Pressure control valve for blood system and pressure regulation method thereof

Abstract

To provide a pressure control valve to quickly and safely lower blood pressure and its pressure regulation method.SOLUTION: A 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 a side wall of the valve body 1, the valve core, the sealing device and the driving device are provided at a portion connecting the valve cap 6 and the valve body 1. A lower surface of the valve cap is connected to the side wall of the valve body, a threaded hole allowing a bolt 7 to penetrate therethrough is formed on an upper surface of the valve cap 6, the bolt 7 penetrates through the threaded hole to be connected to a recessed groove on the side wall of the valve body, a driving space allowing the driving device to be installed is further provided on the upper surface of the valve cap 6, and a lid plate 10 is arranged above the driving space. Both sides of the lid plate 10 are respectively connected to the valve cap 6 through cylindrical pins. Redundant blood in the blood is discharged by controlling the valve, so that the blood pressure is controlled.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly relates to a pressure control valve used in the blood system and a method for adjusting its pressure.

Background Art

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

[0003] Currently, as a method for lowering blood pressure, blood pressure reduction by drugs is the mainstream. However, it takes time for the drug to take effect, and in an emergency, this time is the main cause of taking the patient's life. Briefly speaking, the process of blood pressure reduction by drugs is as follows. Blood pressure rises → The patient becomes aware → Drugs are used → Blood pressure drops.

[0004] After blood pressure rises, due to the delay in patient awareness, the delay in drug administration, and the delay in the action of the drug, the reduction of blood pressure is delayed. For example, nitroglycerin or sodium nitroprusside, which are blood pressure lowering drugs, usually take about 15 to 30 minutes for the effect to appear after oral administration (the time becomes even longer when taking into account the perception delay and the drug administration delay). If these delays can be eliminated and blood pressure can be lowered by some means as soon as it rises, countless lives may be saved.

[0005] Compared with the blood pressure reduction by drugs using biological pathways, the blood pressure reduction by physical pathways is faster. The principle of blood pressure reduction by bloodletting is to achieve the purpose of blood pressure reduction by reducing the blood volume without changing the volume of human blood vessels. Such blood pressure reduction by physical pathways is only used almost exclusively in emergency situations in the operating room, and the related devices are relatively complex and not suitable for daily blood pressure reduction. Therefore, the technology of reducing blood pressure by conventional physical means is now almost blank, and the research on devices that can quickly reduce blood pressure by physical means is urgently needed.

Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a pressure control valve used in the blood system and its pressure regulation method. Through the cooperation of the valve core, wave spring and motor, the valve core compresses the wave spring to realize the movement between the valve body and the valve cap. As a result, the liquid inside the valve body is discharged outside by the valve core, and finally the liquid pressure inside the valve body always maintains a stable state. This pneumatic valve can reduce blood pressure by a physical blood pressure reduction method, is suitable for various scenario applications, is easy and convenient to operate, and can achieve the purpose of quickly and safely reducing blood pressure.

[0007] To achieve the above object, the present invention discloses the following technical means. It includes a valve body, a valve cap, a valve core, a sealing device and a driving device. The valve cap is connected to the side wall of the valve body, and the valve core, sealing device and driving device are provided at the connection position between the valve cap and the valve body. The valve body has a hollow column structure, and through holes are opened on the side wall of the valve body. Concave grooves with screw structures are opened on the side wall of the valve body on both sides of the through holes. The lower surface of the valve cap is connected to the side wall of the valve body. A screw hole for the bolt to pass through is formed on the upper surface of the valve cap. The bolt passes through the screw hole and is connected to a concave groove on the side wall of the valve body. A driving space for mounting the driving device is further provided on the upper surface of the valve cap. A cover plate is provided above the driving space. Both sides of the cover plate are connected to the valve cap via cylindrical pins respectively. A drain passage is provided at the connection between the valve cap and the valve body. The driving device includes a motor, a power source, a rotating shaft, a wave spring, and a slider. Below the cover plate, the power source, the motor, the rotating shaft, the slider, the wave spring, and the valve core are provided in sequence. The output end of the power source is connected to the input end of the motor. The output end of the motor is connected to the first end of the rotating shaft. The second end of the rotating shaft is fixedly connected to the first end of the slider. The first end of the wave spring contacts the second end of the slider. The second end of the wave spring contacts the first end of the valve core. A spring space for the wave spring to operate is provided at the first end of the valve core. An extension structure is provided on the outer side wall in the middle of the valve core. The extension structure prevents the valve core from sliding into the interior of the valve body. The second end of the valve core has a hollow structure, and a plurality of liquid passage grooves are formed on the side wall of the second end of the valve core. A pressure control valve for use in the blood system.

[0008] Optionally, a sensor is further provided on the side wall of the valve body. The sensor is 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] Optionally, when the liquid pressure in the valve body is at a normal value, the intermediate extension part of the valve core is in close contact with the through hole of the valve body, the wave spring is in a stretched state, the drain passage is not in communication with the valve body, and 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 part of the valve core separates from the through hole of the valve body, and the flowing-out liquid flows out from the drain passage after flowing through the valve core.

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

[0011] Further, the present invention further provides a pressure adjustment method for a pressure control valve used in a blood system. It includes the following steps. S1: Inject liquid into the valve body, detect the internal pressure of the liquid by a sensor and record it as the initial pressure. The middle of the valve core is in close 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, the valve core moves upward, and the wave spring begins to be compressed. As a result, the liquid is discharged from the drain passage. S3: After the sensor detects that the liquid pressure in the valve body has recovered to the normal state, the center console drives the rotating shaft by controlling the rotation of the motor, pushes the wave spring and its valve core, so that the extension in the middle of the valve core newly adheres to the through hole in the side wall of the valve body and returns to the initial state. The rotation speed of the motor is N:

Number

[0012] Optionally, at S2, the liquid volume of the liquid discharged from the passage is ΔV: [Number] is. Here, L is the total length of the pipeline, t is the average thickness of the pipeline, d is the average diameter of the pipeline, E is the average elastic modulus of the pipeline, k is the bulk modulus of elasticity of the liquid, ΔP is the value by which the blood pressure exceeds the valve opening pressure of the valve core when the blood pressure is higher than the valve opening pressure of the valve core, V0 is the volume of blood in the blood vessel under atmospheric pressure, and p0 is the valve opening pressure value of the valve core.

[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 valve core can realize the up and down movement between the valve body and the valve cap by pressing or loosening the wave spring, and finally can operate immediately when the symptoms of high blood pressure appear, thereby lowering the blood pressure as soon as possible and achieving the effect of quickly and safely lowering the blood pressure.

[0014] (2) The present invention can accurately adjust the blood pressure value by accurately determining the operation time of the valve core through the pressure adjustment method. In addition, this device can also be adjusted remotely, and different schemes can be set according to different users or different times of the users, and the accurate blood pressure lowering requirements at different stages can be met.

[0015] (3) By providing the valve body, valve cap, valve core, sealing device and driving device, the present invention can prevent the user from developing drug resistance and losing the drug effect, and can lower the blood pressure effectively and safely for a long time.

Brief Description of the Drawings

[0016]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

[0017] Explanation of Reference Signs 1 - valve body; 2 - blood pressure sensor; 3 - sensor O-ring; 4 - O-ring; 5 - C-ring; 6 - valve cap; 7 - bolt; 8 - rectangular seal ring; 9 - cylindrical pin; 10 - cover plate; 11 - motor; 12 - rotating shaft; 13 - slider; 14 - wave spring; 15 - valve core; 16 - liquid passage groove; 17 - extension structure; 18 - spring space.

Modes for Carrying Out the Invention

[0018] Hereinafter, exemplary embodiments, features, and aspects of the present invention will be described in detail with reference to the drawings. The same reference signs in the drawings identify functionally identical or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0019] The present invention provides a pressure control valve for use in the blood system. This device can be directly placed in the blood vessels of the human body, and its placement method is the same as that of other medical surgical instruments when placed in the human body.

[0020] As shown in FIGS. 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. 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 location where the valve cap 6 and the valve body 1 are connected.

[0021] The valve body 1 has a hollow column structure, and through holes are opened on the side wall of the valve body 1. On the side wall of the valve body 1 on both sides of the through hole, concave grooves having a thread structure are opened.

[0022] The lower surface of the valve cap 6 is connected to the side wall of the valve body 1, and threaded holes for bolts to pass through are opened on the upper surface of the valve cap 6. The bolts pass through the threaded holes and are connected to the concave grooves on the side wall of the valve body 1. A driving space for mounting the 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 respectively.

[0023] A drain passage is provided at the connection location between the valve cap 6 and the valve body 1. The drain pipeline is for discharging excess liquid when in a high-pressure state to reduce the liquid pressure.

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

[0025] The power supply can be charged wirelessly, and a charging port can be directly provided outside the human body, or the power supply can be replaced surgically.

[0026] A spring space 18 for the wave spring 14 to operate is provided at the first end of the valve core 15. An extension structure 17 is provided on the outer wall in the middle of the valve core 15. The extension structure 17 is for preventing the valve core 15 from sliding into the inside of the valve body 1. The second end of the valve core 15 has a hollow structure, and a plurality of liquid passage grooves 16 are formed 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 the 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 in the valve body 1 is at a normal value, the extension part in the middle 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 in the valve body 1 is at a high value, the liquid pushes the valve core 15, and the valve core 15 presses the wave spring 14. As a result, the extension part in the middle of the valve core 15 separates from the through hole of the valve body 1, and the flowing liquid flows out through the drain passage after passing through the valve core 15.

[0029] The sealing device is a sealing ring. The sealing ring may be a C-shaped sealing ring or an O-shaped sealing ring, and can be appropriately selected as needed.

[0030] In addition, the present invention further provides a pressure adjustment method for a pressure control valve used in a blood system. This method includes the following steps.

[0031] S1: Inject liquid into the interior of the valve body 1, detect the internal pressure of the liquid with a sensor and record it as the initial pressure. The middle part of the valve core 15 is in close contact with the through-hole of the valve body 1, and the wave spring 14 remains unchanged.

[0032] S2: As the liquid pressure in the valve body 1 begins to increase, the valve core 15 moves upward, and the wave spring 14 begins to be compressed. As a result, the liquid is discharged through the drainage passage.

[0033] S3: After the sensor detects that the liquid pressure in the valve body 1 has returned to the normal state, the center console drives the rotating shaft 12 by controlling the rotation of the motor 11, pushing the wave spring 14 and its valve core 15. As a result, the outer extension in the middle of the valve core 15 newly adheres to the through-hole on the side wall of the valve body 1 and returns to the initial state. To adjust from the initial state (the state where the mounting space is the largest) to the state where the valve opening pressure is p0 (the state where the 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] In S2, the liquid volume of the liquid discharged from the passage is ΔV:

Number

[0036] Embodiment The pressure control valve of the present invention is introduced into the human blood circulation system. Specifically, the blood vessel is cut, one end of the cut portion is connected to the inlet of the valve body 1, and the other end is connected to the outlet of the valve body 1. Thus, the 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 the cavity composed of the valve body 1, the O-ring seal 4, the blood pressure sensor 2, the sensor O-ring seal 3, and the valve core 15. Since the blood has pressure, the lower end of the valve core 15 receives the action of 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 pair 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, and thereby, the adjustment of the biasing force of the wave spring 14 is realized.

[0039] Since the wave spring 14 has a biasing force, the upper end of the valve core 15 receives the action of force. From the above, 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-ring seal 4.

[0040] When the blood pressure is not high enough, the force acting on the lower end is not sufficient, so the force acting on the upper end cannot be overcome to release the seal between the valve core 15 and the O-ring seal 4.

[0041] When the blood pressure is high enough, the force acting on the lower end becomes large enough to overcome the force acting on the upper end and release the seal between the valve core 15 and the O-ring seal 4. As a result, blood enters the cavity formed by the valve body 1, valve cap 6, O-ring seal 4, C-ring seal 5, blood pressure sensor 2, and rectangular seal ring. At this time, although the blood volume in the human blood system decreases, since the volume of the human blood system does not change, the blood pressure drops. When the blood pressure drops to a predetermined value, the force acting on the lower end cannot overcome the force acting on the upper end, so the seal between the valve core 15 and the O-ring seal 4 cannot be released, and the blood does not overflow. The blood that has overflowed into the cavity formed by the valve body 1, valve cap 6, O-ring seal 4, C-ring seal 5, blood pressure sensor 2, and rectangular seal ring can be discharged from the O-shaped 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 by the device at its lower end and can transmit the blood pressure value to the corresponding equipment.

[0043] The blood discharge volume of the present invention can be estimated by the following method. As shown in Fig. 5, Fig. 5a is a blood vessel model, and Fig. 5b is a diagram of the force-receiving state of the blood vessel wall. Here, L is the total length of the human blood vessel, t is the average thickness of the human blood vessel, d is the average diameter of the human blood vessel, and E is the average elastic modulus of the human 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 in the blood vessel, the state of the force received by the blood vessel wall is shown in Fig. 5b. From the balance of forces in the vertical direction,

Equation

[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 is [Number] becomes as follows.

[0052] Assuming the bulk modulus of blood is k, the relationship between the volume V0 of blood in the blood vessel at blood pressure p when placed under atmospheric pressure and V p is [Number] as follows.

[0053] [Number] becomes as follows.

[0054] If the valve opening blood pressure value set by a certain patient is p0 and the blood pressure increases by Δp based on p0, the amount of blood that the human blood safety valve should discharge is [Number] as follows.

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

[0056] When the valve opening pressure is the minimum value P 0min the mounting height of the spring space 18 is H. In this case, from the balance of forces of the valve core 15, [Number] it can be seen that [Number] is obtained.

[0057] When the opening pressure is the maximum value P 0max the mounting height of the spring space 18 is h. In this case, from the balance of forces of the valve core 15,

Number

Number

[0058] From the above, the range of the value of the opening pressure P0 is

Number

[0059] Here, L, K, H, h, and d are all specific 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. That is, P 0min and P 0max become known numbers as target values,

Number

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

Number

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

Number

[0062]

Number

[0063] As a result, the necessary length ΔL by which the spring compresses after being attached is

Number

[0064] The required rotational speed N of the motor 11 is

Number

[0065] Assuming the rotational speed of the motor 11 is n, the rotation time t of the motor 11 is

Number

[0066] In the arithmetic expressions of N and t, H, d, P, L, and K are intrinsic parameters, and since P0 is a known number as a target value, N and t can be determined.

[0067] The above embodiments are for explaining the preferred embodiments of the present invention and do not limit the scope of the present invention. As long as they do not depart from the idea of the present invention, various modifications and improvements made by those skilled in the art to the technical means of the present invention should all be included in the protection scope specified in the claims of the present invention.

Claims

1. A pressure control valve used in the blood system, comprising a valve body, a valve cap, a valve core, a sealing device, and a driving device. The valve cap is connected to the side wall of the valve body, and the valve core, the sealing device, and the driving device are provided at the location where the valve cap and the valve body are connected. The valve body has a hollow column structure, and through holes are opened on the side wall of the valve body. On the side wall of the valve body on both sides of the through hole, concave grooves having a thread structure are opened. The lower surface of the valve cap is connected to the side wall of the valve body. On the upper surface of the valve cap, a screw hole for a bolt to pass through is opened. The bolt passes through the screw hole and is connected to the concave groove on the side wall of the valve body. On the upper surface of the valve cap, a driving space for mounting the driving device is further provided. Above the driving space, a cover plate is provided. Both sides of the cover plate are connected to the valve cap via cylindrical pins respectively. A drainage passage is provided at the location 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. Below the cover plate, the power source, the motor, the rotating shaft, the slider, the wave spring, and the valve core are provided in sequence. The output end of the power source is connected to the input end of the motor. The output end of the motor is connected to the first end of the rotating shaft. The second end of the rotating shaft is fixedly connected to the first end of the slider. The first end of the wave spring contacts the second end of the slider. The second end of the wave spring contacts the first end of the valve core. A spring space for the wave spring to operate is provided at the first end of the valve core. An extension structure is provided on the outer side wall in the middle of the valve core. The extension structure prevents the valve core from sliding into the inside of the valve body. The second end of the valve core has a hollow structure, and a plurality of liquid passage grooves are opened on the side wall of the second end of the valve core. A pressure control valve used in the blood system, characterized in that.

2. A sensor is further provided on the side wall of the valve body. The sensor is connected to the center console by a wireless device, and the center console remotely controls the rotation of the motor by the wireless device. The pressure control valve according to claim 1 is characterized in that.

3. When the liquid pressure in the valve body is a normal value, the middle extension part 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 is not in communication with the valve body. When the liquid pressure in the valve body is a high value, the liquid pushes the valve core, and the valve core presses the wave spring, so that the middle extension part of the valve core separates from the through hole of the valve body. The flowing-out liquid flows out from the drain passage after flowing through the valve core. The pressure control valve according to claim 2 is characterized in that.

4. The sealing device is a sealing ring. The pressure control valve according to claim 1 is characterized in that.

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