CN117017256A - Intracranial pressure monitor by open type ventricular catheter method - Google Patents
Intracranial pressure monitor by open type ventricular catheter method Download PDFInfo
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Abstract
An intracranial pressure monitor by an open type ventricular catheter method is characterized by comprising an adapter wire library matched with intracranial pressure sensor ends of various brands, a universal signal acquisition and sensor end power supply module, a computer and an intracranial pressure monitoring program running on the computer; the universal signal acquisition and sensor end power supply module, the computer and the intracranial pressure monitoring program running on the same can be combined into an embedded instrument whole to realize the conditioning, acquisition, calculation, display and storage of intracranial pressure signals, and meanwhile, the sensor end is powered by an adapter wire matched with each brand of intracranial pressure sensor end. The monitor can furthest realize the sharing of the intracranial pressure monitor body, so that hospitals do not need to be equipped with various intracranial pressure monitors of other brands, the equipment cost of the hospitals is reduced, and the time for preparing intracranial operations is reduced.
Description
Technical Field
The application relates to an intracranial pressure (Intracranial Pressure, ICP) monitor by an open type ventricular catheter method.
The intracranial pressure monitor is clinically suitable for hydrocephalus, cerebral edema, intracranial hemorrhage, cerebral ventricular meningitis, tuberculous meningitis, intracranial space occupying lesion, cerebral operation or cerebral trauma, cerebrospinal fluid hypersecretion circulation or absorption disorder, and the like, and is used for controlling cerebral fluid drainage decompression, intracranial high-pressure crisis or hydrocephalus and the like when the cerebral high-pressure is used for intracranial decompression, the cerebral ventricular meningitis needs local injection treatment and the like.
Intraventricular catheterization is the most commonly used method of intracranial pressure monitoring in the clinic. The puncture of the anterior horn of the lateral ventricle is carried out, one end of a catheter provided with a probe is arranged in the anterior horn of the lateral ventricle, and the other end of the catheter is respectively connected with an intracranial pressure monitoring instrument body and a ventricular drainage bottle through a three-way pipe. The intracranial catheter method, which is applied in an invasive scene, is more accurate and reliable in intracranial pressure monitoring value than other methods, and is called a gold standard method of ICP monitoring.
The intracranial pressure monitor by the complete ventricular catheter method comprises two parts, namely an intracranial pressure monitoring probe (or called a sensor) and a monitor body. The narrow-sense intracranial pressure monitor by an intra-ventricular catheter method does not comprise a probe, and only refers to an instrument part for monitoring the intracranial pressure outside the probe, namely an intracranial pressure monitor body; the application discloses an intracranial pressure monitor by an open type ventricular catheter method, which is a narrow intracranial pressure monitor body, and does not comprise an intracranial pressure monitoring probe part. By "open" it is meant that it can be used with a wide variety of brands of intracranial pressure monitoring probes.
Background
The current intracranial pressure monitor products by the ventricular catheter method have a plurality of brands, such as: codman Neuro (Integra LifeSciences), medtronic, RAUMEDIC AG, SOPHYSA, spiegelberg GmbH & Co.KG, natus Medical Incorporated, gaeltec Devices Ltd, neural analysis, etc. The brand products all form a complete intracranial pressure monitor by an intra-ventricular catheter method, and the intracranial pressure monitor comprises an intracranial pressure monitoring probe and a monitor body, is self-closed, and is only matched with the monitor body, and the probe of any brand product can not be matched with the monitor body of any other brand product for use. Fig. 2 (a) is a schematic diagram of the probe section interface of the Codman brand product and fig. 2 (b) is a schematic diagram of the probe section interface of the sophssa brand product, it being apparent that their interfaces are different and are not interchangeable when mated with the monitor body section.
This lack of interchangeability can be inconvenient in clinical applications. The expression is as follows: (1) The probes are all disposable, and on the premise of selecting the brand of the probes to respect the patient as much as possible, the hospital needs to be provided with various brands of intracranial pressure monitoring instruments to meet the needs of the patient, which is a burden to the hospital; (2) If two patients receiving surgery choose different brands of intracranial pressure monitoring probes, the brand-mismatched intracranial pressure monitor body mounted on the operating table needs to be replaced, which is a nuisance to the preparation of surgery.
How do intra-ventricular catheter intracranial pressure monitor products have interchangeability? The intracranial pressure monitoring probe is disposable, and a new probe is necessary to be replaced every time of operation, so that the interchangeability mainly refers to how the intracranial pressure monitoring probe body can be replaced as much as possible, and the application needs to be an open type intracranial pressure monitoring probe body which can be matched with any brand of intracranial pressure monitoring probe. There is currently no such open, non-self-sealing intracranial pressure monitor body.
The difficulties in realizing an open intracranial pressure monitor are: (1) The sizes, the pin numbers and the distribution rules of interfaces between the probe end and the monitor end of the intracranial pressure monitor products of different brands are different, namely the mechanical characteristics of the physical layer are different; (2) The functional definition of probes of different brands of intracranial pressure monitor products and the interface pins of the monitors are different; (3) The functional definition of the probe and the interface pin of the monitor is not disclosed by each brand of product, and the product is a black box for users; (4) The principle of intracranial pressure monitors by means of intraventricular catheters is not known to the skilled person.
Disclosure of Invention
Object of the Invention
The technical scheme of the intracranial pressure monitor by the open type ventricular catheter method is provided, so that the intracranial pressure monitor body is shared, and the intracranial pressure monitor is compatible with the use of probes of various brands of intracranial pressure monitors.
Technical proposal
An open-type intra-ventricular catheter-based intracranial pressure monitor, comprising (1) a monitor comprising: the system comprises an adapter wire library matched with each brand of intracranial pressure sensor end, a general signal acquisition and sensor end power supply module, a computer and an intracranial pressure monitoring program running on the adapter wire library; (2) The universal signal acquisition and sensor end power supply module supplies power to the intracranial pressure sensor in the form of an electric bridge through a matched patch cord, and simultaneously conditions and acquires one path of voltage signal which is output by the electric bridge at the sensor end and reflects the intracranial pressure, so that the digitization of the voltage signal is realized; (3) The computer is communicated with a general signal acquisition and sensor end power supply module, the general signal acquisition and sensor end power supply module transmits acquired voltage signal data to the computer for further processing through USB, WIFI, bluetooth or other communication protocols, intracranial pressure is calculated, displayed and stored in real time, and filtering operation with large time delay is not used in calculation; (4) The universal signal acquisition and sensor end power supply module can be powered by a computer through USB or can be independently powered by another power supply; (5) The universal signal acquisition and sensor end power supply module, the computer and the intracranial pressure monitoring program running on the universal signal acquisition and sensor end power supply module can be combined into an embedded instrument whole to realize the conditioning, acquisition, calculation, display and storage of intracranial pressure signals, and meanwhile, the sensor end is powered by an adapter wire matched with each brand of intracranial pressure sensor end. See fig. 1.
According to the above-mentioned intracranial pressure monitor by the open type ventricular catheter method, if it is desired to support a certain brand of intracranial pressure sensor, it is necessary to identify the interface between the end of the brand of intracranial pressure sensor and the body end of the monitoring instrument, so as to make the patch cord of the open type monitor matched with the brand of intracranial pressure sensor, and the application is characterized in that (1) the number of pins necessary for the interface between the open type monitor and the body of the monitoring instrument is 4, wherein 1 pair is used for supplying power to the bridge, 1 pair is used for outputting voltage signals of the bridge, but the number of pins of the sensor and the rear end interface is more than 4 (if other pins are used for monitoring temperature or reading sensor identification codes) for various reasons; (2) The method for identifying the 4 necessary pins of the interface of the intracranial pressure sensor of the brand is that the instrument body of the intracranial pressure monitor of the brand is opened (electrified), the sensor is not connected first, 2 pins which are best found in the instrument interface and are used for supplying power to the sensor bridge are detected first by a universal meter, an oscilloscope or other collectors, the voltage between the two pins is 5V or a certain whole direct current voltage, the two pins possibly serve as 2 pins for supplying power to the sensor, the other 2 pins nearby are extremely likely to serve as 2 pins for receiving output signals of the bridge, in addition, the sensor end corresponds to the 4 pins of the bridge, the resistances between any two pins are approximately equal, 4 necessary bridge pins can be initially identified based on the characteristics, an adapter wire matched with the sensor can be manufactured according to the characteristics, if the open type monitor can normally monitor the change of the pressure signal, the identified 4 necessary pins of the intracranial pressure interface can be confirmed to be correct, otherwise, the open type monitor is continued until the pressure signal and the change thereof can be normally detected.
According to the above-mentioned open type intracranial pressure monitor by using the ventricular catheter method, if the monitor is to support a certain brand of intracranial pressure sensor, not only a correct adapter wire matched with the sensor is needed, but also the brand of intracranial pressure sensor is required to be calibrated, and the monitor is characterized in that (1) the brand of intracranial pressure sensor is connected with the body of the open type intracranial pressure monitor by using the matched adapter wire; (2) The catheter with the built-in brand probe is stuck on a ruler with scales by using an adhesive tape; (3) The graduated ruler with the guide pipe is vertically and downwards stretched into a measuring cup containing enough water, and the voltage value output by the corresponding sensor end bridge is recorded by the monitor under different depths of stretching into water, so that the calibration can be realized, and the value of 1 depth stretching into water corresponds to the value of 1 relative pressure value. See fig. 6, 7, 8, 9 and 10.
According to the above-mentioned intracranial pressure monitor by the open type intraventricular catheter method, if a calibration file of a certain brand sensor exists, a corresponding calculation formula y=a×x+b of intracranial pressure is provided, wherein y is calculated intracranial pressure, x is a monitored voltage value, a and b are conversion parameters obtained by the calibration file, but in actual intracranial pressure monitoring, because of individual differences of the sensors and differences of monitoring environmental parameters due to temperature and the like, zero setting operation is also needed, and the intracranial pressure monitor is characterized in that (1) a probe is placed on a water level of a water container, namely, the output voltage is monitored under 0 relative pressure, the pressure is calculated by using the formula y=a×x+b, and a certain error exists between the calculated pressure and an ideal value 0; (2) The zero setting is to record an error value at 0 relative pressure and to subtract the error value for elimination at the time of the following formal monitoring.
According to the above-mentioned open type intracranial pressure monitor by using the ventricular catheter method, in order to better realize the comparison of the monitoring precision with the intracranial pressure monitor by using the ventricular catheter method of other brands, a three-way patch cord can be manufactured for simultaneous monitoring of the open type monitor and other brands of monitors, and is characterized in that (1) the three-way patch cord is provided with an interface communicated with an intracranial pressure sensor end of a brand, an interface communicated with a body of the intracranial pressure monitor of the brand and an interface communicated with the intracranial pressure monitor of the open type; (2) The definition of the three-way patch cord and the interface of the brand intracranial pressure monitor body for comparison is unchanged, and the interface of the three-way patch cord and the developed intracranial pressure monitor can be connected with only two wires related to the voltage output of the bridge at the sensor end without connecting a power wire and a ground wire.
The technical proposal firstly has the difficulty that the intracranial pressure monitor of the catheter method in ventricles of various brands is closed and is a black box, and two points are needed to be considered from the technical comprehensiveness of culture for many years and spider silk horse marks: (1) These brands of products may be based on piezoresistive sensors at the sensor end to measure intracranial pressure, i.e., based on the fact that changes in intracranial pressure cause changes in the resistance of the sense resistor; (2) They may be bridge-connected to the sensor side to output the sensitive resistance signal. The principle of the bridge is shown in figure 3, the sensitive resistor R x As one bridge arm and the other three resistors R as the other three bridge arms, a bridge is formed; if the power supply is U I When |DeltaR x |＝|R-R x When R is < R, there are:
i.e. bridge output U o And DeltaR x Proportional to the ratio; when DeltaR x In direct proportion to pressure change, i.e. U o Proportional to the pressure change. Only if the two points are guessed, the interface between the sensor end and the intracranial pressure instrument body end can be thoughtThe necessary number of pins is 4, wherein 1 pair of pins is used for supplying power to the bridge and 1 pair of pins is used for signal output of the bridge.
Advantageous effects
Experiments were designed. The application discloses an intracranial pressure monitor by an open type ventricular catheter method, which comprises a monitor body and an adapter wire library. In-measuring-cup water pressure test experiments were performed by connecting Codman and SOPHYSA brand sensors, respectively. Before the formal test, calibration and zero setting operation are performed. Experiments show that the open intracranial pressure monitor can accurately monitor intracranial pressure, and the monitoring accuracy can be less than 0.2mmHg. Meanwhile, the open type monitor is monitored and found through the three-way connecting line and the Codman monitor, the open type monitor is high in monitoring precision, 1-bit effective number after decimal point can be reserved, and response is quicker, for example, test pressure is suddenly increased from 5mmHg to 10mmHg, the Codman monitor takes about 3 seconds to gradually increase to 10mmHg compared with the open type monitor, and the open type monitor is beneficial to the calculation of the open type monitor without using large time delay filtering operation.
As long as the pressure detection precision is ensured, the obvious characteristics and advantages of the intracranial pressure monitor by the open type ventricular catheter method are obviously as follows: the intracranial pressure monitor can furthest realize the sharing of the intracranial pressure monitor body. If the hospital is equipped with the open type monitoring instrument, various other brands of intracranial pressure monitoring instruments are not needed to be equipped, and the equipment cost of the hospital can be reduced. If the intracranial pressure monitoring probe is installed on an operating table, when two patients receiving operation select intracranial pressure monitoring probes of different brands, only one patch cord is needed to be replaced instead of putting down the whole intracranial pressure monitoring instrument body, so that the trouble of operation preparation can be reduced.
Drawings
FIG. 1 is a block diagram of the logic and components of an open-type intra-ventricular catheter-based intracranial pressure monitor according to the present application.
FIG. 2 is a schematic diagram of two brands of intracranial pressure sensor interface interfaces. a is a Codman brand and b is a SOPHYSA brand.
FIG. 3 is a schematic diagram of a sensor side bridge circuit. R is R x : a piezoresistor; r: a fixed resistor; u (U) I : a voltage; u (U) o : bridgeAnd outputting.
FIG. 4 is a schematic diagram of a Codman brand sensor end and its instrument body interface. Pins 1, 2, 3, 4 at the sensor end correspond to pins 11, 21, 31, 41 at the instrument body end, respectively. Pins 1 and 1 'are connected to the ground of the circuit, and pins 4 and 4' are connected to power +5V. 2. And 3 is respectively connected with 2 'and 3' to collect one path of bridge voltage signal. 2 and 2' are connected with the IN of the differential input of the rear end amplifying conditioning acquisition circuit + And the ends 3 and 3' are connected with the IN-end of the differential input of the rear-end amplifying conditioning acquisition circuit.
FIG. 5 is a schematic diagram of the SOPHYSA brand sensor end and its instrument body interface. Pins 1, 2, 3 and 4 at the sensor end correspond to pins 1 ', 2', 3 'and 4' at the instrument body end respectively. Pins 4 and 4 'are connected to the ground of the circuit, and pins 3 and 3' are connected to power +5V. 1. And 2 is respectively connected with 1 'and 2' to collect one path of bridge output voltage signal. 1 and 1' are connected with IN of differential input of the rear end amplifying conditioning acquisition circuit - Terminal 2 and 2' are connected with IN of differential input of rear-end amplifying conditioning acquisition circuit + And (3) an end.
FIG. 6 is a schematic illustration of the attachment of a catheter with a built-in sensor to a calibration ruler.
FIG. 7 is a schematic diagram of a calibration method for an open instrument intended to support a certain brand of intracranial pressure sensor. In the figure, 1: a measuring cup for holding sufficient water; 2: a ruler stuck with a conduit with a built-in sensor; 3: a conduit; 4: a piezoresistor; 5: a wire cable; 6: and a sensor end interface.
FIG. 8 is a schematic diagram of the complete connection of Codman brand sensors to the calibration of the open monitor.
FIG. 9 is a schematic diagram of the complete connection of SOPHYSA brand sensor to the calibration of the open monitor.
FIG. 10 is a schematic diagram of the calibration process and software interface of the open intracranial pressure monitor.
FIG. 11, codman brand sensor configuration open monitor calibration result curve.
FIG. 12, SOPHYSA brand sensor is a calibration result curve for an open monitor.
FIG. 13 is a schematic diagram of a software interface before zeroing for an open monitor of the present application.
FIG. 14 is a schematic diagram of a software interface of the open monitor of the present application after zeroing.
FIG. 15 is a schematic representation of a three-way connection for comparative monitoring of an open monitor of the present application with a Codman brand monitor.
FIG. 16 is a graphical representation of the comparison of the results of the three-way connection monitoring of the open monitor of the present application with the Codman brand monitor.
Detailed Description
Examples.
An open type intracranial pressure monitor by an intra-ventricular catheter method is prepared, which comprises an adapter wire library matched with the intracranial pressure sensor end of each brand, a universal signal acquisition and sensor end power supply module, a computer and an intracranial pressure monitoring program running on the computer; the universal signal acquisition and sensor power supply module supplies power to the intracranial pressure sensor in the form of an electric bridge through a matched patch cord, and simultaneously conditions and acquires one-path voltage signal which is output by the electric bridge and reflects the intracranial pressure, which is specifically amplified by 2000 times, and realizes signal acquisition by adopting 16-bit AD; the computer is communicated with a general signal acquisition and sensor end power supply module, the general signal acquisition and sensor end power supply module transmits acquired voltage signal data to the computer through a USB cable and a serial port protocol for further processing, intracranial pressure is calculated in real time, displayed and stored, and only low-order median filtering is used during calculation; the universal signal acquisition and sensor end power supply module is powered by a computer through USB.
If a certain brand of intracranial pressure sensor is to be supported, the interface between the brand of intracranial pressure sensor end and the monitoring instrument body end needs to be identified to manufacture an adapter wire matched with the brand of intracranial pressure sensor. An intracranial pressure sensor in the form of a bridge having 4 pins necessary to interface with the monitor body, 1 pair for powering the bridge, 1 pair for voltage signal output of the bridge, but it is also possible for a variety of reasons that the interface has more than 4 pins (and sometimes pins for monitoring temperature or for sensor ID code communication); the method for identifying the 4 necessary pins of the brand intracranial pressure sensor interface is that the instrument body of the brand intracranial pressure monitor (namely, electrifying) is opened, the sensor is not connected first, the 2 pins which are best found in the instrument interface and are used for supplying power to the sensor bridge are detected by a universal meter, an oscilloscope or other collectors, the voltage between the two pins is 5V or a certain whole direct current voltage, the two pins possibly supply power to the sensor, the other 2 pins nearby are possibly two pins for receiving the output signals of the bridge, in addition, the sensor end corresponds to the 4 pins of the bridge, the resistances between any two pins are approximately equal, 4 necessary bridge pins can be initially identified based on the characteristics, and an adapter wire matched with the sensor is manufactured, if the manufactured adapter wire is matched with the open type monitor, the accuracy of the identification of the 4 necessary pins of the intracranial pressure interface can be confirmed, otherwise, the method continues to explore until the body of the universal type monitor which is manufactured and is matched with the corresponding adapter wire can detect the pressure value and the change of the pressure value, and the change of the body of the bridge can be detected, so that the accuracy of the instrument can be determined by the sensor end is detected. The definition of the interfaces of the Codman and SOPHYSA brand intracranial pressure sensors, respectively, has been correctly judged according to this scheme, as shown in FIGS. 4 and 5.
If the intracranial pressure monitor by the open type ventricular catheter method is to support a certain brand of intracranial pressure sensor, not only a correct patch cord matched with the intracranial pressure sensor is needed, but also calibration is needed for the brand of intracranial pressure sensor. The brand intracranial pressure sensor is connected with the intracranial pressure monitor by the open type ventricular catheter method through a matched patch cord; sticking the catheter with the built-in brand probe on a ruler with scales by using an adhesive tape; the graduated ruler with the guide pipe is vertically and downwards stretched into a measuring cup containing enough water, voltage values output by a corresponding sensor end bridge are recorded under different depths of stretched water, and calibration can be achieved, and 1 depth value of stretched water corresponds to 1 relative pressure value. According to the scheme, calibration is carried out when the open type monitor body is assembled on Codman and SOPHYSA brand sensors respectively. The adhesion of the intracranial pressure catheter, probe and ruler is shown in figure 6. A schematic diagram of the extension of the catheter probe ruler into the water cup during calibration is shown in FIG. 7. The complete connection of the Codman and SOPHYSA brand sensors to the calibration of the open monitor is shown in FIGS. 8 and 9, respectively. The calibration process and software interface are shown in FIG. 10: selecting the brand of the sensor to be calibrated, and storing the current voltage monitoring value and the intracranial pressure calibration value in pairs for a certain maintained extending water cup height; and (5) changing the pressure, and measuring the corresponding relation between the voltage and the pressure at a plurality of points, thereby completing the calibration. The resulting curves for the final calibration of both Codman and SOPHYSA brand sensors are shown in FIGS. 11 and 12.
The open type intracranial pressure monitor by using the ventricular catheter method has a calibration file of a certain brand sensor, and has a corresponding calculation formula y=a x+b of intracranial pressure, wherein y is calculated intracranial pressure, x is a monitored voltage value, a and b are conversion parameters obtained by the calibration file, a=282.501 mmH2O/V in terms of Codman conversion, b=7.50466mmH2O, a=115.207 mmH2O/V in terms of SOPHYSA conversion and b=112.074mmH2O, but in actual intracranial pressure monitoring, zero setting operation is also required due to individual difference of the sensors and also due to difference of monitoring environmental parameters such as temperature. Placing the probe at the level of the nearby water container, i.e. monitoring at 0 relative pressure, calculating the pressure with the formula y=a x+b, which may have a certain error from the ideal value 0; the zero setting is to record an error value at 0 relative pressure and to subtract the error value for elimination at the time of the following formal monitoring. Fig. 13 and 14 are schematic diagrams of software interfaces before and after zeroing of the open monitor.
In order to better realize the comparison of the monitoring precision with the intracranial pressure monitor by the ventricular catheter method of other brands, the three-way patch cord is manufactured and used for simultaneously monitoring the monitor and the monitor of other brands. The three-way patch cord is connected with a Codman intracranial pressure sensor end interface, a Codman intracranial pressure monitor body interface and an open intracranial pressure monitor interface, as shown in figure 15; the definition of the three-way patch cord and the identified interface of the Codman intracranial pressure monitor body is unchanged, the interface of the three-way patch cord and the open-type intracranial pressure monitor is only connected with two wires related to the output of a bridge at the sensor end, and the three-way patch cord and the interface of the open-type intracranial pressure monitor are not connected with a power cord and a ground cord. After the two instruments are operated for 0 and the like, the monitoring results are consistent, as shown in fig. 16.
It should be noted that: the embodiment is just an implementation example, the signal conditioning amplification factor 2000 in the implementation of the monitor is a specific multiple, the corresponding conversion coefficient in intracranial pressure calculation is also a specific value, meanwhile, the brand of the intracranial pressure sensor only selects two brands of Codman and SOPHYSA as examples to talk about the scheme of interface identification, probe calibration and zero setting and the scheme based on three-way line contrast monitoring precision, and any change of specific numerical values or specific brands in the implementation, including integrating the signal acquisition module and a computer into an embedded instrument whole, does not form a new technical scheme, and is the scope of the protection of the application.
Claims (5)
1. An open-type intra-ventricular catheter-based intracranial pressure monitor, comprising (1) a monitor comprising: the system comprises an adapter wire library matched with each brand of intracranial pressure sensor end, a general signal acquisition and sensor end power supply module, a computer and an intracranial pressure monitoring program running on the adapter wire library; (2) The universal signal acquisition and sensor end power supply module supplies power to the intracranial pressure sensor in the form of an electric bridge through a matched patch cord, and simultaneously conditions and acquires one path of voltage signal which is output by the electric bridge at the sensor end and reflects the intracranial pressure, so that the digitization of the voltage signal is realized; (3) The computer is communicated with the universal signal acquisition and sensor end power supply module, the universal signal acquisition and sensor end power supply module transmits acquired voltage signal data to the computer for further processing through USB, WIFI, bluetooth or other communication protocols, intracranial pressure is calculated, displayed and stored in real time, and filtering operation with large time delay is not used in calculation; (4) The universal signal acquisition and sensor end power supply module can be powered by a computer through USB or can be independently powered by another power supply; (5) The universal signal acquisition and sensor end power supply module, the computer and the intracranial pressure monitoring program running on the universal signal acquisition and sensor end power supply module can be combined into an embedded instrument whole to realize the conditioning, acquisition, calculation, display and storage of intracranial pressure signals, and meanwhile, the sensor end is powered by an adapter wire matched with each brand of intracranial pressure sensor end.
2. The device of claim 1, wherein if it is desired to support a certain brand of intracranial pressure sensor, it is necessary to identify the interface between the end of the brand of intracranial pressure sensor and the body end of the monitoring device, so as to make an adapter wire for matching the brand of intracranial pressure sensor with the open type monitoring device, and the device is characterized in that (1) the number of pins necessary for the interface between the open type monitoring device and the body of the monitoring device is 4, 1 pair is used for supplying power to the bridge, 1 pair is used for outputting voltage signals of the bridge, but the number of pins of the sensor and the rear end interface is more than 4 (if other pins are used for monitoring temperature or reading sensor identity code) possibly due to various reasons; (2) The method for identifying the 4 necessary pins of the interface of the intracranial pressure sensor of the brand is that the instrument body of the intracranial pressure monitor of the brand is opened (electrified), the sensor is not connected first, 2 pins which are best found in the instrument interface and are used for supplying power to the sensor bridge are detected first by a universal meter, an oscilloscope or other collectors, the voltage between the two pins is 5V or a certain whole direct current voltage, the two pins possibly serve as 2 pins for supplying power to the sensor, the other 2 pins nearby are extremely likely to serve as 2 pins for receiving output signals of the bridge, in addition, the sensor end corresponds to the 4 pins of the bridge, the resistances between any two pins are approximately equal, 4 necessary bridge pins can be initially identified based on the characteristics, an adapter wire matched with the sensor can be manufactured according to the characteristics, if the open type monitor can normally monitor the change of the pressure signal, the identified 4 necessary pins of the intracranial pressure interface can be confirmed to be correct, otherwise, the open type monitor is continued until the pressure signal and the change thereof can be normally detected.
3. The open-type intra-ventricular catheter-based intracranial pressure monitor as recited in claim 1, wherein if the monitor is to support a certain brand of the intracranial pressure sensor, not only a correct patch cord is required for matching with the sensor, but also the intracranial pressure sensor is required to be calibrated, wherein (1) the brand of the intracranial pressure sensor is connected with the body of the open-type intra-ventricular catheter-based intracranial pressure monitor through the matched patch cord; (2) The catheter with the built-in brand probe is stuck on a ruler with scales by using an adhesive tape; (3) The graduated ruler with the guide pipe is vertically and downwards stretched into a measuring cup containing enough water, and the voltage value output by the corresponding sensor end bridge is recorded by the monitor under different depths of stretching into water, so that the calibration can be realized, and the value of 1 depth stretching into water corresponds to the value of 1 relative pressure value.
4. An open-type intra-ventricular catheter intracranial pressure monitor as claimed in claim 1, wherein if there is a calibration file of a certain brand of sensor, there is a corresponding calculation formula y=a×x+b of intracranial pressure, where y is calculated intracranial pressure, x is a monitored voltage value, a and b are conversion parameters obtained from the calibration file, but in actual intracranial pressure monitoring, because of individual differences of the sensors and also differences of monitoring environmental parameters due to temperature and the like, zero setting operation is required, characterized in that (1) the probe is placed on a water level of a water container, namely, the output voltage is monitored under 0 relative pressure, the pressure is calculated by the formula y=a×x+b, and a certain error exists between the calculated pressure and an ideal value 0; (2) The zero setting is to record an error value at 0 relative pressure and to subtract the error value for elimination at the time of the following formal monitoring.
5. According to the above-mentioned open type intracranial pressure monitor by using the ventricular catheter method, in order to better realize the comparison of the monitoring precision with the intracranial pressure monitor by using the ventricular catheter method of other brands, a three-way patch cord can be manufactured for simultaneous monitoring of the open type monitor and other brands of monitors, and is characterized in that (1) the three-way patch cord is provided with an interface communicated with an intracranial pressure sensor end of a brand, an interface communicated with a body of the intracranial pressure monitor of the brand and an interface communicated with the intracranial pressure monitor of the open type; (2) The definition of the three-way patch cord and the interface of the brand intracranial pressure monitor body for comparison is unchanged, and the interface of the three-way patch cord and the developed intracranial pressure monitor can be connected with only two wires related to the voltage output of the bridge at the sensor end without connecting a power wire and a ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310836203.3A CN117017256A (en) | 2023-07-07 | 2023-07-07 | Intracranial pressure monitor by open type ventricular catheter method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310836203.3A CN117017256A (en) | 2023-07-07 | 2023-07-07 | Intracranial pressure monitor by open type ventricular catheter method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117017256A true CN117017256A (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310836203.3A Pending CN117017256A (en) | 2023-07-07 | 2023-07-07 | Intracranial pressure monitor by open type ventricular catheter method |
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| Country | Link |
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| CN (1) | CN117017256A (en) |
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2023
- 2023-07-07 CN CN202310836203.3A patent/CN117017256A/en active Pending
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