PEEP (positive end expiratory pressure) valve for breathing machine and anaesthesia machine

Abstract

The utility model discloses a PEEP valve for a breathing machine and an anaesthesia machine. The PEEP valve comprises a thrust driving assembly and an air path assembly. The thrust driving assembly comprises an upper cover, a second printed circuit board, a coil support, a coil, an inner magnet yoke, an outer magnet yoke, a permanent magnet, a first printed circuit board, a flexible circuit board and a push rod. The inner magnet yoke and the permanent magnet are located in the outer magnet yoke and are coaxial; the coil is wound on the outer ring of the coil bracket; the push rod is fixed in the center of the coil bracket; the coil support is located on the inner magnet yoke, the push rod penetrates through the permanent magnet and a center hole of the inner magnet yoke, the two ends of the flexible circuit board are connected with the first printed circuit board and the second printed circuit board respectively, the first printed circuit board is fixed to the coil support, and the second printed circuit board is fixedly connected to the upper cover. The top of the push rod penetrates through the center through hole of the upper cover and is in clearance fit with the center through hole. The permanent magnet synchronous motor is high in efficiency, long in service life, strong in manufacturability and high in thrust linearity.

Description

Technical Field

[0001] The utility model relates to the field of medical equipment and is mainly used in a ventilator and an anesthesia machine to provide positive end-expiratory pressure for a patient during the exhalation phase of mechanical ventilation. Background Art

[0002] Positive end expiratory pressure (PEEP) breathing means that during mechanical ventilation, the PEEP valve is used to maintain a certain positive pressure in the airway during the expiratory phase, so that collapsed alveoli can expand and atelectasis alveoli can be re-expanded, thereby increasing the functional residual capacity and lung compliance, and facilitating the diffusion of oxygen through the expiratory membrane. Therefore, PEEP can effectively accelerate the repair process by improving oxygenation, avoid damage to lung tissue, and gain opportunities for comprehensive treatment.

[0003] Typically, the existing PEEP valve positions the permanent magnet by protruding a rod integral with the outer magnetic yoke from the center of the inner part of the cylindrical outer magnetic yoke, which reduces the magnetic resistance of the central hole of the permanent magnet, increases the leakage magnetic field at this location, and reduces the utilization rate of the magnetic field.

[0004] The PEEP valve used in ventilators and anesthesia machines adopts a closed structure. In order to reduce the impact of internal wire resistance on the motor thrust, the existing technology often directly welds the thinner and softer coil lead wire to the adapter plate of the side wall (external yoke). Since the wire diameter of the coil is usually around 0.2mm, the coil lead wire frequently reciprocates with the coil seat and is easily broken, which restricts the reliability of the motor and increases the risk of ventilators and anesthesia machines.

[0005] The range of the magnetic field is not limited to the air gap between the inner and outer yokes. There is also a magnetic field distribution in the larger space outside the air gap. The magnetic induction intensity gradually weakens from the air gap to the outside. Due to the limitations of the internal space of the PEEP valve and the system power consumption, the height of the drive coil cannot pass through the entire magnetic field outside the air gap at the initial position. From the initial position to the maximum stroke, the magnetic induction intensity of the magnetic field in which the coil is located gradually increases and then tends to stabilize. Therefore, the relationship between the thrust and current of the PEEP valve push rod in the entire stroke is nonlinear. Existing PEEP valves are difficult to meet the thrust linearity requirements of ventilators and anesthesia machines.

[0006] In the prior art, when the PEEP valve is in the release phase of the working cycle, the exhaled airflow pushes the push rod backward through the diaphragm, causing the coil to collide and vibrate with the inner magnetic yoke, and generating noise, which affects the service life of the coil. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a PEEP valve for a ventilator and an anesthesia machine, comprising a thrust drive assembly and an air circuit assembly, wherein the thrust drive assembly is located at the bottom of the air circuit assembly; the thrust drive assembly comprises an upper cover, a No. 2 printed circuit board, a coil bracket, a coil, an inner magnetic yoke, an outer magnetic yoke, a permanent magnet, a No. 1 printed circuit board, a flexible circuit board, and a push rod, wherein the inner magnetic yoke is located above the permanent magnet, the outer surface of the outer magnetic yoke is cylindrical, the top of the outer magnetic yoke is provided with an opening, the inner magnetic yoke and the permanent magnet are located in the opening, and the three The coil, coil support and push rod constitute a coil assembly, the coil is wound around the outer ring of the coil support, and the push rod is fixed at the center of the coil support; the coil support is located on the inner magnetic yoke, the push rod passes through the center holes of the permanent magnet and the inner magnetic yoke, and the push rod is gap-matched with the inner magnetic yoke and the permanent magnet; the two ends of the flexible circuit board are respectively connected to the No. 1 printed circuit board and the No. 2 printed circuit board, the No. 1 printed circuit board is fixed on the coil support, and the No. 2 printed circuit board is fixedly connected to the upper cover; the top of the push rod passes through the central through hole of the upper cover, and the two are gap-matched.

[0008] Preferably, the air circuit assembly includes a valve body, a diaphragm, a lining plate, and a valve body adapter block: the diaphragm is located on the lining plate, and the two are bonded together; a groove is provided in the valve body adapter block, and the diaphragm and the lining plate are located in the groove; the valve body is located on the valve body adapter block, and the two are snap-connected, and the diaphragm is located at the bottom of the valve body air inlet; a through hole is provided at the bottom of the valve body adapter block, and a boss is provided at the top of the upper cover, and the two are threadedly connected; the top of the push rod is located under the lining plate.

[0009] Preferably, the thrust drive assembly also includes a linear adjustment assembly, which includes a sleeve, a spring and an adjusting stud, and the sleeve and the adjusting stud are respectively fixed at the upper and lower ends of the spring; a through hole is provided at the bottom center of the outer magnetic yoke, and the linear adjustment assembly passes through the through hole, and the adjusting stud is connected to the outer magnetic yoke through a thread; the sleeve is located in the center hole of the permanent magnet, and the two are clearance-matched, and the sleeve is located at the bottom of the push rod.

[0010] Preferably, the flexible circuit board is ring-shaped, and the flexible circuit board and the coil lead wire are connected through a No. 1 printed circuit board.

[0011] Preferably, the upper cover is provided with a limiting groove, and the second printed circuit board is located in the limiting groove.

[0012] Preferably, the upper cover and the outer magnetic yoke are connected by screws.

[0013] The magnetic circuit of the PEEP valve of the utility model adopts an internal magnetic type, and the permanent magnet and the inner magnetic yoke are arranged inside the cylindrical outer magnetic yoke. The three are coaxial and constitute the magnetic circuit part of the PEEP valve. The coil, the coil bracket and the push rod constitute the coil assembly, the coil is wound on the outer ring of the coil bracket, and the push rod is fixed at the center of the coil bracket; the push rod of the coil assembly passes through the central hole of the permanent magnet and the inner magnetic yoke, and in the magnetic field, the coil is energized to generate thrust to provide power for the PEEP valve; the two ends of the flexible circuit board are respectively connected to two printed circuit boards, one printed circuit board is fixed on the coil bracket, and the other is fixed on the upper cover, so as to ensure the current transmission without affecting the free sliding of the coil assembly. The linear adjustment component consists of a sheath, a spring and an adjustment stud. The sheath and the adjustment stud are fixed at both ends of the spring respectively. The linear adjustment component is connected to the center hole at the bottom of the outer magnetic yoke through a thread. By adjusting the position of the nut, the bottom of the push rod can be pushed to adjust the position of the coil component. The diaphragm controls the opening and closing of the air inlet in the valve body. When the mechanical ventilation reaches the inhalation stage, the coil is energized, and the push rod pushes the diaphragm upward to seal the valve port, and the gas enters the patient's lungs. When it reaches the exhalation stage, the coil is de-energized, the push rod falls back, the valve port opens, and the patient begins to exhale. By controlling the current in the coil, different valve port openings can be obtained, different exhalation resistances can be obtained, the exhalation time can be extended, and the oxygenation state can be improved. The utility model has high efficiency, long service life, strong processability, and high thrust linearity.

[0014] The utility model uses the limiting groove and the permanent magnet inside the outer magnetic yoke to position. Compared with using the center rod to position the permanent magnet, the magnetic resistance of the center hole of the permanent magnet is increased, the leakage magnetic flux there is reduced, and the magnetic induction intensity of the functional air gap between the outer magnetic yoke and the inner magnetic yoke is increased by not less than 25%, thereby improving the utilization rate of the magnetic field and achieving high efficiency.

[0015] The utility model uses an annular flexible circuit board (FPC) inside the PEEP valve to lead out the lead wire of the coil. A No. 1 printed circuit board bonded to the coil bracket is used for connection between the flexible circuit board and the coil lead wire; the other end of the flexible circuit board is welded to the No. 2 printed circuit board fixed on the top cover. The annular flexible circuit board allows the deformation of the flexible circuit board to be evenly dispersed when the coil reciprocates, reducing the risk of the internal circuit of the flexible circuit board being broken due to stress concentration at both ends, thereby increasing the service life of the PEEP valve. Since the flexible circuit board, No. 1 printed circuit board and No. 2 printed circuit board are simple to manufacture, low in cost, and simple to weld between each other, they are suitable for mass production.

[0016] In order to meet the requirements of ventilators and anesthesia machines for the linearity of PEEP valve thrust, the utility model adds an adjustment linearity component at the bottom of the outer yoke, which consists of a sheath, a spring and an adjustment stud. One end of the spring is clamped on the limit rod of the adjustment stud, and the other end is interference fit with the sheath. When the adjustment stud is turned, the sheath will push the push rod to move upward, and by changing the position of the coil in the magnetic field, the stroke of increasing magnetic induction intensity is skipped, so that the coil starts to work from the starting point where the magnetic induction intensity is stable. The spring also buffers the impact of the push rod when it is retracted, reduces the impact of vibration on the life of the coil and the flexible circuit board, and reduces working noise.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following is a preferred embodiment, and is described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structural schematic diagram of a PEEP valve used for a ventilator and an anesthesia machine.

[0019] Figure 2 It is an exploded view of the PEEP valve of the utility model used for a ventilator and an anesthesia machine.

[0020] In the PEEP valve for a ventilator and anesthesia machine of the present invention, the following specific elements / parts are indicated by the following reference numerals:

[0021] 1. Valve body; 2. Diaphragm; 3. Valve body adapter block; 4. Lining plate; 5. Upper cover; 6. No. 2 printed circuit board; 7. Coil bracket and coil; 8. Inner yoke; 9. Outer yoke; 10. Permanent magnet; 11. Linear adjustment assembly; 12. No. 1 printed circuit board; 13. Flexible circuit board; 14. Push rod; 15. Sheath; 16. Spring; 17. Adjustment stud. DETAILED DESCRIPTION

[0022] The technical solution of the utility model will be clearly and completely described below in conjunction with specific implementation schemes, but those skilled in the art should understand that the implementation schemes described below are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model. Based on the implementation schemes in the utility model, all other implementation schemes obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1 , 2As shown, the utility model discloses a PEEP valve for a ventilator and an anesthesia machine, comprising a thrust drive assembly and an air circuit assembly, wherein the thrust drive assembly and the air circuit assembly are coaxial.

[0024] The thrust drive assembly includes an upper cover 5, a No. 2 printed circuit board 6, a coil bracket 7, a coil, an inner magnetic yoke 8, an outer magnetic yoke 9, a permanent magnet 10, a No. 1 printed circuit board 12, a flexible circuit board 13, and a push rod 14; a boss is provided at the bottom of the inner magnetic yoke 8, a hole adapted to the boss is provided at the center of the top of the permanent magnet 10, and the inner magnetic yoke 8 is located above the permanent magnet 10; the outer yoke 9 is cylindrical on the outside, an opening is provided at the top of the outer magnetic yoke 9, a limiting groove is provided at the bottom of the outer magnetic yoke 9, and the permanent magnet 10 is located in the limiting groove inside the outer magnetic yoke 9; the permanent magnet 10 and the inner magnetic yoke 8 are located inside the outer magnetic yoke 9, and the three are coaxial.

[0025] The coil, coil support 7 and push rod 14 constitute a coil assembly. The outer surface of the coil support 7 is a cylindrical surface. The coil is wound on the outer ring of the coil support 7. A through hole is provided in the center of the coil support 7. The push rod 14 passes through the center hole, and the two are connected by threads. The coil support 7 is located on the inner yoke 8. The bottom of the push rod 14 passes through the center hole of the inner yoke 8 and is located in the center hole of the permanent magnet 10. The push rod 14 is gap-fitted with the inner yoke 8 and the permanent magnet 10. The coil support 7 and the push rod 14 can slide up and down relative to the inner yoke 8. One end of the flexible circuit board 13 is welded to the No. 1 printed circuit board 12, and the other end is welded to the No. 2 printed circuit board 6. The No. 1 printed circuit board 12 is bonded to the coil support 7 and potted with potting glue. The upper cover 5 is provided with a limiting groove, and the No. 2 printed circuit board 6 is located in the limiting groove. The top of the push rod 14 passes through the center through hole of the upper cover 5, and the two are gap-fitted.

[0026] The air circuit assembly includes a valve body 1, a diaphragm 2, a lining plate 4, and a valve body adapter block 3: the diaphragm 2 is located on the lining plate 4, and the two are bonded; a groove is provided in the valve body adapter block 3, and the diaphragm 2 and the lining plate 4 are located in the groove; the valve body 1 is located on the valve body adapter block 3, and the two are snap-connected, and the diaphragm is located at the bottom of the air inlet of the valve body 1; a through hole is provided at the bottom of the valve body adapter block 3, and a boss is provided on the top of the upper cover 5, and the two are threadedly connected; the top of the push rod 14 is located below the lining plate 4.

[0027] The thrust drive assembly also includes a linear adjustment assembly, which includes a sleeve 15, a spring 16 and an adjustment stud 17. A hole is provided at the bottom of the sleeve 15, the top of the spring 16 is located in the hole, and the bottom end of the spring 16 is engaged with the buckle position of the adjustment stud 17.

[0028] A through hole is provided at the bottom center of the outer yoke 9, through which the linear adjustment assembly 11 passes, and the adjustment stud 17 is threadedly connected to the outer yoke 9; the sheath 15 is located in the center hole of the permanent magnet 10, and the two are clearance-matched, and the sheath 15 is located at the bottom of the push rod 14;

[0029] The upper cover 5 and the outer magnetic yoke 9 are connected by screws.

[0030] The utility model PEEP valve is composed of two major parts: a thrust drive assembly and an air path assembly. The thrust drive assembly is constructed as follows: the cylindrical outer surface of the permanent magnet 10 is positioned with the limiting groove inside the outer magnetic yoke 9, and is completely positioned by the suction of the magnet. This positioning method will not reduce the magnetic resistance of the inner hole of the permanent magnet 10; the boss of the inner magnetic yoke 8 is matched with the center hole of the permanent magnet 10, and is completely positioned by the suction of the magnet. The three together constitute the base part of the thrust drive assembly; the pins at one end of the flexible circuit board 13 are welded to the pad of the No. 1 printed circuit board 12, and the other end is welded to the No. 2 printed circuit board 6, and then the No. 1 printed circuit board 12 is bonded to the coil bracket 7, and potted with low-density and high-strength potting glue, which avoids the inconvenience of directly welding the thin copper wire with the lead-out wire. , and avoids stress concentration of the wire at the soldering point, which is also conducive to mass production. The coil is wound on the cylindrical surface of the coil support 7, and the push rod 14 is positioned with the center hole of the coil support 7 by using the external thread; the push rod 14 passes through the center hole of the inner yoke 8, and the fit is a clearance fit, so that the coil support 7 and the push rod 14 slide up and down along the inner yoke 8; the No. 2 printed circuit board 6 is inserted into the limit groove of the upper cover 5, and then the upper cover 5 and the outer yoke 9 are fastened with screws; one end of the spring 16 is clamped with the inner hole of the sheath 15, and the other end is clamped with the buckle position of the adjustment stud 16, and the three form a linear adjustment component 11, and finally the component is screwed into the threaded hole at the bottom of the outer yoke 9, and the thrust drive component is assembled. The composition of the gas circuit component is: the diaphragm 2 and the lining plate 4 are bonded and placed in the groove of the valve body adapter block 3, and then the valve body adapter block 3 and the valve body 1 are connected with screw buckles, and at the same time, the diaphragm 2 is also pressed by the two, and the assembly of the gas circuit component is completed. The thrust drive assembly and the gas path assembly are kept coaxial and connected with threads to complete the assembly of this example.

[0031] The air inlet of this embodiment is connected to the three-way connector, and the other two ends of the three-way connector are respectively connected to the patient and the ventilator. When the patient needs to inhale, the coil is energized, and the push rod 14 pushes the lining plate 4 and the diaphragm 2 upward to close the valve port, and the gas enters the patient's lungs; when the patient needs to exhale, the coil is de-energized, and the push rod 14 falls back due to gravity, the valve port opens, and the patient begins to exhale; by controlling the current in the coil, different valve port openings can be obtained, different exhalation resistances can be obtained, the exhalation time can be extended, and the oxygenation state can be improved.

[0032] Although the utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model. Therefore, these modifications or improvements made without departing from the spirit of the utility model are within the scope of protection claimed by the utility model.

Claims

1. A PEEP valve for a ventilator and anesthesia machine, characterized in that: The invention comprises a thrust drive assembly and an air circuit assembly, wherein the thrust drive assembly is located at the bottom of the air circuit assembly; the thrust drive assembly comprises an upper cover (5), a second printed circuit board (6), a coil support (7), a coil, an inner magnetic yoke (8), an outer magnetic yoke (9), a permanent magnet (10), a first printed circuit board (12), a flexible circuit board (13) and a push rod (14); the inner magnetic yoke (8) is located above the permanent magnet (10), the outer magnetic yoke (9) is cylindrical, the top of the outer magnetic yoke (9) is provided with an opening, the inner magnetic yoke (8) and the permanent magnet (10) are located inside the outer magnetic yoke (9), and the three are coaxial; the coil, the coil support (7) and the push rod (14) constitute the coil assembly The coil is wound around the outer ring of the coil support (7), and the push rod (14) is fixed at the center of the coil support (7); the coil support (7) is located on the inner magnetic yoke (8), and the push rod (14) passes through the central holes of the permanent magnet (10) and the inner magnetic yoke (8), and the push rod (14) is clearance-matched with the inner magnetic yoke (8) and the permanent magnet (10); the two ends of the flexible circuit board (13) are respectively connected to the first printed circuit board (12) and the second printed circuit board (6), the first printed circuit board (12) is fixed on the coil support (7), and the second printed circuit board (6) is fixedly connected to the upper cover (5); the top of the push rod (14) passes through the central through hole of the upper cover (5), and the two are clearance-matched.

2. The PEEP valve for a ventilator and anesthesia machine according to claim 1, characterized in that: The air circuit assembly comprises a valve body (1), a diaphragm (2), a lining plate (4), and a valve body adapter block (3); the diaphragm (2) is located on the lining plate (4), and the two are bonded together; a groove is provided on the top of the valve body adapter block (3), and the diaphragm (2) and the lining plate (4) are located in the groove; the valve body (1) is located on the valve body adapter block (3), and the two are snap-connected, and the diaphragm (2) is located at the bottom of the air inlet of the valve body (1); a through hole is provided at the bottom of the valve body adapter block (3), and a boss is provided on the top of the upper cover (5), and the boss is located in the through hole, and the two are threadedly connected; the top of the push rod (14) is located below the lining plate (4).

3. The PEEP valve for a ventilator and anesthesia machine according to claim 1 or 2, characterized in that: The thrust drive assembly also includes a linear adjustment assembly, which includes a sleeve (15), a spring (16) and an adjustment stud (17), wherein the sleeve (15) and the adjustment stud (17) are respectively fixed at the top and bottom ends of the spring (16); a through hole is provided at the bottom center of the outer magnetic yoke (9), the linear adjustment assembly (11) passes through the through hole, and the adjustment stud (17) is connected to the outer magnetic yoke (9) through a thread; the sleeve (15) is located in the center hole of the permanent magnet (10), the two are clearance-matched, and the sleeve (15) is located at the bottom of the push rod (14).

4. The PEEP valve for a ventilator and anesthesia machine according to claim 1, characterized in that: The flexible circuit board (13) is ring-shaped, and the flexible circuit board (13) and the coil lead wire are connected via a No. 1 printed circuit board (12).

5. The PEEP valve for a ventilator and anesthesia machine according to claim 1, characterized in that: The upper cover (5) is provided with a limiting groove, and the second printed circuit board (6) is located in the limiting groove.

6. The PEEP valve for a ventilator and anesthesia machine according to claim 1, characterized in that: The upper cover (5) and the outer magnetic yoke (9) are connected via screws.

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