CN111214245B

CN111214245B - Blood sampling pen

Info

Publication number: CN111214245B
Application number: CN201910882189.4A
Authority: CN
Inventors: 张立波; 崔成哲
Original assignee: Tianjin Huahong Technology Co Ltd
Current assignee: Tianjin Huahong Technology Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2022-09-06
Anticipated expiration: 2039-09-18
Also published as: CN111214245A

Abstract

The invention relates to a blood sampling pen, comprising: a housing having a first end and a second end; the needle seat and the driving core body are suitable for driving the needle seat to move towards the needle outlet direction based on elasticity; a second end of the head cap is connected to the first end of the shell; the guide part is arranged in the shell and used for guiding the movement of the driving core body and/or the needle seat; and a needle withdrawing member for needle withdrawing operation, wherein: the head cap is provided with an abutment portion adapted to prevent a needle withdrawing operation of the needle withdrawing member. The lancet further comprises a backstop axially movable within the housing, the backstop comprising an extension extending toward the second end of the housing; the extending portion is adapted to prevent the needle withdrawing member from moving in the needle withdrawing direction, and the abutting portion is adapted to abut against the needle withdrawing member to prevent the needle withdrawing member from moving in the needle withdrawing direction based on a force from the needle withdrawing member.

Description

Blood sampling pen

Technical Field

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

Background

Known blood collection pens may perform a needle withdrawal operation after performing a blood collection operation to withdraw a blood collection needle from the blood collection pen.

However, there is a problem in that the lancet is contaminated and wasted unnecessarily due to needle withdrawal caused by erroneous operation before the blood sampling operation.

Disclosure of Invention

The present invention has been made to mitigate or solve at least one of the above-mentioned problems.

According to an aspect of an embodiment of the present invention, there is provided a lancet, including:

a housing having a first end and a second end;

the needle seat and the driving core body are arranged in the shell, and the driving core body is suitable for driving the needle seat to move towards the needle outlet direction based on elasticity;

a second end of the head cap is connected to the first end of the shell;

the guide part is arranged in the shell and is used for guiding the movement of the driving core body and/or the needle seat; and

a needle withdrawing piece used for the needle withdrawing operation,

wherein:

the head cap is provided with an abutting portion adapted to prevent a needle withdrawing operation of the needle withdrawing member.

Optionally, the first end of the head cap is provided with a cap connecting piece, the first end of the housing is provided with a mating connecting piece, and the cap connecting piece and the mating connecting piece detachably cooperate with each other to prevent the head cap from moving relative to the housing in the needle outlet direction.

Optionally, the lancet further comprises a guide sleeve, the guide sleeve comprises the guide portion, a first end of the guide sleeve is located outside the housing, and a second end of the guide sleeve is located inside the first end of the housing; the first end of the head cap is provided with a cap connecting piece, the first end of the guide sleeve is provided with a matching connecting piece, and the cap connecting piece and the matching connecting piece are detachably matched with each other to prevent the head cap from moving relative to the shell in the needle outlet direction. Further, the cap connecting member includes a protrusion provided on an inner wall of the head cap, and the mating connecting member includes a guide groove hole provided on an outer wall of the second end of the guide sleeve, or the cap connecting member includes a protrusion provided on an outer wall of the second end of the guide sleeve, and the mating connecting member includes a guide groove hole provided on an inner wall of the head cap; and the projection is adapted to enter the guide slot in the circumferential direction, and a slot wall defining an end face of the guide slot near the second end of the guide sleeve is adapted to prevent the projection from moving in the needle-out direction.

Optionally, the lancet further comprises a tail cap disposed at the second end of the housing, the tail cap being adapted to move between a first position and a second position in the axial direction, the first position being closer to the first end of the housing than the second position, the tail cap being adapted to return from the first position to the second position; the needle withdrawing piece is arranged in the second end of the shell and is provided with a step portion, the first end of the tail cap in the axial direction is suitable for abutting against the step portion, and the tail cap is suitable for pushing the step portion to move towards the first end of the shell in the process of moving from the second position to the first position.

Optionally, the blood sampling pen further comprises a needle withdrawing reset piece, and the needle withdrawing reset piece provides elastic force for resetting of the needle withdrawing piece.

Optionally, in the above blood sampling pen, the blood sampling pen further includes a retraction member axially movable in the housing, and the retraction member includes an extension portion extending toward the second end of the housing; the needle withdrawing piece is arranged in the shell at the second end of the shell; the extending portion is adapted to prevent the needle withdrawing member from moving in the needle withdrawing direction, and the abutting portion is adapted to abut against the needle withdrawing member to prevent the needle withdrawing member from moving in the needle withdrawing direction based on a force from the needle withdrawing member.

Optionally, the backing block further comprises an annular body, and the extension portion extends from the annular body towards the second end of the housing, the annular body defining an opening for access by the lancet; the abutment portion is adapted to abut the annular body to prevent the annular body from moving in the needle-out direction based on a force from the needle-withdrawing member.

Optionally, the blood sampling pen further comprises a guide sleeve, and the guide sleeve comprises the guide part; and the annular body is arranged in the guide sleeve. Further optionally, the backstop further comprises a mating flange disposed at the first end of the annular body; the first end face of the matching flange in the axial direction is abutted with the abutting portion, and the second end face of the matching flange in the axial direction is abutted with one corresponding end face of the first end of the outer shell and the end face of the first end of the guide sleeve.

Optionally, the needle withdrawing member has a needle withdrawing arm extending from the first end of the body of the needle withdrawing member towards the first end of the housing; and an end of the extension portion is adapted to abut an end of the needle withdrawing arm in an axial direction.

Optionally, at least one of the ends of the needle withdrawing arm and the extending portion adapted to abut against each other is provided with a slope or a cambered surface facilitating movement of one through the other in the axial direction. Further, the end parts of the needle withdrawing arm and the extending part, which are suitable for abutting against each other, are provided with inclined planes which are convenient for the needle withdrawing arm and the extending part to pass through each other; or the end part of the needle withdrawing arm is provided with a bevel which is convenient for passing through the end part of the extension part.

Optionally, the extension part and the needle withdrawing arm have a first predetermined relative position and a second predetermined relative position, the extension part is suitable for preventing the needle withdrawing piece from moving along the needle withdrawing direction at the first predetermined relative position and allowing the needle withdrawing piece to move along the needle withdrawing direction at the second predetermined relative position, and the second predetermined relative position is staggered in the circumferential direction or the radial direction relative to the first predetermined relative position.

Optionally, the extension portion or the needle withdrawing arm has elasticity to deform in a radial direction or a circumferential direction based on abutment between an end of the needle withdrawing arm and an end of the extension portion so that the first predetermined relative position is shifted to the second predetermined relative position.

Optionally, the extension portion has elasticity, and the extension portion includes an extension body and an avoidance section, and a thickness of the avoidance section is smaller than a thickness of the extension body. Optionally, the notch formed by the extension part based on the reduction of the thickness of the avoidance section faces the central axis of the shell. Optionally, a partition plate member is arranged in the housing, the partition plate member is provided with a plurality of through holes for corresponding components to pass through, and the through holes include a first through hole for the needle withdrawing arm to pass through; the partition plate is provided with an avoidance blocking part on one side of the first through hole, which is close to the central axis of the shell, and the avoidance blocking part is provided with an avoidance inclined plane extending towards the central line of the shell; the extending portion deforms in a radial direction based on abutment between an end of the needle withdrawing arm and an end of the extending portion, so that the end of the extending portion moves from the first through hole to abut against the avoiding inclined surface, and the extending portion and the needle withdrawing arm are in the second predetermined relative position when the end of the extending portion abuts against the avoiding inclined surface.

Optionally, the avoidance blocking member further comprises a blocking body arranged at the tail end of the avoidance inclined plane, and the blocking body is suitable for preventing the avoidance section from moving towards the central axis of the housing. Optionally, a limiting blocking piece is further disposed in the housing and located on two sides of the first through hole in the circumferential direction, and the avoiding section of the extending portion is located between the limiting blocking pieces.

Optionally, an initial position where an end of the extending portion and an end of the needle withdrawing arm abut against each other is at the first through hole.

Optionally, the needle withdrawing member has a needle withdrawing portion extending from the first end of the needle withdrawing member body towards the first end of the housing, the needle withdrawing portion being spaced apart from the needle withdrawing arm in the circumferential direction; the blood sampling pen further comprises a needle withdrawing core body, and the needle withdrawing part is suitable for being abutted with the needle withdrawing core body based on needle withdrawing operation so as to act on the needle withdrawing core body; or optionally, the blood sampling pen further comprises a needle withdrawing core body, and the needle withdrawing arm is suitable for abutting against the needle withdrawing core body based on the needle withdrawing operation so as to act on the needle withdrawing core body.

Optionally, a positioning protrusion is arranged on the outer side of the extension part; the blood sampling pen is provided with a positioning hole groove matched with the positioning bulge, the positioning hole groove is provided with a positioning wall close to the first end of the shell, the positioning hole groove extends for a preset distance along the axial direction, the positioning bulge is suitable for being matched in the positioning hole groove, and the length of the positioning bulge in the axial direction is smaller than the preset distance; an end surface of the positioning projection adjacent to the housing is adapted to be in abutting engagement with the positioning wall to prevent further movement of the extension portion in the needle withdrawing direction, and the positioning projection is spaced from the positioning wall in the axial direction upon initial abutment of an end of the extension portion with an end of the needle withdrawing arm.

Optionally, the positioning slot is disposed in the housing; or optionally, the blood sampling pen further includes a guide sleeve, the guide sleeve includes the guide portion, the annular body is disposed in the guide sleeve, and the positioning slot is disposed in the guide sleeve.

Optionally, the abutment is adapted to abut a lancet provided on the needle hub, or to abut the needle hub, to prevent the needle hub from moving in the needle withdrawal direction based on a force from the needle withdrawing member.

According to another aspect of an embodiment of the present invention, there is provided a lancet, including:

a housing having a first end and a second end;

a second end of the head cap is connected to the first end of the shell;

the needle withdrawing piece is used for needle withdrawing operation and is suitable for moving along the needle withdrawing direction; and

a withdrawal stopping piece which is arranged in the first end of the shell in an axially movable manner and is suitable for being abutted against the needle withdrawing piece along the needle withdrawing direction,

wherein:

the head cap is provided with an abutting part which is suitable for abutting against the withdrawing prevention part so as to prevent the withdrawing prevention part from moving along the needle withdrawing direction.

Optionally, the blood sampling pen further comprises a tail cap, the tail cap is axially movably arranged at the second end of the housing, and the first end of the tail cap is suitable for acting on the needle withdrawing piece to push the needle withdrawing piece to move along the needle withdrawing direction.

Drawings

Fig. 1-1 is a schematic view of a head cap of a lancet according to an exemplary embodiment of the present invention, and fig. 1-2 is a sectional view of the lancet according to an exemplary embodiment of the present invention, which is parallel to an axial direction of the lancet, showing a mounting relationship between the head cap and a body of the lancet;

FIGS. 2-1 to 2-3 are schematic views of a withdrawing prevention member (needle withdrawing prevention member) of a lancet pen according to an exemplary embodiment of the present invention, which are respectively a front view, a perspective view and a sectional view thereof;

FIGS. 3-1 to 3-2 are schematic views of a guide sheath of a lancet according to an exemplary embodiment of the present invention;

FIGS. 4-1 to 4-4 are schematic views of a housing of a lancet according to an exemplary embodiment of the present invention, wherein FIG. 4-1 is an end view of the housing, FIG. 4-2 is a sectional view taken along A-A in FIG. 4-1, FIG. 4-3 is a sectional view taken along B-B in FIG. 4-1, and FIG. 4-4 is a perspective view of the housing;

FIG. 5 is a schematic view of a needle withdrawing member of a lancet pen according to an exemplary embodiment of the present invention;

FIG. 6 is a schematic view of the components of a lancet according to an exemplary embodiment of the present invention;

FIGS. 7-1 to 7-3 are schematic views of a lancet according to an exemplary embodiment of the present invention, in which FIG. 7-1 is a sectional view with a cap, FIG. 7-2 is a sectional view perpendicular to an axis of the lancet, FIG. 7-3 is a sectional view parallel to the axis of the lancet, and FIGS. 7-1 to 7-3 show a positional relationship between a needle withdrawing member and a needle blocking member before a needle withdrawing operation;

FIG. 8 is a cross-sectional view of a lancet parallel to the axis of the lancet, wherein the anti-backup element is in a retracted state and the needle-reversing element is in a state in which it can be moved further toward the first end of the housing (further in the needle-reversing or needle-withdrawing direction) in accordance with an exemplary embodiment of the present invention;

fig. 9 is a sectional view parallel to the axis of the lancet, of a lancet according to an exemplary embodiment of the invention, wherein a corresponding portion of the needle withdrawing member abuts the needle withdrawing core.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.

The structure and installation of a lancet according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings. It should be noted that some features or elements in some of the figures are not specifically shown for clarity of presentation.

In the invention, the head cap of the blood sampling pen is used as a matching part for preventing needle withdrawing misoperation, namely, the head cap stops the needle withdrawing operation when the head cap is not taken off from the main body of the blood sampling pen.

Accordingly, referring to all of the drawings of the present invention, embodiments of the present invention provide a lancet comprising:

a housing 70, the housing 70 having a first end and a second end, see, for example, fig. 4-1 to 4-4, in the present invention, the members having a length in the axial direction of the lancet each have a first end and a second end, the first end being an end of the assembled lancet that is close to the needle outlet of the lancet (e.g., the right end in fig. 1-2), and the second end being an end that is away from the needle outlet (e.g., the left end in fig. 1-2);

a needle holder and a driving core 40 (see fig. 6, for example), which are arranged in the housing 70, wherein the driving core 40 is adapted to drive the needle holder to move towards a needle withdrawing direction (in the present invention, the needle withdrawing direction) based on elastic force, in the drawing, an independent needle holder is not specifically shown, but the driving core 40 itself has the function of a needle holder, it should be noted that the needle holder can be arranged independently from the driving core, but the needle holder and the driving core are integrated or separated from each other, which is within the protection scope of the present invention;

headgear 10, see, e.g., fig. 1-1, with fig. 1-1 being an exemplary perspective view of headgear 10, as shown in fig. 1-2, with a second end of headgear 10 connected to a first end of housing 70;

a guide (in the exemplary embodiment shown in the drawings, guide 30, see, for example, fig. 3-1 and 3-2) disposed within housing 70 for guiding the movement of the drive core and/or hub, but it should be noted that guide 30 may not be provided, and it is within the scope of the present invention to provide a guide for the drive core and/or hub directly within housing 70; and

a needle withdrawing member 110 for needle withdrawing operation, the needle withdrawing member 110 being exemplarily shown in fig. 5,

wherein:

the head cap 10 is provided with an abutment 11 adapted to prevent the needle withdrawal operation of the needle withdrawal member.

In the embodiment of the present invention shown in the drawings, the lancet is formed to withdraw a needle by a pressing operation of the tail cap (see, for example, fig. 9). However, the present invention is not limited thereto, and it is within the scope of the present invention that the cap prevents the needle withdrawing operation when the cap is not removed from the main body of the lancet.

The above technical solution is described in detail below with reference to the accompanying drawings.

First, a connection relationship or a connection manner between the head cap 10 and the body of the lancet will be described with reference to fig. 1-1, 1-2, and 3-1 and 3-2. Fig. 1-1 are schematic views of a head cap of a lancet according to an exemplary embodiment of the present invention, and fig. 1-2 are sectional views of the lancet according to an exemplary embodiment of the present invention, parallel to an axial direction of the lancet, showing a mounted relationship between the head cap and a body of the lancet. Fig. 3-1 to 3-2 are schematic views of a guide sheath of a lancet according to an exemplary embodiment of the present invention.

As shown in fig. 1-2, a first end of guide sleeve 30 is outside of housing 70 and a second end of guide sleeve 30 is within the first end of housing 70; the first end of the headgear 10 is provided with a cap connector 12 (see fig. 1-1) and the first end of the guide sleeve 30 is provided with a mating connector 32 (see fig. 3-2), said cap connector 12 and said mating connector 32 being detachably engageable with each other to prevent movement of the headgear 10 in the needle-out direction relative to the housing 70. In the particular embodiment illustrated, the cap connection 12 comprises a projection provided on the inner wall of the headgear, the counter-connection 32 comprises a guide slot provided on the outer wall of the second end of the guide sleeve, the projection being adapted to enter the guide slot in a circumferential direction, the slot wall defining the end face of the guide slot close to the second end of the guide sleeve being adapted to prevent the projection from moving in the direction of needle withdrawal. As is readily understood by those skilled in the art, the coupling manner between the head cap and the guide sleeve is not limited thereto, and a coupling manner that can prevent the head cap from being separated from the guide sleeve in the axial direction may be employed.

Although not shown, even if the guide sleeve 30 is provided, a headgear may be provided directly at the first end of the housing 70. Accordingly, where guide sleeve 30 is not provided, but rather guidance of the drive core or hub is provided by structure provided on the inner wall of the housing, the headgear may be provided directly at the first end of housing 70. It is further noted that in case the outer wall of the first end of the housing is provided with further components, the head cap is also considered to be connected with the first end of the housing if the further components are connected in the axial direction. Correspondingly, the first end of the head cap is provided with a cap connecting piece, the first end of the shell is provided with a matching connecting piece, and the cap connecting piece and the matching connecting piece are detachably matched with each other to prevent the head cap from moving relative to the shell in the needle outlet direction.

The needle withdrawing operation using the tail cap is specifically described below by way of example.

As shown in fig. 1-2, 6 and 9, the lancet further includes a tail cap 140 disposed at the second end of the housing 70, the tail cap 140 is adapted to move between a first position (e.g., the position in fig. 9) and a second position (e.g., the position in fig. 1-2) in the axial direction, the first position is closer to the first end of the housing than the second position, the tail cap is adapted to return from the first position to the second position, and in a specific example, as shown in fig. 9, the needle withdrawing member 110 can be returned to push the tail cap 140 to return under the urging of the return spring 90 by means of the return spring 90 (corresponding to the needle withdrawing return member). It should be noted that the return spring 90 is not essential and may, for example, cause the needle withdrawing member and the corresponding tail cap to return upon a needle mounting operation. As shown in fig. 5 and 9, the needle withdrawing member 110 is disposed in the second end of the housing 70 and has a step 115, the first end of the tail cap 140 in the axial direction is adapted to abut against the step 115, and the tail cap is adapted to push the step to move toward the first end of the housing in the process of moving from the second position to the first position.

In the embodiment of the present invention shown in the drawings, the lancet is formed to withdraw a needle by a pressing operation of the tail cap (see, for example, fig. 9). However, the present invention is not limited to this, and for example, the tail cap may not be provided, and the tail cap may be formed integrally with the needle withdrawing member, and in this case, the needle withdrawing operation may be performed by directly pressing the needle withdrawing member.

It should also be noted that, in the present invention, when the head cap is used as a member for preventing erroneous withdrawal of the needle, the head cap may not be provided with the needle hole. In this case, after the lancet is installed in the lancet, the head cap is sleeved on the body of the lancet, so that a closed space is formed between the body and the head cap of the lancet, and compared with a needle outlet hole formed in the head cap of the lancet, the sanitation of the lancet is facilitated.

The following describes a specific scheme of how to prevent needle withdrawing misoperation when the tail part of the blood sampling pen is pressed to execute needle withdrawing operation, with reference to the attached drawings. At this time, in order to prevent the needle withdrawing operation, a withdrawing prevention member (a needle withdrawing prevention member by mistake) is specially provided, see fig. 2-1 to 2-3. Fig. 2-1 to 2-3 are schematic views of a withdrawing prevention member of a lancet according to an exemplary embodiment of the present invention, which are a front view, a perspective view, and a sectional view, respectively.

As shown in fig. 9, the needle withdrawing member 110 is disposed within the housing 70 at the second end thereof; as shown in fig. 5 and 9, for example, the lancet further comprises a retaining member 20 axially movable within the housing 70, the retaining member 20 including an extension 22 extending toward the second end of the housing 70; as shown in fig. 7-1 and 7-2, the extension portion 22 is adapted to prevent the needle withdrawing member 110 from moving in the needle withdrawing direction, and as shown in fig. 1-2, the abutting portion 11 is adapted to abut against the needle withdrawing member 20 (abut against the end surface 21 of the needle withdrawing member 20) to prevent the needle withdrawing member 20 from moving in the needle withdrawing direction based on the force from the needle withdrawing member.

In the exemplary embodiment of the present invention, the extension 22 is a long strip-shaped sheet body that can be elastically deformed if conditions allow.

In the particular example, the backstop 20 further comprises an annular body 28 (see the upper part in fig. 2-1), from which the extension 22 extends towards the second end of the housing, said annular body defining an opening for the access of a lancet (see, for example, fig. 2-2). The abutment 11 is adapted to abut the annular body to prevent the annular body from moving in the needle-out direction based on the force from the needle-withdrawing member. Illustratively, the annular body may also serve as a guide. It should be noted that the backstop 20 may not be limited to the shape shown in figures 2-1 to 2-3. For example, it may not be provided to define an opening for the access of a lancet, but only close to the wall of the housing (of course correspondingly, there are guide means to guide its movement).

As shown in fig. 8 and 9, the lancet further includes a guide sleeve 30 in which the annular body 28 of the retaining member 20 is disposed. As shown in fig. 2-1, the retraction prevention member further includes a fitting flange 27 provided at a first end of the annular main body 28, a first end face (top face in fig. 2-1) of the fitting flange 27 in the axial direction abuts against the abutting portion 11 (see fig. 1-2), and a second end face (bottom face in fig. 2-1) of the fitting flange 27 in the axial direction abuts against an end face 33 of the first end of the guide sleeve 30 (see fig. 1-2). It is to be noted that in the case where the headgear 10 is directly connected to the housing 70, the fitting flange 27 may also abut against the end face of the first end of the housing 70.

Fig. 5 is a schematic view of a needle withdrawing member of a lancet pen according to an exemplary embodiment of the present invention. As shown in fig. 5, the needle withdrawing member 110 has a needle withdrawing arm 111 extending from the first end of the needle withdrawing member body toward the first end of the housing; and an end portion (e.g., end surface 24) of the extension portion 22 is adapted to abut an end portion (e.g., end surface 112) of the needle withdrawing arm 111 in the axial direction.

In fig. 5, the needle withdrawing member 110 has a needle withdrawing portion 114 extending from the first end of the needle withdrawing member body toward the first end of the housing, the needle withdrawing portion 114 being spaced from the needle withdrawing arm 111 in the circumferential direction; and as shown in fig. 6, the blood sampling pen further comprises a needle withdrawing core 50, the needle withdrawing part 114 is adapted to abut against the needle withdrawing core 50 to act on the needle withdrawing core 50 based on the needle withdrawing operation, for example, referring to fig. 9, an end surface 113 of the needle withdrawing part 114 abuts against an end 51 of the needle withdrawing core 50.

It should be noted that the needle withdrawing portion 114 may not be provided, but the needle withdrawing arm 111 may also be a component that directly acts on the needle withdrawing core 50, i.e., the needle withdrawing arm is adapted to abut against the needle withdrawing core to act on the needle withdrawing core based on the needle withdrawing operation. This is also within the scope of the invention.

The fitting between the needle withdrawing arm 111 and the extension portion 22 is exemplarily described below with reference to the drawings.

Fig. 4-1 to 4-4 are schematic views of a housing of a lancet according to an exemplary embodiment of the present invention, in which fig. 4-1 is an end view of the housing, fig. 4-2 is a sectional view taken along a-a in fig. 4-1, fig. 4-3 is a sectional view taken along B-B in fig. 4-1, and fig. 4-4 is a perspective view of the housing. Fig. 7-1 to 7-3 are schematic views of a lancet according to an exemplary embodiment of the present invention, in which fig. 7-1 is a sectional view with a cap, fig. 7-2 is a sectional view perpendicular to an axis of the lancet, fig. 7-3 is a sectional view parallel to the axis of the lancet, and fig. 7-1 to 7-3 show a positional relationship between a needle withdrawing member and a needle blocking member before a needle withdrawing operation. Fig. 8 is a cross-sectional view of a lancet parallel to the axis of the lancet, wherein the backstop is in a retracted state and the needle-withdrawing member is in a state of being further movable toward the first end of the housing (further in the needle-withdrawing direction or the needle-withdrawing direction), according to an exemplary embodiment of the present invention. Fig. 9 is a sectional view parallel to the axis of the lancet, of a lancet according to an exemplary embodiment of the invention, wherein a corresponding portion of the needle withdrawing member abuts the needle withdrawing core.

Referring to fig. 2-1 to 2-3, fig. 5 and fig. 7-1 and 7-3, it can be seen that the ends of the needle withdrawing arm 111 and the extending part 22, which are adapted to abut against each other, are provided with inclined surfaces for facilitating the passage of the needle withdrawing arm and the extending part, wherein the extending part is provided with an inclined surface 24, the needle withdrawing arm 111 is provided with an inclined surface 112, and the two inclined surfaces are opposite to each other. It is to be noted that the present invention is not limited thereto, and one of the end portions of the needle withdrawing arm and the extended portion adapted to abut against each other may be provided with a slope or a curved surface facilitating the movement of one through the other in the axial direction, and further, the end portion of the needle withdrawing arm may be provided with a slope facilitating the passage through the end portion of the extended portion.

The extension 22 and the needle withdrawing arm 111 may have a first predetermined relative position and a second predetermined relative position therebetween, the extension being adapted to prevent movement of the needle withdrawing member in the needle withdrawing direction in the first predetermined relative position (e.g., the positions shown in fig. 7-1 and 7-3) and to allow movement of the needle withdrawing member in the needle withdrawing direction in the second predetermined relative position (e.g., the position shown in fig. 8), the second predetermined relative position being circumferentially or radially offset with respect to the first predetermined relative position. In the example shown in fig. 8, the second predetermined relative position is staggered in the radial direction with respect to the first predetermined relative position, the extension 22 being displaced radially inwards. It should be noted that the first predetermined relative position and the second predetermined relative position are two relative position states that the extension portion and the needle withdrawing arm can be in. In addition to the illustrated radial offset, the extension and the needle withdrawal member may also be circumferentially offset or offset.

In the illustrated example, the offset or staggering between the first predetermined relative position and the second predetermined relative position is embodied on the extension portion, in particular, the extension portion has elasticity to deform in a radial direction or a circumferential direction based on the abutment between the end of the needle withdrawing arm and the end of the extension portion, such that the first predetermined relative position shifts to the second predetermined relative position. However, the invention is not limited thereto and an offset or offset may also be embodied on the needle stripping element, which is also within the scope of the invention.

In the illustrated example, as shown in fig. 2-1 to 2-3, the extension portion 22 has elasticity, the extension portion 22 includes an extension body and a relief section 25, and the thickness of the relief section 25 is smaller than that of the extension body. In an exemplary embodiment, as shown in fig. 2-2, 2-3, and 7-3, the gap formed by the extension based on the reduced thickness of the relief segment faces the central axis of the housing. In fig. 7-3, the notches are located on the right side of the avoidance segment, and optionally, on the left side of the avoidance segment, are within the scope of the present invention.

As shown in fig. 4-1 to 4-4, 7-2 and 7-3, a partition member 75 is provided in the housing 70, and the partition member 75 is provided with a plurality of through holes (shown in fig. 4-1 and 7-2) through which the respective members pass, including a first through hole 71 (see fig. 4-1 to 4-4) through which the needle withdrawing arm passes.

As shown in fig. 7-1 to 7-3, the bulkhead member is provided with an escape stopper 76 (see fig. 7-2) on a side of the first through hole 71 close to the center axis of the housing, the escape stopper 76 having an escape slope 72 extending toward the center line of the housing.

Referring to fig. 8, the extended portion 22 is deformed in the radial direction based on the abutment between the end of the needle withdrawing arm and the end of the extended portion, so that the end of the extended portion moves from the first through hole 71 to abut against the escape slope 72 (in fig. 8, the ridge line 26 of the end of the extended portion has abutted against the escape slope 72), and when the end of the extended portion abuts against the escape slope, the extended portion and the needle withdrawing arm are in the second predetermined relative position.

As shown in fig. 8, the escape blocking member 76 further comprises a blocking body 77 disposed at a distal end of the escape ramp, and the blocking body 77 is adapted to block the escape segment 25 from moving toward the central axis of the housing.

As shown in fig. 4-1 to 4-4 and 7-2, limit stoppers 73 are further provided in the housing 70 on both sides of the first through hole 71 in the circumferential direction, and the escape section 25 of the extension is located between the limit stoppers 73.

As shown in fig. 7-1 and 7-3, an initial position in which the end of the extended portion and the end of the needle withdrawing arm abut against each other (more specifically, the two

inclined surfaces

24 and 112 abut against each other) is at the first through hole 71.

As shown in fig. 2-1 and 2-3, the outside of the extension 22 is provided with a positioning projection 23.

As shown in fig. 8, the annular body 28 of the retraction preventing member 20 is disposed in the guide sleeve, as shown in fig. 3-1, the guide sleeve 30 is provided with a positioning hole groove 31 which is matched with the positioning protrusion 23, the positioning hole groove 31 has a positioning wall (refer to fig. 8, which is a wall abutting against the positioning protrusion 23) close to the first end of the housing, and the positioning hole groove extends along the axial direction for a predetermined distance, the positioning protrusion 23 is adapted to be matched in the positioning hole groove 31 (refer to fig. 8), and the length of the positioning protrusion 23 in the axial direction is smaller than the predetermined distance; the end surface of the positioning projection 23 close to the housing is adapted to be in abutting engagement with the positioning wall to prevent the extension portion from moving further in the needle-out direction (see fig. 8), and the positioning projection is spaced from the positioning wall in the axial direction when the end of the extension portion is initially abutted with the end of the needle-withdrawing arm, so that a space can be provided for the extension portion to move in the needle-out direction.

Although not shown, the positioning slot may be provided on the housing without the guide sleeve.

FIG. 6 is a schematic diagram of the components of a lancet pen according to an exemplary embodiment of the present invention. Fig. 9 also shows an exemplary embodiment of the components of the lancet pen (with the cap removed). As shown in fig. 6 and 9, the blood sampling pen includes a cap 10, a retraction preventing member 20, a guide sleeve 30, a needle holder and driving core 40, a needle withdrawing core 50, a driving spring 60, a housing 70, a push button 80, a needle withdrawing member return spring 90, a needle withdrawing member 110, a driving core return spring 120, a baffle 130, a tail cap 140, and a blood sampling needle 150. It should be noted that, in the present invention, the head cap is used to prevent the needle withdrawing from being operated by mistake, so that, as can be understood by those skilled in the art, in the case where the head cap can be used to prevent the needle withdrawing from being operated by mistake, not all the components shown in the figures are included in the solution defined in the independent claims of the present invention while the blood sampling and needle withdrawing functions of the blood sampling pen are maintained.

The erroneous needle withdrawal prevention function of the present invention will be described below by way of example with reference to the accompanying drawings.

Fig. 7-1 to 7-3 are states without withdrawing the needle (in which the lancet 150 is not shown). At this time, the inclined surface 112 of the needle withdrawing arm 111 abuts against the inclined surface 24 of the extending portion 22 in the first through hole 71, and further axial movement of the needle withdrawing arm 111 is restricted. Meanwhile, the avoidance segment 25 of the extension portion 22 is located between the limit stoppers 73 on both sides of the first through hole 71, which prevents the avoidance segment 25 from moving in the circumferential direction, although the limit stoppers are not necessary. The escape blocking member 76 also prevents the escape segment 25 of the extension 22 from moving radially inward.

In fig. 7-3, the inclined surface 112 of the needle withdrawing arm 111 and the inclined surface 24 of the extension portion 22 are in the first through hole 71 and at the control section. In the example of fig. 7-3, the avoidance segment 25 cannot move in other directions than upward in fig. 7-3.

Referring to fig. 7-1, when the avoidance segment 25 is in the control segment, the positioning projection 23 is in the positioning hole groove 31, and the positioning projection 23 is axially spaced from the blocking wall of the positioning hole groove, which also defines the distance that the check member 20 can axially extend from the state of fig. 7-1.

After the headgear 10 is removed, the retreat-preventing member 20 can move axially without a resisting force from the headgear. As shown in fig. 9, when a pressing force is applied to the tail cap 140, referring to fig. 8, the extension 22 is first axially moved by a predetermined distance until the positioning projection 23 abuts against the stopper wall of the positioning hole groove 31. Then, upon further pressure, in the mating segment of fig. 7-3, the relief segment 25 of the extension 22 moves distally onto the relief ramp 72 due to elastic deformation and the radially inward force of the ramp 112, causing controlled deformation thereof. The blocking body 77 of the escape barrier 76 prevents the escape segment 25 from radially crossing the escape barrier, leaving the possibility for the subsequent escape segment 25 to be reset.

Thereafter, the needle withdrawing arm 111 may be further axially moved until the end surface 113 of the needle withdrawing portion 114 of the needle withdrawing member 110 abuts against the end 51 of the needle withdrawing core 50, and the lancet 150 is withdrawn thereafter, thereby completing the needle withdrawing operation.

After needle withdrawal is completed, the pressing force in fig. 9 is removed, the needle withdrawing member moves toward the second end of the housing 70 based on the elastic force of the return spring 90, and the inclined surface 112 of the needle withdrawing arm 111 also returns to the position in fig. 7-3. The tip of the avoidance segment 25 of the extension portion returns to a position substantially aligned with the first through hole 71 from the avoidance slope 72 based on elastic deformation. After or before the application of an additional lancet, the anti-kickback member 20 returns to the position in figures 7-3 on the basis of the thrust. After the cap 10 is set onto the pen body, as shown in fig. 1-2, the abutment 11 in the cap 10 abuts against the backstop 20 to prevent erroneous withdrawal of the needle.

In the illustrated embodiment, the abutment in the cap or cap abuts the backstop 20, but the invention is not limited thereto. For example, the abutment may also be designed to abut against a lancet provided on the needle hub, or to abut against the needle hub, to prevent the needle hub from moving in the needle-out direction based on the force from the needle-withdrawing member. It should also be noted that the retaining member may be other than the retaining member 20 described above, such as a retaining member integrally formed with the extension portion, or a member directly acting on the needle withdrawing core. The abutment in the head cap is also not limited to the form shown in the drawings, and may be, for example, in the form of a rib, in the form of a face or a boss, in addition to the inner wall of the head cap, at the end face of the head cap, or the like. It is within the scope of the present invention that the abutting portion provided to the head cap abuts against the withdrawal preventing member as long as the withdrawal preventing member can prevent the needle withdrawal operation.

Based on the above, the invention proposes the following scheme:

1. a blood collection pen comprising:

a housing having a first end and a second end;

the second end of the head cap is connected to the first end of the shell;

the guide part is arranged in the shell and used for guiding the movement of the driving core body and/or the needle seat; and

a needle withdrawing piece used for the needle withdrawing operation,

wherein:

Optionally, the lancet further comprises a backstop axially movable within the housing, the backstop comprising an extension extending toward the second end of the housing; the needle withdrawing piece is arranged in the shell at the second end of the shell; the extending portion is adapted to prevent the needle withdrawing member from moving in the needle withdrawing direction, and the abutting portion is adapted to abut against the needle withdrawing member to prevent the needle withdrawing member from moving in the needle withdrawing direction based on a force from the needle withdrawing member.

2. A lancet, comprising:

a housing having a first end and a second end;

the second end of the head cap is connected to the first end of the shell;

the needle withdrawing piece is used for needle withdrawing operation and is suitable for moving along a needle outlet direction; and

wherein:

the head cap is provided with a butting part which is suitable for being butted with the withdrawing-resistant part so as to prevent the withdrawing-resistant part from moving along the needle withdrawing direction.

Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Claims

1. A lancet, comprising:

a housing having a first end and a second end;

the second end of the head cap is connected to the first end of the shell;

the guide part is arranged in the shell and used for guiding the movement of the driving core body and/or the needle seat;

a needle withdrawing member for needle withdrawing operation, the needle withdrawing member being disposed within the housing at the second end of the housing; and

a backstop member, a second end of the backstop member being provided with an extension extending towards a second end of the housing, the backstop member being axially movable within the housing,

wherein:

the head cap is provided with an abutting part which is suitable for preventing the needle withdrawing operation of the needle withdrawing piece; and

the first end of the withdrawing prevention piece is suitable for abutting against the abutting part so as to prevent the withdrawing prevention piece from moving in the needle withdrawing direction based on the force from the needle withdrawing piece, and the extending part is suitable for abutting against the needle withdrawing piece so as to prevent the needle withdrawing piece from moving in the needle withdrawing direction.

2. The lancet of claim 1, wherein:

the first end of the head cap is provided with a cap connecting piece, the first end of the shell is provided with a matching connecting piece, and the cap connecting piece and the matching connecting piece are detachably matched with each other to prevent the head cap from moving relative to the shell in the needle outlet direction.

3. The lancet of claim 1, wherein:

the blood sampling pen further comprises a guide sleeve, the guide sleeve comprises the guide part, the first end of the guide sleeve is positioned outside the shell, and the second end of the guide sleeve is positioned in the first end of the shell;

the first end of the head cap is provided with a cap connecting piece, the first end of the guide sleeve is provided with a matching connecting piece, and the cap connecting piece and the matching connecting piece are detachably matched with each other to prevent the head cap from moving relative to the shell in the needle outlet direction.

4. The lancing pen according to claim 3, wherein:

the cap connecting piece comprises a protrusion arranged on the inner wall of the head cap, and the matching connecting piece comprises a guide slot hole arranged on the outer wall of the second end of the guide sleeve, or the cap connecting piece comprises a protrusion arranged on the outer wall of the second end of the guide sleeve, and the matching connecting piece comprises a guide slot hole arranged on the inner wall of the head cap; and is provided with

The projection is adapted to enter the guide slot in a circumferential direction, and a slot wall defining an end face of the guide slot near the second end of the guide sleeve is adapted to prevent the projection from moving in a needle-out direction.

5. The lancet of claim 1, wherein:

the lancet further comprises a tail cap disposed at the second end of the housing, the tail cap being adapted to move between a first position and a second position in the axial direction, the first position being closer to the first end of the housing than the second position, the tail cap being adapted to reset from the first position to the second position;

the needle withdrawing piece is arranged in the second end of the shell and is provided with a step part, the first end of the tail cap in the axial direction is suitable for being abutted to the step part, and the tail cap is suitable for pushing the step part to move towards the first end of the shell in the process of moving from the second position to the first position.

6. The lancet of claim 1, wherein:

the blood sampling pen further comprises a needle withdrawing reset piece, and the needle withdrawing reset piece provides elasticity for the reset of the needle withdrawing piece.

7. The lancet of claim 1, wherein:

the backing block further comprises an annular body, the extension part extends from the annular body towards the second end of the shell, and the annular body defines an opening for the entry and exit of the blood taking needle;

the abutment portion is adapted to abut the annular body to prevent the annular body from moving in the needle-out direction based on a force from the needle-withdrawing member.

8. The lancet of claim 7, wherein:

the blood sampling pen further comprises a guide sleeve, and the guide sleeve comprises the guide part; and is provided with

The annular body is arranged in the guide sleeve.

9. The lancet of claim 8, wherein:

the anti-receding element further comprises a matching flange arranged at the first end of the annular main body;

the first end face of the matching flange in the axial direction is abutted with the abutting portion, and the second end face of the matching flange in the axial direction is abutted with one corresponding end face of the first end of the outer shell and the end face of the first end of the guide sleeve.

10. The lancing pen according to claim 1, wherein:

the needle withdrawing piece is provided with a needle withdrawing arm extending from the first end of the needle withdrawing piece main body to the first end of the shell; and is provided with

An end of the extension portion is adapted to abut an end of the needle withdrawing arm in an axial direction.

11. The lancet of claim 10, wherein:

at least one of the end portions of the needle withdrawing arm and the extending portion, which are adapted to abut against each other, is provided with a slope or a cambered surface that facilitates one to move in the axial direction through the other.

12. The lancet of claim 11, wherein:

the needle withdrawing arm and the end part of the extension part, which is suitable for being abutted to each other, are provided with inclined planes which are convenient for the needle withdrawing arm and the extension part to pass through each other; or

The end part of the needle withdrawing arm is provided with an inclined plane which is convenient to pass through the end part of the extension part.

13. The lancet of claim 10, wherein:

the extension part and the needle withdrawing arm have a first preset relative position and a second preset relative position, the extension part is suitable for preventing the needle withdrawing part from moving along the needle withdrawing direction at the first preset relative position and allowing the needle withdrawing part to move along the needle withdrawing direction at the second preset relative position, and the second preset relative position is staggered in the circumferential direction or the radial direction relative to the first preset relative position.

14. The lancet of claim 13, wherein:

the extending portion or the needle withdrawing arm has elasticity to deform in a radial direction or a circumferential direction based on abutment between an end of the needle withdrawing arm and an end of the extending portion so that the first predetermined relative position is shifted to the second predetermined relative position.

15. The lancet of claim 14, wherein:

the extension part has elasticity, the extension part includes extension body and dodges the section, dodge the thickness of section and be less than the thickness of extension body.

16. The lancet of claim 15, wherein:

the extension part faces the central axis of the shell based on a gap formed by the reduction of the thickness of the avoidance section.

17. The lancet pen of claim 15, wherein:

a partition plate is arranged in the shell, a plurality of through holes for corresponding parts to pass through are formed in the partition plate, and the through holes comprise first through holes for the needle withdrawing arms to pass through;

the partition plate is provided with an avoidance blocking part on one side of the first through hole, which is close to the central axis of the shell, and the avoidance blocking part is provided with an avoidance inclined plane extending towards the central line of the shell;

the extending portion deforms in the radial direction based on the abutting between the end portion of the needle withdrawing arm and the end portion of the extending portion, so that the end portion of the extending portion moves from the first through hole to abut against the avoiding inclined surface, and when the end portion of the extending portion abuts against the avoiding inclined surface, the extending portion and the needle withdrawing arm are located at the second preset relative position.

18. The lancet of claim 17, wherein:

the avoiding blocking piece further comprises a blocking body arranged at the tail end of the avoiding inclined plane, and the blocking body is suitable for preventing the avoiding section from moving towards the central axis of the shell.

19. The lancet of claim 17, wherein:

the shell is internally provided with limiting blocking pieces which are circumferentially positioned at two sides of the first through hole, and the avoiding section of the extending part is positioned between the limiting blocking pieces.

20. The lancet of claim 17, wherein:

an initial position in which an end of the extending portion and an end of the needle withdrawing arm abut against each other is at the first through hole.

21. The lancet of claim 11, wherein:

the needle withdrawing member has a needle withdrawing portion extending from a first end of a main body of the needle withdrawing member toward a first end of the housing, the needle withdrawing portion being spaced apart from the needle withdrawing arm in a circumferential direction; the blood sampling pen further comprises a needle withdrawing core body, and the needle withdrawing part is suitable for being abutted against the needle withdrawing core body based on needle withdrawing operation so as to act on the needle withdrawing core body; or

The blood sampling pen further comprises a needle withdrawing core body, and the needle withdrawing arm is suitable for being abutted to the needle withdrawing core body based on needle withdrawing operation so as to act on the needle withdrawing core body.

22. The lancet of claim 1, wherein:

the needle withdrawing piece is provided with a needle withdrawing arm extending from the first end of the needle withdrawing piece main body to the first end of the shell;

an end of the extension portion is adapted to abut an end of the needle withdrawing arm in an axial direction;

a positioning bulge is arranged on the outer side of the extension part;

the blood sampling pen is provided with a positioning hole groove matched with the positioning bulge, the positioning hole groove is provided with a positioning wall close to the first end of the shell, the positioning hole groove extends for a preset distance along the axial direction, the positioning bulge is suitable for being matched in the positioning hole groove, and the length of the positioning bulge in the axial direction is smaller than the preset distance;

an end surface of the positioning projection near the housing is adapted to be in abutting engagement with the positioning wall to prevent the extension portion from further moving in the needle-out direction, and the positioning projection is spaced apart from the positioning wall in the axial direction when the end of the extension portion is initially abutted with the end of the needle-withdrawing arm.

23. The lancet of claim 22, wherein:

the positioning slot hole is arranged in the shell; or alternatively

The backing block further comprises an annular body, the extension part extends from the annular body towards the second end of the shell, and the annular body defines an opening for the entry and exit of the blood taking needle; the abutting portion is adapted to abut against the annular body to prevent the annular body from moving in the needle ejecting direction based on a force from the needle withdrawing member; the blood sampling pen further comprises a guide sleeve, the guide sleeve comprises the guide part, the annular body is arranged in the guide sleeve, and the positioning groove hole is formed in the guide sleeve.

24. The lancet of any one of claims 1-6, wherein:

the abutting portion is adapted to abut against a blood collection needle provided on the needle holder, or adapted to abut against the needle holder to prevent the needle holder from moving in a needle withdrawal direction based on a force from the needle withdrawing member.

25. A lancet, comprising:

a housing having a first end and a second end;

a second end of the head cap is connected to the first end of the shell;

the withdrawing prevention piece is arranged in the first end of the shell in an axially movable mode, the second end of the withdrawing prevention piece is provided with an extending part extending towards the second end of the shell, the extending part is suitable for being abutted against the needle withdrawing piece along the needle withdrawing direction to prevent the needle withdrawing piece from moving along the needle withdrawing direction,

wherein:

the head cap is provided with an abutting portion which is suitable for abutting against a first end of the withdrawing prevention piece so as to prevent the withdrawing prevention piece from moving along the needle withdrawing direction based on the force from the needle withdrawing piece.

26. The lancet of claim 25, wherein:

the blood sampling pen further comprises a tail cap, the tail cap is arranged at the second end of the shell in an axially movable mode, and the first end of the tail cap is suitable for acting on the needle withdrawing piece to push the needle withdrawing piece to move along the needle withdrawing direction.