Medical three-way rotary valve with constant interface pressure and drainage device

Abstract

The application discloses a medical three-way rotary valve and drainage device with sustained interface pressure, which comprises a valve body, a valve core rotatably inserted into the valve body, and a knob fixed to the top end of the valve core. The inner circumferential wall of the valve body is provided with an inner conical surface, and the outer circumferential wall of the valve core is provided with an outer conical surface matched with the inner conical surface. The axial small end of the valve core points to the bottom end of the valve body. The rotary valve further comprises a force applying mechanism which always provides a sustained force to the valve core to make it move towards the small end, so that the inner and outer conical surfaces always keep close contact and sustain the interface pressure. The beneficial effects of the application mainly lie in that the sustained, controllable and posture change independent normal pressure is introduced between the cooperation interface of the valve body and the valve core. The sustained pressure can compensate for the increase of micro gap between the interface caused by temperature fluctuation, material creep or slight wear, and can also ensure that the valve core and the valve body always keep close contact at any angle, thereby improving the overall sealing durability and anti-leakage ability of the medical three-way rotary valve.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a medical three-way rotary valve and drainage device. Background Technology

[0002] In existing clinical drainage techniques, three-way rotary valves are widely used as key components for directional control and on / off switching. For example, the drainage device disclosed in Chinese patent CN210186122U typically employs this type of valve. Whether applied to industrial pipelines or medical infusion / drainage systems, the valve's sealing performance is always one of the core indicators for measuring its reliability. This is especially true in medical settings where sterility, leak prevention, and contamination prevention requirements are extremely stringent, as the long-term stability of the seal directly affects patient safety and treatment effectiveness.

[0003] Currently, the sealing methods of medical three-way rotary valves can be mainly classified into two technical routes. One type is to achieve interface sealing by using an independently installed elastic sealing ring, such as the solution disclosed in Chinese patent CN216222356U. This type of structure has certain advantages in terms of ease of assembly and initial sealing effect, but its inherent defect is that the sealing ring is mostly made of high molecular elastic material. After long-term contact with liquid medicine, disinfectant or temperature change, it will inevitably age, harden or even develop microcracks, resulting in a significant decline in sealing performance over time, thus creating a risk of leakage.

[0004] Another technical approach utilizes the tapered mating surface between the valve body and the valve core to improve the sealing effect. This can be seen in the structure disclosed in Chinese patent CN205924694U, which relies on a small tapered interface to enhance the sealing. However, the actual effectiveness of this type of tapered seal largely depends on the axial clamping force generated by the valve core's own gravity to ensure a tight fit between the tapered surfaces. In real clinical settings, medical three-way rotary valves are typically installed vertically and suspended on infusion stands or drainage racks beside the bed. The axial direction of the valve core is not always aligned with the direction of gravity. In most cases, gravity not only fails to effectively enhance the contact pressure between the tapered surfaces but may also weaken the tightness of the fit due to shaking, tubing tension, or frictional resistance from the valve core support structure, resulting in a sealing margin far lower than designed. It should also be noted that in actual use, it has been found that the existing technology, which only uses a small section of a conical interface, actually causes excessive local pressure in that area, resulting in faster wear during daily operation. In addition, because the weight of the valve core of the medical three-way rotary valve does not cause the interface to fit properly in actual use, it is actually more prone to leakage. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a medical three-way rotary valve and drainage device with continuous interface pressure.

[0006] The objective of this invention is achieved through the following technical solution: A medical three-way rotary valve with continuous interfacial pressure, comprising: A valve body has a hollow cylindrical structure, and a first inlet, a second inlet, and an outlet are radially connected on the side wall of the main body; A valve core is axially rotatably inserted into the body of the valve body, and the valve core has a liquid channel for selective flow of liquid medicine. A knob is fixedly mounted on the axial top end of the valve core and located above the valve body. The knob is used to drive the valve core to rotate relative to the valve body around its own axis by an external force, thereby selectively opening or cutting off the fluid passage between the first inlet and / or the second inlet and the outlet through the rotation of the valve core. The inner peripheral wall of the valve body is configured as an inner conical surface, and the outer peripheral wall of the valve core is configured as an outer conical surface that slides tightly with the inner conical surface in both the axial and circumferential directions, with the axial small end of the valve core pointing towards the inner bottom end of the body.

[0007] The medical three-way rotary valve also includes a force-applying mechanism for applying axial bias pressure to the valve core. The force-applying mechanism continuously provides the valve core with a force that causes it to displace along its own axis toward its small end. The continuous force ensures that the outer conical surface and the inner conical surface always maintain a tight conical contact state, and continuously generates an interface clamping force at their mating interface to prevent leakage of the drug solution.

[0008] Preferably, a valve seat is detachably fitted and fixedly connected to the valve body on the side away from the knob in the axial direction, and the axial free end of the valve core extends axially out of the bottom end of the valve body and is fixedly connected to the valve seat.

[0009] Preferably, the axial free end of the valve core is integrally formed with a plurality of circumferentially distributed petal-type elastic buckles, and the outer end face of the valve seat is provided with a snap-fit ​​groove corresponding to the petal-type elastic buckles. The valve core is axially fixedly connected to the valve seat by the radial expansion snap-fit ​​of the petal-type elastic buckles and the snap-fit ​​groove, so as to realize a stable linkage between the valve core and the valve seat.

[0010] Preferably, the force-applying mechanism is an elastic element disposed between the axial bottom end face of the valve seat and the valve body. The elastic element is axially compressed and abuts against the valve seat and the valve body. The elastic element uses its own elastic restoring force to continuously apply the continuous force to the valve seat, thereby causing the valve core to always have a displacement tendency toward its small end through the valve seat.

[0011] Preferably, the elastic element is selected from any of the following elastic elements: a metal elastic gasket, a linear helical spring, or elastic rubber.

[0012] Preferably, the force-applying mechanism is an elastic element disposed between the knob and the valve body. The elastic element is axially compressed and abuts against the knob and the valve body. The elastic element uses its own elastic restoring force to continuously apply the continuous force to the knob, thereby causing the valve core to always have a displacement tendency toward its small end through the knob.

[0013] Preferably, the valve body has a flange portion, a limiting member is fixed inside the knob, the limiting member has an abutment portion, and the elastic element is a linear helical spring with its two ends abutting against the flange portion and the abutment portion, respectively.

[0014] Preferably, the valve seat has at least one groove on one end face facing the valve body, and the outer edge of the bottom axial end of the valve body has a protrusion corresponding to the position of the groove. The protrusion fits into the groove, thereby forming a limiting fit structure in the circumferential direction to prevent the valve seat from rotating circumferentially relative to the valve body during the rotation of the valve core.

[0015] Preferably, a plurality of limiting blocks are evenly spaced around the outer peripheral wall of the valve core, and a limiting groove is formed on the inner peripheral wall of the valve body, with the limiting blocks correspondingly embedded in each of the limiting grooves.

[0016] The present invention also discloses a drainage device, comprising: Drainage tubes used to establish drainage pathways; A container storing drainage fluid that is connected to the drainage tube; And a medical three-way rotary valve connected in the path of the drainage tube for controlling the on / off and flow direction switching of the drainage fluid; The medical three-way rotary valve is a medical three-way rotary valve with continuous interface pressure as described in any of the preceding claims. The drainage tube includes at least one input tube connected to the inlet of the medical three-way rotary valve, and at least one output tube connected to the outlet of the medical three-way rotary valve.

[0017] The beneficial effects of this invention are mainly reflected in the following: This invention proposes a matching interface method for the valve body and valve core, introducing a continuous, controllable, and posture-independent normal pressure between the two. This continuous pressure, combined with the integral conical contact interface, can actively compensate for the increase in the micro gap of the interface caused by temperature fluctuations, material creep, or slight wear, and can also ensure that the valve core and valve body always maintain a tight contact state at any angle, thereby improving the overall sealing durability and anti-leakage capability of the medical three-way rotary valve.

[0018] Compared with existing technologies, this invention not only effectively avoids the reliability decline caused by the aging of the sealing ring, but also overcomes the problems of excessive dependence on gravity direction and excessive wear in local taper fit, providing a safer, longer-lasting and more adaptable solution for medical drainage devices in complex clinical settings. Attached Figure Description

[0019] The technical solution of the present invention will be further described below with reference to the accompanying drawings: Figure 1 : A three-dimensional schematic diagram of a preferred embodiment of the present invention; Figure 2 : An exploded view of a preferred embodiment of the present invention; Figure 3 : Front view of a preferred embodiment of the present invention; Figure 4 Left view of a preferred embodiment of the present invention; Figure 5 Top view of a preferred embodiment of the present invention; Figure 6 : Figure 3 Sectional view along the middle AA; Figure 7 : A three-dimensional schematic diagram of the second embodiment of the present invention; Figure 8 : Explosion diagram of the second embodiment of the present invention; Figure 9 : A three-dimensional schematic diagram of the third embodiment of the present invention; Figure 10 : Explosion diagram of the third embodiment of the present invention. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the specific embodiments shown in the accompanying drawings. However, these embodiments are not limited to the present invention, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of the present invention.

[0021] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Also, in the description of the solution, with the operator as a reference, the direction closer to the operator is the proximal end, and the direction farther from the operator is the distal end.

[0022] This invention discloses a medical three-way rotary valve 100. For example... Figures 1 to 6 In the preferred embodiment shown, the medical three-way rotary valve 100 mainly includes a valve body 1, a valve core 2, a knob 3, and a valve seat 4. The valve body 1 has an overall hollow cylindrical structure, and its main body 10 is roughly a cylindrical shell with an internal cavity for accommodating the valve core 2.

[0023] The main body 10 has a first inlet 11, a second inlet 12, and an outlet 13 extending radially outward on its side wall, all of which are connected to the internal cavity of the main body 10. Preferably, the first inlet 11 and the second inlet 12 are arranged at intervals along the circumference of the main body 10 (for example, at a 90° angle), while the outlet 13 is arranged on the opposite side of the main body 10 to the first inlet 11.

[0024] The outer peripheral walls of the first inlet 11, the second inlet 12, and the outlet 13 are preferably provided with threads or locking structures to facilitate detachable and sealed connection with external pipelines (such as drainage tubes or infusion tubes). In this embodiment, end caps 6 are threadedly connected to the first inlet 11 and the second inlet 12 respectively to seal the inlet in the non-use state to prevent contamination; the outlet 13 is connected with a rotary lock 7 and a protective cap 8. The rotary lock 7 is used to achieve a quick locking connection with external pipelines, and the protective cap 8 provides protection for the outlet 13 during transportation and storage.

[0025] Please continue reading. Figure 2 and combined Figure 6 The cross-sectional view shows that the valve core 2 is axially rotatably inserted into the main body 10 of the valve body 1. The valve core 2 is generally a truncated cone (i.e., frustum-shaped) columnar structure, with a liquid channel 20 inside. The liquid channel 20 is arranged radially through the valve core 2 and is used to selectively connect the first inlet 11 and / or the second inlet 12 to the outlet 13 when the valve core 2 is rotated to a specific angle.

[0026] Specifically, the liquid channel 20 inside the valve core 2 can be arranged in an L-shape or a T-shape to achieve different path switching modes. When the valve core 2 rotates to one working position, the two ends of the liquid channel 20 are aligned with the first inlet 11 and the outlet 13, respectively, thereby connecting the first inlet 11 and the outlet 13; when the valve core 2 rotates to another working position, the two ends of the liquid channel 20 are aligned with the second inlet 12 and the outlet 13, respectively, thereby connecting the second inlet 12 and the outlet 13; when the valve core 2 rotates to the middle position, the liquid channel 20 is not aligned with any of the inlets, thereby achieving complete shut-off.

[0027] The axial tip of the valve core 2 extends beyond the upper surface of the valve body 1 and is fixedly connected to the knob 3. The knob 3 is generally disc-shaped or handle-shaped, and its outer peripheral wall is preferably provided with anti-slip texture to facilitate the operator's grip. The knob 3 is used to drive the valve core 2 to rotate relative to the valve body 1 around its own axis under external force, thereby selectively opening or closing the fluid (medicinal liquid) passage 20 through the rotation of the valve core 2. The fixed connection between the knob 3 and the valve core 2 can be achieved by key connection, D-shaped shaft hole fit, spline connection, or integral molding, etc., to ensure effective torque transmission.

[0028] As one of the core technical improvements of this invention, the inner peripheral wall of the main body 10 of the valve body 1 is configured as an inner conical surface 14, that is, the inner cavity of the main body 10 has a conical hole structure in the axial direction, and its diameter gradually decreases from the end closer to the knob 3 (large end) to the end farther away from the knob 3 (small end). Correspondingly, the overall outer peripheral wall of the valve core 2 is configured as an outer conical surface 21 that slides tightly with the inner conical surface 14 in both the axial and circumferential directions, that is, the outer contour of the valve core 2 is a truncated cone with the same taper as the inner conical surface 14. The axial small end (i.e., the end with the smaller diameter) of the valve core 2 points towards the inner bottom end of the main body 10 (i.e., away from the knob 3). The taper of the conical surface is preferably 3° to 5°. This taper range can ensure the self-locking characteristics of the conical surface while ensuring that the valve core 2 can rotate and slide smoothly in the valve body 1 without jamming. The inner conical surface 14 and the outer conical surface 21 cooperate to achieve surface contact sealing between the valve core 2 and the valve body 1. Compared with the traditional cylindrical surface fit plus O-ring seal, the conical surface fit has a larger contact area and a more uniform contact pressure distribution.

[0029] Please see Figures 3 to 6 A valve seat 4 is detachably fitted and fixedly connected to the valve body 1 on the side away from the knob 3 in the axial direction (i.e., the bottom end side). The valve seat 4 is cup-shaped or cap-shaped, and the axial free end (i.e., the small end) of the valve core 2 extends axially out of the bottom end of the valve body 1 and is fixed to the valve seat 4.

[0030] In this invention, the axial free end of the valve core 2 is integrally formed with multiple circumferentially distributed petal-shaped elastic snaps 23 (preferably 2 to 4, evenly arranged circumferentially), each petal-shaped elastic snap 23 having a certain elastic deformation capacity in the radial direction. The outer end face of the valve seat 4 (i.e., the end face away from the valve body 1) is provided with a snap-fit ​​groove 42 corresponding to the petal-shaped elastic snaps 23. During assembly, the axial free end of the valve core 2 is inserted into the corresponding hole of the valve seat 4. The petal-shaped elastic snaps 23 first undergo radial compression and elastic deformation. After insertion, the petal-shaped elastic snaps 23 expand radially outward under their own elastic restoring force, thereby engaging with the snap-fit ​​groove 42, achieving an axial fixed connection between the valve core 2 and the valve seat 4, and forming a stable linkage between the valve core 2 and the valve seat 4. This assembly method of petal-shaped elastic snaps requires no additional fasteners, is simple and quick to assemble, and is suitable for mass production.

[0031] Please refer to this carefully. Figure 6 According to the cross-sectional view, the medical three-way rotary valve 100 also includes a force-applying mechanism for applying axial bias pressure to the valve core 2. As one of the core technical improvements of the present invention, in this embodiment, the force-applying mechanism is an elastic element 5 disposed between the axial bottom end face of the valve seat 4 and the valve body 1. The elastic element 5 is axially compressed and abuts against the valve seat 4 and the valve body 1, that is, one end of the elastic element 5 abuts against the bottom end face of the valve body 1, and the other end abuts against the inner end face of the valve seat 4. The elastic element 5 uses its own elastic restoring force to continuously apply axial thrust (i.e., the continuous force) to the valve seat 4, thereby causing the valve core 2 to always have a displacement tendency toward its small end direction (i.e., away from the knob 3) through the valve seat 4. This continuous force makes the outer conical surface 21 and the inner conical surface 14 always maintain a tight conical contact state, and continuously generate an interface pressing force at the interface between the two to prevent leakage of the drug solution.

[0032] The elastic element 5 can be selected from any of the following elastic elements: a metal elastic washer (such as a wave spring washer, a disc spring washer), a linear helical spring, or elastic rubber (such as an O-ring, a rubber washer). Preferably, the elastic element 5 can be the wave spring washer of this preferred embodiment, or it can be the linear helical spring of the second embodiment. Figure 7 and Figure 8As shown, the linear helical spring is sleeved outside the axial free end of the valve core 2 and located between the bottom end face of the valve body 1 and the inner end face of the valve seat 4. The linear helical spring has the advantages of low cost, stable elastic coefficient, and long service life. In the assembled state, the linear helical spring is compressed to a certain pre-compression amount, thereby generating a preset elastic restoring force. The magnitude of this restoring force can be precisely controlled by selecting appropriate spring parameters (such as wire diameter, mean diameter, and effective number of turns) according to the valve size, the taper of the conical surface, and the required sealing pressure. Preferably, the magnitude of this elastic restoring force is set to be sufficient to overcome the axial separation force generated by the weight of the valve core 2 itself and the swaying of the pipeline, while not being too large, which would cause excessive resistance when the valve core 2 rotates, affecting the operating feel.

[0033] Please continue reading. Figure 2 and Figure 6 The valve seat 4 has at least one groove 41 (preferably two symmetrically arranged grooves 41) on one end face facing the valve body 1. The outer edge of the axial bottom end of the valve body 1 has a protrusion 15 corresponding to the position of the groove 41. When the valve seat 4 is fitted onto the bottom end of the valve body 1, the protrusion 15 is engaged within the groove 41, thus forming a circumferential limiting fit structure. The function of this limiting fit structure is that during the rotation of the valve core 2, since the valve core 2 and the valve seat 4 are fixedly connected by a flap-type elastic snap 23, the valve seat 4 tends to rotate with the valve core 2. However, through the engagement and limiting of the protrusion 15 and the groove 41, the valve seat 4 is restricted from circumferential rotation relative to the valve body 1, thereby ensuring that the valve seat 4 is only used as an axial support for the elastic element 5 and will not rotate with the valve core 2, thus avoiding the failure of the elastic element 5 due to the rotation of the valve seat 4.

[0034] Multiple limiting blocks 22 are evenly spaced around the outer peripheral wall of the valve core 2. A limiting groove 16 is formed on the inner peripheral wall of the valve body 1, and the limiting blocks 22 are correspondingly embedded in each of the limiting grooves 16. The limiting groove 16 is formed in the recess between two protrusions. The cooperation between the limiting blocks 22 and the limiting grooves 16 not only restricts the axial movement and excessive circumferential rotation of the valve core 2 relative to the valve body 1, but also provides the operator with a clear gear shifting prompt by producing a jerky feel or sound when the limiting blocks 22 touch the sidewall of the limiting groove 16 during rotation.

[0035] Please see Figure 9 and Figure 10 The third embodiment of the present invention is shown. This embodiment has a basically the same overall structure as the preferred embodiment, the main difference being the specific form and arrangement of the elastic element 5.

[0036] In this embodiment, the elastic element 5 is disposed between the knob 3 and the valve body 1. A flange 17 is fixedly disposed at the upper end of the valve body 1, which can be ultrasonically welded. A limiting element 31 is fixed inside the knob 3, which can be bonded. The limiting element 31 has an abutment portion 32. The elastic element 5 is a linear helical spring, with its two ends abutting against the flange 17 and the abutment portion 32, respectively. Thus, the elastic element 5 is axially compressed and abuts against the knob 3 and the valve body 1. The elastic element 5 continuously applies the continuous force to the knob 3 using its own elastic restoring force, thereby causing the valve core 2 to consistently exhibit a displacement tendency towards its smaller end through the knob 3.

[0037] Furthermore, in this embodiment, the axial free end of the valve core 2 is also provided with a flap-type elastic buckle 23, and the valve seat 4 is provided with a snap-fit ​​groove 42. The valve core 2 is fixedly connected to the valve seat 4 by the snap-fit ​​of the flap-type elastic buckle 23 and the snap-fit ​​groove 42. The anti-rotation structure (groove 41 and protrusion 15) between the valve seat 4 and the valve body 1 is the same as in the preferred embodiment, and will not be described again here.

[0038] The present invention also discloses a drainage device comprising a medical three-way rotary valve 100 with continuous interface pressure as described in any of the foregoing embodiments.

[0039] Specifically, the drainage device includes: a drainage tube for establishing a drainage path, a container (such as a drainage bag or drainage bottle) connected to the drainage tube for storing drainage fluid, and a medical three-way valve 100 connected in the path of the drainage tube for controlling the on / off state and flow direction switching of the drainage fluid. The medical three-way valve 100 is a medical three-way valve with continuous interface pressure as described in any of the preceding embodiments. The drainage tube includes at least one input tube connected to the inlet (i.e., the first inlet 11 and / or the second inlet 12) of the medical three-way valve 100, and at least one output tube connected to the outlet 13 of the medical three-way valve 100.

[0040] Because of the use of a medical three-way rotary valve 100 with continuous interface pressure, the drainage device maintains close contact with the outer conical surface 21 of the valve core 2 and the inner conical surface 14 of the valve body 1 under the continuous force provided by the elastic element 5, regardless of the placement of the drainage device (vertically suspended, horizontally placed, or tilted). This ensures the sealing reliability of the drainage device during long-term use and effectively avoids medical risks such as leakage, contamination, or infection of drainage fluid due to sealing failure.

[0041] Of course, the medical three-way rotary valve 100 of the present invention can also be used in other types of drainage devices, such as ventricular drainage devices, thoracic drainage devices, abdominal drainage devices, biliary drainage devices, bladder irrigation and drainage devices, intestinal irrigation and drainage devices, etc., which will not be listed here.

[0042] The following description, in conjunction with the structural features of the present invention, explains the beneficial effects of the invention. The valve core 2 of the present invention features a design where the entire outer circumferential surface is conical. Combined with an elastic element 5 that continuously applies axial biasing pressure to the valve core 2, a continuous force is provided that causes the valve core to tend to displace along its own axial direction towards its smaller end. This continuous force ensures that the outer conical surface and the inner conical surface maintain a tight conical contact at all times, and continuously generates an interfacial clamping force at their mating interface to prevent leakage of the liquid medicine.

[0043] The full-conical surface design of this invention ensures that the entire mating surface participates in the sealing process, more effectively preventing liquid leakage and avoiding the premature wear caused by excessive local pressure on the partially conical surface in existing technologies. More importantly, under continuous axial pressure, even if the conical surface experiences slight wear due to long-term use, the valve core will move slightly under continuous pressure, automatically closing the gaps caused by wear, thus maintaining sealing performance for a long time. Furthermore, the full-conical surface design also guides the valve core to automatically and accurately align with the valve body center, ensuring that the two are always coaxial, resulting in smoother valve core rotation.

[0044] Compared with existing technologies, this invention not only effectively avoids the reliability decline caused by the aging of the sealing ring, but also overcomes the problems of excessive dependence on the direction of gravity and excessive wear in local taper fit, providing a safer, longer-lasting and more adaptable to complex clinical placement postures for medical drainage devices.

[0045] It should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. All equivalent embodiments or modifications made without departing from the spirit of the present invention should be included within the scope of protection of the present invention.

Claims

1. A medical three-way rotary valve with continuous interfacial pressure, comprising: A valve body (1) has a hollow cylindrical structure, and a first inlet (11), a second inlet (12) and an outlet (13) are radially connected on the side wall of the body (10). A valve core (2) is rotatably inserted into the body (10) of the valve body (1), and the valve core (2) has a liquid channel (20) for selective flow of liquid medicine. A knob (3) is fixedly installed at the axial top of the valve core (2) and located above the valve body (1). The knob (3) is used to drive the valve core (2) to rotate relative to the valve body (1) around its own axis by external force, so that the fluid passage (20) can selectively open or close the fluid passage between the first inlet (11) and / or the second inlet (12) and the outlet (13) through the rotation of the valve core (2). Its features are, The inner peripheral wall of the main body (10) of the valve body (1) is configured as an inner conical surface (14), and the outer peripheral wall of the valve core (2) is configured as an outer conical surface (21) that is in close sliding fit with the inner conical surface (14) in both the axial and circumferential directions, and the axial small end of the valve core (2) points to the inner bottom end of the main body (10). The medical three-way rotary valve also includes a force-applying mechanism for applying axial bias pressure to the valve core (2). The force-applying mechanism always provides the valve core (2) with a continuous force that causes it to displace along its own axis toward its small end. The continuous force ensures that the outer conical surface (21) and the inner conical surface (14) always maintain a tight conical surface contact state, and continuously generates an interface pressing force at the interface between the two to prevent leakage of the drug solution.

2. The medical three-way rotary valve with continuous interface pressure according to claim 1, characterized in that, A valve seat (4) is detachably fitted and fixedly connected to the valve body (1) on the other end away from the knob (3) in the axial direction. The axial free end of the valve core (2) extends out of the bottom end of the valve body (1) in the axial direction and is fixed to the valve seat (4).

3. The medical three-way rotary valve with continuous interface pressure according to claim 2, characterized in that, The valve core (2) is integrally formed with multiple circumferentially distributed petal-type elastic buckles (23) at its axial free end. The valve seat (4) has a snap-fit ​​groove (42) corresponding to the petal-type elastic buckle on its outer end face. The valve core (2) is axially fixedly connected to the valve seat (4) by the radial expansion snap-fit ​​of the petal-type elastic buckle and the snap-fit ​​groove, so as to realize the stable linkage between the valve core (2) and the valve seat (4).

4. The medical three-way rotary valve with continuous interface pressure according to any one of claims 1-3, characterized in that, The force-applying mechanism is an elastic element (5) disposed between the bottom axial end face of the valve seat (4) and the valve body (1). The elastic element (5) is axially compressed and abuts against the valve seat (4) and the valve body (1). The elastic element (5) continuously applies the continuous force to the valve seat (4) using its own elastic restoring force, thereby driving the valve core (2) to always generate a displacement tendency towards its small end through the valve seat (4).

5. The medical three-way rotary valve with continuous interface pressure according to claim 4, characterized in that, The elastic element (5) is selected from any of the following elastic elements: metal elastic gasket, linear helical spring or elastic rubber.

6. The medical three-way rotary valve with continuous interface pressure according to any one of claims 1-3, characterized in that, The force-applying mechanism is an elastic element (5) disposed between the knob (3) and the valve body (1). The elastic element (5) is axially compressed and abuts against the knob (3) and the valve body (1). The elastic element (5) uses its own elastic restoring force to continuously apply the continuous force to the knob (3), thereby driving the valve core (2) to always generate a displacement tendency towards its small end through the knob (3).

7. The medical three-way rotary valve with continuous interface pressure according to claim 6, characterized in that, The valve body (1) has a flange (17), a limiting member (31) is fixed inside the knob (3), the limiting member has an abutment part (32), and the elastic member (5) is a linear helical spring with its two ends abutting against the flange (17) and the abutment part (32) respectively.

8. The medical three-way rotary valve with continuous interface pressure according to claim 2 or 3, characterized in that, The valve seat (4) has at least one groove (41) on one end face facing the valve body (1). The outer edge of the bottom axial end of the valve body (1) is provided with a protrusion (15) corresponding to the position of the groove (41). The protrusion (15) is fitted into the groove (41) to form a limiting fit structure in the circumferential direction, so as to prevent the valve seat (4) from rotating circumferentially relative to the valve body (1) during the rotation of the valve core (2).

9. The medical three-way rotary valve with continuous interface pressure according to claim 8, characterized in that, The valve core (2) has multiple limiting blocks (22) evenly spaced around its outer peripheral wall. The valve body (1) has a limiting groove (16) on its inner peripheral wall. The limiting blocks (22) are correspondingly embedded in each of the limiting grooves (16).

10. A drainage device, characterized in that, include Drainage tubes used to establish drainage pathways; A container storing drainage fluid that is connected to the drainage tube; And a medical three-way rotary valve connected in the path of the drainage tube for controlling the on / off and flow direction switching of the drainage fluid; The medical three-way rotary valve is a medical three-way rotary valve with continuous interface pressure as described in any one of claims 1 to 9; The drainage tube includes at least one input tube connected to the inlet of the medical three-way rotary valve, and at least one output tube connected to the outlet of the medical three-way rotary valve.

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