CN113598765B

CN113598765B - Blood sampling pen

Info

Publication number: CN113598765B
Application number: CN202110851373.XA
Authority: CN
Inventors: 杨建涛
Original assignee: Tianjin Yunfan Medical Instrument Co ltd
Current assignee: Tianjin Yunfan Medical Instrument Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2023-06-02
Anticipated expiration: 2041-07-27
Also published as: CN113598765A

Abstract

The invention provides a blood sampling pen which comprises a pen body assembly, a blood sampling needle, a pen cap, a limiting cap and an adjusting ring. The blood taking needle is arranged in the pen body assembly and provided with an initial position and an ejection position. The pen cap is detachably connected with the pen body assembly. The limit cap sleeve is arranged at the front end of the pen cap. The rear end of the adjusting ring is sleeved on the pen cap, the front end of the adjusting ring is sleeved on the rear end of the limiting cap, and the position of the adjusting ring in the circumferential direction of the pen cap is adjustable to drive the limiting cap to translate along the front-back direction, so that the length of the needle point of the blood taking needle extending out from the front end of the limiting cap at the injection position is adjusted.

Description

Blood sampling pen

Technical Field

The invention relates to the field of medical blood sampling apparatuses, in particular to a blood sampling pen.

Background

The blood sampling pen is a medical blood sampling apparatus, and the blood sampling pen comprises a blood sampling needle for sampling blood, and in order to adjust the exposed length of the needle head of the blood sampling needle during blood sampling, various adjusting schemes are proposed in the related art, but various problems still exist in the related art.

Disclosure of Invention

The present invention has been made based on the findings and knowledge of the inventors regarding the following facts and problems:

in the related art, in order to adjust the length of the exposed needle head of the blood taking needle during blood taking, an adjusting ring is usually arranged, wherein one adjusting mode is that the adjusting ring does not translate when the adjusting ring is rotated, and an adjusting piece drives the blood taking needle to translate back and forth, but the adjusting mode is limited in the back and forth moving distance of the blood taking needle, so that the exposed length of the needle head is limited, and the adjusting gear is few; the other adjusting mode is to rotate the adjusting ring to enable the adjusting ring to translate back and forth, but when the adjusting ring translates forward, a gap which is gradually enlarged is formed between the adjusting ring and the barrel of the blood sampling pen, and the gap is easy to hide and dirty, so that the use of the blood sampling pen is affected.

The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the invention provides a blood sampling pen with adjustable path length and safe and reasonable structure.

According to an embodiment of the present invention, a lancing pen includes: a pen body assembly; a lancet mounted within the pen body assembly and having an initial position and an ejection position; the pen cap is detachably connected with the pen body assembly; the limiting cap is sleeved at the front end of the pen cap; and the rear end of the adjusting ring is sleeved on the pen cap, the front end of the adjusting ring is sleeved on the rear end of the limiting cap, and the circumferential position of the adjusting ring on the pen cap can be adjusted to drive the limiting cap to translate along the front-back direction, so that the length of the needle tip of the blood taking needle extending out from the front end of the limiting cap at the injection position is adjusted.

According to the blood sampling pen disclosed by the embodiment of the invention, the length of the needle head of the blood sampling needle exposed during blood sampling is adjusted by rotating the adjusting ring, the needle head of the blood sampling needle extends out of the front end of the limiting cap during blood sampling, the rotation of the adjusting ring drives the limiting cap to translate in the front-back direction, and the translation of the limiting cap in the front-back direction can change the length of the needle head of the blood sampling needle exposed from the front end of the limiting cap during blood sampling. The limiting cap is sleeved at the front end of the pen cap, and the distance that the limiting cap can translate in the front-rear direction is large, so that the regulating gears of the blood sampling pen disclosed by the embodiment of the invention are more. And moreover, the limiting cap is enabled to translate back and forth by rotating the adjusting ring, so that gaps are not formed in the appearance of the blood sampling pen, the problem of gap dirt hiding is avoided, and the blood sampling pen has better practicability.

In some embodiments, the outer peripheral wall of the pen cap is provided with a protrusion, the inner peripheral wall of the adjusting ring is provided with a plurality of grooves distributed at intervals along the circumferential direction of the adjusting ring, and the protrusion is selectively matched in the grooves when the adjusting ring rotates relative to the pen cap.

In some embodiments, the inner peripheral wall of the adjusting ring is provided with a limit bar, the outer peripheral wall of the pen cap is provided with a limit groove extending along the circumferential direction of the pen cap, and the limit bar is matched in the limit groove and can slide along the circumferential direction of the pen cap so as to limit the adjusting ring to move back and forth relative to the pen cap.

In some embodiments, a clamping block is arranged on the inner peripheral wall of the adjusting ring, a clamping table is arranged on the outer peripheral wall of the pen cap, the clamping block is opposite to the clamping table in the circumferential direction of the pen cap, and the clamping block abuts against the clamping table when the adjusting ring rotates by a preset angle so as to limit the front limit position of the limit cap.

In some embodiments, the outer circumferential surface of the limit cap is provided with external threads, and the inner circumferential surface of the adjusting ring is provided with internal threads matched with the external threads.

In some embodiments, a stepped surface is formed on the peripheral wall of the cap for stopping the limit cap to define a rear limit position of the limit cap.

In some embodiments, the pen body assembly comprises: the pen cap comprises a barrel and an inner core, wherein the inner core is arranged in the barrel, the front end of the inner core extends forwards from the front end of the barrel, and the rear end of the pen cap is detachably connected with the front end of the inner core and props against the front end of the barrel; the needle frame is arranged in the inner core, and the blood taking needle is arranged in the needle frame; and the launching spring is arranged in the cylinder body, and is stopped between the cylinder body and the needle frame and used for pressing the needle frame forwards.

In some embodiments, a sliding groove is arranged on the outer wall surface of the front end of the inner core, the sliding groove is provided with a front side wall and a rear side wall which extend along the circumferential direction of the inner core, the sliding groove is provided with an opening facing the circumferential direction of the inner core, the inner wall surface of the pen cap is provided with a sliding block, and the sliding block enters from the opening of the sliding groove and is matched in the sliding groove to limit the pen cap to move back and forth relative to the inner core; the pen cap is characterized in that a limiting part is arranged on the outer wall surface of the front end of the inner core, a limiting block is arranged on the inner wall surface of the pen cap, and the limiting block abuts against the limiting part in the circumferential direction of the pen cap to limit the pen cap to rotate 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 to be separated from the bottom of the sliding groove, the rear end of the limiting block is connected with the front end of the sliding block, the limiting portion is located in front of the sliding groove, the rear end face of the limiting portion is a part of the front side wall of the sliding groove, the limiting portion has a first end and a second end in the circumferential direction of the inner core, the limiting block abuts against the first end, and the thickness of the limiting portion in the radial direction of the inner core gradually decreases from the first end to the second end in the circumferential direction of the inner core.

In some embodiments, a scale for indicating the position of the adjusting ring to correlate the length of the tip of the lancet protruding from the limit cap at the ejection position is provided on the outer circumferential surface of the adjusting ring along the circumferential direction of the adjusting ring.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic view of a lancet according to an embodiment of the present invention.

Fig. 2 is a front view of a lancet according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a lancet according to an embodiment of the present invention.

Fig. 4 is a second cross-sectional view of a lancet according to an embodiment of the present invention.

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

Fig. 6 is a schematic view of a lancet according to an embodiment of the present invention.

Fig. 7 is a partial schematic view of a lancing pen according to an embodiment of the present invention.

Fig. 8 is a partial schematic view of a lancing pen according to an embodiment of the present invention.

Fig. 9 is a cross-sectional view of fig. 8.

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

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

Fig. 12 is a partial schematic diagram of a fourth embodiment according to the invention.

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

Fig. 14 is a schematic view of an adjusting ring according to an embodiment of the invention.

Fig. 15 is a cross-sectional view of fig. 14.

Fig. 16 is a schematic view of a cap according to an embodiment of the invention.

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

Fig. 18 is a partial schematic view of a lancing pen according to an embodiment of the present invention.

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

Reference numerals:

1. a blood sampling pen; 11. a cylinder; 111. opening holes; 112. a cylinder sleeve; 113. a transmitting spring mounting sleeve; 12. a transmitting key; 121. a pressing part; 13. an inner core; 131. a first opening; 132. a second opening; 133. a sliding groove; 134. a limit part; 1341. a first end; 1342. a second end; 135. a flange; 136. a notch; 14. a needle holder; 141. an elastic claw; 15. a blood taking needle; 151. a needle tip; 16. a firing spring; 171. a push-pull rod; 1711. a step; 1712. a clamping groove; 172. a tail cap; 1721. a tail cap sleeve; 1722. a tail cap core; 1723. a clamping tongue; 1724. a core sleeve; 1725. a push rod; 173. tail cap springs; 18. a push-pull rod spring; 191. a cap; 1911. a protrusion; 1912. a limit groove; 1913. a clamping table; 1914. a step surface; 1915. a sliding block; 1916. a limiting block; 192. a limit cap; 1921. an external thread; 193. an adjusting ring; 1931. a groove; 1932. a limit bar; 1933. a clamping block; 1934. an internal thread; 20. needle withdrawing protective sleeve; 210. a push rod; 220. a ring body; 230. a stop portion; 21. and (5) withdrawing the needle spring.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.

The lancet 1 according to the embodiment of the present invention is described below with reference to fig. 1 to 19. As shown in fig. 3, the lancet 1 includes a pen body assembly, a lancet 15, a cap 191, a stopper cap 192, and an adjustment ring 193.

The lancet 15 is mounted in the pen body assembly and has an initial position and an ejection position, and in this embodiment, the lancet 15 is forwardly emitted from the initial position to the ejection position, which is a front limit position of the lancet 15. The cap 191 is detachably connected to the pen body assembly, i.e., the cap 191 can be detached from the pen body assembly. The limit cap 192 is sleeved on the front end of the pen cap 191. In the ejection position, the needle of the lancet 15 protrudes from the front end of the stopper cap 192, so that blood collection can be performed.

The rear end of the adjusting ring 193 is sleeved on the pen cap 191, and the front end of the adjusting ring 193 is sleeved on the rear end of the limit cap 192. The adjustment ring 193 is position-adjustable in the circumferential direction of the cap 191 to drive the stopper cap 192 to translate in the front-rear direction, thereby adjusting the length of the needle tip 151 of the lancet 15 protruding from the front end of the stopper cap 192 in the ejection position. That is, when the adjustment ring 193 is rotated in the circumferential direction of the pen cap 191, the adjustment ring 193 may drive the limit cap 192 to translate in the front-rear direction, and the translation of the limit cap 192 in the front-rear direction may adjust the length of the needle tip 151 of the lancet 15 protruding from the front end of the limit cap 192 when the lancet 15 is at the front limit position (ejection position).

According to the blood sampling pen 1 provided by the embodiment of the invention, the length of the needle head of the blood sampling needle 15 exposed during blood sampling is adjusted by rotating the adjusting ring 193, the needle head of the blood sampling needle 15 extends out of the front end of the limiting cap 192 during blood sampling, the rotation of the adjusting ring 193 drives the limiting cap 192 to translate in the front-back direction, and the translation of the limiting cap 192 in the front-back direction can change the length of the needle head of the blood sampling needle 15 exposed from the front end of the limiting cap 192 during blood sampling. The limiting cap 192 is moved forward by the rotation of the adjusting ring 193, the exposed length of the needle head of the blood taking needle 15 during blood taking can be reduced, the exposed length of the needle head of the blood taking needle 15 during blood taking can be prolonged by the movement of the limiting cap 192 backward by the rotation of the adjusting ring 193, and the adjusting process is simple and convenient. The limit cap 192 is sleeved at the front end of the pen cap 191, and the distance that the limit cap 192 can translate in the front-rear direction is large, so that the blood sampling pen 1 of the embodiment of the invention has more adjustment gears. In addition, the limiting cap 192 is translated back and forth by rotating the adjusting ring 193, so that gaps are not formed in the appearance of the blood collection pen 1, the problem of gap dirt accumulation is avoided, and the blood collection pen 1 has better practicability.

As shown in fig. 13, a protrusion 1911 is provided on the outer circumferential wall of the cap 191, and a plurality of grooves 1931 are provided on the inner circumferential wall of the adjustment ring 193 at intervals along the circumferential direction of the adjustment ring 193, and the protrusion 1911 is selectively fitted in the grooves 1931 when the adjustment ring 193 rotates relative to the cap 191. That is, by rotating the adjustment ring 193, the protrusion 1911 can be selectively fitted into the groove 1931, and the adjustment ring 193 does not rotate due to the fitting of the protrusion 1911 with the groove 1931 in a natural state.

Optionally, a scale for indicating the position of the adjustment ring 193 to correlate the length of the needle tip 151 of the lancet 15 protruding from the limit cap 192 at the ejection position is provided on the outer circumferential surface of the adjustment ring 193 along the circumferential direction of the adjustment ring 193. That is, the outer circumferential surface of the adjustment ring 193 is provided with scales, which can play a role of indicating the position (rotation angle) of the adjustment ring 193, so that the length of the needle tip 151 of the lancet 15 protruding from the limit cap 192 at the ejection position can be associated, thereby facilitating the adjustment of the user.

Further, as shown in fig. 15, the inner peripheral wall of the adjustment ring 193 is provided with a limit bar 1932, the outer peripheral wall of the cap 191 is provided with a limit groove 1912 extending along the circumferential direction of the cap 191, and the limit bar 1932 is fitted in the limit groove 1912 and slidable along the circumferential direction of the cap 191 so as to limit the adjustment ring 193 from moving back and forth relative to the cap 191. That is, by the cooperation of the limit strips 1932 and the limit grooves 1912, the adjustment ring 193 does not slide in the front-rear direction, and since the limit strips 1932 are slidable in the circumferential direction of the cap 191, the limit strips 1932 also play a guiding role, guiding the adjustment ring 193 to rotate in the circumferential direction of the cap 191.

The inner circumferential wall of the adjusting ring 193 is provided with a clamping block 1933, the outer circumferential wall of the pen cap 191 is provided with a clamping table 1913, the clamping block 1933 is opposite to the clamping table 1913 in the circumferential direction of the pen cap 191, and the clamping block 1933 abuts against the clamping table 1913 when the adjusting ring 193 rotates by a predetermined angle to limit the front limit position of the limit cap 192. That is, the provision of the latch 1933 and the latch 1913 limits the maximum rotation angle of the adjustment ring 193, and when the adjustment ring 193 is rotated to a predetermined angle, the limit cap 192 reaches the front limit position, at which time the latch 1933 is stopped against the latch 1913. The limiting cap 192 is prevented from sliding forward without limitation and even separating from the adjusting ring 193, so that the structure of the blood sampling pen 1 is more reasonable.

As shown in fig. 13, the adjusting ring 193 is in threaded engagement with the stopper cap 192, the outer peripheral surface of the stopper cap 192 is provided with external threads 1921, and the inner peripheral surface of the adjusting ring 193 is provided with internal threads 1934 engaged with the external threads 1921. In other embodiments, the limit cap 192 may have internal threads 1934 on its outer circumference and external threads 1921 on the inner circumference of the adjustment ring 193 that mate with the internal threads 1934. The internal threads 1934 cooperate with the external threads 1921 such that rotation of the adjustment ring 193 moves the limit cap 192 back and forth.

As shown in fig. 17, a step surface 1914 for abutting against the cap 192 to define the rear limit position of the cap 192 is formed on the outer peripheral wall of the cap 191. When the limit cap 192 moves rearward to the rear limit position, the step surface 1914 abuts against the rear end of the limit cap 192 to limit continued rearward movement of the limit cap 192. That is, the movement of the stopper cap 192 in the front-rear direction is not limited, and the distance between the front and rear limit positions of the stopper cap 192 is the maximum distance that the stopper cap 192 moves forward and backward, and is also the difference between the maximum and minimum lengths exposed when the needle of the lancet 15 is used to collect blood.

As shown in fig. 3, the pen body assembly includes a barrel 11, an inner core 13, a needle holder 14, and a firing spring 16. The inner core 13 is provided inside the cylinder 11 and a front end of the inner core 13 protrudes from the front end of the cylinder 11. The rear end of the cap 191 is detachably connected to the front end of the inner core 13, and the rear end of the cap 191 abuts against the front end of the barrel 11. The needle holder 14 is provided in the inner core 13, and the lancet 15 is mounted in the needle holder 14. A firing spring 16 is provided within the barrel 11 and is stopped between the barrel 11 and the needle holder 14, the firing spring 16 being adapted to urge the needle holder 14 forward. The needle holder 14 may drive the lancet 15 to be emitted forward under the compression of the emission spring 16.

In order to detachably connect the rear end of the cap 191 with the front end of the core 13, in this embodiment, as shown in fig. 18, a slide groove 133 is provided on the outer wall surface of the front end of the core 13, the slide groove 133 has a front side wall and a rear side wall extending in the circumferential direction of the core 13, the slide groove 133 has an opening toward the circumferential direction of the core 13, a slide block 1915 is provided on the inner wall surface of the cap 191, and the slide block 1915 enters from the opening of the slide groove 133 and fits into the slide groove 133 to restrict the front-rear movement of the cap 191 with respect to the core 13. When the cap 191 is mounted to the front end of the core 13, the cap 191 is moved forward and backward relative to the core 13 to slide the sliding block 1915 forward and backward until it is aligned with the opening of the sliding groove 133 in the circumferential direction of the core 13, and the cap 191 is rotated again to slide the sliding block 1915 in the circumferential direction of the core 13 to enter the sliding groove 133 from the opening of the sliding groove 133 and finally fit into 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, thereby restricting the movement of the cap 191 relative to the core 13 in the front-rear direction.

The outer wall surface of the front end of the inner core 13 is provided with a limiting part 134, the inner wall surface of the pen cap 191 is provided with a limiting block 1916, and the limiting block 1916 abuts against the limiting part 134 in the circumferential direction of the pen cap 191 to limit the rotation of the pen cap 191 relative to the inner core 13. That is, when the cap 191 is connected to the core 13, the stopper 1916 abuts against the stopper 134 in the circumferential direction of the cap 191, and the stopper 134 restricts the rotation of the stopper 1916 relative to the core 13, that is, the cap 191 is restricted from rotating relative to the core 13 in the circumferential direction of the core 13. In summary, the cooperation between the sliding block 1915 and the sliding groove 133 and the cooperation between the stopper portion 134 and the stopper 1916 cause the cap 191 and the inner core 13 to be restricted to each other in the front-rear direction and in the circumferential direction, and the cap 191 is thereby connected to the inner core 13.

It will be appreciated that the cap 191 is pulled out forward after being rotated in the opposite direction by applying a certain force to the cap 191, so that the stopper portion 134 is separated from the stopper 1916 and the sliding block 1915 is separated from the sliding groove 133, and the cap 191 can be separated from the core 13.

As an example, in the present embodiment, as shown in fig. 18, when the cap 191 is connected to the front end of the core 13, the sliding block 1915 abuts against the groove bottom of the sliding groove 133 in the circumferential direction of the core 13, and the stopper 1916 abuts against the stopper 134 to restrict the sliding block 1915 from coming off the groove bottom. That is, the stopper 1916 can restrict the sliding block 1915 from sliding in the circumferential direction of the core 13 against the stopper portion 134 to be separated from the groove bottom. So set up and make the structure of blood sampling pen 1 more reasonable.

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

Further, as shown in fig. 18, the stopper 134 has a first end 1341 and a second end 1342 in the circumferential direction of the inner core 13, and when the cap 191 is connected to the inner core 13, the stopper 1916 abuts against the first end 1341, and the thickness of the stopper 134 in the radial direction of the inner core 13 gradually decreases in the circumferential direction of the inner core 13 from the first end 1341 toward the second end 1342, so that the stopper 1916 is facilitated to slide along the stopper 134 in the circumferential direction until abutting against the first end 1341 when the cap 191 is rotatably mounted. When the cap 191 is rotatably mounted, the stopper 1916 slides circumferentially from the second end 1342 to the first end 1341 of the stopper 134 on the outer wall surface of the stopper 134, and when the stopper 1916 slides to the first end 1341, the stopper 1916 moves inward to be caught on the first end 1341 (to be stopped against the first end 1341) by the self-elasticity of the cap 191.

As shown in fig. 3, the lancet 1 further includes a firing key 12. The circumferential wall of the cylinder 11 is provided with an opening 111, and the transmission key 12 is fitted in the opening 111 and movable in the radial direction of the cylinder 11 between a first position and a second position. The emission key 12 has a pressing portion 121 extending toward the inside of the cylinder 11. The inner core 13 is provided in the cylinder 11 and a front end of the inner core 13 protrudes from the front end of the cylinder 11, and a peripheral wall of the inner core 13 is provided with a first opening 131. The needle holder 14 is provided in the inner core 13, the needle holder 14 is provided with elastic claws 141, and the lancet 15 is mounted in the needle holder 14. A firing spring 16 is provided within the barrel 11 and is stopped between the barrel 11 and the needle holder 14, the firing spring 16 being adapted to urge the needle holder 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, and in the second position, the pushing part 121 pushes the elastic claw 141 inwards to separate from the inner core 13, so as to allow the needle holder 14 to drive the blood taking needle 15 to be launched forward under the compression of the launching spring 16.

When the blood sampling pen 1 is used, the emission key 12 is pressed inwards along the radial direction of the barrel 11, so that the emission key 12 moves from the first position to the second position, during the moving process, the free end of the pushing part 121 on the inner side of the emission key 12 pushes the elastic claw 141 of the needle frame 14 inwards through the first opening 131 formed on the inner core 13, so that the elastic claw 141 moves from the stop position stopped by the inner core 13 to the release position separated from the stop of the inner core 13, and after the elastic claw 141 is separated from the stop of the inner core 13, the needle frame 14 is emitted forwards along the axial direction of the blood sampling pen 1 due to the fact that the emission spring 16 pushes the needle frame 14 forwards. At the same time, the lancet 15 mounted in the needle holder 14 is forwardly emitted, thereby completing the blood collection process.

According to the blood sampling pen 1 provided by the embodiment of the invention, the needle frame 14 can drive the blood sampling needle 15 to emit forwards by pressing the emission key 12, so that the blood sampling function is realized. The pushing part 121 of the launching key 12 pushes the elastic claw 141 on the needle frame 14 inwards, so that the elastic claw 141 is separated from the stopping of the inner core 13 and is launched forwards under the compression of the launching spring 16, and the operation process is simple, safe and convenient.

Specific embodiments of the present invention are described in detail below with reference to fig. 1-19.

As shown in fig. 3, the lancet 1 includes a barrel 11, a firing key 12, an inner core 13, a needle holder 14, a lancet 15, and a firing spring 16.

The inner core 13 is provided in the cylinder 11, and the front end of the inner core 13 protrudes from the front end of the cylinder 11, and the inner core 13 and the cylinder 11 are fixed to each other. The opening 111 formed in the cylinder 11 is opposite to the first opening 131 formed in the inner core 13 in the radial direction of the cylinder 11, the emission key 12 protrudes outward from the opening 111 of the cylinder 11, and a part of the emission key 12 protrudes outward relative to the outer peripheral wall of the cylinder 11, so that the emission key is convenient to press. The needle holder 14 is provided within the inner core 13, and when the needle holder 14 is not fired forward, i.e., when the needle holder 14 is in a state to be fired, as shown in fig. 3, the front end of the needle holder 14 is flush or substantially flush with the front end of the inner core 13. It will be appreciated that when the needle holder 14 is fired forwardly, the needle holder 14 slides forwardly relative to the core 13, with the forward end of the needle holder 14 projecting from the forward end of the core 13. The rear end of the firing spring 16 abuts against the cylinder 11, and the front end abuts against the rear end of the needle holder 14. In the first position, i.e. the needle holder 14 is to be fired, the firing spring 16 is in a compressed state. Optionally, the needle holder 14 and the inner core 13 are limited in the circumferential direction of the inner core 13, so that the needle holder 14 can only slide along the front-back direction relative to the inner core 13, the needle holder 14 and the blood taking needle 15 can be more stably launched, and the needle holder 14 is prevented from rotating during forward launching, so that the blood taking effect is prevented from being influenced.

The free end of the elastic claw 141 of the needle holder 14 is the front end thereof, and when the shoot key 12 is positioned at 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, thereby stopping the forward movement of the needle holder 14. When the pushing part 121 of the shot key 12 is pushed inward by pressing the shot key 12 so that the free end of the elastic claw 141 is pushed inward, the free end of the elastic claw 141 is separated from the abutment of the front wall of the first opening 131, that is, the inner core 13 loses the stop action on the needle holder 14, and the needle holder 14 drives the lancet 15 to be ejected forward under the action of the shot spring 16.

As shown in fig. 3, the front end of the lancet 15 is a needle point 151, and the rear end of the lancet 15 is fitted from the front end of the needle holder 14. Alternatively, a protrusion is provided on the inner circumferential wall of the needle holder 14, a groove corresponding to the protrusion is provided on the outer circumferential wall of the lancet 15, the lancet 15 is loaded into the front end of the needle holder 14 from front to back until the protrusion of the needle holder 14 is fitted in the groove, the lancet 15 and the needle holder 14 are thereby brought into position with each other, and the lancet 15 is mounted in the needle holder 14. It should be noted that, in order to improve the safety and avoid the cross infection, the lancet 15 in this embodiment is a disposable product, and the lancet 15 may be detached from the needle holder 14 after the use of the lancet 15 is completed to replace the new lancet 15, so the lancet 1 provided in this embodiment may be reused, and only the lancet 15 needs to be replaced.

Further, as shown in fig. 8 and 9, the inner core 13 is further provided with a second opening 132, the second opening 132 is located in front of the first opening 131, and when the needle holder 14 is forwardly launched to the front limit position, the free end of the elastic claw 141 extends into the second opening 132 and abuts against the wall of the second opening 132. That is, the second opening 132 serves to limit the front limit position of the needle holder 14. The front limit position of the needle holder 14 is the limit position when the needle holder 14 is fired forward. Specifically, when the needle holder 14 is forwardly launched, the elastic claw 141 is disengaged 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, the free end of the elastic claw 141 will protrude from the second opening 132 due to the elasticity of the elastic claw 141, the needle holder 14 continues to be forwardly launched, the free end of the elastic claw 141 will stop against the front wall of the second opening 132, and thus the inner core 13 stops the needle holder 14 again, even when the launching spring 16 still presses the needle holder 14 forward, the needle holder 14 does not slide forward any more, and at this time the needle holder 14 reaches its front limit position.

As shown in fig. 3, the lancet 1 further includes a needle withdrawing spring 21. The needle withdrawing spring 21 is arranged in the inner core 13, the front end of the needle withdrawing spring 21 is abutted against the inner core 13, the rear end of the needle withdrawing spring 21 is abutted against the needle frame 14, and the needle frame 14 gradually compresses the needle withdrawing spring 21 when the needle frame 14 is emitted forwards. After the needle holder 14 moves forward to the front limit position, the needle return spring 21 pushes the needle holder 14 to move backward to retract the needle tip 151 of the lancet 15 backward. That is, when the needle frame 14 moves forward to the limit position, the needle head of the lancet 15 also reaches the front limit position, at this time, the needle withdrawing spring 21 presses the needle frame 14 backward, the needle frame 14 moves backward under the pressing of the needle withdrawing spring 21 and drives the needle point 151 of the lancet 15 to move backward, thereby avoiding the accident of accidental injury caused by the needle head of the emitted lancet 15.

As shown in fig. 3, the lancet 1 further includes a needle withdrawing assembly including a push-pull rod 171, a tail cap 172, and a tail cap spring 173. The needle retraction assembly is used to disengage the lancet 15 from the needle holder 14 so that the lancet 15 can be replaced.

The front end of the tail cap 172 fits within the rear end of the barrel 11, i.e., the front end of the tail cap 172 extends from the rear end of the barrel 11 into the barrel 11. The tail cap 172 is movably disposed in the front-rear direction within the barrel 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 from the rear end of the needle holder 14 into the needle holder 14. The tail cap 172 is pushed forward to 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, the front end of the push-pull rod 171 pushes the rear end of the blood taking needle 15 forward, and the blood taking needle 15 is separated from the front end of the needle frame 14, namely the push-pull rod 171 pushes the blood taking needle 15 forward to be separated from the needle frame 14. A tail cap spring 173 is provided in the barrel 11, the tail cap spring 173 being stopped between the barrel 11 and the tail cap 172, the tail cap spring 173 being for urging the tail cap 172 rearward. That is, the rear end of the tail cap spring 173 abuts against the tail cap 172, the front end of the tail cap spring 173 abuts against the cylinder 11, the tail cap spring 173 is compressed by the tail cap 172 when the tail cap 172 moves forward, and the tail cap 172 moves backward to the initial position by the tail cap spring 173 when the forward pushing force exerted on the tail cap 172 is removed.

Specifically, as shown in fig. 3, the tail cap 172 includes a tail cap sleeve 1721 and a tail cap core 1722. The front end of the tail cap 1721 is fitted in the rear end of the barrel 11 movably in the front-rear direction, and the rear end of the tail cap 1721 protrudes from the rear end of the barrel 11. The tail cap core 1722 An Zhuangwei is disposed in the cap sleeve 1721, and the tail cap core 1722 and the tail cap sleeve 1721 are limited in the front-rear direction, when the rear end of the tail cap sleeve 1721 is pushed forward, the tail cap sleeve 1721 drives the tail cap core 1722 to move forward. The rear end of the tail cap spring 173 abuts against the rear end of the tail cap core 1722, the tail cap spring 173 pushes the tail cap core 1722 backwards, and the tail cap core 1722 drives the tail cap spring 173 to move backwards.

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 extends 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 clamping groove 1712, the rear end surface of the tail cap core 1722 is provided with a clamping tongue 1723, the free end of the clamping tongue 1723 is clamped in the clamping groove 1712, and the vertical surface of the step 1711 is propped against the tail cap core 1722. As shown in fig. 4, the latch 1723 extends rearward and is retained on the rear sidewall of the catch 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 forward of and against the front face of the rear end of the tail cap core 1722 to stop the push-pull rod 171 from moving rearward relative to the tail cap core 1722. Thus, the push-pull rod 171 and the tail cap core 1722 are limited to each other in the front-rear direction, when the tail cap core 1722 is driven by the tail cap sleeve 1721 to move forward, the tail cap core 1722 drives the push-pull rod 171 to move forward, and when the tail cap core 1722 is driven by the tail cap spring 173 to move backward, the tail cap core 1722 drives the push-pull rod 171 to move backward.

Further, as shown in fig. 3, the blood sampling pen 1 further includes a push-pull rod spring 18, the push-pull rod spring 18 is sleeved on the push-pull rod 171, the front end of the push-pull rod spring 18 abuts against the push-pull rod 171, the rear end abuts against the barrel 11, and the push-pull rod spring 18 is used for pressing the push-pull rod 171 forward. The push-pull rod 171 moves rearward under the action of the tail cap spring 173, and the push-pull rod 171 gradually compresses the push-pull rod spring 18. When the forward force applied to the push-pull rod 171 by the push-pull rod spring 18 and the rearward force applied to the push-pull rod 171 by the tail cap spring 173 are balanced with each other, the push-pull rod 171 stops moving and reaches the rear limit position. By providing the push-pull rod spring 18, excessive rearward movement due to inertia when the tail cap 172 and the push-pull rod 171 are moved rearward can be avoided. If the push-pull rod 171 moves too far rearward, it is likely that the front end of the push-pull rod 171 will affect the firing of the needle holder 14. Further, as shown in fig. 3, when the push-pull rod 171 reaches the rear limit position, the front end of the push-pull rod 171 can be in contact with the rear end of the lancet 15, so that the lancet 15 can be ejected forward more quickly by the needle withdrawing assembly when the needle withdrawing is enabled.

The barrel 11 includes a barrel housing 112 and a firing spring mounting sleeve 113, the firing spring mounting sleeve 113 being mounted within the barrel housing 112 and opening forwardly. The rear end of the firing spring 16 is located within the firing spring mounting sleeve 113 and abuts against the rear end of the firing spring mounting sleeve 113, and the front end of the firing spring 16 abuts against the needle holder 14. The front end of the tail cap spring 173 abuts against the rear end of the firing spring mounting sleeve 113. The rear end of the push-pull rod spring 18 is positioned in the firing spring mounting sleeve 113 and abuts against the rear end of the firing spring mounting sleeve 113. As an example, as shown in fig. 3, the rear end of the shot spring 16 extends into the shot spring mounting sleeve 113 from the front end opening of the shot spring mounting sleeve 113 and abuts against the rear end of the shot spring mounting sleeve 113, and the rear end of the shot spring 16 abuts against the rear end of the needle holder 14. The rear end of the push-pull rod spring 18 extends into the firing spring mounting sleeve 113 from the front end opening of the firing spring mounting sleeve 113 and abuts against the rear end of the firing spring mounting sleeve 113. It will be appreciated that the firing spring 16 and the push-pull rod spring 18 do not interfere with each other, alternatively the firing spring 16 is sleeved with the push-pull rod spring 18. The tail cap spring 173 is located behind the firing spring mounting sleeve 113 with its front end abutting against the rear end face of the rear end of the firing spring mounting sleeve 113.

As shown in fig. 11 and 12, the lancet 1 further includes a needle withdrawal protective sheath 20. The needle withdrawing protective sleeve 20 is sleeved on the inner core 13, the front end of the needle withdrawing protective sleeve 20 abuts against the rear end of the protective cap, the rear end of the needle withdrawing protective sleeve 20 abuts against the front end of the tail cap 172 to limit the tail cap 172 to move forwards, and after the protective cap is separated from the inner core 13, the needle withdrawing protective sleeve 20 and the tail cap 172 can move forwards. The needle retraction sheath 20 is used to avoid false needle retraction operations. When the protective cap is not separated from the inner core 13, the front end of the needle withdrawal protective sleeve 20 abuts against the rear end of the protective cap, and the rear end of the needle withdrawal protective sleeve 20 abuts against the front end of the tail cap 172, so that even if a forward force is applied to the tail cap 172, the tail cap 172 cannot be slid forward, and the push-pull rod 171 cannot push the lancet 15 forward to withdraw the needle. When the protective cap is separated from the inner core 13, the needle withdrawing protective sleeve 20 is not limited by the protective cap any more, and at the moment, the tail cap 172 can be moved forwards by applying the pushing force to the tail cap 172, and the push-pull rod 171 can push the blood taking needle 15 to withdraw the needle as the tail cap 172 can be moved forwards.

The blood sampling pen 1 according to the embodiment of the present invention includes the needle withdrawal protection sleeve 20 which plays a role of needle withdrawal protection, and when the protection cap is connected to the inner core 13, the needle withdrawal protection cap can prevent the tail cap 172 from moving forward, thereby avoiding a false needle withdrawal accident, and therefore, the blood sampling pen 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 withdrawing protective sleeve 20 has a push rod 210 extending backward, and the rear end of the push rod 210 abuts against the front end of the push rod 1725, i.e. the front end of the needle withdrawing protective sleeve 20 abuts against the rear end of the protective cap.

Optionally, as shown in fig. 11 and 12, two push rods 1725 are opposite to each other in the radial direction of the tail cap core 1722, and two push rods 210 are in one-to-one correspondence with the push rods 1725, so that the anti-abutment between the needle withdrawing protective sleeve 20 and the protective cap is more stable, and the structural rationality is improved.

Further, as shown in fig. 11 and 12, the rear end surface of the push rod 210 and the front end surface of the push rod 1725 are both inclined surfaces. When the tail cap 172 moves forward, the rear end surface of the push rod 210 slides relative to the front end surface of the push rod 1725 to rotate the needle retraction sheath 20, so that the push rod 1725 is disengaged from the push rod 210. That is, when the tail cap 172 is pushed to move forward, since the rear end face of the push rod 210 and the front end face of the push rod 1725 are both inclined planes, the rear end face of the push rod 210 will slide relatively to the front end face of the push rod 1725, so that the needle withdrawing protective sleeve 20 rotates, and the push rod 1725 is separated from the push rod 210, i.e. the needle withdrawing protective sleeve 20 is separated from the tail cap 172. While the tail cap 172 continues to move forward, the needle retraction sheath 20 does not move forward any further as it is disengaged from the tail cap 172.

As shown in fig. 11 and 12, the needle withdrawal protective sheath 20 includes a ring 220 and a stopper 230 connected to the ring 220 and extending forward, and the ring 220 is sleeved on the inner core 13. The ejector rod 210 is connected with the ring body 220 and extends backwards, a flange 135 is arranged on the outer peripheral wall of the inner core 13, the flange 135 is provided with a notch 136, and the notch 136 divides the flange 135 into a plurality of sections along the circumferential direction of the inner core 13. When the protective cap is mounted on the inner core 13, the stop portion 230 is located in the notch 136, and the front end of the flange 135 and the front end of the stop portion 230 are abutted against the rear end of the protective cap, that is, the inner core 13 is abutted against the rear end of the protective cap by the flange 135, and the withdrawal protecting sleeve 20 is abutted against the rear end of the protective cap by the stop portion 230. When the protective cap is separated from the inner core 13 and pushes the tail cap 172 to move forward, the needle withdrawing protective sleeve 20 moves forward, and when the needle withdrawing protective sleeve 20 moves forward by a predetermined distance, the flange 135 stops the ring body 220 to prevent the needle withdrawing protective sleeve 20 from moving forward, that is, the flange 135 also plays a role of stopping the needle withdrawing protective sleeve 20, so that the needle withdrawing protective sleeve 20 is prevented from sliding forward continuously to separate from the inner core 13, and the structural rationality of the blood sampling pen 1 is improved.

It will be appreciated that, when the tail cap 172 is pushed forward, the needle withdrawal protective sheath 20 rotates relative to the inner core 13, and at least a portion of at least one side of the abutment 230 is inclined as shown in fig. 12 in order to better guide the rotation of the needle withdrawal protective sheath 20, and when the tail cap 172 is moved forward to rotate the needle withdrawal protective sheath 20, the flange 135 slides relative to the inclined surface, so that the needle withdrawal protective sheath 20 can rotate along a designated path until the flange 135 abuts against the ring body 220, which improves the structural rationality of the lancet 1.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims

1. A blood collection pen, comprising:

a pen body assembly;

the pen cap is detachably connected with the pen body assembly;

the pen body assembly includes: the pen cap comprises a barrel and an inner core, wherein the inner core is arranged in the barrel, the front end of the inner core extends forwards from the front end of the barrel, and the rear end of the pen cap is detachably connected with the front end of the inner core and props against the front end of the barrel;

the needle frame is arranged in the inner core; and

the shooting spring is arranged in the cylinder body, and is stopped between the cylinder body and the needle frame and used for pressing the needle frame forwards;

a lancet mounted in the pen body assembly and having an initial position and an ejection position, the lancet being mounted in the needle holder;

the limiting cap is sleeved at the front end of the pen cap; and

the rear end of the adjusting ring is sleeved on the pen cap, the front end of the adjusting ring is sleeved on the rear end of the limiting cap, and the position of the adjusting ring in the circumferential direction of the pen cap is adjustable to drive the limiting cap to translate along the front-back direction, so that the length of the needle point of the blood taking needle extending out of the front end of the limiting cap at the ejection position is adjusted;

the front end of the tail cap is matched in the rear end of the barrel, the push-pull rod is connected with the tail cap and extends into the needle frame from the rear end of the needle frame, the tail cap is movable in the barrel along the front-back direction so as to drive the push-pull rod to move forwards, the push-pull rod pushes the blood taking needle to be separated from the needle frame forwards, and the tail cap spring is arranged in the barrel and is stopped between the barrel and the tail cap and is used for pressing the tail cap backwards;

the push-pull rod spring is sleeved on the push-pull rod, the front end of the push-pull rod spring is abutted against the push-pull rod, the rear end of the push-pull rod spring is abutted against the cylinder body, and the push-pull rod spring is used for pressing the push-pull rod forwards;

the push-pull rod spring is used for pressing the push-pull rod forwards, when the forward force applied by the push-pull rod spring to the push-pull rod and the backward force applied by the tail cap spring to the push-pull rod are balanced, the push-pull rod stops moving and reaches a rear limit position, and when the push-pull rod reaches the rear limit position, the front end of the push-pull rod is contacted with the rear end of the blood taking needle.

2. The blood sampling pen according to claim 1, wherein a protrusion is provided on an outer circumferential wall of the pen cap, a plurality of grooves are provided on an inner circumferential wall of the adjusting ring at intervals along a circumferential direction of the adjusting ring, and the protrusion is selectively fitted in the groove when the adjusting ring rotates relative to the pen cap.

3. The blood sampling pen according to claim 2, wherein the inner peripheral wall of the adjusting ring is provided with a limit bar, the outer peripheral wall of the pen cap is provided with a limit groove extending along the circumferential direction of the pen cap, and the limit bar is matched in the limit groove and can slide along the circumferential direction of the pen cap so as to limit the adjusting ring to move back and forth relative to the pen cap.

4. The blood sampling pen according to claim 2, wherein a clamping block is arranged on the inner peripheral wall of the adjusting ring, a clamping table is arranged on the outer peripheral wall of the pen cap, the clamping block is opposite to the clamping table in the circumferential direction of the pen cap, and the clamping block is abutted against the clamping table when the adjusting ring rotates by a preset angle so as to limit the front limit position of the limit cap.

5. The blood sampling pen according to any one of claims 1 to 4, wherein an external thread is provided on an outer circumferential surface of the limit cap, and an internal thread which is engaged with the external thread is provided on an inner circumferential surface of the adjustment ring.

6. The lancet of claim 5, wherein a stepped surface for stopping the limit cap to define a rear limit position of the limit cap is formed on an outer circumferential wall of the cap.

7. The blood sampling pen according to claim 1, wherein a sliding groove is provided on an outer wall surface of a front end of the inner core, the sliding groove has a front side wall and a rear side wall extending in a circumferential direction of the inner core, the sliding groove has an opening facing the circumferential direction of the inner core, a sliding block is provided on an inner wall surface of the cap, and the sliding block enters from the opening of the sliding groove and fits into the sliding groove to restrict the cap from moving back and forth relative to the inner core;

the pen cap is characterized in that a limiting part is arranged on the outer wall surface of the front end of the inner core, a limiting block is arranged on the inner wall surface of the pen cap, and the limiting block abuts against the limiting part in the circumferential direction of the pen cap to limit the pen cap to rotate relative to the inner core.

8. The lancing pen according to claim 7, wherein the slider is abutted against a groove bottom of the sliding groove in a circumferential direction of the inner core when the stopper is abutted against the stopper portion so as to restrict the slider from being separated from the groove bottom, a rear end of the stopper is connected to a front end of the slider, the stopper portion is located in front of the sliding groove, a rear end face of the stopper portion is a portion of a front side wall of the sliding groove, the stopper portion has a first end and a second end in the circumferential direction of the inner core, the stopper abuts against the first end, and a thickness of the stopper 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.

9. The lancet according to claim 1, wherein a scale for indicating a position of the adjustment ring is provided on an outer circumferential surface of the adjustment ring along a circumferential direction of the adjustment ring to correlate a length of the lancet tip protruding from the limit cap at the ejection position.