invention, the connecting plate 220 may be omitted, and a matching structure is provided between the first elastic arm 212 and the first extrusion portion 303, so that the first extrusion portion 303 can squeeze the first elastic arm 212 to deform in a direction away from or close to the axis of the lancing pen.

[0129] In an exemplary embodiment of the present invention, Figure 1 As shown, the needle core 2 is provided with a core hole 206; Figure 4 As shown, a first protrusion 301 is provided on the needle withdrawal rod 3 ; the first protrusion 301 is suitable for being inserted into the core hole 206 .

[0130] In this embodiment, the needle withdrawal rod 3 is arranged on the needle core 2. The cooperation between the needle core 2 and the needle withdrawal rod 3 can be as follows: Fig.27a and Figure 27b As shown, the embodiment of the present invention does not limit the specific positional relationship between the needle withdrawal rod 3 and the needle core 2.

[0131] In an exemplary embodiment of the present invention, Figure 1 As shown, the needle core 2 further includes a second elastic arm 210, and the second elastic arm 210 is closer to the distal end side than the first elastic arm 212;

[0132] like Figure 7 As shown, the inner wall of the housing 4 is further provided with a second limiting portion 408, and the second limiting portion 408 is closer to the distal end than the first limiting portion 409;

[0133] like Fig. 20 As shown, when the needle core 2 is in a non-fired state and not loaded, the second elastic arm 210 abuts against the second limiting portion 408, as shown in FIG. Fig.11a As shown, when the needle core 2 moves toward the distal end to the ready-to-fire state, the second elastic arm 210 is separated from the second limiting portion 408 .

[0134] Assuming that the blood collection needle 12 is inserted from the pen cap hole 104, the second elastic arm 210 abuts against the second limiting portion 408, preventing the needle core 2 from moving distally along the axial direction of the blood collection pen; the blood collection needle 12 pushes the needle withdrawal rod 3 to move distally relative to the needle core 2 until the blood collection needle and the needle seat 213 of the needle core 2 are engaged and fixed. If the second elastic arm 210 and the second limiting portion 408 are omitted, when the blood collection needle 12 is inserted, the blood collection needle 12 pushes the needle withdrawal rod 3 to move distally, and also pushes the needle core 2 to move distally, so that the moving distance of the blood collection needle or the distance the blood collection needle is pushed will become larger. Therefore, the application of this embodiment can shorten the moving distance of the blood collection needle.

[0135] An exemplary embodiment of the present invention provides a blood collection device, comprising: a housing 4, a tail cap 5, a tail cap inner core 7 and a tail cap rotor 9. The tail cap 5 is arranged at the distal end of the housing 4. At least a part of the tail cap inner core 7 is arranged inside the tail cap 5. Figure 23-24 The figure is a schematic diagram of the structure of the tail cap rotor 9 in an exemplary embodiment of the present invention, wherein the tail cap rotor 9 is disposed at the distal end of the tail cap 5 and is adapted to rotate relative to the tail cap 5. The rotation of the tail cap rotor 9 is adapted to drive the tail cap inner core 7 to move axially to adjust the puncture depth of the blood collection needle.

[0136] In this embodiment, the insertion depth of the blood collection needle is adjusted by rotating the tail cap rotor. Compared with adjusting the insertion depth of the blood collection needle by the pen cap, this embodiment can improve the safety of operation. For example, if the solution of adjusting the insertion depth of the blood collection needle by the pen cap is adopted, the user usually points the side of the needle out to himself in the process of rotating the pen cap for easy viewing, so the safety of operation is poor. If this embodiment is adopted, the user will turn the side of the needle out to the back of himself in the process of rotating the tail cap rotor for easy viewing, so the safety of operation is improved.

[0137] In an exemplary embodiment of the present invention, Fig.14 As shown, a second protrusion 506 is provided on the inner wall of the tail cap 5. Fig.15 As shown, a spiral second guide structure 701 is provided on the outer wall of the tail cap inner core 7, and the second protrusion 506 is suitable for cooperating with the second guide structure 701, so that the tail cap inner core 7 rotates relative to the tail cap 5 and generates axial displacement at the same time.

[0138] For example, if Fig.15 As shown, the second guide structure 701 may be a guide groove, or the second guide structure 701 may also be a guide rib, a guide rail or other structures, and the specific structure of the second guide structure 701 is not limited.

[0139] Alternatively, in other exemplary embodiments of the present invention, the tail cap 5 and the tail cap inner core 7 may also adopt other matching structures so that the tail cap inner core 7 can produce axial displacement while rotating relative to the tail cap 5. The embodiments of the present invention do not limit the matching structure of the tail cap 5 and the tail cap inner core 7.

[0140] In an exemplary embodiment of the present invention, Fig.16 As shown, a first matching portion 704 is provided on the outer wall of the tail cap inner core 7. Fig.24 As shown, a second matching portion 903 is provided on the inner wall of the tail cap rotor 9, and the first matching portion 704 matches with the second matching portion 903, so that the tail cap rotor 9 drives the tail cap inner core 7 to rotate together.

[0141] Fig.16 The first matching portion 704 shown in the figure is an ear-hanging matching portion, which includes two symmetrically arranged parts. Each part includes two oppositely arranged side walls, and the gap between the two side walls is suitable for accommodating the second matching portion 903. Fig.24 The second matching portion 903 shown includes two symmetrically arranged ribs, each of which is inserted between two side walls of the first matching portion.

[0142] Fig.16 and Fig.24This is only an example, and does not limit the specific structure of the first matching portion 704 and the second matching portion 903. For example, the first matching portion 704 may include multiple parts arranged along the circumference of the tail cap inner core 7, each part includes two oppositely arranged side walls, and correspondingly, the second matching portion 903 may include multiple ribs arranged along the circumference of the tail cap rotor 9, each rib is inserted into the gap between the two side walls. For another example, the first matching portion 704 may also include only two oppositely arranged side walls, and the second matching portion 903 may also include only one rib, which is inserted into the gap between the two side walls.

[0143] In an exemplary embodiment of the present invention, Fig.25 As shown, the blood collection pen also includes a needle core 2, which is arranged inside the housing 4 and extends to the inside of the tail cap inner core 7;

[0144] A blocking member 8 and a first elastic member 11 are provided inside the tail cap inner core 7. Under the action of the tail cap inner core 7 and the first elastic member 11, the blocking member 8 drives the needle core 2 to perform axial movement within a preset range.

[0145] For example, the blocking member 8 may be a blocking plate, and the first elastic member 11 may be a spring. The specific types of the blocking member 8 and the first elastic member 11 are not limited. Fig.25 In the embodiment, the hook-shaped structure 209 ( Figure 1 The hook structure 209 is shown in the figure, which abuts against the distal surface of the blocking member 8. In this way, during the loading process, after the blood collection needle is inserted, the tail cap 5 is pulled toward the distal end, driving the tail cap inner core 7 to move toward the distal end. The proximal surface of the tail cap inner core 7 abuts against the first elastic member 11, the first elastic member 11 abuts against the blocking member 8, the proximal surface of the tail cap inner core 7 abuts against the blocking portion 8, and the blocking member 8 abuts against the hook structure 209 at the tail of the needle core 2, which will drive the needle core 2 to move toward the distal end.

[0146] The tail cap rotor 9 is rotated to rotate the tail cap inner core 7 to the nearest end relative to the pen cap 1. When the blocking member 8 moves to the point where the proximal end surface 803 of the blocking member 8 contacts the surface 703 of the tail cap inner core 7, the needle tip of the blood collection needle 12 is exposed to the longest distance from the pen cap end surface 106, and the skin is penetrated to the deepest depth; the tail cap rotor 9 is rotated to rotate the tail cap inner core 7 to the farthest end relative to the pen cap 1. When the blocking member 8 moves to the point where the proximal end surface 803 of the blocking member 8 contacts the surface 703 of the tail cap inner core 7, the needle tip of the blood collection needle is exposed to the shortest distance from the pen cap end surface 106, and the skin is penetrated to the shallowest depth. In this way, the puncture depth of the blood collection needle is adjusted.

[0147] A specific implementation method is described below. Fig.26As shown, the blood collection pen comprises: a pen cap 1, a needle core 2, a needle withdrawal rod 3, a second elastic member 10, a housing 4, a tail cap 5, a needle withdrawal key 6, a tail cap inner core 7, a first elastic member 11, a blocking member 8, and a tail cap rotor 9, and a blood collection needle 12 is loaded from the pen cap. The second elastic member 10 can be a launching spring, and the first elastic member 11 can be a reset spring.

[0148] The pen cap 1 is located on the side of the housing 4 facing the proximal end. The distal end surface 101 of the pen cap 1 contacts the proximal end surface 401 of the housing 4, the side wall surface 102 of the pen cap 1 contacts the side wall surface 402 of the housing 4, and the relative positions of the pen cap 1 and the housing 4 are fixed; the needle core 2 is located inside the pen cap 1 and the housing 4, the elongated structure 201 of the needle core 2 passes through the hole 403 in the housing, the base structure 202 of the needle core 2 is located in the cavity 103 of the pen cap 1, the convex rib 203 of the needle core 2 matches the groove 406 of the housing 4, each groove 406 includes two oppositely arranged side walls, each convex rib 203 is respectively inserted into the gap between a pair of side walls, the fourth elastic arm 204 of the needle core 2 and the surface 404 of the housing 4 are on the same side (circumferentially), and the needle core 2 can make axial movement relative to the housing 4.

[0149] A second elastic member 10 is disposed between the blocking portion 205 disposed on the needle core 2 and a surface 405 of the housing 4 , and the second elastic member 10 is sleeved on the needle core 2 .

[0150] A needle withdrawal rod 3 is also provided on the needle core 2. The cooperation between the needle core 2 and the needle withdrawal rod 3 can be as follows: Fig.27a and Figure 27b As shown, the first protrusion 301 on the needle withdrawal rod 3 passes through the core hole 206 on the needle core, and the first extrusion portion 303 on the needle withdrawal rod 3 moves in the first guide structure 207 on the needle core 2. The needle withdrawal rod 3 can move axially relative to the needle core 2, and can move distally until the first extrusion portion 303 contacts the surface 2071 in the first guide structure 207, and move proximally until the first extrusion portion 303 contacts the surface 2074 in the first guide structure 207. At this time, the surface 304 in the needle withdrawal rod 3 contacts the surface 208 in the needle core.

[0151] The tail cap 5 is arranged in a cavity on the side of the outer shell 4 facing the distal end. The mounting groove 502 on the tail cap 5 cooperates with the mounting rib 407 on the inner wall of the outer shell 4. The tail cap elastic arm 501 and the surface 404 of the outer shell 4 are on the same side (circumferentially), so that the tail cap 5 can move axially relative to the outer shell 4.

[0152] A needle withdrawal key 6 is provided on the tail cap elastic arm 501. The hole 601 on the needle withdrawal key 6 passes through the tail cap elastic arm 501, and the needle withdrawal key 6 can move axially relative to the tail cap elastic arm 501. The needle withdrawal key 6 can move distally until the surface 602 of the needle withdrawal key 6 contacts the surface 503 of the tail cap, and can move proximally until the surface 603 of the needle withdrawal key 6 contacts the surface 505 of the tail cap.

[0153] At least a part of the tail cap inner core 7 is arranged inside the tail cap 5, a second protrusion 506 is arranged on the inner wall of the tail cap 5, and a second spiral guide structure 701 is arranged on the outer wall of the tail cap inner core 7. The second protrusion 506 cooperates with the second guide structure 701 to make the tail cap inner core 7 move circumferentially relative to the tail cap 5 and generate axial relative displacement with the tail cap 5. The extension structure 201 of the needle core 2 can pass through the hole 702 of the tail cap inner core 7.

[0154] A blocking member 8 is provided at the tail end, that is, the distal end, of the needle core 2 . The hook-shaped structure 209 at the distal end of the needle core 2 cooperates with the distal end surface of the blocking member 8 , so that the blocking member 8 cannot escape from the distal end of the needle core 2 .

[0155] A first elastic member 11 is disposed between the surface 703 of the tail cap inner core 7 and the blocking member 8 , and the first elastic member 11 is sleeved on the elongated structure 201 of the needle core 2 .

[0156] A tail cap rotor 9 is provided at the distal end of the tail cap 5. The protrusion 507 in the tail cap 5 cooperates with the groove 901 in the tail cap rotor 9, so that the tail cap rotor 9 can perform circumferential rotation relative to the tail cap 5, or the groove provided in the tail cap 5 cooperates with the protrusion provided in the tail cap rotor 9, so that the tail cap rotor 9 can perform circumferential rotation relative to the tail cap 5. The rib 902 in the tail cap rotor 9 cooperates with the positioning groove 508 in the tail cap 5, so that when the tail cap rotor is rotated, a scale sense can be felt accompanied by a slight click sound. The positioning grooves 508 can be distributed circumferentially in the inner wall of the tail cap 5, and the number of the positioning grooves 508 is not limited.

[0157] A first matching portion 704 is provided on the outer wall of the tail cap inner core 7, and a second matching portion 903 is provided on the inner wall of the tail cap rotor 9. The first matching portion 704 matches with the second matching portion 903, so that the tail cap rotor 9 drives the tail cap inner core 7 to rotate together. In this way, when the tail cap rotor 9 performs circumferential motion relative to the tail cap 5, it can drive the tail cap inner core 7 and the tail cap 5 to perform circumferential motion and generate axial displacement.

[0158] The following describes the operation process of the blood collection pen:

[0159] like Fig.28 As shown, when the lancing device is in a state where the needle is not loaded and the chamber is not loaded, under the action of the first elastic member 11, the second elastic arm 210 of the needle core 2 abuts against the second limiting portion 408, the surface 304 in the needle withdrawal rod 3 contacts the surface 208 in the needle core, and the first extrusion portion 303 in the needle withdrawal rod 3 contacts at least a portion of the two surfaces 2072 and 2074 in the third part groove 20730 in the first guide structure 207. At this time, the first extrusion portion 303 squeezes the first elastic arm 212 and abuts against the first limiting portion 409 in the inner wall of the housing 4. The needle withdrawal key 6 can be located at any position between the surface 503 of the tail cap and the surface 305 of the needle withdrawal rod 3.

[0160] Insert the blood collection needle 12 through the pen cap hole 104. Fig.29 and 30 As shown, since the second elastic arm 210 abuts against the second limiting portion 408, the needle core 2 is prevented from moving toward the distal end; the blood collection needle 12 pushes the needle withdrawal rod 3 to move toward the distal end relative to the needle core 2 until the blood collection needle and the needle seat 213 of the needle core 2 are engaged and fixed, and at the same time, the needle withdrawal rod 3 is pushed into the first part of the groove 20710 of the first extrusion portion 303 and the first guide structure 207. At this time, the first extrusion portion 303 contacts at least a part of the surface 2073 or 2071 of the first guide structure 207, and the first extrusion portion 303 squeezes the first elastic arm 212 to deform toward the axial direction close to the lancing pen.

[0161] After the blood collection needle 12 is installed, the needle cap can be twisted off. Fig.31 shown.

[0162] Then you can perform the loading action:

[0163] like Figure 32-34 As shown, the tail cap 5 is pulled backward until the surface 509 in the tail cap 5 contacts the third elastic arm 214 of the needle core. The surface 509 in the tail cap 5 pushes the third elastic arm 214 to deform, so that the second elastic arm 210 is disengaged from the second limiting portion 408. At this time, the needle core 2 can move distally relative to the housing 4.

[0164] like Figure 35-37 As shown, the tail cap 5 is continuously pulled backward until a boss end face 215 of the needle core contacts a surface 405 of the housing 4. The tail cap 5 is released, and at this time, the end face 216 of the fourth elastic arm 204 of the needle core 2 is engaged with the abutment portion 105 of the pen cap 1, as shown in FIG. Fig.11a As shown. The tail cap 5 returns to the normal state under the action of the first elastic member 11. At this time, the second elastic member 10 is compressed and acts on the blocking portion 205 of the needle core 2. Fig.37 As shown, under the action of the first elastic member 11, a surface 510 of the tail cap 5 contacts a surface 411 of the housing 4. The lancing device is now in a loaded state ready for firing.

[0165] During the movement of the needle core 2 toward the distal end relative to the housing 4, the needle withdrawal rod 3 is relatively fixed to the needle core 2, so the needle withdrawal rod 3 also moves toward the distal end relative to the housing 4; during the movement, one surface 302 of the needle withdrawal rod 3 contacts the second extrusion portion 410 of the housing, and under the action of the second extrusion portion 410, the surface 302 of the needle withdrawal rod is deformed inwardly. Inwardly can be understood as toward the direction close to the axis of the lancing pen.

[0166] Combination Fig.11a and Fig.38As shown, when the end surface 216 of the fourth elastic arm 204 of the needle core 2 is engaged with the abutting portion 105 of the pen cap 1 , an elastic arm surface 307 of the needle withdrawal rod 3 abuts against the blocking portion 205 of the needle core 2 .

[0167] Then you can execute the emission action:

[0168] exist Fig.35 In the case shown in FIG. 1 , the elastic member 501 of the tail cap is pressed, and the emitting portion 504 on the tail cap 501 pushes the buckle end surface 217 of the needle core 2 inwardly, so that the fourth elastic arm 204 of the needle core 2 is bent inwardly and deformed, and the end surface 216 of the fourth elastic arm 204 of the needle core 2 is no longer engaged with the abutting portion 105 of the pen cap. The needle core 2 moves axially toward the proximal end under the force of the second elastic member, and when the proximal end surface 803 of the blocking member 8 contacts the surface 703 of the tail cap inner core 7, the needle core 2 stops moving toward the proximal end, as shown in FIG. Fig.39 As shown; at this time, Fig.40 As shown in the figure, the blood collection needle 12 moves to the farthest end relative to the pen cap 1, and the needle tip is exposed to the longest distance from the pen cap 1. Then, under the action of the first elastic member 11, the needle core 2 returns to the Fig.41 Status shown.

[0169] Needle withdrawal action:

[0170] After blood collection is completed, prepare to withdraw the needle. Before withdrawing the needle, you can first insert the needle tip into the needle cap. Fig.42 As shown, in this way, the operation safety can be improved. For example, after the blood collection needle falls off, the exposed needle tip may cause accidental injury to personnel. If the needle tip is inserted into the needle cap, the accidental injury to personnel is reduced. Inserting the needle tip into the needle cap is not a necessary operation and does not affect the withdrawal of the needle.

[0171] like Fig.43 As shown, the needle withdrawal key 6 is pushed to make the needle withdrawal key 6 move axially toward the proximal end relative to the tail cap 5 and the housing 4. When the needle withdrawal key 6 is pushed toward the proximal end, an end face 603 of the needle withdrawal key 6 pushes the surface 305 of the needle withdrawal rod, so that the needle withdrawal rod 3 moves axially toward the proximal end, and the end face 306 of the first protrusion 301 of the needle withdrawal rod 3 contacts the end face of the tail of the blood collection needle 12. Since the clamping force between the blood collection needle 12 and the needle seat 214 is greater than the force between the first elastic member 11 and the needle core 2, the blood collection needle 12 and the needle core 2 are in a relatively fixed state, so the needle withdrawal rod 3 simultaneously drives the blood collection needle 12 and the needle core 2 to move toward the proximal end.

[0172] like Fig.44 As shown, when the needle core 2 moves proximally until the proximal surface 803 of the blocking member 8 contacts the surface 703 of the tail cap inner core 7, the needle core 2 stops moving proximally.

[0173] Then the needle retraction key 6 continues to push the needle retraction rod 3 to move toward the proximal end, and the end surface 306 of the first protrusion 301 of the needle retraction rod 3 pushes the tail end surface of the blood collection needle 12, so that the needle retraction rod 3 and the needle core 2 are relatively displaced. When the needle retraction rod 3 and the needle core 2 move relative to each other, the needle retraction rod 3 withdraws the blood collection needle 12 from the needle seat 213, and the blood collection needle 12 falls off. Fig.45 As shown. Fig.46 As shown, the needle withdrawal rod 3 moves relative to the needle core 2 to the nearest end of the needle core 2, and the first elastic arm 212 remains in an outwardly deformed state.

[0174] After the needle retraction key 6 returns to its original position, the blood collection device returns to the original position. Fig.28 Status shown.

[0175] In this embodiment, the second elastic arm 210 and related structures can be omitted. Fig.47 shown.

[0176] Assuming that the blood collection needle 12 is inserted from the pen cap hole 104, the second elastic arm 210 abuts against the second limiting portion 408, preventing the needle core 2 from moving distally along the axial direction of the blood collection pen; the blood collection needle 12 pushes the needle withdrawal rod 3 to move distally relative to the needle core 2 until the blood collection needle and the needle seat 213 of the needle core 2 are engaged and fixed. If the second elastic arm 210 and the second limiting portion 408 are omitted, when the blood collection needle 12 is inserted, the blood collection needle 12 pushes the needle withdrawal rod 3 to move distally, and also pushes the needle core 2 to move distally, so that the moving distance of the blood collection needle or the distance the blood collection needle is pushed will be increased.

[0177] The second elastic arm 210 and related structures are used to prevent the needle core 2 from moving distally relative to the housing 4 when the blood collection needle is installed, so that the blood collection needle 12 is more easily engaged with the needle seat 213, and the needle core 2 is not loaded. After firing, when the needle tip of the blood collection needle is inserted into the needle cap, the needle core 2 will not move distally, making it easier to operate.

[0178] If the second elastic arm 210 and related structures are omitted, when the blood collection needle is installed, the blood collection needle 12 will push the needle core 2 to move distally relative to the housing 4 until the blood collection needle 12 is engaged with the needle seat 213. Continuing to push the blood collection needle, the needle core 2 can be moved to the loaded state.

[0179] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0180] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0181] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A blood collection pen, comprising: The needle core (2) comprises a needle seat (213) suitable for holding the blood collection needle (12); Needle withdrawal rod (3); in: The needle core (2) comprises a blocking portion (205), the needle withdrawal rod comprises an elastic portion (300), and when the blood collection needle (12) is in a state ready to be fired, the blocking portion (205) abuts against the elastic portion (300) to prevent the needle withdrawal rod (3) from triggering the needle withdrawal action of the blood collection pen.

2. The lancing device according to claim 1, further comprising: The housing (4) comprises a second extrusion portion (410); at least a portion of the needle core (2) is disposed inside the housing (4); When the needle core (2) moves toward the distal end to the ready-to-fire state, the second squeezing portion (410) squeezes the elastic portion (300) to cause deformation, so that the blocking portion (205) abuts against the elastic portion (300).

3. The lancing device according to claim 2, wherein: During the process of the needle withdrawal rod (3) moving proximally to the needle withdrawal state, the second extrusion portion (410) disengages from the elastic portion (300), and the elastic portion (300) returns to an undeformed state, so that the blocking portion (205) disengages from the elastic portion (300).

4. The lancing device according to claim 3, further comprising: The needle withdrawal key (6) is suitable for pushing the elastic part (300) to return to an undeformed state.

5. The lancing device according to claim 4, wherein: The needle withdrawal key (6) comprises a wedge-shaped portion (604), and the inclined surface of the wedge-shaped portion (604) applies a thrust away from the axial direction of the lancing pen to the elastic portion (300).

6. The lancing device according to claim 1, further comprising: The tail cap (5) comprises a tail cap elastic wall (501) extending along the axial direction of the lancing pen, Wherein: the tail cap elastic wall (501) is provided with a launch part (504), and when the tail cap elastic wall (501) is pressed, the launch part (504) is suitable for triggering the blood collection action of the blood collection pen.

7. The lancing device according to claim 6, further comprising: A second elastic member (10); The needle core (2) further comprises a fourth elastic arm (204), and an end surface (216) of the fourth elastic arm (204) is adapted to abut against an abutment portion (105) provided on the inner wall of the lancing pen when the lancing needle (12) is in a state ready to be fired; Wherein: when the tail cap elastic wall (501) is pressed, the launching part (504) pushes the fourth elastic arm (204) to disengage from the abutting part (105), so that the needle core (2) moves toward the proximal end under the drive of the second elastic member (10).

8. The lancing device according to claim 1, further comprising: A tail cap (5), comprising a tail cap elastic wall (501) extending along the axial direction of the lancing pen; The needle withdrawal key (6) is slidably arranged on the tail cap elastic wall (501) in the axial direction, and triggers the needle withdrawal action of the lancing pen based on the predetermined movement of the needle withdrawal key (6) in the axial direction.

9. The lancing device according to claim 8, further comprising: A tail cap inner core (7), at least a portion of which is disposed inside the tail cap (5); A blocking member (8) is arranged inside the tail cap inner core (7); in: When the needle withdrawal key (6) moves axially toward the proximal end, the needle withdrawal rod (3) is pushed to move axially toward the proximal end until the blocking member (8) abuts against the inner core of the tail cap (7), thereby triggering the needle withdrawal action of the lancing pen.

10. The lancing device according to claim 9, wherein: The distal end surface of the needle core (2) abuts against the distal end surface of the blocking member (8), and the needle withdrawal rod (3) is connected to the needle core (2); When the needle withdrawal key (6) moves axially toward the proximal end, it pushes the needle withdrawal rod (3) to move axially toward the proximal end, and drives the needle core (2) to move axially toward the proximal end, until the proximal end surface of the blocking member (8) abuts against the proximal end surface of the tail cap inner core (7), thereby blocking the needle core (2) from continuing to move toward the proximal end, so that the needle withdrawal rod (3) pushes the blood collection needle (12) out of the needle seat (213).

11. The lancing device according to claim 8, wherein: The tail cap elastic wall (501) is provided with a launch portion (504), and when the tail cap elastic wall (501) is pressed, the launch portion (504) is suitable for triggering the blood collection action of the blood collection pen.

12. The lancing device according to claim 1, further comprising: A pen cap (1) provided with a pen cap hole (104) suitable for inserting a blood collection needle (12); The outer shell (4) has an inner wall provided with a first limiting portion (409); in: The needle core (2) further comprises a first elastic arm (212); when the needle withdrawal rod (3) is located at the needle withdrawal position, the first elastic arm (212) is driven to be located at a first radial position; when the needle withdrawal rod (3) is located at the needle loading position, the first elastic arm (212) is driven to be located at a second radial position; The first elastic arm (212) is adapted to abut against the first limiting portion (409) in the first radial position to prevent the needle core (2) from moving toward the distal end to the ready-to-fire state, and to disengage from the first limiting portion (409) in the second radial position.

13. The lancing device according to claim 12, wherein: The needle withdrawal rod (3) comprises a first extrusion portion (303); The first squeezing portion (303) is suitable for squeezing the first elastic arm (212) to deform in a direction away from the axis of the lancing pen when the needle withdrawal rod (3) is located at the needle withdrawal position, so that the first elastic arm (212) reaches the first radial position; and squeezing the first elastic arm (212) to deform in a direction close to the axis of the lancing pen when the needle withdrawal rod (3) is located at the needle loading position, so that the first elastic arm (212) reaches the second radial position.

14. The lancing device according to claim 13, wherein: The needle core (2) further comprises a connecting plate (220), wherein the connecting plate (220) is connected to the first elastic arm (212) and is arranged on one side of the first elastic arm (212) close to the axial direction of the lancing pen; The connecting plate (220) is provided with a first guiding structure (207), and the first squeezing portion (303) is suitable for moving in the first guiding structure (207) to squeeze the first elastic arm (212) to deform in a direction away from or close to the axis of the lancing pen.

15. The lancing device according to claim 14, wherein: The first guide structure (207) comprises a first groove body (20710), a second groove body (20720) and a third groove body (20730), wherein the distance between the first groove body (20710) and the lancing device in the axial direction is greater than the distance between the third groove body (20730) and the lancing device in the axial direction, and the second groove body (20720) is arranged between the first groove body (20710) and the third groove body (20730); When the first extrusion portion (303) is located in the first part of the groove (20710), the first elastic arm (212) is squeezed to deform toward the axial direction of the blood collection pen. When the first extrusion portion (303) is located in the third part of the groove (20730), the first elastic arm (212) is squeezed to deform toward the axial direction away from the blood collection pen.

16. The lancing device according to claim 12, wherein: The needle core (2) further comprises a second elastic arm (210), wherein the second elastic arm (210) is closer to the distal end than the first elastic arm (212); The inner wall of the housing (4) is further provided with a second limiting portion (408), and the second limiting portion (408) is closer to the distal end than the first limiting portion (409); When the needle core (2) is in a non-ready-to-fire state, the second elastic arm (210) abuts against the second limiting portion (408), and when the needle core (2) moves toward the distal end to the ready-to-fire state, the second elastic arm (210) disengages from the second limiting portion (408).

17. The lancing device according to claim 1, further comprising: Housing (4); A tail cap (5) is arranged at the distal end of the housing (4); A tail cap inner core (7), at least a portion of which is disposed inside the tail cap (5); A tail cap rotor (9), arranged at the distal end of the tail cap (5) and adapted to rotate relative to the tail cap (5); The rotation of the tail cap rotor (9) is suitable for driving the tail cap inner core (7) to move axially to adjust the puncture depth of the blood collection needle (12).

18. The lancing device according to claim 17, wherein: A second protrusion (506) is provided on the inner wall of the tail cap (5), and a second spiral guide groove (701) is provided on the outer wall of the tail cap inner core (7). The second protrusion (506) is suitable for cooperating with the second guide groove (701), so that the tail cap inner core (7) generates axial displacement while rotating relative to the tail cap (5).

19. The lancing device according to claim 17, wherein: A first matching portion (704) is provided on the outer wall of the tail cap inner core (7), and a second matching portion (903) is provided on the inner wall of the tail cap rotor (9); the first matching portion (704) matches with the second matching portion (903), so that the tail cap rotor (9) drives the tail cap inner core (7) to rotate together.

20. The lancing pen according to claim 17, wherein the needle core (2) is arranged inside the housing (4) and extends to the inside of the tail cap inner core (7), wherein: A blocking member (8) and a first elastic member (11) are provided inside the tail cap inner core (7). Under the action of the tail cap inner core (7) and the first elastic member (11), the blocking member (8) drives the needle core (2) to perform axial movement within a preset range.

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