KR20170056903A

KR20170056903A - Iv catheter

Info

Publication number: KR20170056903A
Application number: KR1020150160306A
Authority: KR
Inventors: 조봉래; 박학섭; 박준민
Original assignee: (주)에이치앤비메디텍
Priority date: 2015-11-16
Filing date: 2015-11-16
Publication date: 2017-05-24

Abstract

An IV catheter of the present invention includes: a catheter hub including a catheter tube installed at the front end, and having a cup shape with a first space which has a rear side opened; a valve unit installed inside the first space, and blocking a fluid flowing along a first direction front the front end of the first space to the rear end thereof through the catheter tube; and a sliding unit installed inside the first space to be slid toward the first direction or a second direction which is an opposite direction, and opening and closing the valve unit by sliding. The valve unit can be located between the front end of the first space and the sliding unit inside the first space.

Description

IV catheter {IV CATHETER}

The present invention relates to an IV catheter that is mounted in a vein to continuously infuse liquid or drug through a blood vessel.

In patients who are unable to consume food, patients who need surgery, and patients who need to supply nutrients due to decreased function of the human body, fluid is forced to be administered to the patient's blood vessel through a medical fluid set. In the case of patients requiring blood transfusion, blood is also forcibly administered to a patient's blood vessel through a blood transfusion set.

Meanwhile, as described above, when administering nutrients or transfusions to the blood vessels of a human body through a medical fluid set or blood transfusion set, a special injection needle called an IV catheter is punctured into the patient's vein, With the needle and cannula hub removed, the connecting tip of the syringe, the fluid, and the lure tip of the transfusion set are connected to the rear end of the IV catheter.

Because the IV catheter acts as a pathway for bacteria to enter the bloodstream, it is important to keep the IV catheter and its surrounding cleanliness in order to prevent bacterial infection.

However, the IV catheter according to the conventional technique described above has a problem that blood in the vein flows back through the catheter tube due to blood pressure when the cannula needle portion and the cannula hub are removed from the catheter hub after puncturing the vein of the human body through the cannula Occurs.

When blood in the vein flows back through the catheter tube due to blood pressure, there is a problem that bacterial infection due to blood occurs.

Bacterial infections due to hemorrhagic reflux into the catheter tube not only prolong the hospital stay, but also cause hospitalization costs and mortality rates.

Korean Patent Registration No. 0843163 discloses an IV catheter in which blood reflux is prevented.

Korean Patent Registration No. 0843163

The present invention is to provide an iv catheter in which backflow of blood is prevented and which is easy to manufacture.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible.

The i-V catheter of the present invention includes: a cup-shaped catheter hub having a catheter tube at its tip and a first space with an open rear end; A valve unit installed in the first space and blocking a fluid flowing along a first direction from a tip end of the first space to a trailing end via the catheter tube; And a sliding unit slidably installed in the first space in a first direction or a second direction opposite to the first direction and opening and closing the valve unit according to the sliding, And may be disposed between the tip of the first space and the sliding unit within one space.

A first stopper extending in the first direction is provided on an outer circumferential surface of the catheter hub, a second stopper in the form of a projection inserted into the first stopper is provided on an outer circumferential surface of the sliding unit, The sliding section of the sliding unit can be determined by the second stopper.

The second stopper fitted to the first stopper is exposed to the outside, and the diameter of the outer circumferential surface of the sliding unit having the second stopper may be the same as the diameter of the first space.

At least one of the catheter hub or the sliding unit may include an elastic material such that the sliding unit is inserted into the first space along the second direction and the second stopper is fitted into the first stopper.

A stopping jaw is formed between both ends of the first stopper to partially restrict movement of the second stopper. The engaging jaw can prevent the second stopper from being moved from the current position to another position by a force smaller than the set value.

The i-V catheter of the present invention may include an auxiliary unit installed downstream of the sliding unit in the first direction in the first space.

The sliding unit may be provided with a crystal portion protruding in the second direction and having a hollow.

The auxiliary unit may include a cup-shaped auxiliary portion having a third space with a rear end opened, an insertion portion having a hollow protruding in the second direction from the tip of the auxiliary portion, a fastening portion formed on the auxiliary portion, .

The latching portion may restrict movement of the auxiliary portion, which is input in the second direction, beyond the set position.

The insertion portion may have a diameter inserted into the hollow portion of the crystal portion and a length protruding from the end portion of the crystal portion at the setting position.

And the insertion portion can maintain the state in which the fluid passage is opened by tilting the valve unit at the setting position.

A cannula hub may be inserted into the auxiliary portion.

When the cannula hub is inserted into the auxiliary portion, a cannula needle portion connected to the tip of the cannula hub can be inserted into the hollow of the insertion portion and inserted into the catheter tube through the hollow portion of the insertion portion.

The fastening portion may be engaged with a protrusion or groove formed on the outer surface of the cannula hub when the cannula hub is inserted into the auxiliary portion.

When the catheter hub is moved in the first direction, the anchoring unit can move with the catheter hub in the first direction.

The i-V catheter of the present invention may include a valve unit for preventing backflow of blood, and a sliding unit for forcibly pushing the valve unit when the connection tip of the medical instrument is inserted.

Therefore, it is possible to prevent the blood from flowing from the vein toward the i-V catheter, and the fluid flowing by its own weight can be easily input into the vein without being clogged by the valve unit.

In addition, according to the i-V catheter of the present invention, the manufacture can be completed by sequentially inserting the valve unit, the sliding unit, the ancillary unit, and the cannula hub into the catheter hub having the catheter tube in the same direction.

Therefore, it is possible to simplify the configuration and control of the automated apparatus used for the automatic production of the IV catheter. As a result, the backflow of blood is prevented, and an eye catheter having smooth input of liquid and the like can be rapidly and mass-produced, and can be provided at low cost to the user.

1 is a perspective view showing an i-V catheter of the present invention.
2 is an exploded perspective view showing the i-V catheter of the present invention.
3 is a rear perspective view showing a catheter hub and a valve unit constituting the i-V catheter of the present invention.
4 is a schematic view showing a part of the outer circumferential surface of the catheter hub;
Figure 5 is a cross-sectional view of the sliding unit located in the second position.
6 is a cross-sectional view of the sliding unit located at the first position.
7 is a schematic view showing an auxiliary unit constituting an i-V catheter of the present invention.
8 to 12 are schematic views showing a process of assembling the eye catheter of the present invention.
Figure 13 is a schematic view of another iV catheter of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

Fig. 1 is a perspective view showing an i-V catheter of the present invention, and Fig. 2 is an exploded perspective view showing an i-V catheter of the present invention.

The iV catheter of the present invention may include a catheter hub 100, a valve unit 200, and a sliding unit 300.

The catheter hub 100 may be provided with a catheter tube 110 at its distal end and may have a first space 190 with a rear end open. The catheter hub 100 may be in the form of a generally hollow cup.

The catheter tube 110 may be a hollow tube which is inserted into a blood vessel. The catheter tube 110 may include a flexible material so as not to damage the blood vessel after being placed in the blood vessel.

Due to its flexible nature, it may be difficult for catheter tube 110 to be stuck in blood vessels alone.

The cannula needle portion 510 can be used to insert the catheter tube 110 into the blood vessel.

The cannula needle portion 510 may correspond to a needle inserted through the hollow of the catheter tube 110. When the cannula needle portion 510 is pierced into the blood vessel, the catheter tube 110 surrounding the cannula needle portion 510 may also be inserted into the blood vessel. Thereafter, when the cannula needle portion 510 is removed from the catheter tube 110, only the catheter tube 110 is inserted into the blood vessel.

The cannula needle portion 510 may be connected to the cannula hub 500 to ensure that it is correctly inserted into the blood vessel. When the cannula needle portion 510 is inserted into the blood vessel, the blood can be returned to the cannula hub 500 through the cannula needle portion 510 by the blood pressure.

The cannula hub 500 may include a transparent material to observe the blood contained therein. When the blood is filled in the cannula hub 500, it can be understood that the catheter tube is correctly inserted into the blood vessel. Since the cannula hub 500 is removed together with the cannula needle portion 510 after insertion of the catheter tube 110, it is difficult for various kinds of contamination accidents to occur due to the blood flow back to the cannula hub 500.

When the cannula needle portion 510 and the cannula hub 500 are removed, blood can flow back through the catheter tube 110 in earnest. Blood backwashing through the catheter tube 110 may make it difficult to connect a medical device, such as a fluid set, to the catheter tube 110, and may cause bacterial infection or the like.

The valve unit 200 may be used to block blood that is flowing back through the catheter tube 110 to the catheter hub 100.

The valve unit 200 may be installed in the first space 190 corresponding to the inner space of the catheter hub 100. The valve unit 200 can block the fluid flowing along the first direction 1 from the tip end of the first space 190 to the trailing end via the catheter tube 110. At this time, the fluid flowing along the first direction 1 may include blood that has flowed back from the blood vessel.

The valve unit 200 may include a one-way valve for shutting off the fluid flowing in the first direction 1 and passing the fluid flowing in the second direction 2 opposite to the first direction 1.

The valve unit 200 may be formed as a duck bill or a flute type, or may be formed in various shapes such as a plate shape.

The passage of the fluid flowing along the second direction 2 of the valve unit 200 corresponds to a case where a pressure equal to or higher than a set value is applied in the second direction 2. For example, when fluid flows through the syringe in the second direction 2, the valve unit 200 can be opened by the pressure provided from the syringe. However, in the case of a fluid which flows slightly due to its own weight as in the case of the ring gel, even if it flows in the second direction 2, the force for opening the valve unit 200 tends to be insufficient.

Therefore, a means for forcibly lifting the valve unit 200 to open the flow path of the fluid is required so that an external fluid such as a liquid solution can reliably flow into the blood vessel.

The sliding unit 300 can be used as a means for forcibly opening the flow path. However, if the sliding unit 300 maintains the state in which the valve unit 200 is tilted, the first function of preventing backflow of blood may be discolored. Accordingly, the sliding unit 300 can be configured to open or close the flow path of the fluid depending on the situation.

The sliding unit 300 can be slidably installed in the first space 190 in the first direction 1 or in the second direction 2 opposite to the first direction 1. The sliding unit 300 installed in the first space 190 can open and close the valve unit 200 according to the sliding direction or the sliding position.

For example, the valve unit 200 can maintain the state of closing the fluid passage by the elastic force.

When the sliding unit 300 slides in the second direction (2), the valve unit 200 may be rotated to open the fluid passage. Conversely, when the sliding unit 300 slides in the first direction 1, the sliding unit 300 is separated from the valve unit 200, and the valve unit 200 can close the flow path by its own elastic force.

Therefore, when the sliding unit 300 is slid in the first direction &thetas; and the liquid is injected into the blood vessel in a situation where the blood of the blood vessel can be backflowed, the sliding unit 300 is slid in the second direction & The backflow of blood is prevented, and an IV catheter free from infusion of fluid can be completed.

The structure of the IV catheter can be complicated by the valve, the unit, the sliding unit 300 and the additional configuration. Due to the complex structure, the manufacturing cost of the IV catheter may be increased and the user may be burdened.

If the member constituting the ionic determiner is in a defined state, the material cost of the member can be fixed. Accordingly, it is possible to consider a method of minimizing the manufacturing cost of the IV catheter by using mass production through speeding up the manufacturing process, and cost reduction of the manufacturing facility by simplifying the manufacturing facility.

The speeding up of the manufacturing process and the simplification of the manufacturing facility can be achieved by providing an easy-to-assemble IV catheter.

In one example, according to the present invention, assembly of the IV catheter may be completed by inserting all other members relative to the catheter hub 100 into the first space 190 of the catheter hub 100 in a set order . At this time, the insertion direction of each member may be the second direction 2.

For example, the valve unit 200 may be disposed in the first space 190 between the tip of the first space 190 and the sliding unit 300. Accordingly, the valve unit 200 may be first inserted into the first space 190, and then the sliding unit 300 may be inserted.

The iV catheter of the present invention may include an auxiliary unit 400 and a cannula hub 500 in addition to the valve unit 200 and the sliding unit 300.

The auxiliary unit 400 is a member installed in the first space 190 and can open the valve unit 200 to allow the cannula needle portion 510 to be inserted into the body to pass therethrough. The cannula needle portion 510, which is input into the first space 190, may pass through a passage opened and closed by the valve unit 200. Accordingly, if the flow path is closed by the valve unit 200, the cannula needle portion 510 can pass through the valve unit 200.

When the cannula needle portion 510 is pierced, it is apparent that the valve unit 200 is damaged. In addition, particles of the valve unit 200, which are separated from the valve unit 200 by the piercing, can be inserted into the blood vessel together with the cannula needle portion 510. Particles inserted into the blood vessels can not be discharged to the outside, but they can float in the blood vessels and cause various diseases.

The auxiliary unit 400 is configured to open the valve unit 200 before the cannula needle portion 510 passes through the valve unit 200 so that the phenomenon of the penetration of the cannula needle portion 510 through the valve unit 200 is prevented .

The auxiliary unit 400 can maintain the open state of the valve unit 200 until the cannula hub having the cannula needle portion 510 is detached from the catheter hub 100 along the first direction 1. When the cannula hub 500 is disengaged from the catheter hub 100, the ancillary unit 400 may also be withdrawn from the valve unit 200. When the auxiliary unit 400 is removed, the valve unit 200 is restored by the self-elastic force to close the flow path, and the opening of the valve unit 200 can be determined by the sliding of the sliding unit 300.

The cannula needle portion 510 may be removed from the catheter hub 100 after it has been inserted into the vessel with the catheter tube 110. The IV catheter may be packaged with the cannula needle portion 510 installed, and it may take a long time until the package is torn and used.

The valve unit 200 can be kept open by the auxiliary unit 400 in a state in which the IV catheter is packaged. Therefore, the elastic force of the valve unit 200 can be damaged by long-term storage.

The valve unit 200 having the elastic force damaged may not be able to completely shut off the flow path due to the lack of restoring force even if the auxiliary unit 400 escapes at the time of use. Therefore, the phenomenon that the blood of the blood vessel flows backward may not be surely prevented.

The auxiliary unit 400 can slightly tilt the valve unit 200 to such an extent that the cannula needle portion 510 is deflected in order to minimize damage of the elastic restoring force of the valve unit 200. [

The cannula hub 500 is a member installed in the first space 190, and the cannula needle portion 510 may be provided at the tip.

The cannula needle portion 510 can be pushed into the body with the catheter tube 110 while being fitted into the catheter tube 110.

The catheter hub 100 forming the first space 190 may be integrally formed for ease of assembly. This is because, when the catheter hub 100 is completed by assembling a plurality of members, the process of forming the catheter hub 100 can become long and complicated.

The iV catheter can be completed by sequentially inserting the valve unit 200, the sliding unit 300, the auxiliary unit 400 and the cannula hub 500 into the first space 190 along the second direction 2. The valve unit 200 and the like are inserted into the first space 190 along the second direction 2 for convenience of explanation. The inserted state is a concept in which the catheter hub 100 and other members move relative to each other such that the other member such as the valve unit 200 is fixed and the catheter hub 100 moves in the first direction 1 .

3 is a rear perspective view showing a catheter hub 100 and a valve unit 200 constituting the i-V catheter of the present invention.

The first space 190 formed in the catheter hub 100 can be divided into a channel space 191 on the distal end side and a sliding space 193 on the rear end side. At this time, the flow path space 191 and the sliding space 193 may not be disconnected from each other but may be connected to each other and communicate with each other.

The diameter L1 of the flow path space 191 may be smaller than the diameter of the sliding space 193 L2.

The connection surface 109 connecting the flow path space 191 and the sliding space 193 may be formed in the catheter hub 100 due to the difference in diameter between the flow path space 191 and the sliding space 193.

The connection surface 109 corresponding to a part of the inner surface of the catheter hub 100 may be faced to the rear end of the first space 190. [ In other words, the connecting surface 109 may be a surface that is not covered and visible when the catheter hub 100 is viewed from the rear end of the first space 190.

The connection surface 109 may be provided with a mounting portion 130 on which the valve unit 200 is installed. The valve unit 200 may be installed in the installation part 130 while being inserted into the first space 190 along the second direction 2.

The mounting portion 130 can have a special structure so that the valve unit 200 is mounted by moving in the second direction 2.

The mounting portion 130 may be formed such that at least a part of the connecting surface 109 is recessed along the second direction 2.

The valve unit 200 may include an elastic material and may be formed to be fit to the mounting portion 130. When the valve unit 200 is inserted into the fitting part 130 by tight fitting, the valve unit 200 is hardly detached along the first direction 1 and the fitting part 130 of the fitting part 130 and the valve unit 200 It is difficult for the blood to leak through the gap between the electrodes.

An insertion groove 139 may be provided in the middle of the surface facing the rear end of the first space 190 in the mounting part 130 to more reliably prevent the departure of the valve unit 200 and blood leakage.

The valve unit 200 is provided with a plate-like plate portion 210 inserted into the mounting portion 130 and a protrusion 250 protruding along the second direction 2 from the plate portion 210 and inserted into the insertion groove 139 .

If the plate portion 210 is constrained to the mounting portion 130 and the protruding portion 250 is forcedly inserted into the insertion groove 139, the deviation of the valve unit 200 and blood leakage can be reliably prevented.

The valve unit 200 may be provided with the valve unit 230 so that the fluid flowing along the first direction 1 is blocked and the fluid flowing along the second direction 2 is transmitted.

The valve portion 230 may be formed in a duck bill shape protruding from the center of the plate portion 210 along the second direction. Specifically, the valve portion 230 may be provided with a split 231 facing the one side and the other side of the tube 239 projecting along the second direction 2. Each of the splits 231 may be inclined to approach each other in the second direction (2). The end portions of the respective split portions 231 can be held in contact with each other due to the elastic force.

The outer surface of each split 231 may be inclined toward the leading end side of the first space 190 in the unfolded state.

The fluid input from the tip end side of the first space 190 presses the outer surface of the split 231 and the state in which each split 231 is broken due to the upward pressure can be further strengthened. As a result, the flow path of the fluid can be closed.

On the contrary, the fluid input from the rear end side of the first space 190 presses the inner surface of the split 231, and it is possible to open each split 231 naturally. As a result, the flow path of the fluid can be opened. If the pressure applied to the inner surface of the split 231 is insufficient, the split 231 can be maintained in a wedged state, and the sliding unit 300 can be provided.

The outer diameter of the valve portion 230 protruding in the second direction 2 may be the same as the diameter of the flow path space 191 of the catheter hub 100. The outer surface of the tube constituting the valve portion 230 is in close contact with the inner surface of the flow path space 191 so that blood can be prevented from leaking between the valve unit 200 and the mounting portion 130 have.

The protruding length of the valve portion 230 may be longer than the recessed length of the mounting portion 130. The valve portion 230 may be inserted into the mounting portion 130 before the plate portion 210 is installed in the mounting portion 130, Can be inserted into the space 191. When the valve portion 230 is inserted into the flow path 191, the plate portion 210 and the mounting portion 130 can be naturally aligned. In addition, the end portion of the valve portion 230 formed in a duck-like shape can be easily inserted into the flow path space 191 even if it is fitted roughly similar to the funnel.

The sliding unit 300 may be provided with a determination unit 330 which is inserted into the valve unit 230 along the second direction 2 to widen the valve unit 230 having the duck spout shape.

Since the determination part 330 is inserted into the valve part 230, the flow path through which the fluid flows in the first space 190 can be limited to the flow path space 191. This is because the blood flowing through the flow path space 191 communicates with the inside of the sliding unit 300 through the valve unit 200 and the determination unit 330.

For convenience of assembly, the sliding space 193 may be formed to have a low degree of isolation from the outside. Accordingly, when a flow path is formed between the sliding space 193, specifically, the inner surface of the catheter hub 100 and the outer surface of the other member, blood can be drained to the outside.

However, since the determination portion 330 of the sliding unit 300 is inserted into the valve portion 230 of the valve unit 200 inserted into the flow path space 191, the inner surface of the catheter hub 100 and the outer surface of the other member The fluid does not flow.

4 is a schematic view showing a part of the outer circumferential surface of the catheter hub 100. Fig.

The first stopper 170 may be formed on the outer circumferential surface of the catheter hub 100 and extend in the first direction 1 '.

A second stopper 370 having a protrusion shape to be inserted into the first stopper 170 may be provided on the outer circumferential surface of the sliding unit 300.

The sliding section of the sliding unit 300 can be determined by the second stopper 370 fitted to the first stopper 170. [

The second stopper 370 fitted to the first stopper 170 may be exposed to the outside. The user can easily grasp the current position of the sliding unit 300 inserted into the first space 190 through the second stopper 370 exposed to the outside. In addition, when it is necessary to forcibly change the current position of the sliding unit 300, the position of the sliding unit 300 can be changed by operating the second stopper 370 exposed to the outside.

The diameter of the outer circumferential surface of the sliding unit 300 formed with the second stopper 370 may be the same as the diameter of the first space 190. According to this, although fluid such as diarrhea flows into the sliding space 193, the fluid hardly flows out to the outside through the space between the outer circumferential surface of the sliding and the inner circumferential surface of the catheter hub 100 forming the sliding space 193.

The sliding unit 300 may be inserted into the first space 190 along the second direction 2 so that the second stopper 370 may be inserted into the first stopper 170, At least one may comprise an elastic material. The elastic force of the elastic material is sufficient for the elasticity of the synthetic resin.

A stopping protrusion 171 may be formed between both ends of the first stopper 170 to restrict the movement of the second stopper 370. The stopping protrusion 171 may protrude from the inner surface of the first stopper 170 in a direction of reducing the width or depth of the first stopper 170.

For example, the latching jaw 171 may protrude in a direction perpendicular to the first direction?.

The latching jaw 171 can prevent the second stopper 370 from being moved from the current position to another position by a force smaller than the set value. For this purpose, at least one of the latching protrusion 171 and the second stopper 370 may include an elastic material.

When the setting section in which the second stopper 370 is moved is a section between the first position x1 and the second position x2, the latching jaw 171 may be provided between x1 and x2.

When the second stopper 370 is positioned at the second position x2, the determination unit 330 of the sliding unit 300 is in a state of being separated from the valve unit 230 of the valve unit 200, specifically, the split 231 . Therefore, the flow path can be closed by the valve portion 230. [

The sliding unit 300 may move along the second direction 2 by the distance between x1 and x2 and may be located at the first position x1. Due to the movement of the sliding unit 300, the determiner 330 also moves in the second direction 2 and can open the split 231. Therefore, the flow path can be opened.

The rear end of the first stopper 170 may be connected to an assembly hole 176 formed at the rear end of the outer wall of the catheter hub 100. [

The second stopper 370 can be easily introduced into the outer wall of the catheter hub 100 by the assembly hole 176 and can be guided to the first stopper 170. [ The second stopper 370 input to the first stopper 170 is prevented from being detached in the second direction 2 by the stopping protrusion 171 formed between the first stopper 170 and the assembly hole 176 .

FIG. 5 is a sectional view showing the sliding unit 300 located at the second position, and FIG. 6 is a sectional view showing the sliding unit 300 located at the first position.

The sliding unit 300 may include a sliding portion 310 formed in a cup shape having a second space 390 in which the rear end is opened.

The connection tip 10 of various medical instruments such as a syringe, which is input in the second direction 2, may be inserted into the second space 390 of the sliding part 310. At this time, the diameter L3 of the second space 390 may be equal to the diameter La of the connection tip 10.

Since the diameter L3 of the second space 390 is equal to the diameter La of the connecting tip 10, the connecting tip 10 inserted into the sliding part 310 is inserted into the second space corresponding to the inner space of the sliding part 310, (Not shown).

At the tip of the sliding part 310, a crystal part 330 protruding in the second direction 2 may be provided.

And the hollow portion 339 communicating with the second space 390 may be formed in the crystal portion 330. Accordingly, when the determination unit 330 is inserted into the valve unit 230, the fluid that has passed through the valve unit 230 can flow into the second space 390 of the sliding unit 310 through the crystal unit 330 have. Conversely, the fluid in the second space 390 may be output to the valve unit 230 via the determination unit 330.

The catheter hub 100 or the sliding unit 300 may be provided with stoppers 170 and 370 for limiting the sliding section of the sliding part 310 to the setting section D. For example, the first stopper 170 and the second stopper 370 may correspond to the stopper portions 170 and 370.

The sliding part 310 into which the connecting tip 10 is inserted can slide with the connecting tip 10 in the setting section D.

The initial position of the sliding part 310 may be the second position x2.

The user may push the connecting tip 10 into the sliding portion 310 to insert the connecting tip 10 into the sliding portion 310 located at the second position x2. By the force of the user, the connecting tip 10 can be fitted in the sliding portion 310 and can slide in the second direction (2). The engaging protrusion 171 formed on the first stopper 170 is resistant to the movement of the second stopper 370 to be slid in the second direction 2 but may be succumbed to the force of the user.

When the sliding portion 310 of the second position x2 overcomes the resistance of the engaging step 171 and is slid in the second direction 2, the moving portion 310 moves to the first position x1, and the determining portion 330 pushes the valve unit 200 The flow path of the fluid can be opened.

If the connecting tip 10 is the end of a ringer tube, the liquid solution in the ringer tube can flow through the ringer tube and the open channel through the connecting tip 10. The fluid is output to the catheter tube 110 via the crystal unit 330 and the flow path space 191 and can be introduced into the blood vessel.

The force generated by the simple shaking of the ringer tube or the like can not overcome the resistance of the latching jaw 171 so that the sliding portion 310 can be maintained in the state of being disposed at the first position x1.

In the state in which the determination unit 330 of the sliding unit 300 pushes the valve unit 230 of the valve unit 200 and the valve unit 230 is being pushed up, the gap between the outer circumferential surface of the determination unit 330 and the valve unit 230 Blood may be introduced into the sliding space 193. Since the rear end of the sliding space 193 is open, the blood introduced into the sliding space 193 can be discharged to the outside through the rear end or the first stopper 170.

The diameter of the sliding space 193 and the diameter of the sliding unit 300 may be formed to be the same as described above so that leakage of blood through the sliding space 193 is prevented. At least when the sliding unit 300 is in the first position x1, the sliding unit 300 and the catheter tube 110 may each have a diameter that is constrained or tightened together.

In addition, the diameter of the sliding space 193 and the diameter of the sliding unit 300 may be reduced toward the second direction (2). The inner circumferential surface of the catheter hub 100 forming the sliding space 193 on the side surface and the outer circumferential surface of the sliding unit 300 may be inclined in the same direction. According to the above structure, since the sliding unit 300 is tightly fitted to the inner circumferential surface of the catheter hub 100 in the second direction 2, it is possible to reliably prevent the outflow of the fluid introduced into the sliding space 193 have.

The user can pull the connection tip 10 fitted in the sliding part 310 toward the first direction 1 in order to replace the ring gel container.

When the connecting tip 10 is pulled out, the sliding portion 310 that is tightly fitted to the connecting tip 10 can also slide along the first direction 1 together with the connecting tip 10 beyond the resistance of the engaging tab 171 .

When the sliding part 310 of x1 in the first position slides in the first direction 1 and moves to the second position x2, the determination part 330 may be detached from the valve unit 200. [ The valve unit 200 in which the crystal unit 330 is removed can close the fluid passage by its own elasticity. Therefore, the phenomenon that the blood flows backward can be prevented.

The sliding part 310 is stopped in the first space 190 and the connecting part 10 is stopped in the first direction 1. When the sliding part 310 sliding in the first direction 1 together with the connection tip 10 is caught by the stopper parts 170 and 370, May be separated from the sliding portion 310 by an external force continuously applied.

When the assembly hole 176 connected to the first stopper 170 is provided, the second stopper 370 may be introduced into the assembly hole 176 beyond the rear end side engagement protrusion 171. [ The insertion state of the sliding part 310 and the connection tip 10 is likely to become loose in a process of passing through the locking step 171 between the first position and the second position. Therefore, the sliding portion 310 can be detached from the connection tip 10 and stopped at the second-side coupling end stop 171. The assembly hole 176 may extend in a direction different from the extending direction of the first stopper 170 to reliably prevent the second stopper 370 from being pulled out through the assembly hole 176. [

According to the sliding unit 300 described above, the valve unit 200 can be opened or closed appropriately according to the replacement of the connection tip 10.

The catheter hub 100 may be formed in a cup shape. At this time, the sliding unit 300 may be formed into a small cup shape inserted into the catheter hub 100. Therefore, the installation of the sliding unit 300 can be completed by inserting the sliding unit 300 into the catheter hub 100.

7 is a schematic view showing an auxiliary unit 400 constituting the i-V catheter of the present invention.

As described above, the i-V catheter of the present invention may include an auxiliary unit 400 installed on the back or the downstream side of the sliding unit 300 in the first direction (1) in the first space (190).

The auxiliary unit 400 is provided with a supplementary part 410 into which the cannula hub 500 inputted into the first space 190 along the second direction 2 is inserted and a coupling part 480 integrally formed with the auxiliary part 410 .

The auxiliary portion 410 may be formed in a cup shape having a third space 490 whose rear end is opened.

The fastening part 480 can fasten the auxiliary part 410 to the cannula hub 500 when the cannula hub 500 is inserted into the third space 490 corresponding to the internal space of the auxiliary part 410. [ When the cannula hub 500 is output in the first direction 1, the auxiliary part 410 is inserted into the first space 190 together with the cannula hub 500 by the coupling part 480, / RTI >

When the auxiliary unit 400 is detached, only the valve unit 200 and the sliding unit 300 are left in the first space 190 and an environment in which the connection tip 10 of the medical instrument can be inserted can be provided.

The auxiliary unit 400 is for preventing the cannula needle portion 510 of the cannula hub 500 inserted into the first space 190 from damaging the valve unit 200 during the manufacturing process of the i- .

The auxiliary unit 400 may be provided with an insertion part 430 for opening the valve unit 200 before the cannula needle part 510 passes through the valve unit 200 in order to prevent the valve unit 200 from being damaged .

The insertion portion 430 may protrude from the distal end of the auxiliary portion 410 in the second direction 2. The insertion portion 430 may be provided with a hollow 439 through which the cannula needle portion 510 corresponding to the injection needle passes. The insertion portion 430 may have an outer diameter that is inserted into the hollow portion 339 of the crystal portion 330 of the sliding unit 300.

The insertion portion 430, the fastening portion 480 and the fastening portion 470 may be integrally formed with the auxiliary portion 410 for convenience of manufacture.

The latching part 470 can restrict the auxiliary part 410 input in the second direction 2 from moving beyond the set position. At this time, the insertion portion 430 can maintain the state in which the fluid passage is opened by tilting the valve unit 200 at the setting position.

The auxiliary unit 400 can be inserted into the first space 190 in a state where the sliding unit 300 is located at the rear end side, that is, in a state in which the sliding unit 300 does not push the valve unit 200, have. Therefore, if the auxiliary unit 400 inserted in the second direction 2 continuously moves without stopping at the set position, the sliding unit 300 can be pushed toward the front end side. When the sliding unit 300 moves to the tip end side, the valve unit 200 is opened, so that even when the auxiliary unit 400 and the cannula hub 500 are separated from the first space 190, have. As a result, the blood of the blood vessel can flow out to the outside through the valve unit 200.

According to the latching unit 470, the auxiliary unit 400 inserted in the second direction 2 can be stopped at a setting position where the sliding unit 300 is not pushed to the first position.

The insertion portion 430 may have a length protruding from the end of the determination portion 330 of the sliding unit 300 while the auxiliary portion 410 is stopped at the setting position by the engagement portion 470. [ The inserting portion 430 protruding from the determining portion 330 pushes the valve unit 200 so as to guide the cannula needle portion 510 through the valve unit 200 without damaging the valve unit 200 .

The insertion portion 430 can maintain the state in which the fluid passage is opened by tilting the valve unit 200 at the set position until the cannula hub 500 is disengaged from the first space 190. [ The resilient force of the valve unit 200 which is elastically deformed may be deteriorated due to the state of being opened for a long period of time. The inserting portion 430 can open the valve unit 200 less than the determining portion 330 so that the phenomenon that the restoring force is reduced is minimized. In other words, the cross-sectional area of the flow path opened by the insertion portion 430 may be smaller than the cross-sectional area of the flow path opened by the determination portion 330.

When the cannula hub 500 is inserted into the auxiliary part 410, the cannula needle part 510 connected to the tip of the cannula hub 500 can be inserted into the hollow 439 of the insertion part 430. The cannula needle portion 510 may be inserted into the catheter tube 110 through the hollow 439 of the insert 430.

The fastening portion 480 may be engaged with the protrusion 580 or the groove formed in the outer surface of the cannula hub 500 when the cannula hub 500 is inserted into the auxiliary portion 410. When the cannula hub 500 moves in the first direction 1, the auxiliary unit 400 moves in the first direction 1 together with the cannula hub 500 by the fastening unit 480 and is released from the first space 190 .

The iV catheter described above can be assembled by the following process.

8 to 12 are schematic views showing a process of assembling the eye catheter of the present invention.

In this specification, the assembly process of the i-V catheter is described in which the other members are inserted in the second direction (2) in a state where the catheter hub (100) is fixed. However, the assembly process of the IV catheter may also include a process in which the catheter hub 100 and other members move relative to each other in the direction of approaching each other.

The valve unit 200 may be inserted into the first space 190 corresponding to the inner space of the catheter hub 100 in the second direction 2.

The plate portion 210 of the valve unit 200 inserted into the first space 190 may be inserted and fixed to the mounting portion 130 formed on the inner surface of the catheter hub 100. The protrusion 250 of the valve unit 200 can be forcedly inserted into the insertion groove 139 provided in the installation part 130. [

The valve portion 230 of the valve unit 200 may be inserted into the flow path space 191 inside the catheter hub 100. When the valve unit 200 is inserted into the mounting part 130, the valve part 230 protruded in the second direction 2 is first inserted into the flow path space 191, so that the plate part 210 and the protrusion part 250 are naturally It can be naturally aligned with the mounting portion 130 or the insertion groove 139.

The sliding unit 300 may be inserted into the first space 190 after the valve unit 200 is installed in the mounting unit 130. [

Since the second stopper 370 formed on the outer circumferential surface of the sliding unit 300 is restricted from moving by the first stopper 170 provided on the outer wall of the catheter hub 100, And can be located at the second position x2 that does not push.

The sliding unit 300 inserted into the first space 190 can be held at the second position x2 by the locking protrusions 171 formed on the first stopper 170 and the second stopper 370. [

After the sliding unit 300 is inserted, the auxiliary unit 400 may be inserted into the first space 190 along the second direction 2.

The auxiliary unit 400 may be input to the rear end of the sliding unit 300 already inserted into the first space 190. When the second space 390 is formed at the rear end of the sliding unit 300, the auxiliary unit 400 can be inserted into the second space 390.

The latching portion 470 of the auxiliary unit 400 may extend or extend in the outer circumferential direction and may extend beyond the outer wall of the catheter hub 100. The auxiliary unit 400 may not be able to move beyond the set position and move in the second direction 2 due to the engagement portion 470 extending over the rear end of the outer wall.

The insertion portion 430 of the auxiliary unit 400 at the setting position has a length extending beyond the determination portion 330 of the sliding unit 300 to the valve unit 200 so that the valve unit 200 is partially opened .

The fastening portion 480 of the auxiliary unit 400 may be engaged with the protrusion 580 or the groove formed on the outer surface of the cannula hub 500.

After the insertion of the auxiliary unit 400 into the first space 190 or the second space 390, the cannula hub 500 may be inserted. The cannula needle portion 510 located at the tip of the cannula hub 500 can be inserted into the insertion portion 430 through the third space 490 corresponding to the inner space of the auxiliary unit 400. [ The catheter needle portion having passed through the insertion portion 430 can be inserted into the catheter tube 110 positioned at the distal end of the catheter hub 100 without damaging the valve unit 200 partially opened by the insertion portion 430 have.

When the catheter hub 100 is inserted up to the cannula hub 500, the assembly process of the eye catheter of the present invention can be completed. The valve unit 200, the sliding unit 300, the auxiliary unit 400 and the cannula hub 500 are sequentially inserted into the first space 190 of the catheter hub 100 along the second direction 2, As shown in FIG.

Therefore, if only the assembly means for holding each member in the completed state and moving it in the second direction (2) is provided, the eye catheter of the present invention can be assembled. It is obvious that the assembling speed is increased according to the simple assembling means. As a result, high-speed mass production is possible, and manufacturing costs of the IV catheter can be greatly reduced.

Meanwhile, the IV catheter of the present invention can be used in a state where the cannula hub 500 is inserted into the catheter hub 100 as shown in FIG.

The cannula needle portion 510 inserted into the catheter tube 110 may protrude from the catheter tube 110. The cannula needle portion 510 may be pierced with the blood vessels of the body together with the catheter tube 110. At this time, only part of the catheter tube 110 can be put into the body.

Once properly inserted into the blood vessel, the blood can be input to the cannula hub 500 via the cannula needle portion 510. The user can see the blood entering the transparent cannula hub 500 and determine if the cannula needle portion 510 and the catheter tube 110 are properly installed.

If it is determined that the catheter needle 110 is normally pushed in, the user can push the catheter hub 110 forward so that the entire catheter tube 110 is pushed into the blood vessel.

During this process, the cannula hub 500 is relatively retracted and the ancillary unit 400 caught by the cannula hub 500 is also retracted by the fastening portion 480.

The inserting portion 430 of the auxiliary unit, which has partially opened the valve unit 200 due to the backward movement of the auxiliary unit 400, may be detached from the valve unit 200.

The valve unit 200 in which the insertion portion 430 is removed can close the fluid passage by its own restoring force. Therefore, even if the cannula hub 500 is disengaged from the first space 190, the blood of the blood vessel can not be plugged back into the valve unit 200.

In this state, when the cannula hub 500 is completely removed from the first space 190, the auxiliary unit 400 can be completely detached from the first space 190. When this state is viewed from the rear end side of the catheter hub 100, the rear end of the sliding unit 300 inserted into the catheter hub 100 is exposed.

Since the second space 390 in which the connection tip 10 of the medical instrument is inserted is formed at the rear end of the sliding unit 300, the user inserts the connection tip 10 of the ring gel or the syringe into the second space 390, As shown in FIG.

The connecting tip 10 inserted in the second space 390 can push the sliding unit 300 in the second direction ② while tightly fitting the sliding unit 300. [

The sliding unit 300 can be moved from the second position x2 to the leading end side of the catheter hub, specifically to the first position x1, by overcoming the resistance of the latching jaw 171 by the force applied from the connecting tip 10.

The sliding unit 300 sliding toward the distal end side of the catheter hub 100 can open the valve unit 200 through the determination unit 330. [

Accordingly, the liquid flowing in the second direction 2 through the connection tip 10 can be easily injected into the blood vessel through the valve unit 200 and the catheter tube 110.

In the future, when the medical instrument is replaced, the user can remove the connection tip 10 in the first direction 1. As a result, the connection tip 10 moves in the first direction 1, and the sliding unit 300, which is fastened to the connection tip 10, can slide in the first direction 1 as well.

When the sliding unit 300 slides in the first direction 1, the valve unit 200 is closed and blood can be prevented from flowing backward. When the connection tip 10 of the new ring gel or syringe is inserted again along the second direction 2, the sliding unit 300 can slide again in the second direction 2 to open the valve unit 200. That is, the sliding unit 300 can control the opening and closing operation of the valve unit 200 while sliding the first and second positions in a reciprocating manner in accordance with the attachment and detachment of the connecting tip 10.

Figure 13 is a schematic view of another iV catheter of the present invention.

The iV catheter disclosed in Fig. 13 may be one in which the auxiliary unit 400 is excluded.

The auxiliary unit 400 may function to guide the cannula needle portion 510 to the catheter tube 110 and to prevent the valve unit 200 from being damaged during the guiding process.

However, if the above two functions are also implemented in the sliding unit 300, the auxiliary unit 400 can be eliminated.

First, the cannula hub 500 may be tightly fitted into the second space 390 of the sliding unit 300 to satisfy the guide function of the catheter tube 110.

Since the second space 390 corresponds to the connection tip 10 of the medical device, it is preferred that the diameter of the cannula hub 500 be made equal to the connection tip 10 of the medical device.

Next, the function of the sliding unit 300 for opening and closing the valve unit 200 can be used to prevent the valve unit 200 from being damaged.

However, in the case of the sliding unit 300, the valve unit 200 can be opened more than the auxiliary unit 400. According to this, since the restoring force of the valve unit 200 may be weakened, means for preventing the restoring force from weakening may be added.

For example, the sliding unit 300 can adjust the cross-sectional area of the opened flow path in a plurality of steps.

A first position x1 on the tip end side of the first space 190, a second position x2 on the rear end side of the first space 190, and a third position x3 between the first position and the second position.

At this time, the valve unit 200 can maintain the closed state of the fluid passage by self-elasticity.

When the sliding unit 300 is slid to the second position x2, the sliding unit 300 may be detached from the valve unit 200. [ Accordingly, the valve unit 200 can close the flow path.

When the sliding unit 300 is slid to the first position x1 or the third position x3, the valve unit 200 may be tilted to open the fluid passage.

At this time, when the sliding unit 300 is located at the third position x3, the cross-sectional area of the passage may be smaller than the cross-sectional area of the passage when the sliding unit 300 is located at the first position x1. In other words, the sliding unit 300 can open the valve unit 200 slightly at the third position x3 and open the valve unit 200 at the first position x1.

The valve unit 200 may be located at the third position x2 before the cannula hub 500 is installed in the first space 190. [ Accordingly, since the cannula needle unit 510 is installed in a state in which the valve unit 200 is slightly opened, the restoring force of the valve unit 200 can be prevented from being damaged.

The first position x1, the third position x3, and the second position x2 may be distinguished from each other by the stopper portions 170 and 370.

A locking protrusion 171 may be formed between the respective positions of the first stopper 170 formed in the catheter hub 100. [

At this time, the protrusion length y2 of the second locking protrusion 171b formed between the third position x3 and the second position x2 may be smaller than the protrusion length y1 of the first locking protrusion 171a formed between the first position and the third position have. The protruding lengths of the latching jaws 171a and 171b are different from each other in order to prevent backflow of blood.

The force in the second direction 2 may be applied to the cannula hub 500 before or before the process of injecting into the blood vessel.

When an external force is transmitted by the cannula hub 500 in the second direction 2, the sliding unit 300 located at the third position x3 can slide with the cannula hub 500 to the first position x1. In this process, the valve unit 200 is fully opened. However, since the sliding unit 300 is slid to the second position x2 immediately after the catheter tube 110 is installed, the restoring force of the valve unit 200 is not large.

When the catheter tube 110 is completely installed, the sliding unit 300 can slide over the first hooking jaw 171a of the protruding length y1 to the third position x3 due to the tightness of the cannula hub 500. [ Then, it can slide again to the second position x2 beyond the second locking projection 171b.

However, the fitting state of the sliding unit 300 and the cannula hub 500 may be loosened during the process of passing over the first stopping protrusion 171a. In this state, if the second stopping protrusion 171b has a projection length y1 equal to that of the first stopping protrusion 171a, the sliding unit 300 and the cannula hub 500 are separated by the second stopping protrusion 171b . According to this, since the sliding unit 300 is located at the third position x3, backflow of blood can not be prevented.

However, according to the present embodiment, since the second latching protrusion 171b is protruded by y2 smaller than y1, the sliding unit 300 can be slid to the second position x2 without being detached from the cannula hub 500 .

It is sufficient that the protruding length y2 of the second stopping protrusion 171b satisfies only the extent that the sliding unit 300 does not deviate from the third position x3 corresponding to the initial position due to a minor impact.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10 ... connecting tip 100 ... catheter hub
109 ... connecting surface 110 ... catheter tube
130 .. installation part 139 ... insertion groove
170 ... first stopper 171 ... latching jaw
176 ... assembly hole 190 ... first space
191 ... Euro space 193 ... Sliding space
200 ... valve unit 210 ... plate
230 ... valve portion 231 ... split
239 ... pipe 250 ... protrusion
300 ... Sliding unit 310 ... Sliding part
330 ... crystal portion 339 ... hollow portion of the crystal portion
370 ... second stopper 390 ... second space
400 ... auxiliary unit 410 ... auxiliary unit
430 ... insertion portion 439 ... hollow portion of the insertion portion
470 ... engaging portion 480 ... engaging portion
490 ... third space 500 ... cannula hub
510 ... cannula needle portion 580 ... projection

Claims

A cup-shaped catheter hub having a catheter tube at its tip and a first space with an open rear end;
A valve unit installed in the first space and blocking a fluid flowing along a first direction from a tip end of the first space to a trailing end via the catheter tube;
And a sliding unit slidably installed in the first space in a first direction or a second direction opposite to the first direction and opening and closing the valve unit according to the sliding,
Wherein the valve unit is disposed between the tip of the first space and the sliding unit within the first space.

The method according to claim 1,
Wherein the valve unit maintains a state in which the flow path of the fluid is closed by an elastic force,
And the sliding unit is slidable in the second direction so that the valve unit is lifted to open the flow path.

The method according to claim 1,
An auxiliary unit installed in the first space and opening the valve unit before the cannula needle pierced into the body passes through the valve unit;
And a cannula hub installed at the first space and having the tip of the cannula needle,
The cannula needle portion being inserted into the catheter tube while being inserted into the catheter tube,
Wherein the catheter hub forming the first space is integrally formed,
Wherein the valve unit, the sliding unit, the auxiliary unit, and the cannula hub are sequentially inserted into the first space along the second direction.

The method according to claim 1,
Wherein the first space is divided into a front-end-side channel space and a rear-end-side sliding space,
The flow path space and the sliding space communicate with each other,
Wherein the diameter of the flow path space is smaller than the diameter of the sliding space,
A connection surface connecting the flow path space and the sliding space is formed in the catheter hub due to a difference in diameter between the flow path space and the sliding space,
Wherein the connecting surface is provided with a mounting portion for mounting the valve unit,
And the valve unit is installed in the mounting part while being inserted along the second direction.

5. The method of claim 4,
Wherein the mounting portion is formed such that at least a part of the connecting surface is recessed along the second direction,
An insertion groove is provided in the middle of the surface facing the rear end of the first space in the mounting portion,
Wherein the valve unit includes a plate portion or a protrusion portion,
The plate portion is inserted into the mounting portion,
And the projecting portion is projected from the plate portion along the second direction and is inserted into the insertion groove.

The method according to claim 1,
Wherein the valve unit includes a duck bill-shaped valve portion protruding along the second direction,
Wherein the valve portion forms a one-way valve that allows the fluid to flow only in the second direction.

The method according to claim 1,
Wherein the catheter hub or the sliding unit is provided with a stopper portion for limiting a sliding section of the sliding unit to a setting section.

The method according to claim 1,
Wherein the sliding unit includes a cup-shaped sliding portion having a second space with a rear end opened,
A connection tip of a medical instrument input in the second direction is inserted into the second space of the sliding portion,
Wherein the connection tip is forcedly or tightly fitted into the second space corresponding to the internal space of the sliding portion.

The method according to claim 1,
Wherein the sliding unit is formed into a cup shape having a second space with a rear end opened,
A crystal unit protruding in the second direction is provided at the tip of the sliding unit,
Wherein a hollow is formed in the crystal portion in communication with the second space,
Wherein the catheter hub or the sliding unit is provided with a stopper portion for limiting a sliding section of the sliding unit to a setting section,
The sliding unit, into which the connection tip of the medical instrument is inserted, is slid with the connection tip within the setting interval,
When the sliding unit is slid in the second direction, the determination unit pushes the valve unit to open the fluid passage,
When the sliding unit is slid in the first direction, the determination unit is removed from the valve unit,
The valve unit in which the crystal portion is disengaged closes the flow path of the fluid by its own elasticity,
Wherein the sliding unit is stopped in the first space and the connecting tip is detached from the sliding unit when the sliding unit that is slid in the first direction together with the connecting tip is caught by the stopper unit.

The method according to claim 1,
And an auxiliary unit installed downstream of the sliding unit in the first space in the first direction.

11. The method of claim 10,
Wherein the auxiliary unit is provided with a subsidiary portion into which the cannula hub input into the first space is inserted along the second direction, and a coupling portion integrally formed with the auxiliary portion,
Wherein the fastening portion fastens the auxiliary portion to the cannula hub when the cannula hub is inserted into the auxiliary portion,
Wherein the auxiliary portion is detached from the first space together with the cannula hub by the fastening portion when the cannula hub is output in the first direction.

The method according to claim 1,
When a first position on a distal end side of the first space, a second position on a rear end side of the first space, and a third position between the first position and the second position are defined,
Wherein the valve unit maintains a closed state of the fluid passage by its own elasticity,
Wherein when the sliding unit is slid to the first position or the third position, the sliding unit opens the valve unit to open the fluid passage,
Wherein the sliding unit is detached from the valve unit when the sliding unit is slid to the second position,
Sectional area of the flow passage when the sliding unit is located at the third position is smaller than the cross-sectional area of the flow passage when the sliding unit is located at the first position,
Wherein the valve unit is located in the third position before a cannula hub having a cannula needle portion inserted through the catheter tube is installed in the first space.

A catheter hub having a catheter tube at its tip;
A valve unit for blocking fluid from the distal end to the distal end of the catheter hub;
And a sliding unit for opening and closing the valve unit,
A connection tip of a medical instrument is detachably attached to the sliding unit,
Wherein the connection tip is forced or snugly fit into the internal space of the sliding unit.