Portable blood transfusion heating device

By using a lightweight aluminum alloy heat-conducting plate and insulation layer in a portable blood transfusion device, combined with battery power and a temperature sensor, the problems of low space utilization, low thermal conductivity, and poor heat preservation in portable blood transfusion heating devices have been solved, achieving a more efficient blood transfusion heating process.

CN223731877UActive Publication Date: 2025-12-30ACADEMY OF MILITARY MEDICAL SCIENCES
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Patent Information

Application Number
CN202520239150.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-14
Publication Date
2025-12-30
Estimated Expiration
2035-02-14

AI Technical Summary

Technical Problem

Existing portable blood transfusion warming devices suffer from problems such as low internal space utilization, low heat conduction efficiency, and poor heat preservation effect.

Method used

A portable blood transfusion warming device was designed, which uses a lightweight aluminum alloy heat-conducting plate to cover the opening of the receiving cavity, and is equipped with heat-conducting grooves and heating plates. Combined with battery power supply, it is equipped with an insulation layer, temperature sensor, and overheat protector, which improves space utilization and heat conduction efficiency, and enhances the heat preservation effect.

Benefits of technology

The ratio of the relative area between the heat-conducting plate and the opening of the box is increased, the heating distance of the transfusion tube is extended, the heat conduction efficiency is improved, the heat preservation effect is enhanced, and the safety and efficiency of the blood transfusion process are ensured.

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Abstract

The utility model relates to the technical field of medical equipment, and provides a portable blood transfusion heating device, which comprises a box body, a heating device and a heating device, the side plate is arranged around the periphery of the bottom plate to form an accommodating cavity with an opening in one side; the main control board is arranged on a side plate in the accommodating cavity; the heat conducting plate covers the opening of the accommodating cavity; one side surface, far away from the bottom plate, of the heat-conducting plate is provided with a heat-conducting groove for placing blood transfusion tubes; a heating piece is arranged on the surface of the side, close to the bottom plate, of the heat conduction plate and electrically connected with the main control board. And one side of the cover body is hinged to one side of the opening of the accommodating cavity and covers the heat conduction groove. According to the utility model, the relative area ratio of the heat-conducting plate to the opening of the box body is increased to the greatest extent, and the space utilization rate in the box body is increased; the blood transfusion tube can be heated more sufficiently, and higher heat conduction efficiency is achieved; the heat preservation layer is arranged on the inner side face of the cover body, completely covers the heat conduction plate and is tightly attached to the heat conduction plate, and the better heat preservation effect is achieved.
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Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, relates to a portable blood transfusion heating device. BACKGROUND

[0002] Blood transfusion is a kind of treatment method that blood is transfused to patient through vein, and is widely used in clinic, and blood transfusion is the principle of transfusing the same type blood.In clinical blood transfusion, blood transfusion tube is essential tool, however, standby blood needs low-temperature storage, and due to the temperature of blood being too low, far below human body temperature, if low-temperature blood is input into human body, light causes blood vessel contraction, heavy causes human body discomfort and thus produces adverse reaction, therefore, blood can be heated to be input into human body, at this time, heating device is needed to heat blood transfusion bag or blood transfusion tube.

[0003] Fixed blood transfusion heating device is generally used in hospital, and the device is generally large in size and large in floor space, and the device is only suitable for indoor fixed place, poor in portability, and not suitable for use in outdoor or field environment.For this, the prior art provides portable blood transfusion heating device, and main components are concentrated in a small box, power supply of heating device is realized by using battery, and heating plate and other heating components are provided to heat blood transfusion tube.However, the improvement of the prior art still has problems of insufficient space utilization in box, low heat conduction efficiency and poor heat preservation effect, and improvement is urgently needed. UTILITARIAN CONTENT

[0004] The utility model provides a portable blood transfusion heating device to solve the technical problems of low space utilization, low heat conduction efficiency and poor heat preservation effect of blood transfusion tube heating device in prior art.

[0005] The utility model provides a portable blood transfusion heating device, which comprises:

[0006] The box body comprises a side plate and a bottom plate, and the side plate is arranged around the outer periphery of the bottom plate to form a one-side open containing cavity;

[0007] The main control board is arranged on the side plate or the bottom plate;

[0008] The heat conduction plate covers the opening of the containing cavity,

[0009] The side surface of the heat conduction plate away from the bottom plate is provided with a heat conduction groove for placing the blood transfusion tube,

[0010] The side surface of the heat conduction plate close to the bottom plate is provided with a heating sheet, and the heating sheet is electrically connected with the main control board;

[0011] The cover body is hingedly connected to one side of the opening of the containing cavity, and covers the heat conduction groove.

[0012] The utility model provides a portable blood transfusion temperature raising device, comprising:

[0013] The battery is arranged on the bottom plate in the accommodating cavity and is electrically connected with the main control board.

[0014] The utility model provides a portable blood transfusion temperature raising device, comprising: support frame, the support frame is arranged in the circumference along the open inner edge of accommodating cavity;

[0015] The heat conduction plate is clamped on the side of the support frame away from the open inner edge of the accommodating cavity.

[0016] The utility model provides a portable blood transfusion temperature raising device, comprising: heat preservation layer, the heat preservation layer is arranged on the side surface of the cover body covering the heat conduction groove.

[0017] According to the utility model provides a kind of portable blood transfusion temperature raising device, the side wall of the heat conduction plate same side or opposite side is provided with inlet and outlet, and the inlet and the outlet are respectively communicated with the end of the heat conduction groove, for the import and export of the blood transfusion tube;

[0018] Wherein, at least one inflection point is arranged on the heat conduction groove.

[0019] The utility model provides a kind of portable blood transfusion temperature raising device, comprising: first temperature sensor, the first temperature sensor is arranged in the heat conduction groove, for monitoring the temperature in the heat conduction groove.

[0020] The utility model provides a kind of portable blood transfusion temperature raising device, comprising: second temperature sensor, the second temperature sensor is arranged in the accommodating cavity, for monitoring the temperature of the internal closed space of the accommodating cavity.

[0021] The utility model provides a kind of portable blood transfusion temperature raising device, comprising: overheat protector, the overheat protector is connected between the heating sheet and the main control board, for heating sheet overheat when disconnecting circuit.

[0022] The utility model provides a kind of portable blood transfusion temperature raising device, further comprising: display screen, the display screen is arranged in support frame, and with the main control board electric connection;

[0023] Wherein, the cover body is provided with transparent window in the position corresponding to the display screen.

[0024] The utility model provides a kind of portable blood transfusion temperature raising device, the outside of the box body is provided with first power button and second power button;

[0025] The first power button and the second power button are electrically connected with the main control board.

[0026] The temperature of the heat-conducting plate corresponding to the first power button is higher than the temperature of the heat-conducting plate corresponding to the second power button.

[0027] The utility model discloses a heat-conducting plate covers the open of containing cavity, the relative area ratio of heat-conducting plate and the open of box body is improved to the maximum extent, and the space utilization of the box body is improved, the distance of the blood transfusion tube in the heat-conducting groove is longer when the area of heat-conducting plate is improved, can more fully heat the blood transfusion tube, has higher heat-conducting efficiency, sets up the heat preservation layer on the inboard of lid body, and the heat preservation layer covers the heat-conducting plate completely and fits closely, has better heat preservation effect. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the utility model or the prior art, the following will be a simple introduction to the drawings needed to be used in the embodiment or the prior art description, and obviously, the following description of the drawings is some embodiments of the utility model, and for those skilled in the art, under the premise of not creating labor, other drawings can also be obtained according to these drawings.

[0029] Figure 1 It is the perspective exploded view provided by the utility model;

[0030] Figure 2 It is the plan view when the lid body is opened, which is provided by the utility model;

[0031] Figure 3 It is the circuit connection schematic diagram provided by the utility model.

[0032] Reference signs:

[0033] 1, box body; 101, side plate; 102, bottom plate; 103, containing cavity;

[0034] 2, main control board; 3, heat-conducting plate; 301, heat-conducting groove; 4, heating sheet; 5, lid body; 6, battery; 7, support frame; 8, heat preservation layer; 9, first temperature sensor; 10, second temperature sensor; 11, overheat protector; 12, display screen; 13, transparent window; 14, first power button; 15, second power button; 16, charging port; 17, switch. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the utility model clearer, the technical scheme of the utility model will be described clearly and completely in combination with the drawings in the utility model below. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0036] The utility model provides a portable blood transfusion heating device. Figures 1-3 The utility model discloses a portable blood transfusion heating device.

[0037] Figure 1 The utility model provides a three-dimensional exploded view, Figure 2 The utility model provides a three-dimensional exploded view, Figure 1 And Figure 2 The utility model provides a portable blood transfusion heating device, which comprises a box body 1, a side plate 101 and a bottom plate 102, the side plate 101 is arranged around the outer periphery of the bottom plate 102 to form a containing cavity 103 with one side open, specifically, in an embodiment of the utility model, the box body 1 is a rectangular shell with the upward opening, comprising four side plates 101 and one bottom plate 102.

[0038] A main control board 2 is arranged on the side plate 101 or the bottom plate 102 in the containing cavity 103, specifically, the side plate 101 is provided with a mounting seat, and the main control board 2 is fixed on the mounting seat.

[0039] A heat conduction plate 3 covers the opening of the containing cavity 103, and the heat conduction plate 3 is preferably made of light aluminum alloy material by comprehensively considering the heat conductivity coefficient and the material density, one side surface of the heat conduction plate 3 away from the bottom plate 102 is provided with a heat conduction groove 301 for placing a blood transfusion tube, and one side surface of the heat conduction plate 3 close to the bottom plate 102 is provided with a heating sheet 4, the heating sheet 4 is electrically connected with the main control board 2, specifically, the power of the heating sheet 4 needs to be calculated according to the maximum flow rate and temperature difference of the liquid combined with the specific heat, the maximum power of the heating sheet 4 is determined as 40-60W by considering the heat dissipation flow type and the voltage reduction during the discharge of the battery, and the size and resistance parameters of the heating sheet 4 are drawn by using relevant software, and the heating sheet 4 meeting the requirements is customized.

[0040] A cover 5 is hingedly connected to one side of the opening of the containing cavity 103 and covers the heat conduction groove 301, specifically, buckles are arranged on the cover 5 and the box body 1, which are used for buckling and fixing the cover 5 and the box body 1, guaranteeing the tightness of the cover 5, and preventing the cover 5 from being abnormally opened.

[0041] As shown in Figure 1As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved.

[0042] As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved. Figure 1 Figure 2 As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved.

[0043] As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved. Figure 2 As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved.

[0044] Figure 1 As shown in the portable blood transfusion heating device provided by the embodiment of the utility model, the battery 6 can adopt lithium battery, and 6 serial 2 parallel battery packs can be selected, the single battery is 18650 power battery, and the battery 6 is provided with charge and discharge protection and balance, so that the capacity and charging speed are met; the battery 6 is arranged on the bottom plate 102 in the accommodating cavity 103 and is electrically connected with the main control board 2, and the battery 6 can also be externally hung on the outer side of the box body 1; the purpose of placing the battery 6 on the bottom plate 102 in the accommodating cavity 103 or external hanging is to leave space for the heat conduction plate 3, so that the heat conduction plate 3 covers the opening of the accommodating cavity 103, the space utilization rate of the inside of the box body 1 is improved, and the area ratio of the heat conduction plate 3 is improved, and the heat conduction efficiency is improved. Figure 2

[0045] Wherein, at least one inflection point is arranged on the heat conduction groove 301.

[0046] ​​​It should be understood that for the fixed area heat conduction plate 3, the more the inflection points of the heat conduction groove 301 are, the longer the length of the blood transfusion tube in the heat conduction groove 301 is, but the number of inflection points or bends is not the more the better, and the total length of the blood transfusion tube needs to be considered comprehensively, combined with the ambient temperature and the cost of opening the heat conduction groove 301, and the most suitable heat conduction groove 301 path and length are preferred.

[0047] Figure 3 The utility model provides a circuit connection schematic diagram, as Figure 3 Indicated, according to the portable blood transfusion heating device provided in the utility model embodiment, first temperature sensor 9 is arranged in heat conduction groove 301, and is used for monitoring the temperature in heat conduction groove 301.

[0048] According to the portable blood transfusion heating device provided in the utility model embodiment, second temperature sensor 10 is arranged in containing cavity 103, and is used for monitoring the temperature of the internal closed space of containing cavity 103.

[0049] Further, in an embodiment of the utility model, first temperature sensor 9 and second temperature sensor 10 can all use lead NTC thermistor as temperature feedback, and have the functions of splash-proof and dust-proof.

[0050] As Figure 3 Indicated, according to the portable blood transfusion heating device provided in the utility model embodiment, overheat protector 11 is connected between heating sheet 4 and main control board 2, and is used for disconnecting the circuit when heating sheet 4 is overheated.

[0051] Further, in an embodiment of the utility model, overheat protector 11 can select normally closed type, rated overcurrent capacity 10A, and is connected in the circuit of heating sheet 4 and main control board 2, and is automatically disconnected when the temperature is higher than threshold value; in addition, overheat protector has self-recovery function, and can recover to normal by closing main switch 17 and placing in cool place for a period of time.

[0052] As Figure 2 Indicated, according to the portable blood transfusion heating device provided in the utility model embodiment, still include display screen 12, display screen 12 can use OLED material, display screen 12 is arranged in support frame 7, the surface of display screen 12 is provided with protective cover, and is electrically connected with main control board 2;Cover 5 is provided with transparent window 13 corresponding to the position of display screen 12, and the parameters of display screen 12 can be observed through transparent window 13;Wherein, display screen 12 can display the real-time temperature of heat conduction groove 301, the real-time temperature of the internal space of containing cavity 103, power mode, power and the like.

[0053] As Figure 1 And Figure 3As shown, according to the portable blood transfusion heating device provided by the utility model embodiment, the outer side of the box body 1 is provided with a first power button 14 and a second power button 15; the first power button 14 and the second power button 15 are electrically connected with the main control board 2; wherein the temperature of the corresponding heat conduction plate 3 when the first power button 14 is turned on is higher than the temperature of the corresponding heat conduction plate 3 when the second power button 15 is turned on.

[0054] Further, the positions of the first power button 14 and the second power button 15 correspond to the position of the main control board 2, the rated current-carrying capacity of the button and the switch 17 is not less than 5A, and the withstand voltage is higher than 30V; the side of the box body 1 is further provided with a charging port 16, the charging port 16 corresponds to the setting position of the storage battery 6, the charging port 16 is fixed with a gasket, the port has a rubber plug, liquid or sundries are prevented from entering, the switch 17 is arranged beside the charging port 16, and the outer side cover of the switch 17 is provided with a waterproof cap.

[0055] Further, the device provided by the utility model embodiment can be inspected before use, and the inspection steps are as follows: a standard blood bag and a blood transfusion tube are used, sufficient liquid and blood are filled, the specific heat is close, the blood bag is hung at room temperature 25 degrees Celsius, the blood transfusion tube is attached along the heat conduction groove 301, the cover body 5 is closed, the liquid flow rate is adjusted, the first power button 14 is pressed, the high gear is selected, meanwhile, the outlet of the blood transfusion tube is arranged at the cup opening of a large beaker, the temperature inspection instrument probe and the outlet liquid are in good contact, when the temperature is stable, the temperature is observed and recorded, the observation is continued until the liquid is consumed, and the fluctuation range of the temperature is observed.

[0056] Further, when the device provided by the utility model embodiment is used: the blood transfusion tube is attached along the heat conduction groove 301, the blood transfusion tube is prevented from being twisted, inclined or protruded, the cover body 5 is closed after the blood transfusion tube is placed stably, buckles are prevented from being abnormally opened, so that the buckles can be used for subsequent operation after the buckles are matched; the switch 17 is opened, the second power selection button is pressed, the display screen 12 left side displays "weak", the real-time temperature in the central part of the screen is observed, and blood transfusion can be started when the temperature approaches 38 degrees Celsius; if the environmental temperature is low or the distance between the blood transfusion needle and the pipeline of the heating device is long, the first power button 14 is pressed, and the display screen 12 left side displays "strong"; in addition, when the device is used, if the temperature of the heat conduction plate 3 is too high or the temperature of the internal space of the containing cavity 103 is too high, the overheat protector 11 disconnects the electrical connection of the heating sheet 4, and the display screen 12 prompts high-temperature alarm; if the high-temperature alarm occurs, the switch 17 needs to be turned off and placed in a cool place for a period of time, and then the device can be used again. After the device is used, the switch 17 is turned off, the blood transfusion tube is taken out, and the device is placed in a place without high temperature and heat source; if the power displayed in the form of percentage in the upper right corner is too low during use, the device needs to be charged in time after use.

[0057] The device embodiments described above are merely illustrative, wherein the units illustrated as separate components can or can not be physically separate, and the components illustrated as units can or can not be physical units, i.e., can be located in one place, or can be distributed to multiple network units. Part or all of the modules can be selected to achieve the purposes of the embodiments according to actual needs. Those skilled in the art can understand and implement without creative labor.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A portable blood transfusion warming device, characterized by, The application relates to a blood transfusion device, which comprises the following parts: a box body (1) comprising a side plate (101) and a bottom plate (102); the side plate (101) is arranged around the outer periphery of the bottom plate (102) to form a side-opened containing cavity (103); a main control board (2) arranged on the side plate (101) or the bottom plate (102); a heat-conducting plate (3) covering the opening of the containing cavity (103); a heat-conducting groove (301) for placing a blood transfusion tube is arranged on the side surface of the heat-conducting plate (3) away from the bottom plate (102); a heating sheet (4) is arranged on the side surface of the heat-conducting plate (3) close to the bottom plate (102); the heating sheet (4) is electrically connected with the main control board (2); a cover body (5) hinged on one side of the opening of the containing cavity (103) and covering the heat-conducting groove (301).

2. The portable blood warming device of claim 1, wherein, The application further comprises the following parts: a storage battery (6) arranged on the bottom plate (102) in the containing cavity (103) and electrically connected with the main control board (2).

3. The portable blood warming device of claim 2, wherein, The application further comprises the following parts: a support frame (7) arranged along the inner edge of the opening of the containing cavity (103) in a circumferential direction; the heat-conducting plate (3) is clamped on the side of the support frame (7) away from the inner edge of the opening of the containing cavity (103).

4. The portable blood warming device of claim 3, wherein, The application further comprises the following parts: a heat-insulating layer (8) arranged on the side surface of the cover body (5) covering the heat-conducting groove (301).

5. The portable blood warming device according to any one of claims 1 to 4, characterized in that the side wall of the heat-conducting plate (3) is provided with a guide inlet and a guide outlet which are respectively communicated with the end of the heat-conducting groove (301) for guiding the blood transfusion tube to enter and exit; wherein at least one inflection point is arranged on the heat-conducting groove (301).

6. The portable blood warming device of claim 5, wherein, The application further comprises the following parts: a first temperature sensor (9) arranged in the heat-conducting groove (301) for monitoring the temperature in the heat-conducting groove (301).

7. The portable blood warming device of claim 5, wherein, The application further comprises the following parts: a second temperature sensor (10) arranged in the containing cavity (103) for monitoring the temperature of the enclosed space in the containing cavity (103).

8. The portable blood warming device of claim 7, wherein, The application further comprises the following parts: an overheat protector (11) connected between the heating sheet (4) and the main control board (2) for disconnecting the circuit when the heating sheet (4) is overheated.

9. The portable blood warming device of claim 8, wherein, The application further comprises the following parts: a display screen (12) arranged on the support frame (7) and electrically connected with the main control board (2); wherein the cover body (5) is provided with a transparent window (13) corresponding to the position of the display screen (12).

10. The portable blood warming device of claim 9, wherein, the outer side surface of the box body (1) is provided with a first power button (14) and a second power button (15); the first power button (14) and the second power button (15) are both electrically connected with the main control board (2); wherein the temperature of the heat-conducting plate (3) corresponding to the first power button (14) when the first power button (14) is turned on is higher than the temperature of the heat-conducting plate (3) corresponding to the second power button (15) when the second power button (15) is turned on.