Pressure converter and infusion connector

Abstract

The present invention provides a pressure transducer and an infusion connector. A transducer member for providing pressure conversion is provided within the pressure transducer. When the pressure transducer of the present invention is connected to an infusion set head or a syringe tip, a negative pressure is generated within the pressure transducer, sucking a thrombus in an indwelling needle connected to the device into the needle receiver of the indwelling needle or into the device, reducing the probability of the thrombus re-entering the patient's blood vessel through the indwelling needle, and later the negative pressure is released, allowing the liquid to pass through the indwelling needle normally and flow into the blood vessel of the living body. When the infusion set head or the syringe tip is removed, the pressure transducer generates a positive pressure within a predetermined time, pushing the liquid in the indwelling needle into the blood vessel, thereby avoiding the backflow of the liquid and reducing the formation of a thrombus in the indwelling needle.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and more specifically, relates to a pressure conversion device and an infusion connector.

Background Art

[0002] An indwelling needle is a conventional instrument used in medical clinical applications, which can reduce the number of repeated punctures, is easy to operate, and can relieve the pain of patients. The indwelling needle is often used to connect to a needleless connector and an infusion path. The currently recommended needleless infusion connector is a positive pressure connector. The positive pressure connector generates a certain positive pressure at the moment it is removed from the infusion path, pushes the liquid in the indwelling needle into the blood vessel, thereby preventing the backflow of the liquid and the formation of thrombus in the indwelling needle. However, when not infusing, the backflow of blood into the soft sheath of the indwelling needle cannot be completely avoided. As a result, thrombus is formed, the tube is blocked, and there is a risk that the thrombus will enter the human blood vessel together with the liquid when infusing again.

[0003] In the prior art, it is a reasonable method to aspirate blood and thrombus together using a syringe through an infusion connector communicating with the indwelling needle, then reinject physiological saline to flush the indwelling needle, and then inject liquid from the indwelling needle. Thereby, even if the thrombus in the indwelling needle is aspirated or the thrombus stays in the indwelling needle or the infusion connector, the probability that the thrombus re-enters the human blood vessel through the indwelling needle is reduced. However, the aspirated blood increases the risk of infection such as hepatitis B and AIDS for medical staff, and also increases the hospital's investment in the treatment of medical waste.

Summary of the Invention

Problems to be Solved by the Invention

[0004] To solve the above technical problems, the present invention provides a pressure conversion device and an infusion connector. The pressure conversion device is provided with a conversion member that provides pressure conversion. When the pressure conversion device of the present invention is connected to an infusion set head or syringe tip, negative pressure is generated inside the pressure conversion device, drawing the thrombus in the indwelling needle connected to the device into the needle receptacle of the indwelling needle or into the device, reducing the probability that the thrombus will re-enter the patient's blood vessels through the indwelling needle. After the negative pressure is released, the fluid passes normally through the indwelling needle and flows into the blood vessels of the body. When the infusion set head or syringe tip is removed, the pressure conversion device generates positive pressure within a predetermined time, pushing the fluid in the indwelling needle into the blood vessels, thereby preventing fluid backflow and reducing thrombus formation inside the indwelling needle. [Means for solving the problem]

[0005] This invention proposes the following specific technical solutions.

[0006] A pressure conversion device, A conversion member is provided within the pressure conversion device, and the conversion member can be switched between a natural state and a compressed state. In the natural state, the conversion member seals the cavity of the pressure conversion device. In the action of external pressure, the conversion member switches from the natural state to the compressed state, and the cavity of the pressure conversion device communicates with the fluid outside. A negative pressure is generated in the pressure conversion device within a predetermined time. When the external pressure is released, the conversion member switches from the compressed state to the natural state, and a positive pressure is generated in the pressure conversion device within a predetermined time.

[0007] When the infusion set head or syringe tip is inserted into the pressure converter, the converter is compressed by the action of the infusion set head or syringe tip, and negative pressure is generated in the pressure converter within a predetermined time, drawing the thrombus in the indwelling needle into the pressure converter. Then, the negative pressure is released, and the fluid passes smoothly through the pressure converter and enters the indwelling needle. When the infusion set head or syringe tip is removed, the converter expands due to the action of its elasticity, switching from the compressed state to the natural state, and positive pressure is generated in the pressure converter within a predetermined time, pushing the fluid in the indwelling needle into the blood vessel, thereby preventing backflow of the fluid and reducing thrombus formation in the indwelling needle.

[0008] Preferably, the conversion member includes a connector assembly, an elastic structure, a movable body, and a connecting member.

[0009] When the needle holder or extension tube of the indwelling needle is individually inserted into the outlet channel of the pressure converter, the needle holder or extension tube of the indwelling needle cannot come into contact with the moving body of the pressure converter. Therefore, there is no significant change in the pressure inside the pressure converter, and for this reason, the plastic valve and case remain sealed.

[0010] Preferably, the needle holder or extension tube of the indwelling needle comes into contact with the moving body of the pressure converter, causing the moving body to move and the plastic valve to move, but the distance the plastic valve moves is small and the plastic valve and case remain sealed.

[0011] The movable body is provided at the outlet end (outlet channel end) of the pressure converter, one end of the connecting member is near the outlet end and is directly or indirectly connected to the movable body, and the other end of the connecting member is near the inlet end (inlet channel end) and is directly or indirectly connected to the connector assembly.

[0012] When an infusion set head or syringe tip is inserted into the pressure converter, the connector assembly moves from the inlet end to the outlet end of the pressure converter as the infusion set head moves, and the moving body moves in the opposite direction (from the outlet end to the inlet end of the pressure converter) as the connecting member acts. The movement of the moving body and / or the connecting member causes the elastic structure to move, compress, or stretch. As the moving body moves from the outlet end to the inlet end, the liquid pressure in a portion of the housing of the pressure converter decreases, and when it becomes lower than the pressure in the indwelling needle, a negative pressure is generated, and as a result, the liquid moves from the indwelling needle to the pressure converter. After the negative pressure is released, the liquid passes smoothly through the pressure converter and enters the indwelling needle. When the infusion set head or syringe tip is removed, the infusion set head or syringe tip moves the connecting member, in the direction of movement from the outlet end to the inlet end. The elastic structure returns to its initial state, restoring the connecting member to its initial state and position, and moving the movable body and the connector assembly in the reverse direction (from the inflow channel to the outflow channel). The movement of the movable body from the inflow channel to the outflow channel increases the pressure in the liquid chamber in a portion of the shell, and when the pressure in that portion of the liquid chamber becomes higher than the pressure in the indwelling needle, positive pressure is generated, and as a result, the liquid moves from the pressure converter into the indwelling needle, thereby preventing blood from entering the indwelling needle the moment the infusion set head or syringe tip is removed, and preventing thrombus formation.

[0013] Preferably, the moving body is composed of one or more members, and the moving body is movable in whole or in part, and the pressure can be locally changed through deformation.

[0014] Preferably, the elastic structure has one end connected to a fixed position added within the connector assembly or the pressure converter, and the other end directly or indirectly connected to the moving body and / or connecting member, or the middle section is fixed to a fixed position added within the connector assembly or the pressure converter, and both ends are directly or indirectly connected to the moving body and the connecting member, respectively.

[0015] Preferably, the elastic structure may consist of one or more sets, and the elasticity provided by the elastic structure is the repulsive force of a spring or the recovery force generated by the compression of an elastic material, or the recovery force caused by the deformation and twisting of a lumen wall made of an inelastic material, or the elastic structure constitutes a partial or complete liquid lumen, or a lumen is formed by adding a sealing body based on the present invention, and the liquid enters the indwelling needle through the lumen.

[0016] The elastic structure provides the power for the moving body to return to its initial state and also serves to constitute a liquid flow path, preventing contact of the liquid with other devices, reducing the liquid contact surface, and avoiding infection.

[0017] Preferably, the connector assembly is movable in the same direction as the infusion set head or syringe tip moves, and the connector assembly may be a plastic valve.

[0018] Preferably, the connecting member comprises a fulcrum and a low-elasticity, flexible cord-like material and / or a rigid, elongated material that bypasses or passes through the fulcrum.

[0019] Preferably, the fulcrum is one end of a fixed point or fixed surface provided within the pressure conversion device, and also plays a role in fixing the present invention within the pressure conversion device.

[0020] Preferably, the inlet channel end of the connecting member may be connected directly or indirectly to the connector assembly of the pressure converter.

[0021] Preferably, the elasticity of the elastic structure is the repulsive force of a spring or the restoring force generated when an elastic material is compressed, or the restoring force generated by the deformation and twisting of a cavity wall made of an inelastic material. The elastic structure may form a partial or complete liquid inner cavity. Preferably, one end of the connecting member is directly or indirectly connected to the connector assembly, and the other end is directly or indirectly connected to the moving body. When the connector assembly moves, the connecting member moves to move the moving body. When the moving body moves, negative pressure or positive pressure is generated in the liquid chamber of the pressure conversion device.

[0022] Preferably, a fixing member such as a horizontal beam is provided in the pressure conversion device.

[0023] Preferably, the elastic structure is provided between the moving body and the case of the pressure conversion device or a fixed point in the case, and restores the moving body to its initial state.

[0024] Preferably, the elastic structure can divide the liquid flow path.

[0025] Preferably, an exhaust passage may be provided in the horizontal beam.

[0026] Preferably, at least two of the connector assembly, the connecting member, the moving body, and the elastic structure are integrally formed.

[0027] Preferably, a sealing surface may be added in the pressure conversion device to form a complete liquid passage, thereby avoiding contact of the liquid with other devices, reducing the contact surface of the liquid, and avoiding infection.

[0028] Preferably, the pressure conversion device housing includes a cavity, an inflow channel opening, and an outflow channel opening. The outflow channel opening may be connected to a peripheral intravenous catheter, a central venous catheter, and a three-way valve port, and the connector of the inflow channel opening may be connected to a syringe, an infusion set, a blood transfusion set and locked thereto.

[0029] Preferably, a flap is provided at the inlet channel opening of the shell. When the infusion set head is inserted into the pressure conversion device, the flap is opened under the action of the infusion set head, and when the infusion set head is removed, the flap is closed under the action of the elastic structure to close the inlet channel opening. Preferably, the conversion member includes a connector assembly, an elastic structure, and a connecting member. The shape of the elastic structure is a shape such as a spiral or a semi-circle. Due to the deformation of the elastic structure, changes in negative pressure and positive pressure occur within a part of the liquid chamber.

[0030] When the infusion set head is inserted into the pressure conversion device, one end of the connector assembly and the connecting member moves to the outflow channel end, and the moving body and the elastic structure gradually move toward the inlet channel end. As a result, the local liquid pressure changes, and when the local liquid pressure becomes lower than the pressure of the liquid in the indwelling needle, the liquid moves from the indwelling needle toward the pressure conversion device. Also, the curved portion of the elastic structure part expands and communicates with the liquid passage. When the infusion set head is inserted into the pressure conversion device and locked, the liquid passage becomes smooth, and the drug and liquid enter the indwelling needle and the blood vessel of the living body through the device of the present invention.

[0031] When the pressure conversion device is removed from the infusion set head, due to the restoring elasticity of the shape of the elastic structure of the moving body and the elastic structure, the curve of the elastic structure returns, the local liquid pressure changes, and a positive pressure is generated to restore the device of the present invention to its initial state.

[0032] The present invention further provides an infusion connector including the above pressure conversion device.

[0033] Furthermore, the case of the pressure conversion device and the case of the infusion connector are shared.

Advantages of the Invention

[0034] In this invention, without increasing the number of conventional operations, during infusion, the pressure conversion device pre-applies a predetermined negative pressure to the indwelling needle, drawing the thrombus in the soft sheath of the indwelling needle into the needle receiver of the indwelling needle and the pressure conversion device, thereby reducing the probability of the thrombus re-entering the patient's blood vessels through the indwelling needle. Furthermore, after the infusion is completed, the pressure conversion device generates positive pressure, pushing the fluid in the indwelling needle into the blood vessels, thereby preventing blood backflow and reducing thrombus formation within the indwelling needle. [Brief explanation of the drawing]

[0035] [Figure 1] This is a schematic diagram of Embodiment 1 of the present invention. [Figure 2] This is a schematic diagram of Embodiment 1 of the present invention. [Figure 3] This is a schematic diagram of Embodiment 2 of the present invention. [Figure 4] This is a schematic diagram of Embodiment 2 of the present invention. [Figure 5] This is a schematic diagram of Embodiment 3 of the present invention. [Figure 6] This is a schematic diagram of Embodiment 3 of the present invention. [Figure 7] This is a schematic diagram of Embodiment 4 of the present invention. [Figure 8] This is a schematic diagram of Embodiment 4 of the present invention. [Modes for carrying out the invention]

[0036] The following technical descriptions of embodiments of the present invention will be clearly and completely explained with reference to the accompanying drawings of embodiments of the present invention, but it is clear that the embodiments described are only a part of the embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in these drawings may be arranged and designed in various different configurations. Therefore, the following detailed description of embodiments of the present invention shown in the accompanying drawings is not intended to limit the claimed scope of the present invention, but merely to illustrate selected embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort based on embodiments of the present invention fall within the scope of protection of the present invention.

[0037] Furthermore, similar symbols and letters indicate the same items in the following drawings; therefore, if an item is defined in one drawing, it is not necessary to further define or explain it in subsequent drawings. Also, in the description of this invention, terms such as "first," "second," etc., are used solely to distinguish between explanations and should not be understood as indicating or implying relative importance. [Examples]

[0038] Example 1 As shown in Figure 1, the pressure conversion device of the present invention includes a housing 2, an inlet channel opening 3, and an outlet channel opening 4. The connector 4 of the outlet channel opening may be optionally connected to a port such as an indwelling needle and a three-way valve in a peripheral vein, central vein, etc., and the connector of the inlet channel opening 3 may be connected to and locked to a syringe, infusion set, blood transfusion set, etc.

[0039] In the apparatus housing 2 of the present invention, when no connecting members are connected, the inside of the shell is sealed, and the cavity maintains a sterile state.

[0040] The conversion member 1 of the present invention includes a plastic valve 5, an elastic structure 1-3, a movable body 1-2, and a connecting member 1-1.

[0041] To allow the liquid to flow smoothly into the pressure converter, the top of the plastic valve 5 is provided with a convex or concave point. The plastic valve 5 is connected to a connecting member 1-1, which bypasses a relative fixed point 1-4 and is connected to a movable body 1-2. The movable body 1-2 is located near the outlet channel of the pressure converter, and its shape matches a portion of the housing of the outlet channel, thereby sealing the outlet channel.

[0042] Within the pressure conversion device, there are fixed points (horizontal beams 6) that serve to secure the device of the present invention within the pressure conversion device.

[0043] Another elastic member 1-3-2 may be present between the plastic valve 5 and the transverse beam 6, thereby returning the plastic valve 5 to its initial state. An elastic member 1-3-1 is present between the movable body 1-2 and the transverse beam 6, with one end of the elastic member 1-3-1 connected to the transverse beam 6 and the other end connected to the movable body 1-2.

[0044] Elastic members 1-3-1 and 1-3-2 serve to partition the liquid flow path and also form the housing of the device and the first chamber 7.

[0045] The movable body 1-2 and the outlet channel opening 4 of the pressure converter constitute the anode end outlet channel 8, which includes the pressure converter of the present invention. Because the shape of the movable body 1-2 matches the local housing of the outlet channel, the anode end outlet channel 8 does not need to communicate directly with the first chamber 7. When the movable body 1-2 moves upward, the shape of the movable body 1-2 no longer matches the housing of the outlet channel, and the anode outlet channel communicates with the first chamber.

[0046] As shown in Figure 2, when the infusion set head 9 is inserted into the pressure converter including the present invention, the infusion set head 9 moves the plastic valve 5 to the outlet channel of the pressure converter, and the liquid flows into the first chamber 7 using the convex or concave point on the top of the plastic valve 5. The movement of the plastic valve 5 causes the connecting member to move, and through the connecting member, moves the movable body 1-2 toward the inflow channel of the pressure converter. Also, the elastic structures 1-3-1 and 1-3-2 are compressed. As the movable body 1-2 moves, the local liquid pressure in the anode end outlet channel 8 decreases, and when the pressure becomes lower than the pressure inside the indwelling needle, a negative pressure is generated. At this time, the liquid flows in the reverse direction from inside the indwelling needle to the pressure converter. When the movable body 1-2 stops moving, the first chamber 7 communicates with the anode end outlet channel 8, at which point a complete liquid passage is obtained, and the liquid can be smoothly transported into the indwelling needle.

[0047] As shown in Figure 1, when the infusion of liquid is finished, the lock between the infusion set head 9 and the pressure converter is released. When the infusion set head 9 is removed from the pressure converter, the infusion set head 9 moves the plastic valve 5 toward the inflow channel, the plastic valve 5 moves the connecting member 1-1, and the movable body 1-2 moves from the inflow channel toward the outflow channel. Also, the compressed elastic structures 1-3-1 and 1-3-2 return to their initial state, generating elasticity, which facilitates the recovery of the plastic valve 5 to its initial state and the movement of the movable body 1-2 toward the anode end 8 of the connector of the present invention. As the movable body 1-2 moves, the pressure of the liquid in the anode end outflow channel 8 increases, and when the pressure becomes higher than the pressure in the indwelling needle, positive pressure is generated. At this time, the liquid flows from the device of the present invention toward the indwelling needle. When the movable body 1-2 stops moving, the movable body 1-2 obstructs communication between the first chamber 7 and the anode end outflow channel 8, and the pressure converter returns to its natural state and exhibits a sealed state. [Examples]

[0048] Example 2 Figures 3 and 4 show different embodiments of the present invention.

[0049] The following points differ from Example 1.

[0050] A flap 10 is provided at the inflow channel opening of the shell. When the infusion set head 9 is inserted into the pressure converter, the flap 10 opens in response to the action of the infusion set head. When the infusion set head 9 is removed, the flap 10 closes in response to the action of the elastic structure, closing the inflow channel opening. The connector assembly 5 is a conduit structure through which liquid can flow.

[0051] A movable body 1-2 is provided at the outlet channel opening of the shell, and a cell exists in the movable body 1-2. When the infusion set head 9 is inserted into the pressure converter, the movable body 1-2 moves from the outlet channel to the inflow channel, generating negative pressure, the cell of the movable body 1-2 communicates with the liquid passage, and the outlet channel opening opens. When the infusion set head 9 is removed, the movable body 1-2 moves from the inflow channel to the outlet channel, generating positive pressure, and the movement of the movable body 1-2 closes the outlet channel opening. A sealing membrane 11 exists between the connector assembly 5 and the case, and between the movable body 1-2 and the case, thereby preventing contact between the liquid and other parts of the present invention and preventing infection. [Examples]

[0052] Example 3 Figures 5 and 6 show another embodiment of the present invention.

[0053] The following points differ from those of Example 2.

[0054] The movable body 1-2 provided at the outlet channel opening of the shell is composed of one or more opening / closing members. One end of the movable body is connected to the shell 2, and the other end is connected to the transverse beam 6. An elastic structure 1-3-1 is provided below the opening / closing members, and an elastic structure 1-3-2 is provided between the transverse beam and the plastic valve 5, thereby forming a sealed liquid passage. A sealing membrane 11 exists between the movable body 1-2 and the transverse beam 6, thereby forming a liquid passage. [Examples]

[0055] Example 4 Figures 7 and 8 show another embodiment of the present invention.

[0056] The following points differ from Example 3 (see Figures 7 and 8).

[0057] The connecting members, moving parts, and elastic structures are designed as a single unit and are named connecting conversion parts 1-5, moving parts, and elastic structure parts 1-6, respectively.

[0058] The elastic structural parts 1-6 function as moving bodies, thereby changing the local pressure of the liquid. They also serve to close the liquid lumen, thereby preventing contact between the liquid and other devices of the present invention, ensuring sterility, and maintaining conditions such as drug mixing.

[0059] When the infusion set head 9 is inserted into the pressure converter, one end of the connector assembly 5 and the connection conversion part 1-5 moves to the outflow channel end, thereby causing the moving body and elastic structure part 1-6 to gradually move toward the inflow channel end, thereby changing the local fluid pressure. When the local fluid pressure becomes lower than the fluid pressure in the indwelling needle, the fluid moves from the indwelling needle toward the pressure converter. Additionally, the curved portion of the elastic structure part unfolds and communicates with the fluid passage, and once the infusion set head 9 is inserted into the pressure converter and locked, the fluid passage becomes smooth, allowing drugs or fluids to enter the indwelling needle or the blood vessels of the body through the device of the present invention.

[0060] When the pressure converter is removed from the infusion set head 9, the elasticity of the movable body and the elastic structure of the elastic structure parts 1-6 causes the curve of the elastic structure to return to its original state, changing the local fluid pressure, generating positive pressure, and restoring the device of the present invention to its initial state.

[0061] Preferably, the apparatus of the present invention functions as a connector for a moving body in a tension or compression process, and the angle 12 of the connector itself is constant (see Figures 7 and 8). Furthermore, all connection / connection relationships described herein mean that a single member does not directly connect, and that a better connecting structure can be constructed by adding or removing connecting auxiliary components depending on the specific implementation. Each technical feature in the creation of the present invention can be combined with one another, as long as they do not conflict with each other.

[0062] Those skilled in the art may make changes and modifications to the above embodiments based on the disclosure and description in the specification. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and several equivalent modifications and changes to the present invention should also be included within the scope of the claims of the present invention. Furthermore, certain terms are used in this specification, but these terms are for illustrative purposes only and do not limit the present invention.

[0063] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and do not limit it, and that any modifications, equivalent substitutions, improvements, etc., made in the spirit and principles of the present invention should be included within the scope of protection of the present invention. [Explanation of symbols]

[0064] 1 Conversion Member 1-1 Connecting Member 1-1-1 Inlet channel end of connecting member 1-1-2 Outlet channel end of connecting member 1-2 Mobile Unit 1-3 Elastic structure 1-4 Relative fixed points 2 Housing 3. Inflow channel opening 4. Outflow channel opening 5 Plastic valves 6. Transverse beam 7 Room 1 8. Anode End Outlet Channel 9 Infusion Set Heads 10 flaps 11. Sealed membrane 12. Angle between connected objects

Claims

1. A pressure converter applied inside an infusion connector, A conversion member is provided within the pressure conversion device, and the conversion member can be switched between a natural state and a compressed state. In the natural state, the conversion member seals the cavity of the pressure conversion device. In the action of external pressure, the conversion member switches from the natural state to the compressed state, and the cavity of the pressure conversion device communicates with the outside fluid. Within the pressure conversion device, negative pressure is generated within a predetermined time. When the external pressure is released, the conversion member switches from the compressed state to the natural state, and positive pressure is generated within the pressure conversion device within a predetermined time. The pressure converter comprises a connector assembly, an elastic structure, a movable body, and a connecting member, wherein the movable body is provided at the outlet end of the pressure converter, one end of the connecting member is near the outlet end and directly or indirectly connected to the movable body, and the other end of the connecting member is near the inlet end of the pressure converter and directly or indirectly connected to the connector assembly.

2. The pressure conversion device according to claim 1, characterized in that the connecting member includes a fulcrum and a flexible cord-like object and / or a rigid elongated object that bypasses or passes through the fulcrum.

3. The pressure converter according to claim 2, characterized in that the fulcrum is a point near the inlet end of the pressure converter, a side, or one or more points on a side.

4. The pressure converter according to claim 1, characterized in that the elastic structure has one end connected to a fixed position added within the connector assembly or the pressure converter, and the other end connected directly or indirectly to the movable body and / or connecting member, or the intermediate portion is fixed to a fixed position added within the connector assembly or the pressure converter, and both ends are connected directly or indirectly to the movable body and the connecting member, respectively.

5. The pressure conversion device according to claim 1, characterized in that the movable body is composed of one or more members, the movable body is movable in whole or in part, and the pressure can be locally changed through deformation.

6. The pressure conversion device according to claim 1, characterized in that a fixing member is provided inside the housing of the pressure conversion device.

7. The elastic structure may consist of one or more sets, and the elasticity provided by the elastic structure is the repulsive force of a spring or the recovery force generated by the compression of an elastic material, or the recovery force caused by the deformation and twisting of a lumen wall made of an inelastic material, or the elastic structure constitutes a partial or complete liquid lumen, or a lumen is formed by adding a sealing body, and the liquid enters the indwelling needle through the lumen, as described in claim 4.

8. The pressure conversion device according to claim 1, characterized in that the connector assembly is a plastic valve.

9. The pressure conversion device according to claim 1, characterized in that at least two of the connector assembly, the connecting member, the moving body, and the elastic structure are integrally molded.

10. The pressure conversion device according to claim 1, wherein the conversion member includes a plastic valve, an elastic structure, and a connecting member, the shape of the elastic structure is helical or semicircular, and the deformation of the elastic structure causes a change between negative and positive pressure in a part of the liquid chamber.

11. Infusion connector, An infusion connector characterized by including a pressure conversion device according to any one of claims 1 to 10.

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