Nerve monitoring trachea cannula electrode connection detection device
By setting two sets of electrodes and an impedance sampling module on the endotracheal cannula for neuromonitoring, combined with a switch array and a third electrode grounding signal, the problem of poor contact of the endotracheal cannula electrodes for neuromonitoring in a narrow area was solved, and rapid and reliable signal acquisition and electrode contact status judgment were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-04-03
AI Technical Summary
During surgery, especially neck and chest surgeries, the electrodes for neuromonitoring endotracheal intubation are prone to poor contact or short circuits due to the small working area and vocal cord movement, resulting in unstable signal acquisition.
Design a neurological monitoring endotracheal intubation electrode connection detection device, setting up two sets of electrodes and an impedance sampling module, judging the contact state between the electrodes and vocal cord muscles through multi-link detection, using a switch array to select electrode connection, and using the ground signal of the third electrode to judge the impedance value.
It enables rapid and reliable determination of the contact state between the electrode and the vocal cord muscle within a confined working area, ensuring the effectiveness and stability of signal acquisition and avoiding problems such as electrode short circuits and poor contact.
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Figure CN224070439U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of endotracheal intubation for neurological monitoring, and in particular to a device for detecting electrode connections in endotracheal intubation for neurological monitoring. Background Technology
[0002] Currently, during surgeries, especially those involving the neck and chest, to avoid damage to important nerves such as the recurrent laryngeal nerve, a device combining an endotracheal tube and nerve monitoring is typically used. This involves using a nerve-monitoring endotracheal tube as an accessory for an intraoperative nerve monitoring system. When using this system, it's crucial to ensure the signal acquisition pathway is connected effectively and to acquire the impedance value of the signal pathway in real time. This is generally achieved by using an impedance converter to output a constant current signal of a certain frequency, passing it through the signal pathway, and then analyzing the amplitude and phase of the acquired signal to calculate the impedance value of the signal pathway.
[0003] Because the structure of the neuro-monitoring endotracheal cannula contains multiple electrode pathways, and the working position of the neuro-monitoring endotracheal cannula is located in the vocal cord region of the larynx; therefore, during use, the working area is relatively small and the vocal cords are constantly moving, which can easily lead to poor contact or short circuits of the electrodes. Therefore, an impedance detection scheme needs to be designed. Utility Model Content
[0004] To address the issues of limited working area and poor contact or electrode short circuits caused by constant vocal cord movement, this application provides a nerve monitoring endotracheal intubation electrode connection detection device.
[0005] A neuromonitoring endotracheal tube electrode connection detection device is disposed on the side wall of the neuromonitoring endotracheal tube. The side wall of the neuromonitoring endotracheal tube is provided with two sets of electrodes, which respectively abut against the two sides opposite to the vocal cord muscles of the human body. The electrode sets are coupled to electrode connectors, which are coupled to an impedance sampling module. The impedance sampling module calculates the impedance value and compares it with a reference range, and outputs a comparison result signal.
[0006] By adopting the above technical solution and setting up two sets of electrodes, it is convenient to collect the neuronal signals received by the two sets of electrodes. Then, based on the acquired electrode signals, the impedance between electrodes in the same group and the impedance between the two sets of electrodes can be determined to determine whether the contact is good. At this time, multi-link detection is formed, which makes it convenient for staff to judge the effectiveness of the connection between the current electrode and the human body and the reliability of the acquired signal through multi-link detection. This achieves the purpose of judging the contact status between the electrode and the vocal cord muscles even in a small working area and when the vocal cords are constantly moving.
[0007] Furthermore, the two sets of electrode groups are defined as a first electrode group and a second electrode group, respectively. The first electrode group includes at least two first electrodes, and the second electrode group includes at least one second electrode.
[0008] First monitoring state: Connect the electrode connectors corresponding to the two first electrodes, the impedance sampling module calculates the first impedance value between the two first electrodes, and determines whether the two first electrodes are in good contact with the vocal cord muscles based on the first impedance value;
[0009] Second monitoring state: Connect one of the electrode connectors corresponding to the first electrode and the second electrode, the impedance sampling module calculates the second impedance value between the first electrode and the second electrode, and determines whether the first electrode and the second electrode are in good contact with the vocal cord muscles based on the second impedance value.
[0010] By adopting the above technical solution, it is possible to detect whether two electrodes located on the same side or two electrodes located on opposite sides are in good contact with the vocal cord muscles of the current patient; it is possible to quickly detect two sets of electrodes and determine the effectiveness of the connection between the electrodes and the human body and the reliability of the acquired signals.
[0011] Furthermore, the two sets of electrode groups are defined as a first electrode group and a second electrode group, respectively. The first electrode group includes at least two first electrodes, and the second electrode group includes at least two second electrodes.
[0012] First monitoring state: Connect the electrode connectors corresponding to the two first electrodes, the impedance sampling module calculates the first impedance value between the two first electrodes, and determines whether the two first electrodes are in good contact with the vocal cord muscles based on the first impedance value;
[0013] Second monitoring state: Connect one electrode connector corresponding to the first electrode and the second electrode, the impedance sampling module calculates the second impedance value between the first electrode and the second electrode, and determines whether the first electrode and the second electrode are in good contact with the vocal cord muscles based on the second impedance value;
[0014] Third detection state: Connect the electrode connectors corresponding to the two second electrodes, the impedance sampling module calculates the first impedance value between the two first electrodes, and determines whether the two first electrodes are in good contact with the vocal cord muscles based on the first impedance value.
[0015] By adopting the above technical solution, it is possible to detect whether multiple electrodes are in good contact with the vocal cord muscles of the current patient, and to quickly locate electrodes with poor contact through the detection results; to quickly detect two sets of electrodes, and to determine the effectiveness of the connection between the electrodes and the human body and the reliability of the acquired signals.
[0016] Furthermore, it also includes a third electrode, which is connected to a ground signal and has a corresponding electrode connector; simultaneously, the electrode connectors corresponding to the first electrode and the third electrode, or the electrode connectors corresponding to the second electrode and the third electrode, are connected to obtain the impedance value between the first electrode and ground, or the impedance value between the second electrode and ground.
[0017] By adopting the above technical solution, the impedance value between the first or second electrode and ground can be easily obtained through the grounding signal of the third electrode. Based on the impedance value, the staff can determine whether the first or second electrode is in good contact, thus forming a multi-link detection of the contact status between the electrodes and vocal cord muscles in the two electrode groups.
[0018] Furthermore, a switch array is provided between the electrode connector and the impedance sampling module, and the switch array can selectively connect to the first electrode, the second electrode, or the third electrode.
[0019] By adopting the above technical solution, the operator can select to connect two of the first, second, or third electrodes through the switch array settings. Then, the impedance sampling module can obtain the impedance value between the two connected electrodes. Based on the impedance value, the operator can determine whether the first or second electrode currently connected is in good contact with the vocal cord muscle. In the above process, the operator does not need to plug and unplug the electrode connectors back and forth. The corresponding electrode can be passed through by the switch array alone, which is convenient for the operator.
[0020] Furthermore, the third electrode is attached to the chest or shoulder area of the human body.
[0021] By adopting the above technical solution, a ground electrode can be obtained by attaching the third electrode to the chest or shoulder of the current monitoring personnel, which facilitates the monitoring of the first electrode or the second electrode separately.
[0022] Furthermore, the reference range includes a first reference range, a second reference range, and a third reference range; wherein, the first reference range is a standard range corresponding to the impedance values between the two first electrodes; the second reference range is a standard range corresponding to the impedance values between the two second electrodes; and the third reference range is a standard range corresponding to the impedance values between the first electrode and the second electrode.
[0023] By adopting the above technical solution and using the corresponding standard range, it is determined whether the impedance value between the two electrodes meets the requirements, that is, whether the two electrodes are in good contact with the vocal cord muscles.
[0024] Furthermore, the reference range also includes a fourth reference range and a fifth reference range; the fourth reference range is a standard range corresponding to the impedance value between the first electrode and ground; the fifth reference range is a standard range corresponding to the impedance value between the second electrode and ground.
[0025] By adopting the above technical solution, and through the corresponding standard range, it is determined whether the impedance value between the two electrodes and ground meets the requirements, forming a multi-link detection state between the electrodes and the vocal cord muscles, and accurately locating electrodes with poor contact.
[0026] In summary, the use of two sets of electrodes facilitates the acquisition of neuronal signals received by both sets. These signals can then be compared with a baseline range to determine the impedance between electrodes within the same set and between the two sets of electrodes, indicating good contact. This creates a multi-link detection mechanism, allowing operators to assess the effectiveness of the connection between the electrodes and the body, as well as the reliability of the acquired signals. This enables the assessment of the contact status between the electrodes and the vocal cord muscles even in confined working areas with constant vocal cord movement. Attached Figure Description
[0027] Figure 1 This is a schematic diagram illustrating the actual application of the neuromonitoring endotracheal intubation electrode connection detection device of this application;
[0028] Figure 2 This is a schematic diagram of the signal transmission of the neuromonitoring endotracheal intubation electrode connection detection device of this application.
[0029] Figure reference numerals: 1. Endotracheal tube for nerve monitoring; 2. Electrode connector; 3. Impedance sampling module; 4. First electrode group; 41. First electrode; 5. Second electrode group; 51. Second electrode; 6. Third electrode; 7. Switch array; 10. Left vocal cord muscle; 20. Right vocal cord muscle. Detailed Implementation
[0030] See attached document Figure 1 -Appendix Figure 2 The composition, features, and advantages of the neuromonitoring endotracheal intubation electrode connection detection device according to this application will be described below by way of example, but all descriptions should not be used to limit this application in any way.
[0031] Furthermore, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the accompanying drawings, this application still allows for any combination or deletion of these technical features (or their equivalents) without any technical obstacle, and thus these further embodiments according to this application should also be considered within the scope of this description.
[0032] It should also be noted that terms such as "setup" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can refer to a direct connection or an indirect connection through an intermediate medium. Unless otherwise explicitly defined, those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0033] This application provides a neuro-monitoring endotracheal tube electrode connection detection device. This device can be installed on the side wall of the neuro-monitoring endotracheal tube, serving as an accessory for an intraoperative neuro-monitoring instrument. During surgery, it monitors whether the electrode on the side wall of the endotracheal tube is in good contact with the vocal cord muscles.
[0034] It is understandable that the good contact between the electrode and the human vocal cords refers to the state in which the electrode can stably transmit neuronal signals, while the poor contact between the electrode and the human vocal cords refers to the state in which the electrode cannot stably transmit neuronal signals.
[0035] See attached document Figure 1 -Appendix Figure 2 Two sets of electrodes are installed on the side wall of the neuromonitoring endotracheal cannula 1, respectively for contact with the left and right sides of the human vocal cords to transmit neuronal signals. The electrodes in the two sets are arranged along the axial direction of the neuromonitoring endotracheal cannula 1 and extend to form electrode connectors 2. The electrodes in the sets are electrically connected to the electrode connectors 2, and are arranged in a one-to-one correspondence. The electrode connectors 2 are connected to an impedance sampling module 3, which calculates the monitored impedance value, compares it with a reference range, and outputs the comparison result to facilitate staff in determining whether the electrodes are making good contact with the human vocal cords.
[0036] The two sets of electrodes can be defined as the first electrode set 4 and the second electrode set 5, respectively. The first electrode set 4 is used to contact the left vocal cord of the human body, and the second electrode set 5 is used to contact the right vocal cord of the human body; or the first electrode set 4 can be used to contact the right vocal cord muscle 20 of the human body, and the second electrode set 5 can be used to contact the left vocal cord muscle 10 of the human body.
[0037] In one embodiment, the first electrode group 4 includes at least two first electrodes 41, and the second electrode group 5 includes at least one second electrode 51; each of the at least two first electrodes 41 and the second electrode 51 is correspondingly provided with an electrode connector 2. The first electrodes 41 and the second electrodes 51 can transmit the monitored neuronal signals to the electrode connector 2, and then connect to the impedance sampling module 3 through the electrode connector 2. The impedance sampling module 3 can calculate the impedance value of the electrode connected to the electrode connector 2, which facilitates the determination of whether the corresponding electrode is in good contact with the corresponding vocal cord muscle. Here, the first electrodes 41 and the second electrodes 51 can be formed by silver paste printing.
[0038] The impedance sampling module 3 can be a common impedance sampling module 3 in the prior art. The impedance sampling module 3 typically includes a signal generation unit, a signal acquisition circuit, a comparison and calculation unit, and a control and interface circuit.
[0039] Signal generation unit: Responsible for generating sinusoidal signals with a settable frequency, typically consisting of an oscillator and a frequency control circuit. The oscillator generates a stable periodic signal, while the frequency control circuit precisely adjusts the signal frequency according to user settings or system requirements.
[0040] Signal acquisition circuit: Used to acquire signals after they have passed through the signal link. It includes components such as amplifiers and filters. The amplifier amplifies the weak signal for subsequent processing and measurement; the filter removes noise and interference from the signal, improving the quality of the acquired signal.
[0041] Comparison and Calculation Unit: This is the core part of the impedance sampling module 3, consisting of an analog comparator, a digital signal processor (DSP) or a microcontroller (MCU). The analog comparator performs a preliminary comparison of the amplitude and phase of the acquired signal and the original signal. After converting the analog signal into a digital signal, the DSP or MCU performs precise calculations using a preset algorithm to finally obtain the impedance value.
[0042] Control and interface circuitry: Used for communication and interaction with external devices, receiving user commands or system control signals, and setting parameters such as the frequency of the signal generator. It can also output calculated impedance values to external devices for display, storage, or further analysis.
[0043] Specifically, there are the following two monitoring states:
[0044] First monitoring state: The electrode connectors 2 corresponding to the two first electrodes 41 are simultaneously connected. At this time, the impedance sampling module 3 receives the signals transmitted by the two first electrodes 41 and then calculates the impedance value between the two first electrodes 41, which is defined as the first impedance value in this application. Then, the impedance sampling module 3 compares the first impedance value with a preset reference range, which is defined as the first reference range. That is, the first reference range is the standard range corresponding to the impedance value between the two first electrodes 41. According to the comparison result, it can be determined whether the two first electrodes 41 are in good contact with the vocal cord muscles.
[0045] If the first impedance value is greater than the first reference range, it indicates poor contact between the two first electrodes 41 and the left vocal cord muscle 10; if the first impedance value is less than the first reference range, it indicates a short circuit between the two first electrodes 41. In both cases, the staff needs to adjust the position of the endotracheal tube for nerve detection until the first impedance value meets the requirements of the first reference range.
[0046] Second monitoring state: Simultaneously connect the electrode connector 2 corresponding to the first electrode 41 and the second electrode 51. At this time, the impedance sampling module 3 receives the signal transmitted by the connected first electrode 41 and the second electrode 51, and calculates the impedance value between the connected first electrode 41 and the second electrode 51, which is defined as the second impedance value. Then, it compares the second impedance value with a preset reference range, which is defined as the second reference range. That is, the second reference range is the standard range corresponding to the impedance value between the first electrode 41 and the second electrode 51. According to the comparison result, it can be determined whether the connected first electrode 41 and the second electrode 51 are in good contact with the vocal cord muscles.
[0047] In another embodiment, at least two second electrodes 51 are provided in the second electrode group 5. In this case, in addition to the first and second monitoring states described above, a third monitoring state can also be set, as follows:
[0048] Third detection state: The electrode connectors 2 corresponding to the two second electrodes 51 are simultaneously connected. At this time, the impedance sampling module 3 receives the signals transmitted by the two second electrodes 51 and then calculates the impedance value between the two second electrodes 51, which is defined as the third impedance value in this application. Then, the impedance sampling module 3 compares the third impedance value with a preset reference range, which is defined as the third reference range. That is to say, the third reference range is the standard range corresponding to the impedance value between the two second electrodes 51. According to the comparison result, it can be determined whether the two second electrodes 51 are in good contact with the vocal cord muscles.
[0049] If the third impedance value is greater than the third reference range, it indicates poor contact between the two second electrodes 51 and the left vocal cord muscle 10; if the third impedance value is less than the third reference range, it indicates a short circuit between the two second electrodes 51. In both cases, the staff needs to adjust the position of the endotracheal tube for nerve detection until the third impedance value meets the requirements of the third reference range.
[0050] The first impedance value is close to or the same as the third impedance value; the first reference range is close to or the same as the third reference range.
[0051] In another embodiment, a third electrode 6 can also be provided. The third electrode 6 is used to receive a remote ground signal. In practical applications, the third electrode 6 can be attached to the chest or shoulder of the human body so that the third electrode 6 can output a ground signal. In this embodiment, the third electrode 6 can be an adhesive electrode, which is convenient for workers to attach the third electrode 6 to the human body.
[0052] The third electrode 6 is also correspondingly provided with an electrode connector 2. In this embodiment, by simultaneously connecting one of the first electrode 41 or the second electrode 51 and the third electrode 6, the impedance value between the first electrode 41 or the second electrode 51 and ground is monitored, and further, the good contact between the first electrode 41 or the second electrode 51 and the vocal cord muscles is monitored. The specific monitoring status is as follows:
[0053] Fourth monitoring state: Simultaneously connect one electrode connector 2 corresponding to the first electrode 41 and the third electrode 6. At this time, the impedance sampling module 3 receives the signal transmitted by the connected first electrode 41 and the third electrode 6, and calculates the impedance value between the connected first electrode 41 and the third electrode 6, which is defined as the fourth impedance value. Then, it compares the fourth impedance value with a preset reference range, which is defined as the fourth reference range. That is, the fourth reference range is the standard range corresponding to the impedance value between the first electrode 41 and ground. According to the comparison result, it can be determined that the sampling signal output by the connected first electrode 41 will not be attenuated by the link impedance.
[0054] Fifth monitoring state: Simultaneously connect one electrode connector 2 corresponding to the second electrode 51 and the third electrode 6. At this time, the impedance sampling module 3 receives the signal transmitted by the connected second electrode 51 and the third electrode 6, and calculates the impedance value between the connected second electrode 51 and the third electrode 6, which is defined as the fifth impedance value. Then, it compares the fifth impedance value with a preset reference range, which is defined as the fifth reference range. That is to say, the fifth reference range is the standard range corresponding to the impedance value between the second electrode 51 and ground. According to the comparison result, it can be determined that the sampling signal output by the connected second electrode 51 will not be attenuated by the link impedance.
[0055] The fourth impedance value is close to or the same as the fifth impedance value; the fourth reference range is close to or the same as the fifth reference range.
[0056] In another embodiment, a switch array 7 may be provided between the multiple electrode connectors 2 and the impedance sampling module 3; the operator can use the switch array 7 to select any two of the first electrode 41, the second electrode 51 or the third electrode 6 to connect, so that the impedance can be calculated by the module to obtain the corresponding impedance value without plugging and unplugging the electrode connectors 2, which is convenient for operation and saves time.
[0057] The principle of the neuromonitoring endotracheal intubation electrode connection detection device disclosed in this application is as follows: By setting up two sets of electrodes and a third electrode 6, the impedance sampling module 3 can easily collect the impedance value between two first electrodes 41, or the impedance value between one first electrode 41 and one second electrode 51, or the impedance value between two second electrodes 51, or the impedance value between the first electrode 41 and the third electrode 6, or the impedance value between the second electrode 51 and the third electrode 6. Then, it is determined whether the corresponding impedance value meets the corresponding reference range, which makes it convenient for the staff to judge the effectiveness of the connection between the electrode and the staff and the reliability of the collected signal through a multi-link method. This achieves the purpose of judging the contact state between the electrode and the vocal cord muscle in a small working area and when the vocal cords are constantly moving.
[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A nerve monitoring endotracheal tube electrode connection detection device provided on a side wall of a nerve monitoring endotracheal tube (1), characterized in that, The side wall of the nerve monitoring tracheal cannula (1) is provided with two groups of electrode groups, and the two groups of electrode groups are respectively in contact with the two sides of the human vocal cord muscles; the electrode groups are coupled to the electrode connector (2), and the electrode connector (2) is coupled to the impedance sampling module (3); the impedance sampling module (3) calculates the impedance value and compares it with the reference range, and outputs the comparison result signal.
2. The nerve monitoring endotracheal tube electrode connection detection device of claim 1, wherein, The two groups of electrode groups are respectively defined as a first electrode group (4) and a second electrode group (5), the first electrode group (4) includes at least two first electrodes (41), and the second electrode group (5) includes at least one second electrode (51); The first monitoring state: turn on the electrode connector (2) corresponding to the two first electrodes (41), the impedance sampling module (3) calculates the first impedance value between the two first electrodes (41), and judges whether the two first electrodes (41) are in good contact with the vocal cord muscles based on the first impedance value; The second monitoring state: turn on the electrode connector (2) corresponding to one first electrode (41) and the second electrode (51), the impedance sampling module (3) calculates the second impedance value between the first electrode (41) and the second electrode (51), and judges whether the first electrode (41) and the second electrode (51) are in good contact with the vocal cord muscles based on the second impedance value.
3. The nerve monitoring endotracheal tube electrode connection detection device of claim 1, wherein, The two groups of electrode groups are respectively defined as a first electrode group (4) and a second electrode group (5), the first electrode group (4) includes at least two first electrodes (41), and the second electrode group (5) includes at least two second electrodes (51); The first monitoring state: turn on the electrode connector (2) corresponding to the two first electrodes (41), the impedance sampling module (3) calculates the first impedance value between the two first electrodes (41), and judges whether the two first electrodes (41) are in good contact with the vocal cord muscles based on the first impedance value; The second monitoring state: turn on the electrode connector (2) corresponding to one first electrode (41) and one second electrode (51), the impedance sampling module (3) calculates the second impedance value between the first electrode (41) and the second electrode (51), and judges whether the first electrode (41) and the second electrode (51) are in good contact with the vocal cord muscles based on the second impedance value. The third detection state: turn on the electrode connector (2) corresponding to the two second electrodes (51), the impedance sampling module (3) calculates the first impedance value between the two first electrodes (41), and judges whether the two first electrodes (41) are in good contact with the vocal cord muscles based on the first impedance value.
4. The nerve monitoring endotracheal tube electrode connection detection device of claim 2 or 3, wherein, The third electrode (6) is connected to the ground signal, and the third electrode (6) is correspondingly arranged with the electrode connector (2); the electrode connector (2) corresponding to the first electrode (41) and the third electrode (6) or the electrode connector (2) corresponding to the second electrode (51) and the third electrode (6) are connected at the same time, so as to obtain the impedance value between the first electrode (41) and the ground or the impedance value between the second electrode (51) and the ground.
5. The nerve monitoring endotracheal tube electrode connection detection device of claim 4, wherein, A switch array (7) is arranged between the electrode connector (2) and the impedance sampling module (3), and the switch array (7) can select to communicate the first electrode (41), the second electrode (51) or the third electrode (6).
6. The nerve monitoring endotracheal tube electrode connection detection device of claim 4, wherein, The third electrode (6) is attached to the chest or shoulder of the human body.
7. The nerve monitoring endotracheal tube electrode connection detection device of claim 2 or 3, wherein, The reference range includes a first reference range, a second reference range and a third reference range; the first reference range is a standard range corresponding to the impedance value between the two first electrodes (41); the second reference range is a standard range corresponding to the impedance value between the first electrode (41) and the second electrode (51); and the third reference range is a standard range corresponding to the impedance value between the two second electrodes (51).
8. The nerve monitoring endotracheal tube electrode connection detection device of claim 4, wherein, The reference range further includes a fourth reference range and a fifth reference range; the fourth reference range is a standard range corresponding to the impedance value between the first electrode (41) and the ground; and the fifth reference range is a standard range corresponding to the impedance value between the second electrode (51) and the ground.