CN104161513A - Minimally-invasive inflatable type rectum impedance characteristic detecting device - Google Patents

Abstract

The invention discloses a minimally invasive inflatable rectal electrical impedance characteristic detection device, which belongs to the technical field of medical devices. The device includes an endoscope, an internal air bag, a detection electrode, a pressure sensor, and a signal generation and acquisition device. The endoscope is used to realize positioning and initially check the situation in the rectum; the detection electrode is used to send stimulating electrical signals and receive rectal inner wall tissue For the returned electrical signal, the pressure sensor is used to feed back the pressure of the internal airbag in contact with the inner wall of the rectum; the signal generation and acquisition device is used to generate and receive electrical stimulation signals, and process the signals accordingly; the internal airbag is set on the endoscope, The endoscope is inflated through the external inflation device, so that the internal air bag on the endoscope is inflated, and the detection electrodes and pressure sensors installed on the endoscope are in close contact with the inner wall of the rectum. The device can reflect the slight changes of rectal tissue lesions and detect the lesion in time; by measuring the rectal resistance to judge whether the rectum is abnormal, and performing three-dimensional imaging, it can provide a scientific basis for tumor location before and during surgery in confirmed cases.

Description

A minimally invasive inflatable rectal electrical impedance characteristic detection device

technical field

The invention belongs to the technical field of medical devices and relates to a minimally invasive inflatable rectal electrical impedance characteristic detection device.

Background technique

Rectal cancer refers to cancer located between the dentate line and the junction of the sigmoid colon and rectum. It is a common malignant tumor in the gastrointestinal tract, and its incidence rate is second only to gastric and esophageal cancer. It is the most common type of colorectal cancer (accounting for about 60%). The vast majority of genetic patients are over 40 years old and under 30 years old, about 15% are males, and the ratio of male to female is 2-3:1. Rectal cancer is a lifestyle disease. At present, it has jumped to the second place in the cancer rankings.

Rectal cancer is often asymptomatic or non-specific in clinical early stage, so patients and first-time doctors often do not pay attention to it, and the detection technology of rectal cancer is also very complicated. Electrical impedance imaging is a means to reconstruct the internal impedance distribution only by measuring on the surface of the object. It creates an electric field by injecting current into a target area and then measures the resulting voltage around the target. In traditional electrical impedance tomography, the placement of electrodes is usually limited to a certain plane. However, electrical impedance imaging is essentially a three-dimensional problem, and its current is not limited to flow on a certain plane. Therefore, two-dimensional image reconstruction is usually Artifacts will be produced. The main problem of 3D electrical impedance imaging is that the system cannot afford complex algorithms, and the pathological nature makes the algorithm sometimes difficult to implement, especially in the edge area, which eventually makes it difficult to judge the target position or distort the shape in the reconstructed image. The open electrical impedance imaging system can well realize the determination of the surface impedance of the object, but due to the factors of the detection depth, the accuracy can only be guaranteed within the range of 2 to 3 centimeters.

In view of the above problems, the present invention proposes a cross-planar electrode array system, which can more effectively construct a 3D imaging model through interleaved 2D plane measurement data, and reduces the cost of direct 3D reconstruction on the premise of ensuring effective accuracy. Calculations.

Contents of the invention

In view of this, the object of the present invention is to provide a minimally invasive inflatable rectal electrical impedance characteristic detection device, which can judge whether the rectum is abnormal by measuring the rectal resistance value, and perform three-dimensional imaging, which can be used for resection of confirmed cases before and during surgery. provide a scientific basis for tumor localization.

To achieve the above object, the present invention provides the following technical solutions:

A minimally invasive inflatable rectal electrical impedance characteristic detection device, the device includes an endoscope, an internal air bag, a detection electrode, a pressure sensor, a signal generation and collection device, and the endoscope is used to realize positioning and initially check the situation in the rectum ;The detection electrode and the pressure sensor are fixedly installed on the outer surface of the endoscope, the detection electrode is used to send stimulating electrical signals and receive the electrical signals returned by the rectal inner wall tissue, and the pressure sensor is used to feedback the pressure of the internal air bag in contact with the rectal inner wall; the signal occurs And the acquisition device is used to generate and receive electrical stimulation signals, and process the signals accordingly; the internal airbag is set on the endoscope, and the external inflation device inflates the endoscope, so that the internal airbag on the endoscope is inflated, Realize that the detection electrodes and pressure sensors installed on the endoscope are in close contact with the inner wall of the rectum.

Further, the signal generation and acquisition device is installed inside the endoscope, including a multi-frequency constant current module, an electrode gating module, a signal processing module, and an imaging data acquisition and communication module; the multi-frequency constant current module is used to generate signals of different frequencies Sinusoidal waveform, and achieve constant current output, and generate demodulated carrier signal synchronized with the excitation signal; the electrode gating module is mainly used to control the current signal injection and voltage signal measurement; the signal processing module is used to process the electrical signal to obtain the available The imaging data; the imaging data acquisition and communication module completes the acquisition of the DC level, and transmits the acquired imaging data to the computer for imaging.

Further, the internal airbag is made of a silicone rubber film with good flexibility and harmless to the human body, and is inflated into the endoscope tube through an external inflation device, and the gas is injected into the endoscope tube through the small hole on the endoscope tube wall. Attached to the internal air bag on the outside of the endoscope to inflate it, and deflate it through the external inflation device when the measurement is completed, so that the internal air bag returns to normal.

Further, the external inflatable device adopts an external inflatable airbag, and when the measurement is completed, the gas can be released by simply pulling out the external inflatable airbag.

Furthermore, the pressure sensor is used to feed back the pressure of the contact between the internal air bag and the inner wall of the rectum, and adjust the inflation amount of the internal air bag according to the pressure data fed back, so as to realize adaptive control for different sizes of intestinal lumens.

Further, the pressure sensor adopts medical silicon miniature pressure sensor.

The beneficial effects of the present invention are: the present invention provides a minimally invasive inflatable rectal electrical impedance characteristic detection device, which realizes the close contact between detection electrodes and other devices and the inner wall of the rectum through the internal air bag, and can reflect the microscopic changes of rectal tissue lesions. Changes, timely detection of lesions. The device judges whether the rectum is abnormal by measuring the resistance value of the rectum, and performs three-dimensional imaging, which can provide a scientific basis for tumor localization before and during surgery in confirmed cases.

Description of drawings

In order to make the purpose, technical scheme and beneficial effect of the present invention clearer, the present invention provides the following drawings for illustration:

Fig. 1 is the structural representation of device described in the present invention;

Fig. 2 is a schematic diagram of the measurement process of the device of the present invention;

Fig. 3 is a schematic diagram of an airbag inflation feedback process in an embodiment;

Fig. 4 is a schematic diagram of a detection electrode and a pressure sensor.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of the device of the present invention. As shown in the figure, the minimally invasive rectal electrical impedance characteristic detection device provided by the present invention includes an endoscope, an internal air bag, a detection electrode, a pressure sensor, a signal generation and acquisition device, and an internal The speculum is used to achieve positioning and initially check the situation in the rectum; the detection electrodes and pressure sensors are fixedly installed on the outer surface of the endoscope, the detection electrodes are used to send stimulating electrical signals and receive electrical signals returned by the rectal inner wall tissue, and the pressure sensors are used to Feedback the pressure of the internal airbag in contact with the inner wall of the rectum; the signal generation and acquisition device is used to generate and receive electrical stimulation signals, and process the signals accordingly; the internal airbag is set on the endoscope, and the endoscope is inflated through the external inflation device , so that the internal air bag on the endoscope is inflated, and the detection electrodes and pressure sensors installed on the endoscope are in close contact with the inner wall of the rectum.

In this embodiment, the signal generation and acquisition device is installed inside the endoscope, including a multi-frequency constant current module, an electrode gating module, a signal processing module, and an imaging data acquisition and communication module; the multi-frequency constant current module is used to generate different Frequency sine waveform, and achieve constant current output, and generate a demodulated carrier signal synchronized with the excitation signal; the electrode gating module is mainly used to control the current signal injection and voltage signal measurement; the signal processing module is used to process the electrical signal, The available imaging data is obtained; the imaging data acquisition and communication module completes the acquisition of the DC level, and transmits the acquired imaging data to a computer for imaging.

The internal airbag is made of a silicone rubber film with good flexibility and harmless to the human body. It is inflated into the endoscope tube through the external inflation device, and the gas is injected into the attached endoscope tube through the small hole on the endoscope tube wall. The internal air bag outside the mirror is inflated, and when the measurement is completed, the external inflation device is used to deflate the internal air bag to return to normal. The bottom and top edges of the endoscope in contact with the internal air bag are sealed with a sealant to prevent air leakage.

Fig. 2 is a schematic diagram of the measurement process of the device of the present invention. As shown in the figure, the specific working process of the device is as follows: 1) the detection electrode is contacted with the inner wall of the intestinal tract through the internal air bag attached to the endoscope, and the pressure is used to The contact degree is fed back by the sensor, and then the inflation state of the airbag is adjusted. 2) The PC runs and sends instructions to the signal generation and acquisition device to generate an excitation signal; 3) The excitation signal is converted into an analog excitation signal through the signal preprocessing circuit; 4) The signal generation and acquisition device obtains the measurement method through the PC command, and selects the excitation electrode group; 5) The selected measurement method controls the analog switch to obtain the voltage signal between the corresponding measurement electrodes; 6) The obtained signal passes through signal filtering and analog After data conversion, it is sent to an external processing device (PC) for further processing; 7) According to the measurement method, the excitation electrode group is rotated, and the corresponding measurement electrode group is rotated, and all signals are measured in sequence; 8) When all the excitation and measurement methods of the corresponding measurement method are After the measurement combination is completed, the reconstruction of the electrical impedance image in the three-dimensional space of the object is completed.

The detection electrodes and pressure sensors are fixedly installed on the inner airbag on the outer surface of the endoscope, as shown in Figure 4. Figure 3 is a schematic diagram of the airbag inflation feedback process in this embodiment, as shown in the figure, the pressure sensor will detect the pressure data of the contact surface and transmit the data to the pressure detection circuit, and at the same time, the microprocessor will perform real-time adjustment according to these data, Therefore, the airbag driving circuit is controlled to realize self-adaptive inflation and deflation of the airbag.

Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in terms of form and Various changes may be made in the details without departing from the scope of the invention defined by the claims.

Claims (6)

1. A minimally invasive inflatable rectal electrical impedance characteristic detection device is characterized in that: the device includes an endoscope, an internal air bag, a detection electrode, a pressure sensor, a signal generation and a collection device, and the endoscope is used to realize positioning and Preliminary inspection of the situation in the rectum; the detection electrodes and pressure sensors are fixedly installed on the internal balloon on the outer surface of the endoscope, the detection electrodes are used to send stimulating electrical signals and receive electrical signals returned by the rectal inner wall tissue, and the pressure sensors are used to feed back the internal balloon The pressure situation in contact with the inner wall of the rectum; the signal generation and acquisition device is used to generate and receive electrical stimulation signals, and process the signals accordingly; the internal air bag is set on the endoscope, and the endoscope is inflated through the external inflation device, so that The internal balloon on the endoscope is inflated, so that the detection electrodes and pressure sensors mounted on the endoscope are in close contact with the inner wall of the rectum. 2. A minimally invasive inflatable rectal electrical impedance characteristic detection device according to claim 1, characterized in that: said signal generation and acquisition device is installed inside the endoscope, including a multi-frequency constant current module, electrode selection communication module, signal processing module, imaging data acquisition and communication module; the multi-frequency constant current module is used to generate sinusoidal waveforms of different frequencies, realize constant current output, and generate a demodulated carrier signal synchronized with the excitation signal; the electrode gating module It is mainly used to control current signal injection and voltage signal measurement; the signal processing module is used to process electrical signals to obtain available imaging data; the imaging data acquisition and communication module completes the acquisition of DC level and transmits the acquired imaging data to the computer for imaging. 3. A minimally invasive inflatable rectal electrical impedance characteristic detection device according to claim 1, characterized in that: the internal airbag is made of a silicone rubber film with good flexibility and harmless to the human body, Inflate the endoscope tube through the external inflation device, inject the gas into the internal air bag attached to the outside of the endoscope through the small hole on the endoscope tube wall, and make it expand, and release it through the external inflation device when the measurement is completed Air, so that the internal air bag back to normal. 4. A minimally invasive inflatable rectal electrical impedance characteristic detection device according to claim 3, characterized in that: the external inflatable device adopts an external inflatable airbag, and when the measurement is completed, only the external inflatable airbag needs to be pulled out The gas can be released. 5. A minimally invasive inflatable rectal electrical impedance characteristic detection device according to claim 1, characterized in that: the pressure sensor is used to feed back the pressure of the internal air bag in contact with the inner wall of the rectum, and according to the pressure data fed back To adjust the amount of inflation to the internal air bag, so as to achieve adaptive control for different sizes of intestinal lumen. 6 . A minimally invasive inflatable rectal electrical impedance characteristic detection device according to claim 1 , wherein the pressure sensor is a medical silicon miniature pressure sensor. 7 .