CN109199406B

CN109199406B - Vacuum blood collection tube with adjustable negative pressure

Info

Publication number: CN109199406B
Application number: CN201810766772.4A
Authority: CN
Inventors: 逄璐; 李海霞
Original assignee: Peking University First Hospital
Current assignee: Peking University First Hospital
Priority date: 2018-07-13
Filing date: 2018-07-13
Publication date: 2021-03-16
Anticipated expiration: 2038-07-13
Also published as: CN109199406A

Abstract

The invention discloses a vacuum blood collection tube with adjustable negative pressure, which comprises: the device comprises a pipe body and a sealing plug for plugging the pipe orifice of the pipe body, wherein the pipe body is provided with a negative pressure cavity isolated from the outside and a pressure regulating cavity communicated with the outside; wherein, the vacuum test tube still includes: the piston is hermetically arranged in the tube body and divides the tube body into the negative pressure cavity and the pressure regulating cavity; and the sliding buckle is connected with the piston and used for driving the piston to slide along the inner wall of the pipe body towards the direction of the pressure regulating cavity, so that the volume of the negative pressure cavity is increased. The invention can manually increase the negative pressure during the blood sampling process of medical personnel, ensures the blood sampling volume and has simple operation.

Description

Vacuum blood collection tube with adjustable negative pressure

Technical Field

The invention relates to the technical field of medical instruments, in particular to a vacuum blood collection tube with adjustable negative pressure.

Background

The existing vacuum blood collection tube comprises a tube body and a sealing plug, wherein the tube body and the sealing plug form a closed vacuum tube cavity. The vacuum degree in the vacuum tube cavity can be reduced when the vacuum blood collection tube is placed for a long time, so that the negative pressure in the vacuum blood collection tube is reduced, and the consequence that a sufficient amount of blood samples cannot be collected is caused.

The existing treatment methods mainly comprise the following steps: 1. discarding the vacuum blood collection tube with reduced negative pressure; this approach results in wasted resources and wasted blood samples, which is less acceptable to the patient; 2. a blood sample of a patient is extracted through an injector and then is injected into a vacuum blood collection tube; this mode complex operation, the needle stick wound takes place easily, and the patient needs to carry out venipuncture once more, and the acceptability is poor.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a vacuum blood collection tube with adjustable negative pressure, so that medical personnel can manually increase the negative pressure in the blood collection process, the blood collection amount is ensured, and the operation is simple.

In order to achieve the above object of the present invention, the following technical solutions are provided:

an adjustable negative pressure vacuum blood collection tube, comprising: the device comprises a pipe body and a sealing plug for plugging the pipe orifice of the pipe body, wherein the pipe body is provided with a negative pressure cavity isolated from the outside and a pressure regulating cavity communicated with the outside; wherein, the vacuum test tube still includes: the piston is hermetically arranged in the tube body and divides the tube body into the negative pressure cavity and the pressure regulating cavity; and the sliding buckle is connected with the piston and used for driving the piston to slide along the inner wall of the pipe body towards the direction of the pressure regulating cavity, so that the volume of the negative pressure cavity is increased.

Preferably, a sliding groove is formed in the pipe wall of the pipe body containing the pressure regulating cavity, and the pressure regulating cavity is communicated with the outside through the sliding groove.

Preferably, the slide fastener includes: the hand clasping part is used for supporting the finger pulp and is positioned outside the tube body; a sliding part which can slide along the sliding groove and is connected between the handle part and the piston 3; wherein, the sliding part passes through the chute and is connected with the handle part.

Preferably, the sliding grooves are at least two and symmetrically arranged, and the buckling hand parts and the sliding grooves are correspondingly arranged.

Preferably, the maximum sliding stroke of the piston is less than or equal to the length of the sliding chute.

Preferably, the piston is arranged away from the nozzle of the tube body.

Preferably, the surface of the hand clasping part for supporting the finger pulp is provided with an arc shape matched with the finger pulp.

The beneficial effects of the invention are embodied in the following aspects:

1) the vacuum blood collection tube can immediately apply force to the handle part to pull the piston when insufficient negative pressure is found in the blood collection process, and reduce the air pressure in the cavity by increasing the volume of the negative pressure cavity, so that the purpose of increasing the negative pressure is achieved, the sufficient blood collection amount is ensured, the operation is simple and convenient, and a patient does not feel uncomfortable;

2) the vacuum blood collection tube is provided with the symmetrically distributed buckling parts, so that two fingers of medical staff can operate simultaneously conveniently, the force application is uniform, the piston moves smoothly, and the clamping stagnation is avoided.

Drawings

FIG. 1 is a schematic structural view of a vacuum blood collection tube with adjustable negative pressure according to a first embodiment of the present invention;

FIGS. 2 and 3 are views showing the state of use of the first embodiment of the vacuum blood collection tube with adjustable negative pressure;

FIG. 4 is a cross-sectional view A-A shown in FIG. 1;

FIG. 5 is a sectional view of a second embodiment of the vacuum blood collection tube with adjustable negative pressure according to the present invention.

Description of reference numerals: 1-a pipe body; 1 a-a chute; 11-a negative pressure cavity; 12-a pressure regulating cavity; 2-sealing plug; 3-a piston; 4-sliding the handle; 41-buckling the hand; 42-a sliding part; 421-a slide bar; 422-connecting rod.

Detailed Description

When the blood sampling device is used for sampling blood, once the negative pressure is not enough and the blood sampling can not be continued, medical personnel can immediately increase the negative pressure manually, so that the sufficient blood sampling amount is ensured, and the operation is simple and quick.

As shown in figure 1, the invention provides a negative pressure adjustable vacuum blood sampling tube, medical personnel can increase the negative pressure manually in the blood sampling process, it includes: a pipe body 1; a sealing plug 2 for plugging the pipe orifice of the pipe body 1; the piston 3 is far away from the pipe orifice and is arranged in the pipe body 1 in a sealing way; a sliding catch 4 connected to the piston 3.

The lower part of the pipe body 1 far away from the pipe orifice is communicated with the outside, the pipe body 1 is divided into a negative pressure cavity 11 and a pressure regulating cavity 12 which are respectively positioned at two sides of a piston 3 through the piston 3 which is arranged in the pipe body 1 in a sealing way, the negative pressure cavity 11 is isolated from the outside, and the pressure regulating cavity 12 is communicated with the outside; when the sliding handle 4 drives the piston 3 to slide along the inner wall of the tube body 1 towards the pressure regulating cavity 12, the volume of the negative pressure cavity 11 can be increased, so that the air pressure in the negative pressure cavity 11 is reduced, the negative pressure of the negative pressure cavity 11 is increased, and the purpose of continuously taking blood by utilizing the negative pressure is realized.

The details of the structure and operation of the present invention are described in detail below with reference to the accompanying drawings and examples.

Example one

As shown in fig. 1 to 4, the negative pressure chamber 11 of the present embodiment is located above the piston 3 and is formed by sealing the piston 3, the upper portion of the tube 1 and the sealing plug 2.

The pressure regulating cavity 12 is positioned below the piston 3 and is formed by the piston 3 and the lower part of the tube body 1. Specifically, as shown in fig. 1, a sliding groove 1a is formed in a pipe wall of a lower portion of the pipe body 1 forming the pressure regulating cavity 12, and the pressure regulating cavity 12 is communicated with the outside through the sliding groove 1 a.

In addition, when the sliding handle 4 drives the piston 3 to move, the sliding handle 4 slides along the sliding groove 1a, and the sliding groove 1a plays a limiting and guiding role for the sliding handle 4. As shown in fig. 1, the slide fastener 4 includes: a handle part 41 for supporting the finger abdomen, which is positioned outside the tube body 1; a sliding portion 42 slidable along the chute 1 a. Wherein, the sliding part 42 is connected between the handle part 41 and the piston 3; when the gripping portion 41 moves downward under the pressure of the finger pulp, the sliding portion 42 is caused to slide along the sliding groove 1a, and the piston 3 is caused to move along the inner wall of the tube 1.

Specifically, the sliding groove 1a of the present embodiment penetrates through the wall of the tube, so that the sliding portion 42 extends from the inside of the tube 1 to the outside of the tube 1 and is connected to the handle 41. In practice, the sliding groove 1a may be elongated from top to bottom to limit the sliding of the sliding portion 42 from top to bottom.

When the piston 3 moves downwards, the interaction force between the piston and the pipe wall is uniformly distributed, so that the piston 3 can slide downwards easily, and the phenomenon of clamping stagnation in the sliding process is avoided. When a uniform downward pulling force is applied to the piston 3, the interaction force between the piston 3 and the pipe wall is uniformly distributed. Therefore, as shown in fig. 1 and 4, the present embodiment symmetrically provides two sliding chutes 1a, and correspondingly provides two handle portions 41. When force is applied to the two symmetrically arranged handle parts 41 simultaneously, the piston 3 is uniformly stressed and slides down easily.

In specific implementation, in order to facilitate the application of force to the finger pulp, the surface of the hand fastening part 41 is designed into a concave arc shape matched with the finger pulp; and the concave arc is in a shape with a low middle and high ends, so that the finger pulp can be prevented from sliding to two sides to influence the force application.

It should be noted that the maximum sliding stroke of the piston 3 is less than or equal to the length of the chute 1a, so as to avoid blood leakage when the upper end surface of the piston 3 enters the chute 1 a.

Among them, the sliding portion 42 of the present embodiment includes: a slide bar 421, both ends of which extend out of the tube body 1 through the two chutes 1a and are respectively connected with the two handle parts 41; a connecting rod 422 connecting the sliding rod 421 and the piston 3 is arranged centrally between the sliding rod 421 and the piston 3 in order to force the piston evenly. When in implementation, the length of the connecting rod 422 can be reasonably set to prevent the upper end surface of the piston 3 from entering the chute 1 a.

As shown in fig. 1, in this embodiment, before blood collection, since the pressure regulating chamber 12 is communicated with the outside, the pressure regulating chamber 12 is at normal atmospheric pressure, and under the action of atmospheric pressure, the upper end surface of the sliding rod 421 abuts against the uppermost end of the sliding groove 1a and does not slide. When the negative pressure is found to be insufficient during blood collection, the handle portion 41 is operated to move the slide bar 421 downward along the slide groove 1 a.

Fig. 2 and 3 are schematic diagrams of the process of increasing the negative pressure by moving the sliding rod 421 (piston 3) downward when the negative pressure in the negative pressure chamber 11 is insufficient. When the negative pressure is found to be insufficient in the blood sampling process and the blood sampling cannot be continued, the medical staff buckle the two finger abdomens to buckle the buckle hand part 41 to apply the downward pressure, along with the downward movement of the piston 3, the volume in the negative pressure cavity 11 is increased, the internal air pressure is reduced, the blood flows into the negative pressure cavity 11 under the action of the pressure difference, and when the blood sampling quantity is met, the piston 3 can be stopped moving downwards. Whether the blood sampling amount is enough can be judged by setting scales on the tube wall. Fig. 2 is a schematic diagram of blood collection when the sliding bar 421 moves to the middle-lower section of the chute 1 a; fig. 3 is a schematic view showing the blood collection when the sliding bar 421 moves to the bottom of the chute 1 a.

Example two

In the blood collection process, if the positions of the two grasping portions 41 are deviated from the directions of the two fingers of the medical staff too much, for example, when the two fingers are directed, it is necessary to smoothly grasp the two grasping portions 41 by rotating the tube body or adjusting the direction.

In order to make the operation of the medical staff more convenient and handy, as shown in fig. 5, four sliding grooves 1a are formed on the tube body 1 in the embodiment, and the two sliding grooves are symmetrical. Preferably, the interval between two adjacent sliding chutes 1a is 90 degrees; and four handle portions 41 are correspondingly provided.

In use, a finger is supported on the pair of gripping parts 41 in a handy manner according to the position of each pair of gripping parts 41.

The rest of the structure of this embodiment is the same as that of the first embodiment, and is not described again.

Although the present invention has been described in detail, the present invention is not limited thereto, and those skilled in the art can modify the principle of the present invention, and thus, various modifications made in accordance with the principle of the present invention should be understood to fall within the scope of the present invention.

Claims

1. An adjustable negative pressure vacuum blood collection tube, comprising: body and shutoff are in the sealing plug of the mouth of pipe department of body, its characterized in that still includes:

the piston is hermetically arranged in the tube body and can slide along the inner wall of the tube body with a constant diameter, and divides the interior of the tube body into a negative pressure cavity isolated from the outside and a pressure regulating cavity communicated with the outside;

the sliding chute is arranged on the pipe body which is internally divided with the negative pressure cavity and the pressure regulating cavity and is positioned on the pipe wall of the lower part of the pipe body which forms the pressure regulating cavity;

connect sealed the setting in the pipe the piston just can follow the gliding slip attacker of spout, it drives sealed the setting in the pipe when sliding along the spout the piston is followed the body inner wall to pressure regulating chamber direction slides to increase negative pressure chamber's volume.

2. The vacuum blood collection tube with adjustable negative pressure of claim 1, wherein the sliding clasp comprises:

the hand clasping part is used for supporting the finger pulp and is positioned outside the tube body;

a sliding part which can slide along the sliding groove and is connected between the handle part and the piston;

wherein, the sliding part passes through the chute and is connected with the handle part.

3. The vacuum blood collection tube with adjustable negative pressure according to claim 2, wherein the sliding grooves are at least two and symmetrically arranged, and the handle portion is arranged corresponding to the sliding grooves.

4. The evacuated blood collection tube with adjustable negative pressure of claim 3, wherein the maximum sliding stroke of the piston is less than or equal to the length of the sliding groove.

5. The evacuated blood collection tube with adjustable negative pressure of claim 1, wherein the piston is disposed away from the nozzle of the tube body.

6. The vacuum blood collection tube with adjustable negative pressure of claim 2, wherein the surface of the hand clasping part for supporting the finger pulp has an arc shape matched with the finger pulp.