CN110064115B

CN110064115B - Frequency regulating valve for breathing machine

Info

Publication number: CN110064115B
Application number: CN201910495775.3A
Authority: CN
Inventors: 朱红波
Original assignee: First Peoples Hospital of Changzhou
Current assignee: First Peoples Hospital of Changzhou
Priority date: 2019-06-10
Filing date: 2019-06-10
Publication date: 2020-01-03
Anticipated expiration: 2039-06-10
Also published as: CN110064115A

Abstract

The invention relates to the technical field of valves, in particular to a frequency regulating valve for a breathing machine, which comprises a main body, wherein the main body is provided with a cylindrical cavity, a valve body is rotatably arranged in the cylindrical cavity, a servo motor is arranged outside the main body and used for driving the valve body to rotate, and the flow area of gas passing through the main body is changed in a reciprocating manner in the rotating process of the valve body, so that the breathing machine can realize reciprocating regulation of different positive pressure values under the condition of certain gas source flow, and different breathing frequencies can be obtained by regulating the rotating speed of the servo motor. The invention can solve the problem that the breathing frequency of the continuous positive airway pressure breathing machine in the prior art is difficult to control.

Description

Frequency regulating valve for breathing machine

Technical Field

The invention relates to the technical field of valves, in particular to a frequency regulating valve for a breathing machine.

Background

The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient. In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field.

Continuous positive airway pressure is a main mechanical ventilation mode of a breathing machine, which means that a patient artificially applies certain positive airway pressure in the whole breathing cycle under the condition of spontaneous breathing, and the specific working principle is as follows: the inspiratory phase gives continuous positive pressure airflow, and the expiratory phase also gives certain resistance, so that the airway pressures of the inspiratory phase and the expiratory phase are both higher than the atmospheric pressure. In the above process, the continuous positive pressure airflow is larger than the inspiratory airflow during inspiration, so that the inspiration of the patient is labor-saving, the gas exchange area is increased, and the collapse of the airway and the alveoli is prevented.

In the control of the breathing machine frequency, the Chinese patent (application number: 201621463108.5, named as a breathing machine with the breathing frequency controlled by a computer) discloses that the working frequency of the breathing machine can be adjusted according to the requirements of a patient by controlling the breathing machine frequency through a control circuit module and changing the oscillation frequency of an unstable oscillator. However, when the control method is applied to a Continuous Positive Airway Pressure (CPAP) breathing machine, the problem that two positive pressure values with different values are difficult to control exists, and the design cost and the control difficulty of the product are increased invisibly.

In view of the above problems, the designer is based on the practical experience and professional knowledge that are abundant for many years in engineering application of such products, and is actively researched and innovated in cooperation with the application of scholars, so as to create a frequency regulating valve for a breathing machine, and the frequency regulating valve is more practical.

Disclosure of Invention

The invention aims to solve the problem that the breathing frequency of a continuous positive airway pressure respirator in the prior art is difficult to control.

In order to achieve the purpose, the invention adopts the technical scheme that:

a frequency regulating valve for a breathing machine,

the breathing machine comprises a main body, the main part has cylindrical cavity, the valve body is installed to cylindrical cavity internal rotation, the main part outside is provided with servo motor for drive the valve body rotates, wherein, valve body pivoted in-process changes reciprocally through the flow area of the gas of main part, thereby under the certain circumstances of air supply flow for the breathing machine realizes the regulation of reciprocal different malleation values, and passes through the regulation of servo motor rotational speed and obtain different respiratory frequency.

Further, the inlet end of the main body is provided with a filter screen for filtering the air-oxygen mixture.

Furthermore, the outlet end of the main body is provided with a flow equalizing net for equalizing the flowing air-oxygen mixture.

Furthermore, the outer surface of the valve body comprises a partial spherical surface and two parallel planes, the distances from the two planes to the center of the sphere are equal, and the diameter of the spherical surface is equal to that of the cylindrical cavity;

at least one through channel is arranged between the two planes, an annular air bag structure is arranged in the through channel, gas in the annular air bag structure is conveyed through the channel communicated with the center of the rotating shaft of the valve body, and the flow area of the through channel is controlled by adjusting the gas amount in the annular air bag structure.

Further, the through channel is perpendicular to the plane.

Furthermore, the outer wall of the main body is of a prism structure, two cylindrical grooves are symmetrically formed in the inner wall of the main body along the diameter direction of the cylindrical cavity and used for mounting the bearing assembly, a mounting through hole is formed in the center of the bottom of the cylindrical groove, and the two mounting through holes are used for mounting a fixing screw and a fixing rotating shaft respectively;

the end part of the fixing screw is provided with at least one bulge extending into the valve body, and the fixing screw is positioned outside the main body and is provided with a convex edge attached to the prismatic structure;

be provided with at least one on the tip of fixed rotating shaft and stretch into the inside arch of valve body, fixed rotating shaft is located the main part outside be provided with the protruding edge of prismatic structure laminating to and be used for carrying out the installation shaft part installed to the gear.

Furthermore, the end parts of the fixing screw and the fixing rotating shaft are of spherical structures which are attached to the partial spherical surfaces.

Furthermore, a sealing ring structure is arranged between the convex edge and the outer surface of the prism structure.

Further, one side of the bearing assembly, which is close to the cylindrical cavity, is covered with a sealing cover structure.

The invention has the beneficial effects that: the valve body is driven to rotate through the servo motor, when the valve body rotates to an angle with a large gas flow area in the main body, a patient inhales, when the valve body rotates to an angle with a small gas flow area in the main body, the patient exhales, wherein when the patient exhales, the flow of the gas source is constant, so that the constant-flow gas can be accumulated and obtain high pressure due to the throttling action of the valve body, when the valve body rotates to a position with a large gas flow area in the main body, the accumulated gas pressure can provide air-oxygen mixed gas with high pressure for the patient, so that the inhalation is easier, after the inhalation process is finished, the valve body rotates to the throttling position, so that the circulating gas is less, the low gas pressure can provide a low positive pressure value, a novel mechanical ventilation mode of the respirator continuously ventilating the positive pressure airway is obtained, and the transition of two different positive pressure values in the process is relatively gentle, the breathing principle is better met, and the breathing frequency can be adjusted by adjusting the rotating speed of the servo motor.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a ventilator employing a frequency regulating valve of the present invention;

FIG. 2 is a cross-sectional view of a frequency adjustment valve;

FIG. 3 is a schematic structural view of a valve body;

FIG. 4 is a schematic view of the structure of the frequency regulating valve;

reference numerals: the air source 1, the air-oxygen mixer 2, the host 3, the humidifier 4, the external pipeline 5, the main body 6, the valve body 7, a partial spherical surface 71, a plane 72, a through channel 73, an annular air bag structure 74, the servo motor 8, the filter screen 9, the flow equalizing net 10, the bearing assembly 11, the fixing screw 12 and the fixing rotating shaft 13.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1 and 2, the breathing machine comprises a gas source 1, an air-oxygen mixer 2, a main machine 3, a humidifier 4 and an external pipe 5, wherein the gas source 1 passes through the air-oxygen mixer 2, is supplied to a patient through the external pipe 5 under the control of the main machine 3, and meanwhile, the humidifier 4 humidifies gas in the external pipe 5; the external pipeline 5 is provided with the frequency regulating valve, the frequency regulating valve comprises a main body 6, the main body 6 is provided with a cylindrical cavity, a valve body 7 is rotatably installed in the cylindrical cavity, a servo motor 8 is arranged outside the main body 6 and used for driving the valve body 7 to rotate, in the rotating process of the valve body 7, the flow area of gas passing through the main body 6 is changed in a reciprocating mode, therefore, under the condition that the flow of the gas source 1 is constant, the breathing machine can achieve reciprocating regulation of different positive pressure values, and different breathing frequencies can be obtained through regulation of the rotating speed of the servo motor 8. In the invention, the working principle is as follows: the valve body 7 is driven to rotate by the servo motor 8, when the valve body 7 rotates to an angle with a large gas flow area in the main body 6, a patient inhales, and when the valve body 7 rotates to an angle with a small gas flow area in the main body 6, the patient exhales, wherein when the patient exhales, because the flow of the gas source 1 is constant, the constant flow of gas can be accumulated and obtain high pressure due to the throttling effect of the valve body 7, and when the valve body 7 rotates to a position with a large gas flow area in the main body 6, the accumulated gas pressure can provide air-oxygen mixed gas with high pressure for the patient, so that the patient inhales more easily, and after the inspiration process is finished, because the valve body 7 rotates to the throttling position, the circulating gas is less, the low gas pressure can provide a low positive pressure value, so that a novel mechanical ventilation mode of the continuous positive airway pressure ventilation is obtained, the transition of two different positive pressure values in the process is relatively gentle, the principle of breathing is more met, and the regulation of the breathing frequency can be realized through the regulation of the rotating speed of the servo motor.

When the respiratory frequency regulating valve is installed, the respiratory frequency regulating valve can be installed in the middle of a pipeline in various forms; for example, a flange is arranged at the end part of the main body 6, and the flange is connected with a pipeline; or the connection is realized by partially coating the outer wall of the main body 6 through an elastic rubber tube, and the like, which are all within the protection scope of the invention.

Preferably, the inlet end of the main body 6 is provided with a filter screen 9 for filtering the air-oxygen mixture. The filter screen 9 can be any one of a flexible filter medium, a rigid filter medium or a loose filter medium, and is within the protection scope of the present invention as long as the filter requirement is met, and the gas used for breathing can be cleaner through the arrangement.

As a preference of the above embodiment, the outlet end of the main body 6 is provided with a flow equalizing net 10 for equalizing the flowing air-oxygen mixture. In the invention, the flow-equalizing net 10 is not easy to adopt a structure with larger resistance, and can be provided with one, two or even multiple channels, and through the arrangement, the gas can be more stable, the turbulent flow of the gas caused by pressure change and throttling action is reduced, and the smoothness of the respiration of a patient is ensured.

Specifically, as shown in fig. 3, the outer surface of the valve body 7 includes a partial spherical surface 71 and two parallel planes 72, the distance from the two planes 72 to the center of the sphere is equal, and the diameter of the spherical surface is equal to the diameter of the cylindrical cavity; at least one through channel 73 is arranged between the two planes 72, an annular air bag structure 74 is arranged in the through channel 73, air in the annular air bag structure 74 is conveyed through a channel communicated with the center of the rotating shaft of the valve body 7, and the flow area of the through channel 73 is controlled by adjusting the amount of the air in the annular air bag structure 74. In the preferred embodiment, the annular bladder structure 74 is configured to adjust the difference between two positive pressure values, wherein the larger positive pressure value, i.e., the inspiratory pressure, is adjusted by the main body 3, and wherein the pressure value, once determined, is adjusted by adjusting the annular bladder structure 74 to inflate or deflate at most, thereby increasing or decreasing the flow area through the passageway 73 to adjust the expiratory pressure. When the valve body 7 is rotated to the position shown in fig. 4, the spherical surface 71 is attached to the inner wall of the cylindrical cavity, so that the gas can only pass through the center of the annular air bag structure 74, and the smaller flow area plays a role of flow restriction, on one hand, the gas is accumulated in pressure due to flow restriction, on the other hand, the smaller gas flow can meet the requirement of exhalation resistance, a specific pressure value can be detected by a sensor, and the charging amount of the annular air bag structure 74 is adjusted according to the detection result, wherein the air bag can be pre-installed in the through passage 73, the number of the through passages 73 can be appropriately reduced and the inner diameter of the through passage can be increased in consideration of the problem of processing difficulty, and an inflation nozzle of the air bag can pass through the passage in the valve body 7 and the passage in the center of the rotating shaft of the valve body 7 to pass through the outside of the respiratory frequency adjusting valve, so as, the whole valve body 7 can be arranged into a split structure; in the preferred embodiment, the flow area can be adjusted by adjusting the distance between the plane 72 and the center of the sphere. When the valve body 7 is rotated to a position perpendicular to the position shown in fig. 4, the air-oxygen mixture gas can directly pass through the large gap between the flat surface 72 and the cylindrical inner wall, and in the present invention, it is necessary to ensure that the flow area at this position is larger than the flow area of all the through passages 73, thereby making the above adjustment significant.

Wherein the through channel 73 is perpendicular to said plane 72. The outer wall of the main body 6 is of a prism structure, two cylindrical grooves are symmetrically arranged on the inner wall of the main body 6 along the diameter direction and used for mounting the bearing assembly 11, a mounting through hole is formed in the center of the bottom of the cylindrical groove, and the two mounting through holes are respectively used for mounting a fixing screw 12 and a fixing rotating shaft 13; at least one bulge extending into the valve body 7 is arranged on the end part of the fixing screw 12, and a convex edge attached to the prismatic structure is arranged on the outer part of the main body 6 of the fixing screw 12; be provided with at least one on the tip of fixed rotating shaft 13 and stretch into the inside arch of valve body 7, fixed rotating shaft 13 is located the main part 6 outside be provided with the protruding edge of prismatic structure laminating to and be used for carrying out the installation shaft part installed to the gear. In this preferred scheme, when being right valve body 7 installs, at first to two bearing assembly 11 installs, later will valve body 7 is put into in the cylindrical cavity of main part 6, when putting into target in place the back, on the one hand will set screw 12 knocks into an installation through-hole, and the arch stretches into in the valve body 7, on the other hand will fixed rotating shaft 13 knocks into in another installation through-hole, the arch stretches into in the valve body 7 equally, in the in-process that whole respiratory frequency governing valve used, work as servo motor 8 starts the back, through bearing assembly 11's support, fixed rotating shaft 13 drives through the arch valve body 7 rotates, and here the arch must eccentric settings for the passageway of avoiding the gas transmission, can realize pivoted transmission.

In order to ensure the stability of the installation of the valve body 7, the ends of the fixing screw 12 and the fixing rotating shaft 13 are in a spherical structure jointed with the partial spherical surface 71; a sealing ring structure is arranged between the convex edge and the outer surface of the prism structure, so that gas leakage is avoided; one side of the bearing assembly 11 close to the cylindrical cavity is covered with a sealing cover structure, so that the sealing cover structure plays a role in isolation and avoids gas pollution.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A frequency control valve for a ventilator, characterized in that: the breathing machine comprises a main body (6), wherein the main body (6) is provided with a cylindrical cavity, a valve body (7) is rotatably mounted in the cylindrical cavity, a servo motor (8) is arranged outside the main body (6) and used for driving the valve body (7) to rotate, and in the rotating process of the valve body (7), the flow area of gas passing through the main body (6) is changed in a reciprocating manner, so that under the condition that the flow of a gas source (1) is constant, the breathing machine can realize reciprocating adjustment of different positive pressure values, and different breathing frequencies can be obtained by adjusting the rotating speed of the servo motor (8);

the outer surface of the valve body (7) comprises a partial spherical surface (71) and two parallel planes (72), the distances between the two planes (72) and the center of the sphere are equal, and the diameter of the spherical surface is equal to that of the cylindrical cavity;

at least one through channel (73) is arranged between the two planes (72), an annular air bag structure (74) is arranged in the through channel (73), air in the annular air bag structure (74) is conveyed through a channel communicated with the center of the rotating shaft of the valve body (7), and the flow area of the through channel (73) is controlled by adjusting the amount of air in the annular air bag structure (74).

2. The frequency regulating valve for a respirator according to claim 1, characterized in that the inlet end of the main body (6) is provided with a filter screen (9) for filtering the air-oxygen mixture.

3. The frequency regulating valve for a respirator according to claim 1, characterized in that the outlet end of the main body (6) is provided with a flow equalizing net (10) for equalizing the flowing air-oxygen mixture.

4. The frequency regulating valve for a ventilator according to claim 1, wherein the through channel (73) is perpendicular to the plane (72).

5. The frequency regulating valve for the breathing machine according to claim 1, wherein the outer wall of the main body (6) is of a prism structure, two cylindrical grooves are symmetrically arranged on the inner wall of the main body (6) along the diameter direction of the cylindrical cavity for installing the bearing assembly (11), a mounting through hole is arranged at the center position of the groove bottom of each cylindrical groove, and the two mounting through holes are respectively used for installing a fixing screw (12) and a fixing rotating shaft (13);

the end part of the fixing screw (12) is provided with at least one bulge extending into the valve body (7), and the fixing screw (12) is positioned outside the main body (6) and is provided with a convex edge attached to the prismatic structure;

be provided with at least one on the tip of fixed rotating shaft (13) and stretch into the arch of valve body (7) inside, fixed rotating shaft (13) are located main part (6) outside be provided with the protruding edge of prismatic structure laminating to and be used for carrying out the installation shaft part installed to the gear.

6. The frequency regulating valve for a respirator according to claim 5, characterized in that the ends of the fixing screw (12) and the fixing shaft (13) are of spherical structure which fits the part-spherical surface (71).

7. The frequency adjustment valve for a ventilator according to claim 5, wherein a sealing ring structure is disposed between the convex rim and the outer surface of the prism structure.

8. The frequency regulating valve for a respirator according to claim 5, characterized in that the side of the bearing assembly (11) close to the cylindrical cavity is covered with a sealing cover structure.