High flow oxygen catheter and heated oxygen cylinder

Abstract

This invention provides a high-flow oxygen inhalation catheter and a heated oxygen inhalation bottle. The high-flow oxygen inhalation catheter includes an inner lumen cross-section of not less than 12 mm. 2 The oxygen supply connection tube and the cross-section of the nasal oxygen supply section are 7-30mm. 2 The in-nasal cannula has an expansion chamber between the oxygen supply connection tube and the in-nasal cannula to reduce gas pressure, and the in-nasal cannula is equipped with a fixing strap; the heated oxygen cylinder includes a flow meter with a range of not less than 40L / min, a humidification bottle and a heating module connected in sequence, which replaces the existing expensive heated high-flow oxygen inhalation device and high-flow oxygen inhalation tubing, and can be used for both high-flow and low-flow oxygen inhalation at the same time. It has a simple structure, low cost and is easy to promote.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more particularly to high-flow oxygen inhalation catheters and heated oxygen cylinders. Background Technology

[0002] High-flow oxygen therapy is an indispensable technique between mask oxygen therapy and endotracheal intubation, improving patient safety. However, the instruments and consumables used for high-flow oxygen therapy are currently complex, costly, and expensive, hindering its widespread clinical application.

[0003] Meanwhile, oxygen therapy is administered in ascending order of intensity: regular nasal cannula oxygen therapy, face mask oxygen therapy, high-flow oxygen therapy, and endotracheal intubation respiratory support, matching the progression from mild to severe respiratory condition. Before intubation for respiratory support, if a patient's mild respiratory condition gradually worsens, it is necessary to sequentially change the oxygen tubing and equipment, which is extremely inconvenient.

[0004] There is an urgent clinical need for a simple device and consumables that are simple in structure, low in cost, and compatible with replacing the existing ordinary nasal cannula oxygen inhalation, face mask oxygen inhalation, and high-flow oxygen inhalation. Summary of the Invention

[0005] To address the aforementioned deficiencies in the prior art, the present invention provides a high-flow oxygen inhalation catheter, comprising an oxygen supply connection tube and a prenasal tube sequentially connected to the oxygen outlet of an oxygen inhalation bottle, wherein the oxygen supply connection tube has a length of 2000-6000 mm; the prenasal tube is provided with two flexible nasal oxygen outlet tubes corresponding to the nasal cavity, and the inner cross-section of the nasal oxygen outlet tubes is 7-30 mm. 2 The nasal cannula has an expansion chamber connected between the oxygen supply connection tube and the nasal oxygen outlet tube to reduce gas pressure. The expansion chamber has a length of not less than 30 mm and a cross-section of not less than 29 mm². 2 .

[0006] Furthermore, several parallel raised stripes are provided around the outer wall of the expanded cavity.

[0007] Furthermore, the oxygen supply connection pipe is provided with a matching oxygen supply interface pipe corresponding to the oxygen outlet of the oxygen inhalation bottle, and the connection force between the oxygen supply interface pipe and the oxygen outlet of the oxygen inhalation bottle is greater than 1N.

[0008] The heated oxygen supply cylinder includes, in sequence, a central oxygen supply fixed inlet, a gas flow meter with a range of not less than 40 L / min, a humidification bottle, and an oxygen outlet. The oxygen outlet in the humidification bottle, which extends into the humidified water, has several fine channels. It also includes a heating module, which is installed adjacent to the humidification bottle to heat and maintain the liquid water inside the humidification bottle at 36-50°C.

[0009] Furthermore, the heating module is located at the bottom of the humidification bottle to form the bottom of the humidification bottle, and the outer edge of the heating module is sealed and fixed to the inner wall of the bottom of the humidification bottle.

[0010] Furthermore, the heating module includes an aluminum alloy constant temperature electric heating block, which is electrically connected to a transformer socket with an input voltage of 220-360 volts and an output voltage of 12-24 volts.

[0011] Furthermore, the aluminum alloy constant temperature heating block is equipped with a control switch that is linked to the gas flow rate. When the gas flow rate is greater than 5L / min, the control switch is turned on, the aluminum alloy constant temperature heating block starts, and the temperature is kept constant at 36℃-50℃; when the gas flow rate is less than 5L / min, the control switch is turned off, and the aluminum alloy constant temperature heating block stops working.

[0012] Furthermore, the control switch includes an elastic metal contact and a fixed metal contact arranged sequentially along the airflow direction on the inner wall of the oxygen outlet cavity of the gas flow meter. The elastic metal contact and the fixed metal contact are part of the circuit of the aluminum alloy constant temperature heating block, with a spacing of less than 2mm.

[0013] When the oxygen flow rate is greater than 5 L / min, the airflow deforms the elastic metal contact and makes contact with the fixed metal contact, thus connecting the circuit of the aluminum alloy constant temperature heating block; when the oxygen flow rate is less than 5 L / min, the elastic metal contact elastically returns to its original state and separates from the fixed metal contact, thus disconnecting the circuit of the aluminum alloy constant temperature heating block.

[0014] Furthermore, the expansion cavity is connected to an air interface and a cover. Correspondingly, an air pump is provided, with a gas filter at the air pump inlet and a gas flow meter at the air pump outlet, and an air pipeline is adapted to connect to the air interface.

[0015] The beneficial effects of this invention are: Replacing the existing expensive heated humidified high-flow oxygen therapy device with a low-cost heated oxygen bottle reduces the cost of high-flow oxygen therapy equipment; replacing the existing expensive high-flow oxygen therapy tubing with a low-cost high-flow oxygen therapy tubing makes the promotion of high-flow oxygen therapy technology easier, especially in anesthesia clinics and general wards for painless clinical treatment, thereby improving patient safety. It can be used for both high-flow and low-flow oxygen therapy and is easy to use. Using an oxygen supply connection tube to replace expensive high-flow breathing tubing, the tube slows down the high-speed gas through an expansion chamber, improving patient comfort during oxygen inhalation. It has a simple structure, low cost, and maintains the same level of comfort. It is also disposable, eliminating the risk of cross-infection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the high-flow oxygen inhalation catheter of the present invention; Figure 2 This is a schematic cross-sectional view of the anterior nasal tube of the present invention. Figure 3 This is a schematic diagram of the heated oxygen inhalation bottle structure of the present invention; Figure 4This is a circuit diagram of the control switch for the heating module of the present invention; Figure 5 This is a diagram showing the assembly of the high-flow oxygen inhalation tubing and the heated oxygen inhalation bottle of the present invention; Figure 6 This is a schematic diagram of another embodiment of a high-flow oxygen inhalation catheter; In the picture, 1. Oxygen supply connection tube; 11. Oxygen supply interface tube; 2. Nasal cannula; 21. Nasal oxygen outlet tube; 22. Expansion cavity; 23. Raised stripes; 24. Fixing strap; 25. Air interface; 3. Gas flow meter; 4. Humidification bottle; 51. Aluminum alloy constant temperature electric heating block; 52. Transformer socket; 53. Control switch; 54. Flexible metal contact piece; 55. Fixed metal contact point; 6. Central oxygen supply fixing socket. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solutions of the present invention and to make the above-mentioned features, objectives, and advantages of the present invention clearer and easier to understand, the present invention will be further described below with reference to embodiments. These embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0018] like Figure 1-2 , Figure 5 As shown, a high-flow oxygen inhalation catheter is used for high-flow oxygen therapy (oxygen flow rate is mostly between 20-40 L / min, with a maximum of 100 L / min). It includes an oxygen supply connection tube 1 and a prenasal tube 2 that are sequentially connected to the oxygen outlet of the oxygen cylinder. The inner cross-section of the oxygen supply connection tube 1 is not less than 12 mm. 2 12-20mm 2 Optimal. The inner cross-section of oxygen supply connection pipe 1 is significantly larger than that of the existing oxygen supply pipeline, which helps to reduce oxygen supply pressure (12-20mm). 2 The internal cross-section significantly reduces the oxygen supply gas pressure, minimizing the risk of the oxygen supply connection tube 1 detaching from the oxygen outlet of the oxygen cylinder during use, thus meeting clinical needs. An excessively thick oxygen supply connection tube 1 would not only increase cost but also weight, compromising ease of use and comfort. The oxygen supply connection tube 1, with a length of 2000-6000mm, provides sufficient length to connect the central oxygen cylinder outlet located on the wall of the medical unit (ward or treatment room) to the prenasal tube 2 located in front of the patient's nasal cavity on the bed, meeting clinical requirements.

[0019] The anterior nasal cannula 2 is provided with two flexible nasal oxygen outlet tubes 21 corresponding to the nasal cavity, and the inner cross-section of the nasal oxygen outlet tube 21 is 7-30mm. 2 When using, the nasal oxygen outlet tube 21 is inserted into the shallow part of the nasal cavity. During high-flow oxygen inhalation, the gas flow is greater, resulting in a noticeable blowing sensation; therefore, the cross-sectional area of ​​the inner cavity of the nasal oxygen outlet tube 21 needs to be increased accordingly. (7-30mm) 2The cross-sectional area of ​​a single nasal oxygen outlet tube 21 should be designed as a near-circular tube with a certain curvature to fit the nasal cavity anatomy, catering to different usage needs from infants to adult men, with a cross-sectional area of ​​7mm for infants. 2 As the lower limit, 30mm is used for adult males. 2 The upper limit is that it should not be too thick to ensure a smooth and comfortable insertion into the patient's nasal cavity, nor too thin to avoid excessive oxygen flow causing a strong blowing sensation.

[0020] The nasal cannula 2 is connected to the oxygen supply connection tube 1 and the nasal oxygen outlet tube 21 by an expansion cavity 22 for reducing gas pressure. The expansion cavity 22 has a cross-section of not less than 29 mm. 2 The optimal range is 29-154mm. 2 29mm 2 Equivalent to a 6mm diameter circular cavity, it can perform the function of slowing down high-flow gas; 154mm 2 A 14mm diameter cavity is the maximum for adult male patients; exceeding this will inevitably obstruct exhalation. The length of the enlarged cavity 22 should not be less than 30mm; otherwise, the decompression effect will be insufficient. 30-70mm is optimal; exceeding 70mm results in an excessively long cavity 22, which is practically meaningless. The enlarged cavity 22 significantly reduces the high-speed oxygen flow velocity within the oxygen supply connection tube 1, preventing it from rushing out of the nasal oxygen outlet tube 21 under inertia and causing a strong blowing sensation to the patient. Similarly, the enlarged cavity 22 should not be too thick or too long to avoid discomfort from a heavy load on the mouth and nose, nor should it be too thin or too short, resulting in insufficient decompression and decompression effects. Smaller patients require less oxygen flow and can use a shorter, thinner cavity; larger patients require more oxygen flow and should use a longer, thicker cavity. Different models of products can be selected accordingly. Because the gas flow rate is high during high-flow oxygen inhalation, in order to prevent the infront nasal tube 2 from falling off, a fixing strap 24 is connected to the corresponding cheeks on both sides of the infront nasal tube 2 to wrap around the patient's head and fix the infront nasal tube 2 to the patient's nose, so that the two nasal oxygen outlet tubes 21 are properly fixed in the shallow part of the patient's nasal cavity.

[0021] A number of parallel raised stripes 23 are arranged around the outer wall of the expanded cavity 22. The raised stripes 23 should be arranged sequentially along the tubular outer wall of the long axis of the expanded cavity 22, acting like a corrugated pipe to increase the deformation smoothness of the expanded cavity 22 and reduce bending and blockage of the expanded cavity 22 under pressure to a certain extent.

[0022] The oxygen supply connection pipe 1 is equipped with a matching oxygen supply interface pipe 11 corresponding to the oxygen outlet of the oxygen cylinder. The connection force between the oxygen supply interface pipe 11 and the oxygen outlet of the oxygen cylinder is greater than 1N. During high-flow oxygen inhalation, the pressure inside the oxygen supply connection pipe 1 is relatively high, which may cause the oxygen supply connection pipe 1 to detach from the oxygen outlet of the corresponding oxygen cylinder. Increasing the connection force reduces the occurrence of detachment. A connection force of 1-3N is more suitable; if it is too small, it is easy to detach during use; if it is too large, it is inconvenient to disassemble after use.

[0023] To facilitate use and prevent the airflow from dispersing the patient's body temperature and causing hypothermia or excessive dryness and discomfort in the nasal cavity during high-flow oxygen therapy, a heated oxygen bottle is provided with the matching oxygen supply connection tube 1. Figure 3 , Figure 5 As shown, it includes a central oxygen supply fixed socket 6, a gas flow meter 3 with a range of not less than 40L / min, a humidification bottle 4 and an oxygen outlet connected in sequence. The oxygen outlet in the humidification bottle 4 is a number of fine channels extending into the humidification water. It also includes a heating module, which is arranged adjacent to the humidification bottle 4 to heat and keep the liquid water in the humidification bottle 4 at a temperature of 36-50℃.

[0024] The central oxygen supply fixed socket 6 is used to match and fix the oxygen supply port on the wall of the medical unit. There are fixed standards all over the world, which will not be elaborated here.

[0025] The flow rate of gas flow meter 3 should be no less than 40 L / min. For high-flow oxygen administration, the oxygen flow rate is typically 20-40 L / min, which meets the needs of most clinical applications. While the flow rate of gas flow meter 3 can be set to 0-100 L / min, the larger the range, the lower the accuracy. 0-40 L / min is optimal for general wards and anesthesiology departments, while 0-100 L / min is optimal for the ICU. The appropriate range should be selected based on the specific scenario.

[0026] Humidification bottle 4 is a water-filled bottle. After oxygen flows out through gas flow meter 3, it passes through the water in humidification bottle 4, becoming rich in water vapor to prevent nasal dryness and discomfort for the patient. The humidified oxygen is then discharged through the oxygen outlet of humidification bottle 4 and enters oxygen supply connection tube 1. During high-flow oxygen inhalation, the gas flow rate is large. To ensure humidification effect, the gas should be transformed into fine bubbles in humidification bottle 4 to fully contact the water. The oxygen outlet extending into the humidification water inside humidification bottle 4 consists of several fine channels.

[0027] Furthermore, the heated oxygen cylinder also includes a heating module. Directly heating the gas is inefficient, requires significant thermal power, and results in high temperatures. To reduce thermal power and temperature during heating, this invention uses water heating. The heating module heats the water inside the humidification bottle 4, allowing oxygen to pass through as fine bubbles and be fully heated through contact with the water. To improve water heating efficiency, the heating module and humidification bottle 4 are positioned adjacent to each other, heating and maintaining the temperature of the liquid water inside the humidification bottle 4 at 36-50°C. A water temperature of 36-50°C is relatively safe, with 45°C being optimal, preventing burns and allowing for a safe temperature of 30-40°C for high-flow oxygen.

[0028] The heating module is located at the bottom of the humidification bottle 4, forming the bottom of the bottle. The outer edge of the heating module is sealed and fixed to the inner wall of the bottom of the humidification bottle 4. This is a very simple structure. The humidification bottle 4 is made into a cylindrical shape with openings at both ends, and the heating module is made into a disc-shaped cylinder, which is sealed and fixed to the inner wall of the cylindrical humidification bottle 4 at its bottom opening. The circuit of the heating module is connected from below, separating water and electricity to avoid malfunctions caused by leakage and improve safety. The heating module directly heats the humidified water in the humidification bottle 4, improving heating efficiency.

[0029] The heating module includes an aluminum alloy constant-temperature electric heating block 51, which is electrically connected to a transformer socket 52. The transformer socket 52 has an input voltage of 220-360 volts and an output voltage of 12-24 volts. This is to ensure safety during use and avoid the risk of electric shock, using common wall power and low-voltage power supply.

[0030] like Figure 4 As shown, the aluminum alloy constant temperature heating block 51 is equipped with a control switch 53 that is linked to the gas flow rate. When the gas flow rate is greater than 5L / min, the control switch 53 is connected, the aluminum alloy constant temperature heating block 51 is started, and the temperature is kept constant at 36℃-50℃; when the gas flow rate is less than 5L / min, the control switch 53 is disconnected, and the aluminum alloy constant temperature heating block 51 stops working.

[0031] The control switch 53 includes an elastic metal contact 54 and a fixed metal contact 55 arranged sequentially along the airflow direction on the inner side wall of the oxygen outlet pipe of the gas flow meter 3. The elastic metal contact 54 and the fixed metal contact 55 are part of the circuit of the aluminum alloy constant temperature heating block 51, and the spacing is less than 2mm. When the oxygen flow rate is greater than 5 L / min, the airflow deforms the elastic metal contact 54, bringing it into contact with the fixed metal contact 55, thus connecting the circuit of the aluminum alloy thermostatic heating block 51. When the oxygen flow rate is less than 5 L / min, no heating is required for oxygen absorption. In this case, the elastic metal contact 54 returns to its elastic state and separates from the fixed metal contact 55, disconnecting the circuit of the aluminum alloy thermostatic heating block 31. This is a common control mode and will not be described in detail here.

[0032] It is important to note that the above structure can be used not only for high-flow oxygen therapy, but also for low-flow oxygen therapy. Simply turn the regulating valve to reduce the oxygen flow rate of the heated oxygen therapy bottle.

[0033] The above structure has a significant drawback: the oxygen supplied from the nasal oxygen outlet tube 21 during oxygen inhalation is pure oxygen, which can be used normally in general anesthesia scenarios, but cannot be used for a long time in ICU environments where patients have poor lung oxygenation and need to provide oxygen with a slightly higher flow rate and lower oxygen concentration.

[0034] To achieve high-flow-rate oxygen administration at low oxygen concentrations, such as Figure 6As shown, the expansion chamber 22 is equipped with an air interface 25 and a cover. By opening the cover and connecting an air pump to the air interface 25, the oxygen concentration can be reduced while increasing the gas flow rate during high-flow oxygen inhalation. Correspondingly, an air pump is provided, with a gas filter at the air pump inlet and a gas flow meter at the air pump outlet, and an air pipeline is adapted to connect to the air interface (25). During use, the oxygen supply flow rate and concentration need to be manually calculated and then adjusted. The total flow rate of the oxygen supply gas is the sum of the oxygen flow rate a of the gas flow meter 3 and the air flow rate b of the air pump, i.e., a + b, and the oxygen concentration is (100%a + 21%b) / (a ​​+ b). The air interface 25 is set in the expansion chamber 22 to maximize the pressure reduction effect of the expansion chamber 22, reduce the secondary pressurization of the gas pressure in the oxygen supply connection pipe 1 by the air flow, and prevent the oxygen supply connection pipe 1 from falling off the oxygen outlet of the oxygen inhalation bottle. The air inlet 25 is preferably located on the side of the expansion cavity 22 near the oxygen supply connection tube 1, which is conducive to the full mixing of air and pure oxygen in the expansion cavity 22, and then the oxygen is released in the nasal cavity through the nasal oxygen outlet tube 21.

[0035] The above embodiments are merely illustrative of the principles and effects of this patent application and are not intended to limit this patent application. Any person skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of this patent application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this patent application shall still be covered by the claims of this patent application.

Claims

1. A high-flow oxygen inhalation catheter, comprising an oxygen supply connection tube (1) and a prenasal cannula (2) sequentially connected to the oxygen outlet of an oxygen inhalation bottle, characterized in that: The length of the oxygen supply connection pipe (1) is 2000-6000 mm; The anterior nasal cannula (2) is equipped with two flexible nasal oxygen outlet tubes (21) corresponding to the nasal cavity. The inner cross-section of the nasal oxygen outlet tube (21) is 7-30 mm. 2 ; The nasal cannula (2) is connected between the oxygen supply connection tube (1) and the nasal oxygen outlet tube (21) and has an expansion chamber (22) for reducing gas pressure. The expansion chamber (22) has a length of not less than 30 mm and a cross-section of not less than 29 mm. 2 .

2. The high-flow oxygen inhalation catheter according to claim 1, characterized in that: A number of parallel raised stripes (23) are provided around the outer wall of the expanded cavity (22).

3. The high-flow oxygen inhalation catheter according to claim 1, characterized in that: The oxygen supply connection pipe (1) is provided with a matching oxygen supply interface pipe (11) corresponding to the oxygen outlet of the oxygen inhalation bottle, and the connection force between the oxygen supply interface pipe (11) and the oxygen outlet of the oxygen inhalation bottle is greater than 1N.

4. The high-flow oxygen inhalation catheter according to claim 1, characterized in that: The expansion cavity (22) is provided with an air interface (25) and a cover; correspondingly, an air pump is provided, the air pump inlet is provided with a gas filter, the air pump outlet is provided with a gas flow meter, and an air pipeline is adapted to connect with the air interface (25).

5. A heated oxygen inhalation bottle, comprising a central oxygen supply fixed inlet (6), a gas flow meter (3) with a range of not less than 40 L / min, a humidification bottle (4), and an oxygen outlet connected in sequence, wherein the oxygen outlet in the humidification bottle (4) extending into the humidification water is a plurality of fine channels, characterized in that: It also includes a heating module, which is installed adjacent to the humidification bottle (4) to heat and keep the liquid water in the humidification bottle (4) at 36-50°C; The heating module includes an aluminum alloy constant temperature electric heating block (51), which is electrically connected to a transformer socket (52). The input voltage of the transformer socket (52) is 220-360 volts, and the output voltage is 12-24 volts. The aluminum alloy constant temperature electric heating block (51) is equipped with a control switch (53) that is linked to the gas flow rate. When the gas flow rate is greater than 5L / min, the control switch (53) is connected, the aluminum alloy constant temperature electric heating block (51) is started, and the temperature is kept constant at 36℃-50℃; when the gas flow rate is less than 5L / min, the control switch (53) is disconnected, and the aluminum alloy constant temperature electric heating block (51) stops working.

6. The heated oxygen inhalation bottle according to claim 5, characterized in that: The heating module is set at the bottom of the humidification bottle (4) to form the bottom of the humidification bottle (4), and the outer edge of the heating module is sealed and fixed to the inner wall of the bottom of the humidification bottle (4).

7. The heated oxygen inhalation bottle according to claim 5, characterized in that: The control switch (53) includes an elastic metal contact (54) and a fixed metal contact (55) arranged sequentially along the airflow direction on the inner side wall of the oxygen outlet cavity of the gas flow meter (3). The elastic metal contact (54) and the fixed metal contact (55) are part of the circuit of the aluminum alloy constant temperature electric heating block (51), with a spacing of less than 2mm. When the oxygen flow rate is greater than 5L / min, the airflow causes the elastic metal contact (54) to deform and come into contact with the fixed metal contact (55), and the circuit of the aluminum alloy constant temperature heating block (51) is connected; when the oxygen flow rate is less than 5L / min, the elastic metal contact (54) elastically recovers and separates from the fixed metal contact (55), and the circuit of the aluminum alloy constant temperature heating block (51) is disconnected.

Images