CN111166348B

CN111166348B - Blood taking needle

Info

Publication number: CN111166348B
Application number: CN201811337335.7A
Authority: CN
Inventors: 张立波
Original assignee: Tianjin Huahong Technology Co Ltd
Current assignee: Tianjin Huahong Technology Co Ltd
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2023-06-06
Anticipated expiration: 2038-11-12
Also published as: CN111166348A

Abstract

The present invention relates to a lancet comprising: one end of the outer sleeve is provided with a needle outlet, the other end of the outer sleeve is provided with a containing port, and a needle core guide part is arranged in the outer sleeve; one end of the inner sleeve enters the outer sleeve from the containing port and is in clamping fit with the outer sleeve, and the other end of the inner sleeve is positioned outside the containing port; the needle core is provided with a blood taking needle body and can be rotationally arranged at one end of the inner sleeve along the circumferential direction along with the inner sleeve; and a spring for providing power for axial movement of the needle core along the needle core guide portion toward the needle outlet, wherein: the inner part of the outer sleeve is provided with a step surface adjacent to the needle core guide part, and the needle core is provided with an abutting end surface abutting against the step surface; the inside of the outer sleeve is provided with a rotary guide part, and one end of the inner sleeve is provided with a rotary matching part matched with the rotary guide part at the radial outer side; and based on the axial movement of the inner sleeve toward the needle outlet, the rotation fitting portion is fitted with the rotation guide portion so that the inner sleeve rotates in the circumferential direction, and based on the rotation, the abutment end face is adapted to come out of the step face into the needle core guide portion.

Description

Blood taking needle

Technical Field

The invention relates to the field of medical equipment, in particular to a blood taking needle.

Background

In the conventional blood taking needle, the needle core is generally emitted by pressing an inner sleeve which is in direct contact with the skin of a patient. However, when the pressing force of the patient is too large, the lancet may be too deep. In addition, since the inner sheath is pressed by integrally pressing the lancet, the pressing operation of the inner sheath is inconvenient.

Disclosure of Invention

To alleviate or solve at least one of the above problems, the present invention proposes a lancet that is pressed at the top to trigger a blood sampling operation.

According to an embodiment of the present invention, a lancet of the present invention includes:

one end of the outer sleeve is provided with a needle outlet, the other end of the outer sleeve is provided with a containing port, and a needle core guide part is arranged in the outer sleeve;

one end of the inner sleeve enters the outer sleeve from the containing port and is in clamping fit with the outer sleeve, and the other end of the inner sleeve is positioned outside the containing port;

the blood taking needle comprises a needle core, a needle cover and a needle cover, wherein the needle core is provided with a blood taking needle body and can be rotationally arranged at one end of the inner sleeve along the circumferential direction along with the inner sleeve; and

a spring for providing power for the axial movement of the needle core along the needle core guiding part towards the needle outlet,

wherein:

the inside of the outer sleeve is provided with a step surface adjacent to the needle core guiding part, and the needle core is provided with an abutting end surface abutting against the step surface;

a rotary guide part is arranged in the outer sleeve, and a rotary matching part matched with the rotary guide part is arranged at the radial outer side of one end of the inner sleeve; and is also provided with

Based on the axial movement of the inner sleeve toward the needle outlet, the rotation fitting portion is fitted with the rotation guide portion so that the inner sleeve rotates in the circumferential direction, and based on the rotation, the abutment end face is adapted to come away from the step face into the needle core guide portion.

Optionally, the rotation guide portion includes an inclined surface; the rotational engagement portion includes an engagement flange projecting radially outwardly from the inner sleeve, the engagement flange being adapted to engage the inclined surface.

Further optionally, the needle core has a radially protruding needle core protrusion, the needle core protrusion having the abutment end face; the inner sleeve has a core slot that receives the core protuberance and allows the core protuberance to move axially therein, and the radially extending end edges of the housing that form the core slot form the mating flange.

Or further alternatively, the outer sleeve is internally provided with inclined ribs, the rotation guide portion includes the inclined ribs, and the inclined ribs protrude radially inward and have the inclined surface.

Or further alternatively, the inclined surface is located radially outside the needle guide.

Optionally, the rotation guide part is an inclined guide groove; the rotary fitting portion is a fitting projection projecting radially outwardly from the inner jacket, the fitting projection being adapted to move within the inclined guide groove.

Optionally, the spring is disposed within the inner sleeve between the needle core and one end of the inner sleeve.

Optionally, the outer sleeve is provided with an inner sleeve guide part; one end of the inner sleeve is provided with an elastic buckling structure, and the elastic buckling structure is suitable for moving along the inner sleeve guide part and is suitable for buckling and matching with the outer sleeve.

Optionally, the needle core further comprises a needle cap arranged on the blood taking needle body, the needle cap penetrates out of the outer sleeve through the needle outlet, the needle cap is provided with a needle cap hanging table, and the needle cap hanging table is abutted against the inner end surface of one end of the outer sleeve based on potential energy of the spring; the needle outlet is provided with an open channel which allows the needle cap hanging table to pass through only in a specific direction.

Further alternatively, in a case where the cap mount abuts an inner end face of one end of the outer sleeve, the abutting end face is spaced apart from the step face in an axial direction; and the abutment end surface axially moves to abut against the step surface based on the elastic force of the spring in a state that the needle cap is removed from the lancet.

Drawings

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

FIG. 2 is a schematic cross-sectional view of the lancet of FIG. 1 with the needle cap not removed;

FIG. 3 is a schematic cross-sectional view of the lancet of FIG. 1 with the needle cap removed and the core in a to-be-fired position;

FIG. 4 is a schematic cross-sectional view of the lancet of FIG. 3 with the hub fired so that the lancet body extends from the outlet port;

FIG. 5 is a schematic cross-sectional view of the lancet of FIG. 3, wherein the lancet body is retracted within the housing after the lancing operation is completed;

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

FIG. 7 is a schematic perspective view of a lancet according to an exemplary embodiment of the present invention;

FIG. 8 shows an exemplary schematic of a needle in accordance with the present invention mated with an inner sleeve; and

fig. 9 is an enlarged schematic view of a rotation fitting portion and a rotation guide portion according to an exemplary embodiment of the present invention.

Detailed Description

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

A lancet according to an exemplary embodiment of the present invention will be described in detail with reference to fig. 1 to 9, it being noted that some features or components are not specifically shown in the drawings for clarity of illustration. As shown in the drawings, the lancet according to the present invention includes:

a housing 10 having a needle outlet 11 (shown in fig. 7) provided at one end (in the present invention, one end is a front end, an end close to the blood collection skin) and a receiving port 12 (shown in fig. 7) provided at the other end (in the present invention, the other end is a rear end, an end far from the blood collection skin), and a needle guide 13 (shown in fig. 6 and 7) provided inside the housing;

an inner sleeve 20, one end of which enters the outer sleeve from the containing port and is in snap fit with the outer sleeve 10, and the other end of which is located outside the containing port;

the needle core 30, as shown in fig. 8, is provided with a blood taking needle body 31, and the needle core 30 is rotatably arranged at one end of the inner sleeve along with the inner sleeve along the circumferential direction; and

a spring 40 for providing power for the axial movement of the needle core along the needle core guiding part towards the needle outlet,

wherein:

the inside of the outer sleeve 10 is provided with a step surface 14 adjacent to the needle core guiding part, and the needle core 30 is provided with an abutting end surface 31 abutting against the step surface 14;

a rotation guide part 15 is arranged in the outer sleeve 10, and a rotation matching part 21 matched with the rotation guide part is arranged at one end of the inner sleeve 20 at the radial outer side; and is also provided with

Based on the axial movement of the inner sleeve 20 toward the needle outlet 11, the rotation engagement portion 21 engages with the rotation guide portion 15 to rotate the inner sleeve 20 in the circumferential direction, and based on the rotation, the abutment end surface 31 is adapted to come away from the step surface 14 into the needle core guide portion 13.

In the present invention, the top trigger is adopted, that is, the mode of pressing the inner sleeve 20 positioned at the top is adopted to make the lancet body emergent, and accordingly, the inner sleeve 20 can be regarded as a key for triggering.

As will be appreciated by those skilled in the art, the inner sleeve 20 is axially movable along the outer sleeve, and after being axially moved into position, the inner sleeve 20 may be rotated relative to the outer sleeve 10 by at least one angle (which may allow the abutment end surface 31 to exit the step surface 14 into the core guide 13).

The inner sleeve 20 is snap-fit with the outer sleeve 10, meaning that there is a mating structure between the inner sleeve 20 and the outer sleeve 10 after the inner sleeve 20 axially enters the outer sleeve 10 from the receiving port 12 such that the inner sleeve 20 cannot or is difficult to withdraw or withdraw from the receiving port 12 of the outer sleeve 10. However, as will be appreciated by those skilled in the art, because the present invention requires that the inner sleeve 20 be rotatable relative to the outer sleeve after entering the outer sleeve 10, the inner sleeve 20 may also be rotated relative to the outer sleeve by the at least one angle after the snap fit.

Referring to fig. 8, the snap-fit on the inner sleeve 20 is an elastic snap 22 (corresponding to an elastic snap structure); as shown in fig. 6, the outer jacket 10 is provided with an inner jacket guide 16, and the inner jacket guide 16 is a guide groove recessed from the inner wall of the outer jacket 10. The inner sleeve guide 16 serves as a guide structure for mounting the inner sleeve 20 into the outer sleeve 10, and as a receiving portion for receiving the elastic hook 22.

In one exemplary embodiment, as shown in fig. 1, the elastic hooks 22 are exposed from the inner housing guide 16 to the outside of the outer housing, so that the inner housing guide 16 does not block the rotation of the elastic hooks 22. As shown in fig. 1, in order to further reduce the rotational obstruction of the outer jacket 10 to the inner jacket guide 16, the outer jacket 10 is further provided with a relief slope 17.

Although not shown, in an exemplary embodiment, the elastic hooks 22 may not be exposed from the inner sleeve guide 16 to the outside of the outer sleeve 10, and specifically, a space (for example, a rotation groove or other space form of a recess) for circumferential rotation of the elastic hooks 22 may be provided below the inner sleeve guide 16 on the inner wall of the outer sleeve 10.

It should also be noted that the snap-fit element of the present invention is not limited to the resilient hook 22. For example, a blocking rib and a moving space for the snap fit piece to move circumferentially are arranged on the inner wall of the outer sleeve below the blocking rib, the snap fit piece on the inner sleeve is a flange, one side of the flange is an inclined plane for facilitating the inner sleeve to pass over the blocking rib, the other side of the flange is a vertical plane for preventing the inner sleeve from being pulled away from the outer sleeve, and the flange passing over the blocking rib is positioned in the moving space.

It is within the scope of the present invention to provide a snap fit structure that resists removal of the inner sleeve from the outer sleeve and allows the inner sleeve to rotate through an angle relative to the outer sleeve.

In an exemplary embodiment of the present invention, the spring 40 may be in a compressed state when the lancet is not yet used, for example, see fig. 2 and 3. In the case where only one spring is provided and the spring is a compression spring, the spring 40 is provided between the needle core 30 (a spring mounting portion for fixing one end of the spring 40 is provided on the needle core) and one end of the inner sheath 20 inside the inner sheath 20, and the other end of the compression spring is fixed to the inner end surface of one end of the inner sheath 20. As will be appreciated by those skilled in the art, where the compression spring provides only the spring force to eject the needle, and yet another extension spring provides to pull the needle back, the compression spring may also be secured to the needle and the inner sleeve only against the needle and the inner sleeve, rather than at both ends; in addition, an extension spring may be provided on a side close to the needle outlet, and the extension spring may provide an elastic force for ejecting the lancet body and an elastic force for pulling back the ejected needle body. Which are all within the scope of the present invention.

The rotation fitting portion and the rotation guide portion according to an exemplary embodiment of the present invention are described below.

The rotation engagement portion 21 is provided on the inner sleeve 20, and the rotation guide portion 15 is provided on the outer sleeve 10.

As shown in fig. 6 and 9, the rotation guide 15 includes an inclined surface 151; the rotational engagement portion 21 includes an engagement flange 211 protruding radially outwardly from the inner sleeve, as shown in fig. 9, the engagement flange 211 being adapted to engage the inclined surface 151.

As shown in fig. 2, 8, in one exemplary embodiment, the needle 30 has a radially protruding needle protrusion 32, the needle protrusion 32 having the abutment end face 31; the inner sleeve 20 has a core slot 23 which accommodates the core protrusion 32 and allows the core protrusion 32 to move axially therein, as shown in fig. 8, the radially extending end edges of the housing of the inner sleeve 20 forming the core slot 23 forming the mating flange.

As shown in fig. 9, in an exemplary embodiment, the inside of the outer jacket is provided with inclined ribs, the rotation guide 15 includes the inclined ribs, and the inclined ribs protrude radially inward and have the inclined surface 151.

Further, as shown in fig. 9, the inclined surface 151 is located outside the core guide 13 in the radial direction.

Although not shown, in an alternative embodiment, the rotation guide is an inclined guide groove; the rotary fitting portion is a fitting projection projecting radially outwardly from the inner jacket, the fitting projection being adapted to move within the inclined guide groove.

In an alternative embodiment, as shown in fig. 1 and 2, the needle core 30 may further include a needle cap 33 provided on the lancet body, the needle cap 33 penetrating the outer sheath 10 through the needle outlet 11. As shown in fig. 8, the needle cap 33 has a cap hanging table 331. As shown in fig. 2, the cap hanging table 331 abuts against an inner end surface of one end of the outer jacket 10 based on potential energy of the spring 40. As shown in fig. 7, the needle outlet 11 is provided with an open channel allowing the cap hanging table 331 to pass only in a specific orientation.

As shown in fig. 2, in the case where the cap hanging table 331 abuts against the inner end face of one end of the outer jacket 10, the abutting end face 31 is spaced apart from the step face 14 in the axial direction.

As shown in fig. 3, when the cap 33 is removed from the lancet, the abutment end surface 31 axially moves to abut against the stepped surface 14 based on the elastic force of the spring.

As shown in fig. 3, a step 18 may also be provided in the housing defining the position of the needle 30 in the housing for preventing further axial movement of the needle. In an exemplary embodiment, a step 18 may be provided at the bottom of the core guide 13.

The assembly of the lancet of the present invention is exemplarily described as follows.

First, the other end of the spring 40 is mounted on the protrusion 24 at the inner end surface of the inner sleeve 20, and one end of the spring 40 is mounted on the mounting protrusion of the needle core 30.

Next, the core 30 is placed in the inner sleeve 20 such that the core protrusions 32 enter the core grooves 23 of the inner sleeve 20, and the core grooves 23 also play a guiding role, as shown in fig. 8.

Again, the combination of the core and the inner sleeve 20 of fig. 8 (the needle cap 33 of fig. 1 and 2 is not shown) is inserted into the outer sleeve 10 from the receiving port 12 of the outer sleeve 10, such that the elastic hooks 22 on the inner sleeve 20 are positioned in the inner sleeve guide portion 16 on the outer sleeve 10, and the elastic hooks 22 are elastically deformed radially inward; with further insertion of the inner sleeve 20, the elastic hooks 22 protrude from the inner sleeve guide grooves 16 to the outside of the outer sleeve 10, and the elastic hooks 22 elastically deform radially outward, so that the inner sleeve 20 is snap-fitted on the outer sleeve 10, at this time, the needle cap 33 protrudes from the needle outlet of the outer sleeve, and at the same time, the needle cap hanging stand 331 of the needle cap 33 abuts against the inner end surface at the needle outlet of the outer sleeve due to the urging of the spring 40, as shown in fig. 1 and 2.

The blood sampling operation of the lancet according to the present invention is exemplarily described as follows.

First, the needle cap 33 is removed from the lancet (e.g., by screwing) exposing the needle 34 or the needle tip. After removing the cap 33, the inner sleeve 2 loses the support of the cap hanging table 331 at both sides of the cap. At this time, since the cap hanging table 331 is not abutted against the inner end surface of the outer sleeve at the needle outlet, the abutment end surface 31 is axially moved by the elastic force of the spring 40 to abut against the step surface 14, as shown in fig. 3. At this time, the lancet is in a state to be emitted. The needle cap 33 also serves to prevent false firing.

Next, the inner sleeve 20 is pressed so that the inner sleeve 20 moves axially inward, and during the movement, the radially extending end edge (corresponding to the fitting flange 211) of the housing in which the inner sleeve 20 forms the core groove 23 moves to a position close to the inclined surface 151 on the inclined rib as the rotation guide portion, as shown in fig. 9 (fig. 9 shows a state before the fitting flange 211 contacts with the inclined surface 151).

Thirdly, the inner sleeve 20 is further pressed, so that the matching flange 211 slides on the inclined surface 151, the inner sleeve 20 axially moves and simultaneously rotates, the inner sleeve 20 rotates to drive the needle core 30 to rotate, the abutting end surface 31 of the needle core 30 leaves the step surface 14 and enters the starting end of the needle core guiding part 13, then the needle core is ejected under the action of the elastic force of the spring 40, as shown in fig. 4, the needle head of the blood taking needle body is exposed out of the needle outlet, and the skin of a patient is punctured. The needle is then retracted into the housing to complete the blood collection, as shown in fig. 5, due to the tension of the spring 40.

The used needle core cannot be restored to the original position, so that secondary use is avoided.

According to the blood taking needle, the mode of pressing the inner sleeve positioned at the top of the blood taking needle is adopted to trigger the emission of the needle body, so that the problem that the blood taking needle is too deep to penetrate into the skin of a patient due to integral pressing is avoided, and blood taking operation is simplified.

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 top-pressing lancet comprising:

wherein:

2. The lancet according to claim 1, wherein:

the rotation guide portion includes an inclined surface;

the rotational engagement portion includes an engagement flange projecting radially outwardly from the inner sleeve, the engagement flange being adapted to engage the inclined surface.

3. The lancet according to claim 2, wherein:

the needle core is provided with a radially protruding needle core protrusion, and the needle core protrusion is provided with the abutting end face;

the inner sleeve has a core slot that receives the core protuberance and allows the core protuberance to move axially therein, and the radially extending end edges of the housing that form the core slot form the mating flange.

4. The lancet according to claim 2, wherein:

the inside inclined rib that is provided with of overcoat, rotatory guide portion includes the inclined rib, just the radial inwards protrusion of inclined rib just has the inclined plane.

5. The lancet according to claim 2, wherein:

the inclined surface is located outside the core guide in a radial direction.

6. The lancet according to claim 1, wherein:

the rotation guide part is an inclined guide groove;

the rotary fitting portion is a fitting projection projecting radially outwardly from the inner jacket, the fitting projection being adapted to move within the inclined guide groove.

7. The lancet according to claim 1, wherein:

the spring is arranged between the needle core and one end of the inner sleeve in the inner sleeve.

8. The lancet according to claim 1, wherein:

the outer sleeve is provided with an inner sleeve guide part;

one end of the inner sleeve is provided with an elastic buckling structure, and the elastic buckling structure is suitable for moving along the inner sleeve guide part and is suitable for buckling and matching with the outer sleeve.

9. The lancet according to claim 1, wherein:

the needle core also comprises a needle cap arranged on the blood taking needle body, the needle cap penetrates out of the outer sleeve through the needle outlet, the needle cap is provided with a needle cap hanging table, and the needle cap hanging table is abutted against the inner end surface of one end of the outer sleeve based on the potential energy of the spring;

the needle outlet is provided with an open channel which allows the needle cap hanging table to pass through only in a specific direction.

10. The lancet of claim 9, wherein:

in the case where the cap mount abuts against an inner end face of one end of the outer sleeve, the abutment end face is spaced apart from the step face in the axial direction; and is also provided with

The abutment end surface axially moves to abut against the stepped surface based on the elastic force of the spring in a state where the needle cap is removed from the lancet.