CN113598765A

CN113598765A - Blood sampling pen

Info

Publication number: CN113598765A
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: 2021-11-05
Anticipated expiration: 2041-07-27
Also published as: CN113598765B

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 is provided with an initial position and an ejection position. The pen cap is detachably connected with the pen body assembly. The limiting cap 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, the adjusting ring is adjustable in position in the circumferential direction of the pen cap to drive the limiting cap to translate along the front-back direction, and therefore 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.

Description

Blood sampling pen

Technical Field

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

Background

A blood taking pen is a medical blood taking device and comprises a blood taking needle for taking blood, and various adjusting schemes are provided in the related art for adjusting the exposed length of the needle head of the blood taking needle during blood taking, but various problems still exist in the related art.

Disclosure of Invention

The present invention is based on the discovery and recognition by the inventors of the following facts and problems:

in the related art, in order to adjust the exposed length of the needle 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; another kind of regulative mode is rotatory adjustable ring, makes adjustable ring translation around, but when adjustable ring translated forward, the gap that can appear grow gradually between its and the barrel of blood sampling pen, and this gap is hidden dirty easily, influences the use of blood sampling pen.

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

The blood sampling pen according to the embodiment of the invention comprises: 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 adjusting ring, the rear end cover of adjusting ring is established on the cap for brush just the front end cover of adjusting ring is established on the rear end of spacing cap, the adjusting ring is in the adjustable in order to drive of position in the circumference of cap for brush spacing cap is along the fore-and-aft direction translation, thereby adjusts the needle point of blood taking needle is in the jet-out position is followed the length that the front end of spacing cap stretches out.

According to the blood sampling pen provided by the embodiment of the invention, the exposed length of the needle head of the blood sampling needle 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 exposed length of the needle head of the blood sampling needle 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 of the limiting cap which can be translated in the front-back direction is larger, so that the blood sampling pen provided by the embodiment of the invention has more adjusting gears. And, rotatory adjustable ring makes the translation around the spacing cap, can not make blood sampling pen appear the gap in the outward appearance to avoid the gap to hide dirty problem, but make blood sampling pen have more excellent practicality.

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 fitted 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 limiting strip, the outer peripheral wall of the pen cap is provided with a limiting groove extending along the circumferential direction of the pen cap, and the limiting strip is fitted in the limiting groove and is slidable 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, the inner circumferential wall of the adjusting ring is provided with a fixture block, the outer circumferential wall of the pen cap is provided with a fixture table, the fixture block and the fixture table are opposite in the circumferential direction of the pen cap, and the fixture block abuts against the fixture table when the adjusting ring rotates by a predetermined angle so as to limit the front limit position of the limiting cap.

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

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

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

In some embodiments, the outer wall surface of the front end of the inner core is provided with a sliding groove, 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 a groove bottom of the sliding groove in the circumferential direction of the inner core to limit the sliding block to be separated from the groove bottom, a rear end of the limiting block is connected with a front end of the sliding block, the limiting portion is located in front of the sliding groove, a rear end face of the limiting portion is a portion of a 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 a thickness of the limiting portion in the radial direction of the inner core is gradually reduced from the first end to the second end in the circumferential direction of the inner core.

In some embodiments, the outer circumferential surface of the adjusting ring is provided with a scale along the circumferential direction of the adjusting ring for indicating the position of the adjusting ring to correlate the length of the needle tip of the blood collection needle protruding from the stopper cap at the injection position.

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 first cross-sectional view of a lancet according to an embodiment of the 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 I of a lancet according to an embodiment of the invention.

FIG. 8 is a second partial schematic view of a lancet according to an embodiment of the invention.

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

Fig. 10 is a schematic view 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 of a third embodiment in accordance with the invention.

Fig. 12 is a partial schematic diagram of a fourth embodiment in accordance with the invention.

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

FIG. 14 is a schematic view of an adjustment 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 pen cap according to an embodiment of the present invention.

FIG. 17 is a schematic view of a pen cap and a retaining cap according to an embodiment of the present invention.

FIG. 18 is a partial schematic view of a fifth lancet according to an embodiment of the invention.

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

Reference numerals:

1. a blood sampling pen; 11. a barrel; 111. opening a hole; 112. a cylinder sleeve; 113. a firing spring mounting sleeve; 12. a launch key; 121. a pressing section; 13. an inner core; 131. a first opening; 132. a second opening; 133. a sliding groove; 134. a limiting part; 1341. a first end; 1342. a second end; 135. a flange; 136. a notch; 14. a needle frame; 141. an elastic claw; 15. a blood collection needle; 151. a needle tip; 16. a firing spring; 171. a push-pull rod; 1711. a step; 1712. a card slot; 172. a tail cap; 1721. a tail cap sleeve; 1722. a tail cap core; 1723. a latch; 1724. a core sleeve; 1725. a push rod; 173. a tail cap spring; 18. a push-pull rod spring; 191. a pen cap; 1911. a protrusion; 1912. a limiting groove; 1913. clamping a platform; 1914. a step surface; 1915. a slider; 1916. a limiting block; 192. a limiting cap; 1921. an external thread; 193. an adjusting ring; 1931. a groove; 1932. a limiting strip; 1933. a clamping block; 1934. an internal thread; 20. withdrawing the needle protective sleeve; 210. a top rod; 220. a ring body; 230. a stopping part; 21. and 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 with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A lancet 1 according to an embodiment of the present invention is described below with reference to fig. 1 to 19. As shown in FIG. 3, the blood collection pen 1 includes a pen body assembly, a blood collection needle 15, a pen 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, in which the lancet 15 is forwardly fired, to an ejection position, which is a forward limit position of the lancet 15. The cap 191 is detachably connected to the pen body assembly, i.e. the cap 191 may be detached from the pen body assembly. The limiting 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 distal end of the stopper cap 192, and blood can be collected.

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 limiting cap 192. An adjusting ring 193 is positionally adjustable in the circumferential direction of the cap 191 to drive the stopper cap 192 to translate in the forward and backward directions, 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 adjusting ring 193 is rotated in the circumferential direction of cap 191, adjusting ring 193 may drive stopper cap 192 to translate in the forward and backward direction, and the translation of stopper cap 192 in the forward and backward direction may adjust the length of needle point 151 of blood lancet 15 protruding from the front end of stopper cap 192 when blood lancet 15 is at the forward limit position (ejection position).

The blood sampling pen 1 according to the embodiment of the invention realizes the adjustment of the exposed length of the needle of the blood sampling needle 15 during blood sampling by rotating the adjusting ring 193, the needle 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 exposed length of the needle of the blood sampling needle 15 from the front end of the limiting cap 192 during blood sampling. The rotating adjusting ring 193 enables the limiting cap 192 to move forwards in a translation mode, the exposed length of the needle head of the blood taking needle 15 during blood taking is made to be small, the rotating adjusting ring 193 enables the limiting cap 192 to move backwards, the exposed length of the needle head of the blood taking needle 15 during blood taking is made to be long, and the adjusting process is simple and convenient. The limiting cap 192 is sleeved at the front end of the pen cap 191, and the distance of the limiting cap 192 capable of translating in the front-back direction is larger, so that the blood sampling pen 1 provided by the embodiment of the invention has more adjusting gears. And, the rotation of the adjusting ring 193 enables the limiting cap 192 to move back and forth, so that a gap does not appear in the appearance of the blood sampling pen 1, the problem of dirt hiding in the gap is avoided, and the blood sampling pen 1 has better practicability.

As shown in fig. 13, the outer peripheral wall of the cap 191 is provided with a protrusion 1911, the inner peripheral wall of the adjustment ring 193 is provided with a plurality of grooves 1931 spaced along the circumferential direction of the adjustment ring 193, and the protrusion 1911 is selectively fitted into 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 may be selectively fitted into the groove 1931, and the adjustment ring 193 may not be rotated in a natural state due to the fitting of the protrusion 1911 and the groove 1931.

Alternatively, a scale for indicating the position of adjustment ring 193 to relate the length of needle tip 151 of blood lancet 15 protruding from stopper cap 192 in the ejection position is provided on the outer circumferential surface of adjustment ring 193 along the circumferential direction of adjustment ring 193. That is, the scale is provided on the outer circumferential surface of the adjusting ring 193, and the scale plays a role of indicating the position (rotation angle) of the adjusting ring 193, so that the length of the needle point 151 of the lancet 15 protruding from the stopper cap 192 at the injection position can be related, and the adjustment by the user is facilitated.

Further, as shown in fig. 15, the inner peripheral wall of the adjusting ring 193 is provided with a limit strip 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 strip 1932 is fitted in the limit groove 1912 and slidable along the circumferential direction of the cap 191 so as to limit the adjusting ring 193 to move back and forth relative to the cap 191. That is, the adjusting ring 193 does not slide in the front-rear direction by the cooperation of the stopper bar 1932 and the stopper groove 1912, and since the stopper bar 1932 is slidable in the circumferential direction of the cap 191, the stopper bar 1932 also functions as a guide for guiding the adjusting ring 193 to rotate in the circumferential direction of the cap 191.

The inner peripheral wall of the adjusting ring 193 is provided with a latch 1933, the outer peripheral wall of the cap 191 is provided with a catch 1913, the latch 1933 is opposite to the catch 1913 in the circumferential direction of the cap 191, and the latch 1933 stops against the catch 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 arrangement of the latch 1933 and the catch 1913 limits the maximum rotational 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 the latch 1933 stops against the catch 1913. The arrangement prevents the limiting cap 192 from sliding forwards 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 screwed to the stopper cap 192, an external thread 1921 is provided on the outer circumferential surface of the stopper cap 192, and an internal thread 1934 that engages with the external thread 1921 is provided on the inner circumferential surface of the adjusting ring 193. In other embodiments, the outer circumferential surface of the stopper cap 192 may be provided with an internal thread 1934, and the inner circumferential surface of the adjusting ring 193 is provided with an external thread 1921 matching the internal thread 1934. The internal threads 1934 cooperate with the external threads 1921 such that rotation of the adjustment ring 193 causes the limit cap 192 to move back and forth.

As shown in fig. 17, a step surface 1914 for abutting against the stopper cap 192 to define a rear limit position of the stopper cap 192 is formed on the outer peripheral wall of the cap 191. As the limit cap 192 moves rearward to the rearward limit, the step surface 1914 abuts the rearward end of the limit cap 192 to limit the limit cap 192 from continuing to move rearward. That is, the movement of the stopper cap 192 in the forward and backward direction is not limitless, and the distance between the forward limit position and the backward limit position of the stopper cap 192 is the maximum distance of the forward and backward movement of the stopper cap 192, and is also the difference between the maximum length and the minimum length exposed when the needle of the lancet 15 takes blood.

As shown in FIG. 3, the pen body assembly includes a barrel 11, a plunger 13, a needle holder 14 and a firing spring 16. The plunger 13 is disposed in the cylinder 11 and the front end of the plunger 13 protrudes from the front end of the cylinder 11. The rear end of the pen cap 191 is detachably connected with the front end of the inner core 13, and the rear end of the pen cap 191 abuts against the front end of the barrel body 11. A needle holder 14 is provided in the inner core 13, and a lancet 15 is mounted in the needle holder 14. A firing spring 16 is disposed within the barrel 11 and rests between the barrel 11 and the needle holder 14, the firing spring 16 serving to urge the needle holder 14 forwardly. The needle frame 14 can drive the blood taking needle 15 to shoot forwards under the pressure of the shooting spring 16.

In order to detachably connect the rear end of the cap 191 to the front end of the core 13, in the present embodiment, as shown in fig. 18, a sliding groove 133 is provided on an outer wall surface of the front end of the core 13, the sliding groove 133 has a front side wall and a rear side wall extending in a circumferential direction of the core 13, the sliding groove 133 has an opening facing the circumferential direction of the core 13, a sliding block 1915 is provided on an inner wall surface of the cap 191, and the sliding block 1915 enters from the opening of the sliding groove 133 and fits in the sliding groove 133 to restrict the cap 191 from moving forward and backward relative to the core 13. When the cap 191 is mounted to the front end of the inner core 13, the cap 191 is moved forward and backward relative to the inner 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 inner core 13, and then the cap 191 is rotated to slide the sliding block 1915 in the circumferential direction of the inner 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 in the front-rear direction with respect to the inner core 13.

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 part 1916, and the limiting part 1916 abuts against the limiting part 134 in the circumferential direction of the pen cap 191 to limit the pen cap 191 to rotate relative to the inner core 13. That is, when the cap 191 is coupled to the inner core 13, the stopper 1916 abuts against the stopper portion 134 in the circumferential direction of the cap 191, and the stopper portion 134 restricts the rotation of the stopper 1916 relative to the inner core 13, that is, the rotation of the cap 191 relative to the inner core 13 in the circumferential direction of the inner core 13. In summary, the engagement between the sliding block 1915 and the sliding groove 133 and the engagement between the stopper portion 134 and the stopper 1916 limit the cap 191 and the core 13 from each other in the front-rear direction and in the circumferential direction, and the cap 191 is thereby connected to the core 13.

It will be appreciated that the cap 191 may be removed from the plunger 13 by applying a force to the cap 191 to rotate it in the opposite direction and then pull it forward, thereby disengaging the stop portion 134 from the stop 1916 and the slide block 1915 from the slide groove 133.

As an example, in the present embodiment, as shown in fig. 18, when the cap 191 is coupled to the front end of the inner core 13, the sliding block 1915 abuts against the groove bottom of the sliding groove 133 in the circumferential direction of the inner 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 abuts against the stopper 134 to restrict the sliding movement of the sliding block 1915 along the circumferential direction of the inner core 13 from coming off the groove bottom. The structure of the blood sampling pen 1 is more reasonable due to the arrangement.

As shown in fig. 19, the rear end of the stopper 1916 is connected to the front end of the sliding block 1915, the stopper 134 is located in front of the sliding groove 133, and the rear end surface of the stopper 134 is a part 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 limiting portion 134 has a first end 1341 and a second end 1342 in the circumferential direction of the inner core 13, when the cap 191 is connected to the inner core 13, the limiting block 1916 abuts against the first end 1341, and 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 cap 191 is rotatably mounted, the limiting block 1916 conveniently slides along the limiting portion 134 in the circumferential direction until abutting against the first end 1341. When the cap 191 is rotatably attached, the stopper 1916 slides on the outer wall surface of the stopper 134 from the second end 1342 to the first end 1341 of the stopper 134 in the circumferential direction, and when the stopper 1916 slides to the first end 1341, the stopper 1916 moves inward to be caught at the first end 1341 (stops at the first end 1341) by the self-elasticity of the cap 191.

As shown in FIG. 3, the lancet 1 further comprises a launch key 12. An opening 111 is provided on the peripheral wall of the cylinder 11, and the launch key 12 is fitted in the opening 111 and is movable between a first position and a second position in the radial direction of the cylinder 11. The launch key 12 has a push portion 121 extending inwardly of the barrel 11. The inner core 13 is arranged in the cylinder body 11, the front end of the inner core 13 extends out of the front end of the cylinder body 11, and the peripheral wall of the inner core 13 is provided with a first opening 131. The needle frame 14 is provided in the inner core 13, the needle frame 14 is provided with elastic claws 141, and the lancet 15 is mounted in the needle frame 14. A firing spring 16 is disposed within the barrel 11 and rests between the barrel 11 and the needle holder 14, the firing spring 16 serving to urge the needle holder 14 forwardly. 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 forward movement of the needle frame 14, 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 frame 14 to drive the blood collection needle 15 to shoot forwards under the pressure of the shooting spring 16.

When the blood sampling pen 1 is used, the emission key 12 is pressed inwards along the radial direction of the barrel body 11, so that the emission key 12 moves from the first position to the second position, in 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 in the inner core 13, so that the elastic claw 141 moves from the stopping position stopped by the inner core 13 to the disengaging position disengaged from the stopping position of the inner core 13, and after the elastic claw 141 disengages from the stopping position of the inner core 13, the needle frame 14 is pressed forwards by the emission spring 16, and the needle frame 14 is ejected forwards along the axial direction of the blood sampling pen 1. And simultaneously the lancet 15 mounted in the needle frame 14 is launched forward, thereby completing the blood sampling 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 shoot forwards by pressing the shooting key 12, so that the blood sampling function is realized. The pushing part 121 of the firing key 12 pushes the elastic claw 141 on the needle frame 14 inwards, so that the elastic claw 141 is separated from the stop of the inner core 13 and is fired forwards under the pressure of the firing 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 shoot key 12, an inner core 13, a needle holder 14, a lancet 15, and a shoot spring 16.

The inner core 13 is arranged in the cylinder body 11, the front end of the inner core 13 extends out of the front end of the cylinder body 11, and the inner core 13 and the cylinder body 11 are fixed with each other. The opening 111 of the barrel 11 is opposite to the first opening 131 of the inner core 13 in the radial direction of the barrel 11, the launch key 12 extends outwards from the opening 111 of the barrel 11, and a part of the launch key 12 protrudes outwards relative to the outer circumferential wall of the barrel 11, so that the launch key can be pressed conveniently. The needle park 14 is arranged inside the plunger 13 such that the front end of the needle park 14 is flush or substantially flush with the front end of the plunger 13 when the needle park 14 is not fired forwardly, i.e. when the needle park 14 is in a ready-to-fire condition, as shown in figure 3. It will be appreciated that when the needle holder 14 is forwardly fired, the needle holder 14 slides forwardly relative to the plunger 13, and the front end of the needle holder 14 projects from the front end of the plunger 13. The rear end of the striking 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 position in which needle carrier 14 is to be fired, firing spring 16 is in a compressed state. Optionally, the needle frame 14 and the inner core 13 are limited in the circumferential direction of the inner core 13, so that the needle frame 14 can only slide in the front-back direction relative to the inner core 13, the needle frame 14 and the blood taking needle 15 can be launched more stably, and the needle frame 14 is prevented from rotating when being launched forwards to influence the blood collecting effect.

The free end of the elastic claw 141 of the needle holder 14 is the front end thereof, and when the launch key 12 is located 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, so that the needle holder 14 is stopped from moving forward. When the pushing portion 121 of the shoot key 12 pushes the free end of the elastic claw 141 inwards by pressing the shoot key 12 inwards, the free end of the elastic claw 141 is disengaged from the stop of the front wall of the first opening 131, that is, the inner core 13 loses the stop function of the needle holder 14, and the needle holder 14 drives the blood collection needle 15 to shoot forwards under the action of the shoot spring 16.

As shown in FIG. 3, the front end of the lancet 15 is a needle tip 151, and the rear end of the lancet 15 is inserted from the front end of the needle holder 14. Alternatively, a protrusion is formed on the inner circumferential wall of the needle frame 14, a groove corresponding to the protrusion is formed on the outer circumferential wall of the lancet 15, the lancet 15 is loaded into the front end of the needle frame 14 from front to back until the protrusion of the needle frame 14 is fitted into the groove, the lancet 15 and the needle frame 14 are thereby restrained from each other, and the lancet 15 is mounted 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, and the blood collection needle 15 can be detached from the needle holder 14 after use to replace a new blood collection needle 15, so that the blood collection pen 1 provided in this embodiment can be reused, and only the blood collection needle 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 frame 14 is shot forward to the front limit position, the free ends of the elastic claws 141 extend into the second opening 132 and abut against the wall of the second opening 132. That is, the second opening 132 functions to limit the front limit position of the needle frame 14. The forward limit position of the needle park 14 is the limit position when the needle park 14 is fired forward. Specifically, when needle holder 14 is shot forward, elastic claw 141 is disengaged from the front wall of first opening 131 and moves forward, and when the free end of elastic claw 141 is opposite to second opening 132 in the radial direction of inner core 13, because elastic claw 141 has elasticity, its free end will protrude from second opening 132, needle holder 14 continues to be shot forward, and the free end of elastic claw 141 will stop against the front wall of second opening 132, so that inner core 13 stops needle holder 14 again, and even if at this time shooting spring 16 still presses needle holder 14 forward, needle holder 14 will not slide forward any more, and needle holder 14 reaches its front limit position.

As shown in FIG. 3, the blood collection pen 1 further comprises 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 stopped against the inner core 13, the rear end of the needle withdrawing spring 21 is stopped against the needle frame 14, and the needle frame 14 gradually compresses the needle withdrawing spring 21 when the needle frame 14 is shot forwards. After the needle carrier 14 moves forward to the front extreme position, the needle withdrawing spring 21 pushes the needle carrier 14 to move backward to retract the needle tip 151 of the blood lancet 15 backward. That is to say, when needle frame 14 moves forward to the extreme position, the syringe needle of blood taking needle 15 also reaches preceding extreme position, moves back needle spring 21 this moment and oppresses needle frame 14 backward, and needle frame 14 moves backward under the oppression of moving back needle spring 21 to drive the needle point 151 of blood taking needle 15 and move backward, thereby the syringe needle of blood taking needle 15 that has avoided having launched leaks and causes the accidental injury accident, the blood taking pen 1 that this application provided has the high advantage of security.

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 withdrawing assembly is used to separate the lancet 15 from the needle frame 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 in the cylinder 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 forwards to move forwards, the tail cap 172 drives the push-pull rod 171 to move forwards, the front end of the push-pull rod 171 moves forwards in the needle frame 14 relative to the needle frame 14, the front end of the push-pull rod 171 pushes the rear end of the blood taking needle 15 forwards, 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 forwards to separate from the needle frame 14. A tail cap spring 173 is provided in the barrel 11, the tail cap spring 173 stopping between the barrel 11 and the tail cap 172, the tail cap spring 173 for pressing 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 barrel 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 original position by the tail cap spring 173 when the forward pushing force applied to 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 movably fitted in the rear end of the cylinder 11 in the front-rear direction, and the rear end of the tail cap 1721 protrudes from the rear end of the cylinder 11. The tail cap core 1722 is installed in the tail cap sleeve 1721, the tail cap core 1722 and the tail cap sleeve 1721 are limited in the front-back direction, and when the back end of the tail cap sleeve 1721 is pushed forwards, the tail cap sleeve 1721 drives the tail cap core 1722 to move forwards. The rear end of the tail cap spring 173 is stopped 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 a rear end of the tail cap core 1722 and a 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 abuts 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 latching 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 vertical surface of the step 1711 is located in front of and against the front end surface of the rear end of the tail cap core 1722 to stop the push-pull rod 171 from moving backward relative to the tail cap core 1722. Therefore, the push-pull rod 171 and the tail cap core 1722 are limited 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 of the push-pull rod spring 18 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 is moved backward by the tail cap spring 173, and the push-pull rod 171 gradually compresses the push-pull rod spring 18. When the forward force of the push-pull rod spring 18 on the push-pull rod 171 and the backward force of the tail cap spring 173 on the push-pull rod 171 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 move rearward can be avoided. If the push-pull rod 171 moves backward too much, the front end of the push-pull rod 171 may easily interfere with 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 contact the rear end of the lancet 15, so that the needle withdrawing assembly can eject the lancet 15 forward more quickly when withdrawing the needle.

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 with the opening facing forward. The rear end of the launching spring 16 is positioned in the launching spring mounting sleeve 113 and abuts against the rear end of the launching spring mounting sleeve 113, and the front end of the launching spring 16 abuts against the needle frame 14. The front end of the tail cap spring 173 abuts against the rear end of the discharge spring mounting sleeve 113. The rear end of the push-pull rod spring 18 is located in the launching spring mounting sleeve 113 and abuts against the rear end of the launching spring mounting sleeve 113. Illustratively, as shown in FIG. 3, the rear end of firing spring 16 extends into firing spring mounting sleeve 113 from the front opening of firing spring mounting sleeve 113 and abuts the rear end of firing spring mounting sleeve 113, and the rear end of firing spring 16 abuts the rear end of 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, and optionally the firing spring 16 is sleeved with the push-pull rod spring 18. The tail cap spring 173 is located behind the discharge spring mounting sleeve 113, and the front end thereof abuts against the rear end surface of the rear end of the discharge spring mounting sleeve 113.

As shown in fig. 11 and 12, the lancet 1 further comprises a needle-withdrawing 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 withdrawing protective sleeve 20 is used for avoiding the needle withdrawing operation by mistake. When the protective cap is not detached from the inner core 13, the front end of the needle withdrawing sheath 20 abuts against the rear end of the protective cap, and the rear end of the needle withdrawing sheath 20 abuts against the front end of the tail cap 172, so that the tail cap 172 cannot slide forward even if a forward force is applied to the tail cap 172, and the push-pull rod 171 cannot push the lancet 15 forward to perform the needle withdrawing operation. When the protective cap is detached from the inner core 13, the needle withdrawing protective sleeve 20 is no longer limited by the protective cap, and the tail cap 172 can be moved forward by applying a pushing force to the tail cap 172, and the push-pull rod 171 can push the blood taking needle 15 to complete needle withdrawing because the tail cap 172 can move forward.

The blood sampling pen 1 provided by the embodiment of the invention comprises the needle withdrawing protective sleeve 20 which plays a role in needle withdrawing protection, and when the protective cap is connected with the inner core 13, the needle withdrawing protective cap can prevent the tail cap 172 from moving forwards, so that the occurrence of a needle withdrawing accident by mistake is avoided, and therefore, the blood sampling pen 1 provided by the embodiment of the invention has the advantage of high safety.

Further, the tail cap core 1722 comprises 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, the two push rods 1725 are opposite to each other in the radial direction of the tail cap core 1722, and the two push rods 210 are in one-to-one correspondence with the push rods 1725, so that the resisting action 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, both the rear end surface of the jack 210 and the front end surface of the pushrod 1725 are inclined surfaces. When the tail cap 172 moves forward, the rear end surface of the ejector rod 210 slides relative to the front end surface of the push rod 1725 to rotate the needle withdrawing protective sleeve 20, so that the push rod 1725 is separated from the ejector rod 210. That is, 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 both inclined surfaces, the rear end surface of the push rod 210 slides relative to the front end surface of the push rod 1725, so that the needle withdrawing protective sleeve 20 rotates, and the needle withdrawing protective sleeve 20 rotates to enable the push rod 1725 to be separated from the push rod 210, i.e. the needle withdrawing protective sleeve 20 is separated from the tail cap 172. The trailing cap 172 continues to move forward and the needle retraction sheath 20 is no longer moved forward due to the disengagement of the trailing cap 172.

As shown in fig. 11 and 12, the needle withdrawing protective sleeve 20 comprises a ring body 220 and a stop part 230 connected with the ring body 220 and extending forwards, wherein the ring body 220 is sleeved on the inner core 13. The ejector rod 210 is connected with the ring body 220 and extends backwards, the outer peripheral wall of the inner core 13 is provided with a flange 135, 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 stopping portion 230 is located in the notch 136, the front end of the flange 135 and the front end of the stopping 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 needle withdrawing protective sleeve 20 is abutted against the rear end of the protective cap by the stopping 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 for 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 to be separated 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 withdrawing protective sleeve 20 rotates relative to the inner core 13, and in order to better guide the rotation of the needle withdrawing protective sleeve 20, as shown in fig. 12, at least a part of at least one side surface of the stopping portion 230 is an inclined surface, and when the tail cap 172 moves forward to rotate the needle withdrawing protective sleeve 20, the flange 135 slides relative to the inclined surface, so that the needle withdrawing protective sleeve 20 can rotate along a designated path until the flange 135 stops against the ring body 220, which improves the structural rationality of the lancet 1.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.

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

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A lancing pen, comprising:

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 adjustable ring, the rear end cover of adjustable ring is established on the cap for brush just the front end cover of adjustable ring is established on the rear end of spacing cap, the adjustable ring is in the adjustable in order to drive of position in the circumference of cap for brush spacing cap is along the fore-and-aft direction translation, thereby adjusts the needle point of blood taking needle is in the jet-out position is followed the length that the front end of spacing cap stretches out.

2. The lancing pen according to claim 1, wherein a protrusion is provided on an outer peripheral wall of the cap, a plurality of grooves are provided on an inner peripheral wall of the adjustment ring at intervals in a circumferential direction of the adjustment ring, and the protrusion selectively fits in the groove when the adjustment ring is rotated relative to the cap.

3. The blood collection pen according to claim 2, wherein the inner peripheral wall of the adjusting ring is provided with a limiting strip, the outer peripheral wall of the pen cap is provided with a limiting groove extending along the circumferential direction of the pen cap, and the limiting strip is fitted in the limiting groove and is slidable 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 collection pen according to claim 2, wherein the inner peripheral wall of the adjusting ring is provided with a fixture block, the outer peripheral wall of the pen cap is provided with a fixture table, the fixture block and the fixture table are opposite in the circumferential direction of the pen cap, and the fixture block abuts against the fixture table when the adjusting ring rotates by a predetermined angle to define the front limit position of the limit cap.

5. The lancing device according to any one of claims 1 to 4, wherein an external thread is provided on an outer circumferential surface of the cap, and an internal thread which is engaged with the external thread is provided on an inner circumferential surface of the adjusting ring.

6. The lancing pen according to claim 5, wherein a step surface for abutting against the cap to define a rear limit position of the cap is formed on the outer peripheral wall of the cap.

7. The lancing pen of claim 1, wherein the pen body assembly comprises:

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

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 barrel body and is stopped against between the barrel body and the needle frame to be used for forwardly pressing the needle frame.

8. The blood collection pen according to claim 7, wherein a sliding groove is provided on an 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 in the 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 pen cap, the sliding block enters from the opening of the sliding groove and fits in the sliding groove to restrict the pen 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.

9. The blood collection pen according to claim 8, wherein the sliding block abuts against a groove bottom of the sliding groove in a circumferential direction of the inner core when the stopper abuts against the stopper portion to restrict the sliding block from being separated from the groove bottom, a rear end of the stopper is connected to a front end of the sliding block, the stopper portion is located in front of the sliding groove, a rear end surface 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 a radial direction of the inner core is gradually reduced from the first end toward the second end in the circumferential direction of the inner core.

10. The lancet according to claim 1, wherein a scale for indicating a position of the adjusting ring to relate a length of the needle tip of the lancet protruding from the cap at the shot position is provided on an outer circumferential surface of the adjusting ring in a circumferential direction of the adjusting ring.