Central negative pressure therapy apparatus and negative pressure therapy method

Abstract

The present invention provides a central negative pressure therapy apparatus and a negative pressure therapy method and belongs to the technical field of medical devices. The central negative pressure therapy apparatus comprises a two-position three-way structure and a control mechanism. The two-position three-way structure is arranged between a wound therapy instrument and a central negative pressure control mechanism. The two-position three-way structure is provided with a first passage through which the wound therapy instrument and the central negative pressure control mechanism communicate, and a second passage through which the wound therapy instrument communicates with an atmospheric pressure environment. The control mechanism is used for controlling the two-position three-way structure to switch between the first passage and the second passage, thereby achieving intermittent negative pressure therapy for a wound of a patient. Using the central negative pressure therapy apparatus and the corresponding negative pressure therapy method can accurately achieve rapid switching between continuous negative pressure and intermittent negative pressure at low cost, thereby remedying the technical defect that intermittent negative pressure and stable negative pressure cannot be provided for a wound of a patient by means of central negative pressure.

Description

A central negative pressure therapy device and a negative pressure therapy method Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a central negative pressure therapy device and a negative pressure therapy method. Background Technology

[0002] Negative pressure wound therapy (NPWT) systems play a crucial role in wound treatment. By creating a negative pressure environment, NPWT helps remove exudate, blood, and cellular debris from the wound, improves local blood circulation and oxygenation, and promotes new tissue formation and angiogenesis. Through removing wound exudate, reducing swelling, and providing a clean treatment environment, NPWT significantly reduces the risk of wound infection. It effectively controls and prevents wound infection, protecting the wound from bacteria and other pathogens.

[0003] In related technologies, the central negative pressure used for treating patient wounds is uniformly provided through the hospital's central control system. During use, the negative pressure is adjusted through the central control system and provided to the operating table at the end.

[0004] With the continuous advancement of wound care technology, intermittent negative pressure therapy is increasingly being adopted, which involves periodically applying and interrupting negative pressure suction at fixed time intervals. Intermittent negative pressure can stimulate tissue regeneration and inflammatory responses in the wound, promoting wound healing. While traditional central control systems in hospitals can achieve overall adjustment of negative pressure, the pressure at the central level is unstable, the adjustment value is limited, and the overall adjustment response speed is slow and the adjustment cost is high. Therefore, they cannot meet the structural requirements of intermittent negative pressure therapy and have significant limitations. Summary of the Invention

[0005] This invention provides a central negative pressure therapy device and a negative pressure therapy method, which can achieve stable continuous negative pressure and rapid switching between intermittent negative pressure at low cost and with high precision, overcoming the technical deficiency of related technologies that cannot provide intermittent negative pressure to patient wounds. The technical solution is as follows:

[0006] In a first aspect, embodiments of the present invention provide a central negative pressure therapy device, the central negative pressure therapy device comprising:

[0007] A two-way three-way structure is provided between the wound treatment device and the central negative pressure control mechanism. The two-way three-way structure has a first passage connecting the wound treatment device and the central negative pressure control mechanism, and a second passage connecting the wound treatment device and the normal pressure environment.

[0008] A control mechanism is used to control the two-position three-way structure to switch between the first and second channels, thereby achieving intermittent negative pressure therapy at the patient's wound site.

[0009] Optionally, the two-position three-way structure includes an inner cavity and a second air inlet, a second air outlet, and a first air outlet communicating with the inner cavity. The second air inlet is connected to the wound treatment device, and the second air outlet is connected to the central negative pressure control mechanism. A movable valve core is provided in the inner cavity. The movable valve core has a first working position in which it is recessed into the inner cavity to communicate with the second air inlet and the second air outlet, and a second working position in which it extends out of the first air outlet to communicate with the outside through the first air outlet. The control mechanism is throttlely connected to the movable valve core.

[0010] The two-position three-way structure includes an inner cavity and a third air inlet, a third air outlet, and a third air exhaust outlet communicating with the inner cavity. The third air inlet is connected to the wound treatment instrument, and the third air outlet is connected to the central negative pressure control mechanism. The movable valve core is provided in the inner cavity. The movable valve core has a third working position in which it extends out of the inner cavity to connect the third air inlet and the third air outlet, and a fourth working position in which it sinks into the inner cavity to connect the third air inlet to the outside through the third air exhaust outlet.

[0011] Optionally, the control mechanism includes a drive device and a controller. The drive device is connected to the two-position three-way structure and is drivenly connected to the movable valve core. The controller is electrically connected to the drive device.

[0012] Optionally, the driving device includes a power unit and an output slider. The output slider is vertically mounted on the top of the two-position three-way structure and connected to the movable valve core. The output slider is driven by the driving device.

[0013] Optionally, the power device is a lead screw motor, and the output shaft of the lead screw motor is fitted onto the output slider.

[0014] Optionally, the drive device further includes a motor support frame, which has an isolation cavity and is connected to the two-position three-way structure, and the power device is disposed in the isolation cavity.

[0015] Optionally, a lead screw bushing is provided on the top of the motor support frame, and the end of the output shaft is connected to the lead screw bushing.

[0016] Optionally, the drive device includes a mounting housing and a drive cylinder, the drive cylinder being mounted on the top of the two-position three-way structure via the mounting housing, and the drive shaft being coaxially connected to the movable valve core.

[0017] Optionally, the central negative pressure treatment device further includes a pressure regulating valve, which includes a first air inlet and a first air outlet, a second air inlet connected to the first air outlet, and the first air outlet connected to the wound treatment instrument.

[0018] Optionally, the pressure regulating valve is provided with a pressure regulating knob.

[0019] Optionally, the central negative pressure therapy device further includes an alarm, which is electrically connected to the control mechanism.

[0020] In a second aspect, embodiments of the present invention provide a negative pressure therapy method, implemented based on the central negative pressure therapy device described in the first aspect above, wherein the negative pressure therapy method includes:

[0021] Connect one end of the two-position three-way structure to the central negative pressure supply system and the other end to the wound treatment device;

[0022] The control mechanism controls the two-position three-way valve structure, driving the first passage of the two-position three-way valve structure to open, so as to provide continuous negative pressure treatment to the wound to be treated by the wound treatment instrument; or...

[0023] The control mechanism is used to control the two-position three-way structure, driving the two-position three-way structure to switch between the first and second channels at a preset frequency, so as to perform intermittent negative pressure treatment on the wound to be treated by the wound treatment device.

[0024] Optionally, the step of controlling the two-position three-way structure using the control mechanism, driving the two-position three-way structure to switch between the first and second channels at a preset frequency, so as to perform intermittent negative pressure therapy on the wound to be treated by the wound treatment instrument, includes:

[0025] The control mechanism controls the two-position three-way structure by alternately opening the first passage in a first time period and opening the second passage in a second time period. The first and second time periods range from 1 to 30 minutes, and a negative pressure between 0 and -450 mmHg is provided when switching to the first passage.

[0026] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0027] The central negative pressure therapy device provided in this embodiment of the invention can be connected to the central control system of a hospital that provides central negative pressure using a two-position three-way structure. The control mechanism with an integrated controller enables electrical control, driving the internal switching between the first and second channels of the two-position three-way structure. This allows for low-cost and precise rapid switching between continuous and intermittent negative pressure, solving the technical defects in related technologies that cannot meet the treatment needs of patients with different wounds and different negative pressures. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a three-dimensional structural diagram of one side of the central negative pressure therapy device provided in an embodiment of the present invention;

[0030] Figure 2 is a three-dimensional structural diagram of the other side of the central negative pressure therapy device provided in an embodiment of the present invention;

[0031] Figure 3 is a front structural schematic diagram of the central negative pressure therapy device provided in an embodiment of the present invention;

[0032] Figure 4 is a three-dimensional structural diagram of the movable valve core in the first working position in an embodiment of the present invention;

[0033] Figure 5 is a three-dimensional structural diagram of the movable valve core in the second working position in an embodiment of the present invention;

[0034] Figure 6 is a three-dimensional structural schematic block diagram of the driving device provided in an embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of another central negative pressure therapy device provided in an embodiment of the present invention;

[0036] Figure 8 is a front structural schematic diagram of another central negative pressure therapy device provided in an embodiment of the present invention;

[0037] Figure 9 is a schematic diagram of the two-position three-way structure in another central negative pressure therapy device provided in an embodiment of the present invention;

[0038] Figure 10 is a schematic diagram of another driving device and a two-position three-way structure provided in an embodiment of the present invention;

[0039] Figure 11 is a cross-sectional view of the structure in Figure 10 from another angle;

[0040] Figure 12 is a block diagram of the control mechanism provided in an embodiment of the present invention;

[0041] Figure 13 is a flowchart of the negative pressure treatment method provided in an embodiment of the present invention.

[0042] In the picture:

[0043] 1-Pressure regulating valve; 2-Two-position three-way structure; 3-Control mechanism; 11-First air inlet; 12-First air outlet; 13-Pressure regulating knob; 14-Fine adjustment knob; 21-Second air inlet; 22-Second air outlet; 23-First exhaust port; 24-Moving valve core; 25-Third air inlet; 26-Third air outlet; 27-Third exhaust port; 31-Drive device; 32-Controller; 241-Through hole; 311-Power device; 312-Output slider; 313-Motor support frame; 313a-Isolation chamber; 314-Screw bushing; 315-Mounting housing; 316-Drive cylinder; 3111-Output shaft; 3131-Limit opening; m-Center negative pressure plug connector; n-Adapter connector. Embodiments of the present invention

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0045] In related technologies, the central negative pressure used for treating patient wounds is uniformly provided through the hospital's central control system. During use, the negative pressure is adjusted through the central control system and provided to the operating table at the end.

[0046] With the continuous advancement of wound care technology, intermittent negative pressure therapy is increasingly being adopted, which involves periodically applying and interrupting negative pressure suction at fixed time intervals. Intermittent negative pressure can stimulate tissue regeneration and inflammatory responses in the wound, promoting wound healing. While traditional central control systems in hospitals can achieve overall adjustment of negative pressure, their adjustment range is limited, their overall response speed is slow, and their adjustment costs are high, making them unsuitable for the structure of intermittent negative pressure therapy and thus limiting its effectiveness.

[0047] Figure 1 is a three-dimensional structural diagram of one side of the central negative pressure therapy device provided in an embodiment of the present invention. Figure 2 is a three-dimensional structural diagram of the other side of the central negative pressure therapy device provided in an embodiment of the present invention. Figure 3 is a front structural diagram of the central negative pressure therapy device provided in an embodiment of the present invention. Figure 4 is a three-dimensional structural diagram of the movable valve core in the first working position in an embodiment of the present invention. Figure 5 is a three-dimensional structural diagram of the movable valve core in the second working position in an embodiment of the present invention. Figure 6 is a three-dimensional structural block diagram of the driving device provided in an embodiment of the present invention. Figure 7 is a structural schematic diagram of another central negative pressure therapy device provided in an embodiment of the present invention. Figure 8 is a front structural schematic diagram of another central negative pressure therapy device provided in an embodiment of the present invention. Figure 9 is a structural schematic diagram of the two-position three-way structure in another central negative pressure therapy device provided in an embodiment of the present invention. Figure 10 is a structural schematic diagram of another driving device and the two-position three-way structure cooperating in an embodiment of the present invention. Figure 11 is a cross-sectional view of the structure in Figure 10 from another angle. Figure 12 is a block diagram of the control mechanism provided in an embodiment of the present invention. As shown in Figures 1 to 12, through practice, the applicant provides a central negative pressure therapy device, including: a pressure regulating valve 1, a two-position three-way structure 2, and a control mechanism 3.

[0048] The pressure regulating valve 1 includes a first air inlet 11 and a first air outlet 12. The two-position three-way structure 2 includes an inner cavity and a second air inlet 21, a second air outlet 22, and a first exhaust outlet 23 communicating with the inner cavity. The second air inlet 21 is connected to the first air outlet 12. A movable valve core 24 is provided in the inner cavity. The movable valve core 24 has a first working position in which it is recessed into the inner cavity to communicate with the second air inlet 21 and the second air outlet 22, and a second working position in which it extends out of the first exhaust outlet 23 to communicate with the outside through the first exhaust outlet 23. The control mechanism 3 includes a drive device 31 and a controller 32. The drive device 31 is connected to the two-position three-way structure 2 and is drively connected to the movable valve core 24. The controller 32 is electrically connected to the drive device 31.

[0049] In this embodiment of the invention, the central negative pressure treatment device is used as the terminal operating mechanism of central negative pressure. Before use, the second air outlet 22 on the two-position three-way structure 2 is connected to the central control system of the hospital that provides central negative pressure via the central negative pressure connector m. The first air inlet 11 is connected to the wound to be treated by the patient via a corresponding negative pressure suction tube or other medical device. During use, the hospital's central control system provides overall negative pressure, and medical staff adjust the negative pressure to the required value from the terminal by adjusting the opening of the pressure regulating valve 1. At the same time, according to the actual treatment needs, the controller 32 sends a control signal to control the drive device 31 in the control mechanism 3 to provide power to the movable valve core 24, driving the movable valve core 24 to extend and retract relative to the inner cavity of the two-position three-way structure 2. When the movable valve core 24 is in the first working position, submerged in the inner cavity, the second air inlet 21 and the second air outlet 22 are connected, the first exhaust outlet 23 is closed, and the two-position three-way structure 2 switches to the first passage. At this time, negative pressure can be used to suction the patient's wound. When the movable valve core 24 is in the second working position, with its tip extending beyond the first exhaust outlet 23, the passage between the second air inlet 21 and the second air outlet 22 is closed. The second air inlet 21 is connected to the outside atmosphere through the through hole 241 on the section of the movable valve core 24 extending beyond the first exhaust outlet 23. The two-position three-way structure 2 switches to the second passage, releasing the negative pressure at the end and stopping the negative pressure suction on the wound. By controlling the movable valve core 24 to repeatedly extend and retract between the first and second working positions at a certain interval frequency through the controller 32, the two-position three-way structure 2 can switch between the first and second passages, thus achieving intermittent negative pressure treatment at the patient's wound.

[0050] The central negative pressure therapy device provided in this embodiment of the invention can interface with the central control system of a hospital that provides central negative pressure via a two-position three-way structure 2. Manual adjustment of the hospital's central negative pressure can be achieved at the terminal by adjusting the opening of the pressure regulating valve 1. Simultaneously, electrical control can be achieved using a control mechanism 3 integrated with a controller 32. The drive device 31 drives the movable valve core 24 to extend and retract relative to the two-position three-way structure 2, switching the on / off state of the two-position three-way structure 2. This enables low-cost and precise rapid switching between continuous and intermittent negative pressure, overcoming the technical deficiencies in the personalized adjustment of central negative pressure for patients in related technologies.

[0051] It should be noted that, in this embodiment of the invention, the controller 32 can be a dedicated control device adapted to the central negative pressure therapy device, or it can be a device with corresponding control instructions set in the host computer. As long as it can send control signals to the drive device 31 according to a preset mode or frequency, and drive the movable valve core 24 to extend and retract between the first working position and the second working position to realize the on / off switching of the two-position three-way structure 2, this embodiment of the invention does not limit the specific structural form of the controller 32.

[0052] For example, in this embodiment of the invention, the two-position three-way structure 2 can be a commercially available two-position three-way mechanical valve. The connection structure between its inner cavity and the movable valve core 24 is not described in detail in this embodiment of the invention.

[0053] Optionally, the second air outlet 22 and the second air inlet 21 are located on opposite sides of the two-position three-way structure 2, the first exhaust port 23 is located at the top of the two-position three-way structure 2, the movable valve core 24 is retractably disposed in the first exhaust port 23, and the driving device 31 includes a power device 311 and an output slider 312. The output slider 312 is vertically and vertically disposed at the top of the two-position three-way structure 2 and connected to the movable valve core 24. The output slider 312 is drive-connected to the driving device 31. Exemplarily, in this embodiment of the invention, the power device 311 is a lead screw motor, the output shaft 3111 of the lead screw motor is parallel to the axis of the first exhaust port 23, and the output slider 312 is threadedly connected to the output shaft 3111. When the lead screw motor receives the control command from the controller 32, it drives its output shaft 3111 to rotate. One end of the output slider 312 is threaded and screwed onto the output shaft 3111. Since its other end is fixedly connected to the movable valve core 24, it does not rotate. Under the action of the threaded connection between the output shaft 3111 and the slider 312, the slider moves up and down relative to the output shaft 3111, following the forward and reverse rotation of the output shaft 3111, thereby driving the movable valve core 24 to move up and down. The lead screw-type output shaft 3111 and output slider 312 form a kinematic pair. The selected lead screw has a thread helix angle smaller than the equivalent friction angle, providing self-locking performance. Therefore, the output slider 312 can self-lock and remain at any position along the length of the output shaft 3111 without requiring continuous power supply. The structure is simple, with high response speed and driving accuracy, further reducing operating costs.

[0054] Optionally, the two-position three-way structure 2 includes an inner cavity and a third air inlet 25, a third air outlet 26, and a third exhaust outlet 27 communicating with the inner cavity. The third air inlet 25 is connected to the wound treatment instrument, and the third air outlet 26 is connected to the central negative pressure control mechanism. A movable valve core 24 is provided in the inner cavity. The movable valve core 24 has a third working position in which it extends out of the inner cavity to connect the third air inlet 25 with the third air outlet 26, and a fourth working position in which it sinks into the inner cavity to connect the third air inlet 25 with the outside through the third exhaust outlet 27. For example, referring to Figures 7 and 8, in another possible implementation of the present invention, the two-position three-way structure 2 differs somewhat from the embodiments in Figures 1 to 5. It also connects to a central negative pressure control structure on one side via a central negative pressure plug-in connector, and to a wound treatment instrument on the other side via the first air inlet 11 of the pressure regulating valve 1. The third air inlet 25 connects to the wound treatment instrument via the pressure regulating valve 1, the third air outlet 26 connects to the central control system providing central negative pressure in the hospital via the central negative pressure plug-in connector m, and the third exhaust outlet 27 directly communicates with the outside. The movable valve core 24 used is the same in shape as in the aforementioned embodiments, but it does not have a through hole 241 structure. The movable valve core 24 is driven by the drive device 31 to rise and fall between the third and fourth working positions to switch between negative pressure treatment and deflation conditions. During operation, the continuous negative pressure mode is used for most of the treatment, while the intermittent negative pressure mode is used for both continuous and intermittent negative pressure. Therefore, the movable valve core 24 is in the third working position, extended from the inner cavity, for most of the time. This reduces the pressing time of the output slider 312 in the drive device 31 on the movable valve core 24, and also reduces the duration of continuous stress between the movable valve core 24 and the connecting output shaft 3111, thereby extending the overall service life of the treatment device. Compared to the previous embodiment, where the drive device 31 is required to press down the movable valve core 24 each time switching to continuous negative pressure mode, this also reduces power consumption.

[0055] Optionally, the drive device 31 further includes a motor support frame 313, which has an isolation cavity 313a and is connected to the two-position three-way structure 2. The power device 311 is disposed in the isolation cavity 313a. Exemplarily, in this practical embodiment, a motor support frame 313 is also wrapped around the power device 311. The isolation cavity 313a isolates and protects the drive device 31, preventing damage from impacts or dust accumulation between the output slider 312 and the output shaft 3111, which could cause jamming and affect normal operation. At the same time, a limiting opening 3131 is provided on one side of the motor support frame 313 for the output slider 312 to move up and down. The opposite side walls of the limiting opening 3131 can further guide and limit the movement of the output slider 312, preventing it from rotating or shaking, and further improving the working stability of the central negative pressure therapy device.

[0056] Optionally, a lead screw sleeve 314 is provided on the top of the motor support frame 313, and the end of the output shaft 3111 is connected to the lead screw sleeve 314. Exemplarily, in this embodiment of the invention, the top plate of the motor support frame 313 is provided with a lead screw sleeve 314 for connecting to the end of the output shaft 3111. The lead screw sleeve 314 provides connection and support for the output shaft 3111, preventing the output shaft 3111 from bending due to the force point on the output slider 312 not being at the axis of the output shaft 3111, thus ultimately damaging the connection between the power unit 311 and the output shaft 3111 and ensuring overall operational stability. It can also work with the top plate of the motor support frame 313 to limit the upward movement of the output slider 312.

[0057] Optionally, the motor support frame 313 is detachably connected to the two-position tee structure 2. Exemplarily, in this embodiment of the invention, the motor support frame 313 has threaded holes at both ends, which are used to screw it onto the two-position tee structure 2. This design is simple and easy to assemble and disassemble. Related accessories can be replaced and maintained when the central negative pressure therapy device is not in use or after prolonged operation, thus improving the overall service life of the central negative pressure therapy device.

[0058] It should be noted that, in this embodiment of the invention, the control mechanism 3 that drives the movable valve core 24 to rise and fall can also be controlled and driven by a commercially available solenoid valve. Compared with the control mechanism 3 in this solution, it has better integration, but the response cost is also higher.

[0059] As shown in Figures 10 and 11, in another two-position three-way structure 2 shown in Figures 7 and 8, different driving devices 31 are used to press the movable valve core 24. In this embodiment, the driving device uses a mounting housing 315 directly mounted on the top of the two-position three-way structure 2 to support the driving cylinder 316 installed inside. The piston rod of the driving cylinder 316 faces the movable valve core 24. The driving cylinder 216 is controlled by an external control device. By controlling the extension and retraction of the piston rod of the driving cylinder 216, the movable valve core 24 can be pressed or released, ensuring that the pressing force is coaxial with the movable valve core 24. Compared with the embodiment in Figure 6, the integration is better. There is no need for the output slider 312 to press indirectly, and there is no pressing force loss caused by indirect drive, which effectively improves the response and adjustment efficiency.

[0060] Optionally, the pressure regulating valve 1 is provided with a pressure regulating knob 13. For example, referring to Figures 7 and 8, in this embodiment of the invention, medical personnel can adjust the opening of the pressure regulating valve 1 using the pressure regulating knob 13 to ensure the accuracy and stability of the negative pressure, thereby achieving a pressure stabilizing effect.

[0061] It should be noted that in the embodiments shown in Figures 7 and 8, by turning the pressure regulating knob 13, the pressure regulating spring inside the pressure regulating knob 13 applies pressure to the diaphragm, which pushes the valve stem to drive the internal valve core to move and adjust the opening size. Through the balance of the internal valve plate, the air pressure between the inlet and outlet air chambers is continuously and stably adjusted. When the central negative pressure changes, the pressure on the wound at the end of the negative pressure suction tube and other medical devices can remain basically unchanged.

[0062] For example, in another possible implementation, referring to Figures 1 and 2, the pressure regulating valve 1 can be equipped with a pressure regulating knob 13 and a fine-tuning knob 14 with two different opening adjustment ranges and adjustment amplitudes. Medical staff can change the pipeline gap inside the valve by adjusting the pressure regulating knob 13 and the fine-tuning knob 14, thereby adjusting the negative pressure in a gradient manner to ensure the accuracy of adjustment.

[0063] Optionally, the second air inlet 21 and the first air outlet 12 are detachably connected. For example, in this embodiment of the invention, the second air inlet 21 of the two-position three-way structure 2 and the first air outlet 12 of the pressure regulating valve 1 are bidirectionally detachably connected via an adapter connector n, facilitating replacement and maintenance.

[0064] Optionally, the first air inlet 11 is a pagoda-shaped interface. For example, in this embodiment of the invention, the first air inlet 11 adopts a pagoda-shaped interface, whose quick-connect design allows for rapid and convenient connection with medical devices such as negative pressure suction tubes, effectively improving the working efficiency of the central negative pressure therapy device.

[0065] Optionally, the central negative pressure treatment device also includes an alarm, which is electrically connected to the controller 32. Exemplarily, referring to FIG12, in this embodiment of the invention, the controller 32 also integrates multiple detection circuits, including at least a motor direction control circuit, a current monitoring circuit, and a voltage monitoring circuit. The motor direction control circuit and the current monitoring circuit work together to control the lead screw motor for the controller 32. When the wound needs to be connected to the central negative pressure, the motor direction control circuit controls the lead screw motor to rotate forward, the output slider 312 begins to press down, and the controller counter starts counting. When the output slider 312 is fully depressed, the lead screw motor stops, and the current through the motor increases. When the controller 32 detects that the current has risen to a specific threshold Vh1, the controller 32 controls the motor to stop, and the counter is reset to zero. If the current does not exceed the threshold Vh1 when the controller 32 counter reaches the set threshold T1, the controller 32 also controls the motor to stop, and the counter is reset to zero.

[0066] When negative pressure needs to be released from the wound, controller 32 sends a reverse command to the lead screw motor, and simultaneously, controller 32's counter starts counting. The lead screw motor reverses, and the output slider 312 begins to move upwards. When the output slider 312 reaches its upper end, it is restricted by the structure and can no longer rotate. The current through the motor inside the lead screw motor will increase. When controller 32 detects that the current has risen to a specific threshold Vh1, controller 32 controls the motor to stop, and simultaneously resets the counter to zero. If the current does not exceed the threshold Vh1 when controller 32's counter reaches the set threshold T1, controller 32 also controls the motor to stop, and simultaneously resets the counter to zero.

[0067] The voltage monitoring circuit detects the power supply voltage for the central negative pressure therapy device. When the power supply voltage is lower than the preset voltage VL1, the system operates normally, and the controller 32 sends an alarm signal ER1 to remind the user to replace the battery. When the power supply voltage is lower than the preset voltage VL2, the system will perform the wound release operation mentioned above and send an alarm signal to prevent loss of control and discomfort caused by continuous negative pressure suction to the patient.

[0068] It should be noted that the alarm can be an alarm signal generating unit integrated into the controller, outputting only digital alarm signals for display on the corresponding host computer. Alternatively, the alarm can be a physical audible and visual alarm, providing a more direct reminder to medical staff to replace batteries or perform on / off operations.

[0069] Figure 13 is a flowchart of a negative pressure therapy method provided by an embodiment of the present invention. As shown in Figure 13, the present invention also provides a negative pressure therapy method based on the central negative pressure therapy device described in Figures 1 to 11. The negative pressure therapy method includes:

[0070] S1. Connect one end of the two-position three-way structure 2 to the central negative pressure supply system, and the other end to the wound treatment device.

[0071] Specifically, in this step, the second air outlet 22 of the two-position three-way structure 2 is connected to the central negative pressure supply system, and the first air inlet 11 is connected to the wound to be treated by the patient through the wound treatment instrument.

[0072] S2. The control mechanism 3 controls the two-position three-way structure 2, driving the first passage of the two-position three-way structure 2 to conduct, so as to perform continuous negative pressure treatment on the wound to be treated by the wound treatment instrument.

[0073] Specifically, in this step, the controller 32 controls the drive device 31 to drive the movable valve core 24 to move to the first working position so as to perform continuous negative pressure treatment on the wound to be treated by the wound treatment instrument.

[0074] or,

[0075] S3. The control mechanism 3 controls the two-position three-way structure 2, driving the two-position three-way structure 2 to switch between the first and second channels at a preset frequency, so as to perform intermittent negative pressure treatment on the wound to be treated by the wound treatment instrument.

[0076] Specifically, in this step, the controller 32 controls the drive device 31 to drive the movable valve core 24 to extend and retract between the first working position and the second working position at a preset frequency, so as to provide intermittent negative pressure treatment to the wound to be treated on the patient.

[0077] The central negative pressure therapy device provided in this embodiment of the invention can interface with the central control system of a hospital that provides central negative pressure via a two-position three-way structure 2. Manual adjustment of the hospital's central negative pressure can be achieved at the terminal by adjusting the opening of the pressure regulating valve 1. Simultaneously, electrical control can be achieved using a control mechanism 3 integrated with a controller 32. The drive device 31 drives the movable valve core 24 to extend and retract relative to the two-position three-way structure 2, switching the on / off state of the two-position three-way structure 2. This enables low-cost and precise rapid switching between continuous and intermittent negative pressure.

[0078] Optionally, in step S3, when the control mechanism 3 performs intermittent negative pressure therapy on the patient, it can cycle through a frequency of opening the first pathway for 5 minutes, followed by opening the second pathway for 2 minutes. Based on the size of the patient's affected area and their comfort level, the control mechanism can intelligently or manually provide a negative pressure ranging from 0 to -450 mmHg. Using the aforementioned preset frequency and negative pressure, based on clinical trials, best reflects the pathological cycle of wound repair, is most conducive to cell mitosis and protein synthesis, promotes the regeneration of various tissues and granulation tissue growth, and accelerates the wound healing process.

[0079] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the element or object preceding “comprising” or “including” encompasses all elements or objects listed following “comprising” or “including” and are identical to them, but do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. “Up,” “down,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0080] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A central negative pressure therapy device, characterized in that, include: The two-way three-way structure (2) is disposed between the wound treatment device and the central negative pressure control mechanism. The two-way three-way structure (2) has a first passage connecting the wound treatment device and the central negative pressure control mechanism, and a second passage connecting the wound treatment device and the normal pressure environment. The control mechanism (3) is used to control the two-position three-way structure to switch between the first channel and the second channel to achieve intermittent negative pressure treatment at the patient's wound.

2. The central negative pressure therapy device according to claim 1, characterized in that, The two-position three-way structure (2) includes an inner cavity and a second air inlet (21), a second air outlet (22) and a first exhaust outlet (23) connected to the inner cavity. The second air inlet (21) is connected to the wound treatment device, and the second air outlet (22) is connected to the central negative pressure control mechanism. A movable valve core (24) is provided in the inner cavity. The movable valve core (24) has a first working position in which it sinks into the inner cavity to connect the second air inlet (21) and the second air outlet (22), and a second working position in which it extends out of the first exhaust outlet (23) to connect the second air inlet (21) to the outside through the first exhaust outlet (23). The control mechanism (3) is drivenly connected to the movable valve core (24).

3. The central negative pressure therapy device according to claim 2, characterized in that, The two-position three-way structure (2) includes an inner cavity and a third air inlet (25), a third air outlet (26) and a third air outlet (27) connected to the inner cavity. The third air inlet (25) is connected to the wound treatment instrument, and the third air outlet (26) is connected to the central negative pressure control mechanism. The inner cavity is provided with the movable valve core (24). The movable valve core (24) has a third working position in which it extends out of the inner cavity to connect the third air inlet (25) with the third air outlet (26), and a fourth working position in which it sinks into the inner cavity to connect the third air inlet (25) with the outside through the third air outlet (27).

4. The central negative pressure therapy device according to claim 3, characterized in that, The control mechanism (3) includes a drive device (31) and a controller (32). The drive device (31) is connected to the two-position three-way structure (2) and is drivenly connected to the movable valve core (24). The controller (32) is electrically connected to the drive device (31).

5. The central negative pressure therapy device according to claim 4, characterized in that, The drive device (31) includes a power device (311) and an output slider (312). The output slider (312) is vertically mounted on the top of the two-position three-way structure (2) and connected to the movable valve core (24). The output slider (312) is connected to the drive device (31) in a transmission manner.

6. The central negative pressure therapy device according to claim 5, characterized in that, The power device (311) is a lead screw motor, and the output shaft (3111) of the lead screw motor is fitted onto the output slider (312).

7. The central negative pressure therapy device according to claim 6, characterized in that, The drive device (31) also includes a motor support frame (313), which has an isolation cavity (313a) and is connected to the two-position three-way structure (2). The power device (311) is disposed in the isolation cavity (313a).

8. The central negative pressure therapy device according to claim 7, characterized in that, The motor support frame (313) is provided with a lead screw bushing (314) on the top, and the end of the output shaft (3111) is connected to the lead screw bushing (314).

9. The central negative pressure therapy device according to claim 4, characterized in that, The drive device (31) includes a mounting housing (315) and a drive cylinder (316). The drive cylinder (316) is mounted on the top of the two-position three-way structure (2) through the mounting housing (315), and the drive shaft is coaxially connected to the movable valve core (24).

10. The central negative pressure therapy device according to claim 3, characterized in that, The central negative pressure treatment device also includes a pressure regulating valve (1), which includes a first air inlet (11) and a first air outlet (12). The second air inlet (21) is connected to the first air outlet (12), and the first air outlet (12) is connected to the wound treatment instrument.

11. The central negative pressure therapy device according to claim 10, characterized in that, The pressure regulating valve (1) is equipped with a pressure regulating knob (13).

12. The central negative pressure therapy device according to any one of claims 1 to 11, characterized in that, The central negative pressure treatment device also includes an alarm, which is electrically connected to the control mechanism (3).

13. A negative pressure therapy method, implemented based on the central negative pressure therapy device as described in any one of claims 1 to 11, characterized in that, include: Connect one end of the two-position three-way structure (2) to the central negative pressure supply system and the other end to the wound treatment device; The control mechanism (3) is used to control the two-position three-way structure (2) to drive the first passage of the two-position three-way structure (2) to open, so as to perform continuous negative pressure treatment on the wound to be treated by the wound treatment device. or, The control mechanism (3) is used to control the two-position three-way structure (2) and drive the two-position three-way structure (2) to switch between the first channel and the second channel at a preset frequency so as to perform intermittent negative pressure treatment on the wound to be treated by the wound treatment device.

14. The negative pressure therapy method according to claim 13, characterized in that, The control mechanism (3) controls the two-position three-way structure (2), driving it to switch between the first and second channels at a preset frequency, so as to provide intermittent negative pressure treatment to the wound to be treated by the wound treatment device, including: The control mechanism (3) controls the two-way three-way structure (2) in an alternating manner of opening the first passage in a first time period and opening the second passage in a second time period, the first time period and the second time period being 1 to 30 minutes, and provides a negative pressure between 0 and -450 mmHg when switching to the first passage.

Images