Dry pericardial puncture device

Abstract

The utility model relates to medical instrument technical field especially, and more particularly relates to a dry pericardium puncture device. Including sleeve, puncture needle and puncture guide wire, sleeve includes the outer tube and inner tube of two end opening, the outer tube is equipped on the inner tube, the inner tube can slide in the outer tube, one end of the inner tube is fixed with negative pressure sucking disc, and the middle part of negative pressure sucking disc is open and communicates with the inner tube, and negative pressure sucking disc can contract to the outer tube, and the one end away from negative pressure sucking disc of outer tube is fixed with sealing sleeve, and puncture needle is located in the inner tube through sealing sleeve, and puncture guide wire is arranged in puncture needle, and the outside of outer tube is connected with negative pressure pipe, and the end of negative pressure pipe is connected to the vacuumizing equipment outside, and the side wall of inner tube is provided with through slot, and negative pressure pipe communicates with the inner tube through through slot. The wall layer of pericardium puncture part is adsorbed by the negative pressure sucking disc set in the front end of needle cover, avoids the error of puncture needle, and improves the security of dry pericardium puncture.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a dry pericardiocentesis device. Background Technology

[0002] Dry pericardiocentesis refers to a puncture procedure performed in the absence of pericardial effusion or with only a small amount of fluid. It is mainly used to establish an epicardial access in order to map and ablate arrhythmias originating from or passing through the epicardium (such as ventricular tachycardia, atrial tachycardia, etc.).

[0003] In dry pericardiocentesis, because there is no pericardial effusion, the coronary arteries and myocardium are close to the pericardium. In the past, the tough pericardium was usually punctured directly with a puncture needle. However, during a continuous heartbeat, direct use of the puncture needle is prone to accidental puncture, which can lead to complications such as cardiac tamponade and endanger the patient's life. Summary of the Invention

[0004] To address the problem of accidental puncture when directly using a puncture needle to puncture the tough pericardium, this invention proposes a dry pericardial puncture device. By using a negative pressure suction cup at the front end of the needle sheath to adhere to the pericardial wall layer at the puncture site, accidental puncture by the puncture needle is avoided, thus improving the safety of dry pericardial puncture.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows: A dry pericardiocentesis device includes a cannula, a puncture needle, and a puncture guidewire. The cannula comprises an outer cylinder and an inner cylinder, both open at both ends. The outer cylinder is fitted onto the inner cylinder, and the inner cylinder can slide within the outer cylinder. A negative pressure suction cup is fixed to one end of the inner cylinder, with an opening in the middle that communicates with the inner cylinder. The negative pressure suction cup can retract into the outer cylinder. A sealing sleeve is fixed to the end of the outer cylinder away from the negative pressure suction cup. The puncture needle passes through the sealing sleeve and is positioned within the inner cylinder. The puncture guidewire passes through the puncture needle. A negative pressure tube is connected to the outer side of the outer cylinder, and its end is connected to an external vacuum device. A through groove is formed on the side wall of the inner cylinder, through which the negative pressure tube communicates with the inner cylinder. The negative pressure suction cup is an elastic body; it is closed when the inner cylinder enters the outer cylinder and can open directly when it extends out of the outer cylinder due to its elasticity.

[0006] Preferably, a limiting part is fixed at the end of the puncture needle away from its tip. The limiting part has a through hole communicating with the puncture needle, and the outer diameter of the limiting part is larger than the inner diameter of the sealing kit. This prevents the puncture needle from being completely submerged in the inner cylinder, thus avoiding safety hazards during puncture.

[0007] Preferably, the puncture tip of the guidewire is J-shaped. The J-shaped puncture tip reduces the risk of damage to the artery or myocardium, thus reducing treatment risks.

[0008] Preferably, the inner side of the outer cylinder is provided with a sliding groove, and the outer side of the inner cylinder is provided with a slider that cooperates with the sliding groove. The cooperation between the sliding groove and the slider can also limit the movement of the inner cylinder in the outer cylinder, preventing the inner cylinder from directly detaching from the outer cylinder.

[0009] Preferably, a slot is provided on the outer side of the inner cylinder, and a spring is fixed between the end of the slider near the slot and the side wall of the slot.

[0010] Preferably, a connecting pipe is fixed at the opening in the middle of the negative pressure suction cup, and the connecting pipe is connected and fixed to the end of the inner cylinder.

[0011] Preferably, the negative pressure suction cup extends out of the outer cylinder in a trumpet shape.

[0012] Preferably, the sealing kit is fitted onto the outside of the outer cylinder and threadedly connected to the outer cylinder.

[0013] The beneficial effects of this utility model through the above technical solution are as follows: 1. In this invention, when the negative pressure suction cup at the end of the inner cylinder contacts the pericardial wall, under the action of the external vacuum device, the negative pressure suction cup adheres to the pericardial wall, causing the pericardial wall at that location to form a "tent-shaped" bulge, separating the pericardium from the heart and creating a safe puncture space. The puncture needle can then be slowly advanced through the bulge, and the puncture guidewire can be inserted into the puncture needle to enter the pericardial cavity, completing dry pericardiocentesis. During this process, the position where the negative pressure suction cup adheres to the pericardial wall can be selected multiple times before puncturing the puncture needle and puncture guidewire, avoiding accidental puncture and improving the safety of dry pericardiocentesis.

[0014] 2. The negative pressure suction cup in this invention can be retracted into the outer cylinder to avoid positional interference between the outer and inner cylinders when they pass through the channel sheath established on the chest wall, which would affect subsequent punctures.

[0015] 3. The puncture segment of the guidewire in this invention is J-shaped, which reduces the risk of damage to arteries or myocardium and lowers the treatment risk. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a dry pericardiocentesis device according to the present invention; Figure 2 This utility model relates to a dry pericardiocentesis device. Figure 1 Enlarged view of the structure at point A in the middle; Figure 3 This is a schematic diagram of the structure of the negative pressure suction cup of the dry pericardiocentesis device of this utility model retracting into the outer cylinder.

[0017] In the attached diagram, the following numbers are used: 1 is the cannula, 2 is the puncture needle, 3 is the puncture guide wire, 11 is the outer cylinder, 12 is the inner cylinder, 13 is the negative pressure suction cup, 14 is the sealing kit, 15 is the negative pressure tube, 16 is the through groove, 17 is the sliding groove, 18 is the slider, 19 is the slot, 131 is the connecting tube, and 191 is the spring. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1-3 As shown, this embodiment provides a dry pericardiocentesis device, including a cannula 1, a puncture needle 2, and a puncture guidewire 3; refer to Figure 1 The sleeve 1 includes an outer cylinder 11 and an inner cylinder 12, both open at both ends. The outer circumference of the outer cylinder 11 is 12F (12mm). The outer cylinder 11 is fitted onto the inner cylinder 12, and the inner cylinder 12 can slide within the outer cylinder 11. In this embodiment, refer to... Figure 2 The outer cylinder 11 has a groove 17 on its inner side, and the inner cylinder 12 has a slider 18 on its outer side that mates with the groove 17. The outer side of the inner cylinder 12 has a slot 19, and a spring 191 is fixed between the end of the slider 18 near the slot 19 and the side wall of the slot 19. As the inner cylinder 12 extends into the outer cylinder 11, the slider 18 first retracts into the slot 19, and then the slider 18 extends into the groove 17 under the action of the spring 191.

[0019] Furthermore, a negative pressure suction cup 13 is fixed to one end of the inner cylinder 11. The negative pressure suction cup 13 has an opening in the middle and communicates with the inner cylinder 11. A connecting pipe 131 is glued and fixed to the opening in the middle of the negative pressure suction cup 13. The connecting pipe 131 is welded and fixed to the end of the inner cylinder 12. The negative pressure suction cup 13 can be retracted into the outer cylinder 11. The negative pressure suction cup 13 is made of silicone or rubber and is an elastomer. When it is retracted into the outer cylinder 11, it is in a closed state. When the negative pressure suction cup 13 extends out of the outer cylinder 11, it is in a trumpet shape. A sealing kit 14 is fixed to the end of the outer cylinder 11 away from the negative pressure suction cup 13. The sealing kit 14 has an opening in the middle for the puncture needle 2 to pass through. The sealing kit 14 is sleeved on the outside of the outer cylinder 11 and threadedly connected to the outer cylinder 11.

[0020] refer to Figure 1 The outer cylinder 11 is connected to a negative pressure pipe 15 on its outer side, and the end of the negative pressure pipe 15 is connected to an external vacuuming device. A through groove 16 is provided on the side wall of the inner cylinder 12, and the negative pressure pipe 15 and the inner cylinder 12 are connected through the through groove 16. In this embodiment, the vacuuming device is a miniature electric vacuum pump, which is purchased. The miniature electric vacuum pump evacuates air from the negative pressure pipe 15 when it is started. The through groove 16 is longer than the connection opening between the negative pressure pipe 15 and the outer cylinder 11 to prevent misalignment of the inner cylinder 12 when it slides within the outer cylinder 11, which would prevent the negative pressure pipe 15 from connecting with the inner cylinder 12.

[0021] The puncture needle 2 passes through the opening in the middle of the sealing kit 14 and is located in the inner cylinder 12. The puncture guide wire 3 passes through the puncture needle 2. A limiting part 21 is fixed to the end of the puncture needle 2 away from its tip. The limiting part 21 has a through hole that communicates with the puncture needle 2. The outer diameter of the limiting part 21 is larger than the inner diameter of the sealing kit 14 to prevent the puncture needle 2 from being completely submerged in the inner cylinder 12, thus avoiding safety hazards during puncture. The puncture end of the puncture guide wire 3 is J-shaped and is a blunt end without a sharp point, reducing the risk of damage to arteries or myocardium.

[0022] When using this device, firstly, a channel is established in the chest wall, and a 22F (22mm circumference) outer sheath is placed in the chest wall. After the negative pressure suction cup 13 at the end of the inner cylinder 12 is retracted into the outer cylinder 11, it extends into the outer sheath (e.g., Figure 3 As shown), after the outer cylinder 11 passes through the outer sheath, the negative pressure suction cup 13 at the end of the inner cylinder 12 extends out of the outer cylinder 11. At this time, the negative pressure suction cup 13 unfolds, and then the sealing kit 14 is fitted onto the outside of the outer cylinder 11 and screwed together. At this time, the position of the inner cylinder 12 in the outer cylinder 11 is fixed (as shown). Figure 2 Insert the puncture needle 2 into the inner cylinder 12 through the middle opening of the sealing kit 14 (do not insert or remove it for puncture, only use it to block the opening of the sealing kit 14). When the surface of the negative pressure suction cup 13 contacts the pericardial wall, turn on the miniature electric vacuum pump connected to the negative pressure tube 15. The negative pressure suction cup 13 will adhere to the pericardial wall, making the pericardial wall at that location form a "tent-shaped" bulge (3-5mm high). At this time, the puncture needle 2 can be slowly pushed into the bulge. Stop when you feel a breakthrough. Then, insert the puncture guide wire 3 into the puncture needle 2 and enter the pericardial cavity to complete the dry pericardial puncture.

[0023] The embodiments described above are merely preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the patent claims of this utility model should be included within the scope of the patent application of this utility model.

Claims

1. A dry pericardiocentesis device, characterized in that, The device includes a cannula (1), a puncture needle (2), and a puncture guide wire (3). The cannula (1) includes an outer cylinder (11) with openings at both ends and an inner cylinder (12). The outer cylinder (11) is fitted onto the inner cylinder (12), and the inner cylinder (12) can slide in the outer cylinder (11). A negative pressure suction cup (13) is fixed to one end of the inner cylinder (12). The negative pressure suction cup (13) has an opening in the middle and communicates with the inner cylinder (12). The negative pressure suction cup (13) can retract into the outer cylinder (11). A sealing kit (14) is fixed to the end of the outer cylinder (11) away from the negative pressure suction cup (13). The puncture needle (2) passes through the sealing kit (14) and is located in the inner cylinder (12). The puncture guide wire (3) passes through the puncture needle (2). The outer side of the outer cylinder (11) is connected to a negative pressure tube (15). The end of the negative pressure tube (15) is connected to an external vacuum device. A through groove (16) is provided on the side wall of the inner cylinder (12). The negative pressure tube (15) and the inner cylinder (12) are connected through the through groove (16).

2. The dry pericardiocentesis device according to claim 1, characterized in that, The end of the puncture needle (2) away from its tip is fixed with a limiting part (21). The limiting part (21) has a through hole that communicates with the puncture needle (2). The outer diameter of the limiting part (21) is larger than the inner diameter of the sealing kit (14).

3. The dry pericardiocentesis device according to claim 1, characterized in that, The puncture end of the guidewire (3) is J-shaped.

4. The dry pericardiocentesis device according to claim 1, characterized in that, The outer cylinder (11) has a groove (17) on its inner side, and the inner cylinder (12) has a slider (18) on its outer side that cooperates with the groove (17).

5. The dry pericardiocentesis device according to claim 4, characterized in that, The inner cylinder (12) has a slot (19) on its outer side, and a spring (191) is fixed between the end of the slider (18) near the slot (19) and the side wall of the slot (19).

6. The dry pericardiocentesis device according to claim 1, characterized in that, A connecting pipe (131) is fixed at the opening in the middle of the negative pressure suction cup (13), and the connecting pipe (131) is connected and fixed to the end of the inner cylinder (12).

7. The dry pericardiocentesis device according to claim 1, characterized in that, The negative pressure suction cup (13) extends out of the outer cylinder (11) in a trumpet shape.

8. The dry pericardiocentesis device according to claim 1, characterized in that, The sealing kit (14) is fitted onto the outside of the outer cylinder (11) and threadedly connected to the outer cylinder (11).

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