Operation demonstration mold for PICC (Peripherally Inserted Central Catheter) intracavity electrocardiogram positioning

Abstract

The invention belongs to the technical field of electrocardiogram positioning demonstration teaching aids, and provides an operation demonstration mold for PICC intracavity electrocardiogram positioning, which comprises a file clamping plate I. One side of the file clamping plate I is provided with an infusion bag, one side of the infusion bag is fixedly connected with an infusion apparatus, one end of the infusion apparatus is fixedly connected with a steel needle head, and the other end of the steel needle head is fixedly connected with a handle. A file clamping plate II is arranged on one side of the file clamping plate I; a monitor and a human anatomical diagram are displayed through the first file clamping plate and the second file clamping plate respectively, a visual space corresponding relation is established, students are helped to form clear structural cognition before practical training, the infusion bag, the infusion apparatus, the steel needle head and the heparin cap are communicated with an inner cavity of a PI CC catheter, a real liquid channel is simulated, the first sterile alligator clip is arranged outside the steel needle head, and the medical instrument is simulated. And signal conduction is realized by combining a transmission line and a sterile alligator clip II, and a simulation electric path from the tip of the catheter to a monitoring system is constructed, so that the dynamic change of the P wave is visually presented.

Description

Technical Field

[0001] This invention belongs to the technical field of electrocardiogram positioning demonstration teaching aids, specifically a PICC intracavitary electrocardiogram positioning operation demonstration mold. Background Technology

[0002] PICC intracardiac electrocardiography localization is a technique used during the insertion of a peripherally inserted central venous catheter (PICC). It involves collecting electrocardiographic signals transmitted via the catheter guidewire or the catheter itself as electrodes, and monitoring P-wave morphology changes in real time to determine whether the catheter tip has reached the superior vena cava. As the catheter tip gradually approaches and enters the superior vena cava, electrical activity near the right atrium increases, resulting in a significant increase in P-wave amplitude, forming a characteristic change. Based on this, the operator can accurately determine the catheter's placement, avoiding complications caused by excessively deep or shallow placement. This technique has advantages such as real-time accuracy and no need for radiological imaging support, and is widely used in clinical practice, especially in situations where intraoperative or bedside X-ray examination is not immediately possible. It not only improves the safety and success rate of catheter placement but also effectively reduces the pain and radiation exposure suffered by patients due to repeated catheter position adjustments.

[0003] Currently, students typically learn the principles of PICC placement and ECG localization mechanisms in the classroom through textual explanations, PPT illustrations, or videos. Before establishing operational knowledge, they are instilled with abstract concepts, such as the relationship between the catheter tip and atrial electrical activity, and the P wave variation pattern. Due to the lack of physical teaching aids that can simultaneously demonstrate the catheter's path and simulate the dynamic response of ECG signals during the theoretical stage, students find it difficult to effectively connect two-dimensional images with three-dimensional human anatomy and electrophysiological changes, easily leading to misunderstandings and cognitive confusion. When they enter the subsequent simulation training stage, due to the weak foundation in the early stages, problems such as chaotic operation steps, misjudgments, and lack of coordination often occur, resulting in low training efficiency and a significant reduction in teaching effectiveness. More seriously, this teaching model that disconnects theory from practice prolongs the learning curve, weakens students' self-confidence and initiative, and fails to meet the needs of the rapid growth of high-quality nursing professionals.

[0004] To address the problems raised in the background art, those skilled in the art have proposed an operational demonstration mold for PICC intracavitary electrocardiogram localization. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides an operational demonstration mold for PICC intracavitary electrocardiogram (ECG) localization. This addresses the issue that in the current technology, students primarily learn PICC ECG localization through theoretical lectures. However, due to the lack of physical teaching aids that can simultaneously demonstrate catheter movement and ECG signal changes, it is difficult to establish spatial and physiological cognition, leading to comprehension difficulties. Consequently, students are prone to operational confusion and misjudgment during practical training. This disconnect between teaching and learning affects learning efficiency, prolongs the mastery period, and hinders the cultivation of high-quality nursing talent.

[0006] An operational demonstration mold for PICC intracavitary electrocardiogram positioning includes a folder plate one, an infusion bag is provided on one side of the folder plate one, an infusion set is fixedly connected to one side of the infusion bag, a steel needle is fixedly connected to one end of the infusion set, a folder plate two is provided on one side of the folder plate one, a PICC catheter is provided on one side of the folder plate two, a heparin cap is fixedly connected to one end of the PICC catheter, one end of the steel needle extends through one side of the heparin cap to the inner cavity of the heparin cap, and a sterile alligator clip one is fitted around the outer ring of the steel needle;

[0007] A multi-function signal line is provided on one side of the folder board, and one end of the multi-function signal line is fixedly connected to a right upper limb lead clip. A sterile alligator clip two is snapped into the inner cavity of the right upper limb lead clip. A transmission line is provided between the sterile alligator clip two and the sterile alligator clip one. An ECG patch mechanism is provided on one side of the multi-function signal line, and the ECG patch mechanism includes two limb lead clips. One end of the limb lead clip is fixedly connected to a connecting line, and one end of the connecting line is fixedly connected to one end of the adjacent multi-function signal line.

[0008] Preferably, the inner cavity of the limb lead clip is provided with an electrode plate, and the output end of the electrode plate is engaged with the inner surface wall of the corresponding limb lead clip.

[0009] Preferably, the inner cavity of the infusion bag, the inner cavity of the infusion set, and the inner cavity of the steel needle are interconnected.

[0010] Preferably, the inner lumen of the steel needle is connected to the inner lumen of the heparin cap, and the inner lumen of the heparin cap is connected to the inner lumen of the PICC catheter.

[0011] Preferably, the outer wall of the steel needle is in contact with the inner wall of the sterile alligator clip.

[0012] Preferably, one end of the transmission line is fixedly connected to the output end of sterile alligator clip one, and the other end of the transmission line is fixedly connected to the output end of sterile alligator clip two.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention addresses the problem of the disconnect between theory and practice in existing teaching methods, and the difficulty for students to understand the relationship between catheter movement and electrocardiogram signals. It uses two folder boards to display a monitor and an anatomical diagram of the human body, establishing an intuitive spatial correspondence and helping students develop a clear structural understanding before practical training. The infusion bag, infusion set, steel needle, heparin cap, and PICC catheter lumen are connected, simulating a real fluid pathway. A sterile alligator clip is attached to the steel needle, and combined with a transmission line and a second sterile alligator clip, signal transmission is achieved, constructing a simulated electrical pathway from the catheter tip to the monitoring system. This allows for the visualization of P-wave dynamics. A multi-in-one signal line, right upper limb lead clip, limb lead clip, and electrode pads replicate clinical lead connections, improving operational standardization. The device can be used simultaneously during theoretical teaching, effectively reducing misunderstandings caused by abstract explanations, lowering the operational error rate in subsequent practical training, improving learning efficiency and confidence, and achieving integrated theory and practice teaching. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a schematic diagram of the second structure of the folder board of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the sterile alligator clip of the present invention;

[0018] Figure 4 For the present invention Figure 2 Enlarged view of point A in the image;

[0019] Figure 5 This is an anatomical diagram of the human body placed on the folder board of the present invention.

[0020] Figure 6 This is a diagram of the monitoring device placed on the folder board of the present invention;

[0021] Figure 7 This is a schematic diagram of the bonding area of ​​the electrode sheet of the present invention;

[0022] Figure 8 This is a P-wave floating diagram of the intracardiac electrocardiogram of the present invention.

[0023] In the diagram: 1. Folder board one; 2. Folder board two; 3. Infusion set; 4. PICC catheter; 5. Sterile alligator clip one; 6. Transmission line; 7. Sterile alligator clip two; 8. Right upper limb lead clip; 9. Multi-function signal line; 10. Steel needle; 11. Infusion bag; 12. Heparin cap; 13. ECG patch mechanism; 1301. Connecting line; 1302. Limb lead clip; 1303. Electrode pad. Detailed Implementation

[0024] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0025] As attached Figure 1 To be continued Figure 4 As shown:

[0026] Example 1: This invention provides an operational demonstration mold for PICC intracavitary electrocardiogram positioning, including a folder plate 1, an infusion bag 11 is provided on one side of the folder plate 1, an infusion set 3 is fixedly connected to one side of the infusion bag 11, a steel needle 10 is fixedly connected to one end of the infusion set 3, a folder plate 2 is provided on one side of the folder plate 1, a PICC catheter 4 is provided on one side of the folder plate 2, a heparin cap 12 is fixedly connected to one end of the PICC catheter 4, one end of the steel needle 10 extends through one side of the heparin cap 12 to the inner cavity of the heparin cap 12, and a sterile alligator clip 5 is fitted around the outer ring of the steel needle 10;

[0027] A multi-function signal line 9 is provided on one side of the folder board 1, and one end of the multi-function signal line 9 is fixedly connected to a right upper limb lead clip 8. A sterile alligator clip 2 7 is snapped into the inner cavity of the right upper limb lead clip 8. A transmission line 6 is provided between the sterile alligator clip 2 7 and the sterile alligator clip 1 5. An ECG patch mechanism 13 is provided on one side of the multi-function signal line 9, and the ECG patch mechanism 13 includes two limb lead clips 1302. One end of the limb lead clip 1302 is fixedly connected to a connecting line 1301, and one end of the connecting line 1301 is fixedly connected to one end of the adjacent multi-function signal line 9.

[0028] As can be seen from the above, in the actual teaching process, the display diagram of the desktop bedside ECG monitor is first placed in folder 1, and the display diagram of the human heart anatomy and the course of the basilic vein is placed in folder 2, forming a left-right corresponding teaching visual layout. Then, the multi-in-one signal cable 9 is placed at the corresponding interface position of the monitor display diagram on folder 1, simulating the connection state of the monitoring equipment in clinical practice. The two limb lead clips 1302 are respectively attached to the designated area of ​​the heart surface projection on the display diagram on folder 2 through the electrode pads 1303 that are snapped into their cavities, so as to achieve accurate positioning of the lead electrodes. Then, the right upper limb lead clip 8 is snapped into the sterile alligator clip 7, so that the lead signal can be transmitted. At this point, the infusion bag 11 is suspended at an appropriate height, allowing the 0.9% sodium chloride solution inside to flow through the infusion set 3 to the steel needle 10 under gravity. After the infusion set 3 and the infusion bag 11 are connected, the steel needle 10 pierces the inner lumen of the heparin cap 12. The heparin cap 12 is fixedly connected to one end of the PICC catheter 4, and the inner lumens of the three are sequentially connected, forming a complete fluid pathway, simulating the clinical scenario of infusion via catheter. The PICC catheter 4 has a metal guidewire inside, which passes through the inner lumen of the catheter and can be pushed forward with the catheter. Its distal end is close to the catheter tip, and its proximal end extends through the heparin cap 12 and forms an electrical connection with the steel needle 10. During the insertion process, the sterile alligator clips 5 and 7, which are fitted around the outer ring of the steel needle 10, are electrically connected via the transmission line 6. This allows the ECG signal collected by the catheter tip, carrying the metal guidewire, near the superior vena cava to be transmitted through the metal guidewire, heparin cap 12, and steel needle 10 to the sterile alligator clip 5, then through the transmission line 6 to the sterile alligator clip 7. Finally, the simulated lead II ECG signal is transmitted to the monitor display image via the multi-signal line 9 and the limb lead clip 1302, enabling a visual demonstration of the dynamic changes of the P wave. When the catheter tip approaches the superior vena cava, the P wave gradually rises and becomes peaked until it is close to the amplitude of the QRS wave, indicating that the catheter has reached its position. At this point, insertion is stopped, and the positioning process is simulated. Subsequently, the follow-up procedures, such as guidewire withdrawal, catheter position adjustment by 1-2 cm, and catheter fixation, can be explained and demonstrated. The entire process, through structured component connections and physical pathway simulation, realistically reproduces the operation sequence and signal feedback mechanism of ultrasound-guided combined intracavitary electrocardiogram localization technology in clinical practice.

[0029] This solution addresses the technical challenge of students lacking intuitive teaching aids and struggling to understand the relationship between catheter movement and ECG signals during the theoretical learning phase in current educational programs. By using folder board 1 (1) and folder board 2 (2) to respectively display monitoring equipment and anatomical diagrams, a correspondence between theory and visual representation is established. This allows trainees to build a spatial cognitive framework before encountering mannequins or real patients, effectively mitigating comprehension biases caused by abstract explanations. The internal connectivity design between the infusion bag 11, infusion set 3, steel needle 10, heparin cap 12, and PICC catheter 4, combined with the internal metal guidewire, simulates a real fluid pathway and electrical signal conduction path. The steel needle 10 serves not only as a structural connection point but also as an interface for ECG signal output. The fit between sterile alligator clip 5 and the outer wall of the steel needle 10, and the conductivity between transmission line 6 and sterile alligator clip 7, enables the connection from the catheter... The simulation of the complete electrical path from the metal guidewire at the tube tip to the monitoring signal output solves the technical bottleneck of traditional teaching methods that cannot dynamically demonstrate P wave changes. The combination of the multi-in-one signal line 9 with the right upper limb lead clip 8, limb lead clip 1302, and electrode pads 1303 replicates the clinical lead connection method, enabling trainees to accurately grasp the placement of each lead and the signal acquisition principle, avoiding problems such as incorrect lead connection and improper electrode placement in subsequent practical operations. The entire device can be used during the theoretical teaching stage, helping trainees establish a clear understanding of operational logic and physiological feedback before entering simulated training. This significantly reduces operational confusion, judgment errors, and lack of coordination caused by weak foundational knowledge, improves teaching continuity and learning efficiency, shortens the learning curve, enhances trainees' operational confidence and initiative, and makes up for the shortcomings of the traditional lecture-then-practice model where theory and practice are disconnected.

[0030] Example 2: This example is basically the same as the previous example, except that an electrode plate 1303 is provided in the inner cavity of the limb lead clip 1302, and the output end of the electrode plate 1303 is engaged with the inner wall of the corresponding limb lead clip 1302.

[0031] The inner cavity of the infusion bag 11, the inner cavity of the infusion set 3, and the inner cavity of the steel needle 10 are interconnected.

[0032] The inner lumen of the steel needle 10 is connected to the inner lumen of the heparin cap 12, and the inner lumen of the heparin cap 12 is connected to the inner lumen of the PICC catheter 4.

[0033] The outer wall of the steel needle 10 is in contact with the inner wall of the sterile alligator clip 5.

[0034] One end of the transmission line 6 is fixedly connected to the output end of the sterile alligator clip 5, and the other end of the transmission line 6 is fixedly connected to the output end of the sterile alligator clip 7.

[0035] As can be seen from the above, the electrode pad 1303 is installed inside the limb lead clip 1302, and the output end of the electrode pad 1303 is engaged with the inner wall of the corresponding limb lead clip 1302. This design ensures that the electrode pad 1303 is stably fixed inside the lead clip during use, preventing loosening or poor contact, and ensuring continuous and reliable transmission of simulated electrocardiogram signals. This achieves the effect of improving the stability of lead connection and the authenticity of signal transmission. Furthermore, the interconnected design of the inner cavities of the infusion bag 11, the infusion set 3, and the steel needle 10 further enhances this effect. In teaching demonstrations, the flow of fluids such as saline in the catheter pathway can be simulated, forming a complete fluid channel. This allows trainees to intuitively understand the principle of the shared path between the infusion pathway and the ECG signal acquisition pathway, achieving the effect of recreating the actual clinical infusion environment and supporting simulated signal transmission. By connecting the inner lumen of the steel needle 10 to the inner lumen of the heparin cap 12, and further connecting the inner lumen of the heparin cap 12 to the inner lumen of the PICC catheter 4, a continuous pathway from the external infusion device to the internal catheter is constructed, simulating fluid flow during catheter use. The actual path of the guidewire push enhances structural connectivity and operational realism, facilitating trainees' understanding of the connections between components. The outer wall of the steel needle 10 fits snugly against the inner wall of the sterile alligator clip 5, ensuring a stable electrical contact interface. This allows the simulated ECG signal to be effectively transmitted to the external circuit via the steel needle 10, improving the reliability of signal acquisition and connection strength. The transmission line 6 is fixedly connected at one end to the output of the sterile alligator clip 5 and at the other end to the output of the sterile alligator clip 7, achieving a complete electrical pathway from the puncture site to the monitoring signal receiver. This allows the simulated ECG signal to be transmitted via the catheter, steel needle 10, alligator clip, and transmission line 6 to the multi-in-one signal line 9, constructing a complete signal transmission link and realistically reproducing the intracavitary ECG localization principle. Folder 1 and Folder 2 can be combined to form a book-like structure, facilitating easy page turning.

[0036] Example 2:

[0037] As attached Figure 8 As shown:

[0038] 1. As the catheter is slowly inserted into the SVC, the amplitude of the P wave on the intracardiac electrocardiogram gradually becomes higher and peaked;

[0039] 2. Continue catheter insertion; intracardiac electrocardiogram shows maximum P wave amplitude;

[0040] 3. Continue inserting the catheter. When the intracardiac electrocardiogram shows biphasic P waves, record the electrocardiogram.

[0041] 4. Retract the catheter until the P wave reaches its maximum amplitude, then retract it another 0.5–1 cm to confirm the catheter position and record an electrocardiogram.

[0042] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An operational demonstration mold for PICC intracavitary electrocardiographic positioning, comprising a folder plate one (1), characterized in that: The side of the folder plate one (1) is provided with an infusion bag (11), one side of the infusion bag (11) is fixedly connected with an infusion device (3), one end of the infusion device (3) is fixedly connected with a steel needle head (10), one side of the folder plate one (1) is provided with a folder plate two (2), one side of the folder plate two (2) is provided with a PICC catheter (4), one end of the PICC catheter (4) is fixedly connected with a heparin cap (12), one end of the steel needle head (10) extends to the inner cavity of the heparin cap (12) through the side of the heparin cap (12), and the outer circle of the steel needle head (10) is sleeved with a sterile alligator clip one (5). The upper side of the folder plate one (1) is provided with a multi-in-one signal line (9), one end of the multi-in-one signal line (9) is fixedly connected with a right upper limb lead clip (8), the inner cavity of the right upper limb lead clip (8) is clamped with a sterile alligator clip two (7), a transmission line (6) is arranged between the sterile alligator clip two (7) and the sterile alligator clip one (5), one side of the multi-in-one signal line (9) is provided with an electrocardiogram patch mechanism (13), and the electrocardiogram patch mechanism (13) comprises two limb lead clips (1302), one end of the limb lead clip (1302) is fixedly connected with a connecting line (1301), and one end of the connecting line (1301) is fixedly connected with one end of the adjacent multi-in-one signal line (9).

2. The PICC intracavitary electrocardiography positioning operation demonstration mold according to claim 1, characterized in that: The inner cavity of the limb lead clip (1302) is provided with an electrode patch (1303), and the output end of the electrode patch (1303) is clamped with the inner surface wall of the corresponding limb lead clip (1302).

3. The PICC intracavitary electrocardiography positioning operation demonstration mold according to claim 1, characterized in that: The inner cavities of the infusion bag (11), the infusion device (3) and the steel needle head (10) are communicated with each other.

4. The PICC intracavitary electrocardiography positioning operation demonstration mold according to claim 1, characterized in that: The inner cavity of the steel needle head (10) is communicated with the inner cavity of the heparin cap (12), and the inner cavity of the heparin cap (12) is communicated with the inner cavity of the PICC catheter (4).

5. The PICC intraluminal electrocardiogram positioning operation demonstration mold according to claim 1, characterized in that: The outer surface wall of the steel needle head (10) is matched with the inner surface wall of the sterile alligator clip one (5).

6. The PICC intraluminal electrocardiogram positioning operation demonstration mold according to claim 1, characterized in that: One end of the transmission line (6) is fixedly connected with the output end of the sterile alligator clip one (5), and the other end of the transmission line (6) is fixedly connected with the output end of the sterile alligator clip two (7).

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