Blood collection pen

Abstract

The invention discloses a blood collection pen, comprising a pressing cap, a pen shell and a pen cap; a blood collection needle is slidably arranged in the pen cap, and a first elastic member is also installed in the blood collection pen; a driving assembly for driving the blood collection needle to move downward is arranged in the pen shell; the driving assembly comprises a rotating shaft and a shooting rod penetrating in the rotating shaft; a first partition is arranged in the pen shell, a first convex shaft is fixed at the lower end of the first partition, a torsion spring is arranged in the rotating shaft, one end of the torsion spring is connected to the first convex shaft, and the other end of the torsion spring is connected to the rotating shaft; a first spiral block is fixed on the peripheral wall of the rotating shaft, and a push plate is fixed on the pressing cap; a first spiral groove is also provided on the peripheral wall of the rotating shaft, a first protrusion is fixed on the shooting rod, and the first protrusion is embedded in the first spiral groove; a first through hole is provided on the pen shell, and an elastic protrusion or elastic arm is also provided on the rotating shaft. The shooting motion of the blood collection needle is highly accurate, avoiding problems such as deviation and secondary puncture, and alleviating or reducing the pain of the punctured person.

Description

Technical Field

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

[0002] The lancing pen is a pen-shaped blood collection device, which is used in conjunction with a disposable sterile blood collection needle to collect blood samples from the human body. The lancing pen can be reused, while the lancing needle is only for single use to avoid cross infection. Usually, the lancing pen includes a shell, a pen cap, a shooting rod, a shooting rod spring, a needle seat, a tail handle, a button, etc. The lancing needle is inserted into the needle seat of the shooting rod. When the tail handle is pulled, the shooting rod compresses the shooting rod spring to enter the firing state and align it with the blood collection site. The firing button is pressed, and the shooting rod is fired to drive the lancing needle to pierce out; due to the guide gap between the shooting rod and the shell, there is a certain jitter and offset in the movement line of the lancing needle when it is ejected, and there may also be a secondary piercing, so that the user's pain is enhanced. In addition, there is also a sleeve arrangement of the shooting rod and the needle seat. After repeated installation and removal of the blood collection device, the shooting line of the shooting rod is offset, which affects the accuracy of the puncture of the lancing needle and causes the problem of increased tingling sensation in the human body. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a lancing pen, the ejection movement of which is highly accurate, thus avoiding problems such as deviation and secondary puncture, and alleviating or reducing the pain felt by the person being punctured; in addition, the lancing pen is easy and quick to operate, the puncture depth can be adjusted in a variety of ways, and the lancing needle is easy to remove.

[0004] To achieve the above object, the present invention provides the following technical solution: a blood collection pen, comprising a pressing cap, a pen shell and a pen cap; a blood collection needle is slidably arranged in the pen cap, and a first elastic member is also installed in the blood collection pen to prompt the blood collection needle to move and reset relative to the pen cap;

[0005] A driving assembly for driving the blood collection needle to move downward is provided in the pen housing; the driving assembly includes a rotating shaft and a shooting rod inserted in the rotating shaft, and a second elastic member is provided in the shooting rod; a first partition is provided in the pen housing, a first convex shaft is fixed at the lower end of the first partition, a torsion spring is provided in the rotating shaft, one end of the torsion spring is connected to the first convex shaft, and the other end of the torsion spring is connected to the rotating shaft;

[0006] A first spiral block is fixed on the peripheral wall of the rotating shaft, and a push plate matching the first spiral block is fixed on the pressing cap, and the push plate can push the first spiral block to rotate along the first direction when it moves downward;

[0007] A first spiral groove is also formed on the peripheral wall of the rotating shaft, a first protrusion is fixed on the shooting rod, and the first protrusion is embedded in the first spiral groove; a first through hole is formed on the pen housing, and an elastic protrusion or an elastic arm is also formed on the rotating shaft;

[0008] When the rotating shaft rotates in the first direction, the torsion spring is deformed; at the same time, the first spiral groove and the first protrusion cooperate to cause the shooting rod to move upward and compress the second elastic member; when the elastic protrusion or the elastic arm rotates to the first through hole position, the elastic protrusion or the elastic arm is embedded in the first through hole to hinder the rotation of the rotating shaft;

[0009] When the elastic protrusion or the elastic arm is pressed to disengage from the first through hole, the rotating shaft rotates in the second direction under the action of the torsion spring; at the same time, the shooting rod moves downward under the action of the second elastic member and hits the blood collection needle, thereby causing the blood collection needle to move downward.

[0010] Press the pressing cap, the pressing cap moves downward and drives the push plate to move downward, the push plate drives the first spiral block to rotate, the first spiral block rotates and drives the rotating shaft to rotate, the rotating shaft rotates and compresses the torsion spring, at the same time, the first spiral groove and the first protrusion cooperate with each other to cause the shooting rod to move upward and compress the second elastic member, when the elastic protrusion or elastic arm rotates to the first through hole position, the elastic protrusion or elastic arm is embedded in the first through hole to hinder the rotation of the rotating shaft, thereby completing the energy storage process of the driving component; when blood is collected, the elastic protrusion or elastic arm is pressed to disengage from the first through hole, and the rotating shaft rotates in the second direction under the action of the torsion spring; at the same time, the shooting rod moves downward under the action of the second elastic member and hits the blood collection needle, thereby causing the blood collection needle to move downward, so that the needle tip of the blood collection needle passes through the needle outlet of the pen cap for puncture and blood collection. The operation of the blood collection pen is simple and fast, and the shooting motion line is precise.

[0011] Preferably, the blood collection needle is provided with a needle seat, and a needle seat connector is also installed on the needle seat; the outer sleeve of the needle seat is provided with a needle seat bracket, a third partition is provided in the needle seat bracket, a second through hole is provided on the third partition, and the needle seat connector passes through the second through hole and is connected to the needle seat; the needle seat connector is provided with the first elastic member, and one end of the first elastic member is connected to the needle seat connector, and the other end of the first elastic member is connected to the third partition.

[0012] Preferably, a cap seat is provided between the pen shell and the pen cap, a second protrusion is fixed on the outer peripheral wall of the needle seat bracket, a second slide groove is provided on the inner peripheral wall of the cap seat corresponding to the second protrusion, and the second protrusion is embedded in the second slide groove; a second avoidance hole is provided at the lower end of the cap seat, and the blood collection needle includes a blood collection needle body and a puncture part integrally formed with the blood collection needle body, and the size of the blood collection needle body is larger than the size of the second avoidance hole.

[0013] Preferably, when the shooting rod is in the initial position, the lower end of the shooting rod is not in contact with the upper end of the needle seat connector.

[0014] Preferably, the blood collection needle is detachably mounted on the needle holder, and the pen housing is detachably connected to the cap holder.

[0015] Preferably, the upper end of the second elastic member is connected to or abuts against the first convex shaft, and the lower end of the second elastic member is connected to or abuts against the inner wall of the shooting rod.

[0016] Preferably, a first groove is formed on the first convex shaft, a first convex ring is fixed inside the rotating shaft, a third through hole is formed on the first convex ring, one end of the torsion spring is embedded in the first groove, and the other end of the torsion spring is inserted into the third through hole.

[0017] Preferably, a plurality of first convex strips are fixed on the first convex shaft, and a first sliding groove is formed on the inner wall of the shooting rod corresponding to the first convex strips, and the first convex strips are embedded in the first sliding groove.

[0018] Preferably, a pen case nut is provided between the pen case and the pressing cap, and the pressing cap is inserted into the pen case nut; a second convex ring is fixed on the pressing cap, the pen case nut is threadedly connected to the pen case, and the second convex ring is arranged in the chamber of the pen case nut.

[0019] Preferably, a button is installed on the pen housing at the first through hole, and a fourth elastic member is installed in the button to cause it to move and reset relative to the pen housing; a fifth elastic member is also installed in the pressing cap to cause it to move and reset relative to the pen housing.

[0020] Preferably, the needle seat is further provided with a needle withdrawal sleeve, the needle seat is provided with a third sliding groove, a third protrusion is fixed in the needle withdrawal sleeve corresponding to the third sliding groove, the third protrusion passes through the third sliding groove and extends into the cavity of the needle seat, and the third protrusion extends to the top of the blood collection needle; sliding the needle withdrawal sleeve downwards can drive the blood collection needle to withdraw from the needle seat.

[0021] Preferably, a plurality of first marks are arranged on the peripheral wall of the cap seat along the circumferential direction of the cap seat, each first mark corresponds to a different puncture depth, and a second mark matching the first mark is arranged on the pen cap.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The operation of the blood collection pen is simple and quick. Through scientific and reasonable structural design, the blood collection needle can obtain higher movement acceleration under the same force condition. Since the drive component and the needle seat and the needle withdrawal sleeve are not directly set, the accuracy of the motion line of the drive component will not be affected after repeated installation and removal of the blood collection needle, thereby ensuring the puncture accuracy of the blood collection needle and reducing the pain of blood collection;

[0024] 2. The blood collection pen effectively avoids the danger of excessive puncture depth or secondary puncture by the blood collection needle, reduces accidental injuries to the user, and ensures the safety of the user.

[0025] 3. When blood collection is completed, the blood collection needle can be removed by simply operating the seventh protrusion, which effectively prevents the user from manually pulling out the blood collection needle and getting the blood on the needle contaminated, thereby reducing infections such as bacteria and viruses;

[0026] 4. The cap base and the outer side of the pen cap of the lancing pen are provided with markings corresponding to the puncture depth of the lancing needle, so that the user can make appropriate choices according to his or her own bleeding situation, effectively avoiding secondary blood drawing caused by insufficient puncture depth, and also avoiding increased pain caused by excessive puncture depth. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of the blood collection pen;

[0028] Figure 2 This is a cross-sectional view of the lancing pen;

[0029] Figure 3 Exploded view of the torsion spring, rotating shaft, and shooting rod assembly;

[0030] Figure 4 It is a schematic diagram of the structure of the pen shell;

[0031] Figure 5 is a top view of the pen case;

[0032] Figure 6 It is a bottom view of the pen case;

[0033] Figure 7 It is a structural schematic diagram of the rotating shaft;

[0034] Figure 8 It is a schematic diagram of the structure of the assembly of the pressing cap and the rotating shaft;

[0035] Fig. 9 It is a cross-sectional view of the pen housing, rotating shaft, shooting rod, needle holder bracket, needle holder and blood collection needle after assembly;

[0036] Fig.10 It is a schematic diagram of the structure after the needle holder and the blood collection needle are assembled;

[0037] Fig.11 is a schematic diagram of the structure of the shooting rod;

[0038] Fig.12 It is a cross-sectional view after the cap base and the pen cap are assembled;

[0039] Fig.13 It is a schematic diagram of the cutaway structure of the cap seat;

[0040] Fig.14 It is a schematic diagram of the three-dimensional structure of the cap base.

[0041] Figure numerals: 1, pressing cap; 2, pen shell; 3, pen cap; 4, first elastic member; 5, rotating shaft; 6, shooting rod; 7, second elastic member; 8, first partition; 9, first convex shaft; 10, torsion spring; 11, first spiral block; 12, push plate; 13, first avoidance hole; 14, first spiral groove; 15, first protrusion; 16, first through hole; 17, elastic arm; 18, needle seat; 19, needle seat connector; 20, needle seat bracket; 21, third partition; 23, needle seat connecting rod; 24, needle seat connecting head; 25, clamping protrusion; 26, third through hole; 27. Cap seat; 28. Second protrusion; 29. ​​Second slide groove; 30. Blood collection needle body; 31. Needle puncture part; 32. First groove; 33. First convex ring; 34. Fourth through hole; 35. First convex strip; 36. First slide groove; 37. Pen case nut; 38. Second convex ring; 39. Button; 40. Fourth elastic member; 41. Fifth elastic member; 42. Needle withdrawal sleeve; 43. Third slide groove; 44. Third protrusion; 45. Third convex ring; 46. Sixth elastic member; 47. Fourth convex ring; 48. First mark; 49. Second mark. DETAILED DESCRIPTION

[0042] The present invention will be further described with reference to the accompanying drawings.

[0043] This embodiment discloses a blood collection pen, such as Figures 1 to 14As shown, it comprises a pressing cap 1, a pen shell 2 and a pen cap 3, and a needle outlet is arranged at the front end of the pen cap 3; a blood collection needle is slidably arranged in the pen cap 3, and a first elastic member 4 is installed in the blood collection pen to cause the blood collection needle to move and reset relative to the pen cap 3; a driving assembly for driving the blood collection needle to move downward is arranged in the pen shell 2; the driving assembly comprises a rotating shaft 5, and a shooting rod 6 penetrating in the rotating shaft 5, and a second elastic member 7 is arranged in the shooting rod 6; a first partition plate 8 is arranged in the pen shell 2, a first convex shaft 9 is fixed to the lower end of the first partition plate 8, a torsion spring 10 is arranged in the rotating shaft 5, one end of the torsion spring 10 is connected to the first convex shaft 9, and the other end of the torsion spring 10 is connected to the rotating shaft 5; a first spiral block 11 is fixed on the peripheral wall of the rotating shaft 5, a push plate 12 matching the first spiral block 11 is fixed on the pressing cap 1, a first avoidance hole 13 is opened at the position corresponding to the push plate 12 on the first partition plate 8, the push plate 12 penetrates the first avoidance hole 13, and the push plate 12 moves downward to push the first spiral block 11 rotates along the first direction; a first spiral groove 14 is also provided on the peripheral wall of the rotating shaft 5, a first protrusion 15 is fixed on the shooting rod 6, and the first protrusion 15 is embedded in the first spiral groove 14; a first through hole 16 is provided on the pen housing 2, and an elastic protrusion or an elastic arm 17 is also installed on the rotating shaft 5; when the rotating shaft 5 rotates along the first direction, the torsion spring 10 is deformed; at the same time, the first spiral groove 14 and the first protrusion 15 cooperate with each other to cause the shooting rod 6 to move upward and compress the second elastic member 7; when the elastic protrusion or the elastic arm 17 rotates to the position of the first through hole 16, the end of the elastic protrusion or the elastic arm 17 is embedded in the first through hole 16 to hinder the rotation of the rotating shaft 5; when the end of the elastic protrusion or the elastic arm 17 is pressed to disengage from the first through hole 16, the rotating shaft 5 rotates along the second direction under the action of the torsion spring 10; at the same time, the shooting rod 6 moves downward under the action of the second elastic member 7 and hits the blood collection needle, thereby causing the blood collection needle to move downward.

[0044] The pressing cap 1 is pressed, the pressing cap 1 moves downward and drives the push plate 12 to move downward, the push plate 12 drives the first spiral block 11 to rotate, the first spiral block 11 rotates and drives the rotating shaft 5 to rotate, the rotating shaft 5 rotates and compresses the torsion spring 10, at the same time, the first spiral groove 14 and the first protrusion 15 cooperate with each other to cause the shooting rod 6 to move upward and compress the second elastic member 7, when the elastic protrusion or elastic arm 17 rotates to the position of the first through hole 16, the end of the elastic protrusion or elastic arm 17 is embedded in the first through hole 16 to hinder the rotation of the rotating shaft 5, thereby completing the energy storage process of the driving assembly; when blood is collected, the end of the elastic protrusion or elastic arm 17 is pressed to disengage it from the first through hole 16, and the rotating shaft 5 rotates in the second direction under the action of the torsion spring 10; at the same time, the shooting rod 6 moves downward under the action of the second elastic member 7 and hits the blood collection needle, thereby causing the blood collection needle to move downward, so that the needle tip of the blood collection needle passes through the needle outlet of the pen cap 3 for puncture and blood collection. The blood collection pen is easy and quick to operate, and the shooting movement line is precise.

[0045] As an implementation mode, the first direction is clockwise, and the second direction is counterclockwise. The lower end of the push plate 12 forms a first helical surface, and the upper end of the first helical block 11 forms a second helical surface matching the first helical surface.

[0046] As an embodiment, first spiral blocks 11 are fixed to opposite sides of the peripheral wall of the rotating shaft 5, and push plates 12 matching the first spiral blocks 11 are fixed to opposite sides of the pressing cap 1. First spiral grooves 14 are opened to opposite sides of the peripheral wall of the rotating shaft 5, and first protrusions 15 are fixed to opposite sides of the shooting rod 6 corresponding to the first spiral grooves 14.

[0047] In some embodiments, a needle seat 18 is sleeved on the blood collection needle, and a needle seat connector 19 is also installed on the needle seat 18; a needle seat bracket 20 is sleeved on the needle seat 18, and a third partition 21 is arranged inside the needle seat bracket 20, and a second through hole is opened on the third partition 21, and the needle seat connector 19 passes through the second through hole and is connected to the needle seat 18; a first elastic member 4 is arranged on the needle seat connector 19, and one end of the first elastic member 4 is connected to the needle seat connector 19, and the other end of the first elastic member 4 is connected to the third partition 21. In addition, the upper end of the rotating shaft is against the first partition, and the lower end of the rotating shaft is against the third partition to limit the axial movement of the rotating shaft.

[0048] The needle seat 18 is also provided with a needle withdrawal sleeve 42, and a third slide groove 43 is provided on the needle seat 18. A third protrusion 44 is fixed in the needle withdrawal sleeve 42 at a position corresponding to the third slide groove 43. The third protrusion 44 passes through the second slide groove 43 and extends into the cavity of the needle seat 18, and the third protrusion 44 extends to the top of the blood collection needle. Sliding the needle withdrawal sleeve 42 downward can drive the blood collection needle to withdraw from the needle seat 18. The needle withdrawal sleeve 42 is arranged between the needle seat 18 and the needle seat bracket 20, and a third convex ring 45 is fixed at the bottom of the needle seat 18. A sixth elastic member 46 is also provided in the needle withdrawal sleeve 42, and one end of the sixth elastic member 46 abuts against the third protrusion 44, and the other end of the sixth elastic member 46 abuts against the third convex ring 45. After the needle is withdrawn, the sixth elastic member 46 prompts the needle withdrawal sleeve 42 to reset. In addition, a fourth convex ring 47 is fixed on the peripheral wall of the needle withdrawal sleeve 42, so that it is convenient to press the needle withdrawal sleeve 42 downward. The setting of the needle withdrawal sleeve 42 makes it convenient for the user to remove the blood collection needle after blood collection, avoiding the blood on the needle tip from being contaminated by manual extraction of the blood collection needle. Since the setting position of the needle withdrawal sleeve is not directly connected to the drive component, the accuracy of the motion path of the drive component will not be affected even if the blood collection needle is removed repeatedly.

[0049] The needle seat connector 19 includes a needle seat connecting rod 23 and a needle seat connecting head 24 integrally formed with the needle seat connecting rod 23. A clamping protrusion 25 is formed on the needle seat connecting head 23. A third through hole 26 is formed at the upper end of the needle seat 18. The clamping protrusion 25 passes through the third through hole 26 and then clamps with the needle seat 18. At the same time, one end of the first elastic member 4 abuts against or connects with the needle seat connecting head 24, and the other end of the first elastic member 4 abuts against or connects with the third partition 21.

[0050] In some embodiments, a cap seat 27 is further provided between the pen housing 2 and the pen cap 3, a second protrusion 28 is fixed on the outer peripheral wall of the needle seat bracket 20, a second slide groove 29 is provided on the inner peripheral wall of the cap seat 27 corresponding to the second protrusion 28, and the second protrusion 28 is embedded in the second slide groove 29; a second avoidance hole is provided at the lower end of the cap seat 27, and the blood collection needle includes a blood collection needle body 30 and a needle puncture part 31 integrally formed with the blood collection needle body 30, and the size of the blood collection needle body 30 is larger than the size of the second avoidance hole. When blood is collected, when the lower end of the blood collection needle body 30 contacts the bottom of the cap seat 27, it stops moving downward; when the pen cap 3 is rotated, the pen cap 3 is restricted by the second slide groove 29 to rotate, and at the same time moves axially along the cap seat 27, and the axial movement distance of the pen cap 3 is equal to the puncture depth of the blood collection needle. In this way, it can be used to adjust the puncture depth of the blood collection needle.

[0051] Preferably, a plurality of first marks 48 are arranged on the peripheral wall of the cap seat 27 along the circumferential direction of the cap seat 27, each first mark 48 corresponds to a different puncture depth, and a second mark 49 matching the first mark 48 is arranged on the pen cap 3. The first mark 48 is in the form of a scale line, and the second mark 49 is in the form of an arrow. The first mark 48 and the second mark 49 cooperate with each other to indicate the puncture depth of the blood collection needle, so as to intuitively understand the insertion depth of the blood collection needle and make a suitable choice according to the user's own bleeding situation; in addition, the first mark and the second mark can also be in the form of numbers, scale lines, dots, or a combination of the above forms; the outer surface of the pen cap is provided with a plurality of grooves arranged at intervals along the axial direction, which can avoid slipping when the pen cap is rotated manually, and the rotation process is more labor-saving.

[0052] Preferably, when the shooting rod 6 is in the initial position, the lower end of the shooting rod 6 does not contact the upper end of the needle seat connector 19. Since the shooting rod 6 does not contact the needle seat connector 19, the accuracy of the driving component ejection motion path will not be affected after repeated installation and removal of the blood collection needle, thereby ensuring the puncture accuracy of the blood collection needle and reducing the pain of blood collection.

[0053] In some embodiments, the blood collection needle is detachably mounted on the needle seat 18. Specifically, the needle seat 18 is provided with a receiving cavity, the lower end of which forms an opening, through which the blood collection needle is inserted into the receiving cavity, and the blood collection needle is interference-connected with the receiving cavity. In addition, the pen housing 2 is detachably connected to the cap seat 27, wherein the detachable connection includes a snap connection or a threaded connection. In this way, it is easy to remove the blood collection needle.

[0054] In some embodiments, the upper end of the second elastic member 7 is connected to or abuts against the first convex shaft 9, and the lower end of the second elastic member 7 is connected to or abuts against the inner wall of the shooting rod 6. Preferably, a first groove 32 is provided on the first convex shaft 9, a first convex ring 33 is fixed inside the rotating shaft 5, a fourth through hole 34 is provided on the first convex ring 33, one end of the torsion spring 10 is embedded in the first groove 32, and the other end of the torsion spring 10 is inserted into the fourth through hole 34. Further, in some embodiments, a plurality of first convex strips 35 are also fixed on the first convex shaft 9, a first slide groove 36 is provided on the inner wall of the shooting rod 6 corresponding to the first convex strips 35, and the first convex strips 35 are embedded in the first slide groove 36. In this way, the moving direction of the shooting rod 6 is limited to the axial direction.

[0055] In some embodiments, a pen case nut 37 is further provided between the pen case 2 and the pressing cap 1, and the pressing cap 1 is inserted into the pen case nut 37; a second convex ring 38 is fixed to the pressing cap 1, the pen case nut 37 is threadedly connected to the pen case 2, and the second convex ring 38 is arranged in the chamber of the pen case nut 37. In this way, the pressing cap 1 is prevented from being separated from the pen case 2.

[0056] In some embodiments, a button 39 is installed on the pen housing 2 at the position of the first through hole 16, and a fourth elastic member 40 is also installed in the button 39 to prompt it to move and reset relative to the pen housing 2, so that the button 39 can be reset in time after being pressed; a fifth elastic member 41 is also installed in the pressing cap 1 to prompt it to move and reset relative to the pen housing 2, so that the pressing cap 1 can be reset in time after being pressed.

[0057] The first elastic member 4 , the second elastic member 7 , the third elastic member, the fourth elastic member 40 , the fifth elastic member 41 and the sixth elastic member 46 may be springs or other elastic members.

[0058] In summary, the blood collection needle has the following beneficial effects:

[0059] 1. The operation of the blood collection pen is simple and quick. Through scientific and reasonable structural design, the blood collection needle can obtain higher movement acceleration under the same force condition. Since the drive component and the needle seat 18 and the needle withdrawal sleeve are not directly set, the accuracy of the motion line of the drive component will not be affected after repeated installation and removal of the blood collection needle, thereby ensuring the puncture accuracy of the blood collection needle and reducing the pain of blood collection;

[0060] 2. The blood collection pen effectively avoids the danger of excessive puncture depth or secondary puncture by the blood collection needle, reduces accidental injuries to the user, and ensures the safety of the user.

[0061] 3. When blood collection is completed, the blood collection needle can be removed by simply operating the fourth convex ring 47, which effectively prevents the user from manually pulling out the blood collection needle and contaminating the blood on the needle tip, thereby reducing infection by bacteria, viruses, etc.;

[0062] 4. The cap base and the outer side of the pen cap of the lancing pen are provided with markings corresponding to the puncture depth of the lancing needle, so that the user can make appropriate choices according to his or her own bleeding situation, effectively avoiding secondary blood drawing caused by insufficient puncture depth, and also avoiding increased pain caused by excessive puncture depth.

[0063] In the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "upper" and "lower" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and therefore cannot be understood as limiting the present invention.

[0064] The specified directions in this specific embodiment are only for the convenience of describing the positional relationship and the coordination relationship between the components. The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiment. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A blood collection pen, comprising a pressing cap (1), a pen shell (2) and a pen cap (3); wherein: A blood collection needle is slidably arranged in the pen cap (3), and a first elastic member (4) is also installed in the blood collection pen to enable the blood collection needle to move and reset relative to the pen cap (3); A driving assembly for driving the blood collection needle to move downward is provided in the pen housing (2); the driving assembly comprises a rotating shaft (5) and a shooting rod (6) inserted in the rotating shaft (5), and a second elastic member (7) is provided in the shooting rod (6); a first partition plate (8) is provided in the pen housing (2), a first convex shaft (9) is fixed at the lower end of the first partition plate (8), a torsion spring (10) is provided in the rotating shaft (5), one end of the torsion spring (10) is connected to the first convex shaft (9), and the other end of the torsion spring (10) is connected to the rotating shaft (5); A first spiral block (11) is fixed on the peripheral wall of the rotating shaft (5), and a push plate (12) matching the first spiral block (11) is fixed on the pressing cap (1), and the push plate (12) can push the first spiral block (11) to rotate along a first direction when it moves downward; A first spiral groove (14) is also provided on the peripheral wall of the rotating shaft (5); a first protrusion (15) is fixed on the shooting rod (6), and the first protrusion (15) is embedded in the first spiral groove (14); a first through hole (16) is provided on the pen housing (2), and an elastic protrusion or elastic arm (17) is also provided on the rotating shaft (5); When the rotating shaft (5) rotates in a first direction, the torsion spring (10) is deformed; at the same time, the first spiral groove (14) and the first protrusion (15) cooperate to cause the shooting rod (6) to move upward and compress the second elastic member (7); when the elastic protrusion or the elastic arm (17) rotates to the position of the first through hole (16), the elastic protrusion or the elastic arm (17) is embedded in the first through hole (16) to hinder the rotation of the rotating shaft (5); When the elastic protrusion or elastic arm (17) is pressed to disengage it from the first through hole (16), the rotating shaft (5) rotates in the second direction under the action of the torsion spring (10); at the same time, the shooting rod (6) moves downward under the action of the second elastic member (7) and hits the blood collection needle, thereby causing the blood collection needle to move downward; The blood collection needle is provided with a needle seat (18); The blood collection needle is detachably mounted on the needle seat (18); A needle seat connector (19) is also installed on the needle seat (18); a needle seat bracket (20) is provided on the outer shell of the needle seat (18), a third partition (21) is provided inside the needle seat bracket (20), a second through hole is opened on the third partition (21), the needle seat connector (19) passes through the second through hole and is connected to the needle seat (18); the first elastic member (4) is provided on the needle seat connector (19), one end of the first elastic member (4) is connected to the needle seat connector (19), and the other end of the first elastic member (4) is connected to the third partition (21); When the shooting rod (6) is in the initial position, the lower end of the shooting rod (6) is not in contact with the upper end of the needle seat connector (19).

2. The blood collection device according to claim 1, characterized in that: A cap seat (27) is further provided between the pen housing (2) and the pen cap (3); a second protrusion (28) is fixed on the outer peripheral wall of the needle seat bracket (20); a second slide groove (29) is provided on the inner peripheral wall of the cap seat (27) corresponding to the second protrusion (28); the second protrusion (28) is embedded in the second slide groove (29); a second avoidance hole is provided at the lower end of the cap seat (27); the blood collection needle comprises a blood collection needle body (30) and a puncture portion (31) integrally formed with the blood collection needle body (30); the size of the blood collection needle body (30) is larger than the size of the second avoidance hole.

3. The blood collection device according to claim 2, characterized in that: The pen housing (2) is detachably connected to the cap seat (27).

4. The blood collection device according to claim 1, characterized in that: The upper end of the second elastic member (7) is connected to or abuts against the first convex shaft (9), and the lower end of the second elastic member (7) is connected to or abuts against the inner wall of the shooting rod (6).

5. The blood collection device according to claim 1, characterized in that: A first groove (32) is formed on the first convex shaft (9), a first convex ring (33) is fixed inside the rotating shaft (5), a third through hole (26) is formed on the first convex ring (33), one end of the torsion spring (10) is embedded in the first groove (32), and the other end of the torsion spring (10) is inserted into the third through hole (26).

6. The blood collection device according to claim 5, characterized in that: A plurality of first convex strips (35) are also fixed on the first convex shaft (9), and a first sliding groove (36) is provided on the inner wall of the shooting rod (6) at a position corresponding to the first convex strips (35), and the first convex strips (35) are embedded in the first sliding groove (36).

7. The blood collection device according to claim 1, characterized in that: A pen case nut (37) is further provided between the pen case (2) and the pressing cap (1), and the pressing cap (1) is inserted into the pen case nut (37); a second convex ring (38) is fixed on the pressing cap (1), the pen case nut (37) is threadedly connected to the pen case (2), and the second convex ring (38) is arranged in a cavity of the pen case nut (37).

8. The blood collection device according to claim 1, characterized in that: A button (39) is installed on the pen housing (2) at the location of the first through hole (16), and a fourth elastic member (40) is installed in the button (39) to cause it to move and reset relative to the pen housing (2); and a fifth elastic member (41) is installed in the pressing cap (1) to cause it to move and reset relative to the pen housing (2).

9. The blood collection device according to claim 1, characterized in that: The needle seat (18) is also provided with a needle withdrawal sleeve (42), and the needle seat (18) is provided with a third slide groove (43). A third protrusion (44) is fixed in the needle withdrawal sleeve (42) at a position corresponding to the third slide groove (43). The third protrusion (44) passes through the third slide groove (43) and extends into the cavity of the needle seat (18), and the third protrusion (44) extends to the top of the blood collection needle; sliding the needle withdrawal sleeve (42) downward can drive the blood collection needle to withdraw from the needle seat (18).

10. The blood collection device according to claim 2, characterized in that: A plurality of first marks (48) are arranged on the peripheral wall of the cap seat (27) along the circumferential direction of the cap seat (27), each first mark (48) corresponds to a different puncture depth, and a second mark (49) matching the first mark (48) is arranged on the pen cap (3).

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