Needle heating circuit with unidirectional pulse output

Abstract

The utility model provides a single pulse output needle heating circuit, and belongs to the technical field of medical electric heating needle heating equipment. The single pulse output needle heating circuit comprises a power supply module and a plurality of groups of mutually isolated half-bridge output loops, the half-bridge output loops are mutually connected in parallel, the load end of each output circuit is used for being connected with an electric heating needle, each half-bridge output loop is connected to a control module, and the control module is connected with the power supply module. And the control module sequentially controls the on-off of each half-bridge output loop according to a preset time sequence. The circuit is simple, good in isolation effect and suitable for miniaturization design.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical electrothermal needle heating equipment, and particularly relates to a needle heating circuit with unidirectional pulse output. Background Art

[0002] Acupuncture is a traditional Chinese medicine treatment method that uses fine needles to pierce acupuncture points on the human body. In recent years, therapeutic devices that use electrical stimulation to achieve acupuncture have appeared on the market, such as devices that use trans-needle electrical stimulation to achieve acupuncture and devices that use transcutaneous electrical stimulation to achieve acupuncture. With the changes in technology, people's requirements for new electroacupuncture instruments are getting higher and higher; the existing new electroacupuncture instruments generally use multi-channel synchronous output or power supply isolation between each channel through an output transformer when in use. Both of the above circuits have their own problems: 1. The stimulated individual is prone to tolerance, thereby reducing the treatment effect; the power requirements for the power supply are relatively high, and in battery-powered situations, it is easy to cause the battery voltage to drop instantly and fail to work normally. 2. Due to the large size of the transformer, it is not conducive to the miniaturization of the instrument; and due to the loss of the transformer and other reasons, the symmetry of the positive and negative pulses is not good, and the output pulse has a DC component, which is the root cause of the electrochemical corrosion of the electrode needle. Corrosion may cause the electrode needle to rust and break in the human body, causing medical accidents. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a needle heating circuit with unidirectional pulse output to overcome the deficiencies of the prior art.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a needle heating circuit with unidirectional pulse output, used for medical electric heating needle heating equipment, characterized in that it includes a power supply module, a plurality of groups of mutually isolated half-bridge output circuits, each half-bridge output circuit is connected in parallel with each other, the load end of each half-bridge output circuit is used to connect the electric heating needle, each half-bridge output circuit is connected to a control module, and the control module controls the on and off of each half-bridge output circuit in sequence according to a preset timing.

[0005] Preferably, the half-bridge output circuit is composed of two isolating switches, the electric heating needle is connected in series between the two isolating switches, the input end of the half-bridge output circuit is connected to the power supply module, the output end is grounded through a diode, the isolating switch is connected to the control module and is controlled by the control module to disconnect or connect the half-bridge output circuit.

[0006] Preferably, the isolating switch is a photoelectric isolating switch, the electric heating needle is connected in series between the receivers of two photoelectric isolating switches, and the transmitter of each photoelectric isolating switch is connected to the control module and emits light according to the instructions of the control module to control the conduction of the corresponding receiver.

[0007] Preferably, the diode is an LED indicator light.

[0008] Preferably, the control module is a single chip microcomputer.

[0009] Compared with the prior art, the circuit controls each half-bridge output circuit according to a preset timing through a control module, which not only realizes power isolation of different output circuits, but also ensures that only one electric heating needle is heating at any time, avoiding the formation of a loop between the electric heating needles of the same human body, causing electrochemical corrosion of the electric heating needles, and also avoids the problem of large circuit board volume caused by excessive transformer volume, thereby reducing manufacturing costs and use costs, and facilitating product miniaturization for easy carrying. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 1 is a schematic diagram of a needle heating circuit with unidirectional pulse output according to an embodiment.

[0011] Figure 2 2 is a timing diagram of each photoelectric switch of the embodiment.

[0012] Figure 3 4 is a waveform diagram of the current supply to each electric heating needle in the embodiment. DETAILED DESCRIPTION

[0013] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0014] like Figure 1 As shown, the utility model provides a needle heating circuit with unidirectional pulse output for medical electric needle heating equipment, including a power module, a plurality of groups of mutually isolated half-bridge output circuits, and each half-bridge output circuit is connected in parallel. The load end of each half-bridge output circuit is connected to the electric heating needle, and each half-bridge output circuit is connected to a control module, which controls the on and off of each half-bridge output circuit in sequence according to a preset timing.

[0015] Specifically, there are n half-bridge output circuits, each of which is composed of two isolating switches, the electric heating needle is connected in series between the two isolating switches, the input end of the half-bridge output circuit is connected to the power module, the output end is grounded through a diode, and the isolating switch is connected to the control module. Among them, the diode uses an LED indicator to indicate the power on and off status of the corresponding half-bridge output circuit.

[0016] The isolating switch is a photoelectric isolating switch, and the electric heating needle is connected in series between the receivers of two photoelectric isolating switches. The transmitter of each photoelectric isolating switch is connected to the control module and emits light according to the instruction of the control module to control the conduction of the corresponding receiver.

[0017] like Figure 2, 3 As shown, the control module provides a timing signal according to the sequence of the half-bridge output circuits. Signal L1 corresponds to the first half-bridge output circuit, signal L2 corresponds to the second half-bridge output circuit, and so on. The control module is a single-chip microcomputer. The control module outputs a control signal according to the timing diagram to control the disconnection or connection of the half-bridge output circuit. Specifically, the photoelectric isolation switch in each half-bridge output circuit receives the corresponding signal of the timing diagram, opens for a certain period of time, then closes and enters the next timing, so that the current waveform diagram in the above figure can be generated on the human body impedance. Its characteristics are: each impedance is powered in time, and the same power supply VDD is reused. In this way, the isolation of different output circuits is achieved, ensuring that only one electric heating needle is heated at any time in all outputs.

[0018] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A needle heating circuit with unidirectional pulse output, used for medical electric heating needle heating equipment, characterized in that: It includes a power supply module, several groups of mutually isolated half-bridge output circuits, each half-bridge output circuit is connected in parallel, the load end of each half-bridge output circuit is used to connect the electric heating needle, each half-bridge output circuit is connected to a control module, and the control module controls the on and off of each half-bridge output circuit in sequence according to a preset timing.

2. A needle heating circuit with unidirectional pulse output according to claim 1, characterized in that: The half-bridge output circuit is composed of two isolating switches, the electric heating needle is connected in series between the two isolating switches, the input end of the half-bridge output circuit is connected to the power module, and the output end is grounded through a diode, the isolating switch is connected to the control module and is controlled by the control module to disconnect or connect the half-bridge output circuit.

3. A needle heating circuit with unidirectional pulse output according to claim 2, characterized in that: The isolating switch is a photoelectric isolating switch, the electric heating needle is connected in series between the receivers of two photoelectric isolating switches, and the transmitter of each photoelectric isolating switch is connected to the control module and emits light according to the instruction of the control module to control the conduction of the corresponding receiver.

4. A needle heating circuit with unidirectional pulse output according to claim 2 or 3, characterized in that: The diode is an LED indicator light.

5. A needle heating circuit with unidirectional pulse output according to claim 1, 2 or 3, characterized in that: The control module is a single chip microcomputer.

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