Double-cavity breathing circuit

Abstract

The utility model provides a double-cavity breathing circuit, which relates to the technical field of medical instruments and comprises an inspiration inner tube and an expiration outer tube which are coaxially mounted, a connecting mechanism is inserted and fixed at the front ends of the inspiration inner tube and the expiration outer tube, and the connecting mechanism comprises a mounting seat, a driving sleeve and a reset torsion spring. An inner ring sleeve and an outer ring sleeve are concentrically arranged on the upper side of the mounting seat, a plurality of fixing rib plates are integrally formed between the inner ring sleeve and the outer ring sleeve, the driving sleeve comprises a closed sleeve, a connecting ring and a plurality of inclined fan blades, the reset torsion spring is connected between the outer ring sleeve and the connecting ring, a plurality of vent holes are formed in the circumference of the inner ring sleeve, and the inner ring sleeve is provided with a plurality of air holes. Deflation holes are formed in the positions, corresponding to the height of the vent holes, of the closed sleeve at intervals, and the inner side of the inspiration inner pipe communicates with the expiration outer pipe through the vent holes and the deflation holes. According to the utility model, negative pressure suction is generated in the expiration outer pipe through airflow generated by expiration, so that CO2 waste gas is quickly exhausted.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a dual-chamber breathing circuit. Background Technology

[0002] A bidirectional breathing circuit typically includes two separate inspiratory and expiratory branches, forming a loop between the gas outlet of the anesthesia machine and the patient's airway. Fresh gas and inhaled anesthetic drugs are delivered into the patient's airway through the inspiratory branch, while exhaled gas is expelled from the body through the expiratory branch. Clinically, two parallel branches are usually used, connected by a Y-shaped three-way connector and placed in the patient's mouth or attached to the anesthesia mask. The ventilator continuously supplies a high flow rate of fresh gas to flush exhaled CO2 waste gas into the expiratory branch for expulsion.

[0003] The parallel arrangement of inhalation and expiratory branches makes them prone to entanglement, and the Y-shaped three-way connector prolongs the mixing cavity, making it impossible to effectively remove CO2 waste gas. This can lead to repeated CO2 inhalation, causing pathophysiological disorders in multiple systems throughout the body, and even endangering life. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a dual-chamber breathing circuit, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A dual-chamber breathing circuit includes an inspiratory inner tube and an expiratory outer tube coaxially mounted. A connecting mechanism is inserted and fixed to the front ends of the inspiratory inner tube and the expiratory outer tube. The connecting mechanism includes a mounting base, a driving sleeve, and a return torsion spring. An inner ring and an outer ring are concentrically arranged on the upper side of the mounting base. Several fixing ribs are integrally formed between the inner and outer rings. The driving sleeve includes a closed sleeve rotatably fitted on the outside of the inner ring, a connecting ring rotatably connected to the inside of the outer ring, and several inclined blades connecting the connecting ring and the closed sleeve. The return torsion spring is connected between the outer ring and the connecting ring. Several ventilation holes are arranged around the circumference of the inner ring. Vent holes are arranged at height intervals corresponding to the ventilation holes on the closed sleeve. The inner side of the inspiratory inner tube communicates with the expiratory outer tube through the ventilation holes and vent holes.

[0009] Preferably, the outer wall of the inner ring sleeve and the inner wall of the outer ring sleeve are provided with a positioning ring one and a positioning ring two, the reset torsion spring is connected to the lower side of the positioning ring one, and the closed sleeve is rotatably installed between the positioning ring two and the fixed rib plate.

[0010] Preferably, a positioning groove is provided on the inner side of the upper edge of the closed sleeve, and a positioning block is provided on the lower side of the second positioning ring, the positioning block being slidably installed in the positioning groove.

[0011] Preferably, a coaxial adapter is installed at the rear end of the inhalation inner tube and the exhalation outer tube. A sealing ring is provided in the middle of the inner wall of the coaxial adapter. The exhalation outer tube is inserted into the lower end of the coaxial adapter. The top of the inhalation inner tube is inserted into the sealing ring. An exhalation hole is provided on the side wall of the coaxial adapter. An exhalation branch tube is provided outside the exhalation hole. The exhalation hole is located below the sealing ring.

[0012] (III) Beneficial Effects

[0013] This invention provides a dual-chamber breathing circuit. It has the following beneficial effects:

[0014] 1. In this invention, during inhalation, the resetting torsion spring pushes the closed sleeve to its initial position, and the vent hole and the ventilation hole are misaligned, isolating the inhalation inner tube from the exhalation outer tube. The fresh gas in the inhalation inner tube is always kept at positive pressure under the action of the ventilator to supply the patient with inhalation. When the patient exhales, the positive pressure generated on the lower side of the mounting base will cause the inhalation inner tube to always maintain positive pressure to replenish fresh gas under the action of the ventilator. The exhaled CO2 waste gas can only be discharged from the exhalation outer tube. During the discharge process, the airflow will tilt the fan blades to the position where the vent hole and the ventilation hole are connected, so that a part of the positive pressure fresh air is blown out from the ventilation hole, causing negative pressure to be generated on the lower side of the ventilation hole. This will form a Venturi tube structure in the inner and outer rings, which can quickly draw in the CO2 waste gas on the lower side. Combined with the flushing of fresh gas, the discharge efficiency of CO2 waste gas can be improved, and the re-inhalation of residual CO2 waste gas can be avoided. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a dual-chamber breathing circuit according to the present invention;

[0016] Figure 2 This is a cross-sectional view of a dual-chamber breathing circuit according to the present invention;

[0017] Figure 3 This is a schematic diagram of the connecting mechanism in this utility model;

[0018] Figure 4 This is a cross-sectional view of the mounting base in this utility model.

[0019] In the diagram: 1. Inhalation inner tube; 2. Exhalation outer tube; 3. Coaxial adapter seat; 4. Sealing ring; 5. Inhalation branch tube; 6. Exhalation branch tube; 7. Mounting seat; 71. Inner ring sleeve; 72. Outer ring sleeve; 73. Fixing rib plate; 74. Threaded joint; 8. Drive sleeve; 81. Sealing sleeve; 82. Connecting ring; 83. Inclined fan blade; 9. Return torsion spring; 10. Positioning ring one; 11. Positioning ring two; 12. Vent hole; 13. Exhaust hole; 14. Positioning groove; 15. Positioning block. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0021] This utility model embodiment provides a dual-chamber breathing circuit, such as Figure 1-4 As shown, the device includes an inspiratory inner tube 1 and an expiratory outer tube 2, both mounted coaxially. A coaxial adapter 3 is installed at the rear ends of both the inspiratory inner tube 1 and the expiratory outer tube 2. A sealing ring 4 is provided in the middle of the inner wall of the coaxial adapter 3. The top of the inspiratory inner tube 1 is inserted into the sealing ring 4. An inspiratory branch tube 5, which connects to the air supply connector of the ventilator, is provided at the top of the coaxial adapter 3. The expiratory outer tube 2 is inserted into the lower end of the coaxial adapter 3. An expiratory channel is formed between the inner wall of the expiratory outer tube 2, the outer wall of the inspiratory inner tube 1, the inner wall of the coaxial adapter 3, and the lower side of the sealing ring 4. An expiratory hole is provided on the side wall of the coaxial adapter 3, located below the sealing ring 4 and communicating with the expiratory channel. An expiratory branch tube 6, which connects to the ventilator's return connector, is provided outside the expiratory hole.

[0022] like Figures 2-4 As shown, the front ends of the inhalation inner tube 1 and the exhalation outer tube 2 are connected and fixed with a connecting mechanism. The connecting mechanism includes a mounting base 7, a driving sleeve 8, and a return torsion spring 9. An inner ring 71 and an outer ring 72 are concentrically arranged on the upper side of the mounting base 7. Several fixing ribs 73 are integrally formed between the inner ring 71 and the outer ring 72. A ventilation channel is provided between the several fixing ribs 73 so that the exhaled CO2 waste gas can flow from the ventilation channel into the exhalation channel. A threaded connector 74 for connecting an anesthesia mask is provided on the lower side of the mounting base 7.

[0023] The outer wall of the inner ring sleeve 71 and the inner wall of the outer ring sleeve 72 are provided with a positioning ring 10 and a positioning ring 2 11. A mounting groove 1 is provided between the positioning ring 10 and the fixing rib 73, and a mounting groove 2 is provided between the positioning ring 2 11 and the fixing rib 73. The driving sleeve 8 includes a closed sleeve 81 rotatably sleeved on the outside of the inner ring sleeve 71, a connecting ring 82 rotatably connected to the inside of the outer ring sleeve 72, and a plurality of inclined fan blades 83 connected between the connecting ring 82 and the closed sleeve 81. The closed sleeve 81 is rotatably installed in the mounting groove 2. The connecting ring 82 is rotatably disposed on the lower side of the mounting groove 1. The reset torsion spring 9 is disposed on the upper side of the mounting groove 1 and is connected between the positioning ring 10 and the connecting ring 82.

[0024] The inner ring 71 is provided with a plurality of ventilation holes 12 around its circumference. The sealing sleeve 81 is provided with vent holes 13 at height intervals corresponding to the ventilation holes 12. A sealing part is provided between the vent holes 13. Rotating the drive sleeve 8 can seal the ventilation holes 12 with the sealing part, isolating the inhalation inner tube 1 and the exhalation outer tube 2, or connecting the vent holes 13 with the ventilation holes 12, so that a portion of the positive pressure fresh gas in the inhalation inner tube 1 can flow into the exhalation channel at high speed, forming a Venturi tube structure, and a novel type of gas that flows out rapidly from the ventilation holes 12. The gas creates negative pressure in the lower part of the exhalation channel, allowing the ventilation channel to quickly draw in CO2 waste gas. Another part continues to be delivered to the lower side of the mounting base 7, flushing and pushing the CO2 waste gas out through the exhalation channel. During the exhalation process, CO2 waste gas can be drawn in through the ventilation channel. The combination of these two methods allows the mixture of fresh gas and CO2 waste gas under the mounting base 7 to be quickly drawn away, improving the efficiency of CO2 waste gas discharge, avoiding CO2 residue, and enabling a rapid response to the next breathing cycle, thus preventing the repeated inhalation of CO2.

[0025] In addition, a positioning groove 14 is provided on the inner side of the upper edge of the closed sleeve 81, and a positioning block 15 is provided on the lower side of the positioning ring 11. The positioning block 15 is slidably installed in the positioning groove 14. The positioning groove 14 and the positioning block 15 cooperate with each other to limit the forward and reverse rotation angle of the drive sleeve 8. This allows the drive sleeve 8 to close the ventilation hole 12 during inhalation when the reset torsion spring 9 pushes the fixed drive sleeve to close the ventilation hole 12. During exhalation, the airflow pushes the drive sleeve 8 to rotate to the position where the ventilation hole 12 connects with the vent hole 13, preventing excessive rotation that could cause the next sealing part to close the ventilation hole 12.

[0026] Working principle:

[0027] In this invention, under the action of the ventilator, the inspiratory inner tube 1 is constantly supplied with fresh gas at a positive pressure. During inhalation, under the elastic force of the return torsion spring 9, the drive sleeve 8 is always kept in its initial state. At this time, the sealing part of the sealing sleeve 81 blocks the outside of the ventilation hole 12, and the inspiratory inner tube 1 and the expiratory outer tube 2 are isolated, thus meeting the patient's inhalation needs. When the patient exhales CO2 waste gas, a positive pressure is formed in the mounting base 7. Since the inspiratory inner tube 1 is always supplied with positive pressure, CO2 waste gas can only be exhaled through the expiratory tube. The gas is discharged into the channel, forming a high-speed mixed airflow. During the exhalation process, the high-speed mixed airflow will push the inclined fan blade 83 of the drive sleeve 8, causing the drive sleeve 8 to rotate against the elasticity of the return spring. During the rotation, the vent hole 12 and the exhaust hole 13 are connected. A portion of the positive pressure fresh gas flows rapidly from the vent hole 12 and the exhaust hole 13 into the exhalation channel, forming a high-speed airflow. According to Bernoulli's principle, the part of the exhalation channel located below the vent hole 12 generates negative pressure, which produces a negative pressure suction effect on the CO2 waste gas and the new gas mixture below.

[0028] Another portion of positive pressure fresh gas will continuously replenish the lower side of the mounting base 7, flushing and pushing the exhaled CO2 waste gas, so that the CO2 waste gas can be discharged from the exhalation channel. Combined with the negative pressure suction above, the CO2 waste gas can be quickly and completely discharged, avoiding CO2 residue. It can quickly respond to the next breathing cycle and avoid CO2 re-inhalation.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dual-chamber breathing circuit, comprising an inspiratory inner tube and an expiratory outer tube coaxially mounted, characterized in that: The inhalation inner tube and the exhalation outer tube are connected and fixed at their front ends by a connecting mechanism. The connecting mechanism includes a mounting base, a driving sleeve, and a return torsion spring. An inner ring and an outer ring are concentrically arranged on the upper side of the mounting base. Several fixing ribs are integrally formed between the inner ring and the outer ring. The driving sleeve includes a closed sleeve rotatably sleeved on the outside of the inner ring, a connecting ring rotatably connected to the inside of the outer ring, and several inclined fan blades connecting the connecting ring and the closed sleeve. The return torsion spring is connected between the outer ring and the connecting ring. Several ventilation holes are arranged around the circumference of the inner ring. The closed sleeve is provided with vent holes at height intervals corresponding to the ventilation holes. The inner side of the inhalation inner tube is connected to the exhalation outer tube through the ventilation holes and vent holes.

2. The dual-chamber breathing circuit according to claim 1, characterized in that: The outer wall of the inner ring sleeve and the inner wall of the outer ring sleeve are provided with positioning ring one and positioning ring two. The reset torsion spring is connected to the lower side of positioning ring one, and the closed sleeve is rotatably installed between positioning ring two and fixed rib plate.

3. The dual-chamber breathing circuit according to claim 2, characterized in that: The upper inner side of the closed sleeve is provided with a positioning groove, and the lower side of the second positioning ring is provided with a positioning block, which is slidably installed in the positioning groove.

4. A dual-chamber breathing circuit according to claim 3, characterized in that: The inhalation inner tube and the exhalation outer tube are fitted with a coaxial adapter at their rear ends. A sealing ring is provided in the middle of the inner wall of the coaxial adapter. The exhalation outer tube is inserted into the lower end of the coaxial adapter. The top of the inhalation inner tube is inserted into the sealing ring. An exhalation hole is provided on the side wall of the coaxial adapter. An exhalation branch tube is provided outside the exhalation hole. The exhalation hole is located below the sealing ring.

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