Self-adapting sealing medical needleless valve body based on shape memory material

Abstract

This invention discloses an adaptive sealing medical needleless valve body based on shape memory materials, belonging to the field of medical infusion consumables technology. It aims to solve the technical problem of weak adaptive compensation capability. The valve body includes a needleless valve body, an input connecting pipe, and an output connecting pipe. Multiple guide plates are fixed to the vertical inner wall of the valve body. A partition plate is horizontally fixed between the guide plates. A cone is fixed to the top of the partition plate. Multiple oblique grooves are provided inside the cone, and spring strips for increasing the cone's reset capability are installed inside these grooves. This invention achieves the beneficial effects of adaptive adjustment of the sealing gap, sensitive reset response, and no gap expansion over long-term use by utilizing the elastic deformation of the cone during pressing, combined with the compression and energy storage of the spring strips, and the coordinated rapid rebound of the cone's shape memory recovery force and the elastic force of the spring strips after depressurization. This solves the technical problem of weak adaptive compensation capability in existing medical needleless valve body sealing structures.

Description

Technical Field

[0001] This invention relates to the field of medical infusion consumables technology, and more specifically, to an adaptive sealing medical needleless valve body based on shape memory materials. Background Technology

[0002] Needleless medical valve bodies are core components that replace traditional needle puncture connections and enable closed-loop transmission of medical fluids. They effectively avoid medical risks such as needlestick injuries and cross-infection, and are currently widely used in clinical infusion, emergency drug administration, and intensive care settings. Existing commercially available needleless medical valve bodies mostly use ordinary silicone, rubber, and other elastic polymer materials for their sealing structures, relying on the material's own elastic deformation to achieve contact sealing and fluid flow control.

[0003] Shape memory materials, as novel intelligent functional materials, mainly include shape memory alloys (SMA) and medical shape memory polymers (SMP). They possess reversible deformation characteristics that respond to temperature and pressure, allowing them to recover a preset shape under specific operating conditions. Furthermore, they exhibit high deformation accuracy, stable response, and excellent biocompatibility, giving them irreplaceable advantages in the field of precision medical devices. Traditional sealing structures are passive rigid seals, unable to adaptively compensate for infusion pressure, connector specifications, and tubing deformation. Their adaptability to different needleless connector specifications and varying flow rates and pressures is extremely poor, leading to seal depressurization during high-pressure infusions and leakage through gaps during low-pressure static conditions. Therefore, we propose an adaptive sealing medical needleless valve body based on shape memory materials. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art, adapt to practical needs, and provide an adaptive sealing medical needleless valve body based on shape memory materials to solve the current technical problem of weak adaptive compensation capability.

[0005] To solve the above technical problems, the present invention provides the following technical solution: an adaptive sealing medical needleless valve body based on shape memory material, comprising a needleless valve body body, an input connecting pipe and an output connecting pipe, wherein the input connecting pipe and the output connecting pipe are respectively connected to the upper and lower ends of the needleless valve body body, wherein multiple guide plates are fixed on the vertical inner wall of the needleless valve body body, multiple vertical and horizontal flow channels for drug liquid are formed between the multiple guide plates, and a separator plate is fixed together between the multiple guide plates. A cone is fixed to the top of the separator plate. The cone has multiple inclined grooves inside. Spring strips for increasing the cone's reset capability are installed inside the multiple inclined grooves. A limit groove is provided inside the cone. A rotating column is rotatably connected inside the limit groove. A rotating sealing frame is connected to the bottom of the rotating column.

[0006] Preferably, one of the guide plates is laterally fixed with a fixing rod on the side near the rotating column, the outer periphery of the rotating column is provided with a spiral groove, and the end of the fixing rod is slidably disposed inside the spiral groove to provide rotational force for the rotating column.

[0007] Preferably, a sealing disc is fixed inside the needleless valve body. The sealing disc is located at the bottom of multiple guide plates, and the surface of the sealing disc is provided with multiple guide grooves for the downward flow of the drug solution.

[0008] Preferably, the top of the rotating sealing frame is fixed with a plurality of sealing blocks for sealing the guide channel, the bottom of the plurality of guide channels is provided with a cutting groove to facilitate the sealing block to rotate upward and enter the guide channel, and the top of the plurality of sealing blocks is provided with a chamfer to facilitate the sealing block to rotate upward and enter the guide channel.

[0009] Preferably, the inner top of the needleless valve body is provided with a two-stage stepped annular sealing groove, and a stepped sealing ring is vertically slidably disposed inside the two-stage stepped annular sealing groove.

[0010] Preferably, the top of the cone is provided with a positioning groove, and the top of the positioning groove is provided with a sealing ball for cooperating with the stepped sealing ring to seal the internal channel of the needleless valve body.

[0011] Preferably, the inner bottom of the needleless valve body is provided with an inverted conical groove, the inverted conical groove is located below the sealing disc, and the rotating sealing frame is movably located inside the inverted conical groove.

[0012] Preferably, multiple petal-shaped one-way sealing valve plates are installed inside the connection between the needleless valve body and the output connecting pipe, and a cross is fixed to the inner bottom wall of the inverted conical groove to prevent the petal-shaped one-way sealing valve plates from shifting in the opposite direction.

[0013] Preferably, the cone is a medical-grade shape memory polymer.

[0014] Preferably, the roots of multiple petal-shaped one-way sealing valve plates are integrally connected to form a ring, which is tightly embedded in the groove on the top wall of the output connection pipe, and the free ends are drawn inward, so that they fit together under normal conditions to form a closed central hole.

[0015] Compared with the prior art, the beneficial effects of the present invention are: This invention designs a cone made of medical-grade shape memory polymer material, multiple oblique grooves inside the cone, and a spring strip structure installed in the oblique grooves. This achieves the functions of elastic deformation of the cone during pressing, combined with the compression and energy storage of the spring strip, rapid rebound of the cone's shape memory recovery force and the elastic force of the spring strip after pressure release, and dynamic compensation of the sealing gap. It achieves the beneficial effects of adaptive adjustment of the sealing gap, sensitive reset response, and no gap expansion after long-term use. It solves the technical problems of existing medical needleless valve body sealing structures, such as weak adaptive compensation ability, slow reset response, easy expansion of sealing gap after repeated insertion and removal, sealing failure and leakage in low temperature / high pressure scenarios, and poor sealing stability.

[0016] This invention also achieves the following effects by designing a spiral groove on the outer periphery of the rotating column, a fixed rod on the inner side of the guide plate, a rotating sealing frame at the bottom of the rotating column, a sealing block on the sealing frame, and a sealing disc structure at the bottom of the guide plate. This allows the linear downward movement of the cone to be precisely converted into the rotational movement of the rotating column through the spiral groove and the fixed rod. The sealing block synchronously fits / detaches from the sealing disc guide groove with the rotation, and the sealing surface dynamically fits and matches with the opening and closing action. This results in the beneficial effects of smooth opening and closing action, adaptive adjustment of the sealing surface fit with the action, minimal wear after repeated use, and no loosening of the seal under pressure fluctuations. It further solves the technical problems of the sealing component not being able to adaptively adjust with the insertion and removal action, the sealing fit decreasing after long-term use, easy leakage under high / negative pressure fluctuations in infusion, and easy jamming during the opening and closing process, which leads to laborious operation.

[0017] This invention, through the design of a two-stage stepped annular sealing groove at the top of the needleless valve body, a stepped sealing ring that slides vertically within the groove, a petal-shaped one-way sealing valve plate within the output connecting pipe, and a cross structure on the bottom wall of the inverted conical groove, achieves the functions of multi-level adaptive sealing at the top, one-way elastic adaptive closure at the end, and valve plate reverse offset limiting to prevent failure. It achieves the beneficial effects of constructing a "top + middle + end" triple adaptive sealing system, adapting to the different insertion and removal forces of adults / elderly / infants, preventing backflow and air backflow at the end, and preventing valve plate deformation and failure in different clinical scenarios. It solves the technical problems of single sealing level, easy reverse deformation and failure of end seal, inability to adapt to weak force / high frequency insertion and removal needs, and insufficient overall sealing reliability leading to increased infection risk in different clinical scenarios. Attached Figure Description

[0018] Figure 1 This is a complete structural schematic diagram of the present invention; Figure 2 This is a vertical sectional view of the present invention; Figure 3 This is a cross-sectional view of the present invention; Figure 4 This is a schematic diagram of the internal structure of the present invention; Figure 5 For the present invention Figure 2 Enlarged view of point A in the middle; Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle; Figure 7 For the present invention Figure 4 Enlarged view of point C in the middle; Figure 8 This is a schematic diagram of the rotating sealing frame of the present invention.

[0019] The following are the labels in the diagram: 1. Needleless valve body; 101. Input connection pipe; 102. Output connection pipe; 2. Two-stage stepped annular sealing groove; 201. Stepped sealing ring; 202. Sealing ball; 203. Guide plate; 3. Divider plate; 301. Cone; 302. Inclined groove; 303. Spring strip; 304. Limiting groove; 305. Positioning groove; 4. Rotating column; 401. Spiral groove; 402. Fixing rod; 403. Rotating sealing frame; 404. Sealing block; 405. Sealing disc; 406. Guide groove; 5. Cross; 501. Petal-shaped one-way sealing valve plate; 6. Inverted conical groove. Detailed Implementation

[0020] like Figures 1 to 8 As shown, the adaptive sealing medical needleless valve body based on shape memory material involved in this invention includes a needleless valve body body 1, an input connecting pipe 101, and an output connecting pipe 102, forming a closed channel for drug delivery, realizing needleless plug-in connection, and providing an installation carrier for internal functional components. The needleless valve body body 1 is a hollow cylindrical structure. The input connecting pipe 101 (with anti-slip texture / adaptive thread on the outer periphery) is integrally formed on the top of the body, and the output connecting pipe 102 is integrally formed on the bottom of the body. The two are coaxially connected, and the side wall of the body is marked with an arrow indicating the direction of drug flow. The input connecting pipe 101 is directly adapted to the needleless infusion connector, allowing drug to be introduced without puncture and avoiding the risk of needle prick; the output connecting pipe 102 is adapted to medical infusion tubing to realize drug export; the internal space of the body provides a stable installation position for components such as the guide plate 203 and the separator 3, ensuring the coaxiality and movement accuracy of each component. The input connecting pipe 101 and the output connecting pipe 102 are respectively connected to the upper and lower ends of the needleless valve body 1. The needleless valve body 1 is characterized in that a plurality of guide plates 203 are fixed on the vertical inner wall, a plurality of vertical and horizontal channels for the liquid are formed between the plurality of guide plates 203, and a partition plate 3 is fixed together between the plurality of guide plates 203. A cone 301 is fixed to the top of the separator 3. The cone 301 is made of medical shape memory polymer. Multiple inclined grooves 302 are provided inside the cone 301. Spring strips 303 for increasing the reset capability of the cone 301 are installed inside the multiple inclined grooves 302. A limiting groove 304 is provided inside the cone 301. A rotating column 4 is rotatably connected inside the limiting groove 304. A rotating sealing frame 403 is connected to the bottom of the rotating column 4 to realize the force transmission of the pressing action. By utilizing the characteristics of shape memory polymer and the assistance of spring strips, rapid adaptive reset and sealing are achieved. The cone 301 is fixed at the central through hole of the partition plate 3, and a positioning groove 305 is opened at the top. The sealing ball 202 is embedded in the groove and is in contact with the lower end face of the stepped sealing ring 201 under normal conditions. The cone 301 is made of medical shape memory polymer material, and multiple oblique grooves 302 are opened inside. The spring strips 303 are installed in the grooves, and a limiting groove 304 is set in the center. The upper end of the rotating column 4 is rotatably connected to the limiting groove 304. Under normal conditions, the plugging ball 202 and the stepped sealing ring 201 work together to form a second seal inside the valve body, preventing the liquid medicine from contacting the outside. When pressed, the stepped sealing ring 201 pushes the plugging ball 202, causing the cone 301 to move downward. The cone deforms under pressure, and the spring strip 303 is compressed and stores the reset elastic force. After the pressing force is removed, the cone 301 rebounds under the combined action of its own shape memory recovery force (quickly returning to its initial shape at room temperature) and the auxiliary elastic force of the spring strip 303, causing the plugging ball 202 to move upward and reset, re-fitting and sealing with the stepped sealing ring 201, achieving a delay-free reset and preventing liquid medicine leakage.

[0021] One of the guide plates 203 has a fixing rod 402 horizontally fixed on one side near the rotating column 4. The outer circumference of the rotating column 4 is provided with a spiral groove 401. The end of the fixing rod 402 is slidably disposed inside the spiral groove 401 to provide rotational force for the rotating column 4, converting the linear downward movement of the cone 301 into the rotational movement of the rotating column 4, thereby realizing the linkage control of the opening and closing action. One of the guide plates 203 has a fixing rod 402 horizontally fixed on one side near the rotating column 4, with a smooth round head at the end. The outer circumference of the rotating column 4 has a continuous spiral groove 401. The round head end of the fixing rod 402 is slidably embedded in the spiral groove 401. The upper end of the rotating column 4 is rotatably connected to the limiting groove 304 of the cone 301, and the lower end is fixedly connected to the rotating sealing frame 403. When the cone 301 is pressed and drives the rotating column 4 to move downward, the end of the fixed rod 402 slides along the wall of the spiral groove 401. The force of the inclined surface of the groove wall forces the rotating column 4 to rotate in the positive direction around its own axis. After the pressing force is removed, the cone 301 rebounds and drives the rotating column 4 to move upward. The fixed rod 402 slides in the opposite direction along the spiral groove 401, driving the rotating column 4 to rotate in the opposite direction. This realizes the bidirectional conversion between linear motion and rotational motion, providing precise power for the opening and closing action of the bottom sealing frame and ensuring the synchronization of the action.

[0022] The needleless valve body 1 has a sealing disc 405 fixed inside. The sealing disc 405 is located at the bottom of multiple guide plates 203. The surface of the sealing disc 405 is provided with multiple guide channels 406 for the downward flow of the drug solution. Multiple sealing blocks 404 for sealing the guide channels 406 are fixed at the top of the rotating sealing frame 403. The bottom of each guide channel 406 is provided with a cutting groove to facilitate the upward rotation of the sealing block 404 into the guide channel 406. The top of each sealing block 404 is provided with a chamfer to facilitate the upward rotation of the sealing block 404 into the guide channel 406. The opening and closing of the drug solution channel is achieved by rotation. Under normal conditions, the middle is sealed. During infusion, the seal is released to allow the drug solution to flow. The sealing disc 405 is horizontally fixed to the bottom of multiple guide plates 203. Multiple guide grooves 406 are evenly opened on the surface of the disc, and cutting grooves are set at the edges of the grooves. The rotating sealing frame 403 is fixed to the bottom of the rotating column 4. Multiple sealing blocks 404 are evenly fixed on the frame. The top of the sealing block 404 is chamfered. Under normal conditions, the sealing block 404 is embedded in the guide groove 406 to achieve groove sealing. Under normal conditions, the sealing block 404 is embedded in the guide groove 406, blocking the liquid passage and forming a seal in the middle of the valve body, forming triple protection with the two top seals. When the rotating column 4 drives the rotating sealing frame 403 to rotate forward, the sealing block 404 is smoothly rotated out along the cutting groove at the edge of the guide groove 406. The chamfer design avoids jamming. The guide groove 406 is fully open, and the liquid can flow downward. When rotating in the reverse direction, the sealing block 404 is screwed back into the guide groove 406 to achieve sealing and prevent liquid backflow and leakage caused by pressure fluctuations.

[0023] The inner top of the needleless valve body 1 is provided with a two-stage stepped annular sealing groove 2. A stepped sealing ring 201 is vertically slidably disposed inside the two-stage stepped annular sealing groove 2. The top of the cone 301 is provided with a positioning groove 305. The top of the positioning groove 305 is provided with a sealing ball 202 for cooperating with the stepped sealing ring 201 to seal the internal channel of the needleless valve body 1, so as to achieve top sealing of the valve body under normal conditions, prevent external contaminants from entering, and provide initial trigger stroke for push-type opening and closing. The two-stage stepped annular sealing groove 2 is opened in the inner top of the needleless valve body 1 and is a two-stage stepped annular groove. The stepped sealing ring 201 is a stepped elastic ring adapted to the groove and is vertically slidably embedded in the sealing groove 2. Under normal conditions, the upper end face of the ring is in contact with the inner wall of the input connecting pipe 101, and the lower end face is in contact with the sealing ball 202. Under normal conditions, the stepped sealing ring 201 fits tightly against the inner wall of the input connecting pipe 101, forming the first end face seal to prevent external bacteria and dust from entering the valve body. When the infusion connector is pressed, the connector end face pushes the stepped sealing ring 201 to slide down along the sealing groove 2, which not only releases the initial seal but also directly transmits the pressing stroke to the sealing ball 202, triggering subsequent linkage actions.

[0024] The bottom of the needleless valve body 1 is provided with an inverted conical groove 6, which is located below the sealing disc 405. The rotating sealing bracket 403 is movably located inside the inverted conical groove 6. Multiple petal-shaped one-way sealing valve pieces 501 are installed inside the connection between the needleless valve body 1 and the output connecting pipe 102. The bottom wall of the inverted conical groove 6 is fixed with a cross 5 to prevent the petal-shaped one-way sealing valve pieces 501 from shifting in the opposite direction. The roots of the multiple petal-shaped one-way sealing valve pieces 501 are integrally connected into a ring, which is embedded in the groove on the top wall of the output connecting pipe 102, and the free ends are drawn inward. Under normal conditions, they fit together to form a closed central hole, realizing one-way sealing at the end of the valve body, preventing backflow of medicine and backflow of air, and avoiding reverse deformation and failure of the valve pieces. A groove is formed on the inner top wall of the output connecting pipe 102. The roots of multiple petal-shaped one-way sealing valve discs 501 are integrally connected into a ring and embedded in the groove. The free ends are tapered inward, and under normal conditions, the petal tips fit together to form a closed central hole. A cross 5 is fixed to the bottom wall of the inverted conical groove 6, located above the petal-shaped one-way sealing valve discs 501. Under normal conditions, the petal-shaped one-way sealing valve discs 501 rely on their own elastic petal tips to achieve end sealing, forming a double anti-backflow seal with the central sealing block 404 to prevent backflow of the medicine and air from entering the pipeline. During infusion, the downward pressure of the medicine opens the petal tips, and the medicine flows out unidirectionally from the gap between the petals. The cross 5 limits the upper surface of the valve disc to prevent the petals from flipping upward when the medicine flows back, ensuring the reliability of the one-way seal, while reducing the dead angle between the valve disc and the valve body, facilitating cleaning and disinfection.

[0025] Working principle: This embodiment provides an adaptive sealing medical needleless valve body based on shape memory material. When the needleless infusion connector presses the input connecting tube 101, it pushes the stepped sealing ring 201 at the top of the inner part to slide downward along the secondary stepped annular sealing groove 2, releasing the initial end face seal. The downward force of the stepped sealing ring 201 acts on the sealing ball 202, causing the cone 301 made of shape memory polymer material to move downward synchronously. When the cone is compressed, the internal spring strip 303 deforms and stores the reset elastic force, while driving the rotating column 4 to move downward through the limiting groove 304. The fixing rod 402 on the guide plate 203 is embedded in the spiral groove 401 on the outer periphery of the rotating column 4, converting the linear downward movement into the positive rotation of the rotating column 4. The rotation causes the bottom rotating sealing frame 403 to rotate synchronously; the sealing block 404 is screwed out from the guide groove 406 of the sealing disc 405, releasing the middle seal, and the liquid flows downward through the vertical channel between the guide plates 203 and the guide groove 406, opening the petal-shaped one-way sealing valve 501 in the output connecting pipe 102 and flowing out; after the pressing pressure is removed, the cone 301 rebounds quickly under the combined action of shape memory restoring force and spring strip 303, causing the rotating column 4 to rotate in the opposite direction, and the sealing block 404 is screwed back into the guide groove 406 to achieve the middle seal. At the same time, the stepped sealing ring 201 and the sealing ball 202 are reset and fitted, and the petal valve closes, forming a multi-seal anti-backflow state.

[0026] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A self-adapting needleless valve body based on shape memory material, comprising a needleless valve body (1), an input connecting pipe (101) and an output connecting pipe (102), the input connecting pipe (101) and the output connecting pipe (102) are respectively arranged at the upper and lower ends of the needleless valve body (1), characterized in that, The vertical inner wall of the needleless valve body (1) is fixed with a plurality of guide plates (203), a plurality of liquid vertical flow channels are formed between the plurality of guide plates (203), and a partition disc (3) is fixed transversely between the plurality of guide plates (203). The top of the partition disc (3) is fixed with a cone (301), a plurality of inclined grooves (302) are arranged in the cone (301), a plurality of spring strips (303) for increasing the reset ability of the cone (301) are arranged in the plurality of inclined grooves (302), a limiting groove (304) is arranged in the cone (301), a rotating column (4) is rotatably connected in the limiting groove (304), and a rotating plugging frame (403) is connected to the bottom of the rotating column (4).

2. The self-sealing needleless valve body based on shape memory material according to claim 1, characterized in that One side of one of the guide plates (203) near the rotating column (4) is transversely fixed with a fixed rod (402), a spiral groove (401) is arranged on the outer periphery of the rotating column (4), and the end of the fixed rod (402) is slidably arranged in the spiral groove (401) to provide a rotating force for the rotating column (4).

3. The self-sealing needleless valve body based on shape memory material according to claim 1, characterized in that, The inside of the needleless valve body (1) is fixed with a plugging disc (405), the plugging disc (405) is arranged at the bottom of the plurality of guide plates (203), and the surface of the plugging disc (405) is provided with a plurality of guide flow grooves (406) for downward flow of liquid.

4. The self-sealing needleless valve body based on shape memory material according to claim 3, characterized in that The top of the rotating plugging frame (403) is fixed with a plurality of plugging blocks (404) for plugging the guide flow grooves (406), the bottom of each of the plurality of guide flow grooves (406) is provided with a cutting groove for facilitating upward rotation of the plugging block (404) into the guide flow groove (406), and the top of each of the plurality of plugging blocks (404) is provided with a chamfer for facilitating upward rotation of the plugging block (404) into the guide flow groove (406).

5. The self-sealing needleless valve body based on shape memory material according to claim 1, characterized in that, The inner top of the needleless valve body (1) is provided with a two-stage stepped annular sealing groove (2), and the inside of the two-stage stepped annular sealing groove (2) is vertically slidably provided with a stepped sealing ring (201).

6. The self-sealing needleless valve body based on shape memory material according to claim 5, characterized in that The top of the cone (301) is provided with a positioning groove (305), and the top of the positioning groove (305) is provided with a plugging ball (202) for cooperating with the stepped sealing ring (201) to plug the internal passage of the needleless valve body (1).

7. The self-sealing needleless valve body based on shape memory material according to claim 3, characterized in that, The inner bottom of the needleless valve body (1) is provided with an inverted conical groove (6), the inverted conical groove (6) is arranged below the plugging disc (405), and the rotating plugging frame (403) is movably arranged in the inverted conical groove (6).

8. The self-sealing needleless valve body based on shape memory material according to claim 7, characterized in that A plurality of petal-shaped one-way sealing valve plates (501) are arranged in the connection between the needleless valve body (1) and the output connecting pipe (102), and a cross frame (5) is fixed to the inner bottom wall of the inverted conical groove (6) to prevent the petal-shaped one-way sealing valve plates (501) from being offset in the reverse direction.

9. The self-sealing needleless valve body based on shape memory material according to claim 1, characterized in that, The cone (301) is a medical shape memory polymer.

10. The self-sealing needleless valve body based on shape memory material according to claim 8, characterized in that, The roots of the plurality of petal-shaped one-way sealing valve plates (501) are integrally connected into a ring and are tightly embedded in the inner top wall clamping groove of the output connecting pipe (102), and the free ends are inwardly retracted, and in a normal state, the free ends are mutually adhered to form a closed central hole.

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