CN111420168B

CN111420168B - Intravenous injection device

Info

Publication number: CN111420168B
Application number: CN202010247944.4A
Authority: CN
Inventors: 李芳芳
Original assignee: First Hospital of Shanxi Medical University
Current assignee: First Hospital of Shanxi Medical University
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2022-03-01
Anticipated expiration: 2040-04-01
Also published as: CN111420168A

Abstract

The invention discloses an intravenous injection device, which comprises an embedded needle and a joint mechanism connected with the embedded needle by a conduit, wherein the joint mechanism comprises: a housing having an upper port, the housing having a lower end from which a connection pipe is led for connection with the guide pipe; the elastic body is provided with two axial ends, the elastic body is arranged in the shell, the upper end of the elastic body is connected to the upper port of the shell, the lower end of the elastic body is positioned in the shell, a gap penetrating through the two ends of the elastic body is formed in the elastic body so as to allow a cannula of the liquid supply device to penetrate through the elastic body, and a cavity is defined between the elastic body and the shell; wherein: the shell wall of the shell is provided with a notch, an elastic membrane is packaged at the notch, and the gas in the cavity is in contact with the inner side of the elastic membrane; before the elastomer is inserted into the cannula, the pressure of the gas in the cavity is not less than one atmosphere.

Description

Intravenous injection device

Technical Field

The present invention relates to an intravenous injection device.

Background

In the case of continuous intravenous administration to a patient, intravenous devices with pre-embedded needles are preferred. Typically, the pre-buried needle is connected by a conduit to a connector mechanism for selectively plugging the outer cannula to enable replacement of the fluid to be delivered or to disable delivery of the fluid.

The connector mechanism of the prior art intravenous injection device generally comprises a cylindrical housing for protecting, a cylindrical body made of rubber material is arranged in the housing, the cylindrical body is arranged along the circumferential direction of the housing, the middle part of the cylindrical body is pre-opened with a gap, and the gap axially penetrates through the cylindrical body; and a connecting pipe is led out from the lower end of the shell and is used for being connected with a guide pipe connected to the embedded needle.

The gap is used for inserting the insertion tube of the liquid supply device, and after the insertion tube penetrates through the gap, the liquid supply device guides liquid to the pre-buried needle through the insertion tube and the connecting tube and injects the liquid into veins of a human body through the pre-buried needle.

The function of the column and the gap is as follows: the insertion tube can be allowed to pass through the gap by virtue of the elastic action of the cylindrical body, the cylindrical body has a certain coating effect on the insertion tube, and after the insertion tube is pulled out of the cylindrical body, under the elastic action, two walls of the gap are attached to prevent fluid or impurities from entering the embedded needle through the gap.

It is known that during insertion of the cannula into the cylindrical body, the latter tends to expand in a radial direction, providing space for expansion of the cylindrical body, forming a cavity between the cylindrical body and the housing. The cavities formed in the periphery of the cylindrical body in the prior art joint mechanisms are of two types:

the first cavity is: the cavity is closed and the pressure of the gas in the cavity is one atmosphere before the cannula has passed through the cylindrical body.

The second cavity is: the cavity is communicated with the outside through the vent hole.

The first air described above has the following drawbacks:

while the cannula passes through the cylindrical body, the gas in the cavity is compressed, however, although it is known that the gas has a certain compressibility, the cannula, due to its large volume, requires a large proportion of compression of the air in the cavity, resulting in a large increase in the air pressure in the cavity, which acts against the outside of the cylindrical body to limit the expansion of the cylindrical body, with the consequence that: the force with which the cannula is inserted into and through the cylinder is significantly increased, which is detrimental to the insertion operation.

The drawbacks of the second cavity are:

the second type of cavity is open to the outside, which allows the air pressure in the cavity to be always at one atmosphere, and during insertion of the cannula through the cylindrical body, the pressure in the cavity is constant, which facilitates the insertion of the cannula, however, this results in: the cannula is only covered by the elasticity of the cylindrical body, the covering strength easily causes that the cannula and the cylindrical body are not in a sealing state, and fluid (including external gas or liquid in the shell) can flow between the cylindrical body and the cannula, so that the liquid is easily infected, and the proportion of the liquid infected by bacteria is not low due to the reason in the actual use process.

Disclosure of Invention

In view of the above technical problems in the prior art, embodiments of the present invention provide an intravenous injection apparatus.

In order to solve the technical problem, the embodiment of the invention adopts the following technical scheme:

an intravenous injection device comprising an pre-embedded needle and a connector mechanism connected to the pre-embedded needle by means of a catheter, the connector mechanism comprising:

a housing having an upper port, the housing having a lower end from which a connection pipe is led for connection with the conduit;

an elastic body having two ends in an axial direction, the elastic body being disposed in a housing, an upper end of the elastic body being connected to an upper port of the housing, a lower end of the elastic body being disposed in the housing, the elastic body having a slit formed therethrough for a cannula of a liquid supply device to pass therethrough, the elastic body and the housing defining a cavity therebetween; wherein:

a notch is formed in the shell wall of the shell, an elastic diaphragm is packaged at the notch, and gas in the cavity is in contact with the inner side of the elastic diaphragm;

before the elastomer is not inserted into the cannula, the pressure of the gas in the cavity is not lower than one atmosphere.

Preferably, the resilient diaphragm is caused to yield when the gas pressure within the cavity is greater than 1.05-1.15 times atmospheric pressure.

Wherein: the yielding means that the elastic diaphragm is plastically deformed.

Preferably, the elastic body is surrounded by a bag cover, and an annular inner cavity is encapsulated between the bag cover and the elastic body.

Preferably, the radial dimension of the elastomer is greater in the regions close to the two ends than in the regions close to the middle.

Preferably, still be provided with the rubber buffer on the conch wall of casing, the rubber buffer is used for supplying the inflation needle to wear to establish and make the inflation needle to fill the gas in the cavity.

Preferably, the shell comprises an upper shell and a lower shell, and the upper shell and the lower shell are buckled and fixed by virtue of glue; wherein:

two sealing rings are arranged between the upper shell and the lower shell;

the upper shell and the elastic body enclose the cavity.

Preferably, a first protruding ring is formed at the upper end of the upper shell, and the upper end of the elastic body is buckled on the first protruding ring and is radially compressed and fixed by the locking ring.

Preferably, a second protruding ring is formed at the upper end of the lower shell, and the lower end of the elastic body is buckled on the second protruding ring and is bonded and fixed by means of glue.

Preferably, a boss is formed on the shell wall of the shell, the notch is opened on the boss, and an annular protruding part is formed on the boss; wherein:

the elastic membrane is arranged on the boss and is pressed tightly by the end cover.

Preferably, the elastic body is made of silicone rubber, and the elastic membrane is made of a rubber material.

Compared with the prior art, the intravenous injection device disclosed by the invention has the beneficial effects that:

1. the casing is provided with the notch, the elastic membrane is arranged at the notch, and the insertion tube passes through the elastic body and is simultaneously subjected to double actions of pressure generated by elastic potential energy and pressure P1 in the cavity, so that the elastic body has a larger coating effect on the insertion tube, and the sealing effect between the insertion tube and the elastic body is better.

2. The elastic body is externally provided with an inner cavity by the capsule sleeve, the gas in the inner cavity is used for transmitting the covering force which is applied to the cannula by the capsule due to deformation and the covering force which is applied to the cannula by the gas in the cavity, and the cannula is subjected to more uniform covering force in the axial direction and the circumferential direction due to the fluidity of the gas.

The summary of various implementations or examples of the technology described in this disclosure is not a comprehensive disclosure of the full scope or all features of the disclosed technology.

Drawings

In the drawings, which are not necessarily drawn to scale, like reference numerals may describe similar components in different views. Like reference numerals having letter suffixes or different letter suffixes may represent different instances of similar components. The drawings illustrate various embodiments, by way of example and not by way of limitation, and together with the description and claims, serve to explain the inventive embodiments. The same reference numbers will be used throughout the drawings to refer to the same or like parts, where appropriate. Such embodiments are illustrative, and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

Fig. 1 is a schematic view of a connection structure of an iv set according to an embodiment of the present invention.

Fig. 2 is a view of the connector mechanism of the iv set according to the embodiment of the present invention in a state where the cannula is not inserted.

Fig. 3 is a view of a state in which a hub mechanism in an intravenous device has been inserted into a cannula according to an embodiment of the present invention.

Fig. 4 is an enlarged view of a portion a of fig. 3.

Fig. 5 is an enlarged view of a portion B of fig. 3.

Reference numerals:

10-a housing; 11-an upper shell; 111-a first projecting ring; 112-a locking ring; 113-a boss; 1131 — a projection; 12-a lower housing; 121-a second projecting ring; 122-connecting tube; 13-sealing ring; 20-an elastomer; 21-a gap; 30-an elastic membrane; 31-end cap; 40-a bag sleeve; 50-rubber plug; 51-colloid; 61-a cavity; 62-lumen; 100-a joint mechanism; 200-a cannula; 300-an embedded needle; 400-catheter.

Detailed Description

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present invention clear and concise, a detailed description of known functions and known components of the invention have been omitted.

As shown in fig. 1-5, the disclosed embodiment of the invention discloses an intravenous device that includes an pre-embedded needle 300, a catheter 400, and a connector mechanism 100.

The pre-embedded needle 300 is used for penetrating into the vein of the human body, and the two ends of the catheter 400 are respectively connected to the tail part of the pre-embedded needle 300 and between the joint mechanisms 100.

The connector mechanism 100 is used for plugging the cannula 200 of the fluid supply apparatus or stopping the injection of fluid into the human body after the cannula 200 is pulled out.

The joint mechanism 100 includes: the shell 10, the elastic body 20, the elastic membrane 30, the capsule 40 and the rubber plug 50.

The casing 10 is integrally cylindrical and is of a split structure, the casing 10 comprises an upper casing 11 and a lower casing 12 which are mutually inserted, the appearance structures of the upper casing 11 and the lower casing 12 are both obtained by plastic manufacturing and injection molding, and the upper casing 11 and the lower casing 12 are provided with two sealing rings 13 in the insertion area and are bonded by colloid.

A connecting pipe 122 is led out from the lower end of the lower shell 12, and the end of the conduit 400 is sleeved on the connecting pipe 122; the upper end of the upper case 11 is formed with a first protrusion ring 111, and the upper end of the lower case 12 is formed with a second protrusion ring 121.

The elastic body 20 is made of a rubber material, the elastic body 20 has two ends in the axial direction, the upper and lower ends of the elastic body 20 are formed into a cover structure, such that the cover structure of the upper end of the elastic body 20 is buckled to the first protrusion ring 111 of the upper shell 11, and the cover structure of the lower end of the elastic body 20 is buckled to the second protrusion ring 121 of the lower shell 12, and: a locking ring 112 is sleeved on the cover structure of the upper end of the elastic body 20, and the locking ring 112 is used for pressing the upper end of the elastic body 20, so that the upper end of the elastic body 20 cannot be separated from the upper shell 11 when being pressed downwards; the cover structure at the lower end of the elastic body 20 is fixed to the second protruding ring 121 by adhesive.

As can be seen from the above description, the elastic body 20 is integrally located in the upper shell 11, and the elastic body 20 further has the following structural features: the elastic body 20 is provided with slits 21, the slits 21 penetrate through the upper and lower ends of the elastic body 20, and the radial dimension of the middle area of the elastic body 20 is smaller than the radial dimension of the two ends of the elastic body 20.

The slit 21 is used for the insertion tube 200 of the liquid supply device to pass through, and after the insertion tube 200 passes through, the liquid flowing out of the liquid supply device enters the connecting tube 122 of the lower housing 12 through the insertion tube 200, flows to the pre-embedded needle 300 through the catheter 400, and is finally injected into the venous tube of the human body.

When it is desired to stop the infusion of fluid into the body, the cannula 200 is pulled out of the resilient body 20 and the slit 21 is closed by the elastic contraction of the resilient body 20.

The elastomer 20 and the upper housing 11 define a cavity 61 therebetween, and one aspect of the cavity 61 is to allow the elastomer 20 to expand radially to allow the cannula 200 to pass through the elastomer 20.

The elastic body 20 is made of silicone material, which makes the elastic body 20 have large elasticity and not too high rigidity, so as to facilitate the insertion of the cannula 200.

The bladder 40 is made of silicone material, which makes the bladder 40 have certain elasticity, the bladder 40 is sleeved outside the elastic body 20 and is bonded outside the elastic body 20 by the glue, so that a sealed annular inner cavity 62 is defined between the elastic body 20 and the bladder 40, and the bladder 40 is sealed with the elastic body 20 under an atmospheric pressure.

When the upper housing 11 is machined, a boss 113 is machined on the wall of the upper housing 11, and a notch is formed at the boss 113 and penetrates into the cavity 61. The edge of the boss 113 is also machined with an annular protrusion 1131.

The elastic membrane 30 is made of a rubber material with a certain thickness and a certain elastic modulus, the elastic membrane 30 is attached to the boss 113 and is pressed by the end cover 31, so that the elastic membrane 30 blocks the notch under the limitation of the protrusion 1131, and the cavity 61 is closed.

A mounting hole is prepared on the wall of the upper housing 11, so that the rubber plug 50 is installed in the mounting hole and sealed by the rubber body, the rubber plug 50 functions to allow an inflation needle, for example, a needle of an injection molding machine, to penetrate through the rubber plug 50 and fill the cavity 61 with gas to adjust the pressure of the gas in the cavity 61, and after the inflation needle is filled with the gas, the rubber body 51 is used to block the needle hole.

It should be noted that: after the intravenous device described above is assembled, the cavity 61 is filled with a gas using a gas filling needle so that the gas in the cavity 61 is not below atmospheric pressure before the elastomer 20 is inserted into the cannula 200.

It should be noted that: the elastic diaphragm 30 yields when the gas pressure in the cavity 61 is greater than 1.05-1.15 times the atmospheric pressure. Thus, when the gas pressure in the cavity 61 is greater than 1.05-1.15 times the atmospheric pressure, the elastic diaphragm 30 is plastically deformed, as a result of which: the pressure in the cavity 61 does not continue to increase but is maintained at a level slightly greater than atmospheric pressure.

The insertion and extraction process of the cannula 200 is described as follows:

during the insertion of the cannula 200 into the elastic body 20, the annular inner cavity 62 is compressed to a certain extent, so that the gas pressure in the annular inner cavity 62 is slightly greater than one atmosphere, and at the same time, the radially outer bulge of the capsule 40 is generated, and at the same time, the gas pressure in the cavity 61 is increased to generate the elastic deformation of the elastic diaphragm 30, and when the gas pressure in the cavity 61 makes the elastic diaphragm 30 yield, the elastic diaphragm 30 is plastically deformed (slightly), so that the gas in the cavity 61 is maintained at a level Po + P1(Po is atmospheric pressure, and P1 is increased pressure) slightly greater than the atmospheric pressure, so that the covering force of the elastic body 20 received by the cannula 200 is provided by the elastic potential energy of the elastic body 20 on the one hand, and increased pressure P1 on the other hand, which makes the covering effect better, i.e. the sealing effect between the cannula 200 and the elastic sleeve is better, to further reduce the risk of fluid passing between the cannula 200 and the elastomeric sleeve.

Since the pressure in the cavity 61 is only greater than the atmospheric pressure by P1, i.e. by 00.5-0.15, during the insertion of the cannula 200 into the slit 21 of the resilient body 20, the pressure in the cavity 61 does not cause the resilient body 20 to obstruct the insertion of the cannula 200 to an excessive extent.

The intravenous injection device provided by the invention has the advantages that:

1. by forming the notch on the housing and disposing the elastic membrane 30 at the notch, the insertion tube 200 is subjected to the dual actions of the pressure generated by the elastic potential energy and the pressure P1 in the cavity 61 after passing through the elastic body 20, so that the elastic body 20 has a larger covering effect on the insertion tube 200, and the sealing effect between the insertion tube 200 and the elastic body 20 is better.

2. The outer surface of the elastic body 20 forms a cavity 62 by the capsule 40, and the gas in the cavity 62 is used for transmitting the coating force applied to the cannula 200 by the capsule due to deformation and the coating force applied to the cannula 200 by the gas in the cavity 61, so that the cannula 200 is subjected to more uniform coating force in the axial direction and the circumferential direction due to the fluidity of the gas.

Moreover, although exemplary embodiments have been described herein, the scope of the present invention includes any and all embodiments based on the present invention with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the above-described embodiments, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, inventive subject matter may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the invention should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.

Claims

1. An intravenous injection device comprising an embedded needle and a connector mechanism connected to the embedded needle by a catheter, the connector mechanism comprising:

before the elastomer is not inserted into the cannula, the pressure of the gas in the cavity is not lower than one atmosphere;

the elastic body is wound with a bag sleeve, and an annular inner cavity is encapsulated between the bag sleeve and the elastic body.

2. The iv set of claim 1 wherein the elastic diaphragm is caused to yield when the gas pressure within the cavity is greater than 1.05-1.15 times atmospheric pressure;

wherein: the yielding means that the elastic diaphragm is plastically deformed.

3. The iv set of claim 1 wherein the elastomer has a radial dimension proximate the ends that is greater than a radial dimension proximate the middle region.

4. The intravenous injection apparatus as set forth in claim 1, wherein a rubber plug is further disposed on the wall of the housing, and the rubber plug is used for the inflation needle to penetrate so that the inflation needle fills the cavity with the gas.

5. The iv set of claim 1, wherein the housing comprises an upper shell and a lower shell, the upper and lower shells being snap-fit and secured by a glue; wherein:

two sealing rings are arranged between the upper shell and the lower shell;

the upper shell and the elastic body enclose the cavity.

6. The iv set of claim 5, wherein the upper end of the upper housing is formed with a first protruding ring, and the upper end of the elastic body is fastened to the first protruding ring and is fixed by radial compression of the locking ring.

7. The iv set of claim 5 wherein the lower case has a second protrusion ring formed at an upper end thereof, and the elastic body has a lower end fastened to the second protrusion ring and fixed thereto by adhesive.

8. The iv set of claim 1 wherein the housing has a wall defining a boss, the notch opening into the boss, the boss defining an annular projection; wherein:

9. The iv set of claim 1 wherein the elastomer is made of silicone and the elastomeric membrane is made of a rubber material.