Pigtail catheter with positioning wing

Abstract

A pigtail catheter with positioning wings, relating to the field of medical device technology, comprises a catheter body. The upper end of the catheter body is coiled to form a coiled section with multiple side holes. A flow control cylinder is located outside the catheter body, and a piston is located inside the flow control cylinder. A rotatable piston rod is mounted on the piston, and the piston rod is threaded into the flow control cylinder. The lower end of the piston rod extends from the lower end of the flow control cylinder. A manifold is located in the lower section of the catheter body. Multiple positioning components are located on the outer wall of the coiled section of the catheter body. Each positioning component consists of multiple positioning wings symmetrically arranged circumferentially along the coiled section. The positioning wings are soft fluid-filled bladders. A fluid control channel connecting the bladder cavities of each positioning wing is located within the catheter body. The fluid control channel connects to the rodless cavity of the flow control cylinder via the manifold. The pigtail catheter provided by this invention is suitable for cardiovascular interventional diagnosis and treatment.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a pig tail catheter with positioning wings. Background Technology

[0002] In interventional cardiovascular diagnosis and treatment, the straight-tip pigtail catheter is a core instrument for left ventricular-related procedures (such as left ventricular pressure measurement and left ventricular angiography). It enters the left ventricular cavity through the femoral or radial artery approach, crossing the aortic valve. Relying on the pigtail-shaped curled tip and side holes, it can assess the morphology of the left ventricular cavity and myocardial function, as well as monitor the pressure in the left ventricular cavity and the pressure in the aorta, providing key evidence for the assessment of left ventricular myocardial size and function, and the evaluation of pressure gradient.

[0003] Currently, the commonly used straight-tip pigtail catheter in clinical practice mainly consists of a straight catheter body and a pigtail curled segment. The outer wall of the pigtail curled segment has a side hole. Its core design is to avoid damage to the myocardium and valves through the soft pigtail-shaped tip. However, with the increasing demand for precision in clinical interventional procedures, it has been found that the existing straight-tip pigtail catheter has defects in practical applications, affecting the safety of operation and the accuracy of diagnosis and treatment. Specifically: the catheter tip is prone to adhering to the wall, leading to inaccurate angiography and pressure measurement results; the existing straight-tip pigtail catheter lacks a dedicated positioning structure. After entering the left ventricular cavity, affected by cardiac contraction and relaxation and blood flow impact, the pigtail curled segment and side hole are prone to adhering to the left ventricular wall (especially the apex and interventricular septum), causing the contrast agent to not fill the left ventricular cavity evenly, resulting in local accumulation, and thus misjudging the morphology of the left ventricular cavity and the motion of the ventricular wall; at the same time, the side hole adhering to the wall can cause the pressure sensor to fail to detect the true pressure in the left ventricular cavity, resulting in false abnormalities in key indicators such as left ventricular end-diastolic pressure and systolic pressure, affecting the accuracy of pressure gradient assessment and delaying the diagnosis of the condition. Utility Model Content

[0004] In view of the defects existing in the prior art, the technical problem to be solved by this utility model is to provide a pig tail catheter with positioning wings that can avoid the pig tail catheter from sticking to the wall and avoid distortion of angiography and pressure measurement results.

[0005] To solve the above-mentioned technical problems, the present invention provides a pig tail catheter with positioning wings, comprising a catheter body, wherein the upper end of the catheter body is curled to form a curled tube segment, and the curled tube segment has multiple side holes, characterized in that:

[0006] The outside of the catheter body is provided with a flow control cylinder, and the inside of the flow control cylinder is provided with a piston. The piston divides the cavity of the flow control cylinder into an upper and a lower chamber. The upper chamber is a rodless chamber and the lower chamber is a rod chamber. The rodless chamber of the flow control cylinder is filled with liquid. The piston is provided with a rotatable piston rod. The piston rod and the flow control cylinder are threaded together. The lower end of the piston rod extends out from the lower end of the flow control cylinder.

[0007] The lower section of the catheter body is provided with a manifold, and the outer wall of the coiled section of the catheter body is provided with multiple positioning components. Each positioning component consists of multiple positioning vanes symmetrically arranged along the circumference of the coiled section. The positioning vanes are soft liquid sacs. The catheter body is provided with a liquid control channel connecting the sacs of each positioning vane. The liquid control channel is connected to the rodless cavity of the flow control tube via the manifold.

[0008] Furthermore, the outer wall of the coiled tube section of the conduit body is provided with multiple wing slots for accommodating positioning winglets.

[0009] The pig tail catheter with positioning wings provided by this utility model can use the positioning wings to prevent the pig tail catheter from sticking to the wall, so that all the side holes on the pig tail catheter can remain unobstructed and avoid distortion of angiography and pressure measurement results. Attached Figure Description

[0010] Figure 1 This is a front view schematic diagram of the pig tail tube with positioning wings according to an embodiment of the present invention;

[0011] Figure 2 yes Figure 1 An enlarged view of part A in the image;

[0012] Figure 3 yes Figure 1 An enlarged view of part B in the image. Detailed Implementation

[0013] The embodiments of this utility model are described in further detail below with reference to the accompanying drawings. However, these embodiments are not intended to limit this utility model. Any similar structures or variations thereof that adopt this utility model should be included in the protection scope of this utility model. The commas in this utility model all indicate the relationship between and.

[0014] like Figures 1-3 As shown, the pig tail catheter with positioning wings provided in this embodiment of the present invention includes a catheter body, the upper end of which is curled to form a curled tube segment 11, and a plurality of side holes 13 are provided on the curled tube segment 11.

[0015] The catheter body is provided with a flow control cylinder 4 on the outside and a piston 42 inside the flow control cylinder. The piston divides the flow control cylinder cavity into an upper and a lower chamber. The upper chamber is a rodless chamber and the lower chamber is a rod chamber. The rodless chamber of the flow control cylinder is filled with liquid (in this embodiment, the liquid in the rodless chamber is physiological saline). The piston is provided with a rotatable piston rod 41. The piston rod 41 is threadedly engaged with the flow control cylinder. The lower end of the piston rod 41 extends from the lower end of the flow control cylinder.

[0016] The lower section 12 of the catheter body is provided with a manifold 3. The outer wall of the coiled section of the catheter body is provided with multiple positioning components. Each positioning component consists of multiple positioning vanes 2 symmetrically arranged along the circumference of the coiled section. The positioning vanes 2 are soft liquid sacs. The catheter body is provided with a liquid control channel 14 that connects the sac cavities of each positioning vane. The liquid control channel 14 is connected to the rodless cavity of the flow control tube 4 via the manifold 3.

[0017] In this embodiment of the present invention, the outer wall of the coiled tube section 11 of the conduit body is provided with a plurality of wing slots 15 for accommodating the positioning wing 2.

[0018] The pig tail catheter with positioning wings provided in this embodiment of the invention is suitable for cardiovascular interventional diagnosis and treatment;

[0019] In the initial state, each positioning wing 2 is in a collapsed state and retracts into its respective wing slot 15;

[0020] In use, the guidewire guides the coiled section 11 of the catheter body along the tracing blood vessel to the target site. Then, the piston rod 41 is turned, and the piston pushes the fluid control tube into the cavity of each positioning wing 2 along the fluid control channel 14. After each positioning wing 2 expands, it disengages from the wing groove 15 and stands up. Each positioning wing 2 then abuts against the surrounding blood vessel wall to form support, so that the coiled section 11 of the catheter body will not stick to the wall. This ensures that each side hole 13 on the coiled section 11 remains unobstructed. Since the piston rod 41 and the flow control tube are threaded, each positioning wing 2 can achieve self-locking after being opened. The operator does not need to apply continuous force. The expansion degree of the positioning wing can be adjusted by finely adjusting the piston rod 41, thereby adjusting the opening degree of the positioning wing.

[0021] When the pig tail catheter needs to be removed, turn the piston rod 41 to use the piston to draw the liquid in the cavities of each positioning wing 2 back into the flow control tube. At this time, each positioning wing 2 collapses again, and then the pig tail catheter can be removed. After each positioning wing collapses, it is relatively soft. When the pig tail catheter is removed, each positioning wing returns to its respective wing groove 15 under the squeezing and pushing of the blood vessel lumen.

Claims

1. A pig tail catheter with positioning wings, comprising a catheter body, the upper end of which is coiled to form a coiled tube segment, the coiled tube segment having multiple side holes, characterized in that: The outside of the catheter body is provided with a flow control cylinder, and the inside of the flow control cylinder is provided with a piston. The piston divides the cavity of the flow control cylinder into an upper and a lower chamber. The upper chamber is a rodless chamber and the lower chamber is a rod chamber. The rodless chamber of the flow control cylinder is filled with liquid. The piston is provided with a rotatable piston rod. The piston rod and the flow control cylinder are threaded together. The lower end of the piston rod extends out from the lower end of the flow control cylinder. The lower section of the catheter body is provided with a manifold, and the outer wall of the coiled section of the catheter body is provided with multiple positioning components. Each positioning component consists of multiple positioning vanes symmetrically arranged along the circumference of the coiled section. The positioning vanes are soft liquid sacs. The catheter body is provided with a liquid control channel connecting the sacs of each positioning vane. The liquid control channel is connected to the rodless cavity of the flow control tube via the manifold.

2. The pigtail catheter with positioning wings of claim 1, wherein: The outer wall of the coiled tube section of the conduit body is provided with multiple wing slots for accommodating positioning winglets.

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