CN106691516B

CN106691516B - Skin tester with humidity detection function

Info

Publication number: CN106691516B
Application number: CN201710128214.0A
Authority: CN
Inventors: 陈健
Original assignee: Guilin Wandom Medical Apparatus Co ltd
Current assignee: Guilin Wandom Medical Apparatus Co ltd
Priority date: 2017-03-06
Filing date: 2017-03-06
Publication date: 2023-05-05
Anticipated expiration: 2037-03-06
Also published as: CN106691516A

Abstract

The invention discloses a skin tester with a humidity detection function, which comprises a host and an electrode head, wherein a main control circuit is arranged in the host; the main control circuit comprises a microcontroller and a humidity detection circuit. The humidity detection circuit comprises a humidity sensor U1, a voltage comparator U1-A, a humidity sensitive resistor R2 and a resistor R2. In consideration of that the accuracy of the electrode tip required at different stages in the skin test process is also different, in order to accurately detect the wettability of the electrode tip and prevent false detection, the humidity detection circuit adopts a mode that the humidity sensor U1 and the humidity sensitive resistor R2 are mutually matched for detection, so that the humidity of the liquid medicine dripped on the electrode tip can be read by an instrument in the skin test process, the real-time monitoring value is carried out on the humidity of the electrode tip in contact with the skin in the skin test, and the reliability of the skin test result is ensured.

Description

Skin tester with humidity detection function

Technical Field

The invention relates to the technical field of skin testers, in particular to a skin tester with a humidity detection function.

Background

The allergic reaction of the medicine refers to the adverse reaction generated after a patient with specific physique uses a certain medicine, and the adverse reaction is manifested by skin disease, asthma or fever, and shock can even endanger life when serious. In order to prevent allergic reactions, particularly severe allergic reactions, some medicines which are easy to generate allergic reactions need to be subjected to skin sensitivity test before being used, medicines with negative skin test can be used for patients, and medicines with positive skin test can be forbidden to be used.

The skin tester is used for testing drug allergy, has the characteristics of convenient operation, stable quality, safety, no wound and no pain, and is welcomed by medical staff and patients in clinical practical value. The skin tester applies the principle of the iontophoresis percutaneous osmosis method, and under the action of a pulse electric field, drug ions or charged drugs dripped on the electrode tip are positioned by the electrode tip to be painlessly led into the skin. However, since the accuracy of the skin test result of the skin test device depends on the reliable contact between the drug and the skin within a certain period of time, the problem that the skin test result is affected due to insufficient dropping amount or volatilization of the drug on the electrode tip and the effective contact between the drug and the skin within a predetermined period of time is often caused in the conventional skin test device.

Disclosure of Invention

The invention aims to solve the technical problem that the skin test effect is affected by insufficient humidity on an electrode head in the skin test process of the existing skin test instrument, and provides the skin test instrument with the humidity detection function.

In order to solve the problems, the invention is realized by the following technical scheme:

the skin tester with the humidity detection function comprises a host and an electrode head, wherein a main control circuit is arranged in the host; the main control circuit comprises a microcontroller, and the difference is that the main control circuit further comprises a humidity detection circuit; the humidity detection circuit comprises a humidity sensor U1, a voltage comparator U1-A, a humidity resistor R2 and a resistor R2; the humidity sensor U1 is arranged on the electrode head; the bidirectional data end SDA of the humidity sensor U1 is connected with one data input end of the microcontroller, and the clock end SCL of the humidity sensor U1 is connected with the clock end of the microcontroller; the power end VDD of the humidity sensor U1 is connected with a high level, and the ground end VSS of the humidity sensor U1 is grounded; the humidity-sensitive resistor R2 is also arranged on the electrode head; one end of the humidity sensitive resistor R2 is grounded, the other end of the humidity sensitive resistor R2 is divided into two paths, one path is connected with a high level through the resistor R1, and the other path is connected with the non-inverting input end of the voltage comparator U1-A; the reverse input end of the voltage comparator U1-A is connected with a high level; the output end of the voltage comparator U1-A is connected with the other data input end of the microcontroller.

In the above scheme, the high level connected to the inverting input terminal of the resistor R1 and the voltage comparator U1-a is 0.7V.

In the above scheme, the high level connected to the power supply terminal VDD of the humidity sensor U1 is 3.3V.

Compared with the prior art, the invention detects the humidity on the electrode tip by adding the humidity detection circuit on the electrode tip of the skin test instrument, and adopts a double-humidity detection mode when detecting the humidity, thereby ensuring the effective contact between the medicine on the electrode tip and the skin within the preset time in the skin test process and ensuring the reliability of the skin test result.

Drawings

Fig. 1 is a schematic diagram of a skin tester with humidity detection.

Detailed Description

A skin tester with humidity detection function comprises a main machine and an electrode head. The host is internally provided with a main control circuit. The main control circuit comprises a microcontroller and a humidity detection circuit. The humidity detection circuit includes a humidity sensor U1, a voltage comparator U1-A, a humidity resistor R2, and a resistor R2, as shown in FIG. 1.

The humidity sensor U1 is provided on the electrode head. The bidirectional data end SDA of the humidity sensor U1 is connected with one data end of the microcontroller, and the clock end SCL of the humidity sensor U1 is connected with the clock end of the microcontroller; the power end VDD of the humidity sensor U1 is connected to a high level of 3.3V, and the ground end VSS of the humidity sensor U1 is grounded.

The humidity resistor R2 is also arranged on the electrode head. One end of the humidity sensitive resistor R2 is grounded, the other end of the humidity sensitive resistor R2 is divided into two paths, one path is connected with a high level of 0.7V through the resistor R1, and the other path is connected with the non-inverting input end of the voltage comparator U1-A; the reverse input end of the voltage comparator U1-A is connected with a high level of 0.7V; the output end of the voltage comparator U1-A is connected with the other input end of the microcontroller.

The working process of the invention is as follows:

considering that the wettability of the electrode tip is generally smaller, in order to accurately detect the wettability of the electrode tip and prevent false detection, the invention adopts a mode of mutually matching and detecting the humidity sensor U1 and the humidity sensitive resistor R2.

Before skin test, the humidity of the liquid medicine dripped on the electrode head is read by the humidity resistor R2 and then is sent to the voltage comparator, and if the humidity acquired by the humidity resistor value is within the range, the voltage comparator U1-A outputs a high level to the microcontroller; otherwise, output low to the microcontroller. In the process of dripping skin test liquid to the electrode tip, if the humidity of the electrode tip meets the skin test requirement, the microcontroller can acquire high level from the voltage comparator U1-A, the instrument prompts that skin test can be performed, and at the moment, the doctor fixes the electrode tip on the arm of a patient to start skin test; otherwise, it cannot.

In the skin test process, under the condition that the voltage comparator U1-A reads that the humidity accords with, the humidity value of the electrode tip is monitored in real time through the humidity sensor U1, and the microcontroller automatically judges the output waveform intensity of the electrode tip according to the humidity value, so that the purpose of controlling the drug permeation quantity is achieved. In the whole skin test process, the humidity sensor U1 continuously detects the real-time humidity of the electrode tip, and once the humidity does not meet the requirement, the instrument gives an alarm to inform a doctor that the skin test needs to be carried out again.

Claims

1. The skin tester with the humidity detection function comprises a host and an electrode head, wherein a main control circuit is arranged in the host; the main control circuit includes microcontroller, its characterized in that: the main control circuit further comprises a humidity detection circuit;

the humidity detection circuit comprises a humidity sensor U1, a voltage comparator U1-A, a humidity resistor R2 and a resistor R1;

the humidity sensor U1 is arranged on the electrode head; the bidirectional data end SDA of the humidity sensor U1 is connected with one data input end of the microcontroller, and the clock end SCL of the humidity sensor U1 is connected with the clock end of the microcontroller; the power end VDD of the humidity sensor U1 is connected with a high level, and the ground end VSS of the humidity sensor U1 is grounded;

the humidity-sensitive resistor R2 is also arranged on the electrode head; one end of the humidity sensitive resistor R2 is grounded, the other end of the humidity sensitive resistor R2 is divided into two paths, one path is connected with a high level through the resistor R1, and the other path is connected with the non-inverting input end of the voltage comparator U1-A; the reverse input end of the voltage comparator U1-A is connected with a high level; the output end of the voltage comparator U1-A is connected with the other data input end of the microcontroller.

2. The skin tester with humidity detection function according to claim 1, wherein: the high level at the inverting input of resistor R1 and voltage comparator U1-A is 0.7V.

3. The skin tester with humidity detection function according to claim 1, wherein: the high level of the power supply terminal VDD of the humidity sensor U1 is 3.3V.