Conductive gel of electrocardiograph and using device of conductive gel

Abstract

The invention discloses conductive gel of an electrocardiograph and a using device of the conductive gel, the conductive gel comprises the following components in parts by weight: 5-8 parts of a conductive medium, 25-35 parts of a hydrogel monomer, 2-3 parts of a cross-linking agent, 70-100 parts of deionized water, 1-2 parts of an electrolyte, 1-2 parts of a humectant and 10-20 parts of modified nano diatomite, and the specific surface area of the modified diatomite is greater than 240 m < 2 > / g; the using device comprises a cuboid-shaped shell, an inverted-L-shaped partition plate is arranged in the shell, an electric control bin is formed on the outer side of the partition plate, a gel bin is formed on the inner side of the partition plate, a motor and a control mechanism connected with the motor are arranged in the electric control bin, the motor is located at the top of the gel bin, a piston is arranged in the gel bin, and a screw connected with the output end of the motor is arranged in the axial direction of the piston. And the bottom of the gel bin is rotationally connected with an extrusion head. The device has the advantages of being long in replacement period, convenient to use and good in smearing effect.

Description

Technical Field

[0001] The present invention belongs to the field of electrocardiogram monitoring, and particularly relates to a conductive gel for an electrocardiograph and a device for using the conductive gel. Background Art

[0002] In the medical system, an electrocardiograph is generally used for electrocardiogram monitoring, and the electrode pads of the electrocardiograph are placed on the corresponding skin positions of the patient. In the actual operation process, to ensure the signal transmission quality and improve the electrocardiogram monitoring accuracy, it is necessary to reduce the contact impedance between the skin and the electrode pads. This requires pre-coating the skin where the electrode pads are placed with a conductive gel (also known as conductive paste), and then fixing the electrode pads to the skin.

[0003] Existing conductive gels, such as the medical conductive paste with IPC classification number: A61K50 / 00 and application number 202211009455.0, include nano-conductive materials, moisturizers, phosphate buffer solutions, thickeners, surfactants, disinfection components, and gel components.

[0004] Although existing conductive gels can reduce the contact impedance between the skin and the electrode pads, there are still some problems in the use process. The main problem is that hospitals cannot use different types of conductive pastes according to the conditions of each patient. For some patients with dry skin, the moisture in the conductive gel is absorbed by the skin and diffuses and evaporates outward along the skin, causing the conductive gel to dry out quickly, and the skin returns to a dry state, thereby changing the conductivity and reducing the signal transmission quality.

[0005] Currently, in order to ensure the electrocardiogram monitoring quality of the vast majority of patients, usually the method of increasing the replacement frequency of the conductive gel is adopted, but this increases the medical cost and the workload of medical staff.

[0006] In addition, existing conductive gels are filled in extrusion bottles made of plastic materials. When in use, medical staff extrude a part of the conductive gel onto the skin and smear it evenly with tools such as cotton swabs. However, it is difficult to keep the extrusion amount fixed each time. Sometimes, too much is extruded, exceeding the coverage area of the electrode pads, causing unnecessary waste and increasing the possibility of skin allergy. Sometimes, too little is extruded, and it is necessary to extrude again. Moreover, the area size formed by each smear is different, with poor consistency, and it is relatively troublesome to use. Summary of the Invention

[0007] The purpose of the present invention is to provide a conductive gel for an electrocardiograph and a device for using the conductive gel. The present invention has the advantages of a long replacement cycle, convenient use, and good smearing effect.

[0008] Technical solution of the present invention: A conductive gel for an electrocardiograph, by weight, comprises 5-8 parts of a conductive medium, 25-35 parts of a hydrogel monomer, 2-3 parts of a crosslinking agent, 70-100 parts of deionized water, 1-2 parts of an electrolyte, 1-2 parts of a humectant, and 10-20 parts of modified nano-diatomite, and the specific surface area of the improved diatomite is greater than 240 m² / g.

[0009] In the conductive gel for the electrocardiograph described above, there are 6.5 parts of the conductive medium, 30 parts of the hydrogel monomer, 2.5 parts of the crosslinking agent, 80 parts of deionized water, 1.5 parts of the electrolyte, 1.5 parts of the humectant, and 15 parts of the modified nano-diatomite.

[0010] In the conductive gel for the electrocardiograph described above, the conductive medium is carbon nanotube powder, the hydrogel monomer is hydroxyalkyl methacrylate, acrylamide derivative, hydroxyethyl methacrylate, polyethylene glycol diacrylate or sodium polyacrylate, the electrolyte is sodium chloride or potassium chloride, and the humectant is glycerol.

[0011] In the conductive gel for the electrocardiograph described above, the production process of the modified nano-diatomite includes the following steps.

[0012] 1), Obtain diatomite raw material, grind the diatomite raw material into powder to obtain a first intermediate.

[0013] 2), Immerse the first intermediate into a nitric acid solution with a concentration of 20%-30%, let it stand for 2-3 hours, wash and dry to obtain a second intermediate.

[0014] 3), Immerse the second intermediate into a sodium hydroxide solution with a concentration of 5%-10% and a temperature of 120-200°C, let it stand for 10-15 hours, wash and dry to obtain a third intermediate.

[0015] 4), Immerse the third intermediate into a titanyl sulfate solution with a pH value less than 4, stir evenly, then adjust the pH of the titanyl sulfate solution to 7-8.5, and heat to a slightly boiling state, keep it for 6-8 hours, filter, wash and dry to obtain a fourth intermediate.

[0016] 5), Heat the fourth intermediate to 550-650°C, keep it for 10-15 hours to obtain a fifth intermediate.

[0017] 6), Grind the fifth intermediate to obtain the modified nano-diatomite.

[0018] In the conductive gel for the electrocardiograph described above, in step 2), the concentration of the nitric acid solution is 24.5% and the standing time is 2.5 hours.

[0019] In the conductive gel for the electrocardiograph described above, in step 3), the concentration of the sodium hydroxide solution is 8%, the temperature is 180°C, and the standing time is 12 hours.

[0020] In the conductive gel of the aforementioned electrocardiograph, in step 5), the fourth intermediate is heated to 610 ± 5 °C.

[0021] The device for using the aforementioned conductive gel includes a cuboid-shaped outer shell. Inside the outer shell, there is an inverted "L"-shaped partition. The outer side of the partition forms an electric control chamber, and the inner side of the partition forms a gel chamber. Inside the electric control chamber, there is a motor and a control mechanism connected to the motor. The motor is located at the top of the gel chamber. Inside the gel chamber, there is a piston. An axial screw rod connected to the output end of the motor is provided on the piston. The bottom of the gel chamber is rotatably connected to an extrusion head.

[0022] In the device for using the aforementioned conductive gel, a smearing head is provided at the lower end of the extrusion head. The smearing head communicates with the gel chamber through the extrusion head. The extrusion head is a tubular structure. The upper end of the extrusion head is located inside the gel chamber, and the lower end of the extrusion head is located below the gel chamber. A feed port is provided on the side wall of the extrusion head. The feed port connects the gel chamber and the inner hole of the extrusion head. The upper end of the extrusion head is connected to the screw rod through an acceleration mechanism.

[0023] In the device for using the aforementioned conductive gel, the acceleration mechanism includes an internal gear ring and a bracket. The internal gear ring is fixed inside the gel chamber. A first gear connected to the extrusion head is provided inside the internal gear ring. At least three second gears evenly distributed circumferentially are provided between the first gear and the internal gear ring. The second gears are rotatably connected to the bracket;

[0024] The smearing head is in the shape of a round plate. The top of the smearing head is screwed to the extrusion head. A flat buffer cavity is provided inside the smearing head. The buffer cavity communicates with the inner hole of the extrusion head. A flat groove is provided on the bottom surface of the smearing head. The depth of the groove is 0.2 - 0.5 mm. A plurality of extrusion holes are provided between the groove and the buffer cavity.

[0025] Compared with the prior art, the conductive gel of the present invention contains a certain proportion of modified nano-diatomaceous earth, enabling the conductive gel to have a certain humidity adjustment ability. In the initial state, the modified nano-diatomaceous earth adsorbs a large amount of water molecules. After being smeared on the skin, if the skin is not dry, the water molecules in the modified nano-diatomaceous earth are not easily released, avoiding allergies caused by excessive skin moisture. If the skin is dry, the water molecules in the modified nano-diatomaceous earth are slowly released, maintaining a certain humidity between the conductive gel and the skin, making the conductivity meet the standard, and keeping the monitoring signal transmission quality within the qualified range. Thus, the replacement cycle of the conductive gel is extended, and the medical cost and the workload of medical staff are reduced.

[0026] The present invention also provides a device for using a conductive gel. This device for use can output the conductive gel quantitatively, neither more nor less, and can complete the rapid replenishment of the conductive gel. It is convenient to use. While the conductive gel is being output, it can also complete the automatic smearing of the conductive gel on the skin, replacing manual smearing, with a good smearing effect, and further improving the convenience of use.

[0027] In summary, the present invention has the advantages of long replacement cycle, convenient use and good smearing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a micrograph of modified nano-diatomite.

[0029] Figure 2 It is a front view schematic diagram of the using device in Example 3.

[0030] Figure 3 It is a front view schematic diagram of the acceleration mechanism.

[0031] Figure 4 It is a top view schematic diagram of the acceleration mechanism.

[0032] Figure 5 It is a front view schematic diagram of the smearing head.

[0033] Figure 6 It is a schematic diagram of the control mechanism.

[0034] Figure 7 It is a physical diagram of the using device in Example 4.

[0035] The labels in the drawings are: 1 - outer shell, 2 - partition board, 3 - electronic control bin, 4 - gel bin, 5 - motor, 7 - piston, 8 - screw rod, 9 - extrusion head, 10 - smearing head, 11 - feed inlet, 12 - acceleration mechanism, 13 - internal gear ring, 14 - bracket, 15 - first gear, 16 - second gear, 17 - buffer cavity, 18 - groove, 19 - extrusion hole, 20 - extrusion button, 21 - material extraction button, 22 - controller, 23 - storage battery, 24 - charging interface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] The present invention will be further described below in conjunction with the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0037] Example 1: The production process of modified nano-diatomite includes the following steps

[0038] 1), Obtain diatomite raw materials, grind the diatomite raw materials into powder with 100 mesh or finer to obtain a first intermediate product.

[0039] 2), Immerse the first intermediate product in a nitric acid solution with a concentration of 20% - 30%, stand for 2 - 3 hours, wash and dry to obtain a second intermediate product.

[0040] The first intermediate product contains impurities that can react with acid solutions, such as aluminum oxide, iron oxide, magnesium oxide, etc. Nitric acid belongs to strong acid, which can react with these impurities to form soluble salts, expand the pore channels of diatomite, thereby increasing the porosity and the specific surface area of diatomite.

[0041] In some comparative experiments, nitric acid was replaced with hydrochloric acid and sulfuric acid. However, due to its low oxidizing property, hydrochloric acid has a poor purification effect on diatomite, and the specific surface area of the obtained diatomite will be lower. Moreover, when using sulfuric acid and hydrochloric acid to treat diatomite, higher temperatures and longer reaction times are required to complete the reaction, which is not conducive to reducing the preparation cycle. In addition, when using nitric acid to treat diatomite, an oxide film can also be formed on the diatomite, further expanding the specific surface area of the diatomite.

[0042] When determining the nitric acid concentration parameter, multiple comparative experiments were carried out. It was observed under a microscope that when the concentration of the nitric acid solution is low, the impurity removal effect is poor, and the pore structure of the diatomite cannot be well improved. While when the concentration of the nitric acid solution is high, although the impurity removal effect is good, it will also cause the dissolution of the pore walls of some micropores in the diatomite, resulting in over-etching and instead reducing the specific surface area of the diatomite. When determining the nitric acid treatment time, that is, the standing time, similarly, a short time leads to a poor impurity removal effect, and a long time also causes the dissolution of the diatomite pore walls. After repeated attempts, it was determined that a nitric acid solution concentration of 20%-30% and a standing time of 2-3 hours are more appropriate, and the best is a nitric acid concentration of 24.5% and a standing time of 2.5 hours.

[0043] 3) Soak the second intermediate in a sodium hydroxide solution with a concentration of 8% and a temperature of 120-200 °C (to make the temperature of the sodium hydroxide solution reach the standard, the sodium hydroxide solution is heated in a pressure vessel), stand for 10-15 hours, wash and dry to obtain the third intermediate;

[0044] After the second intermediate is treated with acid solution, some impurities that can react with the alkali solution are still retained. Therefore, it is necessary to carry out alkali solution treatment. In a high-pressure and high-temperature environment, the pore channels of the diatomite are further enlarged, and the pore structure is optimized. The sodium hydroxide solution can also be replaced with a potassium hydroxide solution, and the obtained effect is similar, but the cost of potassium hydroxide is higher and it is more difficult to obtain. It was found in some comparative experiments that when the heating temperature is low and the time is short, the promotion effect on the opening of the pore channels is reduced. However, when the heating temperature is high and the time is long, tobermorite in the diatomite will be transformed into xonotlite, resulting in a reduction in the strength of the diatomite pore walls, and collapse may occur during subsequent treatment, leading to a reduction in the specific surface area. The optimal choice is a combination of a temperature of 180 °C and a standing time of 12 hours. At this time, the pore channel opening effect is good, and no xonotlite is generated.

[0045] 4) Soak the third intermediate in a saturated solution of titanium oxysulfate with a pH value less than 4, and store the saturated solution of titanium oxysulfate at a low temperature (2 - 5 °C). Since the pH of the titanium oxysulfate solution is less than 4 and it is stored at a low temperature, titanium oxysulfate does not undergo hydrolysis reaction, avoiding the formation of metatitanic acid precipitate and ensuring that the concentration of the titanium oxysulfate solution will not decrease. Stir evenly, then adjust the pH of the titanium oxysulfate solution to 7 - 8.5 and heat it to a slightly boiling state. The slightly boiling state promotes the entry of titanium oxysulfate into the pores of diatomite, maintain for 6 - 8 hours, filter, wash, and dry to obtain the fourth intermediate.

[0046] During the period when the pH is raised and the temperature is raised, titanium oxysulfate hydrolyzes to produce metatitanic acid. Due to the extremely low solubility of metatitanic acid, a large amount of metatitanic acid adheres to the pore walls of diatomite.

[0047] 5) Heat the fourth intermediate to 550 - 650 °C and maintain for 10 - 15 hours to obtain the fifth intermediate. By heating, metatitanic acid decomposes into titanium dioxide, that is, a large amount of titanium dioxide will adhere to the pore walls of diatomite. The decomposition temperature of metatitanic acid is at least above 500 °C, and as the temperature increases, the decomposition rate also increases. In some comparative experiments, it was found that when the temperature is heated above 650 °C, sintering and closed pores of diatomite can be seen under a microscope, resulting in a decrease in the specific surface area of diatomite. Therefore, the temperature is preferably controlled between 550 - 650 °C, more preferably 610 ± 5 °C.

[0048] Since titanium dioxide is loaded on the pore walls of diatomite, the roughness of the pore walls is increased, thereby increasing the specific surface area of diatomite by about 8%. At the same time, titanium dioxide is also a common material in the medical field and has good biocompatibility. When used in conductive gels, it can improve the biocompatibility of the gels, reduce skin irritation, and reduce allergies.

[0049] 6) Treat the fifth intermediate with a nano grinder to obtain modified nano diatomite.

[0050] Sample tests were conducted on the modified nano diatomite from five batches, and the specific surface areas reached 255.4㎡ / g, 247.2㎡ / g, 264.6㎡ / g, 248.7㎡ / g, and 277.4㎡ / g respectively.

[0051] As Figure 1 shown, rich pore structures are formed on the modified nano diatomite, and the pore walls are thin, so the specific surface area is large. It should be noted here that the microscopic structures of the modified nano diatomite obtained under not all processes are as Figure 1As shown, there may be some differences in the pore shape and distribution, which are mainly caused by the diatomite raw material. Diatomite is a siliceous sediment formed by the complex physical and chemical changes of ancient diatom remains. Since there are many types of diatoms, there will be relatively large differences in the pore shape and distribution in the initial state of diatomite, resulting in possible differences in the modified nano-diatomite under different raw materials. In addition, under the process of Example 1, the improvement cost is also relatively low.

[0052] Example 2: The conductive gel of the electrocardiograph, by weight, includes 5-8 parts of a conductive medium, 25-35 parts of a hydrogel monomer, 2-3 parts of a cross-linking agent, 70-100 parts of deionized water, 1-2 parts of an electrolyte, 1-2 parts of a humectant, and 10-20 parts of the modified nano-diatomite in Example 1. Preferably, it includes 6.5 parts of a conductive medium, 30 parts of a hydrogel monomer, 2.5 parts of a cross-linking agent, 80 parts of deionized water, 1.5 parts of an electrolyte, 1.5 parts of a humectant, and 15 parts of the modified nano-diatomite. Some additives can also be added as needed, including a dispersant, an antioxidant, etc.

[0053] The conductive medium is carbon nanotube powder, the hydrogel monomer is hydroxyalkyl methacrylate, acrylamide derivative, hydroxyethyl methacrylate, polyethylene glycol diacrylate or sodium polyacrylate, the electrolyte is sodium chloride or potassium chloride, and the humectant is glycerol.

[0054] It should be noted here that there are already many types of conductive gels on the market whose components include a conductive medium, a hydrogel monomer, a cross-linking agent, deionized water, an electrolyte and a humectant, such as the medical conductive gel produced by Suzhou Loctite Medical Technology Co., Ltd. Compared with this type of conductive gel, the most important feature of Example 2 is the addition of modified nano-diatomite. Or it is also possible to directly use the finished products of this type of conductive gel on the market, add modified nano-diatomite to it, and then mix well with a colloid mill.

[0055] Diatomite itself has hygroscopicity and moisture release properties. After being added to the gel, it can maintain the humidity of the gel stable, but this requires a certain amount of diatomite in the gel. However, since diatomite itself does not have conductivity, adding too much will increase the gel resistance and reduce the conductive performance. And due to the relatively small specific surface area of diatomite on the market, on the basis of meeting the requirement of maintaining the humidity of the gel stable, the addition amount will be relatively large. By using the modified nano-diatomite in Example 1, on the basis of reducing the addition amount, the requirement of maintaining the humidity of the gel stable is met. After testing, the conductivity (30 °C) of the conductive gel is 110-140 mS / cm, and the conductivity meets the standard.

[0056] Example 3: The using device of the conductive gel. The using device can be used for the conductive gel of Example 2, and can also be used for existing conductive gels, such as Figure 2As shown in the figure, it includes a cuboid-shaped outer shell 1. Inside the outer shell 1, there is an inverted "L"-shaped partition 2. The top of the partition 2 is provided with exhaust micropores. The outside of the partition 2 forms an electric control chamber 3. The electric control chamber 3 is in air communication with the outside through gaps, micropores, etc. The inside of the partition 2 forms a gel chamber 4. Inside the electric control chamber 3, there is a motor 5 and a control mechanism connected to the motor 5. The type of the motor 5 is a reduction motor. The motor 5 is located at the top of the gel chamber 4. Inside the gel chamber 4, there is a piston 7. The cross-sectional shape of the piston 7 matches the cross-sectional shape of the gel chamber 4. Axially on the piston 7, there is a screw rod 8 connected to the output end of the motor 5. The bottom of the gel chamber 4 is rotatably connected to an extrusion head 9. The lower end of the extrusion head 9 is provided with an applicator 10. The applicator 10 communicates with the gel chamber 4 through the extrusion head 9.

[0057] The extrusion head 9 is a tubular structure. The upper end of the extrusion head 9 is located inside the gel chamber 4, and the lower end of the extrusion head 9 is located below the gel chamber 4. On the side wall of the extrusion head 9, there is a feed port 11. The feed port 11 connects the inner hole of the gel chamber 4 and the extrusion head 9. The upper end of the extrusion head 9 is connected to the screw rod 8 through an acceleration mechanism 12. The acceleration mechanism 12 is used to make the rotation speed of the extrusion head 9 higher than the rotation speed of the screw rod 8.

[0058] The acceleration mechanism 12 includes an internal gear ring 13 and a bracket 14. The internal gear ring 13 is fixed inside the gel chamber 4 through a connecting rod. Inside the internal gear ring 13, there is a first gear 15 connected to the extrusion head 9. Between the first gear 15 and the internal gear ring 13, there are at least three second gears 16 evenly distributed circumferentially. The second gears 16 are rotatably connected to the bracket 14. The special structure of the acceleration mechanism 12 enables the screw rod 8 and the extrusion head 9 not to be subjected to radial forces during the power transmission process, avoiding their bending and reducing the failure rate of the device.

[0059] The applicator 10 is in the shape of a circular plate. The top of the applicator 10 is screwed to the extrusion head 9. Inside the applicator 10, there is a flat buffer cavity 17. The buffer cavity 17 communicates with the inner hole of the extrusion head 9. On the bottom surface of the applicator 10, there is a flat groove 18. The depth of the groove 18 is 0.2 - 0.5 mm. Between the groove 18 and the buffer cavity 17, there are multiple extrusion holes 19. The buffer cavity 17 can make the gel extruded from each extrusion hole 19 have a similar speed, so that the extrusion is more uniform after extrusion.

[0060] The control mechanism is used to control the forward rotation, reverse rotation and forward rotation time of the motor, and includes an extrusion button 20, a material extraction button 21, a controller 22, a storage battery 23, and a charging interface 24. The extrusion button 20, the material extraction button 21 and the charging interface 24 are all fixed on the side wall of the electric control bin 3. The controller 22 and the storage battery 23 are both located inside the electric control bin 3. The extrusion button 20 and the material extraction button 21 are respectively connected to two signal input ends of the controller 22. The motor 5 is connected to the storage battery 23 through the controller 22. The motor 5 is connected to the relay output port of the controller 22. The storage battery 23 is connected to the charging interface 24, and the storage battery 23 stores electrical energy through the charging interface 24. The model of the controller 22 is FX2N(MR). For a more specific connection method, please refer to the user manual of the controller 22.

[0061] Usage method: As Figure 2 shown, the gel bin is filled with gel, and the gel is located below the piston 7. Press the extrusion button 20, and one of the signal input ends of the controller 22 obtains a first signal. The controller 22 exerts a delay relay function to conduct the motor 5 and the storage battery 23 for a period of time. During this period, the motor 5 drives the screw 8 to rotate forward, causing the piston 7 to descend. The piston 7 extrudes the gel, and the gel enters the extrusion head 9 from the feed port 11, enters the buffer cavity 17, and then is evenly extruded from the extrusion hole 19. While the screw 8 rotates, it drives the bracket 14 to rotate. Since the internal gear ring 13 is fixed, the second gear 16 is forced to rotate, driving the first gear 15 to rotate. The first gear 15 drives the applicator head 10 to rotate through the extrusion head 9. After the bottom surface of the applicator head 10 is attached to the skin, the extruded gel enters the groove 18 and is evenly applied. The setting of the groove 18 reduces the overflow of the gel.

[0062] When the gel in the bin is used up, remove the applicator head 10, insert the lower end of the extrusion head 9 into the container for replenishing the gel, press the material extraction button 21, and one of the signal input ends of the controller 22 continuously obtains a second signal, making the motor 5 conduct with the storage battery 23 and the motor 5 rotate in the reverse direction. The piston 7 rises, creating a negative pressure in the gel bin 4, and sucking the gel into the gel bin 4 until the suction is complete. Release the material extraction button 21, and the motor 5 stops working. Since the gel is sucked by negative pressure, preferably, a sealing ring is provided on the outside of the piston 7, and the screw connection between the screw 8 and the piston 7 should be selected with high precision to eliminate the gap between the two, or the material at the inner hole of the piston 7 is selected as rubber and elastically connected to the screw 8.

[0063] The purpose of setting the acceleration mechanism 12 between the screw 8 and the extrusion head 9 is that the single extrusion amount of the gel is small, resulting in that the screw 8 only needs to rotate a small angle to meet the extrusion requirement of the gel. However, the applicator head 10 needs to rotate more turns to evenly apply the gel, and the acceleration mechanism 12 can increase the number of turns of the applicator head 10. The rotation speed ratio of the screw 8 to the applicator head 10 is determined by the diameter ratio of the second gear 16 and the first gear 15.

[0064] Example 4: On the basis of Example 3, the using device further includes a placement seat on which the using device can be placed in a vertical state when it is idle.

[0065] In the description of the embodiments, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation.

Claims

1. Conductive gel for electrocardiograph, characterized in that: Calculated by weight, it includes 5-8 parts of conductive medium, 25-35 parts of hydrogel monomer, 2-3 parts of cross-linking agent, 70-100 parts of deionized water, 1-2 parts of electrolyte, 1-2 parts of moisturizing agent, and 10-20 parts of modified nano diatomaceous earth. The specific surface area of ​​the improved diatomaceous earth is greater than 240 m2 / g.

2. The conductive gel according to claim 1, characterized in that: The conductive medium comprises 6.5 parts, a hydrogel monomer comprises 30 parts, a cross-linking agent comprises 2.5 parts, deionized water comprises 80 parts, an electrolyte comprises 1.5 parts, a moisturizing agent comprises 1.5 parts, and modified nano-diatomaceous earth comprises 15 parts.

3. The conductive gel according to claim 1, characterized in that: The conductive medium is carbon nanotube powder, the hydrogel monomer is hydroxyalkyl methacrylate, acrylamide derivative, hydroxyethyl methacrylate, polyethylene glycol diacrylate or sodium polyacrylate, the electrolyte is sodium chloride or potassium chloride, and the moisturizer is glycerol.

4. The conductive gel according to claim 1, characterized in that: The production process of the modified nano diatomite, The following steps are included: 1) Obtain diatomaceous earth raw material, grind the diatomaceous earth raw material into powder, and obtain intermediate No. 1; 2) Soak the No. 1 intermediate in a nitric acid solution with a concentration of 20%-30%, let it stand for 2-3 hours, wash and dry to obtain the No. 2 intermediate; 3) Soak the intermediate No. 2 in a sodium hydroxide solution with a concentration of 5-10% and a temperature of 120-200°C and leave it to stand for 10-15 hours, wash and dry to obtain the intermediate No. 3; 4) Soaking the intermediate No. 3 in a titanyl sulfate solution with a pH value of less than 4, stirring evenly, adjusting the pH of the titanyl sulfate solution to 7-8.5, and heating to a slightly boiling state, maintaining for 6-8 hours, filtering, washing, and drying to obtain the intermediate No. 4; 5) Heat the intermediate No. 4 to 550-650°C and keep it at this temperature for 10-15 hours to obtain the intermediate No. 5; 6) Grind the intermediate No. 5 to obtain modified nano diatomite.

5. The conductive gel according to claim 4, characterized in that: In the step 2), the concentration of the nitric acid solution is 24.5%, and the standing time is 2.5 hours.

6. The conductive gel according to claim 4, characterized in that: In the step 3), the sodium hydroxide solution has a concentration of 8%, a temperature of 180° C., and is allowed to stand for 12 hours.

7. The conductive gel according to claim 4, characterized in that: In the step 5), the intermediate No. 4 is heated to 610±5°C.

8. The device for using the conductive gel according to any one of claims 1 to 7, characterized in that: The invention comprises a rectangular parallelepiped housing (1), an inverted "L"-shaped partition (2) is arranged inside the housing (1), an electric control chamber (3) is formed on the outer side of the partition (2), a gel chamber (4) is formed on the inner side of the partition (2), a motor (5) and a control mechanism connected to the motor (5) are arranged inside the electric control chamber (3), the motor (5) is located at the top of the gel chamber (4), a piston (7) is arranged inside the gel chamber (4), a screw (8) connected to the output end of the motor (5) is arranged axially on the piston (7), and an extruder (9) is rotatably connected to the bottom of the gel chamber (4).

9. The device for using the conductive gel according to claim 8, characterized in that: The lower end of the extrusion head (9) is provided with a coating head (10), and the coating head (10) is connected to the gel chamber (4) through the extrusion head (9); the extrusion head (9) is a tubular structure, the upper end of the extrusion head (9) is located in the gel chamber (4), the lower end of the extrusion head (9) is located below the gel chamber (4), a feed port (11) is provided on the side wall of the extrusion head (9), the feed port (11) connects the gel chamber (4) and the inner hole of the extrusion head (9), and the upper end of the extrusion head (9) is connected to the screw (8) through an acceleration mechanism (12).

10. The device for using the conductive gel according to claim 9, characterized in that: The acceleration mechanism (12) comprises an inner gear ring (13) and a bracket (14); the inner gear ring (13) is fixed in the gel chamber (4); a first gear (15) connected to the extruder head (9) is provided on the inner side of the inner gear ring (13); at least three second gears (16) evenly distributed in the circumferential direction are provided between the first gear (15) and the inner gear ring (13); and the second gears (16) are rotatably connected to the bracket (14); The smear head (10) is in the shape of a circular plate. The top of the smear head (10) is screwed to the extrusion head (9). A flat buffer cavity (17) is provided in the smear head (10). The buffer cavity (17) is connected to the inner hole of the extrusion head (9). A flat groove (18) is provided on the bottom surface of the smear head (10). The depth of the groove (18) is 0.2-0.5 mm. A plurality of extrusion holes (19) are provided between the groove (18) and the buffer cavity (17).

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