Pressure control valve for use in blood systems and pressure regulation method thereof

Abstract

A pressure control valve and a pressure adjustment method thereof that quickly and safely lowers blood pressure. The pressure control valve includes a valve body 1, a valve cap 6, a valve core, a sealing device, and a driving device, the valve cap 6 is connected to the side wall of the valve body 1, the valve core, the sealing device, and the driving device are provided at the point where the valve cap 6 and the valve body 1 are connected, the lower surface of the valve cap is connected to the side wall of the valve body, the upper surface of the valve cap 6 has a screw hole for a bolt 7 to pass through, the bolt 7 passes through the screw hole and is connected to a groove in the side wall of the valve body, the upper surface of the valve cap 6 is further provided with a driving space for mounting the driving device, and a cover plate 10 is provided above the driving space, and both sides of the cover plate 10 are respectively connected to the valve cap 6 through cylindrical pins. The valve is controlled to discharge excess blood in the bloodstream, thereby controlling the blood flow.

Description

[Technical field]

[0001] The present invention relates to the technical field of valves, and more particularly to a pressure control valve for use in a blood system and a pressure regulation method thereof. [Background technology]

[0002] Hypertension is a chronic disease, and it is very difficult to completely cure hypertension. At present, the general clinical treatment is to use antihypertensive drugs for a long time to control blood pressure within the normal range and effectively prevent hypertension complications. Therefore, the diagnosis and treatment of hypertension require long-term drug therapy.

[0003] Currently, the mainstream method of lowering blood pressure is to use drugs to lower blood pressure. However, it takes time for the drugs to take effect, and in an emergency, this time is the main cause of death for the patient. Simply put, the process of lowering blood pressure with drugs is as follows: Blood pressure rises → patient becomes aware → medication is used → blood pressure drops.

[0004] After blood pressure rises, there is a delay in lowering blood pressure due to delayed patient awareness, delayed drug administration, and delayed drug action. For example, the antihypertensive drugs nitroglycerin or sodium nitroprusside typically take about 15-30 minutes to take effect after oral administration (even longer if you factor in perception and drug administration delays). If we could eliminate these delays and somehow lower blood pressure as soon as it rises, countless lives could be saved.

[0005] Compared with lowering blood pressure by drugs using biological pathways, lowering blood pressure by physical pathways is more rapid. The principle of lowering blood pressure by bloodletting is to achieve the purpose of lowering blood pressure by reducing blood volume in a situation where the volume of the human blood vessels does not change. Such lowering blood pressure by physical pathways is almost only used in emergency situations in the operating room, and the related equipment is relatively complicated and not suitable for daily blood pressure reduction. Therefore, the technology of lowering blood pressure by conventional physical means is currently almost blank, and there is an urgent need to research a device that can quickly lower blood pressure by physical means. Summary of the Invention

[0006] In response to the shortcomings of the prior art, the present invention provides a pressure control valve for use in blood circulation system and its pressure regulation method. Through the cooperation of the valve core, the wave spring and the motor, the valve core compresses the wave spring to realize the movement between the valve body and the valve cap, so that the liquid inside the valve body is discharged out by the valve core, and finally the liquid pressure inside the valve body always remains stable. This pneumatic valve can reduce blood pressure by the way of physical pressure reduction, and is suitable for use in various scenarios, is simple and convenient to operate, and can achieve the purpose of reducing blood pressure quickly and safely.

[0007] In order to achieve the above object, the present invention discloses the following technical means. The valve body includes a valve cap, a valve core, a sealing device, and a driving device, the valve cap being connected to a side wall of the valve body, and the valve core, the sealing device, and the driving device being provided at a location where the valve cap and the valve body are connected, The valve body has a hollow column structure, and a through hole is formed in a side wall of the valve body, and a groove having a screw structure is formed in the side wall of the valve body on both sides of the through hole; The lower surface of the valve cap is connected to a side wall of the valve body, the upper surface of the valve cap is provided with a screw hole for a bolt to pass through, and the bolt passes through the screw hole and is connected to a groove in the side wall of the valve body, the upper surface of the valve cap is further provided with a driving space for mounting the driving device, and a cover plate is provided above the driving space, and both sides of the cover plate are connected to the valve cap via cylindrical pins, A drain passage is provided at a portion where the valve cap and the valve body are connected, The driving device includes a motor, a power source, a rotating shaft, a wave spring, and a slider, and the power source, motor, rotating shaft, slider, wave spring, and valve core are provided in this order below the cover plate, and an output end of the power source is connected to an input end of the motor, an output end of the motor is connected to a first end of the rotating shaft, a second end of the rotating shaft is fixedly connected to a first end of the slider, a first end of the wave spring contacts a second end of the slider, and a second end of the wave spring contacts a first end of the valve core, a first end of the valve core is provided with a spring space for the wave spring to operate; an extension structure is provided on an outer wall of the valve core midway, the extension structure prevents the valve core from sliding into the valve body; a second end of the valve core is hollow, and a plurality of fluid passage grooves are provided on the side wall of the second end of the valve core.

[0008] Optionally, a sensor is further provided on a side wall of the valve body, the sensor being connected to a center console by a wireless device, and the center console remotely controls the rotation of the motor by the wireless device.

[0009] Alternatively, when the liquid pressure in the valve body is at a normal value, the intermediate extension portion of the valve core is in close contact with the through hole of the valve body, the wave spring is in an extended state, and the drain passage does not communicate with the valve body; when the liquid pressure in the valve body is at a high value, the liquid pushes the valve core, and the valve core presses the wave spring, so that the intermediate extension portion of the valve core is separated from the through hole of the valve body, and the outflowing liquid flows through the valve core and then out of the drain passage.

[0010] Optionally, the sealing device is a seal ring.

[0011] The present invention further provides a method for adjusting pressure of a pressure control valve used in a blood system, comprising the steps of: S1: Liquid is injected into the inside of the valve body, and the internal pressure of the liquid is detected by the sensor and recorded as the initial pressure, and the middle of the valve core is in tight contact with the through hole of the valve body 1, and the wave spring does not change. S2: The liquid pressure in the valve body begins to increase, causing the valve core to move upward and the wave spring to begin to compress, which forces the liquid out of the drain passage. S3: After the sensor detects that the liquid pressure in the valve body has returned to normal, the center console controls the rotation of the motor to drive the rotating shaft, pushing the wave spring and its valve core, so that the extension of the valve core in the middle is brought into close contact with the through hole in the side wall of the valve body and returns to the initial state. The motor speed is N:

number

number

[0012] Optionally, in S2, the amount of liquid discharged from the passage is ΔV:

number

[0013] Compared with the prior art, the present invention has the following beneficial effects: (1) In the present invention, through the cooperation of the valve body, valve cap, valve core, sealing device and driving device, the usable valve core can realize the up and down movement between the valve body and the valve cap by pressing or releasing the wave spring, and finally can operate immediately when the symptoms of high blood pressure appear, thereby lowering blood pressure as soon as possible and achieving the effect of lowering blood pressure quickly and safely.

[0014] (2) The present invention can accurately adjust the blood pressure value by accurately checking the operation time of the valve core through the pressure adjustment method. The device can also be remotely adjusted, and different schemes can be set up according to different users or different times of users to meet the precise blood pressure reduction needs of different stages.

[0015] (3) By providing a valve body, valve cap, valve core, sealing device and drive mechanism, the present invention prevents the user from developing drug resistance and losing the effectiveness of the drug, and can lower blood pressure effectively and safely for a long period of time. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a schematic diagram of the overall structure of a pressure control valve used in the blood system of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of a pressure control valve for use in the blood system of the present invention. [Diagram 3] FIG. 2 is a cross-sectional perspective view of a pressure control valve for use in the blood system of the present invention. [Figure 4] FIG. 2 is a schematic diagram of a valve core structure of a pressure control valve used in the blood system of the present invention. [Diagram 5] 5a-5b are diagrams showing blood vessels in Example 1 of the present invention.

[0017] Explanation of symbols 1-valve body; 2-blood pressure sensor; 3-sensor O-type sealing ring; 4-O-type sealing ring; 5-C-type sealing ring; 6-valve cap; 7-bolt; 8-rectangular sealing ring; 9-cylindrical pin; 10-cover plate; 11-motor; 12-rotating shaft; 13-slider; 14-wave spring; 15-valve core; 16-fluid passage groove; 17-extension structure; 18-spring space. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Exemplary embodiments, features, and aspects of the present invention are described in detail below with reference to the drawings, in which like reference numbers identify functionally identical or similar elements. While various aspects of the embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

[0019] The present invention provides a pressure control valve for use in a blood system, which can be placed directly into a blood vessel in the human body in the same manner as other medical surgical devices are placed into the human body.

[0020] As shown in Figures 1-4, the pressure control valve used in the blood system includes a valve body 1, a valve cap 6, a valve core 15, a sealing device, and a driving device, and the valve cap 6 is connected to the side wall of the valve body 1, and the valve core 15, the sealing device, and the driving device are provided at the point where the valve cap 6 and the valve body 1 are connected.

[0021] The valve body 1 has a hollow column structure, and a through hole is provided on the side wall of the valve body 1. A groove having a screw structure is provided on the side wall of the valve body 1 on both sides of the through hole.

[0022] The lower surface of the valve cap 6 is connected to the side wall of the valve body 1, and the upper surface of the valve cap 6 is provided with a screw hole for a bolt to pass through. The bolt passes through the screw hole and is connected to a groove in the side wall of the valve body 1. A driving space for mounting a driving device is further provided on the upper surface of the valve cap 6. A cover plate is provided above the driving space. Both sides of the cover plate are connected to the valve cap 6 via cylindrical pins.

[0023] A drain passage is provided at the connection point between the valve cap 6 and the valve body 1. The drain pipe is for discharging excess liquid when the liquid pressure is high, thereby reducing the liquid pressure.

[0024] The driving device includes a motor 11, a power supply, a rotating shaft 12, a wave spring 14, and a slider 13. A power supply, motor 11, rotating shaft 12, slider 13, wave spring 14, and valve core 15 are provided below the cover plate in this order, and an output end of the power supply is connected to an input end of the motor 11, an output end of the motor 11 is connected to a first end of the rotating shaft 12, a second end of the rotating shaft 12 is fixedly connected to a first end of the slider 13, a first end of the wave spring 14 contacts a second end of the slider 13, and a second end of the wave spring 14 contacts a first end of the valve core 15.

[0025] The power source can be charged wirelessly, a charging port can be directly secured on the outside of the human body, or the power source can be replaced by surgery.

[0026] A spring space 18 is provided at a first end of the valve core 15 for the operation of the wave spring 14. An extension structure 17 is provided on the outer wall of the valve core 15 at a midpoint. The extension structure 17 prevents the valve core 15 from slipping inside the valve body 1. A second end of the valve core 15 has a hollow structure, and a plurality of fluid passage grooves 16 are provided on the side wall of the second end of the valve core 15.

[0027] A blood pressure sensor 2 is further provided on the side wall of the valve body 1. The sensor is connected to a center console by a wireless device, and the center console remotely controls the rotation of the motor 11 by the wireless device.

[0028] When the liquid pressure inside the valve body 1 is normal, the midway extension part of the valve core 15 is in close contact with the through hole of the valve body 1, the wave spring 14 is in an extended state, and the drain passage does not communicate with the inside of the valve body 1. When the liquid pressure inside the valve body 1 is high, the liquid pushes the valve core 15, which in turn pushes the wave spring 14, causing the midway extension part of the valve core 15 to separate from the through hole of the valve body 1, and the outflowing liquid flows out of the drain passage after passing through the valve core 15.

[0029] The sealing device is a seal ring. The seal ring may be a C-type seal ring or an O-type seal ring, and may be appropriately selected according to the needs.

[0030] The present invention further provides a method for adjusting pressure of a pressure control valve for use in a blood system, the method comprising the steps of:

[0031] S1: Liquid is injected into the inside of the valve body 1, and the internal pressure of the liquid is detected by the sensor and recorded as the initial pressure, and the middle of the valve core 15 is in tight contact with the through hole of the valve body 1, and the wave spring 14 does not change.

[0032] S2: The liquid pressure inside the valve body 1 begins to increase, the valve core 15 moves upward, and the wave spring 14 begins to compress, causing the liquid to be discharged through the drain passage.

[0033] S3: After the sensor detects that the liquid pressure inside the valve body 1 has returned to normal, the center console controls the rotation of the motor 11 to drive the rotating shaft 12, pushing and moving the wave spring 14 and its valve core 15, so that the intermediate extension of the valve core 15 comes into close contact with the through hole in the side wall of the valve body 1 and returns to the initial state. To adjust the valve opening pressure from the initial state (maximum mounting space) to a state where p0 is reached (mounting space is h0), it is necessary to check the rotation speed of the motor 11. The rotation speed of the motor 11 is N:

number

[0034] The rotation time of the motor 11 is t:

number

[0035] At S2, the amount of liquid discharged from the passage is ΔV:

number

[0036] Working Example The pressure control valve of the present invention is introduced into the blood circulatory system of the human body; specifically, a blood vessel is cut, and one end of the cut part is connected to the inlet of the valve body 1 and the other end is connected to the outlet of the valve body 1, so that blood flows into the pressure control valve of the present invention from the inlet of the valve body 1 and flows out of the pressure control valve of the present invention from the outlet of the valve body 1.

[0037] The blood in the valve body 1 fills a cavity formed by the valve body 1, the O-type seal ring 4, the blood pressure sensor 2, the sensor O-type seal ring 3, and the valve core 15. Because the blood has pressure, the lower end of the valve core 15 is subjected to a force.

[0038] At the upper end of the valve core 15, the distance between the lower end of the slider 13 and the upper end of the valve core 15 can be adjusted by the rotation of the motor 11 and the screw joint formed by the rotating shaft 12 and the slider 13. Since the wave spring 14 is located between the rotating shaft 12 and the valve core 15, the wave spring 14 is compressed or restored by the rotation of the motor 11, thereby realizing the adjustment of the biasing force of the wave spring 14.

[0039] Because the wave spring 14 has a biasing force, a force is applied to the upper end of the valve core 15. As a result, the valve core 15 is kept in balance under the action of the force acting on the upper end, the force acting on the lower end, and the supporting force of the O-type seal ring 4.

[0040] If the blood pressure is not strong enough, the force acting on the lower end is not strong enough to overcome the force acting on the upper end and release the seal between the valve core 15 and the O-seal ring 4 .

[0041] When the pressure of the blood is large enough, the force acting on the lower end becomes large enough to overcome the force acting on the upper end and release the seal of the valve core 15 and the O-type seal ring 4. Thus, the blood enters the cavity formed by the valve body 1, the valve cap 6, the O-type seal ring 4, the C-type seal ring 5, the blood pressure sensor 2, and the rectangular seal ring. At this time, the amount of blood in the blood system of the human body decreases, but the volume of the blood system of the human body does not change, so the blood pressure decreases. When the blood pressure drops to a certain value, the force acting on the lower end cannot overcome the force acting on the upper end, so the seal of the valve core 15 and the O-type seal ring 4 cannot be released, and the blood does not overflow. The blood overflowing into the cavity formed by the valve body 1, the valve cap 6, the O-type seal ring 4, the C-type seal ring 5, the blood pressure sensor 2, and the rectangular seal ring can be discharged from the O-type blood drainage port formed by the valve cap 6 and the valve body 1.

[0042] The blood pressure sensor 2 can measure the blood pressure at the corresponding position through the device at its lower end, and can transmit the blood pressure value to the corresponding equipment.

[0043] The amount of discharged blood in the present invention can be roughly calculated by the following method. As shown in FIG. 5, FIG. 5a is a blood vessel model, and FIG. 5b is a diagram of the state in which the blood vessel wall is subjected to force. Here, L is the total length of the human body blood vessel, t is the average thickness of the human body blood vessel, d is the average diameter of the human body blood vessel, and E is the average elastic modulus of the human body blood vessel (the deformation of the blood vessel is within the elastic range and satisfies Hooke's law). When blood with a blood pressure of p flows through the blood vessel, the state of the force that the blood vessel wall is subjected to is shown in FIG. 5b. From the balance of forces in the vertical direction,

number

[0044] If we assume that the positive stress δ is uniformly distributed in the longitudinal section of the blood vessel wall,

number

[0045] If we combine the above two equations, we get

number

[0046] The strain ε is

number

[0047] The relationship between the change in circumference ΔC in the cross section of the inner wall of the blood vessel and the original circumference C is

number

[0048] Circumference of blood vessel wall at blood pressure p p teeth,

number

[0049] Diameter d of the blood vessel wall at blood pressure p p teeth,

number

[0050] The blood flow area S in a blood vessel at blood pressure p p teeth,

number

[0051] The volume of blood vessels at blood pressure p is Vp teeth,

number

[0052] If the bulk elasticity of blood is k, the volume V0 and V1 of blood in a blood vessel at blood pressure p when placed under atmospheric pressure are p The relationship is as follows:

number

[0053]

number

[0054] If the opening blood pressure set by a patient is p0 and the blood pressure increases by Δp based on p0, the amount of blood that the internal blood safety valve should discharge is:

number

[0055] The rotation speed and operating time of the motor 11 are specifically as follows: p0 is the valve opening pressure of the human blood system safety valve, k is the spring stiffness, L is the original length of the spring, d is the diameter of the valve core 15, P is the pitch for adjusting the valve opening pressure screw, H is the maximum mounting height of the spring space 18, and h is the minimum mounting height. Here, L>H>h, and the spring operates within its elastic range.

[0056] The minimum valve opening pressure is P 0min In this case, the mounting height of the spring space 18 is H. In this case, the balance of the force of the valve core 15 is as follows:

number

number

[0057] The maximum valve opening pressure is P 0max In this case, the installation height of the spring space 18 is h. In this case, from the balance of the force of the valve core 15,

number

number

[0058] From the above, the range of the valve opening pressure P0 is as follows:

number

[0059] Here, L, K, H, h, and d are all inherent parameters. When the basic structure of the valve is determined (i.e., H, h, and d are already determined), the range of the value of P0 can be adjusted by adjusting the spring parameters L and K. The method for determining L and K is as follows: 0min and P 0max is a known target value,

number

[0060] H, h, d are determined and P 0min and P 0max Since is a known quantity, L and K are

number

[0061] When the valve opening pressure value is P0, it is found from the balance of forces of the valve core 15 that h0 is the mounting height of the spring space 18 in this case.

number

[0062]

number

[0063] This means that the length ΔL that the spring needs to compress after installation is:

number

[0064] The required number of revolutions N of the motor 11 is

number

[0065] If the rotation speed of the motor 11 is n, the rotation time t of the motor 11 is given by:

number

[0066] In the formula for N and t, H, d, P, L, and K are characteristic parameters, and P0 is a known quantity as a target value, so N and t can be determined.

[0067] The above examples are intended to illustrate preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modifications and improvements made by those skilled in the art to the technical means of the present invention without departing from the spirit of the present invention should be included in the scope of protection specified in the claims of the present invention.

Claims

1. 1. A pressure control valve for use in a blood system, comprising: The valve body includes a valve cap, a valve core, a sealing device, and a driving device, the valve cap being connected to a side wall of the valve body, and the valve core, the sealing device, and the driving device being provided at a location where the valve cap and the valve body are connected, The valve body has a hollow column structure, and a through hole is formed in a side wall of the valve body, and a groove having a screw structure is formed in the side wall of the valve body on both sides of the through hole; The lower surface of the valve cap is connected to a side wall of the valve body, the upper surface of the valve cap is provided with a screw hole for a bolt to pass through, and the bolt passes through the screw hole and is connected to a groove in the side wall of the valve body, the upper surface of the valve cap is further provided with a driving space for mounting the driving device, and a cover plate is provided above the driving space, and both sides of the cover plate are connected to the valve cap via cylindrical pins, A drain passage is provided at a portion where the valve cap and the valve body are connected, The driving device includes a motor, a power source, a rotating shaft, a wave spring, and a slider, and the power source, motor, rotating shaft, slider, wave spring, and valve core are provided in this order below the cover plate, and an output end of the power source is connected to an input end of the motor, an output end of the motor is connected to a first end of the rotating shaft, a second end of the rotating shaft is fixedly connected to a first end of the slider, a first end of the wave spring contacts a second end of the slider, and a second end of the wave spring contacts a first end of the valve core, a first end of the valve core is provided with a spring space for the wave spring to operate; an extension structure is provided on an outer wall of the valve core midway, the extension structure preventing the valve core from sliding into the valve body; a second end of the valve core is hollow, and a plurality of fluid passage grooves are provided on a side wall of the second end of the valve core.

2. 2. The pressure control valve according to claim 1, further comprising a sensor on a side wall of the valve body, the sensor being connected to a center console by a wireless device, and the center console remotely controlling the rotation of the motor by the wireless device.

3. When the liquid pressure in the valve body is at a normal value, the intermediate extension portion of the valve core is in close contact with the through hole of the valve body, the wave spring is in an extended state, and the drain passage does not communicate with the valve body; 3. The pressure control valve according to claim 2, wherein when the liquid pressure in the valve body is high, the liquid pushes the valve core, and the valve core presses a wave spring, so that an intermediate extension portion of the valve core is separated from the through hole of the valve body, and the outflowing liquid flows through the valve core and then flows out through a drainage passage.

4. 2. The pressure control valve according to claim 1, wherein the sealing device is a seal ring.

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