Multivariable coupling oxygen cylinder time-use rapid calculation disc and calculation method

Abstract

The invention relates to the technical field of medical equipment, in particular to a multivariable coupling oxygen cylinder time-use rapid calculation disc and calculation method. The computing disk comprises a bottom-layer disk, a middle-layer disk and a top-layer disk which are sequentially arranged from bottom to top; oxygen concentration scales on the outer ring, available time scales on the middle ring and oxygen consumption rate scales on the inner ring are arranged on the bottom-layer disc; flow / minute ventilation capacity scales corresponding to the oxygen concentration scales, an available time indicating frame corresponding to the available time scales and an oxygen consumption rate indicating frame corresponding to the oxygen consumption rate scales are arranged on the middle layer disc, and an oxygen consumption rate indicating arrow protruding inwards is arranged in the oxygen consumption rate indicating frame; oxygen bottle pressure scales corresponding to the oxygen consumption rate scales and an available time indicating arrow are arranged on the top layer disc. According to the calculation disc, through a mechanical structure and a scale alignment mechanism, the calculation process is simplified, rapid and accurate time estimation under multiple oxygen inhalation modes is achieved, and therefore the clinical operation reliability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical equipment, in particular to a multi-variable coupled time fast calculation disc for oxygen cylinders and a calculation method. BACKGROUND

[0002] The oxygen reserve in the human body is limited, and the tissue cells rely on the continuous supply of oxygen by the circulatory system to maintain aerobic metabolism. Once the supply of oxygen stops, the human body can only maintain life for no more than 5 minutes. Therefore, effective oxygen therapy plays an important role in maintaining the metabolism of the body and the treatment of diseases, especially in the treatment and transportation of critically ill patients.

[0003] Critically ill patients often need to be transported in and out of the hospital for further examination, surgery or treatment due to the complexity of their condition, in order to clarify the diagnosis and obtain more effective treatment. In order to ensure the supply of oxygen during transportation, oxygen cylinders are essential, and continuous and sufficient supply of oxygen is the lifeline of safe transportation. If the pressure in the oxygen cylinder is insufficient during transportation by medical staff, it will lead to oxygen deficiency in the patient's whole body, causing damage to the patient's organ function and irreversible effects, and even life-threatening in severe cases. Therefore, during the transportation of critically ill patients (especially mechanically ventilated patients) in and out of the hospital, accurate estimation of the remaining available time of the oxygen cylinder is a key link to ensure the safety of the patient during transportation.

[0004] Currently, clinical medical staff generally rely on mental or pen calculation to calculate the remaining available time of the oxygen cylinder, and the calculation formula is complex. For patients inhaling oxygen from an oxygen cylinder with a nasal catheter or a mask, the calculation of the remaining available time of the oxygen cylinder involves two variables, the pressure of the oxygen cylinder and the inhaled oxygen flow. For patients inhaling high-flow oxygen through the nose, the calculation of the available time involves three variables, the pressure of the oxygen cylinder, the oxygen flow and the oxygen concentration. For mechanically ventilated patients, it involves four variables, the pressure of the oxygen cylinder, the patient's breathing rate, the tidal volume and the oxygen concentration. This calculation method is complicated and complex, and during transportation, the patient's condition needs to be adjusted at any time, so the calculation is prone to error. Once the calculation is wrong and the oxygen is exhausted during the journey, it will cause serious medical safety accidents. The existing technology is only for patients inhaling oxygen through a nasal catheter or a mask, and the calculation time cannot be accurately calculated to the minute, and the evaluation tools for mechanically ventilated and high-flow oxygen patients are still blank. In addition, the existing methods and technologies do not provide a unified calculation framework that can adapt to different specifications (such as 5 liters, 10 liters, 15 liters, etc.) of oxygen cylinders, resulting in repeated and tedious calculations for different bottle bodies in clinical applications, low efficiency and easy to make mistakes.

[0005] Therefore, the prior art has the following problems: manual calculation is prone to human errors due to the involvement of multiple nonlinear variables in the calculation formula, resulting in estimated results deviating from the actual values and affecting the continuity of oxygen supply. Moreover, due to the need to solve the problem of nonlinear coupling of variable relationships and scale design, it is technically difficult to integrate the calculation formulas of multiple oxygen inhalation modes into a single tool. Secondly, the calculation process is time-consuming and cannot quickly respond to parameter adjustments when the patient's condition changes, reducing the efficiency of the transfer. In addition, the existing tools cover limited oxygen inhalation modes and cannot adapt to different scenarios such as nasal cannula, face mask, nasal high flow, and mechanical ventilation at the same time, lacking a unified calculation framework. At the same time, the existing technical solutions are bound to specific oxygen cylinder volumes, lack of universality, and cannot flexibly cope with the complex scene of multiple specifications of oxygen cylinders in clinical use. SUMMARY

[0006] In view of the deficiencies of the prior art, the purpose of the embodiments of the present application is to provide a multi-variable coupled oxygen cylinder time quick calculation disc and a calculation method, which simplifies the calculation process through mechanical structure and scale alignment mechanism, realizes fast and accurate time estimation under multiple oxygen inhalation modes and multiple oxygen cylinder specifications, and improves the reliability of clinical operation.

[0007] In order to achieve the above-mentioned purpose, the embodiments of the present application provide the following technical solutions: A multi-variable coupled oxygen cylinder time quick calculation disc, comprising a bottom disc, a middle disc and a top disc arranged in order from bottom to top, and the diameters are decreasing in order, wherein the middle disc and the top disc are rotationally installed on the bottom disc; the bottom disc is provided with an oxygen concentration scale with an outer ring, an available time scale with a middle ring and an oxygen consumption rate scale with an inner ring; the middle disc is provided with a flow / minute ventilation scale corresponding to the oxygen concentration scale, an available time indication box corresponding to the available time scale, and an oxygen consumption rate indication box corresponding to the oxygen consumption rate scale, and the oxygen consumption rate indication box has an inwardly protruding oxygen consumption rate indication arrow; the top disc is provided with an oxygen cylinder pressure scale corresponding to the oxygen consumption rate scale, and an available time indication arrow.

[0008] The present application is based on the gas law, the working principle of high flow device and the working principle of breathing machine, and the remaining available time calculation formula of oxygen cylinder is as follows: T=V×P×10 / oxygen flow for patients inhaling oxygen through nasal cannula or face mask connected to oxygen cylinder. T=V×P×10 / [oxygen flow×(FiO2-0.21) / 0.79] for patients inhaling oxygen through nasal high flow. T=V×P×10 / [MV×(FiO2-0.21) / 0.79] for patients on mechanical ventilation, wherein T is the remaining available time of oxygen cylinder (min), V is the water volume of oxygen cylinder (L), P is the current pressure of oxygen cylinder (MPa), MV is the minute ventilation (L / min), FiO2 is the oxygen inhalation concentration (%), and the constant 10 represents 1 MPa is equal to 10 standard atmospheres.

[0009] Optionally, the oxygen concentration scale range is 30% to 100%, and the 0° counterclockwise corresponding angle is 0° to 163.38°.

[0010] Optionally, the available time scale range is 20 min to 2000 min, and the 0° clockwise corresponding angle is -30.29° to 313.83°.

[0011] Optionally, the oxygen consumption rate scale ranges from 0.3 L / min to 35 L / min, and the 0° counterclockwise angle corresponds to -172.08° to 183.61°.

[0012] Optionally, the flow rate / minute ventilation scale ranges from 3L to 80L, and the 0° clockwise corresponding angle is from 0° to 245.39°.

[0013] Optionally, the oxygen consumption rate indicator arrow is aligned with the flow rate / minute ventilation scale of 12L.

[0014] Optionally, the oxygen cylinder pressure scale range is 3MPa to 16MPa, and the 0° counterclockwise corresponding angle is 0° to 125.10°.

[0015] Optionally, the available time indicator arrow is on the same straight line as the oxygen cylinder pressure scale 10MPa, and is located on both sides of the center.

[0016] The scale layout of the calculation disk is derived based on the aforementioned general formula. By internalizing the V-parameter of a specific oxygen cylinder (e.g., a 10L oxygen cylinder) into a non-uniform scale system, visualization of multivariate coupling relationships is achieved. Those skilled in the art can design corresponding scale systems based on the same principle for different oxygen cylinder specifications, all of which fall within the protection scope of this invention.

[0017] This invention also provides a calculation method for the multivariate coupled oxygen cylinder usage time calculation panel as described above, for patients receiving high-flow oxygen therapy or mechanical ventilation: Rotate the middle layer disc to align the flow rate / minute ventilation scale on the middle layer disc with the oxygen concentration scale on the bottom layer disc, so that the oxygen consumption rate indicator arrow on the middle layer disc indicates the oxygen consumption rate corresponding to the oxygen consumption rate scale on the bottom layer disc. The flow rate is read by a high-flow instrument, the minute ventilation is read by a ventilator, and the oxygen concentration is read by a high-flow instrument or a ventilator. Rotate the top plate to align the oxygen cylinder pressure scale on the top plate with the oxygen consumption rate scale indicated in the previous step. This will cause the available time indicator arrow on the top plate to indicate the available time corresponding to the available time scale on the bottom plate, thus obtaining the available time of the oxygen cylinder. The oxygen cylinder pressure is read from the oxygen cylinder.

[0018] Optionally, for patients receiving oxygen via nasal cannula or face mask: rotate the top plate to align the oxygen cylinder pressure scale on the top plate with the oxygen consumption rate scale, so that the available time indicator arrow on the top plate indicates the available time corresponding to the available time scale on the bottom plate, thus obtaining the available time of the oxygen cylinder. Here, the oxygen consumption rate scale is the inhaled oxygen flow rate, which is read through the flow meter, and the oxygen cylinder pressure is read through the oxygen cylinder.

[0019] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages: 1. The calculation disk of this invention adopts a three-layer stacked disk design, with the bottom disk, middle disk, and top disk arranged sequentially from bottom to top, and their diameters decreasing, facilitating layered operation and visual reading for the user. The middle and top disks are rotatably mounted on the bottom disk, allowing the user to align different scales through rotation. The oxygen concentration scale, available time scale, and oxygen consumption rate scale on the bottom disk are located on the outer, middle, and inner rings, respectively. This layout coordinates with the flow rate / minute ventilation scale, available time indicator, and oxygen consumption rate indicator on the middle disk, as well as the oxygen cylinder pressure scale and available time indicator arrow on the top disk. The rotational connections and scale correspondences between the various layers of the discs enable the visualization and mechanization of multivariate coupled calculations. This solves the problems of errors and inefficiency caused by relying on mental calculations or written calculations in clinical practice. The calculation formulas are visualized and mechanized. The remaining available time of the oxygen cylinder is presented through a mechanical structure of three-layer turntables and two-stage coupled calculations. The variable scales required for nasal cannula oxygen inhalation, face mask oxygen inhalation, high-flow nasal cannula oxygen inhalation, and mechanical ventilation are integrated into one unit. The operation is simple, the results are accurate, and no electricity is required. Medical staff can obtain reliable results quickly within seconds, with results accurate to the minute, ensuring the safety of patient transport.

[0020] 2. Complex multivariate nonlinear calculation formulas are visualized on a turntable using a precise non-uniform logarithmic scale system, realizing formula turntableization and calculation alignment. Users do not need to understand complex formulas; they can obtain accurate results within seconds with just two simple rotation alignment operations.

[0021] 3. After using this calculator, the estimation time has been reduced from an average of 3-5 minutes (including calculation and verification) to 15-30 seconds, an increase of over 90%. Using this calculator reduces the potential error rate of mental calculation, eliminates the situation of oxygen cylinders running out during transport, significantly improves safety, and greatly reduces the psychological burden on nurses.

[0022] 4. Based on a universal formula, this invention allows for the rapid design of a calculation disk applicable to oxygen cylinders of any volume, such as 5 liters, 10 liters, and 15 liters, by adjusting parameters internalized in the scale. This overcomes the limitations of existing technologies that are tied to a single cylinder size, and has extremely high clinical applicability and promotional value.

[0023] Advantages of additional aspects of the invention will be set forth 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

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In addition, the dimensions or spacing between the components are exaggerated to show the position of each component, and the schematic diagrams are for illustrative purposes only.

[0025] Figure 1 This is a schematic diagram of the overall computing disk provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the underlying disk provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the middle layer disk provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the top-level disk provided in an embodiment of the present invention; In the diagram: 1. Bottom layer; 2. Middle layer; 3. Top layer; Detailed Implementation It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0026] Example 1 Oxygen consumption rate (OCR) is the amount of oxygen consumed from the oxygen cylinder per minute. For patients receiving oxygen via nasal cannula / mask, OCR is determined by the inhaled oxygen flow rate; that is, OCR is equal to the inhaled oxygen flow rate. An inhaled oxygen flow rate is set when using a nasal cannula / mask. For patients receiving high-flow nasal cannula oxygen, OCR is determined by the set oxygen flow rate and oxygen concentration. Both oxygen flow rate and oxygen concentration are set when using high-flow nasal cannula oxygen. For mechanically ventilated patients, OCR is determined by the set minute ventilation and oxygen concentration. Minute ventilation = respiratory rate × tidal volume. Three parameters are set during mechanical ventilation: oxygen concentration, respiratory rate, and tidal volume. The minute ventilation value is also displayed on the ventilator monitoring interface.

[0027] To illustrate the technical solution of this invention in detail, a typical 10L oxygen cylinder will be used as an example below. It should be understood that this is not intended to limit the scope of the invention.

[0028] Based on the general formula, with the parameter V=10L fixed in this example, the formula can be simplified as follows: For patients receiving oxygen via nasal cannula or mask connected to an oxygen cylinder: T=P×100 / oxygen flow rate. For patients receiving high-flow nasal cannula oxygen: T=P×100 / [oxygen flow rate×(FiO2-0.21) / 0.79]. For mechanically ventilated patients: T=P×100 / [MV×(FiO2-0.21) / 0.79].

[0029] like Figure 1 As shown, the multivariable coupled oxygen cylinder time-accelerating calculation disk includes a bottom disk 1, a middle disk 2 and a top disk 3 arranged sequentially from bottom to top, with the diameter decreasing sequentially. The middle disk 2 and the top disk 3 are rotatably mounted on the bottom disk 1.

[0030] like Figure 2 As shown, the bottom disk 1 has an outer ring of oxygen concentration scale, a middle ring of available time scale, and an inner ring of oxygen consumption rate scale; as Figure 3 As shown, the middle layer disk 2 is provided with a flow rate / minute ventilation scale corresponding to the oxygen concentration scale, an available time indicator box corresponding to the available time scale, and an oxygen consumption rate indicator box corresponding to the oxygen consumption rate scale. The oxygen consumption rate indicator box has an inwardly protruding oxygen consumption rate indicator arrow; as shown... Figure 4 As shown, the top plate 3 is provided with an oxygen cylinder pressure scale corresponding to the oxygen consumption rate scale, as well as an arrow indicating the available time.

[0031] The calculation disk employs a three-tiered structure: a bottom disk 1, a middle disk 2, and a top disk 3, arranged sequentially from bottom to top with decreasing diameters. The middle disk 2 and top disk 3 are rotatably mounted on the bottom disk 1. This three-layered, rotatable connection allows relative movement between layers to achieve scale alignment. The outer ring of the oxygen concentration scale, the middle ring of the available time scale, and the inner ring of the oxygen consumption rate scale on the bottom disk 1 correspond to the core variables required for calculating the available time of the oxygen cylinder, providing basic scale support for multivariate coupled calculations. The flow rate / minute ventilation scale on the middle disk 2, corresponding to the oxygen concentration scale, can work in conjunction with the oxygen concentration scale on the bottom disk 1 to perform the first step of variable conversion. The available time indicator and oxygen consumption rate indicator are used to assist in reading the available time and oxygen consumption rate, respectively, with the oxygen consumption rate indicator arrow pointing directly to the oxygen consumption rate scale on the bottom disk 1. The oxygen cylinder pressure scale on the top panel 3, corresponding to the oxygen consumption rate scale, can be used in conjunction with the oxygen consumption rate scale on the bottom panel 1 to achieve the second step of variable conversion. The available time indicator arrow points directly to the available time scale on the bottom panel 1 to obtain the result. The synergistic effect of each layer integrates the variable scales required for nasal cannula oxygen therapy, face mask oxygen therapy, high-flow nasal cannula oxygen therapy, and mechanical ventilation into one, solving the problem of the lack of comprehensive assessment tools in existing technologies. At the same time, the mechanical structure enables variable alignment calculation, avoiding calculation errors caused by numerous variables and complex formulas when performing mental or written calculations. This provides a structural basis for the accuracy of oxygen supply during patient transport.

[0032] The specific numerical range of the scale is as follows: oxygen concentration: 30%~100%, flow rate / minute ventilation: 3L / min~80L / min, oxygen cylinder pressure: 3MPa~16MPa.

[0033] Rotary Scale Calculation: The formula for calculating the remaining usable time of an oxygen cylinder is complex, involving many variables and non-linear relationships. It's impossible to obtain a value through a single rotation of the rotary scale. When the variables are simplified to oxygen cylinder pressure and oxygen consumption rate, time = pressure × 100 / oxygen consumption rate. Their relationship with time is completely linear, which is a prerequisite for creating a rotary calculation disk. First, the scale positions of the upper and lower rotary disks are created. Because the relationship is linear, a logarithmic scale can be used to create the rotary disk. On a logarithmic scale disk, multiplication and division become addition and subtraction of scales, which can be calculated by rotation. Core calculation principle: T = 100 × P / R is equivalent to Log(T) = Log(100) + Log(P) - Log(R). During rotation, the scales of Log(P) and Log(R) are actually aligned, and the difference corresponds to Log(T), thus allowing the time T to be read on the fixed disk.

[0034] Calculation of the scale range and angle for each layer and circle: Upper turntable: Oxygen cylinder pressure ring (P). Set the angle of scales 3 to 10 on the upper turntable to 90°, with scale 3 at 0° and scale 10 at 90°. Pressure range: 3MPa to 16MPa. The available time indicator arrow should be aligned with the oxygen cylinder pressure scale 10MPa, and located on opposite sides of the center.

[0035] Calculation formula: Angle = [Log(P) - Log(3)] / [Log(10) - Log(3)] × 90°.

[0036] Table of key pressure values ​​and their corresponding angles:

[0037] Bottom fixed plate (inner ring): Oxygen consumption rate ring (R). Set the angle of the oxygen consumption rate ring scale from 3 to 10 to 90°, with scale 3 at 0° and scale 10 at 90°. Oxygen consumption rate range: 0.3L / min to 35L / min.

[0038] Calculation formula: Angle = [Log(R) - Log(3)] / [Log(10) - Log(3)] × 90°.

[0039] Key numerical angle correspondence table:

[0040] Bottom fixed plate (middle ring): Time ring (T), derived from the oxygen cylinder pressure scale ring and oxygen consumption rate scale ring, with time scales 30 to 100 at an angle of 90°. Scale 30 is at 0°, and scale 100 is at 90°. Time range: 20 min to 2000 min. The time scale needs to be matched with the P and R rings. For example, when P=3 and R=10, T=30 min. This 30 min scale point should be aligned with 3 MPa on the P ring and 10 L / min on the R ring.

[0041] Calculation formula: Angle = [Log(T) - Log(30)] / [Log(100) - Log(30)] × 90°.

[0042] Table of key time-related numerical angles:

[0043] Middle tray: Flow rate / minute ventilation circle (L). The logarithmic formula shows a linear relationship between flow rate / minute ventilation and the logarithm of oxygen consumption rate. Therefore, the angle of the flow rate / minute ventilation circle scale from 3 to 10 is also 90°, with scale 3 at 0° and scale 10 at 90°. Flow rate / minute ventilation range: 3L to 80L. The oxygen consumption rate indicator arrow is aligned with the flow rate / minute ventilation scale 12L.

[0044] Calculation formula: Angle = [Log(L) - Log(3)] / [Log(10) - Log(3)] × 90°.

[0045] Table of Key Values ​​for Flow Rate / Minute Ventilation (CNV) and Their Corresponding Angles:

[0046] Bottom fixed plate: Oxygen concentration (FIO2), calculated using the formula R = L × (FIO2 - 0.21) / 0.79, logarithm Log(R) = Log(L) + Log(FIO2 - 0.21) - Log0.79. This shows a non-linear logarithmic relationship between oxygen concentration (FIO2) and oxygen consumption rate (R) and flow rate / minute ventilation (L), but a linear relationship between (FIO2 - 0.21) and the logarithm of oxygen consumption rate (R) and flow rate / minute ventilation (L). Oxygen concentration range: 30% to 100%. Calculation method is the same as above.

[0047] Table of Key Values ​​for Oxygen Concentration (Angle Correspondence):

[0048] In summary, this calculation panel employs a three-layer turntable and two-stage coupled calculation mechanical structure, capable of calculating the available time of oxygen cylinders for nasal cannulas, face masks, high-flow nasal cannulas, and mechanical ventilation. It fundamentally avoids human calculation errors, adding a solid layer of protection for patient safety; it significantly shortens pre-transfer preparation time, gaining valuable time for rescuing critically ill patients. Passive and portable: requiring no electricity, with a robust structure and low cost, it is highly suitable for widespread adoption in various emergency and resource-constrained environments. This tool is applicable to all oxygen therapy scenarios involving oxygen cylinder supply, such as ICUs, emergency rooms, anesthesiology departments, respiratory departments, and pre-hospital emergency care, possessing extremely high clinical applicability and promotional value.

[0049] Example 2 Two-stage coupled calculation: For patients receiving high-flow oxygen or mechanical ventilation, three variables are input in two steps: oxygen concentration (FiO2), flow rate / minute ventilation (R×VTi), and oxygen cylinder pressure (P), which are then converted into one output variable, available time (Time); For patients receiving oxygen via nasal cannula or face mask, only two variables need to be input in one step: oxygen consumption rate (i.e., the patient's oxygen flow rate) and oxygen cylinder pressure (P), which are then converted into one output variable, available time (Time).

[0050] For patients receiving high-flow oxygen or mechanical ventilation: First calculation (FiO2 + flow rate / minute ventilation → oxygen consumption rate): Action: Rotate the middle tray so that its specific flow rate (read via high-flow instrument) / minute ventilation value (read via ventilator) aligns with the specific oxygen concentration value (read via high-flow instrument / ventilator) on the bottom tray.

[0051] Result: At this point, the oxygen consumption rate indicator arrow on the middle plate will point to the oxygen consumption rate scale circle in the first calculation area of ​​the bottom plate, and the current theoretical oxygen consumption rate can be read directly.

[0052] Second calculation (Oxygen consumption rate + P → Available time): Action: Rotate the upper plate so that the specific oxygen cylinder pressure scale value (the pressure value displayed on the oxygen cylinder) is aligned with the oxygen consumption rate scale value obtained in the first step.

[0053] Result: At this point, the available time indicator arrow on the upper disk will point to the final time scale circle in the second calculation area of ​​the lower disk, directly reading the estimated available time of the oxygen cylinder.

[0054] Through the synergistic effect of the two-step operation, the oxygen consumption rate obtained in the first step provides an accurate input for the available time calculation in the second step. There is no need for medical staff to memorize or derive formulas. The calculation can be completed in just a few seconds, which shortens the calculation time and avoids the risk of oxygen depletion during transportation due to manual calculation errors. It is suitable for scenarios such as ICU, emergency room, and anesthesiology department that require the in-hospital and out-of-hospital transportation of patients who need high-flow oxygen or mechanical ventilation.

[0055] For patients receiving oxygen via nasal cannula or face mask: Rotate the top plate to align the oxygen cylinder pressure scale with the oxygen consumption rate scale on the top plate, so that the available time indicator arrow on the top plate indicates the available time corresponding to the available time scale on the bottom plate, thus obtaining the available time of the oxygen cylinder. The oxygen consumption rate scale represents the inhaled oxygen flow rate, which is read through the flow meter, and the oxygen cylinder pressure is read through the oxygen cylinder.

[0056] Example 3 (Applicable to 5-liter and other volume oxygen cylinders) For a 5-liter oxygen cylinder, simply adjust the V value in the general formula to 5, and recalculate and distribute the logarithmic scale of each layer accordingly to create a calculation disk suitable for a 5L oxygen cylinder.

[0057] The general formula is as follows: For patients receiving oxygen via nasal cannula or face mask connected to an oxygen cylinder: T = P × 50 / oxygen flow rate. For patients receiving high-flow nasal cannula oxygen: T = P × 50 / [oxygen flow rate × (FiO2 - 0.21) / 0.79]. For patients on mechanical ventilation: T = P × 50 / [MV × (FiO2 - 0.21) / 0.79].

[0058] Its three-layer turntable structure and two-stage coupled calculation method are exactly the same as those defined in Embodiment 1 of this invention. Those skilled in the art can design and manufacture a calculation disk applicable to 5-liter, 15-liter, or other arbitrary volume oxygen cylinders based on the general formulas and logarithmic scale principle disclosed in this invention.

[0059] While the specific embodiments of the present invention have been described above, they are not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A multivariate coupled oxygen cylinder usage time calculation disk, characterized in that, It includes a bottom plate, a middle plate, and a top plate arranged from bottom to top, with the diameter decreasing in that order. The middle plate and the top plate are rotatably mounted on the bottom plate. The bottom plate has an outer ring of oxygen concentration scale, a middle ring of available time scale, and an inner ring of oxygen consumption rate scale. The middle layer disk is provided with a flow rate / minute ventilation scale corresponding to the oxygen concentration scale, an available time indicator box corresponding to the available time scale, and an oxygen consumption rate indicator box corresponding to the oxygen consumption rate scale. The oxygen consumption rate indicator box has an inwardly protruding oxygen consumption rate indicator arrow. The top plate is equipped with an oxygen cylinder pressure scale corresponding to the oxygen consumption rate scale, as well as an arrow indicating the available time.

2. The multivariable coupled oxygen cylinder time calculation disk as described in claim 1, characterized in that, The oxygen concentration scale ranges from 30% to 100%, and the 0° counterclockwise angle corresponds to 0° to 163.38°.

3. The multivariable coupled oxygen cylinder time calculation disk as described in claim 1, characterized in that, The available time scale ranges from 20 min to 2000 min, and the 0° clockwise angle corresponds to -30.29° to 313.83°.

4. The multivariable coupled oxygen cylinder time calculation disk as described in claim 1, characterized in that, The oxygen consumption rate scale ranges from 0.3 L / min to 35 L / min, and the 0° counterclockwise angle corresponds to -172.08° to 183.61°.

5. The multivariable coupled oxygen cylinder time calculation disk as described in claim 1, characterized in that, The flow rate / minute ventilation scale ranges from 3L to 80L, and the 0° clockwise corresponding angle is from 0° to 245.39°.

6. The multivariable coupled oxygen cylinder time calculation disk as described in claim 5, characterized in that, The oxygen consumption rate indicator arrow is aligned with the flow rate / minute ventilation scale of 12L.

7. The multivariable coupled oxygen cylinder time calculation disk as described in claim 1, characterized in that, The oxygen cylinder pressure scale ranges from 3 MPa to 16 MPa, and the 0° counterclockwise angle corresponds to 0° to 125.10°.

8. The multivariable coupled oxygen cylinder time calculation disk as described in claim 7, characterized in that, The available time indicator arrow and the oxygen cylinder pressure scale 10MPa are on the same straight line and are located on opposite sides of the center.

9. A calculation method for a multivariate coupled oxygen cylinder usage time calculation disk as described in any one of claims 1-8, characterized in that, For patients receiving high-flow oxygen or mechanical ventilation: Rotate the middle layer disc to align the flow rate / minute ventilation scale on the middle layer disc with the oxygen concentration scale on the bottom layer disc, so that the oxygen consumption rate indicator arrow on the middle layer disc indicates the oxygen consumption rate corresponding to the oxygen consumption rate scale on the bottom layer disc. The flow rate is read by a high-flow instrument, the minute ventilation is read by a ventilator, and the oxygen concentration is read by a high-flow instrument or a ventilator. Rotate the top plate to align the oxygen cylinder pressure scale on the top plate with the oxygen consumption rate scale indicated in the previous step. This will cause the available time indicator arrow on the top plate to indicate the available time corresponding to the available time scale on the bottom plate, thus obtaining the available time of the oxygen cylinder. The oxygen cylinder pressure is read from the oxygen cylinder.

10. The calculation method as described in claim 9, characterized in that, For patients receiving oxygen via nasal cannula or face mask: Rotate the top plate to align the oxygen cylinder pressure scale with the oxygen consumption rate scale, so that the available time indicator arrow on the top plate indicates the available time corresponding to the available time scale on the bottom plate, thus obtaining the available time of the oxygen cylinder. The oxygen consumption rate scale is the inhaled oxygen flow rate, which is read through the flow meter, and the oxygen cylinder pressure is read through the oxygen cylinder.

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