WO2023273187A1

WO2023273187A1 - Lancing pen

Info

Publication number: WO2023273187A1
Application number: PCT/CN2021/137414
Authority: WO
Inventors: 王炜; 姚费杰; 王丽江
Original assignee: 杭州安诺凯医疗科技有限公司
Priority date: 2020-07-01
Filing date: 2021-12-13
Publication date: 2023-01-05
Also published as: CN215191590U; CN113288139A

Abstract

A lancing pen, comprising a needle exiting portion (10) and a pen body portion. The needle exiting portion (10) comprises a connecting structure and a telescopic structure, the telescopic structure is axially telescopically mounted on the connecting structure, and cavities in the needle exiting portion (10) and the pen body portion are kept airtight. According to the lancing pen, the structure is reliable, good air tightness is achieved, connection of a blood sampling area is more stable, the structure is modularized, production and assembly are simple, the needle exiting depth of a blood sampling needle in a peripheral blood sampling process is accurately controlled, and pain in the blood sampling process is effectively reduced.

Description

a blood collection pen

technical field

The invention relates to the technical field of medical blood collection equipment, in particular to a blood collection pen.

Background technique

The blood collection pen is a pen-shaped blood collection device that is used in conjunction with a disposable sterile blood collection needle to collect peripheral blood samples from the human body. The so-called peripheral blood collection is to use a blood collection pen to puncture areas with rich peripheral blood supply such as fingertips, pierce the skin, and obtain peripheral blood. The amount of blood taken is not large.

But, because the end points such as fingertips are all nerve-enriched sensitive areas, the puncture of the blood collection point at the end of the existing blood collection pen will cause strong pain. The common blood collection pens on the market all have a depth-adjusting structure, which can be adjusted during blood collection to find a suitable needle depth to relieve the pain of peripheral blood collection. However, the needle depth and needle force of the general adjustment method are unstable. Market research shows , Adjusting the depth of the blood collection pen shows an unstable state in pain control, that is, sometimes the pain is relieved, and sometimes it is not relieved. Moreover, when the existing blood collection pen is used, the connection with the blood collection area is unstable, resulting in unsuccessful blood collection or expanding the puncture surface, increasing pain, the overall structure is not reliable enough, and the production and assembly of the product is relatively inconvenient. In addition, ordinary blood collection pens generally use spring force as the driving force. During the blood collection process, the internal locking element and the external pushing part are connected together to move synchronously. When released, the internal locking element will be resisted by the external pushing device. The utilization rate of the spring force is reduced, and it is also easy to cause interference.

Contents of the invention

The present invention solves the problems of the prior art and provides a blood collection pen with reliable structure and good airtightness, which can accurately control the needle exit depth of the blood collection needle in the process of peripheral blood collection, and effectively reduce the pain generated during the blood collection process.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A blood collection pen, comprising a needle outlet and a pen body, the needle outlet includes a connection structure and a telescopic structure, the telescopic structure can be axially telescopically installed on the connection structure, and the inner cavity of the needle outlet and the pen body maintains air Tightness. During use, the whole blood collection pen always maintains a certain degree of airtightness.

As a preference, the connecting structure includes a connecting cylinder a, the telescopic structure includes a telescopic block a and an adjustable front cover, the inner wall of the front part of the connecting cylinder a is provided with a guide cylinder a, the side wall of the guide cylinder a is provided with a bump a, and the outer side of the rear part There is a limit convex ring, the outer wall of the limit convex ring is provided with a protrusion, and the inner wall of the rear end of the adjustment front cover is provided with a corresponding groove, the rear end of the telescopic block a is located between the limit convex ring and the middle cylinder and the front end protrudes Adjust the front cover, and adjust the front cover. There are a number of limit guide strips distributed in the inner side of the front part, and a number of limit guide grooves are distributed in the front part of the telescopic block a. The telescopic block a is provided with a chute a and a protrusion a into the chute a. Adjust the front cover to be rotatably set on the limit protrusion ring of the connecting cylinder a, turn and adjust the front cover, and the telescopic block a will rotate synchronously. In this process, the limit guide bar and the limit guide groove play the role of circumferential limit and axial guidance.

Preferably, at least one notch is provided at the rear end of the telescopic block a, an elastic block is provided in the notch, a positioning protrusion a is provided on the outside of the elastic block, and a certain number of continuously distributed positioning grooves a are provided on the inner wall of the limiting convex ring. The positioning protrusion a and the positioning groove a play the role of positioning and anti-rotation. The positioning groove a is in the shape of an axial strip. Under normal conditions, the positioning protrusion a is located in one of the positioning grooves a. Adjust the front cover and the telescopic block After a rotates, under the action of the elastic block, the positioning protrusion a moves circumferentially to another positioning groove a, and at the same time, the axial position of the positioning protrusion a in the positioning groove a changes.

As a preference, marks are provided on the rear cylinder of the connecting cylinder a and the outer wall of the adjustment front cover. The mark is used to indicate the adjusted depth position, which can be through text, arrows or scales of different lengths.

Preferably, the front end of the telescopic block a is provided with an apron installation groove, and an apron is provided in the apron installation groove. The apron is the pressing part that is in direct contact with the blood collection area. It is made of medical silicone injection molding. Its function is to increase the airtightness of the connection between the skin of the blood collection area and the blood collection pen.

Preferably, a sealing ring is provided between the guide cylinder a and the telescopic block a to increase the airtightness of the structure.

Preferably, a certain number of guide ribs are distributed circumferentially on the inner wall of the front end of the telescopic block a, and the inner ends of the guide ribs are opposed to the outer wall of the front end of the connecting cylinder a to play the role of position-limiting guides. A number of gaps are evenly distributed on the limiting convex ring, so that the limiting convex ring has a certain deformation ability, which is convenient for adjusting the disassembly and assembly of the front cover.

Preferably, the connecting structure includes a connecting cylinder b, the telescopic structure includes a telescopic block b, the front inner wall of the connecting cylinder b is provided with a bump b, the telescopic block b is made of flexible material, and the outer wall is provided with a chute b. The rigid connecting cylinder b and the flexible telescopic block b are assembled together to have a certain degree of airtightness. When the telescopic block b is rotated, under the action of the protrusion b and the chute b, the telescopic block b can be axially displaced.

Preferably, the inner wall of the front part of the connecting cylinder b is provided with a positioning protrusion b, the inner wall of the rear side of the positioning protrusion b is provided with a guide ring, the rear outer wall of the telescopic block b is provided with a positioning groove b, and the rear end is provided with a ring groove . At least one of the positioning protrusion b and the positioning groove b is evenly distributed in the circumferential direction, and the cooperation of the two plays the role of positioning and anti-rotation. The guide ring covers the telescopic block b rear part and partially extends into the ring groove, which plays the role of guiding and improving airtightness.

Preferably, the connecting structure includes a connecting cylinder c, the telescopic structure includes a telescopic block c, the inner wall of the front part of the connecting cylinder c is provided with a guide cylinder b, the outer wall of the front end of the guide cylinder b is provided with a bump c, and the telescopic block c is made of flexible material, The inner wall of the middle front part is provided with a chute c. The rigid connecting cylinder c and the flexible telescopic block c are assembled together to have a certain degree of airtightness. When the telescopic block c is rotated, under the action of the protrusion c and the chute c, the telescopic block c can be axially displaced.

Preferably, the inner wall of the connecting cylinder c on one side of the guide cylinder b is provided with a positioning groove c, and the rear outer wall of the guide cylinder b is provided with a positioning protrusion c. At least one of the positioning protrusion c and the positioning groove c is evenly distributed in the circumferential direction, and the cooperation of the two plays the role of positioning and anti-rotation.

Preferably, the needle outlet part includes a connection structure and a telescopic structure, and the telescopic structure can be axially and telescopically installed inside the connection structure. The telescopic structure is completely hidden in the connecting structure, and the axial position in the connecting structure can be adjusted.

Preferably, the connecting structure includes a connecting cylinder d, the telescopic structure includes a telescopic block d, the inner wall of the connecting cylinder d is provided with an internal thread section, and the outer wall of the telescopic block d is provided with an external thread section. The connecting cylinder d and the telescopic block d are connected by threads, and the position of the telescopic block d is adjusted by rotation.

Preferably, the inner wall of the connecting cylinder d is provided with a positioning groove d in the circumferential direction, and one end of the telescopic block d is provided with a positioning protrusion d. The positioning groove d and the positioning protrusion d cooperate to play the role of positioning and anti-rotation

Preferably, the pen body part includes a main body part, a piston part inside the main body part and a push rod part for pushing the piston part. The main body includes a sleeve, and the side wall of the front end of the sleeve is provided with a button hole, and a button and a trigger are arranged in the button hole, a front connector is arranged in the sleeve on the front side of the trigger, and a rear end with a magnetic suction is arranged in the front connection The needle seat assembly of metal parts, the piston part includes the piston body and the elastic part that makes the piston body move to the rear guide cover side, the front end of the piston body is provided with a snap-fit structure that cooperates with the trigger, and the middle of the end surface is provided with a groove, the groove There is a magnetic steel inside, a piston ring groove on the outside, and a piston ring inside. The push rod part includes a rear guide cover at the rear end of the main body and a push rod that can move axially in the hole in the rear guide cover. The front end of the push rod It is a forward pushing block, the rear end is a pressing block, and the front end of the sleeve of the main body part is connected to the connection structure of the needle part.

The push rod part is not directly connected to the piston part. When necessary, push the push rod into the sleeve along the rear guide cover through the pressing block. The magnetic steel and the magnetic metal parts of the needle seat assembly are adsorbed together, the elastic part is deformed, and the push rod part can be separated from the piston part. Press the button, and the front end of the piston body is separated from the trigger. Under the action of the elastic part, the piston The main body quickly moves toward the direction of the rear guide cover. At the same time, under the action of the magnetic force, the needle seat of the needle seat assembly moves backward. When the piston body reaches a certain position at the rear end, the magnetic metal part is separated from the magnetic steel. Under the action of the spring, the needle seat ejects forward and quickly pulls back the needle seat to reset. Wherein, the front push block also plays a role in preventing the push rod from breaking away.

Preferably, a return spring is sleeved on the push rod between the rear guide cover and the pressing block. After the work is completed, the push rod automatically extends and resets without interfering with the piston.

Preferably, the sleeve is provided with an outer sleeve, the outer sleeve and the sleeve have a certain gap and are connected to the sleeve at the front end, the pressing block is provided with a pressing sleeve extending forward, and the front end of the pressing sleeve is inserted into the into the gap between the outer sleeve and the sleeve. The double-layer sleeve structure improves the structural strength, limits and guides the movement of the push rod when pressing, and can also realize the hiding of the edge part of the pressing block structure.

Preferably, the elastic member is a tension spring, and the rear end of the piston body and the inner end of the rear guide cover are respectively provided with connection structures of tension springs.

Preferably, the elastic member is a compression spring, a convex ring is provided on the inner wall of the sleeve on the rear side of the trigger, and a step is provided on the outer wall of the piston body, and the two ends of the compression spring are respectively opposed to the convex ring and the steps of the piston body. The protruding ring also plays a role in limiting the position of the main body of the piston to avoid its twisting.

The beneficial effects of the present invention are: 1. The blood collection pen of the present invention has a reliable structure and good air tightness, which makes the connection of the blood collection area more stable. The structure adopts modularization, and the production and assembly are simple. , effectively reduce the pain during the blood collection process, and the mechanical movement is completed by the internal needle seat assembly and the piston part during the blood collection process, and the external mechanism does not participate to avoid interference;

2. The piston of the present invention is not connected to the push rod, and the piston can obtain a faster sliding speed. When the spring releases the piston to create negative pressure, it will not be resisted by the push rod, thereby obtaining a better negative pressure effect.

Description of drawings

Fig. 1 is a perspective view of Embodiment 1 of the needle outlet part of the present invention;

Fig. 2 is a cross-sectional view of Embodiment 1 of the needle outlet part of the present invention;

Fig. 3 is a front view of the connecting cylinder a in Embodiment 1 of the needle outlet part of the present invention;

Fig. 4 is a perspective view of the connecting cylinder a in the first embodiment of the needle outlet of the present invention;

Fig. 5 is a cross-sectional view of the connecting cylinder a in Embodiment 1 of the needle outlet part of the present invention;

Fig. 6 is a perspective view of the telescopic block a in Embodiment 1 of the needle outlet part of the present invention;

Fig. 7 is a front view of the telescopic block a in Embodiment 1 of the needle outlet part of the present invention;

Fig. 8 is a cross-sectional view of the telescopic block a in Embodiment 1 of the needle outlet part of the present invention;

Fig. 9 is a perspective view of adjusting the front cover in Embodiment 1 of the needle outlet part of the present invention;

Fig. 10 is another perspective view of the adjusting front cover in Embodiment 1 of the needle outlet part of the present invention;

Fig. 11 is a perspective view of Embodiment 2 of the needle outlet part of the present invention;

Fig. 12 is a cross-sectional view of the second embodiment of the needle outlet of the present invention;

Fig. 13 is a perspective view of the connecting cylinder b in the second embodiment of the needle outlet part of the present invention;

Fig. 14 is a cross-sectional view of the connecting cylinder b in the second embodiment of the needle outlet part of the present invention;

Fig. 15 is a front view of the telescopic block b in Embodiment 2 of the needle outlet part of the present invention;

Fig. 16 is a cross-sectional view of the telescopic block b in the second embodiment of the needle outlet of the present invention;

Fig. 17 is a perspective view of Embodiment 3 of the needle outlet part of the present invention;

Fig. 18 is a cross-sectional view of the third embodiment of the needle outlet part of the present invention;

Fig. 19 is a perspective view of the connecting cylinder c in the third embodiment of the needle outlet part of the present invention;

Fig. 20 is a cross-sectional view of the connecting cylinder c in the third embodiment of the needle outlet part of the present invention;

Fig. 21 is a perspective view of the telescopic block c in Embodiment 3 of the needle outlet part of the present invention;

Fig. 22 is a cross-sectional view of the telescopic block c in Embodiment 3 of the needle outlet part of the present invention;

Fig. 23 is a cross-sectional view of Embodiment 4 of the needle outlet part of the present invention;

Fig. 24 is a cross-sectional view of the connecting cylinder d in the fourth embodiment of the needle outlet of the present invention;

Fig. 25 is a perspective view of the telescopic block d in Embodiment 4 of the needle outlet part of the present invention;

Fig. 26 is a perspective view of Embodiment 1 of the pen body part of the present invention;

Fig. 27 is a cross-sectional view of Embodiment 1 of the pen body part of the present invention;

Fig. 28 is a cross-sectional view of Embodiment 1 of the pen body part of the present invention;

Fig. 29 is a partial cross-sectional view of the main body in Embodiment 1 of the pen body of the present invention;

Fig. 30 is a cross-sectional view of the push rod part in Embodiment 1 of the pen body part of the present invention;

Fig. 31 is a perspective view of Embodiment 2 and Embodiment 3 of the pen body of the present invention;

Fig. 32 is a cross-sectional view of the second embodiment of the pen body of the present invention;

Fig. 33 is a cross-sectional view of Embodiment 3 of the pen body part of the present invention;

Fig. 34 is a cross-sectional view of the sleeve in the second embodiment and the third embodiment of the pen body of the present invention;

Fig. 35 is a cross-sectional view of the push rod part in the second embodiment and the third embodiment of the pen body part of the present invention.

In the figure: 10, needle outlet; 11, connecting cylinder a; 11.1, limit protrusion ring; 11.2, protrusion; 11.3, protrusion a; 11.4, positioning groove a; 11.5, guide cylinder a; 12, sealing ring ;13. Telescopic block a; 13.1. Limit guide groove; 13.2. Inclined groove a; 13.3. Elastic block; 13.4. Positioning protrusion a; 13.5. Apron installation groove; ; 14.1, groove; 14.2, limit guide strip; 15, rubber ring; 16, connecting cylinder b; 16.1, bump b; 16.2, positioning protrusion b; 16.3, guide ring; 17.2, positioning groove b; 17.3, ring groove; 18, connecting cylinder c; 18.1, guiding cylinder b; 18.2, bump c; 18.3, positioning groove c; 19, telescopic block c; Groove c; 19.2, positioning protrusion c; 110, connecting cylinder d; 110.1, internal thread segment; 110.2, positioning groove d; 111, telescopic block d; 111.1, external thread segment; 111.2, positioning protrusion d; 20, Main body; 21. Sleeve; 21.1. Button hole; 21.2. Protruding ring; 22. Button; 23. Trigger; 24. Front connector; 25. Needle seat assembly; 26. Rear guide cover; 27. Outer sleeve 30, piston part; 31, piston main body; 32, magnetic steel; 33, piston ring; 34, extension spring; 35, compression spring; 40, push rod part; 41, push rod; 42, front push block; 43, Pressing block; 44, return spring; 45, pressing sleeve; 100, identification.

detailed description

The present invention will be further described below through specific embodiments and accompanying drawings.

The embodiment is as follows: as shown in Figure 26, a blood collection pen includes a needle outlet part 10 and a pen body. The needle outlet part 10 includes a connection structure and a telescopic structure. The inner cavity of the needle part 10 and the pen body part keeps airtightness.

Embodiment 1 of the needle outlet part 10: as shown in Figure 1-2, the needle outlet part 10 includes a connection structure and a telescopic structure. Tightness.

As shown in Figure 3-10, the connection structure includes a connection cylinder a11, the telescopic structure includes a telescopic block a13 and an adjustable front cover 14, the front inner wall of the connection cylinder a11 is provided with a guide cylinder a11.5, and the side wall of the guide cylinder a11.5 is provided with There is a convex block a11.3, a limiting convex ring 11.1 is provided on the outer side of the rear part, a protrusion 11.2 is provided on the outer wall of the limiting convex ring 11.1, a corresponding groove 14.1 is provided on the inner wall of the rear end of the adjusting front cover 14, and the rear end of the telescopic block a13 is located Between the position-limiting convex ring 11.1 and the cylinder in the middle, and the front end stretches out to adjust the front cover 14, there are several space-limiting guide strips 14.2 distributed in the inner side of the front part of the front cover 14, and the front part of the telescopic block a13 is distributed with A number of limit guide grooves 13.1, and a chute a13.2 is opened on the telescopic block a13

Wherein, the front end of the telescopic block a13 is provided with an apron installation groove 13.5, and an apron 15 is provided in the apron installation groove 13.5, and a sealing ring 12 is provided between the guide cylinder a11.5 and the telescopic block a13.

As shown in Figure 3-8, at least one notch is provided at the rear end of the telescopic block a13, an elastic block 13.3 is provided in the notch, a positioning protrusion a13.4 is provided on the outer side of the elastic block, and a certain number of continuous gaps are provided on the inner wall of the limiting convex ring 11.1. Distribution of positioning grooves a11.4. Wherein, there are a certain number of guiding ribs 13.6 distributed circumferentially on the inner wall of the front end of the telescopic block a13, and there are several gaps evenly distributed on the limiting convex ring 11.1.

As shown in FIG. 1 , FIG. 3 and FIGS. 9-10 , a mark 100 is provided on the rear cylinder of the connecting cylinder a11 and the outer wall of the adjustment front cover 14 .

Embodiment 2 of the needle outlet part 10: as shown in Figure 11-16, the needle outlet part 10 includes a connection structure and a telescopic structure, the telescopic structure can be axially telescopically installed on the front end of the connection structure, and an air is kept between the connection structure and the telescopic structure. Tightness. The connection structure includes a connecting cylinder b16, and the telescopic structure includes a telescopic block b17. The inner wall of the front part of the connecting cylinder b16 is provided with a bump b16.1, the telescopic block b17 is made of flexible material, and the outer wall is provided with a chute b17.1.

In addition, the front inner wall of the connecting cylinder b16 is provided with a positioning protrusion b16.2, the inner wall of the rear side of the positioning protrusion b16.2 is provided with a guide ring 16.3, and the rear outer wall of the telescopic block b17 is provided with a positioning groove b17.2. A ring groove 17.3 is provided.

The third embodiment of the needle outlet part 10: as shown in Figure 17-22, the needle outlet part 10 includes a connection structure and a telescopic structure. Tightness. The connection structure includes a connecting cylinder c18, and the telescopic structure includes a telescopic block c19. The inner wall of the front part of the connecting cylinder c18 is provided with a guide cylinder b18.1, and the outer wall of the front end of the guide cylinder b18.1 is provided with a bump c18.2. The telescopic block c19 adopts Flexible material, with a chute c19.1 on the inner wall of the middle front.

In addition, the inner wall of the connecting cylinder c18 on the side of the guide cylinder b18.1 is provided with a positioning groove c18.3, and the outer wall of the rear part of the guide cylinder b18.1 is provided with a positioning protrusion c19.2.

It should be noted that, in the above three embodiments of the needle outlet part 10, the shape of the chute can be arc-shaped or continuous step-shaped, and other designs can also be used to replace the combination of the protrusion and the chute, such as intermeshing The thread structure can also play the same role.

Embodiment 4 of the needle outlet part 10: as shown in Figures 23-25, the needle outlet part 10 includes a connection structure and a telescopic structure, and the telescopic structure can be axially telescopically installed inside the connection structure.

Wherein, the connection structure includes a connecting cylinder d110, the telescopic structure includes a telescopic block d111, the inner wall of the connecting cylinder d110 is provided with an internal thread section 110.1, and the outer wall of the telescopic block d111 is provided with an external thread section 111.1. In addition, a positioning groove d110.2 is provided in the circumferential direction of the inner wall of the connecting cylinder d110, and a positioning protrusion d111.2 is provided at one end of the telescopic block d111.

The telescopic block d111 of this embodiment is completely hidden in the connecting cylinder d110. As shown in FIG. 26, the rear end of the connecting cylinder d110 is sealed and connected to the main body 20 of the blood collection pen. Thereby, the overall airtightness of the blood collection pen is realized.

Pen body part embodiment one: as shown in Figure 26-27, the pen body part includes the main body part 20, the piston part 30 inside the main body part 20 and the push rod part 40 that pushes the piston part 30, the piston part 30 and the push rod part 40 are not directly connected.

As shown in FIG. 29, the main body 20 includes a sleeve 21 and an outer sleeve 27. The outer sleeve 27 and the sleeve 21 have a certain gap and are connected to the sleeve 21 at the front end. The front side wall of the sleeve 21 is provided with a button hole. 21.1, the button hole 21.1 is provided with a button 22 and a trigger 23, the sleeve 21 on the front side of the trigger 23 is provided with the rear part of the front connector 24, and the front part of the front connector 24 is located in the connecting cylinder of the needle outlet part 10 Inside the rear cylinder. The front connecting piece 24 is provided with a needle seat assembly 25 with a magnetic metal part at the rear end, the rear guide cover 26 is provided at the rear end of the main body part 20, and the piston part 30 includes a piston main body 31 and a rear guide cover 26 for the piston main body 31. The elastic part for side movement, the front end of the piston body 31 is provided with an engaging structure that cooperates with the trigger 23, a groove is provided in the middle of the end surface, and a magnetic steel 32 is provided in the groove, and a piston ring groove is provided on the outside, and a piston is provided in it Circle 33. Wherein, the elastic member is a tension spring 34, and the rear end of the piston body 31 and the inner end of the rear guide cover 26 are respectively provided with a connection structure of the tension spring 34.

30, the push rod part 40 includes a push rod 41 that can move axially in the hole in the rear guide cover 26. The front end of the push rod 41 is a front push block 42, and the rear end is a pressing block 43. A return spring 44 is sleeved on the push rod 41 between the pressing blocks 43 . Wherein, the pressing block 43 is extended with a pressing sleeve 45 extending forward, and the front end of the pressing sleeve 45 is inserted into the gap between the outer sleeve 27 and the sleeve 21 .

The working process is: as shown in Fig. 27 and Fig. 28, they are respectively the release state and the limit state of the piston body 31. The process from the release state to the limit state is to push the push rod 41 along the rear guide cover 26 through the pressing block 43. Push in the sleeve 21, the front push block 42 moves forward to contact the rear end of the piston body 31 and continues to move until the front end of the piston body 31 engages with the trigger 23, and the magnetic steel 32 is attracted to the magnetic metal part of the needle seat assembly 25 Together, the extension spring 34 is stretched and deformed, and the push rod part 40 is reset and away from the piston part 30 under the action of the return spring 44; the process from the limit state to the release state is that when the button 22 is pressed, the front end of the piston body 31 and the trigger 23 Disengaged, under the action of the extension spring 34, the piston main body 31 quickly moves toward the direction of the rear guide cover 26. At the same time, under the action of the magnetic force, the needle seat of the needle seat assembly 25 moves backward. When the piston main body 31 reaches a certain position at the rear end, The magnetic metal part is separated from the magnetic steel 32, and under the action of the spring in the needle holder assembly 25, the needle holder is ejected forward and quickly pulled back to reset the needle holder to complete the blood collection work.

The second embodiment of the pen body: as shown in Figures 31-32 and 34-35, the difference from the first embodiment of the pen body is that there is no outer sleeve 27 and pressing sleeve 45, and the other structures are the same, and the structure is simpler.

The third embodiment of the pen body: as shown in Figure 31 and Figures 34-34, the difference from the second embodiment of the pen body is that the elastic member is a compression spring 35 instead of a tension spring 34, and the sleeve 21 on the rear side of the trigger 23 The inner wall is provided with a protruding ring 21.2, and the outer wall of the piston main body 31 is provided with steps.

Wherein, the protruding ring 21.2 of the third embodiment of the pen body is also applicable to the first and second embodiments, and plays the role of limiting the position of the piston body 31 and preventing its twisting.

It should be noted that an assembly can be formed between any of the above-mentioned embodiments of the needle outlet part 10 and the embodiment of the main body part 20 .

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. Equivalent technical means that a person can think of based on the concept of the present invention.

Claims

A blood collection pen, comprising a needle outlet part (10) and a pen body, characterized in that: the needle outlet part (10) includes a connection structure and a telescopic structure, the telescopic structure can be axially telescopically installed on the connection structure, The inner cavity of the needle part (10) and the pen body part keeps airtightness.
A blood collection pen according to claim 1, characterized in that: the connecting structure includes a connecting cylinder a (11), the telescopic structure includes a telescopic block a (13) and an adjustable front cover (14), the connecting cylinder a (11 ) is provided with a guide cylinder a (11.5) on the inner wall of the front part, a protrusion a (11.3) is provided on the side wall of the guide cylinder a (11.5), and a limit convex ring (11.1) is provided on the outside of the rear part, and the limit convex ring (11.1) There is a protrusion (11.2) on the outer wall, and a corresponding groove (14.1) on the inner wall of the rear end of the adjustable front cover (14). and the front end stretches out to adjust the front cover (14), and there are some limit guide strips (14.2) distributed in the front inner side of the front cover (14) in the adjustment front cover (14), and there are some limit guide strips (14.2) in the front circumferential distribution of the telescopic block a (13). Position guide groove (13.1), offers chute a (13.2) on telescopic block a (13).
A blood collection pen according to claim 2, characterized in that: the rear end of the telescopic block a (13) is provided with at least one notch, an elastic block (13.3) is provided in the notch, and a positioning protrusion is provided on the outside of the elastic block a (13.4), the inner wall of the limiting convex ring (11.1) is provided with a certain number of continuously distributed positioning grooves a (11.4).
A blood collection pen according to claim 2, characterized in that: the front end of the telescopic block a (13) is provided with an apron installation groove (13.5), and the apron installation groove (13.5) is provided with an apron (15) ,

A sealing ring (12) is provided between the guide cylinder a (11.5) and the telescopic block a (13).
A blood collection pen according to claim 1, characterized in that: the connecting structure includes a connecting tube b (16), the telescopic structure includes a telescopic block b (17), and the inner wall of the front part of the connecting tube b (16) is provided with a convex Block b (16.1), telescopic block b (17) adopts flexible material, and the outer wall is provided with chute b (17.1).
A blood collection pen according to claim 5, characterized in that: the inner wall of the front part of the connecting tube b (16) is provided with a positioning protrusion b (16.2), and the inner wall of the rear side of the positioning protrusion b (16.2) is provided with The guide ring (16.3), the rear outer wall of the telescopic block b (17) is provided with a positioning groove b (17.2), and the rear end is provided with a ring groove (17.3).
A blood collection pen according to claim 1, characterized in that: the connecting structure includes a connecting cylinder c (18), the telescopic structure includes a telescopic block c (19), and the front inner wall of the connecting cylinder c (18) is provided with Guide cylinder b (18.1), guide cylinder b (18.1) front end outer wall is provided with projection c (18.2), telescopic block c (19) adopts flexible material, and middle front part inner wall offers chute c (19.1).
A blood collection pen according to claim 7, characterized in that: the inner wall of the connecting cylinder c (18) on the side of the guiding cylinder b (18.1) is provided with a positioning groove c (18.3), and the guiding cylinder b (18.1) The rear outer wall is provided with a positioning protrusion c (19.2).
A blood collection pen according to claim 1, characterized in that: the connecting structure includes a connecting cylinder d (110), the telescopic structure includes a telescopic block d (111), and the inner wall of the connecting cylinder d (110) is provided with an internal thread section (110.1), telescopic block d (111) outer wall is provided with external thread segment (111.1).
A blood collection pen according to claim 9, characterized in that: the inner wall of the connecting cylinder d (110) is provided with a positioning groove d (110.2) in the circumferential direction, and one end of the telescopic block d (111) is provided with a positioning protrusion d (111.2 ).
A blood collection pen according to any one of claims 2-10, characterized in that: the pen body part comprises a main body part (20), a piston part (30) inside the main body part (20) and a pushing piston part ( 30) of the push rod portion (40);

The main body (20) comprises a sleeve (21), and the front side wall of the sleeve (21) is provided with a button hole (21.1), and the button hole (21.1) is provided with a button (22) and a trigger (23), and the trigger ( 23) The front sleeve (21) is provided with a front connector (24), and the front connector (24) is provided with a needle seat assembly (25) with a magnetic metal part at the rear end;

The piston part (30) includes a piston main body (31) and an elastic member that moves the piston main body (31) to one side of the rear guide cover (26). structure, a groove is arranged in the middle of the end face, a magnetic steel (32) is arranged in the groove, a piston ring groove is arranged on the outside, and a piston ring (33) is arranged inside;

The push rod part (40) comprises a rear guide cover (26) fixed on the rear end of the main body part (20) and a push rod (41) which can move axially in the hole in the rear guide cover (26), and the front end of the push rod (41) For pushing block (42) forward, the rear end is pressing block (43).
The blood collection pen according to claim 11, characterized in that: a return spring (44) is sleeved on the push rod (41) between the rear guide cover (26) and the pressing block (43).
A blood collection pen according to claim 11, characterized in that: the sleeve (21) is provided with an outer sleeve (27), and the outer sleeve (27) and the sleeve (21) have a certain gap and The front end is connected with the sleeve (21), and the extension of the pressing block (43) is provided with a pressing sleeve (45) extending forward, and the front end of the pressing sleeve (45) is inserted into the outer sleeve (27) and the sleeve (21) within the gap.
A blood collection pen according to any one of claims 12-13, characterized in that: the elastic member is a tension spring (34), and the rear end of the piston body (31) and the inner end of the rear guide cover (26) are respectively set There is a connecting structure of extension spring (34);

Or, described elastic part is stage clip (35), and the sleeve (21) inner wall of trigger (23) rear side is provided with protruding ring (21.2), and piston main body (31) outer wall is provided with step, stage clip (35) The two ends are offset against the steps of the protruding ring (21.2) and the piston main body (31) respectively.