WO2023005749A1

WO2023005749A1 - Lancing device

Info

Publication number: WO2023005749A1
Application number: PCT/CN2022/106578
Authority: WO
Inventors: 杨建涛
Original assignee: 天津云帆医疗器械有限公司
Priority date: 2021-07-27
Filing date: 2022-07-19
Publication date: 2023-02-02

Abstract

A lancing device (1), comprising a cylinder body (11), a release key (12), an inner core (13), a needle holder (14), a blood taking needle (15) and a release spring (16). A peripheral wall of the cylinder body (11) is provided with an opening (111), and the release key (12) is fitted in the opening (111) and can move between a first position and a second position in the radial direction of the cylinder body (11), wherein at the first position, a free end of an elastic catch (141) of the needle holder (14) extends into a first opening (131) in the inner core (13) and abuts against a wall of the first opening (131), so as to stop forward movement of the needle holder (14); and at the second position, a pushing and pressing portion (121) of the release key (12) pushes and presses the elastic catch (141) inwards to make same disengage from the inner core (13), so as to allow the needle holder (14) to drive the blood taking needle (15) to be released forwards under the compression of the release spring (16). By pressing the release key (12) of the lancing device (1), the needle holder (14) can drive the blood taking needle (15) to be released forwards, such that the function of blood taking is achieved. The operation process is simple, safe and convenient.

Description

Lancet

Cross References to Related Applications

This application is based on the Chinese patent applications with application numbers 202110852965.3, 202110851383.3, 202110852973.8, 202110851373.X and the filing date is July 27, 2021, and claims the priority of the above Chinese patent applications. The entire contents of the above Chinese patent applications are hereby This article is incorporated by reference.

technical field

The disclosed field of medical blood collection instruments, in particular, relates to a blood collection pen.

Background technique

The blood collection pen is a medical blood collection device. In related technologies, the blood collection pen is suitable for use in conjunction with a disposable blood collection needle, which is equivalent to a firing device for a disposable blood collection needle and can be reused. The development of lancets has a history of many years, and the improvement of lancets has also gone through different stages, but the lancets in the related art still have problems of operation convenience and safety in use.

Contents of the invention

The embodiments of the present disclosure provide a convenient and safe blood collection pen.

The blood collection pen proposed by the embodiment of the present disclosure includes: a cylinder body and a firing key. An opening is arranged on the peripheral wall of the cylinder body. It is movable between a first position and a second position, the launch key has a pushing part extending toward the cylinder; an inner core, the inner core is arranged in the cylinder and the front end of the inner core is separated from the cylinder The front end of the inner core protrudes, and the peripheral wall of the inner core is provided with a first opening; the needle holder and the blood collection needle, the needle holder is arranged in the inner core, the needle holder is provided with elastic claws, and the blood collection needle is installed on the In the needle frame; the firing spring is arranged in the barrel and is only pressed between the barrel and the needle frame, and the firing spring is used to press the needle frame forward; wherein, In the first position, the free end of the elastic pawl protrudes into the first opening and abuts against the wall of the first opening to stop the needle holder from moving forward. position, the pushing part pushes the elastic claw inwardly to break away from the inner core, so as to allow the needle holder to drive the blood collection needle to fire forward under the pressure of the firing spring.

In some embodiments, in the first position, the needle holder is located in the inner core, and in the second position, the front end of the needle holder protrudes from the front end of the inner core.

In some embodiments, the inner core is provided with a second opening, and the second opening is located in front of the first opening, and when the needle holder is launched forward to the front limit position, the free movement of the elastic claw The end extends into the second opening and abuts against a wall of the second opening.

In some embodiments, the blood collection pen also includes a needle withdrawal spring, the needle withdrawal spring is arranged in the inner core, and the front end of the needle withdrawal spring stops against the inner core, when the needle holder is fired forward , the needle holder gradually compresses the needle withdrawal spring, and after the needle holder moves forward to the front limit position, the needle withdrawal spring pushes the needle holder to move backward so that the needle tip of the blood collection needle moves backward retract.

In some embodiments, it also includes: a protective cap, the rear end of the protective cap is detachably connected to the front end of the inner core; a needle withdrawal assembly, the needle withdrawal assembly includes a push-pull rod and a tail cap, and the tail The front end of the cap fits in the rear end of the cylinder, the push-pull rod is connected with the tail cap and extends into the needle holder from the rear end of the needle holder, and the tail cap is inside the cylinder Moveable along the front and rear directions to drive the push-pull rod to move forward, so that the push-pull rod pushes the blood collection needle forward to separate from the needle holder; the needle withdrawal protection sleeve is set in the inner On the core, the front end of the needle withdrawal protection sleeve is against the rear end of the protective cap and the rear end of the needle withdrawal protection sleeve is against the front end of the tail cap to limit the forward movement of the tail cap. After the protective cap is detached from the inner core, the needle withdrawal protective cover and the tail cap can move forward.

In some embodiments, the tail cap includes a tail cap cover and a tail cap core. end protrudes from the rear end of the barrel, the tail cap core is installed in the tail cap cover, the push-pull rod is connected with the rear end of the tail cap core and the rear end of the push-pull rod is connected from the The rear end of the tail cap core protrudes; the tail cap core includes a core sleeve and a push rod, the push rod extends forward from the core sleeve, the needle withdrawal protection sleeve has a push rod extending backward, the The rear end of the push rod is against the front end of the push rod.

In some embodiments, there are two push rods facing each other in the radial direction of the tail cap core, and there are two push rods corresponding to the push rods one by one.

In some embodiments, the rear end surface of the ejector rod and the front end surface of the push rod are inclined, and when the tail cap moves forward, the rear end surface of the ejector rod is opposite to the front end surface of the push rod. Slide to rotate the needle withdrawal protection sleeve, so that the push rod is disengaged from the ejector rod.

In some embodiments, the needle withdrawal protection cover includes a ring body and a stopper connected to the ring body and extending forward, the ejector rod is connected to the ring body and extends backward, and the inner core A flange is provided on the outer peripheral wall of the inner core, and the flange has a gap, and the gap divides the flange into multiple sections along the circumferential direction of the inner core, and the stopper part is located in the gap, and the flange The front end of the stop part and the front end of the stop part are against the rear end of the protective cap, wherein when the needle withdrawal protection sleeve moves forward a predetermined distance, the flange stops the ring body to prevent the needle withdrawal protection The set continues to move forward.

In some embodiments, at least a part of at least one side of the stop portion is an inclined plane, and when the tail cap moves forward to rotate the needle withdrawal protection sleeve, the flange slides relative to the inclined plane.

In some embodiments, the rear end of the inner core protrudes into the barrel from the front end of the barrel and the front end of the inner core protrudes from the front end of the barrel, and the protective cap is detachable It is connected with the front end of the inner core, and the rear end of the protective cap is against the front end of the barrel.

In some embodiments, the needle withdrawal assembly further includes a cap spring, the cap spring is arranged in the cylinder body and stops between the cylinder body and the cap, and the cap spring is used for Press the tail cap backwards.

In some embodiments, the outer wall of the push-pull rod is provided with a step and a groove, and the rear end surface of the end cap core is provided with a tongue, and the free end of the tongue is clamped in the groove And the elevation of the step is against the end cap core.

In some embodiments, the blood collection pen further includes a push-pull rod spring, the push-pull rod spring is sleeved on the push-pull rod, the front end of the push-pull rod spring abuts against the push-pull rod and the rear end touches the cylinder Stopping, the push-pull rod spring is used to press the push-pull rod forward.

In some embodiments, the cylinder includes a cylinder sleeve and a launch spring installation sleeve, the launch spring installation sleeve is installed in the cylinder sleeve with the opening facing forward, and the rear end of the launch spring is located at the launch spring. In the spring installation sleeve and against the rear end of the launch spring installation sleeve, the front end of the launch spring is against the needle holder, and the front end of the tail cap spring is against the rear end of the launch spring installation sleeve, so The rear end of the push-pull rod spring is located in the installation sleeve of the launch spring and abuts against the rear end of the installation sleeve of the launch spring.

In some embodiments, the push-pull rod has a front limit position, and when the push-pull rod is at the front limit position, the push-pull rod contacts the blood collection needle and the push-pull rod spring is in a free state.

In some embodiments, the front end of the push-pull rod is in contact with the rear end of the blood collection needle inside the core.

In some embodiments, the pen cap, the rear end of the pen cap is detachably connected to the front end of the inner core and abuts against the front end of the barrel; the limit cap, the limit cap is sleeved on the pen cap and an adjustment ring, the rear end of the adjustment ring is sleeved on the pen cap and the front end of the adjustment ring is sleeved on the rear end of the limit cap, and the adjustment ring is set on the pen cap The position in the circumferential direction is adjustable to drive the limiting cap to translate in the forward and backward direction, so as to adjust the length of the needle tip of the blood collection needle protruding from the front end of the limiting cap at the ejection position.

In some embodiments, the outer peripheral wall of the pen cap is provided with protrusions, and the inner peripheral wall of the adjustment ring is provided with a plurality of grooves distributed along the circumference of the adjustment ring at intervals, and the adjustment ring is relatively When the cap is rotated, the protrusion is selectively engaged in the groove.

In some embodiments, the inner peripheral wall of the adjustment ring is provided with a limit bar, and the outer peripheral wall of the pen cap is provided with a limit groove extending along the circumference of the pen cap, and the limit bar is fitted on the limit bar. The position slot is slidable along the circumferential direction of the pen cap, so as to limit the forward and backward movement of the adjustment ring relative to the pen cap.

In some embodiments, the inner peripheral wall of the adjustment ring is provided with a block, and the outer peripheral wall of the pen cap is provided with a block, and the block is opposite to the block in the circumferential direction of the pen cap. When the adjusting ring is rotated by a predetermined angle, the locking block stops against the locking platform to define the front limit position of the limiting cap.

In some embodiments, external threads are provided on the outer peripheral surface of the limiting cap, and internal threads that cooperate with the external threads are provided on the inner peripheral surface of the adjusting ring.

In some embodiments, the outer peripheral wall of the pen cap is formed with a stepped surface for abutting against the limiting cap to define a rear limit position of the limiting cap.

In some embodiments, a sliding groove is provided on the outer wall surface of the front end of the inner core, the sliding groove has a front side wall and a rear side wall extending along the circumference of the inner core, and the sliding groove has a direction toward The circumferential opening of the inner core, the inner wall surface of the pen cap is provided with a sliding block, the sliding block enters from the opening of the sliding groove and fits in the sliding groove to limit the relative movement of the pen cap The inner core moves back and forth; the outer wall surface of the front end of the inner core is provided with a limiting part, and the inner wall surface of the pen cap is provided with a limiting block, and the limiting block is in the circumferential direction of the pen cap. portion to abut against to limit the rotation of the pen cap relative to the inner core.

In some embodiments, when the limiting block abuts against the limiting portion, the sliding block abuts against the bottom of the sliding groove in the circumferential direction of the inner core, so as to limit the sliding block from breaking away from the The bottom of the groove, the rear end of the limiting block is connected to the front end of the sliding block, the limiting part is located in front of the sliding groove, and the rear end surface of the limiting part is the front side wall of the sliding groove A part of the limiting part has a first end and a second end in the circumferential direction of the inner core, the limiting block is against the first end, and the limiting part is in the radial direction of the inner core The upward thickness gradually decreases from the first end to the second end in the circumferential direction of the inner core.

In some embodiments, the outer peripheral surface of the adjustment ring is provided along the circumferential direction of the adjustment ring for indicating the position of the adjustment ring so as to be associated with the needle point of the blood collection needle protruding from the limit cap at the ejection position. scale out the length.

Description of drawings

Fig. 1 is a schematic diagram of a blood collection pen according to an embodiment of the present invention.

Fig. 2 is a front view of the blood collection pen according to the embodiment of the present invention.

Fig. 3 is a first cross-sectional view of the blood collection pen according to the embodiment of the present invention.

Fig. 4 is a second cross-sectional view of the blood collection pen according to the embodiment of the present invention.

Fig. 5 is an exploded view of a lancing device according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of a blood collection needle according to an embodiment of the present invention.

Fig. 7 is a first partial schematic diagram of a blood collection pen according to an embodiment of the present invention.

Fig. 8 is a second partial schematic diagram of the blood collection pen according to the embodiment of the present invention.

FIG. 9 is a sectional view of FIG. 8 .

Fig. 10 is a schematic diagram of a push-pull rod and a push-pull rod spring according to an embodiment of the present invention.

Fig. 11 is a third partial schematic diagram according to an embodiment of the present invention.

Fig. 12 is a partial schematic diagram 4 according to an embodiment of the present invention.

Fig. 13 is an exploded view of the protective cap of the lancing pen according to the embodiment of the present invention.

14 is a schematic diagram of an adjustment ring according to an embodiment of the present invention.

FIG. 15 is a sectional view of FIG. 14 .

Fig. 16 is a schematic diagram of a pen cap according to an embodiment of the present invention.

Fig. 17 is a schematic diagram of a pen cap and a limit cap according to an embodiment of the present invention.

Fig. 18 is a partial schematic diagram of the blood collection pen according to the fifth embodiment of the present invention.

19 is a cross-sectional view of a protective cap according to an embodiment of the present invention.

Reference signs:

1. Blood collection pen; 11. Cylinder; 111. Opening; 112. Cylinder sleeve; 113. Launching spring installation sleeve; 12. Launching key; 121. Pushing part; 13. Inner core; 131. First opening; 132. Second opening; 133. Sliding groove; 134. Limiting part; 1341. First end; 1342. Second end; 135. Flange; 136. Notch; 14. Needle holder; 141. Elastic claw; 15 , blood collection needle; 151, needle point; 16, launch spring; 171, push-pull rod; 1711, step; 1712, card slot; 172, tail cap; 1721, tail cap cover; 1722, tail cap core; , core sleeve; 1725, push rod; 173, tail cap spring; 18, push-pull rod spring; 191, pen cap; 1911, protrusion; 1912, limit slot; 1913, card platform; ;1916, limit block; 192, limit cap; 1921, external thread; 193, adjustment ring; 1931, groove; 1932, limit bar; 1933, block; 1934, internal thread; ; 210, ejector rod; 220, ring body; 230, only reach part;

Detailed ways

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

The following describes the lancing device 1 of the embodiment of the present invention according to FIGS. 1-19 . As shown in FIG. 3 , the blood collection pen 1 includes a cylinder body 11 , a firing key 12 , an inner core 13 , a needle holder 14 , a blood collection needle 15 and a firing spring 16 . An opening 111 is formed on the peripheral wall of the barrel 11 , and the firing key 12 fits in the opening 111 and is movable between a first position and a second position along the radial direction of the barrel 11 . The firing key 12 has a pushing portion 121 extending toward the inside of the barrel 11. The inner core 13 is disposed in the cylinder body 11 and the front end of the inner core 13 protrudes from the front end of the cylinder body 11 , and a first opening 131 is formed on the peripheral wall of the inner core 13 . The needle holder 14 is arranged in the inner core 13 , and the needle holder 14 is provided with elastic claws 141 , and the blood collection needle 15 is installed in the needle holder 14 . The firing spring 16 is arranged in the cylinder body 11 and stops between the cylinder body 11 and the needle frame 14 , and the firing spring 16 is used to press the needle frame 14 forward. Wherein, in the first position, the free end of the elastic claw 141 extends into the first opening 131 and abuts against the wall of the first opening 131 to stop the needle holder 14 from moving forward; in the second position, the pushing part 121 The elastic claw 141 is pushed inward to disengage from the inner core 13 to allow the needle holder 14 to drive the blood collection needle 15 to fire forward under the pressure of the firing spring 16 .

When using the blood collection device 1, press the firing key 12 inwardly along the radial direction of the cylinder body 11 to move the firing key 12 from the first position to the second position. During the movement, the pushing part 121 inside the firing key 12 The free end pushes the elastic claw 141 of the needle holder 14 inwardly through the first opening 131 provided on the inner core 13, so that the elastic claw 141 moves away from the inner core 13 from the stop position stopped by the inner core 13. The disengagement position of the block moves, and when the elastic claw 141 breaks away from the stop of the inner core 13, since the firing spring 16 presses the needle frame 14 forward, the needle frame 14 is launched forward along the axial direction of the blood collection pen 1. At the same time, the blood collection needle 15 installed in the needle holder 14 is launched forward, thereby completing the blood collection process.

According to the blood collection pen 1 according to the embodiment of the invention, by pressing the firing key 12, the needle holder 14 can drive the blood collection needle 15 to launch forward, realizing the blood collection function. The pushing part 121 of the firing key 12 pushes the elastic claw 141 on the needle holder 14 inwardly, so that the elastic claw 141 breaks away from the stop of the inner core 13, and is fired forward under the pressure of the firing spring 16. The operation process is simple and convenient. Safe and convenient.

Specific embodiments of the present invention will be described in detail below with reference to FIGS. 1-19 .

As shown in FIG. 3 , the blood collection pen 1 includes a cylinder body 11 , a firing key 12 , an inner core 13 , a needle holder 14 , a blood collection needle 15 and a firing spring 16 .

The inner core 13 is arranged in the cylinder body 11 , and the front end of the inner core 13 protrudes from the front end of the cylinder body 11 , and the inner core 13 and the cylinder body 11 are fixed to each other. The opening 111 provided on the cylinder body 11 and the first opening 131 provided by the inner core 13 are opposite in the radial direction of the cylinder body 11, the firing key 12 protrudes outward from the opening 111 of the cylinder body 11, and a part of the firing key 12 The outer peripheral wall of the cylinder body 11 protrudes outwards, which is convenient for pressing. The needle frame 14 is arranged in the inner core 13, when the needle frame 14 is not launched forward, that is, when the needle frame 14 is in the state to be launched, as shown in Figure 3, the front end of the needle frame 14 is flush with the front end of the inner core 13 or roughly even. It can be understood that, when the needle frame 14 is launched forward, the needle frame 14 slides forward relative to the inner core 13 , and the front end of the needle frame 14 protrudes from the front end of the inner core 13 . The rear end of the launching spring 16 abuts against the cylindrical body 11 , and the front end abuts against the rear end of the needle holder 14 . In the first position, that is, when the needle frame 14 is ready for firing, the firing spring 16 is in a compressed state. Optionally, the needle frame 14 and the inner core 13 are positioned at the upper limit in the circumferential direction of the inner core 13, so that the needle frame 14 can only slide relative to the inner core 13 in the front and back direction, so that the needle frame 14 and the blood collection needle 15 can be more stably launch, to prevent the needle holder 14 from rotating when launching forward, which will affect the blood collection effect.

The free end of the elastic claw 141 of the needle holder 14 is its front end. When the firing key 12 is in the first position, the free end of the elastic claw 141 extends into the first opening 131 and abuts against the front wall of the first opening 131 offset, thereby stopping the needle holder 14 from moving forward. When the free end of the elastic claw 141 is pushed inward by the pushing part 121 of the firing key 12 by pressing the firing key 12 inwardly, the free end of the elastic claw 141 will break away from the stop of the front wall of the first opening 131 , that is, the inner core 13 loses its stopper effect on the needle holder 14, and the needle holder 14 drives the blood collection needle 15 to shoot forward under the action of the firing spring 16.

As shown in FIG. 3 , the front end of the blood collection needle 15 is a needle point 151 , and the rear end of the blood collection needle 15 is loaded from the front end of the needle holder 14 . Optionally, a protrusion is provided on the inner peripheral wall of the needle holder 14, and a groove corresponding to the protrusion is provided on the outer peripheral wall of the blood collection needle 15, and the blood collection needle 15 is loaded into the front end of the needle holder 14 from front to back until the needle holder 14 The protrusion fits in the groove, and the blood collection needle 15 and the needle frame 14 are limited to each other, and the blood collection needle 15 is installed in the needle frame 14 . It should be noted that, in order to improve safety and avoid cross-infection, the blood collection needle 15 in this embodiment is a disposable product. After the blood collection needle 15 is used, it can be removed from the needle holder 14 to replace a new blood collection needle 15. Therefore, the blood collection device 1 of this embodiment can be used repeatedly, only the blood collection needle 15 needs to be replaced.

Further, as shown in FIG. 8 , a second opening 132 is also opened on the inner core 13, and the second opening 132 is located in front of the first opening 131. When the needle holder 14 is launched forward to the front limit position, the elastic claw 141 The free end extends into the second opening 132 and abuts against a wall of the second opening 132 . That is to say, the second opening 132 functions to limit the front limit position of the needle holder 14 . The front limit position of needle frame 14 is the limit position when needle frame 14 launches forward. Specifically, when the needle holder 14 is launched forward, the elastic claw 141 breaks away from the front wall of the first opening 131 and moves forward. When the free end of the elastic claw 141 is opposite to the second opening 132 in the radial direction of the inner core 13 , due to the elasticity of the elastic claw 141, its free end will protrude from the second opening 132, the needle holder 14 continues to shoot forward, and the free end of the elastic claw 141 will stop against the front wall of the second opening 132, Thereby the inner core 13 stops the needle frame 14 again, even if the firing spring 16 still presses the needle frame 14 forward at this time, the needle frame 14 no longer slides forward, and now the needle frame 14 reaches its front limit position.

As shown in FIG. 3 , the blood sampling device 1 also includes a needle withdrawal spring 21 . The needle withdrawal spring 21 is arranged in the inner core 13, the front end of the needle withdrawal spring 21 stops against the inner core 13, and the rear end of the needle withdrawal spring 21 stops against the needle holder 14, and when the needle holder 14 is launched forward, the needle holder 14 is gradually compressed Withdraw needle spring 21. After the needle frame 14 moves forward to the front limit position, the needle withdrawal spring 21 pushes the needle frame 14 to move backward so that the needle tip 151 of the blood collection needle 15 is retracted backward. That is to say, when the needle holder 14 moved forward to the limit position, the needle head of the blood collection needle 15 also reached the front limit position. Move backwards, and drive the needle point 151 of the blood collection needle 15 to move backwards, thereby avoiding the accidental injury caused by the leak of the needle of the blood collection needle 15 that has been fired. The blood collection pen 1 of the present application has the advantage of high safety.

As shown in FIG. 3 , the blood collection pen 1 also includes a needle withdrawal assembly, which includes a push-pull rod 171 , a tail cap 172 and a tail cap spring 173 . The needle withdrawing assembly is used to detach the blood collection needle 15 from the needle frame 14 so that the blood collection needle 15 can be replaced.

The front end of the tail cap 172 fits in the rear end of the cylinder body 11 , that is, the front end of the tail cap 172 extends into the cylinder body 11 from the rear end of the cylinder body 11 . The tail cap 172 is provided movably in the front-rear direction inside the cylinder body 11 . The rear end of the push-pull rod 171 is connected to the tail cap 172 , and the front end of the push-pull rod 171 extends into the needle holder 14 from the rear end of the needle holder 14 . Push the tail cap 172 forward to make it move forward, the tail cap 172 drives the push-pull rod 171 to move forward, the front end of the push-pull rod 171 moves forward relative to the needle frame 14 in the needle frame 14, and the front end of the push-pull rod 171 moves forward Push the rear end of the blood collection needle 15, and the blood collection needle 15 will be disengaged from the front end of the needle holder 14, that is, the push-pull rod 171 pushes the blood collection needle 15 forward to disengage from the needle holder 14. The tail cap spring 173 is arranged in the cylinder body 11, and the tail cap spring 173 stops between the cylinder body 11 and the tail cap 172, and the tail cap spring 173 is used to press the tail cap 172 backward. That is to say, the rear end of the tail cap spring 173 stops against the tail cap 172, and the front end of the tail cap spring 173 stops against the cylinder body 11. When the tail cap 172 moved forward, the tail cap spring 173 was compressed by the tail cap 172, and when removed The forward thrust applied on the tail cap 172 causes the tail cap 172 to move back to the initial position under the action of the tail cap spring 173 .

Specifically, as shown in FIGS. 3 and 4 , the tail cap 172 includes a tail cap cover 1721 and a tail cap core 1722 . The front end of the tail cap cover 1721 is movably fitted in the rear end of the cylinder body 11 along the front and rear direction, and the rear end of the tail cap cover 1721 protrudes from the rear end of the cylinder body 11 . The tail cap core 1722 is installed in the tail cap cover 1721, and the tail cap core 1722 and the tail cap cover 1721 are mutually limited in the front and rear direction. When the rear end of the tail cap cover 1721 is pushed forward, the tail cap cover 1721 drives the tail cap core. 1722 moved forward. The rear end of the tail cap spring 173 stops against the rear end of the tail cap core 1722, and the tail cap spring 173 pushes the tail cap core 1722 backward, and the tail cap core 1722 drives the tail cap spring 173 to move backward.

The push-pull rod 171 is connected to the rear end of the tail cap core 1722 and the rear end of the push-pull rod 171 protrudes from the rear end of the tail cap core 1722 . The outer wall surface of the push-pull rod 171 is provided with a step 1711 and a draw-in groove 1712, and the rear end surface of the tail cap core 1722 is provided with a catch 1723, and the free end of the catch 1723 is held in the draw-in groove 1712, and the facade of the step 1711 is in contact with the draw-in groove 1712. The end cap core 1722 offsets. As shown in FIG. 4 , the tab 1723 extends backward and is locked on the rear side wall of the slot 1712 to stop the push-pull rod 171 from moving forward relative to the tail cap core 1722 . As shown in FIG. 3 , the elevation of the step 1711 is located in front of the front face of the rear end of the tail cap core 1722 and abuts against it to stop the push-pull rod 171 from moving backward relative to the tail cap core 1722 . Thus, the push-pull rod 171 and the tail cap core 1722 are mutually limited in the front-rear direction. When the tail cap core 1722 moves forward under the drive of the tail cap cover 1721, the tail cap core 1722 drives the push-pull rod 171 to move forward. When the tail cap core 1722 moves backward under the action of the tail cap spring 173, the tail cap core 1722 drives the push-pull rod 171 to move backward.

Further, as shown in Fig. 3 and Fig. 10, the blood collection pen 1 also includes a push-pull rod spring 18, which is sheathed on the push-pull rod 171, and the front end of the push-pull rod spring 18 is in contact with the push-pull rod 171 and the rear end is in contact with the push-pull rod 171. The cylinder body 11 stops, and the push-pull rod spring 18 is used to press the push-pull rod 171 forward. The push-pull rod 171 moves backward under the action of the tail cap spring 173, and the push-pull rod 171 compresses the push-pull rod spring 18 gradually. When the forward force applied by the push-pull spring 18 to the push-pull rod 171 and the backward force exerted by the tail cap spring 173 on the push-pull rod 171 are mutually balanced, the push-pull rod 171 stops moving and reaches the rear limit position. By setting the push-pull rod spring 18, it is possible to prevent the tail cap 172 and the push-pull rod 171 from moving backward too much due to inertia. If the push-pull rod 171 moves backward too much, it is easy to cause the front end of the push-pull rod 171 to affect the firing of the needle holder 14 . In addition, as shown in Figure 3, when the push-pull rod 171 reaches the rear limit position, the front end of the push-pull rod 171 can contact the rear end of the blood collection needle 15, so that the needle withdrawal assembly can move the blood collection needle 15 forward more quickly when the needle is withdrawn. ejected.

The cylinder 11 includes a cylinder sleeve 112 and a launch spring installation sleeve 113, and the launch spring installation sleeve 113 is installed in the cylinder sleeve 112 with an opening facing forward. The rear end of the firing spring 16 is located in the firing spring installation sleeve 113 and is against the rear end of the firing spring installation sleeve 113 , and the front end of the firing spring 16 is against the needle holder 14 . The front end of the tail cap spring 173 is against the rear end of the launching spring installation sleeve 113 . The rear end of the push-pull rod spring 18 is located in the launch spring installation sleeve 113 and is against the rear end of the launch spring installation sleeve 113 . As an example, as shown in Figure 3, the rear end of the launch spring 16 stretches into the launch spring installation cover 113 from the front opening of the launch spring installation sleeve 113 and abuts against the rear end of the launch spring installation sleeve 113, the rear end of the launch spring 16 It is against the rear end of the needle holder 14. The rear end of the push-pull rod spring 18 stretches into the launch spring installation cover 113 from the front opening of the launch spring installation cover 113 and abuts against the rear end of the launch spring installation cover 113 . It can be understood that the firing spring 16 and the push-pull rod spring 18 do not interfere with each other, and optionally, the firing spring 16 is sheathed with the push-pull rod spring 18 . Tail cap spring 173 is positioned at the rear of launching spring installation sleeve 113, and its front end is against the rear end face of the rear end of launching spring installation sleeve 113.

As shown in FIG. 11 and FIG. 12 , the lancing device 1 further includes a needle withdrawal protection cover 20 . The needle withdrawal protection sleeve 20 is set on the inner core 13, the front end of the needle withdrawal protection sleeve 20 is offset against the rear end of the protective cap, and the rear end of the needle withdrawal protection sleeve 20 is offset against the front end of the tail cap 172 to limit the direction of the tail cap 172. Move forward, after the protective cap breaks away from the inner core 13, the needle withdrawal protective cover 20 and the tail cap 172 can move forward. The needle withdrawal protection cover 20 is used to avoid false needle withdrawal operation. When the protective cap did not break away from the inner core 13, because the front end of the needle withdrawal protection cover 20 was against the rear end of the protective cap, the rear end of the needle withdrawal protection cover 20 and the front end of the tail cap 172, so even if the tail cap 172 is applied forward Even the power of the tail cap 172 cannot be slid forward, so the push-pull rod 171 cannot push the lancet 15 forward to withdraw the needle. After the protective cap is disengaged from the inner core 13, the needle withdrawal protective cover 20 is no longer restricted by the protective cap. At this moment, applying a driving force to the tail cap 172 can make the tail cap 172 move forward, because the tail cap 172 can move forward. Moving forward, the push-pull rod 171 can push the blood collection needle 15 to complete the withdrawal of the needle.

The blood collection device 1 according to the embodiment of the present invention includes a needle withdrawal protective cover 20 that protects the needle withdrawal. When the protective cap is connected to the inner core 13, the needle withdrawal protection cap can prevent the tail cap 172 from moving forward, thereby avoiding false withdrawal. Needle accidents, therefore, the lancing device 1 of the embodiment of the present invention has the advantage of high safety.

Further, the tail cap core 1722 includes a core sleeve 1724 and a push rod 1725, the push rod 1725 extends forward from the core sleeve 1724, the needle withdrawal protection cover 20 has a push rod 210 extending backward, the rear end of the push rod 210 is connected to the push rod The front end of 1725 is offset, that is, the front end of the needle withdrawal protective cover 20 is offset against the rear end of the protective cap.

Optionally, as shown in Figures 11 and 12, there are two push rods 1725 that are opposite in the radial direction of the end cap core 1722, and there are two push rods 210 that correspond to the push rods 1725 one-to-one, so that the needle can be withdrawn The anti-resistance function between the protective sleeve 20 and the protective cap is more stable, and the structural rationality is improved.

Further, as shown in FIGS. 11 and 12 , both the rear end surface of the push rod 210 and the front end surface of the push rod 1725 are sloped. When the tail cap 172 moves forward, the rear end of the push rod 210 slides relative to the front end of the push rod 1725 to rotate the needle withdrawal protection sleeve 20 , so that the push rod 1725 is separated from the push rod 210 . That is to say, when the tail cap 172 is pushed to move forward, since the rear end surface of the push rod 210 and the front end surface of the push rod 1725 are sloped, the rear end surface of the push rod 210 will slide relative to the front end surface of the push rod 1725, resulting in The needle withdrawal protective cover 20 rotates, and the rotation of the needle withdrawal protective cover 20 can make the push rod 1725 disengage from the ejector rod 210 , that is, the needle withdrawal protective cover 20 disengages from the tail cap 172 . And the rear tail cap 172 continues to move forward, and the needle withdrawal protective cover 20 no longer moves forward due to breaking away from the tail cap 172 .

As shown in FIGS. 11 and 12 , the needle withdrawal protection sheath 20 includes a ring body 220 and a stop portion 230 connected to the ring body 220 and extending forward. The ring body 220 is sheathed on the inner core 13 . The ejector rod 210 is connected to the ring body 220 and extends backward. A flange 135 is provided on the outer peripheral wall of the inner core 13 . The flange 135 has a notch 136 . The notch 136 divides the flange 135 into multiple sections along the circumferential direction of the inner core 13 . When the protective cap is installed on the inner core 13, the stop portion 230 is located in the gap 136, and the front end of the flange 135 and the front end of the stop portion 230 are against the rear end of the protective cap, that is, the inner core 13 utilizes the flange 135 to contact the protective cap. The back end of the cap is against, and the needle withdrawal protective sleeve 20 is against the back end of the protective cap by the stop portion 230 . When the protective cap breaks away from the inner core 13 and pushes the tail cap 172 to move forward, the needle withdrawal protection sleeve 20 moves forward, and when the needle withdrawal protection sleeve 20 moves forward a predetermined distance, the flange 135 stops the ring body 220 to prevent needle withdrawal protection. The sleeve 20 continues to move forward, that is to say, the flange 135 also plays the role of stopping the needle withdrawal protection sleeve 20, preventing the needle withdrawal protection sleeve 20 from continuing to slide forward and detaching from the inner core 13, and improving the structure of the blood collection pen 1 rationality.

It can be understood that when the tail cap 172 is pushed forward, the needle withdrawal protection sleeve 20 rotates relative to the inner core 13. In order to better guide the rotation of the needle withdrawal protection sleeve 20, as shown in FIG. At least a part of at least one side is a slope, and when the tail cap 172 moves forward to rotate the needle withdrawal protection sleeve 20, the flange 135 slides relative to the slope, so that the needle withdrawal protection sleeve 20 can rotate along a specified path until the flange 135 Blocking the ring body 220 , such setting improves the structural rationality of the blood collection device 1 .

As shown in FIG. 3 , the blood sampling pen 1 further includes a pen cap 191 , a limit cap 192 and an adjustment ring 193 . The lancet 15 has an initial position and an ejection position. In this embodiment, the lancet 15 is launched forward from the initial position to the ejection position, and the ejection position is the front limit position of the lancet 15 . The pen cap 191 is detachably connected with the inner core 13 , that is, the pen cap 191 can be detached from the inner core 13 . The limiting cap 192 is sleeved on the front end of the pen cap 191 . When in the ejection position, the needle head of the blood collection needle 15 protrudes from the front end of the stop cap 192, so that blood collection can be performed.

The rear end of the adjustment ring 193 is sleeved on the pen cap 191 , and the front end of the adjustment ring 193 is sleeved on the rear end of the limiting cap 192 . The adjustment ring 193 is adjustable in the circumferential direction of the pen cap 191 to drive the limit cap 192 to translate in the front and rear directions, thereby adjusting the length of the needle tip 151 of the blood collection needle 15 protruding from the front end of the limit cap 192 at the ejection position. That is to say, when the adjustment ring 193 is rotated along the circumferential direction of the pen cap 191, the adjustment ring 193 can drive the limit cap 192 to translate along the front and rear directions, and the translation of the limit cap 192 along the front and rear directions can adjust the front limit position of the blood collection needle 15 ( Injection position), the needlepoint 151 of the blood collection needle 15 protrudes from the front end of the stop cap 192.

According to the blood collection pen 1 according to the embodiment of the present invention, the length of the needle of the blood collection needle 15 exposed during blood collection can be adjusted by rotating the adjustment ring 193. The needle of the blood collection needle 15 protrudes from the front end of the stop cap 192 during blood collection. The rotation drives the translation of the limit cap 192 in the front-rear direction, and the translation of the limit cap 192 in the front-back direction can change the length of the needle of the blood collection needle 15 exposed from the front end of the limit cap 192 during blood collection. Rotate the adjusting ring 193 to make the limit cap 192 translate forward, which can make the exposed length of the needle of the blood collection needle 15 smaller during blood collection; The exposed length becomes longer during blood collection, and the adjustment process is simple and convenient. The limit cap 192 is sleeved on the front end of the pen cap 191, and the distance that the limit cap 192 can translate in the front and rear direction is relatively large, so the blood collection pen 1 of the embodiment of the present invention has more adjustment gears. Moreover, rotating the adjusting ring 193 makes the limit cap 192 translate back and forth, so that there will be no gaps in the appearance of the blood collection pen 1 , thereby avoiding the problem of dirt in the gaps, and making the blood collection pen 1 more practical.

As shown in Figure 13, the outer peripheral wall of the pen cap 191 is provided with a protrusion 1911, and the inner peripheral wall of the adjustment ring 193 is provided with a plurality of grooves 1931 distributed along the circumferential direction of the adjustment ring 193, and the adjustment ring 193 is relatively opposite to the pen cap 191. The protrusion 1911 selectively fits in the groove 1931 when rotated. That is to say, by rotating the adjustment ring 193, the protrusion 1911 can be selectively fitted in the groove 1931. In the natural state of the adjustment ring 193, due to the cooperation between the protrusion 1911 and the groove 1931, the adjustment ring 193 will not rotate.

Optionally, a scale is provided on the outer peripheral surface of the adjusting ring 193 along the circumferential direction of the adjusting ring 193 for indicating the position of the adjusting ring 193 to correlate with the length that the needle tip 151 of the blood collection needle 15 protrudes from the limit cap 192 at the ejection position. That is to say, a scale is provided on the outer peripheral surface of the adjustment ring 193, and the scale can play the role of indicating the position (rotation angle) of the adjustment ring 193, so that the needle point 151 of the blood collection needle 15 can be connected from the limit cap when it is in the injection position. The extended length of 192 is convenient for users to adjust.

Further, as shown in Figures 14 and 15, the inner peripheral wall of the adjustment ring 193 is provided with a limiting bar 1932, and the outer peripheral wall of the pen cap 191 is provided with a limiting groove 1912 extending in the circumferential direction of the pen cap 191, and the limiting bar 1932 fits in the The limiting slot 1912 can slide along the circumference of the pen cap 191 so as to limit the adjustment ring 193 to move back and forth relative to the pen cap 191 . That is to say, through the cooperation of the limiting strip 1932 and the limiting groove 1912, the adjusting ring 193 will not slide along the front and rear directions, and since the limiting strip 1932 can slide along the circumferential direction of the pen cap 191, the limiting strip 1932 also plays a guiding role , guide the adjustment ring 193 to rotate along the circumferential direction of the pen cap 191 .

The inner peripheral wall of the adjustment ring 193 is provided with a block 1933, and the outer peripheral wall of the pen cap 191 is provided with a block 1913. The block 1933 and the block 1913 are opposite to each other in the circumferential direction of the pen cap 191, and when the adjustment ring 193 rotates at a predetermined angle, the block 1933 stops against the card platform 1913 to limit the front limit position of the limit cap 192 . That is to say, the setting of the block 1933 and the block 1913 limits the maximum rotation angle of the adjustment ring 193. When the adjustment ring 193 is rotated to a predetermined angle, the limit cap 192 reaches the front limit position, and the block 1933 stops at this moment. Card desk 1913. Such setting prevents the limit cap 192 from sliding forward unrestrictedly or even detaching from the adjusting ring 193, so that the structure of the blood collection device 1 is more reasonable.

As shown in Figure 13, the adjusting ring 193 and the limiting cap 192 are threaded, the outer peripheral surface of the limiting cap 192 is provided with external threads 1921, and the inner peripheral surface of the adjusting ring 193 is provided with external threads 1921. Internal thread 1934. In other embodiments, an internal thread 1934 may be provided on the outer peripheral surface of the limiting cap 192 , and an external thread 1921 matching the internal thread 1934 may be provided on the inner peripheral surface of the adjusting ring 193 . The inner thread 1934 and the outer thread 1921 cooperate with each other, so that the rotation of the adjustment ring 193 drives the limit cap 192 to move back and forth.

As shown in FIG. 17 , a stepped surface 1914 is formed on the outer peripheral wall of the pen cap 191 for abutting against the limit cap 192 to limit the rear limit position of the limit cap 192 . When the limit cap 192 moves backward to the rear limit position, the step surface 1914 abuts against the rear end of the limit cap 192 so as to limit the limit cap 192 to continue to move backward. That is to say, the movement of the limit cap 192 in the front and rear direction is not unlimited, the distance between the front limit position and the rear limit position of the limit cap 192 is the maximum distance that the limit cap 192 moves forward and backward, which is also the maximum distance of the blood collection needle 15. The difference between the maximum length and the minimum length exposed by the needle when drawing blood.

In order to detachably connect the rear end of the cap 191 to the front end of the inner core 13, in this embodiment, as shown in FIG. The circumferentially extending front side wall and rear side wall of the inner core 13, the sliding groove 133 has an opening towards the circumferential direction of the inner core 13, and the inner wall surface of the pen cap 191 is provided with a sliding block 1915, the sliding block 1915 moves from the sliding groove 133 The opening enters and fits into the sliding groove 133 to limit the movement of the pen cap 191 relative to the inner core 13 forward and backward. When the pen cap 191 is installed on the front end of the inner core 13, the pen cap 191 is moved from front to back relative to the inner core 13 so that the sliding block 1915 slides from front to back until the circumferential direction of the inner core 13 is aligned with the opening of the sliding groove 133, and then Rotate the pen cap 191 to make the sliding block 1915 slide along the circumference of the inner core 13 to enter the sliding groove 133 from the opening of the sliding groove 133 , and finally fit in the sliding groove 133 . The front end of the sliding block 1915 fitted in the sliding groove 133 abuts against the front side wall of the sliding groove 133, and the rear end of the sliding block 1915 abuts against the rear side wall of the sliding groove 133, thus restricting the pen cap 191 from facing the inner core in the front-rear direction. 13 moves.

The outer wall surface of the front end of the inner core 13 is provided with a limiting portion 134, and the inner wall surface of the cap 191 is provided with a limiting block 1916, and the limiting block 1916 is offset against the limiting portion 134 in the circumferential direction of the pen cap 191 to limit the pen cap 191 relative to the inner wall. The core 13 rotates. That is to say, when the pen cap 191 is connected to the inner core 13, the limiting block 1916 is in contact with the limiting portion 134 in the circumferential direction of the pen cap 191, and the limiting portion 134 limits the rotation of the limiting block 1916 relative to the inner core 13, that is, limits The pen cap 191 rotates relative to the inner core 13 in the circumferential direction of the inner core 13 . To sum up, the cooperation between the sliding block 1915 and the sliding groove 133 and the cooperation between the limiting part 134 and the limiting block 1916 make the pen cap 191 and the inner core 13 limit each other in the front-rear direction and in the circumferential direction. The pen cap 191 It is thus connected to the inner core 13 .

It can be understood that, by applying a certain force to the pen cap 191, rotating it in the opposite direction and pulling it forward, so that the limiting part 134 is separated from the limiting block 1916 and the sliding block 1915 is separated from the sliding groove 133, the pen cap 191 can be removed. Detach from the inner core 13.

As an example, in this embodiment, as shown in FIG. 18, when the pen cap 191 is connected to the front end of the inner core 13, the sliding block 1915 abuts against the bottom of the sliding groove 133 in the circumferential direction of the inner core 13, and the limit block 1916 Abut against the limiting portion 134 to limit the sliding block 1915 from the bottom of the groove. That is to say, the abutment of the limiting block 1916 against the limiting portion 134 can limit the sliding block 1915 from sliding along the circumferential direction of the inner core 13 and detaching from the bottom of the groove. Such setting makes the structure of the blood collection pen 1 more reasonable.

As shown in Figure 19, the rear end of the limiting block 1916 is connected to the front end of the sliding block 1915, the limiting part 134 is located in front of the sliding groove 133, and the rear end surface of the limiting part 134 is a part of the front side wall of the sliding groove 133, This makes the structure of the lancet 15 more reasonable.

Further, as shown in FIG. 18 , the limiting portion 134 has a first end 1341 and a second end 1342 in the circumferential direction of the inner core 13 . When the pen cap 191 is connected to the inner core 13 , the limiting block 1916 abuts against the first end 1341 The thickness of the limiting portion 134 in the radial direction of the inner core 13 gradually decreases from the first end 1341 to the second end 1342 in the circumferential direction of the inner core 13, so that when the pen cap 191 is rotated and installed, it is convenient to limit The positioning block 1916 slides along the limiting portion 134 in the circumferential direction until it abuts against the first end 1341 . It should be noted that, when the pen cap 191 is rotated and installed, the stop block 1916 slides on the outer wall surface of the stop part 134 along the circumferential direction from the second end 1342 to the first end 1341 of the stop part 134, and when it slides to When the first end 1341 is at the position, the limiting block 1916 moves inwards and is stuck on the first end 1341 (stops against the first end 1341 ) under the elastic action of the pen cap 191 itself.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship indicated by "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the referred device or element Must be in a particular orientation, be constructed in a particular orientation, and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrated; can be mechanically connected, can also be electrically connected or can communicate with each other; can be directly connected, can also be indirectly connected through an intermediary, can be the internal communication of two components or the interaction relationship between two components, unless expressly defined otherwise. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch. Moreover, "above", "above" and "above" the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. "Below", "beneath" and "beneath" the first feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.

As used herein, the terms "one embodiment," "some embodiments," "example," "specific examples," or "some examples" mean specific features, structures, materials, or features described in connection with the embodiment or example. A feature is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and those skilled in the art can make the above-mentioned The embodiments are subject to changes, modifications, substitutions and variations.

Claims

A blood collection pen, characterized in that it comprises:

A cylinder and a firing key, the peripheral wall of the cylinder is provided with an opening, the firing key fits in the opening and is movable between a first position and a second position along the radial direction of the cylinder , the firing key has a pushing portion extending toward the barrel;

an inner core, the inner core is arranged in the cylinder and the front end of the inner core protrudes from the front end of the cylinder, and the peripheral wall of the inner core is provided with a first opening;

A needle holder and a blood collection needle, the needle holder is arranged in the inner core, the needle holder is provided with elastic claws, and the blood collection needle is installed in the needle holder;

A firing spring, the firing spring is arranged in the barrel and stops between the barrel and the needle frame, and the firing spring is used to press the needle frame forward;

Wherein, in the first position, the free end of the elastic claw protrudes into the first opening and abuts against the wall of the first opening, so as to stop the forward movement of the needle holder. In the second position, the pushing part pushes the elastic claw inwardly to break away from the inner core, so as to allow the needle holder to drive the blood collection needle to fire forward under the pressure of the firing spring.
The blood collection pen according to claim 1, wherein in the first position, the needle holder is located in the inner core, and in the second position, the front end of the needle holder is separated from the inner core. front end sticks out.
The blood collection pen according to claim 1 or 2, wherein the inner core is provided with a second opening, the second opening is located in front of the first opening, and the needle holder is launched forward to the front limit When in the position, the free end of the elastic claw extends into the second opening and abuts against the wall of the second opening.
The blood collection pen according to any one of claims 1-3, further comprising a needle withdrawal spring, the needle withdrawal spring is arranged in the inner core, and the front end of the needle withdrawal spring stops against the Inner core, when the needle frame is fired forward, the needle frame gradually compresses the needle retraction spring, and after the needle frame moves forward to the front limit position, the needle frame retraction spring pushes the needle frame toward Move backward to retract the needle tip of the lancet backward.
The blood collection pen according to any one of claims 1-4, further comprising:

a protective cap, the rear end of the protective cap is detachably connected to the front end of the inner core;

Needle withdrawal assembly, the needle withdrawal assembly includes a push-pull rod and a tail cap, the front end of the tail cap fits in the rear end of the barrel, the push-pull rod is connected with the tail cap and The rear end extends into the needle holder, and the tail cap is movable in the front and rear directions in the barrel to drive the push-pull rod to move forward, so that the push-pull rod pushes the blood collection needle forward to disengage from the Needle holder;

A needle withdrawal protection sleeve, the needle withdrawal protection sleeve is set on the inner core, the front end of the needle withdrawal protection sleeve is against the rear end of the protective cap, and the rear end of the needle withdrawal protection sleeve is in contact with the tail The front ends of the caps are opposed to limit the forward movement of the tail cap, and after the protective cap is separated from the inner core, the needle withdrawal protection sleeve and the tail cap can move forward.
The blood collection pen according to claim 5, wherein the tail cap includes a tail cap cover and a tail cap core, and the front end of the tail cap cover is movably fitted in the rear end of the barrel along the front and rear directions And the rear end of the tail cap protrudes from the rear end of the barrel, the tail cap core is installed in the tail cap sleeve, the push-pull rod is connected with the rear end of the tail cap core and the The rear end of the push-pull rod protrudes from the rear end of the tail cap core;

The end cap core includes a core sleeve and a push rod, the push rod extends forward from the core sleeve, the needle withdrawal protection sleeve has a push rod extending backward, the rear end of the push rod is connected to the push rod The front ends of the rods are offset.
The blood collection pen according to claim 6, wherein there are two push rods facing each other in the radial direction of the tail cap core, and there are two push rods corresponding to the push rods one by one.
The blood collection pen according to claim 6 or 7, characterized in that, the rear end surface of the ejector rod and the front end surface of the push rod are inclined, and when the tail cap moves forward, the rear end of the ejector rod The end surface slides relative to the front end surface of the push rod to rotate the needle withdrawal protection sleeve, so that the push rod is separated from the ejector rod.
The blood collection pen according to claim 8, characterized in that, the needle withdrawing protective sleeve comprises a ring body and a stop part connected with the ring body and extending forward, the ejector rod is connected with the ring body and Extending backward, the outer peripheral wall of the inner core is provided with a flange, the flange has a notch, and the notch divides the flange into multiple sections along the circumferential direction of the inner core, and the stop part is located at the In the gap, the front end of the flange and the front end of the stop part are against the rear end of the protective cap, wherein the flange stops the ring when the needle withdrawal protection sleeve moves forward a predetermined distance. body to prevent the needle withdrawal protection cover from moving forward.
The blood collection pen according to claim 9, characterized in that at least a part of at least one side of the stop portion is a slope, and when the tail cap moves forward to rotate the needle withdrawal protection sleeve, the flange slide against the ramp.
The blood collection pen according to any one of claims 5-10, characterized in that, the rear end of the inner core extends into the barrel from the front end of the cylinder body and the front end of the inner core extends from the front end of the cylinder body. The front end of the barrel protrudes, the protective cap is detachably connected to the front end of the inner core, and the rear end of the protective cap is against the front end of the barrel.
The blood collection pen according to any one of claims 5-10, wherein the needle withdrawal assembly further includes a cap spring, and the cap spring is arranged in the barrel and stops against the barrel Between the tail cap and the tail cap, the tail cap spring is used to press the tail cap backward.
The blood collection pen according to any one of claims 6-10, wherein steps and grooves are provided on the outer wall of the push-pull rod, and a tab is provided on the rear end surface of the tail cap core, and the The free end of the tongue is clamped in the groove and the elevation of the step is against the end cap core.
The blood collection pen according to any one of claims 5-13, further comprising a push-pull rod spring, the push-pull rod spring is sheathed on the push-pull rod, and the front end of the push-pull rod spring is in contact with the The push-pull rod stops and the rear end stops against the barrel, and the push-pull rod spring is used to press the push-pull rod forward.
The blood collection needle according to claim 14, wherein the cylindrical body includes a cylindrical sleeve and a launching spring installation sleeve, the launching spring installation sleeve is installed in the cylindrical sleeve with the opening facing forward, and the launching The rear end of the spring is located in the mounting sleeve of the launching spring and is in contact with the rear end of the mounting sleeve of the launching spring, the front end of the launching spring is in contact with the needle holder, and the front end of the tail cap spring is in contact with the launching spring. The rear ends of the mounting sleeves are against each other, and the rear ends of the push-pull rod springs are located in the firing spring mounting sleeves and are against the rear ends of the firing spring mounting sleeves.
The blood collection pen according to claim 14, wherein the push-pull rod has a front limit position, and when the push-pull rod is at the front limit position, the push-pull rod contacts the blood collection needle and the push-pull rod spring in a state of freedom.
The blood collection pen according to any one of claims 5-16, characterized in that, the front end of the push-pull rod is in contact with the rear end of the blood collection needle in the core.
The blood collection pen according to claims 1-17, characterized in that it comprises:

a pen cap, the rear end of the pen cap is detachably connected to the front end of the inner core and abuts against the front end of the barrel;

a limit cap, the limit cap is sleeved on the front end of the pen cap; and

An adjustment ring, the rear end of the adjustment ring is sleeved on the pen cap and the front end of the adjustment ring is sleeved on the rear end of the limit cap, the position of the adjustment ring in the circumferential direction of the pen cap can be adjusted Adjust to drive the limit cap to translate along the front and back directions, thereby adjusting the length of the needle tip of the blood collection needle protruding from the front end of the limit cap at the ejection position.
The blood collection pen according to claim 18, characterized in that, the outer peripheral wall of the pen cap is provided with protrusions, and the inner peripheral wall of the adjustment ring is provided with a plurality of recesses distributed along the circumferential direction of the adjustment ring at intervals. the groove, and the protrusion selectively engages in the groove when the adjustment ring rotates relative to the cap.
The blood collection pen according to claim 19, characterized in that, the inner peripheral wall of the adjustment ring is provided with a limiting bar, and the outer peripheral wall of the pen cap is provided with a limiting groove extending along the circumferential direction of the pen cap, the The limiting bar fits in the limiting groove and is slidable along the circumference of the pen cap, so as to limit the forward and backward movement of the adjustment ring relative to the pen cap.
The blood collection pen according to claim 19, characterized in that, the inner peripheral wall of the adjustment ring is provided with a block, and the outer peripheral wall of the pen cap is provided with a block, and the block and the block are arranged on the The circumferential direction of the pen cap is opposite, and when the adjusting ring rotates a predetermined angle, the block abuts against the stop to define the front limit position of the limit cap.
The blood collection pen according to any one of claims 18-21, characterized in that, the outer peripheral surface of the limit cap is provided with external threads, and the inner peripheral surface of the adjustment ring is provided with external threads. Fitting internal thread.
The blood collection pen according to claim 22, wherein a step surface for stopping against the limit cap to define a rear limit position of the limit cap is formed on the outer peripheral wall of the cap.
The blood collection pen according to any one of claims 18-23, wherein a sliding groove is provided on the outer wall surface of the front end of the inner core, and the sliding groove has a groove extending along the circumferential direction of the inner core. The front side wall and the rear side wall, the sliding groove has a circumferential opening towards the inner core, a sliding block is provided on the inner wall of the pen cap, and the sliding block enters and fits into the opening of the sliding groove within the sliding groove to limit the movement of the pen cap relative to the inner core;

The outer wall surface of the front end of the inner core is provided with a limiting part, and the inner wall surface of the pen cap is provided with a limiting block, and the limiting block abuts against the limiting part in the circumferential direction of the pen cap to limit the The cap rotates relative to the core.
The blood collection pen according to claim 24, wherein when the limiting block is in contact with the limiting part, the sliding block is in contact with the groove bottom of the sliding groove in the circumferential direction of the inner core, so that Restrict the sliding block from the bottom of the groove, the rear end of the limiting block is connected to the front end of the sliding block, the limiting part is located in front of the sliding groove, and the rear end surface of the limiting part is A part of the front side wall of the sliding groove, the limiting part has a first end and a second end in the circumferential direction of the inner core, the limiting block is against the first end, and the limiting part The thickness of the portion in the radial direction of the inner core gradually decreases in a direction from the first end to the second end in the circumferential direction of the inner core.
The blood collection pen according to any one of claims 18-25, characterized in that, the outer peripheral surface of the adjustment ring is provided along the circumferential direction of the adjustment ring for indicating the position of the adjustment ring so as to correlate with the injection Position the scale of the length that the needle tip of the blood collection needle protrudes from the limit cap.