CN201263811Y - Positive-pressure joint for infusion without needle - Google Patents

Abstract

The utility model relates to a positive pressure joint used for needle-free infusion, which comprises a hollow shell inside, a connecting joint with a hollow lumen, a movable core with a hollow cavity, and an elastic body. The right end of the connecting joint is provided with an annular groove , connected with the shell; the movable core is set in the annular groove, the outer diameter of the end of the movable core close to the connecting joint is larger than the outer diameter of the end far away from the end, and the movable core is an arc-shaped surface from the above-mentioned end to the other end. When it is in the original position, the arc-shaped surface and The end away from the connecting joint coincides with the inner wall of the shell; the elastic body is arranged in the annular groove, one end is in contact with the connecting joint, and the other end is in contact with the end with a larger diameter of the movable core; the arc surface of the movable core has a channel communicating with the internal cavity; The right side of the end of the movable core away from the connecting joint is an inclined plane. The structural design of the utility model makes the movable core generate positive pressure during the rightward movement, and prevents the blood from backflowing and blocking the infusion tube during infusion.

Description

A positive pressure connector for needle-free infusion

technical field

The utility model relates to the field of medical equipment, in particular to a positive-pressure connector for needle-free infusion that generates positive pressure during infusion and prevents blood backflow.

Background technique

The infusion connector is a medical device. When the patient receives multiple infusions, an indwelling catheter is usually used. The indwelling catheter usually enters the blood circulation system of the human body. This infusion method allows the human body to quickly absorb the infused liquid or medicine. There are generally two ways to connect the existing indwelling catheter and the infusion device, which are the needle infusion method and the needleless infusion method. The needle infusion method requires the indwelling catheter to have an injection joint that punctures the silicone window. The needle can be inserted into the rubber pad for infusion, but in the process of multiple punctures, the sharp infusion needle tip will cut the rubber and bring out debris, pollute the liquid medicine, and cause safety hazards to patients. The needle-free infusion method has its safety due to the lack of needles, and gradually replaces the needle-free infusion method. The existing needle-free infusion method generally uses the connector of the infusion device to connect with the indwelling catheter, but when the infusion is completed, the connector of the infusion device is removed. Due to the effect of negative pressure, the blood will flow back into the indwelling catheter, and the stagnant blood will easily coagulate. Blood coagulation will cause the indwelling catheter to be blocked, and the next infusion cannot be performed again.

Utility model content

The purpose of this utility model is to provide a positive pressure connector for needle-free infusion, which will generate positive pressure during the process of removing the infusion connector after the infusion, so that the medicinal liquid will continue to flow into the indwelling catheter and prevent blood backflow, thereby avoiding blood coagulation, clogging and indwelling catheter.

In order to achieve the above object, the utility model adopts the following technical solutions:

A positive pressure joint for needle-free infusion, comprising a hollow shell inside, a connecting joint with a hollow lumen, a movable core with a hollow cavity, and an elastic body, wherein,

The right end of the connecting joint is provided with an annular groove, and the shell is connected with the right end of the connecting joint;

The movable core is set in the annular groove. The outer diameter of the end of the movable core close to the connecting joint is larger than the outer diameter of the end far away from the connecting joint. The movable core is an arc-shaped surface from the above-mentioned end to the other end. When the movable core is in its original position, the arc-shaped surface The end away from the connecting joint coincides with the inner wall of the shell;

The elastic body is arranged in the annular groove, one end is in contact with the connection joint, and the other end is in contact with the end of the movable core close to the connection joint;

There is a channel communicating with the inner cavity on the arc surface of the movable core;

The right side of the end of the movable core away from the connecting joint is an inclined plane.

Wherein, when the movable core is in the annular groove, the inner socket surface is sealed with the first seal, the outer socket is sealed with the second seal, and the end far away from the connecting joint is sealed with the outer shell with the third seal.

Wherein, an opening is left on the shell connected with the right end of the connecting joint.

Wherein, the left end of the lumen of the connection joint is connected to the indwelling catheter.

Wherein, the left end of the connection joint has a standard Luer cone, and the right end of the shell has an external thread that is screwed with the internal thread of the standard Luer joint.

Wherein, the material used for the elastic body can be stainless steel or medical elastic material.

Wherein the material used for any one of the first sealing member, the second sealing member and the third sealing member is silicone rubber or medical flexible material.

Utilizing the positive pressure connector for needle-free infusion provided by the utility model, an indwelling catheter is connected at one end, and when the other end is pushed by the infusion connector for infusion, it provides the passage of the liquid to generate positive pressure when the infusion connector is removed at the end of the infusion. At the same time, the liquid channel is closed to avoid the problem of blood backflow and blockage of the infusion tube.

Description of drawings

Fig. 1 is a structural schematic view of the utility model when the positive pressure connector for needle-free infusion is not connected to the infusion connector;

Fig. 2 is a structural schematic diagram of the positive pressure connector for needle-free infusion of the present invention after the infusion connector is connected.

In the figure: 1. Connecting joint; 1a, buckle; 1b, lumen; 2, elastic body; 3, shell; 3a, opening; 3b; inner cavity; 4, first sealing member; 5, movable core; 5a , cavity; 5b, channel; 6, second seal; 7, third seal; 8, infusion joint; 8a, first arrow; 8b, second arrow; 8c, third arrow.

Detailed ways

The positive pressure connector for needle-free infusion proposed by the utility model is described as follows in conjunction with the accompanying drawings and embodiments.

In this embodiment, the positive pressure connector used for needle-free infusion has two states: unconnected infusion connector and connected infusion connector, and the state of the movable core when the infusion connector is not connected is called in-situ.

As shown in Figure 1, the positive pressure joint for needle-free infusion in this embodiment includes a hollow shell 3 and a connecting joint 1 with a hollow lumen 1b and a hollow cavity 5a placed inside the shell. The movable core 5, the elastic body 2, the right end of the connecting joint 1 is provided with an annular groove, and the outer shell 3 is connected to the right end of the connecting joint 1. As shown in FIG. sliding in the gap; the movable core 5 is set in the annular groove, the inner cavity 5a of the movable core 5 communicates with the lumen 1b of the connecting joint 1, the movable core slides in the annular groove, and the outer diameter of the movable core 5 changes, and the movable The outer diameter of the end of the core 5 close to the connecting joint 1 is greater than the outer diameter of the end away from the connecting joint 1, and the movable core 5 forms an arc surface from the above-mentioned end close to the connecting joint 1 to the end far away from the connecting joint 1, so its outer diameter is between the two. When the movable core 5 is in the original position, the arc-shaped surface and the end away from the connecting joint 1 coincide with the inner wall of the shell 3 to ensure sealing; the elastic body 2 is arranged in the annular groove, one end is in contact with the connecting joint 1, and the other end is in contact with the movable core 5 is in contact with one end close to the connecting joint 1, and is also in the original position when the movable core 5 is in the original position, and is compressed when the movable core 5 slides along the outer wall of the connecting joint 1; the arc surface of the movable core 5 has a The channel 5b connected to the body 5a; the right side of the movable core 5 away from the end of the connecting joint 1 is an inclined surface, the purpose of setting the inclined surface is to ensure that when the movable core 5 is pushed inward, the outer part of the third outer wall inclined surface and the outer shell in the original state 3 A groove is formed at the junction of the inner wall in contact with the second outer wall and the third outer wall for liquid to enter.

In this embodiment, when the movable core 5 is set in the annular groove, the first sealing member 4 is used to seal the inner joint surface, the second sealing member 6 is used to seal the outer joint surface, and the outer joint 1 is sealed with the outer shell 3. The third seal 7 seals.

There is an opening 3a on the shell 3 connected to the right end of the connecting joint 1, and when the movable core slides to compress the air in the annular groove, the pressure is reduced.

When in use, the left end of the internal lumen 1b of the connection joint 1 is connected to the indwelling catheter, which has a standard Luer cone, and the right end of the shell 3 has an external thread that is screwed with the internal thread of the standard Luer joint. The inner wall of the cavity 5a of the movable core 5 is long cylindrical, and the outer wall of the connecting joint 1 extending into the cavity 5a is long cylindrical. The left end of the connection joint 1 is combined with the shell 3 in the form of a buckle 1a, so that the two are tightly combined without shaking. The material used for the elastic body 2 can be stainless steel or medical elastic material. The material used for any one of the first sealing member 4 , the second sealing member 6 and the third sealing member 7 is silicon rubber or medical flexible material.

The purpose of the positive pressure connector used for needle-free infusion in this embodiment is to provide a liquid channel during infusion, to generate positive pressure when the infusion connector is removed after infusion, and to seal the liquid channel at the same time.

As shown in Figure 1, the utility model is used for the situation when the positive pressure joint of the needle-free infusion is not infused. The right end of the lumen 1b communicates with the cavity 5a in the movable core 5, and the cavity 5a communicates with the channel 5b on the second outer wall. Due to the sealing effect of the first seal, the second seal, and the third seal, and the second outer wall coincides with the inner wall of the shell when it is in the original position, the liquid channel in the positive pressure joint is isolated from the outside atmosphere when the liquid is not infused. Liquid leaks.

As shown in Figure 2, when the infusion connector 8 is inserted into the housing 3 from the right side of the positive pressure connector, the movable core 5 is moved to the left to the position shown in the figure by pushing the slope at the right end of the third outer wall. When a groove is formed at the junction between the outer part of the inclined surface and the inner wall of the outer shell 3 in the original position, which is in contact with the second outer wall and the third outer wall, a groove is formed between the first outer wall and the second outer wall of the movable core 5 and the outer shell 3. The inner cavity 3b containing the liquid, at this time, the flow of the liquid is shown by the first arrow 8a, the second arrow 8b, and the third arrow 8c in the figure, that is, it flows into the cavity 5b of the movable core 5 through the channel 5b, and then flows from the cavity 5b flows into the lumen 1b inside the connector 1 .

When the infusion joint 8 is removed, the movable core 5 moves to the right under the push of the elastic body 2, and returns to the position shown in Figure 1. During this process, the inner chamber 3b containing the liquid gradually decreases until it reaches zero. Due to the existence of the first seal 4, the second seal 6 and the third seal 7, the connection joint 1 and the movable core 5, and between the movable core 5 and the shell 3 are all sealed, so the liquid contained in the inner cavity 3b It can only flow out from the channel 5b, the cavity 5a and the lumen 1b, which achieves the purpose of generating positive pressure and avoids the problem of blood backflow and blockage of the infusion tube.

The above embodiments are only used to illustrate the utility model, but not to limit the utility model. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the utility model. , so all equivalent technical solutions also belong to the category of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims (7)

1, a kind of positive pressure connector that is used for the needleless transfusion is characterized in that, comprise the shell (3) of inner hollow and have the jointing (1) of the tube chamber (1b) of hollow, slide core (5), elastomer (2) with cavity (5a) of hollow,

Jointing (1) right-hand member is provided with cannelure, and shell (3) is connected with jointing (1) right-hand member;

Slide core (5) is enclosed within the cannelure, slide core (5) near jointing (1) one end external diameter greater than away from jointing (1) one end external diameter, slide core (5) is between above-mentioned end to end being arcwall face, slide core (5) is when being in original position, described arcwall face and match away from jointing (1) one end and shell (3) inwall;

Elastomer (2) is arranged in the cannelure, and an end contacts with jointing (1), and an end and slide core (5) are near an end in contact of jointing (1);

Has the passage (5b) that is communicated with internal cavity (5a) on the arcwall face of slide core (5);

The right side away from jointing (1) one end of slide core (5) is the inclined-plane.

2, the positive pressure connector that is used for the needleless transfusion as claimed in claim 1, it is characterized in that, when slide core (5) is enclosed within the cannelure, seal with first sealing member (4) between interior socket face, seal with second sealing member (6) between outer socket face, away from sealing with the 3rd sealing member (7) between jointing (1) one end and shell (3).

3, the positive pressure connector that is used for needleless transfusion as claimed in claim 1 is characterized in that, and leaves perforate (3a) on the shell (3) that jointing (1) right-hand member is connected.

4, the positive pressure connector that is used for the needleless transfusion as claimed in claim 1 is characterized in that, the left end of the tube chamber (1b) of described jointing (1) inserts inlying catheter.

5, the positive pressure connector that is used for the needleless transfusion as claimed in claim 1 is characterized in that jointing (1) left end has a standard Luer circular cone, and described shell (3) right-hand member has the external screw thread that screws mutually with standard Luer joint female thread.

6, the positive pressure connector that is used for the needleless transfusion as claimed in claim 1 is characterized in that described elastomer (2) material therefor can be rustless steel or medical elastic material.

7, the positive pressure connector that is used for the needleless transfusion as claimed in claim 2 is characterized in that any material therefor is silicone rubber or medical flexible material in described first sealing member (4), second sealing member (6) and the 3rd sealing member (7).

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