Using method of contrast agent extravasation detector

Abstract

The invention discloses a use method of a contrast agent extravasation detector. The contrast agent extravasation detector comprises a contrast agent detector and a detection pad, during use, the electrode of the contrast agent detector is arranged beside the contrast agent injection port, conductive disinfectant is sprayed or overflowed to the contact surface of the electrode and a human body through the electrode mechanism, the electrode is pulled by the electromagnet to move, the contact pressure of the electrode and the human body is increased, the resistance of the contact surface of the electrode and the human body is reduced, and the detection precision is improved; when the contrast agent is leaked during injection, the contrast agent of the high-conductivity iodine agent or gadolinium agent is leaked to gaps of tissues, the electrical impedance of the human tissues is obviously reduced, the contrast agent detector transmits detected data to the controller, and the controller controls the alarm to give an alarm, controls the high-pressure injector to stop injecting the contrast agent and prompts doctors and nurses to treat the contrast agent in time. Through objective continuous monitoring, subjectivity and intermittency of manual observation are overcome, uninterrupted objective data monitoring is provided, and the workload of medical staff is relieved; contrast agent detection is seamlessly integrated into an existing injection process, and normal injection operation is not interfered.

Description

Technical Field

[0001] This invention relates to a method of using a contrast agent injection leakage detection device, and more particularly to a method of using a contrast agent extravasation detector. Background Technology

[0002] The incidence of contrast agent extravasation is between 0.1% and 1.2%. However, once it occurs, it may cause severe pain at the injection site, skin redness and swelling, and tissue induration. In severe cases, it may cause skin tissue necrosis, ulceration, or even compartment syndrome, leading to functional impairment and causing great physical and mental suffering and economic burden to patients. Currently, contrast agent extravasation mainly relies on manual observation, which has a lag effect: prevention and detection of extravasation mainly depend on the visual observation of radiology nurses and the patient's complaints; however, during high-pressure injection, nurses often need to operate equipment and monitor the patient's vital signs at the same time, making it difficult to keep their eyes on the injection site throughout the entire process; and patients, especially the elderly, children, comatose or anesthetized patients, are not sensitive to pain or cannot express it in time, and it is often not discovered until the extravasation volume has reached tens of milliliters and the skin has become obviously swollen, which is too late. Currently, there is a lack of effective, objective, and real-time early warning tools for contrast agent injection. Clinically, there is a need for an instrument that can be integrated into existing workflows, objectively, in real-time, and continuously monitor subcutaneous tissue changes, and issue an alarm at the very early stage of extravasation. This instrument should be automated and highly sensitive to monitor early signs of contrast agent extravasation, so as to achieve early intervention and minimize patient damage. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a novel method for using a contrast agent extravasation detector to detect contrast agent injection, detect extravasation data of contrast agent injection with a high-pressure injector, control contrast agent leakage, achieve early intervention, and reduce the damage to patients caused by contrast agent leakage.

[0004] The technical solution adopted in this invention is as follows: a contrast agent extravasation detector includes a contrast agent detector and a detection pad. The contrast agent detector includes a main unit and an electrode mechanism. The electrode mechanism includes a shell, electrodes, springs, an upper attractor, an electromagnet, and a permanent magnet. An adjustment gap is provided between the electromagnet and the upper attractor. The detection pad includes a base pad, a lower attractor, and a fixing strap. A method of using the contrast agent extravasation detector includes: The detection pad is fixed to the human body using the fixing straps of the detection pad, and one of the electrode holes of the base pad is located next to the contrast agent injection port of the human body; Insert the two electrodes of the electrode mechanism into the electrode holes located next to the contrast agent injection port and the electrode holes at other locations on the base pad, respectively. The electrode mechanism is positioned on the base pad by using the permanent magnet of the electrode mechanism to attract the lower attraction iron of the base pad; The controller of the host computer controls the electromagnet to be energized. The electromagnet attracts the upper magnet and drives the electrode to overcome the elastic force of the spring and fall down, so that the electrode comes into contact with the human skin, increasing the pressure of the electrode on the human body and reducing the contact resistance between the electrode and the human body surface. Before and after contrast agent injection, a weak and safe alternating current is applied to the subcutaneous tissue using two electrodes through a contrast agent detector, and the resulting voltage difference is measured. When highly conductive iodine or gadolinium contrast agents extravasate into the interstitial space of the tissue, the tissue's electrical impedance value decreases significantly. The two electrodes of the contrast agent detector are used to detect the electrical impedance data of the human tissue at the contrast agent injection site, and to detect whether there is leakage of the contrast agent injected by the high-pressure injector.

[0005] When the contrast agent extravasation detector is used, the pressure applied to the human body surface by the two electrodes is the same; the pressure applied to the human body surface by the two electrodes is the same before and after contrast agent injection.

[0006] When using the contrast agent extravasation detector: After determining the location of the contrast agent injection site, the doctor sets the contrast agent injection port of the detection pad at the contrast agent injection site before injecting the contrast agent into the patient. The main electrode port and its auxiliary electrode port of the detection pad are located at the non-contrast agent injection site. Insert the main electrode of the electrode mechanism into the main electrode hole of the detection pad, insert the auxiliary electrodes into different auxiliary electrode holes around the main electrode hole, and measure the electrical impedance of the human body under the main electrode and each auxiliary electrode position using a contrast agent detector. Use the contrast agent detector to measure the baseline data. The impedance data measured by the contrast agent detector each time is used as the reference data, and the above impedance reference data is stored in the memory of the host controller; During and after contrast agent injection, the position of the detection pad remains unchanged, and the electrical impedance of the human body under the main electrode and each auxiliary electrode is measured using a contrast agent detector. The electrical impedance data of the human body detected by the main electrode and each auxiliary electrode are compared with the corresponding reference data threshold in the memory to determine whether the contrast agent has leaked.

[0007] When using the contrast agent extravasation detector: During contrast agent detection, the detection electrode comes into contact with the human body. The controller opens the discharge valve of the electrode, and the conductive disinfectant in the storage bottle is sprayed or overflowed onto the detection electrode. Then, it leaks through the seepage hole of the detection electrode onto the surface of the human skin, increasing the humidity between the electrode and the human skin surface and reducing the contact resistance between the detection electrode and the human skin surface.

[0008] The method of using the contrast agent extravasation detector includes: The liquid storage bottle of the electrode is connected to the adjusting nut of the upper suction iron through a spring force. When the liquid storage bottle rotates clockwise, its external thread rotates downward along the adjusting nut, the upper suction iron is positioned by its adjusting column, the upper suction iron cannot rotate, the liquid storage bottle drives the detection electrode to descend, the distance between the detection electrode and the bottom of the electrode hole of the base pad decreases, during detection, the stroke of the detection electrode compressing human tissue increases, the pressure applied by the detection electrode to the human body increases, and the contact resistance between the electrode and the human body decreases. When the storage bottle is rotated counterclockwise, the detection electrode rises, increasing the distance between the detection electrode and the bottom of the electrode hole in the base. During detection, the stroke of the detection electrode compressing human tissue decreases, the pressure applied by the detection electrode to the human body decreases, and the contact resistance between the electrode and the human body increases.

[0009] When the electromagnet is energized, it attracts the upper attracting iron, causing the electrode to descend against the spring force, and the adjusting column of the upper attracting iron descends along the adjusting hole of the outer shell; when the electromagnet is de-energized, the upper attracting iron rises under the action of the spring force, and the adjusting column of the upper attracting iron rises along the adjusting hole of the outer shell.

[0010] When the contrast agent extravasation detector is used, it includes: Before contrast agent injection, the impedance of human tissue at the position of the main electrode hole of the detection pad and the position of the auxiliary electrode hole of each surrounding detection pad is measured multiple times using the main electrode and auxiliary electrode instrument. The minimum value of the measured impedance is used as the reference data threshold and stored in the memory of the controller.

[0011] When the contrast agent extravasation detector is used, it includes: During and after contrast agent injection, the position of the detection pad remains unchanged. The controller controls the contrast agent detector to measure the impedance of human tissue at the location of the main electrode hole and each surrounding auxiliary electrode hole. When the injected contrast agent leaks into the human tissue, the impedance of the human tissue decreases significantly. When the measured impedance of human tissue at the location of the main electrode hole and any surrounding auxiliary electrode hole is less than the threshold, the controller activates its alarm to issue an audible and visual alarm, which is displayed on the controller's touch screen display.

[0012] When the contrast agent extravasation detector is used, the controller uses its pressure sensor to detect the pressure changes of human tissue and contrast agent injection before and after injection at the position of the main electrode hole and each of the surrounding auxiliary electrode holes. This is used to assist in monitoring, measure the changes in body surface pressure caused by tissue swelling, and fuse and analyze with impedance data to improve alarm accuracy and reduce false alarms.

[0013] When the contrast agent extravasation detector is used, while the contrast agent is being injected intravenously into the patient using a high-pressure injector, the extravasation detector uses the main electrode near the injection port and the auxiliary electrodes around the injection port to detect the leakage data of the contrast agent. When the injected contrast agent leaks and its impedance is lower than a threshold, the controller transmits a signal to the high-pressure injector through its data output interface and the data input interface of the high-pressure injector. The high-pressure injector then stops injecting, thereby reducing and controlling the leakage of the contrast agent.

[0014] The beneficial effects of this invention are as follows: A contrast agent leakage detector includes a contrast agent detector and a detection pad. In use, the electrodes of the contrast agent detector's electrode mechanism are positioned next to the contrast agent injection port. Conductive disinfectant is sprayed or overflowed onto the contact surface between the electrodes and the human body via the electrode mechanism to reduce contact resistance. An electromagnet is used to move the electrodes, increasing the pressure between the electrodes and the human body, reducing the resistance of the contact surface, and improving detection accuracy. When contrast agent leakage occurs, highly conductive iodine or gadolinium contrast agents seep into the gaps of human tissue, significantly reducing the impedance of the human tissue. The contrast agent detector transmits the detected data to a controller, which then activates an alarm and stops the injection using a high-pressure injector. Contrast agents alert doctors and nurses to timely intervention, gaining crucial time for intervention. The contrast agent detector, highly sensitive to changes in interstitial fluid, combined with algorithms, effectively distinguishes between normal physiological changes and pathological extravasation, significantly reducing false alarms and missed detections. Objective and continuous monitoring overcomes the subjectivity and intermittency of manual observation, providing uninterrupted objective data monitoring and reducing the workload of medical staff. The monitoring method is completely non-invasive, using a weak detection current, posing no harm or additional risk to patients. Contrast agent detection is seamlessly integrated into existing injection procedures without interfering with normal injection operations. The controller automatically records data from each injection, providing objective evidence for medical quality control, research, and potential disputes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a contrast agent extravasation detector; Figure 2 This is a schematic diagram of a contrast agent extravasation detector. Figure 3 This is a schematic diagram of the test pad structure; Figure 4 This is a schematic diagram of the electrode structure; Figure 5 This is a schematic diagram of the detection pad and electrode arrangement.

[0016] Figure label: Contrast agent detector 100, main unit 110, controller 111, touch screen display 112, electrode mechanism 120, housing 121, adjustment hole 1210, electrode 122, detection electrode 1220, storage bottle 1221, discharge valve 1222, conductive disinfectant 1223, seepage hole 1224, contact spherical surface 1225, hose 1226, pressure sensor 1227, external thread 1228, protective cap 1229, bottle cap 1230, spring 123. Upper attractor 124, adjusting nut 1240, adjusting column 1241, electromagnet 125, permanent magnet 126, adjusting gap 127, main electrode 128, auxiliary electrode 129, detection pad 200, base pad 210, bottom 2100, lower attractor 220, fixing strap 230, contrast agent injection hole 201, electrode hole 211, main electrode hole 2110, auxiliary electrode hole 2111, human body 300, contrast agent injection port 301, high-pressure injector 400. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: When detecting the electrical impedance of the human body using a contrast agent extravasation detector, the contact state between the electrode and the skin affects the detection. Firstly, the drier the surface of the body being tested, the greater the contact resistance between the electrode and the skin. Secondly, the resistance of the tested body is inversely proportional to the pressure applied between the electrode and the skin; increasing the pressure reduces the contact resistance. Thirdly, the resistance of the tested body is inversely proportional to the contact area between the electrode and the skin; increasing the contact area reduces the contact resistance. To reduce the contact resistance between the electrode and the skin and improve detection accuracy, an electrode with low electrical impedance has been designed to be suitable for contrast agent detection.

[0018] like Figure 1 The schematic diagram shown illustrates a contrast agent extravasation detector. A contrast agent extravasation detector includes: The contrast agent detector 100 includes a main unit 110 and an electrode mechanism 120; the electrode mechanism 120 includes a housing 121, an electrode 122, a spring 123, an upper attractor 124, an electromagnet 125, and a permanent magnet 126. Electrode 122 is supported inside housing 121 by spring 123. Electrode 122 is movably connected to housing 121. Upper attracting iron 124 is fixedly connected to electrode 122. Electromagnet 125 is fixedly connected to housing 121. Upper attracting iron 124 is located opposite electromagnet 125. An adjustment gap 127 is provided between electromagnet 125 and upper attracting iron 124. When electromagnet 125 is energized, electromagnet 125 attracts upper attracting iron 124, causing electrode 122 to descend against the elastic force of spring 123. When electromagnet 125 is de-energized, electrode 122 rises and returns to its original position under the action of spring 123. The detection pad 200 includes a base pad 210, a lower attraction iron 220, and a fixing strap 230. The base pad 210 is provided with multiple electrode holes 211, and the attraction iron 220 is fixedly connected to the base pad 210. The base pad 210 is made of silicone and elastic woven material, and the fixing strap 230 is provided with elastic buckles 231 to fix the detection pad 200 to the human body 300. The permanent magnet 126 is fixedly connected to the housing 121. The controller 111 of the main unit 110 is connected to the electrode 122 and the electromagnet 125 through the control line. The two electrodes 122 are used to detect the impedance around the contrast agent injection port 301 of the human body 300 and to detect the data of contrast agent injection leakage of the high-pressure injector 400.

[0019] The initial state of the contrast agent extravasation detector is as follows: the electromagnet 125 is not energized, the electromagnet 125 does not attract the upper attracting iron 124 to descend, the electromagnet 125 does not contact the upper attracting iron 124, the electrode 122 is supported at the upper limit position by the spring 123, the electrode 122 is still in the electrode hole 211 of the base pad 210, the adjustment gap 127 between the electromagnet 125 and the upper attracting iron 124 is greater than zero, and the electrode 122 is not in contact with the human skin 300.

[0020] like Figure 2 The diagram shown illustrates the detection method of a contrast agent extravasation detector, and a method for using the contrast agent extravasation detector includes: The detection pad 200 is fixed to the human body 300 using the fixing strap 230, and one of the electrode holes 211 of the base pad 210 is located next to the contrast agent injection port 301 of the human body 300. The two electrodes 122 of the electrode mechanism 120 are respectively inserted into the electrode hole 211 located next to the contrast agent injection port 301 and the electrode hole 211 at other positions of the base pad 210; The permanent magnet 126 of the electrode mechanism 120 attracts the lower attracting iron 220 of the base pad 210, thereby positioning the electrode mechanism 120 on the base pad 210. The controller 111 of the host 110 controls the electromagnet 125 to be energized. The electromagnet 125 attracts the upper attracting iron 124, which drives the electrode 122 to overcome the elastic force of the spring 123 and descend, so that the electrode 122 comes into contact with the skin of the human body 300, increasing the pressure of the electrode 122 on the human body 300 and reducing the contact resistance between the electrode 122 and the surface of the human body 300. Before and after contrast agent injection, the position of the detection pad 200 remains unchanged. A weak and safe alternating current is applied to the subcutaneous tissue of the human body 300 using two electrodes 122 through the contrast agent detector 100, and the resulting voltage difference is measured. When the highly conductive iodine or gadolinium contrast agent extravasates into the interstitial space of the tissue, the tissue impedance value decreases significantly. The impedance data of the human body 300 tissue at the contrast agent injection port 301 is detected through the two electrodes 122 of the contrast agent detector 100 to detect whether the contrast agent injection by the high-pressure injector 400 is leaking.

[0021] To reduce detection errors and variations in detection conditions, the pressure applied by the two electrodes 122 to the surface of the human body 300 is the same when the contrast agent extravasation detector is used; the pressure applied by the two electrodes 122 to the surface of the human body 300 is the same before and after contrast agent injection.

[0022] like Figure 3 The schematic diagram of the detection pad 200 shown shows that the detection pad 200 is provided with a contrast agent injection hole 201. The electrode holes 211 of the detection pad 200 include a main electrode hole 2110 and an auxiliary electrode hole 2111. Multiple auxiliary electrode holes 2111 are provided and are located around the main electrode holes 2110. The main electrode holes 2110 are located next to the contrast agent injection hole 201. The electrode 122 includes a main electrode 128 and an auxiliary electrode 129. The main electrode 128 is located in the main electrode hole 2110, and the auxiliary electrode 129 is located in the auxiliary electrode hole 2111.

[0023] When using the contrast agent extravasation detector: After the doctor determines the location of the contrast agent injection port 301, before the patient injects the contrast agent, the doctor sets the contrast agent injection hole 201 of the detection pad 200 at the location of the contrast agent injection port 301, and the main electrode hole 2110 and the auxiliary electrode hole 2111 are located at the location of the non-contrast agent injection port 301. The main electrode 128 of the electrode mechanism 120 is inserted into the main electrode hole 2110 of the detection pad 200, and the auxiliary electrodes 129 are inserted into different auxiliary electrode holes 2111 around the main electrode hole 2110. The impedance of the human body 300 below the position of the main electrode 128 and each auxiliary electrode 129 is measured by the contrast agent detector 100. The baseline data is measured by the contrast agent detector 100. The impedance data measured by the contrast agent detector 100 each time is used as the reference data, and the above impedance reference data is stored in the memory of the controller 111 of the host 110; During and after contrast agent injection, the position of the detection pad 200 is kept unchanged, and the electrical impedance of the human body 300 below the position of the main electrode 128 and each auxiliary electrode 129 is measured by the contrast agent detector 100. The impedance data of the human body 300 detected by the main electrode 128 and each auxiliary electrode 129 are compared with the corresponding reference data threshold in the memory to determine whether the contrast agent has leaked.

[0024] Because the resistance of dry skin is tens of thousands of ohms, while the resistance of moist skin is hundreds of ohms or even lower, in order to reduce the impact of contact resistance on the accuracy of detection; such as Figure 4 The schematic diagram of the electrode structure shown illustrates that electrode 122 includes a detection electrode 1220, a storage bottle 1221, and a discharge valve 1222. The detection electrode 1220 is fixedly connected to the storage bottle 1221. The discharge valve 1222 contains conductive disinfectant 1223. The storage bottle 1221 is connected to the detection electrode 1220 through the discharge valve 1222 and a flexible tube 1226. The detection electrode 1220 has a seepage hole 1224. The conductive disinfectant 1223 includes iodine, mercurochrome, gentian violet, and alcohol. The detection electrode 1220 is made of copper plated with silver and has a protective cap 1229. The storage bottle 1221 has a cap 1230. The conductive disinfectant 1223 can be added by opening the cap 1230.

[0025] When using the contrast agent extravasation detector: When the contrast agent detector 100 is in operation, the detection electrode 1220 of the electrode 122 comes into contact with the human body 300. The controller 111 controls the opening of the discharge valve 1222, and the conductive disinfectant 1223 in the storage bottle 1221 is sprayed or overflowed onto the detection electrode 1220. Then, it leaks through the seepage hole 1224 of the detection electrode 1220 onto the skin surface of the human body 300, increasing the humidity between the electrode 122 and the skin surface of the human body 300 and reducing the contact resistance between the detection electrode 1220 and the skin surface of the human body 300.

[0026] The detection electrode 1220 is provided with a contact spherical surface 1225 to increase the contact area between the detection electrode 1220 and the surface of the human body 300 and reduce the contact resistance between the detection electrode 1220 and the surface of the human body 300.

[0027] In order to adjust the pressure of the electrode 122 on the human body 300, the distance of the adjustment gap 127 between the electromagnet 125 and the upper attraction iron 124 is changed; the upper attraction iron 124 includes an adjustment nut 1240 and an adjustment column 1241, the outer shell 121 is provided with an adjustment hole 1210, the liquid storage bottle 1221 of the electrode 122 is provided with an external thread 1228, the liquid storage bottle 1221 is movably connected to the adjustment nut 1240 of the upper attraction iron 124 through its external thread 1228, and the adjustment column 1241 of the upper attraction iron 124 is movably connected to the adjustment hole 1210 of the outer shell 121.

[0028] The method of using the contrast agent extravasation detector includes: The liquid storage bottle 1221 of the electrode 122 is connected to the upper suction iron 124 by the spring force of the spring 123 through the dynamic engagement between the bottle and the adjusting nut 1240 of the external thread 1228 and the upper suction iron 124. When the liquid storage bottle 1221 rotates clockwise, its external thread 1228 rotates downward along the adjusting nut 1240, the upper suction iron 124 is positioned by its adjusting column 1241, the upper suction iron 124 cannot rotate, the liquid storage bottle 1221 drives the detection electrode 1220 to descend, the distance between the detection electrode 1220 and the bottom 2100 of the electrode hole 211 of the base pad 210 decreases, during detection, the stroke of the detection electrode 1220 compressing the human body 300 tissue increases, the pressure applied by the detection electrode 1220 to the human body 300 increases, and the contact resistance between the electrode 122 and the human body 300 decreases; When the storage bottle 1221 rotates counterclockwise, the detection electrode 1220 rises, increasing the distance between the detection electrode 1220 and the bottom 2100 of the electrode hole 211 of the base pad 210. During detection, the stroke of the detection electrode 1220 compressing the tissue of the human body 300 decreases, the pressure applied by the detection electrode 1220 to the human body 300 decreases, and the contact resistance between the electrode 122 and the human body 300 increases.

[0029] 6. The method of using a contrast agent extravasation detector according to claim 5, characterized in that: when the electromagnet 125 is energized, the electromagnet 125 attracts the upper attracting iron 124, causing the electrode 122 to descend against the elastic force of the spring 123, and the adjusting column 1241 of the upper attracting iron 124 descends along the adjusting hole 1210 of the outer shell 121; when the electromagnet 125 is de-energized, the upper attracting iron 124 rises under the action of the elastic force of the spring 123, and the adjusting column 1241 of the upper attracting iron 124 rises along the adjusting hole 1210 of the outer shell 121.

[0030] To detect the extent of contrast agent leakage, such as Figure 5 The schematic diagram of the detection pad and electrode arrangement shown indicates that the detection pad 200 includes a main electrode hole 2110 and multiple auxiliary electrode holes 2111 on concentric circles of different diameters of the main electrode hole 2110; the main electrode 128 is disposed in the main electrode hole 2110 and each auxiliary electrode 129 is disposed in the auxiliary electrode hole 2111.

[0031] When the contrast agent extravasation detector is used, it includes: Before the contrast agent is injected, the contrast agent detector 100 uses the main electrode 128 and the auxiliary electrode 129 to measure the electrical impedance of the human tissue 300 at the position of the main electrode hole 2110 and the position of each auxiliary electrode hole 2111 around it multiple times, and the minimum value of the measured electrical impedance is used as the reference data threshold and stored in the memory of the controller 111.

[0032] 8. The method of using a contrast agent extravasation detector according to claim 7, characterized in that: the use of the contrast agent extravasation detector includes: During and after contrast agent injection, the position of the detection pad 200 remains unchanged. The controller 111 controls the contrast agent detector 100 to measure the impedance of the main electrode hole 2110 and the human tissue 300 at each of the surrounding auxiliary electrode holes 2111. When the injected contrast agent leaks, the impedance of the human tissue 300 decreases significantly. When the measured impedance of the main electrode hole 2110 and the human tissue at any of the surrounding auxiliary electrode holes 2111 is less than the threshold, the controller 111 controls its alarm to perform an audible and visual alarm, which is displayed on the touch screen display 112 of the controller 111.

[0033] When contrast agent leaks during injection, the human tissue will swell and the tension of the human tissue will increase. In order to detect the change in the tension of the human tissue and determine the degree of contrast agent leakage, the electrode 122 includes a pressure sensor 1227. The reservoir bottle 1221 of the electrode 122 is connected to the detection electrode 1220 through the pressure sensor 1227, so as to determine the situation of contrast agent leakage by detecting the pressure at the detection position of the human body 300.

[0034] When the contrast agent extravasation detector is used, the controller 111 uses the pressure sensor 1227 to detect the pressure changes of the human body 300 tissue before and after contrast agent injection at the position of the main electrode hole 2110 and the position of each surrounding auxiliary electrode hole 2111. This is used to assist in monitoring, measure the changes in body surface pressure caused by tissue swelling, and fuse and analyze with impedance data to improve alarm accuracy and reduce false alarms.

[0035] To promptly stop contrast agent injection in case of leakage during high-pressure injection, the controller 111 includes a data output interface 113 connected to the data input interface of the high-pressure injector 400; or, the controller 111 includes a wireless transmission module, including Bluetooth, for wirelessly transmitting real-time monitoring data from the contrast agent detector 100 to the central control console or mobile nursing terminal at the nurse station, enabling remote monitoring and data recording.

[0036] like Figure 5The diagram shows the detection pad and electrode arrangement. When the contrast agent extravasation detector is used, while the high-pressure injector 400 injects the contrast agent intravenously into the patient, the extravasation detector uses the main electrode 128 near the contrast agent injection port 301 and the auxiliary electrodes 129 around the injection port 301 to detect contrast agent leakage data. When the contrast agent injected by the high-pressure injector 400 leaks and its impedance falls below a threshold, the controller 111 transmits a signal to the high-pressure injector 400 through its data output interface 113 and the data input interface of the high-pressure injector 400. The high-pressure injector 400 then stops injecting, reducing and controlling contrast agent leakage.

Claims

1. A method of using a contrast agent extravasation detector, wherein the contrast agent extravasation detector comprises: A contrast agent detector (100) and a detection pad (200), the contrast agent detector (100) including a main unit (110) and an electrode mechanism (120); the electrode mechanism (120) includes a housing (121), electrodes (122), a spring (123), an upper attractor (124), an electromagnet (125) and a permanent magnet (126), an adjustment gap (127) being provided between the electromagnet (125) and the upper attractor (124); the detection pad (200) includes a base pad (210), a lower attractor (220) and a fixing strap (230); characterized in that it includes: The detection pad (200) is fixed to the human body (300) using the fixing strap (230) of the detection pad (200), and one of the electrode holes (211) of the base pad (210) is located next to the contrast agent injection port (301) of the human body (300); Insert the two electrodes (122) of the electrode mechanism (120) into the electrode holes (211) located next to the contrast agent injection port (301) and the electrode holes (211) at other locations on the base pad (210), respectively. The electrode mechanism (120) is positioned on the base pad (210) by using the permanent magnet (126) of the electrode mechanism (120) to attract the lower attraction iron (220) of the base pad (210); The controller (111) of the host (110) controls the electromagnet (125) to be energized. The electromagnet (125) attracts the upper attracting iron (124) to drive the electrode (122) to overcome the elastic force of the spring (123) and drop, so that the electrode (122) comes into contact with the skin of the human body (300), increasing the pressure of the electrode (122) on the human body (300) and reducing the contact resistance between the electrode (122) and the surface of the human body (300). Before and after contrast agent injection, a weak and safe alternating current is applied to the subcutaneous tissue of the human body (300) using two electrodes (122) through a contrast agent detector (100), and the resulting voltage difference is measured. When the highly conductive iodine or gadolinium contrast agent extravasates into the interstitial space of the tissue, the tissue impedance value is significantly reduced. The impedance data of the human body (300) tissue at the contrast agent injection port (301) is detected through the two electrodes (122) of the contrast agent detector (100), and whether the contrast agent injection by the high-pressure injector (400) is leaking is detected.

2. The method of using a contrast agent extravasation detector according to claim 1, characterized in that: When the contrast agent extravasation detector is used, the pressure applied by the two electrodes (122) to the surface of the human body (300) is the same; the pressure applied by the two electrodes (122) to the surface of the human body (300) is the same before and after the contrast agent injection.

3. The method of using a contrast agent extravasation detector according to claim 2, characterized in that: When using the contrast agent extravasation detector: After determining the location of the contrast agent injection port (301), the doctor sets the contrast agent injection hole (201) of the detection pad (200) at the location of the contrast agent injection port (301) before the patient injects the contrast agent. The main electrode hole (2110) and its auxiliary electrode hole (2111) of the detection pad (200) are located at the location of the non-contrast agent injection port (301). Insert the main electrode (128) of the electrode mechanism (120) into the main electrode hole (2110) of the detection pad (200), insert the auxiliary electrode (129) into different auxiliary electrode holes (2111) around the main electrode hole (2110), and measure the impedance of the human body (300) below the position of the main electrode (128) and each auxiliary electrode (129) using the contrast agent detector (100), and perform baseline data measurement using the contrast agent detector (100); The impedance data detected by the contrast agent detector (100) is used as the reference data, and the above impedance reference data is stored in the memory of the controller (111) of the host (110); During and after contrast agent injection, the position of the detection pad (200) is kept unchanged, and the electrical impedance of the human body (300) under the position of the main electrode (128) and each auxiliary electrode (129) is measured by the contrast agent detector (100); The impedance data of the human body (300) detected by the main electrode (128) and each auxiliary electrode (129) are compared with the corresponding reference data threshold in the memory to determine whether the contrast agent has leaked.

4. The method of using a contrast agent extravasation detector according to claim 3, characterized in that: When using the contrast agent extravasation detector: When the contrast agent detector (100) is in operation, the detection electrode (1220) of the electrode (122) comes into contact with the human body (300). The controller (111) controls the opening of the discharge valve (1222) of the electrode (122), and the conductive disinfectant (1223) in the storage bottle (1221) is sprayed or overflowed onto the detection electrode (1220), and then leaks through the seepage hole (1224) of the detection electrode (1220) onto the skin surface of the human body (300), increasing the humidity between the electrode (122) and the skin surface of the human body (300), and reducing the contact resistance between the detection electrode (1220) and the skin surface of the human body (300).

5. The method of using a contrast agent extravasation detector according to claim 3, characterized in that: The method of using the contrast agent extravasation detector includes: The liquid storage bottle (1221) of the electrode (122) is connected to the adjusting nut (1240) of the upper attraction iron (124) by the spring force of the spring (123); When the storage bottle (1221) rotates clockwise, its external thread (1228) rotates downward along the adjusting nut (1240), the upper suction iron (124) is positioned by its adjusting column (1241), the upper suction iron (124) cannot rotate, the storage bottle (1221) drives the detection electrode (1220) to descend, the distance between the detection electrode (1220) and the bottom (2100) of the electrode hole (211) of the base pad (210) decreases, during detection, the stroke of the detection electrode (1220) compressing the human body (300) tissue increases, the pressure applied by the detection electrode (1220) to the human body (300) increases, and the contact resistance between the electrode (122) and the human body (300) decreases; When the storage bottle (1221) is rotated counterclockwise, the detection electrode (1220) rises, the distance between the detection electrode (1220) and the bottom (2100) of the electrode hole (211) of the base pad (210) increases, during detection, the stroke of the detection electrode (1220) compressing the human body (300) tissue decreases, the pressure applied by the detection electrode (1220) to the human body (300) decreases, and the contact resistance between the electrode (122) and the human body (300) increases.

6. The method of using a contrast agent extravasation detector according to claim 5, characterized in that: When the electromagnet (125) is energized, the electromagnet (125) attracts the upper attracting iron (124), which drives the electrode (122) to descend against the elastic force of the spring (123). The adjusting column (1241) of the upper attracting iron (124) descends along the adjusting hole (1210) of the outer shell (121). When the electromagnet (125) is de-energized, the upper attracting iron (124) rises under the action of the elastic force of the spring (123), and the adjusting column (1241) of the upper attracting iron (124) rises along the adjusting hole (1210) of the outer shell (121).

7. The method of using a contrast agent extravasation detector according to claim 1, characterized in that: When the contrast agent extravasation detector is used, it includes: Before contrast agent injection, the impedance of the human tissue (300) at the position of the main electrode hole (2110) of the detection pad (200) and the position of the auxiliary electrode hole (2111) of each surrounding detection pad (200) is measured multiple times using the main electrode (128) and auxiliary electrode (129) by the contrast agent detector (100), and the minimum value of the measured impedance is stored in the memory of the controller (111) as a reference data threshold.

8. The method of using a contrast agent extravasation detector according to claim 7, characterized in that: When the contrast agent extravasation detector is used, it includes: During and after contrast agent injection, the controller (111) controls the contrast agent detector (100) to measure the impedance of the human tissue (300) at the main electrode hole (2110) and each of the surrounding auxiliary electrode holes (2111). When the injected contrast agent leaks, the contrast agent leaks into the human tissue (300), and the impedance of the human tissue (300) decreases significantly. When the measured impedance of the human tissue (300) at the main electrode hole (2110) and any of the surrounding auxiliary electrode holes (2111) is less than the threshold, the controller (111) controls its alarm to perform an audible and visual alarm, and displays it on the touch screen display (112) of the controller (111).

9. The method of using a contrast agent extravasation detector according to claim 8, characterized in that: When the contrast agent extravasation detector is used, the controller (111) uses its pressure sensor (1227) to detect the pressure changes of the human body (300) tissue and contrast agent before and after injection at the position of the main electrode hole (2110) and the position of each surrounding auxiliary electrode hole (2111). This is used to assist in monitoring, measure the changes in body surface pressure caused by tissue swelling, and integrate and analyze the data with impedance data to improve alarm accuracy and reduce false alarms.

10. The method of using a contrast agent extravasation detector according to claim 9, characterized in that: When the contrast agent extravasation detector is used, while the contrast agent is injected into the patient's vein by the high-pressure injector (400), the extravasation detector uses the main electrode (128) near the contrast agent injection port (301) and the auxiliary electrode (129) around the contrast agent injection port (301) to detect the leakage data of the contrast agent. When the injected contrast agent leaks and its impedance is lower than the threshold, the controller (111) transmits a signal to the high-pressure injector (400) through its data output interface (113) and the data input interface of the high-pressure injector (400), and the high-pressure injector (400) stops the injection to reduce and control the contrast agent leakage.

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