CN114452012B - Puncture operation breathing amplitude detection device and method thereof - Google Patents

The invention discloses a puncture surgery breathing amplitude detection device and a method thereof, and the puncture surgery breathing amplitude detection device comprises a shell, an annular belt and a circuit component, wherein the circuit component comprises an FPGA; an isolation shielding piece, an inner sleeve and an outer sleeve are arranged in the shell; the isolation shielding part comprises a first shielding part and a second shielding part, and the first shielding part is fixedly connected with the shell. The invention forms a variable capacitor with small area change and large capacitance value change amplitude by arranging the matching sleeves, arranging the inner sleeve and the outer sleeve which are concentric at the inner side and the outer side of the matching sleeves and adopting the isolation shielding parts to isolate the sleeves; the relative displacement between human breathing amplitude and the sleeve corresponds through the bandage, and the relative displacement between the sleeve causes the electric capacity change, causes the charging time change according to the electric capacity change again, adopts small-scale FPGA to detect this kind of weak charging time change through counting the high frequency clock, and the atmospheric pressure value that corresponds to the charging change that measures is again in visual display, and the precision is high and the area is little.

Puncture operation breathing amplitude detection device and method thereof

Technical Field

The invention relates to the technical field of medical diagnostic instruments, in particular to a puncture operation breathing amplitude detection device and a puncture operation breathing amplitude detection method.

Background

In the traditional puncture operation, a doctor needs to puncture by depending on the image of a CT/MRI (computed tomography/magnetic resonance imaging) camera and then by depending on experience in the process that a puncture needle punctures to a focus, and the accuracy depends on the experience of the doctor; with the development of the technology, a technology of assisted puncture by adopting respiratory gating begins to appear, the respiratory gating device of the existing interventional operation needs a doctor to manually record a baseline, the patient is required to hold his breath during CT/MRI scanning, the respiratory gating upper indicator lamp indicates the respiratory position of the patient during scanning is recorded, whether the respiratory position indicated by the respiratory gating is the respiratory position during scanning is judged by eyes in the operation, then puncture action is carried out at the same respiratory position, so that the puncture precision is ensured, the detection of the respiratory amplitude by the common respiratory gating device comprises detection through air pressure change, or detection through a variable capacitor and the like.

The existing breathing mode is mostly realized by adopting a plate capacitor according to variable capacitance detection, for example, CN104720810AY is a capacitance breathing wave detection device, and particularly, a plate capacitor metal sheet is adopted to move relatively to measure, but the area of the metal sheet needs to be large in the mode, otherwise, the capacitance change range is too small to cause inaccurate measurement, and the requirement on the parallelism of the metal sheet is high, otherwise, the skew can cause the linearity of capacitance change to be not high.

The method for measuring the change of the capacitance is commonly used by a singlechip timer, for example, CN103837747A is a method for measuring the change of the capacitance with high precision and easiness by using a voltage capture function of a comparator of the singlechip and measuring the change condition of the capacitance by a counter.

Disclosure of Invention

In order to solve at least one technical problem mentioned in the background art, an object of the present invention is to provide a respiratory amplitude detection apparatus for a puncture surgery and a method thereof, which are used for realizing high-precision respiratory amplitude detection through a small-area variable capacitor.

In order to achieve the purpose, the invention provides the following technical scheme:

a puncture surgery breathing amplitude detection device comprises a shell, an annular belt and a circuit assembly, wherein the circuit assembly comprises an FPGA; an isolation shielding piece, an inner sleeve and an outer sleeve are arranged in the shell; the isolation shielding part comprises a first shielding part and a second shielding part, the first shielding part is fixedly connected with the shell, the second shielding part is fixedly sleeved outside the first shielding part in a penetrating manner, a gap is formed between the first shielding part and the second shielding part, a matching sleeve is arranged in the gap, and the matching sleeve is fixedly sleeved outside the first shielding part in a penetrating manner; the inner sleeve is movably sleeved in the first shielding piece, and forms a first capacitor with the first shielding piece and the matching sleeve, and the capacitance value of the first capacitor is in direct proportion to the distance of the inner sleeve extending into the matching sleeve; the outer sleeve is movably sleeved outside the second shielding part and fixedly connected with the inner sleeve, the outer sleeve, the second shielding part and the matching sleeve form a second capacitor, the capacitance value of the second capacitor is in direct proportion to the distance of the outer sleeve sleeved in the matching sleeve, the first capacitor and the second capacitor are connected in parallel to form a variable capacitor, and the FPGA is arranged in the shell and is electrically connected with the variable capacitor; one end of the annular belt is connected with the shell, the other end of the annular belt is used for drawing the inner sleeve to move in the first shielding piece, and the inner sleeve is further provided with a resetting structure for resetting the inner sleeve; the detection device further comprises a display unit, and the display unit generates a display signal according to the capacitance value of the variable capacitor.

Compared with the prior art, the invention has the beneficial effects that: by arranging the matching sleeves, the inner side and the outer side of each matching sleeve are also provided with the inner sleeve and the outer sleeve which are concentric, and the sleeves are isolated by adopting an isolation shielding piece, so that a variable capacitor with small area change and large capacitance change amplitude is formed; the relative displacement between human breathing amplitude and the sleeve corresponds through the bandage, and the relative displacement between the sleeve causes the electric capacity change, causes the charging time change according to the electric capacity change again, adopts small-scale FPGA to detect this kind of weak charging time change through counting the high frequency clock, and the atmospheric pressure value that corresponds to the charging change that measures is again in visual display, and the precision is high and the area is little.

Compare in the relative movement mode of the flat capacitor sheetmetal among traditional parallel plate capacitor, the area that the telescopic form in one side occupy is littleer, and it is more convenient to install for the device is whole can be simplified to littleer size, promotes portable practicality, realizes spacing effect in footpath between on the other hand sleeve and the sleeve, makes can follow the axial stability accurately movable between the sleeve, guarantees the depth of parallelism, and the electric capacity change linearity is high.

The variable capacitor formed by the small-sized sleeve combination has low charging and discharging power consumption, so that the whole power consumption of the device can be very low; compared with a single chip microcomputer, the invention adopts the FPGA to detect and control the variable capacitor, can accurately capture and detect weak capacitance change, can achieve low power consumption and simultaneously ensure higher precision; and through the mode of multilayer sleeve arrangement, set up two shunt capacitance under not increasing the space and taking up, further improved holistic appearance value scope, technically alleviateed the required precision to the detecting element, and then under FPGA of high accuracy and the appearance value of great range, the capacitance change testing result that can obtain is more quick and accurate.

Furthermore, the inner sleeve, the outer sleeve and the matching sleeve are all made of conductors, and the isolation shielding piece is made of a high-dielectric-constant material such as ceramic, so that the capacitance variation range of the formed capacitor is large.

Furthermore, the inner sleeve is connected with the girdle through a pull rod, a limiting sleeve is fixedly arranged in the shell, the pull rod is movably sleeved in the limiting sleeve, one end of the pull rod is connected with the inner sleeve, and the other end of the pull rod extends out of the shell and is connected with the other end of the girdle.

Further, the reset structure is located including the cover spring on the pull rod, the one end of spring connect in the inner skleeve, the other end connect in spacing sleeve, the spring does the inner skleeve provides thrust, makes things convenient for inner skleeve and outer sleeve to reset to detect breathing amplitude continuously.

Furthermore, the display unit comprises a plurality of display lamps, the display unit controls the number of the display lamps which are switched on according to the generated display signals, and the display effect is visual.

Furthermore, a switch for controlling the FPGA to be turned on and off is arranged on the shell, so that a user can conveniently and freely control the FPGA.

A detection method of a puncture surgery breathing amplitude detection device comprises the following steps:

s101, wearing the belt on a human body, and fixing and maintaining the shell at the chest position of the human body;

s102, starting the FPGA to detect the capacitance value of the variable capacitor;

s103, the girdle expands/contracts according to the fluctuation of the chest generated by the respiration of a user, the inner sleeve and the outer sleeve are pulled to move relative to the matching sleeve, the capacitance value of the first capacitor changes due to the change of the distance of the inner sleeve extending into the matching sleeve, the capacitance value of the second capacitor changes due to the change of the distance of the outer sleeve sleeved outside the matching sleeve, and further the capacitance value of the variable capacitor changes;

s104, the FPGA detects and analyzes the capacitance value change of the variable capacitor, and generates an electric signal for controlling the display unit to work;

and S105, the display unit generates a display signal for reflecting the breathing amplitude according to the electric signal.

Further, the method of operating the circuit assembly comprises the steps of:

s201, the FPGA sets an IO port line as input, the variable capacitor connected with the IO port line starts to be charged, the FPGA starts to count a 20Mhz clock, a comparator connected with the IO port line compares and collects voltage of an I/O port, when high level is collected, the comparator overturns to trigger the FPGA counter to stop, the counter is latched at the moment to be used as a first counter, and the value is used as an initial respiration amplitude value;

s202, resetting the FPGA counter, setting an IO port line as output and low level, and starting discharging the variable capacitor;

s203, inputting an IO port line, starting counting by the FPGA, starting charging by the variable capacitor, acquiring the voltage of the I/O port by the comparator, triggering the FPGA to stop counting by the comparator in a turnover mode when a high level is acquired, and taking the latched counting value as a second counter value;

s204, the FPGA compares the numerical values of the first counter and the second counter, and if the numerical values are not consistent, the breathing amplitude is changed;

s205, the FPGA updates the current amplitude value, the second counter value is taken as the current respiration amplitude, and the first counter value is updated to be the second counter value;

and S206, according to the current amplitude value, the FPGA generates an electric signal for controlling the display lamp to be lightened.

Furthermore, still be equipped with the bellows, the bellows cover is located the outside of pull rod, the one end of bellows connect in the casing, the other end connect in the clitellum forms the protection to the pull rod parcel, and promotes the aesthetic feeling.

Furthermore, the clitellum includes the bandage and is used for adjusting the magic area of clitellum length, the quantity of magic area is two and is fixed in respectively the both ends of bandage, conveniently adjust the elasticity in order to be applicable to the user of different statures.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the interior of the housing of FIG. 1;

FIG. 3 is a schematic structural diagram of the variable capacitor portion of FIG. 2;

FIG. 4 is an enlarged view of A in FIG. 3;

FIG. 5 is a schematic cross-sectional view of FIG. 3;

fig. 6 is an enlarged schematic view of B in fig. 5.

In the figure: 1. a housing; 11. fixing the needle seat; 2. a girdle; 21. a pull rod; 22. a limiting sleeve; 31. an inner sleeve; 32a, a first shield; 32b, a second shield; 33. fitting the sleeve; 34. an outer sleeve; 4. a spring; 51. a switch; 52. a display lamp; 6. a bellows.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and fig. 2, the present embodiment provides a puncture operation breath amplitude detection device, including an annular band 2 and a casing 1 composed of an upper casing and a lower casing, where a receiving space is provided in the casing 1, a circuit module is installed in the receiving space, the circuit module includes a PCB board, an FPGA and a power supply, and the FPGA in the present embodiment is an AGL030 available from a microchip company.

It needs to be supplemented that the girdle 2 comprises a bandage and magic belts, the number of the magic belts is two and the magic belts are respectively fixed at two ends of the bandage, the magic belts can form an annular closed loop for being stuck on a human body, and the tightness of the girdle 2 can be adjusted, so that the girdle 2 can better surround and be attached to the breast of a user and can accurately follow the fluctuation of the breast to expand/contract.

Specifically, the detection method of the puncture surgery breathing amplitude detection device comprises the following steps:

s101, encircling a bandage on a human body, and adjusting the girdle 2 to a proper tightness position through a magic tape so as to fix and maintain the shell at the chest position of the human body;

s104, the FPGA detects capacitance value signals of the increased and decreased variable capacitors, and the capacitance value signals are analyzed and processed to generate electric signals for controlling the display lamps to be turned on;

In the operation of the circuit component, the FPGA firstly sets the IO port as low voltage, the variable capacitor discharges to low voltage, the FPGA counter is reset, then the FPGA sets the IO port as an input charging state, the FPGA starts counting, the power supply of the PCB charges the variable capacitor through the resistor, when the voltage of the variable capacitor rises to a certain threshold value, the comparator is triggered to turn over, the turning over event triggers the FPGA to stop counting, and then a charging time counting value corresponding to the rising time can be obtained, the charging time is in proportional relation with the capacitance value of the variable capacitor, the capacitance value of the capacitor is also in proportional relation with the expansion of the motion mechanism, the expansion of the motion mechanism is in proportional relation with the respiration amplitude of the human body, therefore, the FPGA can obtain the respiration amplitude of the human body through the obtained counting value.

Specifically, the operation method of the circuit assembly includes the following steps:

s201, an IO port line is set as an input by the FPGA, the variable capacitor connected with the IO port line starts to be charged, the FPGA starts to count a 20Mhz clock, a comparator connected with the IO port line compares the voltage of an I/O port, when a high level is collected, the comparator overturns to trigger the FPGA counter to stop, the counter is latched to serve as a first counter at the moment, and the value serves as an initial respiration amplitude value;

s202, resetting the FPGA counter, setting an IO port line as output and low level, and starting discharging the variable capacitor;

s203, inputting an IO port line, starting counting by the FPGA, starting charging by the variable capacitor, acquiring the voltage of the I/O port by the comparator, triggering the FPGA to stop counting by the comparator in a turnover mode when acquiring a high level, and taking a latched counting value as a second counter value;

s204, the FPGA compares the numerical values of the first counter and the second counter, and if the numerical values are not consistent, the breathing amplitude is changed;

s205, the FPGA updates the current amplitude value, the second counter value is taken as the current respiration amplitude, and the first counter value is updated to be the second counter value;

and S206, according to the current amplitude value, the FPGA generates an electric signal for controlling the display lamp to be lightened.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.