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 relates to the technical field of medical equipment, and more particularly to a pressure transducer and an infusion connector. [Background technology]

[0002] Indwelling needles are conventional instruments used in medical clinical applications, which can reduce the number of repeated punctures, be easy to operate, and reduce the pain of patients. Indwelling needles are often used to connect to needleless connectors and infusion paths. The currently recommended needleless infusion connector is a positive pressure connector. The positive pressure connector generates a certain positive pressure the moment it is removed from the infusion path, pushing the liquid in the indwelling needle into the blood vessel, thereby preventing the backflow of the liquid and the formation of a blood clot in the indwelling needle. However, if infusion is not performed, the backflow of blood into the soft sheath of the indwelling needle can be completely avoided, resulting in the formation of a blood clot and blocking the tube, and there is a risk that the blood clot will enter the blood vessel of the human body together with the liquid when infusion is performed again.

[0003] In the prior art, it is a reasonable method to use a syringe to aspirate blood and clots together through an infusion connector connected to an indwelling needle, then reinject saline to flush the indwelling needle, and then inject liquid from the indwelling needle. This reduces the probability that the clot will re-enter the human blood vessels through the indwelling needle even if the clot is aspirated or retained in the indwelling needle or in the infusion connector, but the aspirated blood increases the risk of infection of medical staff with hepatitis B, AIDS, etc., and hospitals are also increasing their investment in medical waste disposal. Summary of the Invention [Problem to be solved by the invention]

[0004] In order to solve the above technical problems, the present invention provides a pressure transducer and an infusion connector. A transducer member for providing pressure conversion is provided in 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 in 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 and the liquid passes through the indwelling needle normally and flows 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. [Means for solving the problem]

[0005] The present invention proposes the following specific technical solutions.

[0006] A pressure transducer comprising: A conversion member is provided within the pressure conversion device, and the conversion member is switchable between a natural state and a compressed state. In the natural state, the conversion member seals the cavity of the pressure conversion device, and under 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 is connected to an external fluid, and negative pressure is generated in the pressure conversion device within a predetermined time, and when the external pressure is released, the conversion member switches from the compressed state to the natural state, and positive pressure is generated in the pressure conversion device within a predetermined time.

[0007] When an infusion set head or a syringe tip is inserted into the pressure converter, the converter is compressed by the action of the infusion set head or the syringe tip, and a negative pressure is generated in the pressure converter within a predetermined time, so that the thrombus in the indwelling needle is sucked into the pressure converter, and then the negative pressure is released and the liquid smoothly passes through the pressure converter and enters the indwelling needle. When the infusion set head or the syringe tip is removed, the converter expands under the action of elasticity and switches from the compressed state to the natural state, and a positive pressure is generated in the pressure converter within a predetermined time, so that the liquid in the indwelling needle is pushed into the blood vessel, thereby preventing the backflow of the liquid and reducing the formation of a thrombus in the indwelling needle.

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

[0009] When the needle holder or extension tube of the indwelling needle is individually inserted into the outflow channel of the pressure transducer, the needle holder or extension tube of the indwelling needle cannot come into contact with the moving body of the pressure transducer, so there is no significant change in the pressure within the pressure transducer, and therefore the plastic valve and case remain sealed.

[0010] Preferably, the needle receiver or extension tube of the indwelling needle contacts the moving body of the pressure conversion device, moving the moving body and moving the plastic valve, but the moving distance of the plastic valve is small and the plastic valve and the case remain in a sealed state.

[0011] The moving body is provided at the outflow end (outflow channel end) of the pressure conversion device, one end of the connecting member is close to the outflow end and directly or indirectly connected to the moving body, and the other end of the connecting member is close to the inflow end (inflow channel end) and directly or indirectly connected to the connector assembly.

[0012] When an infusion set head or a syringe tip is inserted into the pressure transducer, the connector assembly is moved from the inflow end to the outflow end of the pressure transducer by the movement of the infusion set head, and the moving body is moved in the opposite direction (from the outflow end to the inflow end of the pressure transducer) by the action of the connecting member. The movement of the moving body and / or the connecting member moves, compresses or pulls the elastic structure. When the movement of the moving body from the outflow end to the inflow end reduces the pressure of the liquid in a part of the housing of the pressure transducer and becomes lower than the pressure in the indwelling needle, a negative pressure is generated, and as a result, the liquid moves to the pressure transducer in the indwelling needle. When the negative pressure is later eliminated, the liquid smoothly passes through the pressure transducer and enters the indwelling needle. When the infusion set head or the syringe tip is removed, the infusion set head or the syringe tip moves the connecting member, and the moving direction is from the outflow end to the inflow end. The elastic structure returns to its initial state, restoring the connecting member to its initial state and position, and also moving the mover and the connector assembly in the opposite direction (moving from the inflow channel to the outflow channel). The movement of the mover from the inflow channel to the outflow channel increases the pressure in the liquid chamber in a part of the shell, and when the pressure in the part of the liquid chamber becomes higher than the pressure in the indwelling needle, a positive pressure is generated, which results in the movement of liquid from the pressure transducer into the indwelling needle, thereby avoiding blood from entering the indwelling needle at the moment the infusion set head or syringe tip is removed, and avoiding the formation of a blood clot.

[0013] Preferably, the moving body is composed of one or more members, the moving body is entirely or partially movable, and 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 transducer and the other end directly or indirectly connected to a moving body and / or a connecting member, or an intermediate portion is fixed to a fixed position added within the connector assembly or the pressure transducer and both ends are directly or indirectly connected to the moving body and the connecting member, respectively.

[0015] Preferably, the elastic structure may be one or more sets, and the elastic force of the elastic structure is the rebound force of a spring, or the recovery force generated when an elastic material is compressed, or the recovery force generated when a cavity wall made of a non-elastic material is deformed and twisted, or the elastic structure forms a partial or complete liquid lumen, or a lumen is formed by adding a sealing body based on the present invention, and liquid enters the indwelling needle through the lumen.

[0016] The elastic structure provides the force for the moving body to return to its initial state, and also serves to form a liquid flow path, prevent the liquid from contacting other devices, reduce the contact surface of the liquid, and avoid infection.

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

[0018] Preferably, the connection member is a fulcrum and a low-elasticity soft string-like member and / or a rigid elongated member that bypasses the fulcrum or passes through the fulcrum.

[0019] Preferably, the fulcrum is one end of a fixed point or fixed surface provided within the pressure transducer, and serves to fix the present invention within the pressure transducer.

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

[0021] Preferably, the elastic force of the elastic structure is a spring repulsion force, or a recovery force generated by compression of an elastic material, or a recovery force generated by deformation and twisting of a cavity wall made of a non-elastic material. The elastic structure may form a partial or complete liquid cavity. Preferably, one end of the connection member is directly or indirectly connected to the connector assembly and the other end is directly or indirectly connected to the moving body, and movement of the connector assembly moves the connection member to move the moving body. Movement of the moving body generates negative or positive pressure in a liquid chamber of the pressure transducer.

[0022] Preferably, a fixed member, such as a cross beam, is provided within the pressure transducer.

[0023] Preferably, the elastic structure is provided between the moving body and a case of the pressure transducer or a fixed point within the case, and restores the moving body to an initial state.

[0024] Preferably, the elastic structure is capable of dividing the liquid flow path.

[0025] Preferably, an exhaust passage may be provided within the cross beam.

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

[0027] Preferably, a sealing surface may be added within the pressure transducer to provide a complete liquid passage, thereby avoiding liquid contact with other devices, reducing the liquid contact surface and avoiding infection.

[0028] Preferably, the pressure transducer housing includes a cavity, an inflow channel opening, and an outflow channel opening, the outflow channel opening may be connected to a peripheral venous needle, a central venous needle, and a three-way valve port, and the connector of the inflow channel opening may be connected to and locked with a syringe, an infusion set, or a blood transfusion set.

[0029] Preferably, a flap is provided at the inflow channel opening of the shell, and when the infusion set head is inserted into the pressure transducer, the flap opens under the action of the infusion set head, and when the infusion set head is removed, the flap closes under the action of the elastic structure to close the inflow channel opening. Preferably, the transducer includes a connector assembly, an elastic structure, and a connecting member, and the elastic structure has a shape such as a spiral or semicircular shape, and deformation of the elastic structure generates a change between negative and positive pressure within a portion of the liquid chamber.

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

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

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

[0033] Furthermore, the case of the pressure converter and the case of the infusion connector are shared. Effect of the Invention

[0034] In the present invention, without increasing the number of conventional operations, during infusion, the pressure transducer applies a predetermined negative pressure to the indwelling needle in advance, and sucks the thrombus in the soft sheath of the indwelling needle into the needle receiver of the indwelling needle and the pressure transducer, thereby reducing the probability of the thrombus passing through the indwelling needle and re-entering the patient's blood vessel. After the infusion is completed, the pressure transducer generates a positive pressure, which pushes the liquid in the indwelling needle into the blood vessel, thereby preventing blood from flowing back and reducing the formation of a thrombus in the indwelling needle. [Brief description of the drawings]

[0035] [Figure 1] FIG. 1 is a schematic diagram of a first embodiment of the present invention. [Diagram 2] FIG. 1 is a schematic diagram of a first embodiment of the present invention. [Diagram 3] FIG. 4 is a schematic diagram of Example 2 of the present invention. [Figure 4] FIG. 4 is a schematic diagram of Example 2 of the present invention. [Diagram 5] FIG. 1 is a schematic diagram of Example 3 of the present invention. [Figure 6] FIG. 1 is a schematic diagram of Example 3 of the present invention. [Figure 7] FIG. 1 is a schematic diagram of Example 4 of the present invention. [Figure 8] FIG. 1 is a schematic diagram of Example 4 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0036] Hereinafter, technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, but it is clear that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. The components of the embodiments of the present invention as generally described and illustrated in the drawings may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention shown in the accompanying drawings is not intended to limit the scope of the present invention as claimed, but only represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without exerting creative efforts belong to the protection scope of the present invention.

[0037] It should be noted that like reference numerals and letters indicate like items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined or described in the following drawings. Also, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description, and cannot be understood to indicate or imply any relative importance. EXAMPLES

[0038] Example 1 1, the pressure transducer of the present invention includes a housing 2, an inflow channel opening 3, and an outflow channel opening 4. The connector 4 of the outflow channel opening may be optionally connected to a port such as an indwelling needle in a peripheral vein, a central vein, or a three-way valve, and the connector of the inflow channel opening 3 may be connected to a syringe, an infusion set, a blood transfusion set, or the like, and locked.

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

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

[0041] In order to allow the liquid to smoothly flow into the pressure transducer, a convex or concave point is provided on the top of the plastic valve 5. The plastic valve 5 is connected to the connecting member 1-1, which bypasses the relative fixed point 1-4 and is connected to the moving body 1-2, which is close to the outflow channel of the pressure transducer and its shape matches with the housing of a part of the outflow channel to seal the outflow channel.

[0042] Within the pressure transducer there is provided a fixing point (transverse beam 6) which serves to fix the device according to the invention within the pressure transducer.

[0043] Another elastic member 1-3-2 may be present between the plastic valve 5 and the cross beam 6, which returns the plastic valve 5 to its initial state. An elastic member 1-3-1 is present between the moving body 1-2 and the cross beam 6, and the elastic member 1-3-1 has one end connected to the cross beam 6 and the other end connected to the moving body 1-2.

[0044] The elastic members 1-3-1 and 1-3-2 serve to separate the liquid flow paths, and also form a first chamber 7 together with the housing of the device.

[0045] The mover 1-2 and the outlet channel opening 4 of the pressure transducer constitute the anode end outlet channel 8 that contains the pressure transducer of the present invention. The anode end outlet channel 8 does not need to communicate directly with the first chamber 7 because the shape of the mover 1-2 matches the local housing of the outlet channel. When the mover 1-2 moves upward, the shape of the mover 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 FIG. 2, when the infusion set head 9 is inserted into the pressure transducer including the present invention, the infusion set head 9 moves the plastic valve 5 into the outflow channel of the pressure transducer, and the liquid flows into the first chamber 7 by using the convex or concave point on the top of the plastic valve 5. The movement of the plastic valve 5 moves the connecting member, and moves the moving body 1-2 toward the inflow channel of the pressure transducer through the connecting member. In addition, the elastic structures 1-3-1 and 1-3-2 are compressed. The movement of the moving body 1-2 reduces the local liquid pressure in the anode end outflow channel 8, and when the pressure becomes smaller than the pressure in the indwelling needle, a negative pressure is generated. At this time, the liquid flows in the reverse direction from the indwelling needle to the pressure transducer. When the moving body 1-2 stops moving, the first chamber 7 communicates with the anode end outflow channel 8, and at this time, a complete liquid passage is obtained, making it possible to smoothly transport the liquid into the indwelling needle.

[0047] As shown in FIG. 1, when the infusion of the liquid is completed, the locked state between the infusion set head 9 and the pressure transducer is released. When the infusion set head 9 is removed from the pressure transducer, the infusion set head 9 moves the plastic valve 5 toward the inflow channel, and the plastic valve 5 moves the connecting member 1-1, and moves the moving body 1-2 from the inflow channel toward the outflow channel. In addition, the compressed elastic structures 1-3-1 and 1-3-2 return to their initial state, generating elasticity, which promotes the recovery of the plastic valve 5 to its initial state and the movement of the moving body 1-2 toward the anode end 8 of the connector of the present invention. The movement of the moving body 1-2 increases the pressure of the liquid in the anode end outflow channel 8, and when the pressure becomes higher than the pressure in the indwelling needle, a positive pressure is generated. At this time, the liquid flows from the device of the present invention toward the indwelling needle. When the moving body 1-2 stops moving, the moving body 1-2 inhibits communication between the first chamber 7 and the anode end outflow channel 8, and the pressure transducer returns to its natural state and shows a sealed state. EXAMPLES

[0048] Example 2 3 and 4 show another embodiment of the present invention.

[0049] The following points are different from the first embodiment.

[0050] The inflow channel opening of the shell is provided with a flap 10, and when the infusion set head 9 is inserted into the pressure transducer, the flap 10 opens under the action of the infusion set head, and when the infusion set head 9 is removed, the flap 10 closes under the action of the elastic structure, closing the inflow channel opening. The connector assembly 5 is a conduit structure, and liquid can flow through the conduit.

[0051] The shell is provided with a moving body 1-2 at the outlet channel opening, and the moving body 1-2 has a cell. When the infusion set head 9 is inserted into the pressure transducer, the moving body 1-2 moves from the outlet channel to the inflow channel, generating negative pressure, and the cell of the moving body 1-2 communicates with the liquid passage, and the outlet channel opening is opened. When the infusion set head 9 is removed, the moving body 1-2 moves from the inflow channel to the outlet channel, generating positive pressure, and the movement of the moving body 1-2 closes the outlet channel opening. There are sealing membranes 11 between the connector assembly 5 and the case, and between the moving body 1-2 and the case, which prevent the liquid from contacting with other parts of the invention and prevent infection. EXAMPLES

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

[0053] The following points are different from Example 2.

[0054] The moving body 1-2 at the outlet channel opening of the shell is composed of one or more opening and closing members. One end of the moving body is connected to the shell 2, and the other end is connected to the cross beam 6. An elastic structure 1-3-1 is provided below the opening and closing member, and an elastic structure 1-3-2 is provided between the cross beam and the plastic valve 5, thereby forming a closed liquid path. A sealed membrane 11 is present between the moving body 1-2 and the cross beam 6, thereby forming a liquid path. EXAMPLES

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

[0056] The following points are different from Example 3 (see Figures 7 and 8):

[0057] The connecting member, the moving body and the elastic structure are designed integrally, and are named as the connecting conversion part 1-5, the moving body and the elastic structure part 1-6, respectively.

[0058] The elastic structural portion 1-6 functions as a moving body to change the local pressure of the liquid, and also serves to close the liquid lumen, thereby preventing contact between the liquid and other devices of the present invention, ensuring sterility, and ensuring conditions such as drug mixing.

[0059] When the infusion set head 9 is inserted into the pressure transducer, the connector assembly 5 and one end of the connection conversion part 1-5 move to the outflow channel end, so that the moving body and the elastic structure part 1-6 gradually move toward the inflow channel end, so that the local liquid pressure changes, and when the local liquid pressure becomes lower than the liquid pressure in the indwelling needle, the liquid moves from the indwelling needle toward the pressure transducer. Also, the curved part of the elastic structure part unfolds and communicates with the liquid passage, and when the infusion set head 9 is inserted into the pressure transducer and locked, the liquid passage becomes smooth, and the drug or liquid passes through the device of the present invention and enters the indwelling needle or the blood vessel of the living body.

[0060] When the pressure conversion device is removed from the infusion set head 9, the curve of the elastic structure returns to its original state due to the restoring elasticity caused by the shape of the elastic structure of the moving body and the elastic structure part 1-6, changing the local liquid pressure and generating positive pressure, thereby restoring the device of the present invention to its initial state.

[0061] Preferably, the device of the present invention functions as a connector of the moving body in the tension or compression process, and the angle 12 of the connector itself is constant (see Fig. 7 and Fig. 8). In addition, all the connection / connection relationships described in this specification do not mean that a single member is directly connected, but that a better connection structure can be configured by adding or reducing auxiliary connection parts according to the specific implementation situation. Each technical feature in the creation of the present invention can be combined with each other as long as it is not contradictory to each other.

[0062] It should be noted that those skilled in the art may make changes and modifications to the above embodiments based on the disclosure and description of the above specification. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some equivalent modifications and changes to the present invention should also be included within the scope of the claims of the present invention. Furthermore, although specific terms are used in this specification, these terms are for the convenience of description and do not limit the present invention.

[0063] Those skilled in the art will easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. [Explanation of symbols]

[0064] 1 Conversion material 1-1 Connection parts 1-1-1 Inlet channel end of connecting member 1-1-2 Outlet channel end of connecting member 1-2 Mobile 1-3 Elastic structure 1-4 Relative fixed point 2. Housing 3. Inlet Channel Opening 4. Outflow Channel Opening 5 Plastic Valve 6 Horizontal beam 7 Room 1 8 Anode Outflow Channel 9 Infusion set head 10 Flap 11 Sealing membrane 12 Angles of connecting objects

Claims

1. A pressure transducer for use in an infusion connector, comprising: A pressure conversion device characterized in that a conversion member is provided within the pressure conversion device, the conversion member being switchable between a natural state and a compressed state, in the natural state, the conversion member seals a cavity of the pressure conversion device, and under the action of external pressure, the conversion member switches from the natural state to the compressed state, the cavity of the pressure conversion device being connected to an external fluid, negative pressure is generated within a predetermined time period within the pressure conversion device, and 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 period.

2. The pressure conversion device of claim 1, characterized in that the conversion member includes a connector assembly, an elastic structure, a moving body, and a connecting member, the moving body being provided at the outflow end of the pressure conversion device, one end of the connecting member being close to the outflow end and directly or indirectly connected to the moving body, and the other end of the connecting member being close to the inflow end of the pressure conversion device and directly or indirectly connected to the connector assembly.

3. 3. The pressure transducer according to claim 2, wherein the connection member includes a fulcrum, and a soft string-like member and / or a rigid elongated member that bypasses the fulcrum or passes through the fulcrum.

4. 4. The pressure transducer of claim 3, wherein the fulcrum is a point, a side, or one or more points on a side near an inlet end of the pressure transducer.

5. The pressure conversion device described in claim 2, characterized in that one end of the elastic structure is connected to a fixed position added within the connector assembly or the pressure conversion device, and the other end is directly or indirectly connected to a moving body and / or a connecting member, or an intermediate portion is fixed to a fixed position added within the connector assembly or the pressure conversion device, and both ends are directly or indirectly connected to a moving body and a connecting member, respectively.

6. The pressure transducer according to claim 2, characterized in that the movable body is composed of one or more members, the movable body is movable in whole or in part, and pressure can be locally changed through deformation.

7. 3. The pressure transducer of claim 2, further comprising a fixing member provided within a housing of the pressure transducer.

8. The pressure transducer of claim 5, characterized in that the elastic structure may be one or more sets, the elastic force of the elastic structure being the repulsive force of a spring or a recovery force generated when an elastic material is compressed, or a recovery force generated when a cavity wall made of a non-elastic material is deformed and twisted, or the elastic structure forms a partial or complete liquid lumen, or forms a lumen by adding a sealing body based on the present invention, and liquid enters the indwelling needle through the lumen.

9. 3. The pressure transducer of claim 2, wherein said connector assembly is a plastic valve.

10. 3. The pressure transducer according to claim 2, wherein at least two of the connector assembly, the connecting member, the moving body, and the elastic structure are integrally molded.

11. The pressure conversion device of claim 1, characterized in that the conversion member includes a plastic valve, an elastic structure, and a connecting member, the shape of the elastic structure is a spiral or semicircular shape, etc., and deformation of the elastic structure causes a change between negative pressure and positive pressure in a part of the liquid chamber.

12. A connector for infusion, A connector for infusion comprising the pressure transducer according to any one of claims 1 to 11.

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