CN215651136U

CN215651136U - Blood sampling pen structure capable of effectively improving motion speed of piston

Info

Publication number: CN215651136U
Application number: CN202121774924.9U
Authority: CN
Inventors: 王炜; 姚费杰; 王丽江
Original assignee: Hangzhou Anokai Medical Technology Co ltd
Current assignee: Hangzhou Anokai Medical Technology Co ltd
Priority date: 2021-08-02
Filing date: 2021-08-02
Publication date: 2022-01-28
Anticipated expiration: 2031-08-02

Abstract

The utility model provides an effectively promote blood sampling pen structure of piston velocity of motion, from the front to back in proper order including out needle portion, a body portion and back cap, a body portion inner chamber is equipped with mobilizable piston assembly, back cap includes the back fixed lid, back is according to lid and push rod, back fixed lid is fixed in a body portion rear end, piston assembly passes through main spring with back fixed lid front end and is connected, and back is according to the lid and is the cylindric and with a body portion mobilizable insert spacing of taking the open-ended, and push rod rear end is fixed according to lid rear end with the back, and the front end passes the back fixed lid, back fixed lid rear end outer wall is equipped with protruding muscle, and back is equipped with axial recess according to the lid inner wall, and protruding muscle is located the recess after the assembly for back is according to lid and push rod can only follow axial motion and unanimous with piston assembly direction of motion. The structure of the utility model can quickly discharge air in the inner cavity of the pen body at the rear side of the piston, reduce the resistance of the piston, effectively improve the motion speed of the piston and achieve the effect of improving the negative pressure strength of the inner cavity of the pen body at the front side of the piston.

Description

Blood sampling pen structure capable of effectively improving motion speed of piston

Technical Field

The utility model relates to the technical field of medical blood sampling equipment, in particular to a blood sampling pen structure capable of effectively improving the motion speed of a piston.

Background

The blood sampling pen is a pen-shaped hemostix, and is an auxiliary blood sampling device which is matched with a disposable sterile blood sampling needle to collect peripheral blood samples of a human body. Peripheral blood collection is a method in which a peripheral blood supply rich region such as a fingertip is punctured with a blood collection pen to puncture the skin and obtain peripheral blood, and the amount of blood collected is not large.

The existing negative pressure blood sampling pen can generate negative pressure through the movement of an internal piston during blood sampling, so that the pain is effectively reduced. The magnitude of the negative pressure intensity is influenced by the movement speed of the piston, the movement speed of the piston is influenced by the elastic force of the spring and the resistance of the piston, and the resistance of the piston of the current negative pressure blood sampling pen is larger, so that the generated negative pressure intensity effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems in the prior art, and provides a blood sampling pen structure capable of effectively increasing the movement speed of a piston, which can quickly exhaust air in an inner cavity of a pen body at the rear side of the piston, reduce the resistance of the piston, increase the speed of the piston and achieve the effect of improving the negative pressure strength of the inner cavity of the pen body at the front side of the piston.

In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:

the utility model provides an effectively promote blood sampling pen structure of piston velocity of motion, from the front to back in proper order including out needle portion, a body portion and back cap, a body portion inner chamber is equipped with mobilizable piston assembly, back cap includes the back fixed lid, back is according to lid and push rod, back fixed lid is fixed in a body portion rear end, piston assembly passes through main spring with back fixed lid front end and is connected, and back is according to the lid and is the cylindric and with a body portion mobilizable insert spacing of taking the open-ended, and push rod rear end is fixed according to lid rear end with the back, and the front end passes the back fixed lid, back fixed lid rear end outer wall is equipped with protruding muscle, and back is equipped with axial recess according to the lid inner wall, and protruding muscle is located the recess after the assembly for back is according to lid and push rod can only follow axial motion and unanimous with piston assembly direction of motion. The convex ribs and the grooves play a role in keeping axial movement all the time for circumferential limiting and rotation stopping of the rear pressing cover and the push rod, and resistance is reduced.

Preferably, the number of the convex ribs is at least one, and the number of the grooves corresponds to the number of the convex ribs. When the number of the convex ribs is more than or equal to two, the convex ribs can be distributed at equal intervals.

Preferably, the structure of the convex rib and the groove can be mutually replaced, namely, the outer wall of the rear end of the rear fixing cover is provided with a groove, and the inner wall of the rear pressing cover is provided with a convex rib.

Preferably, a retaining spring is sleeved on the push rod positioned at the rear side of the rear fixing cover. The holding spring is respectively abutted against the rear fixed cover and the rear pressing cover, when the rear pressing cover is not subjected to external force, the rear pressing cover and the push rod are positioned at a distance extending out of the pen body, and before the piston assembly moves to touch the push rod, the resistance is only the friction force between the inner wall of the pen body and the airtight ring on the piston except air.

Preferably, the push rod positioned at the front side of the rear fixing cover is sleeved with a following spring. The function is as follows: a. the buffer function is realized when the piston assembly moves to touch the push rod, and the impact sound during the contact can be reduced; b. when the piston assembly is positioned on the front side and does not act with the push rod, the rear pressing cover extends out of the pen body for a certain length and is kept, when the piston assembly moves to the rear side and acts with the push rod, the rear pressing cover continues to extend out of the pen body for a certain length and is kept under the interaction of the main spring and the following spring, the rear pressing cover has two different extending lengths, and the mark is arranged at the corresponding position of the outer wall of the rear pressing cover in a combined mode, so that the function of marking the working state of the piston assembly can be achieved.

Preferably, the rear fixing cover is provided with a vent hole a communicated with the inner cavity of the pen body. When the piston assembly is released and the main spring pulls the piston to move towards the direction far away from the needle outlet part, the air hole a can quickly discharge air in the section of the pen body inner cavity from the piston to the rear fixing cover, and the resistance force on the piston is reduced.

Preferably, the number of the vent holes a is at least one. When the number of the vent holes a is greater than or equal to two, the vent holes a may be equidistantly distributed.

Preferably, the rear press cover is provided with at least one vent hole b for communicating the inside and the outside of the rear press cover. The vent hole b is communicated with the inner cavity of the press cover and the outside atmosphere to balance the pressure of the press cover and the outside atmosphere.

The utility model has the beneficial effects that: 1. the structure of the utility model can quickly discharge air in the inner cavity of the pen body at the rear side of the piston, reduce the resistance of the piston, effectively improve the motion speed of the piston and achieve the effect of improving the negative pressure strength of the inner cavity of the pen body at the front side of the piston.

2. The structure of the convex rib and the groove ensures that the rear press cover and the push rod keep axial movement, and has the following functions: a. when the push rod pushes the piston assembly, the piston assembly always keeps axial movement, and resistance increase or air leakage caused by deformation of an airtight ring structure on the piston is avoided; b. when the piston assembly works and moves backwards, the push rod is impacted at the rear moving section and pushes the rear pressing cover and the push rod to move backwards, the moving directions of the rear pressing cover and the push rod and the piston assembly are kept in alignment, and resistance is reduced;

3. the movement directions of the rear pressing cover and the push rod and the piston are kept in alignment, and the push rod is not connected with the piston and is far away from the piston before the piston moves to generate negative pressure, so that the push rod cannot form resistance to the movement of the piston, and the piston can obtain higher sliding speed, thereby obtaining better negative pressure effect.

Drawings

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

FIG. 3 is an exploded view of the rear cover part in the present invention;

FIG. 4 is a perspective view of the rear mounting cover of the present invention;

FIG. 5 is a rear view of the rear retaining cap of the present invention;

FIG. 6 is a perspective view of the rear push cap of the present invention.

In the figure: 10. a needle outlet part; 20. a pen body part; 21. a piston assembly; 22. a main spring; 30. a rear cover portion; 31. a rear fixing cover; 31.1, convex ribs; 31.2, a vent hole a; 32. then pressing the cover; 32.1, a groove; 32.2, vent hole b; 33. a push rod; 34. a retention spring; 35. following the spring.

Detailed Description

The utility model will be further illustrated by the following description and the accompanying drawings.

The implementation mode is as follows: as shown in figures 1-2, a blood sampling pen structure for effectively increasing the movement speed of a piston comprises a needle outlet part 10, a pen body part 20 and a rear cover part 30 from front to back, wherein a movable piston assembly 21 is arranged in an inner cavity of the pen body part 20.

Referring to fig. 2-3, the rear cap portion 30 includes a rear fixing cap 31, a rear pressing cap 32 and a push rod 33, the rear fixing cap 31 is fixed to the rear end of the pen body portion 20, the piston assembly 21 is connected to the front end of the rear fixing cap 31 through a main spring 22, the rear pressing cap 32 is cylindrical with an opening at the front end and movably inserted into the pen body portion 20 for limiting, the rear end of the push rod 33 is fixed to the rear end of the rear pressing cap 32, and the front end of the push rod passes through the rear fixing cap 31.

Referring to fig. 4-6, the rear fixing cover 31 has a rib 31.1 on the outer wall of the rear end, the rear pressing cover 32 has an axial groove 32.1 on the inner wall, and the rib 31.1 is located in the groove 32.1 after assembly, so that the rear pressing cover 32 and the push rod 33 can only move axially and in the same direction as the piston assembly 21. Wherein, the quantity of rib 31.1 is at least one, and the quantity of recess 32.1 corresponds with rib 31.1 quantity.

In the present embodiment, the rib 31.1 and groove 32.1 structures are interchangeable.

Referring to fig. 4-5, the rear fixing cap 31 is provided with a vent hole a31.2 communicating with the inner cavity of the pen body 20. Wherein, the number of the vent holes a31.2 is at least one. As shown in fig. 6, the rear push cap 32 is provided with at least one vent hole b32.2 for communicating the inside and outside of the rear push cap 32.

As shown in fig. 2 to 3, the push rod 33 located at the rear side of the rear fixing cover 31 is sleeved with a holding spring 34, and the push rod 33 located at the front side of the rear fixing cover 31 is sleeved with a following spring 35.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the utility model should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the teachings herein.

Claims

1. The utility model provides an effective blood sampling pen structure of promoting piston velocity of motion, from the front to back in proper order including out needle portion (10), body of a pen portion (20) and back cap (30), body of a pen portion (20) inner chamber is equipped with mobilizable piston assembly (21), back cap (30) are including back fixed lid (31), back is according to lid (32) and push rod (33), back fixed lid (31) are fixed in body of a pen portion (20) rear end, piston assembly (21) are passed through main spring (22) with back fixed lid (31) front end and are connected, it is cylindric and close spacingly with the mobilizable inserting of body of a pen portion (20) that back is according to lid (32), push rod (33) rear end is fixed according to lid (32) rear end with the back, the front end passes back fixed lid (31), its characterized in that: the outer wall of the rear end of the rear fixing cover (31) is provided with a convex rib (31.1), the inner wall of the rear pressing cover (32) is provided with an axial groove (32.1), and the convex rib (31.1) is positioned in the groove (32.1) after assembly, so that the rear pressing cover (32) and the push rod (33) can only move along the axial direction and are consistent with the movement direction of the piston assembly (21).

2. The lancing device structure according to claim 1, wherein the lancing device comprises: the number of the convex ribs (31.1) is at least one, and the number of the grooves (32.1) corresponds to the number of the convex ribs (31.1).

3. The lancing device structure according to claim 2, wherein the lancing device comprises: the structures of the convex ribs (31.1) and the concave grooves (32.1) can be mutually replaced.

4. The lancing device structure according to claim 1, wherein the lancing device comprises: a retaining spring (34) is sleeved on the push rod (33) positioned at the rear side of the rear fixing cover (31).

5. The lancing device structure according to claim 1, wherein the lancing device comprises: a following spring (35) is sleeved on the push rod (33) positioned at the front side of the rear fixing cover (31).

6. The lancet structure for effectively increasing the moving speed of the piston according to any one of claims 1 to 5, wherein: the rear fixing cover (31) is provided with a vent hole a (31.2) communicated with the inner cavity of the pen body part (20).

7. The lancing device structure according to claim 6, wherein the lancing device comprises: the number of the vent holes a (31.2) is at least one.

8. The lancing device structure according to claim 6, wherein the lancing device comprises: the rear pressing cover (32) is provided with at least one vent hole b (32.2) for communicating the inside and the outside of the rear pressing cover (32).