Infusion heating device

Abstract

An infusion heating device, characterized in that it includes a shell, a heating device, a fan, a temperature sensor and a control circuit, the shell is provided with a hot air supply channel and an infusion tube heating channel, the air outlet of the hot air supply channel is connected with the air inlet of the infusion tube heating channel, the fan is installed on the hot air supply channel, the heating device is arranged in the hot air supply channel, the temperature sensor is electrically connected to the corresponding input end of the control circuit, and the heating device is electrically connected to the corresponding output end of the control circuit. The present invention utilizes the heat exchange between the hot air and the infusion tube to heat the infusion tube and the liquid inside it more evenly and increase its temperature, and avoids excessive temperature through temperature detection and control, so that the liquid infused into the patient's body during the infusion process maintains a suitable temperature, effectively avoids the patient from feeling uncomfortable during the infusion process, and ensures the infusion treatment effect and infusion safety.

Description

Technical Field

[0001] The invention relates to medical equipment, in particular to an infusion heating device. Background Art

[0002] Infusion is a common treatment method. In cold winter, or when the temperature of the infused liquid itself is low (especially when the infused liquid is refrigerated), when infusion is performed, the temperature of the liquid (medicine or blood) infused into the human body is too low, which will cause the patient to feel cold and easily stimulate the blood vessels, causing the patient to feel uncomfortable and even affecting the treatment effect. At present, most infusion heating devices are used to heat the infusion bottle (or infusion bag) or infusion tube, thereby indirectly heating the liquid therein to increase the temperature of the liquid infused into the patient's body.

[0003] However, the existing infusion heating devices often have too high a temperature when heating the infused liquid (for example, when the liquid flow in the infusion tube is too small or paused, the temperature of the infused liquid is often too high), but they cannot quickly cool down to a suitable temperature. The high infusion temperature will also cause the patient to feel uncomfortable. What is more serious is that during blood transfusion, if the temperature of the transfused blood is too high, it will cause the cells in the blood to die and clot, causing the blood to lose its function, and even form blood clots after being transfused into the human body, resulting in medical accidents.

[0004] Therefore, developing an infusion heating device that can quickly heat or cool the infused liquid during the infusion process to keep the infused liquid at an appropriate temperature is very important for reducing patient discomfort and ensuring treatment effectiveness and patient safety. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide an infusion heating device, which can keep the liquid infused into the patient's body at a suitable temperature during the infusion process. The technical solution adopted is as follows:

[0006] An infusion heating device, characterized in that it includes a shell, a heating device, a fan, a temperature sensor and a control circuit, the shell is provided with a hot air supply channel and an infusion tube heating channel, the air outlet end of the hot air supply channel is connected to the air inlet end of the infusion tube heating channel, the fan is installed on the hot air supply channel, the heating device is arranged in the hot air supply channel, the temperature sensor is electrically connected to the corresponding input end of the control circuit, and the heating device is electrically connected to the corresponding output end of the control circuit.

[0007] The above-mentioned fan can be electrically connected to the corresponding output terminal of the control circuit; the fan can also be directly connected to the power supply. The temperature sensor can be installed in the heating channel of the infusion tube, in the shell or on the surface of the shell. The above-mentioned infusion heating device can also include a display screen, which is installed on the surface of the shell. The display screen is electrically connected to the corresponding output terminal of the control circuit, and the display screen can display the temperature value detected by the temperature sensor. The control circuit can adopt a single-chip microcomputer or a CPU.

[0008] When the above-mentioned infusion heating device is used, a section of infusion tube is placed in the infusion tube heating channel; after the power is turned on, driven by the fan, air enters the hot air supply channel from the air inlet end of the hot air supply channel, and flows through the hot air supply channel and the infusion tube heating channel in sequence. When the air flows through the hot air supply channel, it is heated and heated by the heating device to form hot air. When the hot air flows through the infusion tube heating channel, it heats the infusion tube so that the liquid inside it is heated and heated, and then the hot air is discharged from the air outlet end of the infusion tube heating channel. The temperature sensor can detect the wall temperature of the infusion tube between the infusion tube heating channel and the infusion needle (the detection point of the temperature sensor is close to the infusion tube heating channel; the wall temperature can reflect the temperature of the liquid in the infusion tube), and transmit the temperature value to the control circuit. When the temperature value detected by the temperature sensor is lower than or equal to the preset temperature value, the control circuit sends a control signal to keep the heating device powered on, continuously heats the air flowing through the hot air supply channel, and makes the air in the heating channel of the infusion tube have a sufficiently high temperature, which can heat the infusion tube and the liquid inside it and increase its temperature. When the temperature value detected by the temperature sensor is higher than the preset temperature value, the control circuit sends a control signal to turn off the power of the heating device, and no longer heats the air flowing through the hot air supply channel. At this time, the air flowing through the heating channel of the infusion tube can reduce the temperature of the infusion tube and the liquid inside it. In this way, the above-mentioned infusion heating device can keep the infused liquid at a suitable temperature during the infusion process. Usually, the comfortable infusion temperature of the human body is about 28-37℃. Considering the different distances from the placement of the infusion heating device to the infusion needle, the liquid is slightly cooled during transportation. Therefore, the temperature preset value for a long distance can be set between 32-37℃ (for example, 35℃); the temperature preset value for a short distance can be set between 28-34℃ (for example, 31℃). Preferably, the control circuit can adjust the heating power of the heating device according to the temperature value detected by the temperature sensor, for example: if the detected temperature value is low, the heating power is increased, and if the detected temperature value is high, the heating power is decreased.

[0009] The temperature sensor can also detect the air temperature inside the heating channel of the infusion tube and transmit the temperature value to the control circuit; when the temperature value detected by the temperature sensor is lower than the preset temperature value, the control circuit sends a control signal to keep the heating device powered on or increase the heating power (when the temperature value detected by the temperature sensor is equal to the preset temperature value, the heating power can be kept unchanged), heat the air flowing through the hot air supply channel, and increase or increase the air temperature in the heating channel of the infusion tube; when the temperature value detected by the temperature sensor is higher than the preset temperature value, the control circuit sends a control signal to turn off the power of the heating device or reduce the heating power, and no longer heat the air flowing through the hot air supply channel or reduce the heating intensity. By controlling the power on and off of the heating device and / or adjusting the power, the air temperature inside the heating channel of the infusion tube is kept near the preset temperature value; the air temperature inside the heating channel of the infusion tube can indirectly affect the temperature of the liquid inside the infusion tube after heating. In actual use, the air temperature inside the heating channel of the infusion tube is usually slightly higher than the liquid temperature inside the infusion tube after heating. In this case, the preset temperature value can be set between 35-41°C (for example, 38°C).

[0010] In the infusion tube heating channel, the flow direction of the air may be the same as the flow direction of the liquid in the infusion tube, or may be opposite to the flow direction of the liquid in the infusion tube.

[0011] In the preferred embodiment, the above-mentioned infusion tube heating channel is surrounded by a strip groove arranged on the surface of the shell and two elastic sealing strips arranged on both sides of the top opening of the strip groove. The outer edges of the two elastic sealing strips are respectively connected to the tops of the two side walls of the strip groove, and the inner edges of the two elastic sealing strips are in contact with each other. The strip groove can be straight or curved (such as U-shaped). The elastic sealing strip can be made of rubber or thermoplastic elastomer. When the infusion tube is loaded into the infusion tube heating channel, a section of the infusion tube can be placed at the junction of the inner edges of the two elastic sealing strips along the extension direction of the strip groove, and then the section of the infusion tube is pressed into the strip groove (the two elastic sealing strips undergo elastic deformation during the pressing process), and then the two elastic sealing strips rebound, and the inner edges of the two elastic sealing strips are restored to a state of contact with each other; when the infusion tube needs to be taken out, the infusion tube can be pulled out from the junction of the inner edges of the two elastic sealing strips. This structure makes the installation and removal between the infusion heating device and the infusion tube quite convenient and quick.

[0012] In a more preferred embodiment, both ends of the strip groove are provided with an end opening, and both ends of the elastic sealing strip are provided with an end opening sealing part, and the inner edge of each end opening sealing part is provided with a semicircular notch, and the positions of the semicircular notches on the end opening sealing parts of the same end of the two elastic sealing strips correspond to each other. When the infusion tube is inserted into the strip groove, at both ends of the strip groove, the infusion tube is in a circular hole surrounded by the semicircular notches on the end opening sealing parts of the same end of the two elastic sealing strips, and the circular hole plays a positioning role for the infusion tube. Usually, the radius of the semicircular notch is roughly equal to the radius of the infusion tube. After the infusion tube is inserted, the tube wall of the infusion tube can be in close contact with the inner wall of the semicircular notch, so as to achieve a good seal and reduce air leakage.

[0013] A vent hole can be respectively arranged at the groove bottom at both ends of the strip-shaped groove, and the two vent holes respectively constitute the air inlet end and the air outlet end of the heating channel of the infusion tube.

[0014] In a more preferred embodiment, the housing is provided with two infusion tube supports, which correspond to the two ends of the strip groove, and the infusion tube supports are provided with a card slot. When the infusion tube is inserted into the strip groove, the parts of the infusion tube extending from the two ends of the strip groove are respectively embedded in the card slots on the two infusion tube supports, which can further prevent the infusion tube from being misplaced or detached from the infusion heating device during the infusion heating process. The infusion tube support can be made of plastic.

[0015] In a more preferred embodiment, a plurality of protrusions are provided at the bottom of the strip groove. When the infusion tube is installed into the strip groove, after the infusion tube contacts the protrusions, the protrusions can support and limit the infusion tube, so that a certain distance is maintained between the infusion tube and the bottom of the strip groove, thereby allowing the infusion tube to more fully exchange heat with the air flow.

[0016] In the preferred embodiment, the air outlet of the infusion tube heating channel is connected to the air inlet of the hot air supply channel. In this case, the hot air supply channel and the infusion tube heating channel form an annular gas channel, and the air circulates in the annular gas channel driven by the fan. After the hot air in the infusion tube heating channel heats the infusion tube and the liquid inside it, the temperature of the air sent out from the air outlet of the infusion tube heating channel decreases. After entering the hot air supply channel, it is heated by the heating device and re-enters the infusion tube heating channel. Since the temperature of the air sent out from the air outlet of the infusion tube heating channel is usually higher than the outside air temperature, recycling this air is beneficial to reduce energy consumption.

[0017] When the hot air supply channel and the infusion tube heating channel form an annular gas channel, the temperature can be controlled in one of the following two ways:

[0018] (1) The temperature sensor can detect the wall temperature of the infusion tube between the infusion tube heating channel and the infusion needle (the wall temperature can reflect the temperature of the liquid in the infusion tube), and transmit the temperature value to the control circuit; when the temperature value detected by the temperature sensor is lower than or equal to the preset temperature value, the control circuit sends a control signal to keep the heating device powered on, continuously heat the air flowing through the hot air supply channel, so that the air in the infusion tube heating channel has a sufficiently high temperature, which can heat the infusion tube and the liquid inside it and increase its temperature; when the temperature value detected by the temperature sensor is higher than the preset temperature value, the control circuit sends a control signal to turn off the power of the heating device, and no longer heat the air flowing through the hot air supply channel. At this time, the temperature of the air flowing through the infusion tube heating channel decreases, which can reduce the temperature of the infusion tube and the liquid inside it. Preferably, the control circuit can adjust the heating power of the heating device according to the temperature value detected by the temperature sensor, for example: if the detected temperature value is low, the heating power is increased, and if the detected temperature value is high, the heating power is decreased. Generally, a comfortable infusion temperature for the human body is about 28-37°C. Taking into account the different distances from the placement of the infusion heating device to the infusion needle, the liquid will cool down slightly during transportation. Therefore, the temperature preset value for a long distance can be set between 32-37°C (for example, 35°C); the temperature preset value for a short distance can be set between 28-34°C (for example, 31°C).

[0019] Or (2) the temperature sensor detects the air temperature inside the heating channel of the infusion tube and transmits the temperature value to the control circuit; when the temperature value detected by the temperature sensor is lower than the preset temperature value, the control circuit sends a control signal to keep the heating device powered on or increase the heating power (when the temperature value detected by the temperature sensor is equal to the preset temperature value, the heating power can be kept unchanged), heat the air flowing through the hot air supply channel, and increase or increase the air temperature in the heating channel of the infusion tube; when the temperature value detected by the temperature sensor is higher than the preset temperature value, the control circuit sends a control signal to turn off the power of the heating device or reduce the heating power, and no longer heat the air flowing through the hot air supply channel or reduce the heating intensity. By controlling the power on and off of the heating device and / or adjusting the power, the air temperature inside the heating channel of the infusion tube is kept near the preset temperature value; the air temperature inside the heating channel of the infusion tube can indirectly reflect the temperature of the liquid inside the infusion tube after heating. In actual use, the air temperature inside the heating channel of the infusion tube is usually slightly higher than the liquid temperature inside the infusion tube after heating. In this case, the preset temperature value can be set between 35-41°C (for example, 38°C).

[0020] In a more preferred embodiment, the hot air supply channel is provided with an air inlet and an air outlet, and the air inlet, fan, infusion tube heating channel and air outlet are arranged in sequence along the air flow direction, and the hot air supply channel is provided with an air flow direction switching mechanism for switching the air flow direction in the hot air supply channel; the air flow direction switching mechanism can switch the air flow direction in the hot air supply channel between the following two states: in a first state, the air inlet and the air outlet are both closed, and the hot air supply channel is connected (air can circulate in the annular gas channel composed of the infusion tube heating channel and the hot air supply channel); in a second state, the air inlet and the air outlet are both open, and the hot air supply channel is partially separated between the air inlet and the air outlet (outside air enters the hot air supply channel on the air inlet side from the air inlet, flows through the infusion tube heating channel, and is discharged through the hot air supply channel on the air outlet side and the air outlet). When in use, before starting the fan and the heating device, the air flow direction can be first placed in the second state. At this time, the outside air enters the hot air supply channel and the infusion tube heating channel through the air inlet and the air outlet, so that the hot air supply channel and the infusion tube heating channel are filled with air; then start the fan and the heating device, and switch the air flow direction to the first state. The fan drives the air to circulate in the annular gas channel. When the air flows through the hot air supply channel, it is heated and heated by the heating device to form hot air. When the hot air flows through the infusion tube heating channel, it heats the infusion tube and the liquid inside it and causes it to heat up. When the temperature value detected by the temperature sensor is higher than the preset temperature value, the control circuit sends a control signal to cut off the power to the heating device. At the same time, the air flow direction is switched to the second state. At this time, the colder air from the outside enters the hot air supply channel on the air inlet side from the air inlet, flows through the infusion tube heating channel and cools the infusion tube and the liquid inside it, and then is discharged through the hot air supply channel on the air outlet side and the air outlet. Since in this state the colder air from the outside can continuously enter the infusion tube heating channel and continuously cool the infusion tube and the liquid inside it, the infusion tube and the liquid inside it can be quickly cooled down.

[0021] In a further preferred embodiment, the air flow direction switching mechanism includes a driving motor, an air inlet baffle, an air outlet baffle and a baffle shaft, the air inlet and the air outlet are arranged on the side wall of the hot air supply channel and arranged side by side in front and back, the baffle shaft can be rotatably mounted on the housing and is located between the air inlet and the air outlet, the driving motor is mounted on the housing, the power output shaft of the driving motor is transmission-connected to the baffle shaft, and the driving motor is electrically connected to the corresponding output end of the control circuit. The air flow direction switching mechanism switches between the following two states: in the first state, the air inlet baffle and the air outlet baffle respectively close the air inlet and the air outlet, and the hot air supply channel is connected; in the second state, the driving motor drives the baffle shaft to rotate a certain angle (such as 90 degrees) under the control of the control circuit, so that the air inlet baffle leaves the air inlet, and the air outlet baffle leaves the air outlet, and the air inlet baffle or the air outlet baffle enters the hot air supply channel, and the hot air supply channel is partially separated between the air inlet and the air outlet.

[0022] In another further preferred embodiment, the air flow direction switching mechanism includes a two-position four-way solenoid valve, which is electrically connected to the corresponding output end of the control circuit; the hot air supply channel is disconnected at the two-position four-way solenoid valve, and the disconnection forms the air inlet and the air outlet, the air inlet and the air outlet are respectively connected to the corresponding passage openings on the valve body of the two-position four-way solenoid valve, and the remaining two passage openings on the valve body of the two-position four-way solenoid valve are connected to the outside. The air flow direction switching mechanism switches between the following two states: in the first state, the air inlet and the air outlet are connected through the valve core of the two-position four-way solenoid valve, and the hot air supply channel is connected; in the second state, the two-position four-way solenoid valve switches the valve core position under the control of the control circuit, and the valve core of the two-position four-way solenoid valve connects the air inlet with the outside (can introduce outside air), and at the same time connects the air outlet with the outside (can discharge the air flowing through the heating channel of the infusion tube to the outside).

[0023] When the hot air supply channel and the infusion tube heating channel form an annular gas channel, the installation position of the fan can adopt one of the following three methods.

[0024] In the first scheme, the hot air supply channel includes a first hot air supply channel section and a second hot air supply channel section, the air outlet end of the infusion tube heating channel is connected to the air inlet end of the first hot air supply channel section, the air outlet end of the first hot air supply channel section is connected to the air inlet of the fan, the air outlet of the fan is connected to the air inlet end of the second hot air supply channel section, and the air outlet end of the second hot air supply channel section is connected to the air inlet end of the infusion tube heating channel; the air inlet and the air outlet are arranged on the first hot air supply channel section; the heating device is arranged in the first hot air supply channel section or the second hot air supply channel section. In this case, the cavity of the fan serves as a part of the hot air supply channel. Preferably, the heating device is arranged in the first hot air supply channel section, so that when the infusion tube needs to be cooled, even if a fault occurs and the heating device cannot be powered off, it can still be ensured that colder air is passed into the infusion tube heating channel.

[0025] In the second solution, the air outlet of the hot air supply channel is connected to the air inlet of the fan, the air outlet of the fan is connected to the air inlet of the infusion tube heating channel, and the air outlet of the infusion tube heating channel is connected to the air inlet of the hot air supply channel. In this case, the air outlet of the hot air supply channel is connected to the air inlet of the infusion tube heating channel through the cavity of the fan.

[0026] In the third solution, the air outlet of the heating channel of the infusion tube is connected to the air inlet of the fan, the air outlet of the fan is connected to the air inlet of the hot air supply channel, and the air outlet of the hot air supply channel is connected to the air inlet of the heating channel of the infusion tube. In this case, the air outlet of the heating channel of the infusion tube is connected to the air inlet of the hot air supply channel through the cavity of the fan.

[0027] The present invention utilizes the heat exchange between hot air and the infusion tube to heat the infusion tube and the liquid inside it more evenly and quickly and raise its temperature, and avoids excessive temperature through temperature detection and control (when the temperature is detected to be too high, the infusion tube and the liquid inside it can be cooled more quickly), so that the liquid injected into the patient's body during the infusion process maintains a suitable temperature, effectively avoiding the patient from feeling uncomfortable during the infusion process, and ensuring the therapeutic effect and safety of the infusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure and working principle of the preferred embodiment 1 of the present invention (circulation heating state);

[0029] Figure 2 It is a schematic diagram of the structure and working principle of the preferred embodiment 1 of the present invention (cooling state);

[0030] Figure 3 is a schematic diagram of the structure of the preferred embodiment 1 of the present invention (a state in which an infusion tube is installed);

[0031] Figure 4 yes Figure 3 AA section view of the heating channel of the middle infusion tube;

[0032] Figure 5 It is a circuit principle block diagram of a preferred embodiment 1 of the present invention;

[0033] Figure 6 is a schematic structural diagram of the strip-shaped groove in the preferred embodiment 1 of the present invention;

[0034] Figure 7 It is a structural schematic diagram of a preferred embodiment 2 of the present invention;

[0035] Figure 8 This is a schematic diagram of pipeline connection in preferred embodiment 3 of the present invention. DETAILED DESCRIPTION

[0036] Example 1

[0037] like Figure 1-Figure 5 As shown, the infusion heating device includes a shell 1, a heating device 2, a fan 3, a temperature sensor 4 and a control circuit 5. The shell 1 is provided with a hot air supply channel 6 and an infusion tube heating channel 7. The air outlet end of the hot air supply channel 6 is connected with the air inlet end of the infusion tube heating channel 7, and the air outlet end of the infusion tube heating channel 7 is connected with the air inlet end of the hot air supply channel 6. The fan 3 is installed on the hot air supply channel 6, the heating device 2 is arranged in the hot air supply channel 6, the temperature sensor 4 is electrically connected to the corresponding input end of the control circuit 5, and the heating device 2 is electrically connected to the corresponding output end of the control circuit 5.

[0038] In this embodiment, an air inlet 63 and an air outlet 64 are provided on the hot air supply channel 6. The air inlet 63, the fan 3, the infusion tube heating channel 7, and the air outlet 64 are arranged in sequence along the air flow direction. The hot air supply channel 6 is provided with an air flow direction switching mechanism for switching the air flow direction in the hot air supply channel; the air flow direction switching mechanism can switch the air flow direction in the hot air supply channel between the following two states: in the first state, the air inlet 63 and the air outlet 64 are both closed, and the hot air supply channel 6 is connected; in the second state, the air inlet 63 and the air outlet 64 are both open, and the hot air supply channel 6 is partially separated between the air inlet 63 and the air outlet 64.

[0039] The air flow switching mechanism of this embodiment includes a driving motor 81, an air inlet baffle 82, an air outlet baffle 83 and a baffle shaft 84. The air inlet 63 and the air outlet 64 are arranged on the side wall of the hot air supply channel 6 and are arranged side by side in front and back. The baffle shaft 84 can be rotatably mounted on the housing 1 and is located between the air inlet 63 and the air outlet 64. The driving motor 81 is mounted on the housing 1. The power output shaft of the driving motor 81 is transmission-connected to the baffle shaft 84. The driving motor 81 is electrically connected to the corresponding output end of the control circuit 5. The air flow switching mechanism switches between the following two states: Figure 1 In the first state, the air inlet baffle 82 and the air outlet baffle 83 respectively close the air inlet 63 and the air outlet 64, and the hot air supply channel 6 is connected (the air can circulate in the annular gas channel composed of the infusion tube heating channel 7 and the hot air supply channel 6); refer to Figure 2 In the second state, the driving motor 81 drives the baffle shaft 84 to rotate a certain angle (such as 90 degrees) under the control of the control circuit 5, so that the air inlet baffle 82 leaves the air inlet 63, and at the same time, the air outlet baffle 83 leaves the air outlet 64, and the air inlet baffle 82 (or the air outlet baffle 83) enters the hot air supply channel 6, and the part of the hot air supply channel 6 between the air inlet 63 and the air outlet 64 is isolated.

[0040] In this embodiment, the hot air supply channel 6 includes a first hot air supply channel section 61 and a second hot air supply channel section 62. The air outlet of the infusion tube heating channel 7 is connected to the air inlet of the first hot air supply channel section 61. The air outlet of the first hot air supply channel section 61 is connected to the air inlet 31 of the fan 3. The air outlet 32 ​​of the fan 3 is connected to the air inlet of the second hot air supply channel section 62. The air outlet of the second hot air supply channel section 62 is connected to the air inlet of the infusion tube heating channel 7. The air inlet 63 and the air outlet 64 are arranged on the first hot air supply channel section 61. The heating device 2 is arranged in the first hot air supply channel section 61 (in this embodiment, the heating device 2 uses a heating wire as a heating component, and the heating wire is in the first hot air supply channel section 61). The cavity of the fan 3 serves as a part of the hot air supply channel 6. When the air flow switching mechanism is switched to the second state, the outside air enters the hot air supply channel on the air inlet side (the first hot air supply channel section 61 close to the fan 3, the air inlet 31 of the fan 3, the cavity of the fan 3, the air outlet 32 ​​of the fan 3, and the second hot air supply channel section 62) from the air inlet 63, flows through the infusion tube heating channel 7, and then is discharged through the hot air supply channel on the air outlet side (i.e., the first hot air supply channel section 61) and the air outlet 64. Since the heating device 2 is arranged in the first hot air supply channel section 61, in the second state, even if a fault occurs and the heating device 2 cannot be powered off, it can still ensure that the infusion tube heating channel 7 is filled with relatively cold air.

[0041] In this embodiment, the fan 3 is electrically connected to the corresponding output terminal of the control circuit 5. The fan can also be directly connected to the power supply.

[0042] In this embodiment, the temperature sensor 4 can be installed in the housing or on the surface of the housing 1 (for example, it can be arranged at the bottom of a slot 12).

[0043] In this embodiment, the infusion heating device further includes a display screen 9 , which is mounted on the surface of the housing 1 . The display screen 9 is electrically connected to the corresponding output end of the control circuit 5 , and the display screen 9 can display the temperature value detected by the temperature sensor 4 .

[0044] The control circuit 5 can be a single chip microcomputer or a CPU.

[0045] refer to Figure 3 , Figure 4 and Figure 6 The infusion tube heating channel 7 is surrounded by a strip groove 71 provided on the surface of the shell 1 and two elastic sealing strips 72 provided on both sides of the top opening of the strip groove 71. The outer edges of the two elastic sealing strips 72 are respectively connected to the tops of the two side walls of the strip groove 71, and the inner edges of the two elastic sealing strips 71 are in contact with each other. In this embodiment, the strip groove 71 is curved (such as U-shaped). The elastic sealing strip 72 can be made of rubber or thermoplastic elastomer. An end opening 73 is respectively provided at both ends of the strip groove 71, and an end opening sealing portion 74 is respectively provided at both ends of the elastic sealing strip 72. A semicircular notch 75 is respectively provided on the inner edge of each end opening sealing portion 74, and the semicircular notch 75 on the end opening sealing portion 74 at the same end of the two elastic sealing strips 72 corresponds to each other. When the infusion tube 10 is loaded into the infusion tube heating channel 7, a section of the infusion tube can be placed at the junction 76 of the inner edges of the two elastic sealing strips 72 along the extension direction of the strip groove 71, and then the section of the infusion tube is pressed into the strip groove 71 (the two elastic sealing strips 72 undergo elastic deformation during the pressing process), and then the two elastic sealing strips 72 rebound, and the inner edges of the two elastic sealing strips 72 are restored to a state of contact with each other; when the infusion tube 10 needs to be taken out, the infusion tube 10 can be pulled out from the junction 76 of the inner edges of the two elastic sealing strips 72. When the infusion tube 10 is loaded into the strip groove 71, at both ends of the strip groove 71, the infusion tube 10 is in a circular hole surrounded by the semicircular notch 75 on the end opening sealing portion 74 of the same end of the two elastic sealing strips 72, and the circular hole plays a positioning role for the infusion tube 10. The radius of the semicircular notch 75 is substantially equal to the radius of the infusion tube 10. After the infusion tube 10 is inserted, the tube wall of the infusion tube can be in close contact with the inner wall of the semicircular notch 75, achieving a good seal to prevent air leakage. A vent hole 77 is respectively provided at the bottom of the groove at both ends of the strip groove 71, and the two vent holes 77 respectively constitute the air inlet end and the air outlet end of the infusion tube heating channel 7.

[0046] refer to Figure 3 and Figure 6 The housing 1 is provided with two infusion tube supports 11, which correspond to the two ends of the strip groove 71, and the infusion tube supports 11 are provided with a clamping groove 12. When the infusion tube 10 is inserted into the strip groove 71, the parts of the infusion tube 10 extending from the two ends of the strip groove 71 are respectively embedded in the clamping grooves 12 on the two infusion tube supports 11. The infusion tube supports 11 can be made of plastic.

[0047] refer to Figure 6 A plurality of protrusions 78 may be provided at the bottom of the strip groove 71. When the infusion tube 10 is installed into the strip groove 71, after the infusion tube 10 contacts the protrusions 78, the protrusions 78 may support and limit the infusion tube 10, so that a certain distance is maintained between the infusion tube 10 and the bottom of the strip groove 71.

[0048] The working principle of the infusion heating device of this embodiment is briefly described below:

[0049] When in use, a section of infusion tube 10 is placed in the infusion tube heating channel 7. Before starting the fan 3 and the heating device 2, the air flow direction is first placed in the second state. At this time, the outside air enters the hot air supply channel 6 and the infusion tube heating channel 7 through the air inlet 63 and the air outlet 64, so that the hot air supply channel 6 and the infusion tube heating channel 7 are filled with air; then the fan 3 and the heating device 2 are started, and the air flow direction switching mechanism switches the air flow direction to the first state. The fan 3 drives the air to circulate in the annular gas channel. When the air flows through the hot air supply channel 6, it is heated and heated by the heating device 2 to form hot air. When the hot air flows through the infusion tube heating channel 7, the infusion tube 10 and the liquid inside it are heated and heated. The temperature sensor 4 detects the wall temperature of the infusion tube 10 between the infusion tube heating channel 7 and the infusion needle, and transmits the temperature value to the control circuit 5. When the temperature value detected by the temperature sensor 4 is lower than or equal to the preset temperature value, the control circuit 5 sends a control signal to keep the heating device 2 powered on, and continuously heats the air flowing through the hot air supply channel 6, so that the air in the infusion tube heating channel 7 has a sufficiently high temperature, which can heat the infusion tube 10 and the liquid inside and increase its temperature. When the temperature value detected by the temperature sensor 4 is higher than the preset temperature value, the control circuit 5 sends a control signal to turn off the power of the heating device 2. At the same time, the air flow switching mechanism switches the air flow direction to the second state. At this time, the colder air from the outside enters the hot air supply channel on the air inlet side from the air inlet 63, flows through the infusion tube heating channel 7 and cools the infusion tube 10 and the liquid inside it, and then is discharged through the hot air supply channel on the air outlet side and the air outlet 64. In this state, the colder air from the outside can continuously enter the infusion tube heating channel 7 and continuously cool the infusion tube 10 and the liquid inside it.

[0050] According to the different distances from the placement of the infusion heating device to the infusion needle, the temperature preset value is set between 32-37°C (for example, 35°C) when the distance is long; the temperature preset value is set between 28-34°C (for example, 31°C) when the distance is short. In addition, the control circuit can adjust the heating power of the heating device according to the temperature value detected by the temperature sensor, for example: if the detected temperature value is low, the heating power is increased, and if the detected temperature value is high, the heating power is decreased.

[0051] In other embodiments, the fan can also be installed in the following manner: the air outlet of the hot air supply channel is connected to the air inlet of the fan, the air outlet of the fan is connected to the air inlet of the infusion tube heating channel, and the air outlet of the infusion tube heating channel is connected to the air inlet of the hot air supply channel. In this case, the air outlet of the hot air supply channel is connected to the air inlet of the infusion tube heating channel through the cavity of the fan.

[0052] In other embodiments, the installation position of the fan can also be in the following manner: the air outlet of the infusion tube heating channel is connected to the air inlet of the fan, the air outlet of the fan is connected to the air inlet of the hot air supply channel, and the air outlet of the hot air supply channel is connected to the air inlet of the infusion tube heating channel. In this case, the air outlet of the infusion tube heating channel is connected to the air inlet of the hot air supply channel through the cavity of the fan.

[0053] Example 2

[0054] like Figure 7 As shown, the main difference between this embodiment and embodiment 1 is that the air outlet end of the infusion tube heating channel 7 is not connected to the air inlet end of the hot air supply channel 6. The air inlet 31 of the fan 3 is connected to the outside, the air outlet 32 ​​of the fan 3 is connected to the air inlet end of the hot air supply channel 6, the air outlet end of the hot air supply channel 6 is connected to the air inlet end of the infusion tube heating channel 7, and the air outlet end of the infusion tube heating channel 7 is connected to the outside.

[0055] The rest of the structure of this embodiment can refer to Embodiment 1.

[0056] When the infusion heating device of this embodiment is used, a section of infusion tube 10 is placed in the infusion tube heating channel 7; after the power is turned on, driven by the fan 3, air enters the hot air supply channel 6 from the air inlet end of the hot air supply channel 6, and flows through the hot air supply channel 6 and the infusion tube heating channel 7 in sequence. When the air flows through the hot air supply channel 6, it is heated and heated by the heating device 2 to form hot air. When the hot air flows through the infusion tube heating channel 7, the infusion tube 10 and the liquid inside are heated and heated, and then the hot air is discharged from the air outlet end of the infusion tube heating channel 7. The temperature sensor 4 detects the wall temperature of the part of the infusion tube 10 between the infusion tube heating channel 7 and the infusion needle (the detection point of the temperature sensor is close to the infusion tube heating channel; the wall temperature can reflect the temperature of the liquid in the infusion tube), and transmits the temperature value to the control circuit 5. When the temperature value detected by the temperature sensor 4 is lower than or equal to the preset temperature value, the control circuit 5 sends a control signal to keep the heating device 2 powered on, and continue to heat the air flowing through the hot air supply channel 6, so that the air in the infusion tube heating channel 7 has a sufficiently high temperature, which can heat the infusion tube 10 and the liquid inside and increase its temperature. When the temperature value detected by the temperature sensor 4 is higher than the preset temperature value, the control circuit 5 sends a control signal to turn off the power of the heating device 2, and no longer heat the air flowing through the hot air supply channel 6. In this case, the air flowing through the infusion tube heating channel 7 can reduce the temperature of the infusion tube 10 and the liquid inside.

[0057] Generally, the comfortable infusion temperature for the human body is about 28-37°C. Considering the different distances from the placement of the infusion heating device to the infusion needle, the liquid cools down slightly during transportation. Therefore, the temperature preset value for a long distance can be set between 32-37°C (for example, 35°C); the temperature preset value for a short distance can be set between 28-34°C (for example, 31°C). Preferably, the control circuit can adjust the heating power of the heating device according to the temperature value detected by the temperature sensor, for example: if the detected temperature value is low, the heating power is increased, and if the detected temperature value is high, the heating power is decreased.

[0058] Example 3

[0059] refer to Figure 8The difference between this embodiment and embodiment 1 is that the structure of the air flow direction switching mechanism is different. In this embodiment, the air flow direction switching mechanism includes a two-position four-way solenoid valve 8, which is electrically connected to the corresponding output end of the control circuit; the hot air supply channel 6 is disconnected at the two-position four-way solenoid valve 8 (the hot air supply channel 6 includes a first hot air supply channel section 61 and a second hot air supply channel section 62, wherein the first hot air supply channel section 61 is disconnected at the two-position four-way solenoid valve 8, that is, the two-position four-way solenoid valve 8 is connected to the first hot air supply channel section 61; the air outlet end of the infusion tube heating channel 7 is connected to the air inlet end of the first hot air supply channel section 61 The outlet end of the first hot air supply channel section 61 is connected to the air inlet 31 of the fan 3, the outlet 32 ​​of the fan 3 is connected to the air inlet end of the second hot air supply channel section 62, and the outlet end of the second hot air supply channel section 62 is connected to the air inlet end of the infusion tube heating channel 7). The disconnection of the first hot air supply channel section 61 forms an air inlet 63 and an air outlet 64, and the air inlet 63 and the air outlet 64 are respectively connected to the corresponding passage openings on the valve body of the two-position four-way solenoid valve 8, and the remaining two passage openings on the valve body of the two-position four-way solenoid valve 8 are connected to the outside. The air flow switching mechanism switches between the following two states: in the first state (such as Figure 8 In the state shown), the air inlet 63 and the air outlet 64 are connected through the valve core of the two-position four-way solenoid valve 8, and the hot air supply channel 6 is connected; in the second state, the two-position four-way solenoid valve 8 switches the valve core position under the control of the control circuit, and the valve core of the two-position four-way solenoid valve 8 connects the air inlet 63 with the outside world (to introduce outside air), and at the same time connects the air outlet 64 with the outside world (to discharge the air flowing through the heating channel of the infusion tube to the outside world).

[0060] The rest of the structure of this embodiment can refer to Embodiment 1.

Claims

1. An infusion heating device, characterized in that It includes a housing, a heating device, a fan, a temperature sensor and a control circuit. The housing is provided with a hot air supply channel and a liquid infusion tube heating channel. The air outlet of the hot air supply channel is connected with the air inlet of the liquid infusion tube heating channel. The fan is installed on the hot air supply channel. The heating device is arranged in the hot air supply channel. The temperature sensor is electrically connected to the corresponding input end of the control circuit. The heating device is electrically connected to the corresponding output end of the control circuit. The air outlet end of the heating channel of the liquid infusion tube is connected to the air inlet end of the hot air supply channel; The hot air supply channel is provided with an air inlet and an air outlet, the air inlet, the fan, the infusion tube heating channel, and the air outlet are arranged in sequence along the air flow direction, and the hot air supply channel is provided with an air flow direction switching mechanism for switching the air flow direction in the hot air supply channel; The air flow direction switching mechanism can switch the air flow direction in the hot air supply channel between the following two states: in the first state, the air inlet and the air outlet are both closed, the hot air supply channel is connected, and the air can circulate in the annular gas channel composed of the infusion tube heating channel and the hot air supply channel; in the second state, the air inlet and the air outlet are both open, the hot air supply channel is partially separated between the air inlet and the air outlet, and the outside air enters the hot air supply channel on the air inlet side from the air inlet, flows through the infusion tube heating channel, and is discharged through the hot air supply channel on the air outlet side and the air outlet.

2. The infusion heating device according to claim 1, characterized in that: The fan is electrically connected to the corresponding output end of the control circuit; the temperature sensor is installed in the heating channel of the infusion tube.

3. The infusion heating device according to claim 1, characterized in that: The fan is electrically connected to the corresponding output end of the control circuit; the temperature sensor is installed in the shell or on the surface of the shell.

4. The infusion heating device according to claim 1, characterized in that: The infusion heating device also includes a display screen, which is mounted on the surface of the shell and is electrically connected to the corresponding output terminal of the control circuit.

5. The infusion heating device according to claim 1, characterized in that: The infusion tube heating channel is surrounded by a strip groove arranged on the surface of the outer shell and two elastic sealing strips arranged on both sides of the top opening of the strip groove. The outer edges of the two elastic sealing strips are respectively connected to the tops of the two side walls of the strip groove, and the inner edges of the two elastic sealing strips are in contact with each other.

6. The infusion heating device according to claim 5, characterized in that: The strip-shaped groove is in a straight line or a curve shape; the elastic sealing strip is made of rubber or thermoplastic elastomer.

7. The infusion heating device according to claim 5, characterized in that: An end opening is respectively provided at both ends of the strip-shaped groove, and an end opening sealing portion is respectively provided at both ends of the elastic sealing strip. A semicircular notch is respectively provided on the inner edge of each end opening sealing portion, and the positions of the semicircular notches on the end opening sealing portions at the same end of the two elastic sealing strips correspond to each other.

8. The infusion heating device according to claim 5, characterized in that: The shell is provided with two infusion tube supports, which correspond to the two end positions of the strip groove respectively, and the infusion tube supports are provided with a card slot.

9. The infusion heating device according to claim 1, characterized in that: The air flow direction switching mechanism includes a driving motor, an air inlet baffle, an air outlet baffle and a baffle shaft. The air inlet and the air outlet are arranged on the side walls of the hot air supply channel and are arranged side by side front and back. The baffle shaft can be rotatably mounted on the outer shell and is located between the air inlet and the air outlet. The driving motor is mounted on the outer shell. The power output shaft of the driving motor is transmission-connected to the baffle shaft. The driving motor is electrically connected to the corresponding output end of the control circuit.

10. The infusion heating device according to claim 1, characterized in that: The air flow direction switching mechanism includes a two-position four-way solenoid valve, which is electrically connected to the corresponding output end of the control circuit; the hot air supply channel is disconnected at the two-position four-way solenoid valve, and the air inlet and the air outlet are formed at the disconnection point, and the air inlet and the air outlet are respectively connected to the corresponding passage openings on the valve body of the two-position four-way solenoid valve, and the other two passage openings on the valve body of the two-position four-way solenoid valve are connected to the outside.

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