Closed thoracic drainage tube

Abstract

The invention provides a thoracic cavity closed drainage tube which comprises a drainage tube body and further comprises a guide wire tube. The guide wire tube is fixedly arranged outside the drainage tube, and the end, placed in the chest, of the guide wire tube is a closed blind end. The guide wire tube with the far end being the closed blind end is fixedly arranged outside the drainage tube, and the cooperation mode of the guide wire and the drainage tube is reconstructed. According to the structure, the guide wire only needs to be inserted into the independent guide wire tube from the outside and limited in the independent guide wire tube in the tube indwelling operation process, the whole-course and stable external support with the fixed track is provided for the drainage tube, and therefore the stability and accuracy of the tube indwelling process are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a closed chest drainage tube. Background Technology

[0002] In the field of closed thoracic drainage, to reduce patient discomfort and achieve minimally invasive procedures, guidewire-guided catheter placement has been adopted in clinical practice to replace traditional ovum forceps-assisted placement. For example, Chinese invention patent CN204951738U discloses a "disposable thoracic drainage tube," which involves connecting a guidewire to the end of a puncture needle, then placing the drainage tube over the guidewire, and using the guidewire to guide the tube into the thoracic cavity. While this method avoids excessive expansion of the surgical incision caused by forceps, it still has inherent drawbacks: its core relies on a separate guidewire temporarily inserted into the body from outside during the procedure for guidance, and the guidewire must be completely withdrawn from the patient after the operation. This process results in a long path for the guidewire within the body, without a fixed trajectory, which not only increases the potential risk of damaging intrathoracic tissues, but also, as an independent instrument, the depth and stability of the guidewire's insertion depend entirely on the surgeon's feel, introducing uncertainty and potentially affecting the accuracy and safety of the placement. That is, before the guidewire is withdrawn, the pleural effusion flowing out of the drainage tube is likely to contaminate the surgical area.

[0003] Further analysis revealed that the shortcomings of the aforementioned and similar guidewire-guided technologies stem from the physical separation of the "guiding structure" and the "drainage structure." Whether using traditional internal guidewires or external guidewires as represented by CN204951738U, the guidewire must be partially or completely inserted into the body cavity before fulfilling its guiding function. This fundamentally fails to completely resolve the risks of tissue damage and operational complexity caused by the "intrusion of the guide material into the body." Therefore, an innovative drainage catheter design is urgently needed that integrates the guiding function into the catheter body and allows the guiding process to be completely controllable externally. This would achieve convenient and stable support while eliminating unnecessary contact and damage to the body cavity caused by the guiding element. Summary of the Invention

[0004] This invention proposes a closed thoracic drainage tube, which solves the technical problems of tissue damage caused by the shared or independent passage of the guidewire and drainage channel during the traditional guidewire-guided tube placement process, as well as premature leakage of pleural effusion before the tube placement is completed.

[0005] The technical solution of this invention is implemented as follows:

[0006] A closed thoracic drainage tube includes a drainage tube and a guidewire; the guidewire is fixedly disposed outside the drainage tube, and its end inserted into the thoracic cavity is a closed blind end.

[0007] Furthermore, the guide wire is attached to the outer wall of the drainage tube and is arranged in parallel with the drainage tube.

[0008] Furthermore, the blind end of the guidewire does not extend axially beyond the distal end face of the drainage tube used for drainage.

[0009] Furthermore, there is an axial gap between the blind end and the distal end face of the drainage tube.

[0010] Furthermore, a sensing element is integrated at the blind end of the guide wire.

[0011] Furthermore, the inner wall of the guide wire is provided with a friction-reducing layer.

[0012] Furthermore, at least one side opening is provided on the wall of the drainage tube in the section near its distal end.

[0013] Furthermore, the proximal end of the drainage tube is provided with a drainage port for connecting to an external drainage device.

[0014] The beneficial effects of the technical solution provided in this application are as follows:

[0015] 1. This application reconstructs the collaboration between the guidewire and the drainage tube by fixing a guidewire with a closed blind end externally to the drainage tube. This structure allows the guidewire to be inserted externally and confined within this independent guidewire tube during the placement procedure, providing stable and consistent external support for the drainage tube throughout its entire length, thus ensuring a smooth and precise placement process. Simultaneously, because the guidewire and drainage tube are completely independent and their distal ends are closed, the guiding and drainage functions are successfully separated physically. This not only completely avoids the thorny problem of premature leakage of pleural effusion during placement caused by the shared channel between the guidewire and drainage cavity in traditional internal guidewire methods, but also eliminates the risk of accidental damage to intracavitary tissues caused by an external independent guidewire, enabling safe and clean minimally invasive placement without the need for any guiding elements to invade the body cavity.

[0016] 2. This application enhances the integrity and structural strength of the catheter by specifically designing the guidewire to be attached to and parallel to the outer wall of the drainage tube, making the insertion operation smoother and more stable. The design of the blind end of the guidewire not extending axially beyond the distal end face of the drainage tube ensures that the rigid blind end structure will not become a new point of tissue damage at the end of the guidance process; while maintaining a certain axial distance between it and the end face of the drainage tube further increases the safety buffer of the operation. The anti-friction layer on the inner wall of the guidewire significantly reduces the friction during guidewire insertion and retraction, improving the smoothness and feel of the operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the closed thoracic drainage tube structure of the present invention.

[0019] In the diagram: 1. Drainage tube, 2. Guide wire tube, 3. Drainage port, 4. Side inlet, 5. Blind end. Detailed Implementation

[0020] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention relates to a closed chest drainage tube, the core improvement of which lies in the addition of an independent guidewire to optimize the placement procedure of traditional closed chest drainage. For example... Figure 1 As shown, the catheter mainly consists of a drainage tube 1 and a guidewire 2 fixedly installed externally. The drainage tube 1 is made of medical-grade flexible material, with a standard drainage interface 3 at its proximal end for connecting a negative pressure drainage bottle or drainage bag, and a drainage end at its distal end for drainage into the pleural cavity. The guidewire 2 is also made of medical material, and its key feature is that it is not a temporarily inserted independent instrument, but a component that is permanently fixed to the body of the drainage tube 1 beforehand.

[0022] Specifically, the guidewire 2 is attached to the outer wall of the drainage tube 1 in a parallel manner. The two can be integrally formed by co-extrusion, or firmly bonded together by medical adhesives or thermoforming welding, forming a unified structural unit. The inner lumen of the guidewire 2 is completely isolated from the inner lumen of the drainage tube 1, and they do not communicate with each other. The proximal end of the guidewire 2 is open, forming an inlet for guidewire insertion; its distal end is a closed blind end 5. This blind end 5 terminates axially near the drainage end of the drainage tube 1, and preferably does not extend beyond the distal end face of the drainage tube 1. More preferably, the blind end 5 maintains an axial distance of a few millimeters from the distal end face of the drainage tube 1. This design ensures that the guidewire 2 provides sufficient support length for the drainage tube 1, while the blind end 5, made of the same soft material as the guidewire 2 and the drainage tube 1, does not protrude beyond the drainage tube 1 after placement, thus avoiding additional irritation or damage to the intrathoracic tissues.

[0023] In practice, the surgeon first inserts a guidewire with a certain degree of rigidity through the proximal opening of the guidewire tube 2. Because the distal end of the guidewire tube 2 is sealed by the blind end 5, the guidewire is blocked at the blind end 5, naturally limiting its insertion depth and fundamentally eliminating the risk of the guidewire extending too far and injuring tissue. At this point, the guidewire is located inside the guidewire tube 2, providing a stable, rigid support framework externally applied to the entire catheter. The surgeon can then easily use this support to place the drainage end of the drainage tube 1 into the predetermined position in the pleural cavity through the incision. Throughout the insertion process, because the lumen of the drainage tube 1 is completely independent and sealed (its distal end can communicate with the pleural cavity through an opening on the end face or side, but the proximal drainage port 3 can be pre-sealed), pleural effusion or gas will not leak prematurely through the drainage tube 1.

[0024] Once drainage tube 1 is positioned correctly, the surgeon can completely withdraw the guidewire from guidewire tube 2. At this point, guidewire tube 2, due to its distal closure, does not communicate with the chest cavity and remains outside the body as a completed accessory. Subsequently, the surgeon connects the drainage port 3 at the proximal end of drainage tube 1 to the prepared closed drainage system, and normal drainage can begin. This process completely solves the "leakage during transit" problem caused by the shared guidewire and drainage channel in the background technology, and also eliminates the uncertainty risk of a separate guidewire traveling through the body.

[0025] To further improve the smoothness of the operation, as a preferred embodiment, a friction-reducing layer can be coated or attached to the inner wall of the guidewire cannula 2. This friction-reducing layer can be a thin film made of lubricating materials such as polytetrafluoroethylene, which can significantly reduce the frictional resistance when the guidewire slides in the guidewire cannula 2, making the insertion and withdrawal of the guidewire easier and smoother, and improving the controllability of the surgery. In addition, a layer of lubricating grease can also be applied to the guidewire before use, specifically the known lubricating materials such as petroleum jelly, paraffin oil, or other materials.

[0026] Furthermore, this invention can integrate more auxiliary functions. For example, a miniature sensing element, such as a camera or pressure sensor, can be encapsulated inside the blind end 5 of the guidewire 2. The wires of this sensing element can extend along the inside or outside of the guidewire 2 to the proximal end and connect to an external display or recording device. During cannulation, this sensing element can transmit images or pressure data from inside the thoracic cavity in real time, enabling visualized operation or precise positioning, greatly improving the safety and accuracy of the surgery.

[0027] Regarding the specific implementation of the drainage function, multiple side openings 4 are provided on the wall of the drainage tube 1 near the drainage end. These side openings 4 are designed to prevent drainage failure due to tissue blockage of a single opening at the end face, ensuring that accumulated fluid can be efficiently aspirated into the drainage tube 1 from multiple directions and continuously drained through the proximal drainage port 3. The drainage port 3 is typically constructed as a standard Luer connector or other universal interface to ensure a reliable and sealed connection with various commonly used clinical drainage tubing.

[0028] To facilitate the surgeon's visual assessment of the insertion depth during catheter placement, as a preferred embodiment, multiple spaced graduation marks (not shown in the figure) are printed or engraved along the axial direction on the outer wall of the drainage tube 1. These marks clearly indicate the depth of the catheter entering the body, eliminating the need for additional measurement during the procedure and improving the convenience of the surgery and the accuracy of the catheter placement.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A closed chest drainage tube, comprising a drainage tube (1), characterized in that, It also includes a guidewire (2); the guidewire (2) is fixedly disposed outside the drainage tube (1), and the end of it inserted into the thoracic cavity is a closed blind end (5).

2. The closed thoracic drainage tube according to claim 1, characterized in that, The guide wire (2) is attached to the outer wall of the drainage tube (1) and is arranged in parallel with the drainage tube (1).

3. The closed thoracic drainage tube according to claim 1 or 2, characterized in that, The blind end (5) of the guide wire (2) does not extend axially beyond the distal end face of the drainage tube (1) used for drainage.

4. The closed thoracic drainage tube according to claim 3, characterized in that, There is an axial gap between the blind end (5) and the distal end face of the drainage tube (1).

5. The closed thoracic drainage tube according to claim 1 or 2, characterized in that, A sensing element is integrated at the blind end (5) of the guide wire (2).

6. The closed thoracic drainage tube according to claim 1 or 2, characterized in that, The inner wall of the guide wire tube (2) is provided with a friction-reducing layer.

7. The closed thoracic drainage tube according to claim 1 or 2, characterized in that, At least one side inlet (4) is provided on the wall of the drainage tube (1) in the section near its distal end.

8. The closed thoracic drainage tube according to claim 1 or 2, characterized in that, The proximal end of the drainage tube (1) is provided with a drainage port (3) for connecting an external drainage device.

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