CN110655663A - Medical conductive gel and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of medical conductive materials, and particularly relates to a medical conductive gel and a preparation method thereof. The medical conductive gel comprises the following components in percentage by mass: 2-10% of salt electrolyte, 5-35% of water-retaining agent, 10-20% of gelling agent and 50-80% of water. The medical conductive gel provided by the invention has excellent biocompatibility and wettability, lower contact impedance and noise and can be used in the field of medical electrodes by dispersing the water-retaining agent, the salt electrolyte and the gelling agent in water and by the synergistic effect of the water, the water-retaining agent, the salt electrolyte and the gelling agent.

Description

Medical conductive gel and preparation method thereof

Technical Field

The invention belongs to the technical field of medical conductive materials, and particularly relates to a medical conductive gel and a preparation method thereof.

Background

The medical conductive adhesive is used as an intermediate medium between a human body and a medical electrode, and has important application value in the field of medical instruments such as electrocardiogram and electroencephalogram. The conductive performance of the conductive adhesive directly influences the detection result, and in addition, the medical conductive adhesive has to have good biocompatibility, namely, the medical conductive adhesive has the characteristics of no cytotoxicity, no stimulation to human skin, sensitization and the like.

The conductive adhesive is divided into liquid conductive adhesive and solid conductive adhesive. The liquid medium has stronger penetrating power and wetting effect on the skin, and along with the monitoring, the liquid medium has higher penetration, higher conductivity, lower impedance and more accurate and stable measurement result. However, the liquid conductive adhesive has a narrow application range, needs a complex structural design for support, has a short volatile service life and a short storage time, and is not beneficial to industrialization. The solid conductive adhesive is convenient for industrialized die cutting forming, but has poor conductivity and high contact impedance, and the electrode prepared by the conductive hydrogel has high noise and cannot be used for collecting weak signals.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides the medical conductive gel which has good biocompatibility, low contact impedance and low noise and can be used for weak signal acquisition and the preparation method thereof.

Aiming at the technical purpose, the invention adopts the following technical scheme:

the medical conductive gel comprises the following components in percentage by mass: 2-10% of salt electrolyte, 5-35% of water-retaining agent, 10-20% of gelling agent and 50-80% of water.

As a further improvement of the invention, the salt electrolyte is NaCl or KCl or a mixture of the NaCl and the KCl, the water-retaining agent is glycerol or sodium polyacrylate, the gelling agent is one or more than two of pectin, gelatin, carrageenan, agar and gellan gum, and the water is deionized water.

In addition, the invention also provides a preparation method of the medical conductive gel, which comprises the following steps:

(1) adding the water into a reaction kettle, heating to 50-70 ℃, and stirring at 150-300 revolutions per minute after heating; adding the salt electrolyte into a reaction kettle, and stirring continuously and keeping constant temperature during the period; stirring for 5-15 minutes;

(2) mixing the gelling agent and the water-retaining agent, and stirring to obtain a mixed solution; then slowly adding the mixed solution into a reaction kettle, and stirring at a low speed while adding, wherein the stirring speed is 10-50 revolutions per minute; stirring at 150-300 rpm after the addition is finished, wherein the duration is 1-3 hours;

(3) and (3) injection molding the solution synthesized in the step (2), and cooling at room temperature for 6-24h for molding to finish the preparation of the conductive gel.

Compared with the prior art, the medical conductive gel provided by the invention has the advantages that the water-retaining agent, the salt electrolyte and the gelling agent are dispersed in water, and the water, the water-retaining agent and the gelling agent are added to have a synergistic effect to form an intermolecular hydrogen bond, so that the salt electrolyte which is easy to be compatible is doped to play an ion conduction role; the medical conductive gel can be converted into liquid from solid gel after contacting with human skin, has stronger penetrating power and wetting effect on the skin, has excellent wettability, further reduces contact impedance, reduces the change of contact capacitance, further improves the sensitivity of the medical conductive gel to signal collection, and has more accurate and stable measurement result.

The medical conductive gel disclosed by the invention is simple in preparation process, simple in production equipment, low in production cost, easy to industrialize, simple and easily available in raw materials, safe and environment-friendly.

In addition, the medical conductive gel has low contact impedance and low noise, and can be used for collecting human electrophysiological signals such as electrocardio, fetal electrocardio, electroencephalogram, myoelectricity and the like.

Detailed Description

Example 1

The embodiment provides a medical conductive gel and a preparation method thereof. The medical conductive gel of the embodiment specifically comprises potassium chloride, glycerol, gelatin and deionized water.

The preparation method of the medical conductive gel comprises the following steps:

(1) adding 100 parts of water into a reaction kettle, and heating to 50-70 ℃; after the temperature rise is finished, stirring the mixture at 150 revolutions per minute, adding 4 parts of potassium chloride into the reaction kettle (stirring continuously and keeping constant temperature), and stirring for 15 minutes;

(2) mixing 14 parts of gelatin and 20 parts of glycerol, stirring to obtain a mixed solution, slowly adding the mixed solution into a reaction kettle, stirring at a low speed while adding, wherein the stirring speed is 30 revolutions per minute, and stirring at 200 revolutions per minute for 2 hours after adding;

(3) and (3) injection molding the synthesized solution, and cooling at room temperature for 10 hours to form the conductive gel.

Example 2

The embodiment provides a medical conductive gel and a preparation method thereof. The medical conductive gel of the embodiment specifically comprises potassium chloride, glycerol, gelatin and deionized water.

The preparation method of the medical conductive gel comprises the following steps:

(1) adding 100 parts of water into a reaction kettle, and heating to 50-70 ℃; after the temperature rise is finished, stirring the mixture at 150 revolutions per minute, adding 5 parts of potassium chloride into the reaction kettle (stirring continuously and keeping constant temperature), and stirring for 15 minutes;

(2) mixing 14 parts of gelatin and 20 parts of glycerol, stirring to obtain a mixed solution, slowly adding the mixed solution into a reaction kettle, stirring at a low speed while adding, wherein the stirring speed is 30 revolutions per minute, and stirring at 200 revolutions per minute for 2 hours after adding;

(3) and (3) injection molding the synthesized solution, and cooling at room temperature for 10 hours to form the conductive gel.

Example 3

The embodiment provides a medical conductive gel and a preparation method thereof. The medical conductive gel of the embodiment specifically comprises potassium chloride, glycerol, gelatin and deionized water.

The preparation method of the medical conductive gel comprises the following steps:

(1) adding 100 parts of water into a reaction kettle, and heating to 50-70 ℃; after the temperature rise is finished, stirring the mixture at 150 revolutions per minute, adding 6 parts of potassium chloride into the reaction kettle (stirring continuously and keeping constant temperature), and stirring for 15 minutes;

(2) mixing 14 parts of gelatin and 20 parts of glycerol, stirring to obtain a mixed solution, slowly adding the mixed solution into a reaction kettle, stirring at a low speed while adding, wherein the stirring speed is 30 revolutions per minute, and stirring at 200 revolutions per minute for 2 hours after adding;

(3) and (3) injection molding the synthesized solution, and cooling at room temperature for 10 hours to form the conductive gel.

Example 4

The embodiment provides a medical conductive gel and a preparation method thereof. The medical conductive gel of the embodiment specifically comprises potassium chloride, glycerol, gelatin and deionized water.

The preparation method of the medical conductive gel comprises the following steps:

(1) adding 100 parts of water into a reaction kettle, and heating to 50-70 ℃; after the temperature rise is finished, stirring the mixture at 150 revolutions per minute, adding 5 parts of potassium chloride into the reaction kettle (stirring continuously and keeping constant temperature), and stirring for 15 minutes;

(2) mixing 20 parts of gelatin and 20 parts of glycerol, stirring to obtain a mixed solution, slowly adding the mixed solution into a reaction kettle, stirring at a low speed while adding, wherein the stirring speed is 30 revolutions per minute, and stirring at 200 revolutions per minute for 2 hours after adding;

(3) and (3) injection molding the synthesized solution, and cooling at room temperature for 10 hours to form the conductive gel.

Example 5

The embodiment provides a medical conductive gel and a preparation method thereof. The medical conductive gel of the embodiment specifically comprises potassium chloride, glycerol, gelatin and deionized water.

The preparation method of the medical conductive gel comprises the following steps:

(1) adding 100 parts of water into a reaction kettle, and heating to 50-70 ℃; after the temperature rise is finished, stirring the mixture at 150 revolutions per minute, adding 5 parts of potassium chloride into the reaction kettle (stirring continuously and keeping constant temperature), and stirring for 15 minutes;

(2) mixing 30 parts of gelatin and 20 parts of glycerol, stirring to obtain a mixed solution, slowly adding the mixed solution into a reaction kettle, stirring at a low speed while adding, wherein the stirring speed is 30 revolutions per minute, and stirring at 200 revolutions per minute for 2 hours after adding;

(3) and (3) injection molding the synthesized solution, and cooling at room temperature for 10 hours to form the conductive gel.

And (4) relevant performance test:

conductive gels have three relatively important performance criteria: the medical conductive gel prepared in the above examples 1 to 5 was subjected to the related performance tests shown in table 1 below, and the conductive paste and the conductive hydrogel on the market at present were tested, the electrode on the wearable fetal electrocardiogram sensor of this company was used as the test electrode, the recorder host machine matched with the wearable fetal electrocardiogram monitor of this company was used as the signal acquisition device, and the test results are shown in table 1.

TABLE 1

Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.

Claims (7)

1. The medical conductive gel is characterized by comprising the following components in percentage by mass: 2-10% of salt electrolyte, 5-35% of water-retaining agent, 10-20% of gelling agent and 50-80% of water.

2. The medical conductive gel of claim 1, wherein: the salt electrolyte is NaCl or KCl or the mixture of the NaCl and the KCl.

3. The medical conductive gel of claim 1, wherein: the water-retaining agent is glycerol or sodium polyacrylate.

4. The medical conductive gel of claim 1, wherein: the gelling agent is one or more than two of pectin, gelatin, carrageenan, agar and gellan gum.

5. The medical conductive gel of claim 1, wherein: the water is deionized water.

6. The method for preparing the medical conductive gel according to claim 1, comprising the steps of:

(1) adding the water according to claim 1 into a reaction kettle, heating to 50-70 ℃, and stirring at 150-300 r/min after heating; adding the salt electrolyte of claim 1 into a reaction kettle, and continuously stirring and keeping constant temperature during the period; stirring for 5-15 minutes;

(2) mixing the gelling agent of claim 1 with a water-retaining agent, and stirring to obtain a mixed solution; then slowly adding the mixed solution into a reaction kettle, and stirring at a low speed while adding, wherein the stirring speed is 10-50 revolutions per minute; stirring at 150-300 rpm after the addition is finished, wherein the duration is 1-3 hours;

(3) and (3) injection molding the solution synthesized in the step (2), and cooling at room temperature for 6-24h for molding to finish the preparation of the conductive gel.

7. The medical conductive gel prepared by the preparation method of claim 6 is applied to the field of medical electrodes such as electrocardio, fetal electrocardio, electroencephalogram, myoelectric electrodes and the like.