Portable oxygen therapy device for nursing

Abstract

The invention relates to the field of medical equipment, in particular to a nursing portable oxygen therapy device which comprises an oxygen therapy mechanism and an oxygen mask. The oxygen conveying mechanism communicates with the oxygen mask and is used for conveying oxygen to the oxygen mask; a pressure sensing mechanism used for responding to pressure changes in the oxygen mask is arranged in the oxygen mask, a self-adaptive opening and closing mechanism is arranged on a communication path of the oxygen mask and the oxygen conveying mechanism, and the self-adaptive opening and closing mechanism is used for controlling connection and disconnection between the oxygen mask and the oxygen conveying mechanism based on response information of the pressure sensing mechanism. According to the invention, precious oxygen resources can be almost completely used for effective breathing of a patient, so that the oxygen supply time is prolonged under the same oxygen capacity.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically to a portable oxygen delivery device for nursing care. Background Technology

[0002] Oxygen therapy is a fundamental life support method used in clinical medicine and home care to correct or prevent hypoxemia in patients. For patients requiring long-term oxygen therapy or at risk of active hypoxia, maintaining a continuous and effective oxygen supply is crucial during transport, examinations, or outdoor activities. Against this backdrop, portable oxygen delivery devices have emerged, with the core objective of providing convenient and reliable oxygen support to patients in non-fixed locations.

[0003] Among existing technologies, medical oxygen bags (also known as "oxygen pillows") are one of the most widely used and oldest portable oxygen supply devices. They typically consist of a reservoir made of materials such as rubber or PVC, a connecting tube, and a nasal cannula. Their working principle involves pre-filling the reservoir with high-pressure oxygen. During use, the oxygen is delivered to the patient through the nasal cannula by manually squeezing the reservoir or relying on the negative pressure generated by the patient's own inhalation.

[0004] Although oxygen bags are used to some extent due to their low cost and simple structure, their inherent technical principles and operating modes lead to several insurmountable drawbacks: Traditional oxygen bags continuously output oxygen regardless of whether the patient is in the inspiratory or expiratory phase, as long as the system is connected. During the expiratory phase, this continuously flowing oxygen is not utilized by the lungs but is directly released into the surrounding environment, resulting in significant waste. The output flow rate of the oxygen bag depends on the pressure inside the bag. Initially, the pressure inside the bag is high, and the flow rate is large; as oxygen is consumed, the pressure inside the bag drops rapidly, and the flow rate decreases significantly, making it impossible to maintain a constant oxygen concentration that meets medical requirements. This unstable flow rate greatly reduces the effectiveness of oxygen therapy and cannot meet the treatment needs of patients who require precise control over their inhaled oxygen concentration.

[0005] Given the shortcomings of existing technologies, there is an urgent need for a new type of portable oxygen delivery device that can almost entirely utilize precious oxygen resources for the patient's effective breathing, thereby extending the oxygen supply time several times over with the same oxygen capacity and achieving precise and stable flow control. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a portable oxygen delivery device for nursing care, which delivers oxygen only when the patient inhales and automatically stops supplying oxygen when the patient exhales, thereby improving oxygen utilization.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows: A portable oxygen delivery device for nursing care includes an oxygen delivery mechanism and an oxygen mask; the oxygen delivery mechanism is connected to the oxygen mask and is used to deliver oxygen to the oxygen mask; a pressure sensing mechanism is provided inside the oxygen mask to respond to changes in pressure inside the oxygen mask; an adaptive opening and closing mechanism is provided on the communication path between the oxygen mask and the oxygen delivery mechanism, and the adaptive opening and closing mechanism is used to control the connection and disconnection between the oxygen mask and the oxygen delivery mechanism based on the response information of the pressure sensing mechanism.

[0008] The technical principles of the above solution are as follows:

[0009] The oxygen delivery system stores and supplies oxygen and connects to an oxygen mask via a connecting tube. The oxygen mask is worn on the patient's face, forming a closed or semi-closed space.

[0010] An oxygen mask contains a pressure-sensing mechanism that responds in real time to minute changes in pressure within the mask. When the patient inhales, negative pressure (pressure decreases) is generated inside the mask; when the patient exhales, positive pressure (pressure increases) is generated inside the mask. The pressure-sensing mechanism detects these pressure changes and generates corresponding signals.

[0011] An adaptive opening and closing mechanism is installed on the connection path between the oxygen mask and the oxygen delivery system. This mechanism is linked to the pressure sensing mechanism. Based on the response signal from the pressure sensing mechanism, the adaptive opening and closing mechanism automatically controls the on / off state of the oxygen pipeline.

[0012] During the patient's inspiratory phase, the pressure-sensing mechanism triggers the adaptive opening and closing mechanism to open, allowing oxygen to flow from the oxygen delivery mechanism to the mask for the patient to inhale.

[0013] During the patient's exhalation phase, the pressure-sensing mechanism triggers the adaptive opening and closing mechanism to shut off the oxygen supply and prevent oxygen from escaping.

[0014] The above approach has the following beneficial effects:

[0015] 1. This solution delivers oxygen only during the patient's inhalation, avoiding the ineffective loss of oxygen during exhalation. Compared to the continuous oxygen delivery mode of traditional oxygen bags, this device can use almost all of the oxygen for effective gas exchange, thus significantly reducing waste and extending the oxygen supply time with the same oxygen capacity. This is especially important for portable oxygen therapy devices, reducing the frequency of oxygen replenishment and enhancing the device's endurance.

[0016] 2. This protocol reduces the resistance to exhalation caused by continuous airflow within the mask through automatic oxygen discontinuation during the expiratory phase, thus reducing respiratory fatigue. Simultaneously, it prevents moisture buildup within the mask, improving wearing comfort. Precise control reduces the risk of excessive oxygen intake and prevents complications such as oxygen toxicity.

[0017] Furthermore, the oxygen delivery mechanism includes an oxygen delivery box, which contains a storage tank. The storage tank contains an oxygen bag and a compression mechanism. The oxygen bag is connected to an oxygen mask, and the compression mechanism is used to compress the oxygen bag.

[0018] Beneficial effects: By applying constant or adjustable external pressure to the oxygen bag through the compression mechanism, the flow rate reduction problem caused by the drop in internal air pressure in traditional oxygen bags can be overcome. Whether the oxygen bag is full or half empty, the compression mechanism can maintain a relatively stable output pressure, thereby ensuring that the oxygen flow rate delivered to the patient remains stable throughout the entire usage cycle.

[0019] Furthermore, the pressure-sensing mechanism includes several sliding grooves opened inside the oxygen mask, each groove having a sliding rod slidably connected to it. A spring is installed between the sliding rod and the inner wall of the groove, with both ends of the spring fixedly connected to the inner wall of the groove and the sliding rod, respectively. A base pad is installed at the end of the sliding rod away from the groove, and an elastic membrane is installed between the base pads, with the elastic membrane covering all the base pads inside the oxygen mask.

[0020] Beneficial effects: This mechanism consists of multiple groove-slide rod-spring units distributed inside the oxygen mask. In each unit, the slide rod can slide within the groove, and the spring provides the restoring force. The inner sides of all slide rods (the side closest to the patient's face) are connected by base pads and are entirely covered by an elastic membrane, forming a uniform sensing surface. When the patient inhales, a negative pressure is generated inside the mask. This negative pressure acts on the large-area elastic membrane, causing all base pads and slide rods to overcome the spring force and undergo a small, synchronous displacement towards the inside of the mask (i.e., away from the mask wall). This collective displacement motion is the "response" of the pressure-sensing mechanism.

[0021] By employing multiple distributed pressure-sensing units connected in parallel and integrated into a large sensing surface via an elastic membrane, even the slight pressure changes generated by a patient's breathing can be collected and amplified over a large area. Even very gentle breathing is sufficient to cause a detectable displacement in this integrated mechanism, ensuring the device's applicability to various patient types, including those with weak breathing. The multi-point collaborative operation also avoids the risk of single-point failure, resulting in high reliability.

[0022] The flexible sensing membrane, under the force of the spring, can better conform to the patient's different facial contours, forming a flexible seal. This helps reduce oxygen leakage from the gaps between the mask and the face, improving not only oxygen utilization efficiency but also the accuracy of the pressure signal detected by the pressure-sensing mechanism.

[0023] Furthermore, an oxygen supply tube connects the oxygen mask and the oxygen bag, and a Tesla valve is connected to the end of the oxygen supply tube near the oxygen mask. The Tesla valve is used to prevent the gas in the oxygen mask from flowing back into the oxygen supply tube.

[0024] Beneficial effects: When oxygen flows from the oxygen bag to the oxygen mask, the fluid mainly flows smoothly along the main path with less resistance. Although a certain pressure drop occurs, the overall flow resistance is relatively small. When attempting to redirect fluid (such as exhaled air from the patient or a high-pressure gas mixture within the mask) back from the mask end to the oxygen delivery tube, the fluid is forced into the complex, circuitous path and chambers within the Tesla valve. Within these chambers, the fluid undergoes numerous eddies, collisions, and kinetic energy dissipation, generating significantly higher resistance than forward flow, effectively suppressing and blocking backflow.

[0025] Without a Tesla valve, the positive pressure generated by the patient's exhalation may partially leak into the oxygen tubing in addition to acting on the pressure sensing mechanism. This weakens the pressure signal acting on the pressure sensing mechanism, potentially leading to incomplete closure or slow response of the adaptive opening and closing mechanism. The Tesla valve, by blocking backflow, ensures that the positive pressure inside the mask during the expiratory phase is "sealed" within the mask cavity, allowing it to be fully and accurately sensed by the pressure sensing mechanism. This makes the entire respiratory triggering control system more precise and reliable.

[0026] Furthermore, the adaptive opening and closing mechanism includes a transfer trough and a switching trough located inside the oxygen supply box. The two ends of the transfer trough are connected to the oxygen supply tube and the oxygen bag, respectively. The switching trough passes through the transfer trough, and a slider is slidably fitted inside the transfer trough. A channel is opened inside the slider. When the channel coincides with the transfer trough, the channel is connected to the transfer trough. A permanent magnet and an electromagnet are respectively installed at both ends of the switching trough. The slider is made of magnetic material. When the electromagnet is energized, the slider is attracted by the electromagnet, and the channel is connected to the transfer trough.

[0027] The oxygen mask is equipped with wires connected in series with an electromagnet. Each slide has contacts on both sides, and the wires connect all the contacts in series. The bottom of the slide rod is also equipped with a conductor. When there is no pressure change inside the oxygen mask, the conductor will connect the contacts in each slide, forming a closed circuit and energizing the electromagnet.

[0028] Beneficial effects: Initial state (end of exhalation / quiet period): The slide bar of the pressure-sensing mechanism is in its initial position under the action of the spring, and the conductor at its bottom connects the contacts in the slide groove. After all the contacts are connected in series with the wires, they form a closed circuit with the electromagnet. At this time, the electromagnet is energized and generates magnetic force.

[0029] Inhalation trigger: When the patient inhales, a negative pressure is generated inside the oxygen mask, causing the elastic diaphragm, base pad, and all slide bars to move synchronously towards the patient's face. This movement causes the conductor at the bottom of the slide bar to disengage from the contact point, resulting in the entire circuit being cut off, the electromagnet being de-energized, and the magnetic force disappearing.

[0030] Exhalation reset: When the patient exhales, the positive pressure inside the oxygen mask pushes the pressure-sensing mechanism to reset, the slide bar returns to its original position, the conductor reconnects the contacts, the circuit is closed again, and the electromagnet is energized again.

[0031] Exhalation state (electromagnet energized): The electromagnet generates magnetic force, attracting a slider made of magnetic material, causing it to slide to one end of the switching slot. At this time, the channel inside the slider is misaligned with the transfer slot, completely blocking the oxygen passage and stopping oxygen supply.

[0032] Inhalation state (electromagnet de-energized): The electromagnet's magnetic force disappears. At this time, the permanent magnet's magnetic force dominates, attracting the slider to the other end of the switching slot. The channel inside the slider aligns with the transfer slot, opening the oxygen passage and allowing oxygen to flow from the oxygen bag to the patient.

[0033] The system responds rapidly, opening the airway the instant inhalation begins and closing it the instant exhalation begins. This extremely high synchronization precision ensures that every unit of oxygen is delivered to the lungs when they need it most, virtually eliminating waste during the expiratory phase and maximizing oxygen utilization efficiency to near its theoretical maximum.

[0034] By directly using the mechanical displacement of the pressure-sensing mechanism as a circuit switch, complex electronic sensors and microprocessors are eliminated. This design cleverly utilizes the simple logic of "normal power on, inhalation power off" to achieve a control objective that is completely consistent with medical needs at the lowest cost and with the highest reliability.

[0035] Furthermore, the extrusion mechanism includes a pair of extrusion plates slidably connected in the storage tank. Each extrusion plate is provided with a nut seat, and a screw is threaded onto the nut seat. The nut seat is slidably connected to the storage tank. One end of the screw is rotatably connected to the storage tank, and the other end of the screw is axially provided with a driving component for driving the screw to rotate.

[0036] Beneficial effects: Two identical screw-nut seat mechanisms are symmetrically arranged, each driving one of the two compression plates. When the screw rotates in a specific direction (e.g., clockwise), the two compression plates move synchronously towards each other under the drive of the nut seat, evenly compressing the oxygen bag located in the middle from both sides and expelling the oxygen. When the screw rotates in the opposite direction, the compression plates move synchronously away from each other, making room for replacing the oxygen bag.

[0037] Through precision threaded transmission, the forward speed and position of the extrusion plate can be controlled with extreme precision, thereby achieving accurate and linear regulation of oxygen output flow.

[0038] Furthermore, it also includes a control unit; the transfer tank is also connected to a regulating valve and a flow meter. The control unit is used to control the operation of the regulating valve and the drive components based on the flow rate collected by the flow meter, and dynamically adjust the oxygen flow rate.

[0039] Beneficial effects: Users or healthcare professionals set a target oxygen flow rate via the control unit according to medical orders. The flow meter continuously and in real-time measures the actual oxygen flow rate in the system and transmits this data to the control unit. The control unit compares the actual flow rate measured by the flow meter with the preset target flow rate. If the actual flow rate is lower than the target, the control unit initiates an adjustment program; if it is higher than the target, it performs the opposite operation.

[0040] The control unit precisely controls the screw rotation by controlling the operation of the drive components, thereby altering the pressure of the compression plate on the oxygen bag. Simultaneously, the control unit adjusts the opening of the regulating valve installed in the transfer channel. This is a faster-responding fine-tuning mechanism used to quickly compensate for minute flow fluctuations caused by changes in the shape of the oxygen bag or instantaneous changes in the patient's inspiratory force.

[0041] The system combines a dual regulation mechanism of a squeeze plate (main adjustment) and a regulating valve (fine adjustment), enabling it to perform macroscopic, slow coarse adjustments throughout the entire oxygen supply cycle, as well as millisecond-level fine adjustments to the instantaneous flow demand generated during each breath.

[0042] Furthermore, it also includes a blood oxygen acquisition unit, which is used to collect the patient's blood oxygen status; the control unit is also used to adjust the oxygen flow rate based on the patient's blood oxygen status.

[0043] Beneficial effects: Medical staff can set an ideal target range for blood oxygen saturation in the control unit based on the patient's specific condition. The control unit continuously compares the measured SpO2 value from the blood oxygen acquisition unit with the target range. When the measured SpO2 falls below the lower limit of the target range, the control unit determines that there is hypoxia and automatically issues a command to increase the oxygen flow rate by controlling the drive components and regulating valves, thereby improving the patient's blood oxygen level.

[0044] When the measured SpO2 is higher than the upper limit of the target range, the control unit judges it as overoxygenation and will automatically reduce the oxygen flow rate to avoid the risks of hyperxemia.

[0045] When the measured SpO2 stabilizes within the target range, the system will maintain the current flow settings.

[0046] The entire adjustment process is gradual, smooth, and continuous, ensuring that the patient's blood oxygen level remains stable within the preset optimal range.

[0047] This solution can automatically adapt to the differences in oxygen consumption needs of different patients, different conditions, and different activity levels, providing the best oxygen therapy plan that is "personalized and time-dependent," thus achieving precise allocation of medical resources and maximizing treatment effectiveness.

[0048] Beneficial effects: The blood oxygen acquisition unit continuously and non-invasively monitors the patient's blood oxygen saturation (SpO2) and pulse signal, and transmits these physiological data to the control unit in real time.

[0049] Furthermore, the oxygen mask is also equipped with an air outlet, and several plates are rotatably connected to the inner circumference of the air outlet. When the plates are closed, a conical surface is formed on the outer side of the plates.

[0050] Beneficial effects: Inside the air outlet, multiple panels are rotatably connected by circumferentially arranged shafts. When there is no external force or the pressure inside and outside the mask is balanced, the panels tend to close under gravity or a pre-set small torque. At this time, their outer sides form a conical surface, which minimizes the effective ventilation cross-sectional area of ​​the air outlet.

[0051] When a patient exhales, the positive pressure airflow impacts the panels from the inside out, pushing all the panels to rotate and open synchronously in all directions until they are almost fully expanded, maximizing the cross-sectional area of ​​the air outlet. This provides a low-resistance, high-speed channel for the exhaled waste gas, allowing it to be quickly and completely expelled.

[0052] When the patient inhales, a negative pressure is created inside the mask, attracting outside air. At this moment, the velocity of the external airflow passing through the narrow gap between the conical surface and the outlet shell increases dramatically. According to Bernoulli's principle, this increased velocity leads to a decrease in the static pressure of the gas at that point, creating a suction effect on the outside of the panels. This, combined with the negative pressure inside the mask, pulls the panels closer together, minimizing the cross-sectional area for airflow. This significantly hinders the intake of outside air.

[0053] During the expiratory phase, the mask flaps open fully, providing maximum cross-sectional area for airflow, allowing exhaled air to escape at high speed without obstruction. This significantly reduces the work required for exhalation, effectively reducing respiratory fatigue and stuffiness inside the mask, thus improving comfort, especially beneficial for patients with respiratory insufficiency.

[0054] By automatically closing the panels to their minimum cross-sectional area during inhalation, this structure creates a high flow resistance barrier. This is not about achieving an absolute "seal," but rather about significantly impeding the airflow, ensuring that the majority of the inhaled gas comes from the high concentration of oxygen provided by the oxygen delivery system. This effectively prevents the oxygen from being diluted by the ambient air, thus ensuring the accuracy and effectiveness of oxygen therapy.

[0055] Furthermore, it also includes a switch acquisition unit and an alarm unit; LED flashing lights are connected in series on the wires, and the LED flashing lights are used to reflect the power supply status of the circuit as light signals; the switch acquisition unit is used to acquire the power-on-off frequency period and duty cycle; the alarm unit is used to output alarm signals; the control unit is also used to determine whether the oxygen supply status is normal based on the power-on-off frequency period and duty cycle of the switch acquisition unit, and to control the operation of the alarm unit.

[0056] Beneficial effect: The lead circuit is energized during exhalation and de-energized during inhalation. A flashing LED connected in series in the circuit directly translates this circuit state into a visible light signal: a lit LED indicates exhalation / electromagnet energized / valve closed, while an unlit LED indicates inhalation / electromagnet de-energized / valve open. This provides an intuitive primary status indication.

[0057] The switch acquisition unit continuously monitors the energization-de-energization signal of the conductor. It accurately records and calculates two key parameters:

[0058] Frequency cycle: One cycle of power on and one cycle of power off constitute a complete respiratory cycle. By calculating the number of cycles per unit time, the patient's real-time respiratory rate can be obtained.

[0059] Duty cycle: The ratio of the duration of electrical stimulation (expiration time) to the total duration of a respiratory cycle. This reflects the patient's inspiratory-to-expiratory ratio and is an important respiratory physiological parameter.

[0060] The control unit compares the real-time respiratory rate and duty cycle sent by the switch acquisition unit with the preset normal range (which can be set by medical staff).

[0061] Assessment of respiratory abnormalities: If the respiratory rate is too fast (shortness of breath), too slow (respiratory depression), or stops (apnea), or if the inspiratory-to-expiratory ratio is significantly abnormal, the control unit will determine that the patient's respiratory status is abnormal.

[0062] System fault diagnosis: If the circuit is continuously conducting (possibly due to a stuck pressure-sensing mechanism or severe leakage in the mask preventing the generation of negative pressure) or continuously disconnected (possibly due to a broken circuit or detachment of the pressure-sensing mechanism), the control unit will determine that the system is malfunctioning.

[0063] Once an abnormality is detected, the control unit immediately activates the alarm unit to send an alert to medical staff or the patient through sound, light, or vibration.

[0064] This solution cleverly utilizes existing control circuitry to continuously monitor a patient's respiratory rate and rhythm—key vital signs—without adding any additional sensors that come into contact with the patient. This enables the timely detection of dangerous situations such as respiratory arrest and hyperventilation, upgrading a single oxygen delivery device into a comprehensive device with respiratory monitoring capabilities.

[0065] This solution possesses self-diagnostic capabilities. It can distinguish between a patient's respiratory arrest and a malfunction in the device itself (such as the circuitry or pressure-sensing mechanism). For example, if the LED light is constantly on but there is no oxygen supply, it may indicate a fault in the electromagnet or slider; if the LED light is off but the patient is struggling to breathe, it may indicate a stuck pressure-sensing mechanism or a broken circuit. This precise fault location capability greatly facilitates equipment maintenance and troubleshooting, ensuring reliable operation.

[0066] The LED flashing lights provide healthcare professionals with a readily identifiable indication of the system's operational status, eliminating the need for instruments. The flashing rhythm is synchronized with the patient's breathing rhythm, offering a highly intuitive and reassuring feedback. Simultaneously, the switch acquisition unit performs precise yet discreet data analysis, collectively contributing to a superior human-computer interaction experience.

[0067] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0068] Figure 1 This is a three-dimensional structural schematic diagram of the portable oxygen delivery device for nursing care according to the present invention;

[0069] Figure 2 for Figure 1 Top view of a portable oxygen delivery device for nursing care;

[0070] Figure 3 for Figure 2 Sectional view along the AA direction;

[0071] Figure 4 for Figure 1 Enlarged view of a portion of point M in the middle;

[0072] Figure 5 for Figure 3 A magnified view of a portion of point N in the middle;

[0073] Figure 6 for Figure 3 A magnified view of a portion of point O in the middle.

[0074] The reference numerals in the accompanying drawings of the instruction manual include: 1. Oxygen box; 2. Oxygen mask; 3. Oxygen tubing; 101. Cover plate; 102. Handle; 103. Oxygen bag; 104. Storage tank; 105. Extrusion plate; 106. Switching tank; 107. Electromagnet; 108. Permanent magnet; 109. Transfer tank; 110. Slider; 111. Channel; 112. Regulating valve; 113. Nut seat; 114. Screw; 201. Air outlet; 202. Composite plate; 203. Elastic membrane; 204. Base pad; 205. Slide rod; 206. Conductor; 207. Wire; 208. Spring; 301. Tesla valve. Detailed Implementation

[0075] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0076] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0077] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0078] The following detailed description illustrates the specific implementation method:

[0079] Example 1:

[0080] As attached Figures 1-6 The illustration shows a portable oxygen delivery device for nursing care, comprising an oxygen delivery mechanism and an oxygen mask 2. The oxygen delivery mechanism is connected to the oxygen mask 2 and is used to deliver oxygen to the oxygen mask 2. Preferably, the oxygen delivery mechanism includes an oxygen delivery box 1, which has a storage compartment 104. Preferably, a cover plate 101 is rotatably connected to the top of the storage compartment 104, and a handle 102 is welded and fixed to the cover plate 101 to facilitate lifting and placing by the user. An oxygen bag 103 and a compression mechanism are provided in the storage compartment 104. The oxygen bag 103 is connected to the oxygen mask 2, and the compression mechanism is used to compress the oxygen bag 103.

[0081] Preferably, the oxygen mask 2 also has an air outlet 201, combined with the attached... Figure 1 Appendix Figure 3 and attached Figure 4As shown, in this embodiment, a pair of air outlets 201 are provided, which are located on both sides of the nose of the oxygen mask 2. Several plates 202 are circumferentially connected inside the air outlets 201. When the plates 202 are closed, a conical surface is formed on the outer side of the plates 202, and the conical surface gradually reduces the opening of the air outlets 201.

[0082] Preferably, an oxygen supply tube 3 is connected between the oxygen mask 2 and the oxygen bag 103. A Tesla valve 301 is connected to the end of the oxygen supply tube 3 near the oxygen mask 2. The Tesla valve 301 is used to prevent the gas in the oxygen mask 2 from flowing back into the oxygen supply tube 3.

[0083] Specifically, the extrusion mechanism includes a pair of extrusion plates 105 slidably connected within the storage tank 104. Nut seats 113 are welded and fixed to both ends of each extrusion plate 105. In this embodiment, the threads within the nut seats 113 are symmetrically arranged, and each nut seat 113 is threadedly fitted with a screw 114. When the screw 114 rotates, the nut seats 113 move towards or away from each other. The nut seats 113 are slidably fitted to one side of the bottom of the storage tank 104. One end of the screw 114 is rotatably connected to the storage tank 104, and the other end of the screw 114 is axially equipped with a driving component. The driving component is a stepper motor, and the output shaft of the stepper motor is fixedly connected to the screw 114 via a coupling.

[0084] The oxygen mask 2 is equipped with a pressure-sensing mechanism that responds to changes in pressure within the oxygen mask 2. Specifically, the pressure-sensing mechanism includes several grooves formed on the inner side of the oxygen mask 2. Preferably, the grooves are arranged in an array on the inner side of the oxygen mask 2, in conjunction with an attached... Figure 5 As shown, each slide rod 205 is slidably connected within the slide groove. Springs 208 are bonded and fixed between each slide rod 205 and the inner wall of the slide groove. The springs 208 support the slide rods 205, keeping them in a reference position. Base pads 204 are bonded and fixed to the ends of each slide rod 205 away from the slide groove. An elastic membrane 203, made of silicone rubber, covers the base pads 204. The elastic membrane 203 is bonded and fixed to all the base pads 204, covering all the base pads 204 inside the oxygen mask 2.

[0085] An adaptive opening and closing mechanism is provided on the communication path between the oxygen mask 2 and the oxygen delivery mechanism. This mechanism controls the connection between the oxygen mask 2 and the oxygen bag 103 based on the response information from the pressure-sensing mechanism. Specifically, the adaptive opening and closing mechanism includes a transfer slot 109 and a switching slot 106 located within the oxygen delivery box 1, in conjunction with the attached... Figure 6As shown, the left and right ends of the transfer trough 109 are connected to the oxygen delivery tube 3 and the oxygen bag 103, respectively. Preferably, in this embodiment, the oxygen bag 103 and the transfer trough 109 are detachably connected via a quick connector. The switching trough 106 vertically penetrates the transfer trough 109. A slider 110 is slidably fitted inside the transfer trough 109. A channel 111 is opened inside the slider 110. When the channel 111 coincides with the transfer trough 109, the channel is connected to the transfer trough 109. A permanent magnet 108 and an electromagnet 107 are respectively embedded in both ends of the switching trough 106. The slider 110 is made of magnetic material. When the electromagnet 107 is energized, the slider 110 is attracted by the electromagnet 107, that is, the magnetic force generated by the electromagnet 107 is greater than the magnetic force generated by the permanent magnet 108. The channel 111 is connected to the transfer trough 109. Preferably, the transfer trough 109 is also connected to a regulating valve 112 and a flow meter. The regulating valve 112 is used to regulate the oxygen flow rate, and the flow meter is used to monitor the oxygen flow rate.

[0086] Combined with appendix Figure 5 As shown, the oxygen mask 2 is embedded with a wire 207, which is connected in series with the electromagnet 107 (including a power supply). Contacts are welded and fixed on both sides of each slide. The wire 207 connects all contacts in series. Conductors 206 are also welded and fixed to the bottom of the slide rod 205. When there is no pressure change inside the oxygen mask 2, the conductors 206 conduct the contacts in each slide, and the wire 207 forms a closed circuit, energizing the electromagnet 107.

[0087] Preferably, it also includes a control unit; the control unit is used to control the operation of the regulating valve 112 and the drive unit (stepper motor) based on the flow rate collected by the flow meter, and dynamically adjust the oxygen flow rate.

[0088] Preferably, it also includes a blood oxygen acquisition unit, which is used to collect the patient's blood oxygen status. In this embodiment, the blood oxygen acquisition unit is a finger-clip pulse oximeter. The control unit is also used to adjust the oxygen flow rate based on the patient's blood oxygen status.

[0089] Preferably, the system also includes a switch acquisition unit and an alarm unit; an LED flashing light is connected in series on the wire 207, which is used to reflect the power supply status of the circuit as a light signal, so that medical personnel can check the patient's breathing status. The switch acquisition unit is used to acquire the power-on / power-off frequency period and duty cycle. Preferably, in this embodiment, the switch acquisition unit is a voltage transformer connected in series on the wire 207. The alarm unit is used to output an alarm signal. Preferably, the alarm unit is a combination of a buzzer and an alarm light. The control unit is also used to determine whether the oxygen supply status is normal based on the power-on / power-off frequency period and duty cycle of the switch acquisition unit, and to control the operation of the alarm unit.

[0090] The specific implementation process is as follows:

[0091] Open the cover 101, place the oxygen bag 103 filled with oxygen into the storage slot 104 of the oxygen delivery box 1, between a pair of compression plates 105, and then close the cover 101.

[0092] Power on the system (e.g., connect the built-in battery or external power source) and start the control unit.

[0093] Medical staff set the target oxygen flow rate and / or target blood oxygen saturation range through the control unit.

[0094] Wear the oxygen mask 2 tightly on the patient's face, ensuring that the elastic membrane 203 fits well against the facial skin to form a seal.

[0095] The pulse oximeter (finger clip pulse oximeter) is worn on the patient's finger.

[0096] At this time, the patient is in the end-expiratory phase or in a quiet breathing period, and the pressure inside the oxygen mask 2 is close to the ambient pressure. Under the action of the spring 208, the conductor 206 at the bottom of the slide bar 205 conducts the contacts in the slide groove, forming a closed circuit in the wire 207. The electromagnet 107 in this circuit is energized to generate magnetic force, attracting the slider 110 to move, causing its internal channel 111 to misalign with the transfer slot 109, thereby closing the oxygen passage. At the same time, the LED flashing light in the circuit lights up due to the circuit conduction, visually indicating that the system is in the "expiratory standby" state.

[0097] Inspiratory phase:

[0098] The patient begins to inhale, creating negative pressure inside oxygen mask 2.

[0099] Pressure sensing and signal triggering: Negative pressure is applied to the large-area elastic membrane 203, causing all the base pads 204 and the slide bar 205 to move synchronously towards the inside of the mask, overcoming the force of the spring 208. The conductor 206 at the bottom of the slide bar 205 then disengages from the contact point, causing the circuit of the wire 207 to be de-energized.

[0100] Valve action: After the circuit is de-energized, the magnetism of electromagnet 107 disappears. At this time, the permanent magnet 108 at the other end of the switching slot 106 dominates the magnetic force, attracting the magnetic slider 110 to the corresponding position, so that the channel 111 inside the slider 110 is aligned with the transfer slot 109, and the oxygen passage is opened.

[0101] Oxygen delivery: According to the preset target, the control unit controls the stepper motor (drive component) to rotate the screw 114, driving the two side extrusion plates 105 to move towards each other, extruding the oxygen bag 103; at the same time, the regulating valve 112 opens to the appropriate position. Under stable pressure, oxygen flows sequentially through the oxygen bag 103, the transfer tank 109 (at this time, the channel 111 is already open), the oxygen delivery tube 3, the Tesla valve 301, and finally enters the oxygen mask 2 for the patient to inhale.

[0102] Status indication: Since the circuit is open during the intake phase, the LED flashing light is off, and electromagnet 107 is de-energized. The "off" status of the LED light visually indicates that the system is in the "intake and oxygen supply" stage.

[0103] Exhalation port status: During the inhalation phase, external air flows through the narrow conical slit formed by the outlet 201 and the plate 202, generating a Venturi effect that adsorbs and gathers the plate 202, keeping the cross-sectional area of ​​the outlet 201 to a minimum, effectively preventing a large influx of external air from diluting the oxygen concentration.

[0104] Expiratory phase:

[0105] The patient begins to exhale, creating positive pressure inside oxygen mask 2.

[0106] Pressure sensing and signal reset: Positive pressure pushes the elastic diaphragm 203, base pad 204 and slide bar 205 to reset, the conductor 206 at the bottom of slide bar 205 re-contacts and connects the contacts, and the circuit of wire 207 is restored to power.

[0107] Valve action: When the electromagnet 107 is energized again, it generates magnetic force, which overcomes the magnetic force of the permanent magnet 108 and attracts the slider 110 back to its original position, causing the internal channel 111 to be misaligned with the transfer tank 109 again, thereby closing the oxygen passage and stopping the oxygen supply.

[0108] Status indication: When the circuit is on, the LED flashing light illuminates, visually indicating that the system has returned to the "exhalation oxygen deprivation" state.

[0109] Exhalation port status: The exhaled positive pressure exhaust gas pushes open the hinge plate 202 of the exhaust port 201 from the inside, causing it to rotate and open (like a flower petal blooming). The cross-sectional area of ​​the exhaust port 201 reaches its maximum, and the exhaust gas is quickly discharged from the mask with extremely low resistance.

[0110] Throughout the process, the flow meter monitors the oxygen flow rate in real time and feeds the data back to the control unit. The control unit compares the measured flow rate with the target flow rate and dynamically fine-tunes the stepper motor speed (changing the pressure of the extrusion plate 105) and the opening of the regulating valve 112 to ensure that the flow rate remains stable at the set value.

[0111] The pulse oximetry unit continuously monitors the patient's oxygen saturation (SpO2) and feeds it back to the control unit. The control unit compares this value with a preset target range. If SpO2 is lower than the target, the target oxygen flow rate is automatically increased; if SpO2 is higher than the target, it is automatically decreased, achieving individualized and intelligent treatment.

[0112] The switch acquisition unit (voltage transformer) continuously monitors the on / off signal of the 207 circuit and calculates the patient's real-time respiratory rate (based on the on / off frequency cycle) and inspiratory-to-expiratory ratio (based on the duty cycle).

[0113] The control unit continuously analyzes these parameters. Once an abnormal respiratory rate (too fast, too slow, or paused), a significantly abnormal inspiratory-to-expiratory ratio, or a fault state such as continuous conduction / disconnection of the circuit is detected, the alarm unit (buzzer and alarm light) is immediately activated to send an audible and visual alarm signal to medical staff, indicating that the patient's breathing is abnormal or that the system is malfunctioning.

[0114] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A portable oxygen delivery device for nursing care, comprising an oxygen delivery mechanism and an oxygen mask (2); the oxygen delivery mechanism is connected to the oxygen mask (2), and the oxygen delivery mechanism is used to deliver oxygen to the oxygen mask (2); characterized in that, The oxygen mask (2) is equipped with a pressure-sensing mechanism for responding to pressure changes inside the oxygen mask (2). An adaptive opening and closing mechanism is provided on the communication path between the oxygen mask (2) and the oxygen delivery mechanism. The adaptive opening and closing mechanism is used to control the connection and disconnection between the oxygen mask (2) and the oxygen delivery mechanism based on the response information of the pressure-sensing mechanism.

2. The portable oxygen delivery device for nursing care according to claim 1, characterized in that, The oxygen delivery mechanism includes an oxygen delivery box (1), a storage tank (104) is provided inside the oxygen delivery box (1), an oxygen bag (103) and a squeezing mechanism are provided inside the storage tank (104), the oxygen bag (103) is connected to the oxygen mask (2), and the squeezing mechanism is used to squeeze the oxygen bag (103).

3. The portable oxygen delivery device for nursing care according to claim 2, characterized in that, The pressure sensing mechanism includes several sliding grooves opened inside the oxygen mask (2). Each sliding groove is slidably connected to a sliding rod (205). A spring (208) is provided between the sliding rod (205) and the inner wall of the sliding groove. The two ends of the spring (208) are fixedly connected to the inner wall of the sliding groove and the sliding rod (205) respectively. A base pad (204) is provided at the end of the sliding rod (205) away from the sliding groove. An elastic membrane (203) is provided between the base pads (204). The elastic membrane (203) covers all the base pads (204) inside the oxygen mask (2).

4. The portable oxygen delivery device for nursing care according to claim 3, characterized in that, An oxygen supply tube (3) is connected between the oxygen mask (2) and the oxygen bag (103). A Tesla valve (301) is connected to the end of the oxygen supply tube (3) near the oxygen mask (2). The Tesla valve (301) is used to prevent the gas in the oxygen mask (2) from flowing back into the oxygen supply tube (3).

5. The portable oxygen delivery device for nursing care according to claim 4, characterized in that, The adaptive opening and closing mechanism includes a transfer trough (109) and a switching trough (106) located inside the oxygen supply box (1). The two ends of the transfer trough (109) are connected to the oxygen supply pipe (3) and the oxygen bag (103), respectively. The switching trough (106) passes through the transfer trough (109). A slider (110) is slidably fitted inside the transfer trough (109). A channel (111) is opened inside the slider (110). When the channel (111) coincides with the transfer trough (109), the channel is connected to the transfer trough (109). A permanent magnet (108) and an electromagnet (107) are respectively installed at both ends of the switching trough (106). The slider (110) is made of magnetic material. When the electromagnet (107) is energized, the slider (110) is attracted by the electromagnet (107), and the channel (111) is connected to the transfer trough (109). The oxygen mask (2) is equipped with wires (207), which are connected in series with the electromagnet (107). Each slide has contacts on both sides, and the wires (207) connect all the contacts in series. The bottom of the slide rod (205) is also equipped with conductors (206). When there is no pressure change in the oxygen mask (2), the conductors (206) connect the contacts in each slide, the wires (207) form a closed circuit, and the electromagnet (107) is energized.

6. The portable oxygen delivery device for nursing care according to claim 5, characterized in that, The extrusion mechanism includes a pair of extrusion plates (105) slidably connected in the storage tank (104). Each extrusion plate (105) is provided with a nut seat (113). A screw (114) is threadedly fitted on the nut seat (113). The nut seat (113) is slidably fitted with the storage tank (104). One end of the screw (114) is rotatably connected to the storage tank (104). The other end of the screw (114) is axially provided with a driving member, which is used to drive the screw (114) to rotate.

7. The portable oxygen delivery device for nursing care according to claim 6, characterized in that, It also includes a control unit; the transfer tank (109) is also connected to a regulating valve (112) and a flow meter. The control unit is used to control the operation of the regulating valve (112) and the drive unit based on the flow rate collected by the flow meter, and dynamically adjust the oxygen flow rate.

8. The portable oxygen delivery device for nursing care according to claim 7, characterized in that, It also includes a blood oxygen acquisition unit, which is used to collect the patient's blood oxygen status; the control unit is also used to adjust the oxygen flow rate based on the patient's blood oxygen status.

9. The portable oxygen delivery device for nursing care according to claim 8, characterized in that, The oxygen mask (2) is also provided with an air outlet (201). Several plates (202) are rotatably connected to the inner circumference of the air outlet (201). When the plates (202) are closed, a cone surface is formed on the outer side of the plates (202).

10. The portable oxygen delivery device for nursing care according to claim 9, characterized in that, It also includes a switch acquisition unit and an alarm unit; LED flashing lights are connected in series on the wire (207), and the LED flashing lights are used to reflect the power supply status of the circuit as light signals; the switch acquisition unit is used to acquire the power-on-off frequency period and duty cycle; the alarm unit is used to output alarm signals; the control unit is also used to determine whether the oxygen supply status is normal based on the power-on-off frequency period and duty cycle of the switch acquisition unit, and to control the operation of the alarm unit.

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