CN215460992U

CN215460992U - Novel keep somewhere needle anti-return device

Info

Publication number: CN215460992U
Application number: CN202121277122.7U
Authority: CN
Inventors: 黄彬
Original assignee: Youjiang Medical University for Nationalities Affiliated Hospital
Current assignee: Youjiang Medical University for Nationalities Affiliated Hospital
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-01-11
Anticipated expiration: 2031-06-08

Abstract

The utility model relates to the technical field of medical instruments, in particular to a novel anti-backflow device for an indwelling needle, which comprises an upper cavity, a lower cavity and an elastic part, wherein the bottom wall of the upper cavity is communicated with the top wall of the lower cavity, the top wall of the upper cavity is provided with a through hole, the interior of the upper cavity is communicated with an upper infusion tube through the through hole, and one end of the upper infusion tube, which is far away from the upper cavity, is connected with an infusion bag; the lower end of the elastic part is fixedly connected with the inner bottom wall of the upper cavity, the upper end of the elastic part is provided with a piston rod corresponding to the through hole, and the upper end of the piston rod can automatically close the through hole under the elastic action of the elastic part; the interior of the lower cavity is communicated with a lower infusion tube, and one end of the lower infusion tube, which is far away from the lower cavity, is connected with a needle head. The utility model can automatically prevent venous blood backflow and air from entering when infusion is stopped.

Description

Novel keep somewhere needle anti-return device

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a novel anti-reflux device for an indwelling needle.

Background

The intravenous infusion is the most common nursing operation in clinical nursing work, has the advantages of rapid drug administration, quick curative effect and the like, plays an important role in treating diseases and rescuing patients, and becomes one of the most common and most direct and effective clinical treatment means. A venous indwelling Needle (Needle) is composed of a stainless steel core, a soft outer sleeve and a plastic Needle seat. An infusion tool for puncturing a blood vessel with an outer cannula and a stylet during puncture, withdrawing the stylet after the cannula is fed into the blood vessel, and only leaving the soft outer cannula in the blood vessel for infusion. With the continuous progress of clinical care, the venous indwelling needle is more and more widely applied to clinical transfusion. The use of the vein indwelling needle can relieve the pain of the patient caused by repeated puncture; is beneficial to emergency rescue; but also reduces the times of the puncture operation of nurses and improves the working efficiency.

At present, the tip of present remaining needle sleeve pipe is the opening, does not have closed function, then do not infuse the in-process and easily cause venous blood backward flow and air admission, especially the venous blood of backward flow forms the fritter thrombus in remaining the needle, and then causes the jam of remaining the needle, make liquid can not smooth and easy flow, easily bring the fritter thrombus into blood when the infusion simultaneously, and then form the thrombus, cause harm to the health, consequently need to carry out the work of sealing a tube when stopping the infusion, this greatly increased medical personnel work load.

SUMMERY OF THE UTILITY MODEL

In view of the above problems, the present invention provides a novel anti-reflux device for an indwelling needle, which can automatically prevent venous blood reflux and air from entering when infusion is stopped.

The technical purpose of the utility model is realized by the following technical scheme:

a novel anti-backflow device for an indwelling needle comprises an upper cavity, a lower cavity and an elastic part, wherein the bottom wall of the upper cavity is communicated with the top wall of the lower cavity, a through hole is formed in the top wall of the upper cavity, the interior of the upper cavity is communicated with an upper infusion tube through the through hole, and one end, far away from the upper cavity, of the upper infusion tube is connected with an infusion bag; the lower end of the elastic part is fixedly connected to the inner bottom wall of the upper cavity, the upper end of the elastic part is provided with a piston rod corresponding to the through hole, and the upper end of the piston rod can automatically close the through hole under the elastic action of the elastic part; the interior of the lower cavity is communicated with a lower infusion tube, and one end of the lower infusion tube, which is far away from the lower cavity, is connected with the needle head.

Preferably, the elastic part is a silica gel sleeve, and the silica gel sleeve is made of medical silica gel materials.

Preferably, the elastic part is a pressure spring, a fixing rod is inserted into the pressure spring, and the lower end of the fixing rod is fixedly connected to the middle of the inner bottom wall of the upper cavity.

Preferably, the two sides of the bottom wall in the upper cavity body are symmetrically provided with leakage openings, and the bottom wall of the upper cavity body is communicated with the top wall of the lower cavity body through the leakage openings.

Preferably, a boss is convexly arranged in the middle of the top wall in the upper cavity, and the through hole penetrates through the boss.

Preferably, the upper end of the piston rod is provided with a conical sealing part, and the lower end opening of the through hole is matched with the sealing part in shape.

Preferably, a waterproof layer is laid on the inclined plane of the sealing part.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

according to the novel anti-backflow device for the indwelling needle, when infusion is performed, the elasticity of the elastic part to the piston rod is smaller than the pressure of liquid of the upper infusion tube to the piston rod, so that the upper end of the piston rod is separated from the opening at the lower end of the through hole under the liquid pressure to open the through hole for infusion; when the infusion is stopped, the elasticity of the elastic part to the piston rod is larger than the pressure of the liquid of the upper infusion tube to the piston rod, so that the piston rod can be pushed to enable the end face of the upper end of the piston rod to be abutted against the opening of the lower end of the through hole to close the through hole, and venous blood backflow and air entering are prevented.

Drawings

FIG. 1 is a schematic sectional view of example 1;

FIG. 2 is a schematic sectional view of example 2;

fig. 3 is an overall schematic of the present invention.

In the attached drawings, 1, an upper cavity body; 11. a through hole; 12. a leak port; 13. a boss; 2. a lower cavity; 31. a silica gel sleeve; 32 pressure springs; 321. fixing the rod; 33. a piston rod; 331. a sealing part; 4. an upper infusion tube; 5. and (4) a transfusion tube is arranged.

Detailed Description

The technical solutions of the present invention will be described in detail and fully with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case to those skilled in the art.

Example 1

Referring to fig. 1 and 3, the novel anti-reflux device for the indwelling needle provided by the embodiment comprises an upper cavity 1, a lower cavity 2 and an elastic part, wherein the bottom wall of the upper cavity 1 is communicated with the top wall of the lower cavity 2, a through hole 11 with the diameter of 1cm is formed in the top wall of the upper cavity 1, the inner part of the upper cavity 1 is communicated with an upper infusion tube 4 through the through hole 11, and one end of the upper infusion tube 4, which is far away from the upper cavity 1, is connected with an infusion bag; the lower end of the elastic part is fixedly connected with the inner bottom wall of the upper cavity 1, the upper end of the elastic part is provided with a piston rod 33 corresponding to the through hole 11, the elastic force of the elastic part is set to be 0.3N, the elastic force is equivalent to the pressure (3KPA) of 30cm water column and acts on the pressure generated on the section area (1cm3) of the through hole 11, the height of the water column in the upper infusion tube 4 is more than 30cm during infusion, at the moment, the elastic force of the elastic part on the piston rod 33 is smaller than the pressure of the liquid column, and the upper end of the piston rod 33 is separated from the lower end opening of the through hole 11 under the liquid pressure so as to open the through hole 11 for infusion; when the infusion is stopped, because the human body venous pressure is usually the pressure generated by 5-10cm water column, the water column pressure of the upper infusion tube 4 is gradually balanced to the human body venous pressure (the pressure of 5-10cm water column) which is less than the pressure of 30cm water column, at the moment, the elastic force of the elastic piece to the piston rod 33 is greater than the liquid column pressure, the piston rod 33 can be pushed to enable the end face of the upper end of the piston rod 33 to abut against the opening at the lower end of the through hole 11 to close the through hole 11, and venous blood backflow and air entering are prevented. The lower cavity 2 is internally communicated with a lower infusion tube 5, one end of the lower infusion tube 5, which is far away from the lower cavity 2, is connected with a needle, so that the liquid in the lower cavity 2 can be injected into the vein of a patient from the lower infusion tube 5 through the needle.

Preferably, the elastic component is a silica gel sleeve 31, the silica gel sleeve 31 is made of medical silica gel material, and has good elasticity, and the piston rod 33 can be pushed to enable the end face of the upper end of the piston rod 33 to abut against the opening of the lower end of the through hole 11 so as to close the through hole 11, more importantly, the medical silica gel is safe and non-toxic, and cannot pollute the liquid in the upper cavity 1, wherein the lower edge of the silica gel sleeve 31 is bonded at the central position of the inner bottom wall of the upper cavity 1, and the upper edge is bonded with the bottom of the piston rod 33.

Preferably, leak openings 12 are symmetrically formed in two sides of the bottom wall of the upper cavity 1, and the bottom wall of the upper cavity 1 is communicated with the top wall of the lower cavity 2 through the leak openings 12, so that liquid in the upper cavity 1 can flow into the lower cavity 2 through the leak openings 12.

Preferably, considering that the sealing effect of the piston rod 33 on the through hole 11 is not good enough under the condition that the top wall of the upper cavity 1 is thin, on the basis, the cylindrical boss 13 can be vertically and downwardly protruded in the middle of the top wall in the upper cavity 1, the through hole 11 vertically penetrates through the middle of the boss 13, the diameter of the through hole 11 is slightly smaller than that of the piston rod 33, and the piston rod 33 can be made of rubber material with certain elasticity. When the hydraulic pressure of the upper infusion tube 4 is small, the upper end of the piston rod 33 is inserted into the through hole 11 in an interference manner under the elastic force of the elastic part, and the contact surface of the piston rod 33 when sealing the through hole 11 is increased, so that the sealing effect on the through hole 11 is improved.

Preferably, in order to improve the stability of the piston rod 33 when sealing the through hole 11, a conical sealing portion 331 may be disposed at the upper end of the piston rod 33, the inclined surface of the sealing portion 331 faces upward, the opening shape at the lower end of the through hole 11 is adapted to the sealing portion 331, when the hydraulic pressure of the upper infusion tube 4 is small, the piston rod 33 makes the inclined surface of the sealing portion 331 abut against the inclined surface at the lower end of the through hole 11 under the elastic force of the elastic member, so as to prevent the liquid from flowing out, and compared with the sealing in the manner of abutting against two horizontal surfaces, the piston rod 33 is more stable when sealing the through hole 11.

Preferably, in order to prevent liquid from penetrating into the upper cavity 1 through the gap between the inclined surface of the sealing portion 331 and the inclined surface of the through hole 11, a waterproof layer made of polyurethane having a certain elasticity may be laid on the inclined surface of the sealing portion 331, so that the gap between the inclined surface of the sealing portion 331 and the inclined surface of the through hole 11 may be reduced, and the polyurethane has a good waterproof property to prevent liquid from penetrating.

Example 2

Referring to fig. 2 and 3, the novel anti-reflux device for the indwelling needle provided by the embodiment comprises an upper cavity 1, a lower cavity 2 and an elastic part, wherein the bottom wall of the upper cavity 1 is communicated with the top wall of the lower cavity 2, a through hole 11 with the diameter of 1cm is formed in the top wall of the upper cavity 1, the inner part of the upper cavity 1 is communicated with an upper infusion tube 4 through the through hole 11, and one end of the upper infusion tube 4, which is far away from the upper cavity 1, is connected with an infusion bag; the lower end of the elastic part is fixedly connected with the inner bottom wall of the upper cavity 1, the upper end of the elastic part is provided with a piston rod 33 corresponding to the through hole 11, the elastic force of the elastic part is set to be 0.3N, the elastic force is equivalent to the pressure (3KPA) of 30cm water column and acts on the pressure generated on the section area (1cm3) of the through hole 11, the height of the water column in the upper infusion tube 4 is more than 30cm during infusion, at the moment, the elastic force of the elastic part on the piston rod 33 is smaller than the pressure of the liquid column, and the upper end of the piston rod 33 is separated from the lower end opening of the through hole 11 under the liquid pressure so as to open the through hole 11 for infusion; when the infusion is stopped, because the human body venous pressure is usually the pressure generated by 5-10cm water column, the water column pressure of the upper infusion tube 4 is gradually balanced to the human body venous pressure (the pressure of 5-10cm water column) which is less than the pressure of 30cm water column, at the moment, the elasticity of the elastic piece to the piston rod 33 is greater than the liquid column pressure, the piston rod 33 can be pushed to enable the end face of the upper end of the piston rod 33 to be abutted against the opening at the lower end of the through hole 11 to close the through hole 11, and venous blood backflow and air entering are prevented. The lower cavity 2 is internally communicated with a lower infusion tube 5, one end of the lower infusion tube 5, which is far away from the lower cavity 2, is connected with a needle, so that the liquid in the lower cavity 2 can be injected into the vein of a patient from the lower infusion tube 5 through the needle.

Preferably, the elastic member can be set as a pressure spring 32, two ends of the pressure spring 32 are respectively and fixedly connected to the middle part of the inner bottom wall of the upper cavity 1 and the end surface of the lower end of the piston rod 33, a fixing rod 321 is inserted into the pressure spring 32, and the lower end of the fixing rod 321 is fixedly connected to the middle part of the inner bottom wall of the upper cavity 1, so that the pressure spring 32 is prevented from being bent when the pressure spring 32 is compressed, and the pressure spring 32 is positioned.

The working process and principle of the utility model are as follows:

the height of the water column in the upper infusion tube 4 is larger than 30cm during infusion, at the moment, the elasticity of the elastic part to the piston rod 33 is smaller than the pressure of the liquid of the upper infusion tube 4 to the piston rod 33, so that the upper end face of the piston rod 33 is separated from the lower end opening of the through hole 11 to open the through hole 11, after the through hole 11 is opened, the liquid in the upper infusion tube 4 firstly flows into the upper cavity 1 through the through hole 11, then flows into the lower cavity 2 from the leakage opening 12, and finally flows into the vein of a patient through the lower infusion tube 5 and a needle connected with the lower infusion tube 5.

When the infusion is stopped, because the human body venous pressure is usually the pressure generated by 5-10cm water column, the water column pressure of the upper infusion tube 4 is gradually balanced to the human body venous pressure (the pressure of 5-10cm water column) which is less than the pressure of 30cm water column, at the moment, the elasticity of the elastic piece to the piston rod 33 is greater than the liquid column pressure, the piston rod 33 can be pushed to enable the end face of the upper end of the piston rod 33 to be abutted against the opening at the lower end of the through hole 11 to close the through hole 11, and venous blood backflow and air entering are prevented.

Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims

1. The utility model provides a novel keep somewhere needle anti-return device which characterized in that: the infusion bag comprises an upper cavity (1), a lower cavity (2) and an elastic piece, wherein the bottom wall of the upper cavity (1) is communicated with the top wall of the lower cavity (2), a through hole (11) is formed in the top wall of the upper cavity (1), the interior of the upper cavity (1) is communicated with an upper infusion tube (4) through the through hole (11), and one end, far away from the upper cavity (1), of the upper infusion tube (4) is connected with the infusion bag; the lower end of the elastic piece is fixedly connected to the inner bottom wall of the upper cavity (1), the upper end of the elastic piece is provided with a piston rod (33) corresponding to the through hole (11), and the upper end of the piston rod (33) can automatically close the through hole (11) under the elastic action of the elastic piece; the lower cavity (2) is internally communicated with a lower infusion tube (5), and one end of the lower infusion tube (5) far away from the lower cavity (2) is connected with the needle head.

2. The novel anti-reflux device for the indwelling needle according to claim 1, wherein: the elastic piece is a silica gel sleeve (31), and the silica gel sleeve (31) is made of medical silica gel materials.

3. The novel anti-reflux device for the indwelling needle according to claim 1, wherein: the elastic piece is a pressure spring (32), a fixing rod (321) is inserted into the pressure spring (32), and the lower end of the fixing rod (321) is fixedly connected to the middle of the inner bottom wall of the upper cavity (1).

4. The novel anti-reflux device for the indwelling needle according to claim 1, wherein: the novel vacuum cup is characterized in that leakage openings (12) are symmetrically formed in two sides of the bottom wall of the upper cavity (1), and the bottom wall of the upper cavity (1) is communicated with the top wall of the lower cavity (2) through the leakage openings (12).

5. The novel anti-reflux device for the indwelling needle according to claim 1, wherein: go up cavity (1) interior roof middle part protruding boss (13) of being equipped with, boss (13) are run through in through-hole (11).

6. The novel anti-reflux device for the indwelling needle according to claim 1, wherein: the upper end of the piston rod (33) is provided with a conical sealing part (331), and the opening shape of the lower end of the through hole (11) is adapted to the sealing part (331).

7. The novel anti-reflux device for the indwelling needle according to claim 6, wherein: a waterproof layer is laid on the inclined plane of the sealing part (331).