CN214259459U - Sectional type electrode needle and impedance measuring device - Google Patents
Sectional type electrode needle and impedance measuring device Download PDFInfo
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- CN214259459U CN214259459U CN202022220604.0U CN202022220604U CN214259459U CN 214259459 U CN214259459 U CN 214259459U CN 202022220604 U CN202022220604 U CN 202022220604U CN 214259459 U CN214259459 U CN 214259459U
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Abstract
The utility model relates to the technical field of ablation equipment, the existing ablation electrode needle has defects in the way of detecting the impedance of an ablation target area, the utility model provides a sectional type electrode needle and an impedance measuring device, the sectional type electrode needle comprises an insulating needle body, a conductive part arranged on the end surface of the needle body and a lead embedded in the needle body, and the lead is used for connecting the conductive part; the number of the conductive parts is at least three, and the conductive parts are sequentially arranged along the surface of the needle body in an axial direction at equal intervals; can refine the ablation target area through the sectional type electrode, can obtain regional impedance and form the impedance map of ablating the target area, make things convenient for the audio-visual observation of operating personnel to melt the interior impedance distribution condition of target area through the impedance map.
Description
Technical Field
The utility model relates to an melt equipment technical field, concretely relates to sectional type electrode needle and impedance measurement device.
Background
With the continuous development of the bioelectromagnetic technology, the technology of treating tumors by using high-voltage electric pulses is gradually accepted and accepted. The existing high-voltage pulse ablation equipment mostly adopts microsecond pulses or nanosecond pulses. Microsecond pulse width is microsecond (uS) level, electric field level is 1.5-2.0KV/cm, mainly based on the principle of destroying cell membrane to apoptosis, pulse width regulation range is 10-100 uS, voltage regulation range is 500-3000V, ablation range is limited within 3cm, and double-needle distance is controlled within 2.2 cm. The pulse width of the nanosecond pulse technology is in nanosecond (nS) level, the electric field intensity level is more than 10KV/cm, and the principle mainly aims at damaging cell nucleus, mitochondria and apoptosis. The fixed pulse width is about 300nS, the pulse width is not adjustable, and the ablation range is limited within 3 cm.
During the process of ablating the tissue by using the ablation device, the ablation range and the boundary of the tissue need to be fed back in real time, and the impedance change of an ablation target area needs to be identified in real time. The ablation range is mostly directly observed by images, and the impedance to the ablation target area is directly measured during the process of releasing the ablation pulse, or confirmed by a constant current source and voltage sampling in the interval of releasing the ablation pulse, or confirmed by a constant voltage source and current sampling. This indirect measurement method is usually performed by directly using the ablation electrode to obtain the voltage and current.
Because the discharge section of the existing electrode is mostly a whole block, the measured impedance is only a numerical value and cannot reflect the distribution condition of the impedance in the ablation target area, the information of the impedance in the ablation target area obtained by the method is limited, and equipment capable of obtaining the distribution condition of the impedance in the ablation target area is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that there is the defect in the above-mentioned mode of detecting the impedance of melting the target region through current electrode needle that melts of overcoming, provides sectional type electrode needle and impedance measurement device.
In order to achieve the above object, the present invention is achieved in a first aspect by the following technical solutions: the sectional type electrode needle comprises an insulating needle body, a conductive part arranged on the end surface of the needle body and a conducting wire embedded in the needle body, wherein the conducting wire is used for connecting the conductive part; the electrically conductive part is equipped with three at least, the electrically conductive part is followed the needle body surface sets up to axial equidistance in proper order.
The utility model discloses further preferred scheme does: the conductive part is a conductive ring, and the conductive ring is embedded on the surface of the needle body.
The utility model discloses further preferred scheme does: the widths of the conducting rings are equal, and the distances between the adjacent conducting rings are equal.
The utility model discloses further preferred scheme does: the needle body is also internally provided with a needle core for supporting the needle body.
The utility model discloses further preferred scheme does: the needle core is positioned at the axis of the needle body, and the conducting wires are uniformly distributed on the inner circumference of the needle body by taking the needle core as the center; the end part of the needle core is exposed out of the needle body and forms a needle point.
In a second aspect, the present invention provides an impedance measuring device comprising at least one pair of segmented electrode pins according to the first aspect, and a detection circuit connected to the segmented electrode pins; the detection circuit includes: a voltage reference circuit for generating a pulse voltage; the high-voltage switch array circuit comprises a plurality of high-voltage relays, and the high-voltage relays are in one-to-one correspondence with the conducting wires and are connected with the conducting parts so as to be connected with the voltage reference circuit; the current sampling circuit is connected in series on the conductive part and is used for collecting the current of the conductive part when the conductive part is conducted; and the control circuit is used for controlling the voltage reference circuit to modulate the pulse voltage, controlling the on-off of a high-voltage relay in the high-voltage switch array circuit, receiving the current magnitude acquired by the current sampling circuit and calculating an impedance value.
The utility model discloses further preferred scheme does: the voltage reference circuit comprises a direct current power supply, a switch driving circuit, a thyristor circuit, an energy storage circuit and an isolation transformer.
The utility model discloses further preferred scheme does: the impedance measuring device further comprises a display screen, wherein the display screen is connected with the control circuit and used for displaying through colors and light and shade of pixels on the image of the ablation target area according to the detected impedance value and forming an impedance map of the ablation target area.
The utility model discloses further preferred scheme does: the direct current power supply of the voltage reference circuit is a high-voltage adjustable direct current power supply, and the ablation equipment outputs ablation pulses on the secondary side of the isolation transformer through the high-voltage adjustable direct current power supply.
The utility model discloses further preferred scheme does: the voltage reference circuit comprises two groups of switch driving circuits, a thyristor circuit, an energy storage circuit and an isolation transformer, one group of the voltage reference circuit is matched with the high-voltage adjustable direct-current power supply to generate microsecond pulses, and the other group of the voltage reference circuit is matched with the high-voltage adjustable direct-current power supply to generate nanosecond pulses
The utility model discloses further preferred scheme does: the voltage range of the secondary side of the isolation transformer is [1,30] KV.
To sum up, the utility model discloses following beneficial effect has: can will melt the target area through the sectional type electrode and refine, can obtain regional impedance and form the impedance map that melts the target area, make things convenient for the audio-visual observation of operating personnel to melt the target area internal impedance distribution condition through the impedance map, when melting through the sectional type electrode, can realize melting regional more meticulous operation simultaneously.
Drawings
FIG. 1 is a schematic view of the structure of the segmented electrode needle described in example 1.
Fig. 2 is a cross-sectional view at a-a in fig. 1.
FIG. 3 is a sectional view in the axial direction of the segmented electrode needle described in example 1.
Fig. 4 is a block diagram showing the configuration of the impedance measuring device and the ablation apparatus according to embodiment 2.
Wherein:
100. a needle body; 200. a conductive portion; 300. a wire; 400. a needle core; 410. a needle tip;
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1:
as shown in fig. 1 to 3, the present embodiment provides a segmented electrode needle, which includes an insulating needle body 100, a conductive portion 200 disposed on an end surface of the needle body 100, and conductive wires 300 embedded in the needle body 100, wherein the conductive wires 300 are connected to the conductive portion 200 in a one-to-one correspondence. The number of the conductive parts 200 is at least three, and the conductive parts 200 are sequentially arranged along the surface of the needle body 100 in an axial and equidistant manner, that is, the distance between two adjacent conductive parts 200 is equal.
In the present embodiment, the conductive portion 200 is a conductive ring, and six conductive rings and six conductive wires 300 are provided. The conducting ring is embedded in the surface of the needle body 100 to a certain depth, and the exposed surface of the conducting ring is flush with the surface of the needle body 100, so that the visual sense consistency of the outer side wall of the electrode needle is maintained. The widths of the six conducting rings are equal, and the distances between the adjacent conducting rings are equal.
In order to maintain a certain flexibility of the electrode needle, a needle core 400 for supporting the needle body 100 is further provided in the needle body 100. The needle core 400 is located at the axial center of the needle body 100, and the end of the needle core 400 is exposed out of the needle body 100 and forms a needle point 410. The conducting wire 300 is uniformly distributed on the inner circumference of the needle body 100 with the needle core 400 as the center, and the conducting wire 300 is positioned between the needle core 400 and the conducting ring. The wires 300 extend from the end of the electrode needle to the tip 410 of the head end and are bent outward one by one on the way to be connected to the conductive rings on the surface of the needle body 100 one by one.
Example 2:
as shown in fig. 4, the present embodiment provides an impedance measuring device and an ablation apparatus using the same. The impedance measuring device comprises at least one pair of segmented electrode needles as described in any one of embodiment 1, a detection circuit connected with the segmented electrode needles, and a display screen for displaying impedance distribution.
In this embodiment, the detection circuit mainly includes a voltage reference circuit, a high-voltage switch array circuit, a current sampling circuit, and a control circuit.
And the voltage reference circuit is used for generating pulse voltage and rapidly conducting the conducting rings (on the pair of electrode needles) one by one through the pulse voltage. The voltage reference circuit comprises a direct current power supply, a switch driving circuit, a thyristor circuit, an energy storage circuit and an isolation transformer. The direct current power supply provides a first direct current voltage for the thyristor circuit, the driving circuit is controlled by the control circuit to control the on-off of the thyristor circuit to modulate the first direct current voltage into a nanosecond pulse voltage or a microsecond pulse voltage with a required wavelength, the nanosecond pulse voltage or the microsecond pulse voltage is connected with the primary side of the isolation transformer through the energy storage circuit, and the voltage is boosted to a required reference voltage through the isolation transformer. And finally, calculating to obtain the corresponding impedance.
It should be noted that, when the nanosecond pulse and the microsecond pulse are used as the reference voltages, the voltage values corresponding to the nanosecond pulse and the microsecond pulse are different. In order to allow the detected reference voltage to be compatible with nanosecond pulses or microsecond pulses, in specific implementation, the dc power supply of the voltage reference circuit is a high-voltage adjustable dc power supply. When the microsecond pulse voltage is modulated, the high-voltage adjustable direct current selects a first voltage; the high voltage adjustable dc selects the second voltage when modulating the nanosecond pulsed voltage.
And the high-voltage switch array circuit comprises a plurality of high-voltage relays, and the high-voltage relays are in one-to-one correspondence with the conducting wires and are connected with the conducting part so as to be connected with the voltage reference circuit. The high-voltage relay is controlled by a control circuit, the reference circuit and one pair of conducting parts are switched on only in corresponding time periods, one conducting part receives a rectangular wave in the period of receiving detection, the other conducting part is grounded in the period of receiving detection, the current of the ablation target area in the period of switching on the conducting parts is obtained through the short conduction of the two conducting parts in the period of receiving detection, the impedance is calculated, and the rest high-voltage relays are kept in an off state in the period.
And the current sampling circuit is connected in series on the conductive part and is used for collecting the current of the conductive part when the conductive part is conducted. In this embodiment, the current sampling end of the current sampling circuit is disposed on the secondary side of the isolation transformer, and after sampling, the current sampling end is amplified and filtered through shaping, and then is connected to the main control board of the control circuit through the a/D converter.
And the display screen is connected with the PLC of the control circuit through a display screen driving circuit and is used for displaying the image of the ablation target area through the color and the brightness of pixels according to the detected impedance value and forming an impedance map of the ablation target area.
And the control circuit is used for controlling the voltage reference circuit to modulate pulse voltage, controlling the on-off of a high-voltage relay in the high-voltage switch array circuit, receiving the current acquired by the current sampling circuit, calculating an impedance value, and converting the impedance value into a graph or an image so as to be displayed on the display screen.
In this embodiment, to simplify the circuitry, the same circuit is used to modulate the reference voltage for detecting the impedance and to modulate the voltage for ablating the high voltage pulse. Meanwhile, in order to enable the ablation equipment to have the functions of microsecond pulses and nanosecond pulses, two groups of switch driving circuits, thyristor circuits, energy storage circuits and isolation transformers are respectively arranged and are commonly connected with a high-voltage adjustable direct-current power supply, the high-voltage adjustable direct-current power supply is adjusted to four different voltage intervals, the four pulses with different voltages are output by matching the switch driving circuits, the thyristor circuits, the energy storage circuits and the isolation transformers, and the four voltages are respectively and correspondingly used for detecting impedance microsecond pulses and nanosecond pulses and microsecond pulses for ablation.
Specifically, the thyristor of the switch driving circuit I, SiC, the energy storage circuit I and the isolation transformer I cooperate with the high-voltage adjustable direct-current power supply to output microsecond pulses, and the secondary side of the isolation transformer I is connected with the segmented electrode through the high-voltage switch array I. The switch driving circuit II, the thyristor selection circuit, the energy storage circuit II and the isolation transformer II are matched with the high-voltage adjustable direct-current power supply to output nanosecond pulses, and the secondary side of the isolation transformer II is connected with the sectional type electrode through the high-voltage switch array II. The thyristor selection circuit is formed by connecting a plurality of thyristors with different parameter models in parallel and connecting switches in series, when in use, the switch corresponding to one of the thyristors is selected to be closed, so that the thyristors are connected into the circuit, and the nanosecond pulses without wavelengths are modulated by selecting the thyristors with different parameters and models.
The utility model discloses specific use as follows:
before impedance is measured by microsecond pulse, a pair of sectional electrode needles are inserted into preset positions of an ablation target area, the sectional electrode needles are kept parallel as far as possible, conductive parts on the two sectional electrode needles are opposite to each other, leads of the sectional electrode needles are connected with switches in a high-voltage array switch I one by one, a control circuit sends a modulation signal to a switch driving circuit I, microsecond pulse is generated on the secondary side of an isolation transformer I, at the moment, two groups of switches in the high-voltage array switch I are closed one by one simultaneously, and one pulse is ensured to pass through a pair of conductive parts.
For ease of understanding, the impedance detection is described. A section of microsecond pulse generated by the secondary side of the isolation transformer I comprises 16 rectangular waves with the serial numbers of 1-16, and by controlling the on-off of the high-voltage array switch I, only one pair of conducting parts is controlled to be connected each time, so that the current between the conducting parts is obtained, and the impedance is calculated.
And finally, forming an impedance map of the ablation target area through the impedance data.
Claims (7)
1. The sectional type electrode needle is characterized by comprising an insulating needle body, a conductive part arranged on the end surface of the needle body and a lead embedded in the needle body, wherein the lead is used for connecting the conductive part; the electrically conductive part is equipped with three at least, the electrically conductive part is followed the needle body surface sets up to axial equidistance in proper order.
2. The segmented electrode needle of claim 1, wherein the conductive portion is a conductive ring embedded in a surface of the needle body.
3. The segmented electrode needle of claim 2, wherein the conductive rings are all equal in width and are all equal in spacing between adjacent conductive rings.
4. The segmented electrode needle of claim 1, further comprising a hub disposed within the needle body for supporting the needle body.
5. The segmented electrode needle according to claim 4, wherein the needle core is located at the axial center of the needle body, and the conducting wires are uniformly distributed on the inner circumference of the needle body by taking the needle core as a center; the end part of the needle core is exposed out of the needle body and forms a needle point.
6. An impedance measuring device comprising at least one pair of segmented electrode needles according to any one of claims 1 to 5, and a sensing circuit connected to said segmented electrode needles; the detection circuit includes:
a voltage reference circuit for generating a pulse voltage;
the high-voltage switch array circuit comprises a plurality of high-voltage relays, and the high-voltage relays are in one-to-one correspondence with the conducting wires and are connected with the conducting parts so as to be connected with the voltage reference circuit;
the current sampling circuit is connected in series on the conductive part and is used for collecting the current of the conductive part when the conductive part is conducted; and
and the control circuit is used for controlling the voltage reference circuit to modulate pulse voltage, controlling the on-off of a high-voltage relay in the high-voltage switch array circuit, receiving the current magnitude acquired by the current sampling circuit and calculating an impedance value.
7. The impedance measuring device according to claim 6, further comprising a display screen connected to the control circuit for displaying the detected impedance value on the image of the ablation target area by the color and shading of the pixels and forming an impedance map of the ablation target area.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022220604.0U CN214259459U (en) | 2020-09-30 | 2020-09-30 | Sectional type electrode needle and impedance measuring device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202022220604.0U CN214259459U (en) | 2020-09-30 | 2020-09-30 | Sectional type electrode needle and impedance measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116531083A (en) * | 2023-06-30 | 2023-08-04 | 上海安钛克医疗科技有限公司 | Pulse ablation system |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116531083A (en) * | 2023-06-30 | 2023-08-04 | 上海安钛克医疗科技有限公司 | Pulse ablation system |
| CN116531083B (en) * | 2023-06-30 | 2023-09-22 | 上海安钛克医疗科技有限公司 | Pulse ablation system |
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