Hydraulically driven stenosis penetrator for passage and expansion of difficult stenosis in ERCP surgery
Through the hydraulically driven narrow penetrator, the hydraulic principle and serrated tip design are used to solve the problem of difficult narrow passage and opening in ERCP, and efficient narrow penetration and expansion are achieved.
Patent Information
- Application Number
- CN202411861359.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-02-18
AI Technical Summary
In ERCP, difficult and narrow passage and opening are a problem. Prior art such as expansion probes, columnar airbags and stent takers are inefficient, low success rate and difficult operation in this scenario.
A hydraulically driven narrow penetrator is designed, including a hydraulic chamber, a front end and a propeller end arranged at both ends of the hydraulic chamber opposite to the hydraulic chamber. The front end of the penetrator is in communication with the hydraulic chamber, the inner diameter is smaller than the inner diameter of the hydraulic chamber, and the propeller end piston is As the propeller end moves toward the front end of the penetrator, the tip of the penetrator front end experiences a forward stinging behavior, and the tip is designed to be jagged to create a cutting effect.
Through the hydraulic principle, effective propulsion force is provided, and the serrated tip can efficiently penetrate the stenosis under propulsion, achieving the passage and expansion of difficult stenosis, and improving the open success rate of stenosis in ERCP.
Smart Images
Figure CN119454185A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a medical device, in particular to a hydraulically driven stricture penetrator design for passing through and dilating difficult strictures during ERCP. Background Art
[0002] ERCP is the first-line treatment for opening bile duct strictures. In patients with bile duct strictures, especially those with benign strictures, it is a difficult problem to open the tough strictures through dilation. During the ERCP treatment, after completing the superselection of the stricture, when other attachments are sent in through the indwelling guide wire, due to the poor opening of the stricture, some of which are even scar-like strictures, it will be extremely difficult to pass the attachments. At this time, dilation of the stricture is the key to solving the stricture problem.
[0003] At present, we commonly use dilatation bougies, special cylindrical balloons (such as Hurricane cylindrical balloons) and stent retrievers (Sohendra) in clinical practice. In clinical practice, we often encounter situations where dilatation bougies and special cylindrical balloons are ineffective. The stent retriever, due to its spiral design at the head end, is originally used for fixing and removing the end of the plastic stent, but it can also play a penetrating role in narrow application scenarios. However, its efficiency is low, the success rate is not high, and the operation is more difficult. Therefore, it is an urgent need in clinical work to open difficult bile duct strictures.
[0004] Purpose of the Invention
[0005] The object of the present invention is to provide a hydraulically driven stricture penetrator design for use in the passage and dilation of difficult strictures during ERCP, and to solve the problem of passage and opening of bile duct strictures by means of the hydraulically driven stricture penetrator.
[0006] The present invention provides a hydraulically driven stenosis penetrator for passing through and dilating difficult stenosis during ERCP, which is characterized by:
[0007] It includes a hydraulic chamber, and a penetrator front end and a propulsion end disposed at opposite ends of the hydraulic chamber;
[0008] Wherein, the front end of the penetrator is connected to the hydraulic cavity, and its inner diameter is smaller than the inner diameter of the hydraulic cavity;
[0009] The propulsion end is piston-like and slidably arranged in the hydraulic cavity. As the propulsion end moves toward the front end of the penetrator, the tip of the front end of the penetrator pierces forward.
[0010] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0011] The tip of the front end of the penetrator has a sawtooth-shaped external viewing surface.
[0012] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0013] The front end of the penetrator is provided with a channel for accommodating the passage of a guide wire.
[0014] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0015] The hydraulic chamber is filled with hydraulic fluid.
[0016] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0017] The inner diameter of the front end of the penetrator is 1 / 2 of the hydraulic cavity.
[0018] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0019] The inner diameter of the front end of the penetrator is 1 / 3 of the hydraulic cavity.
[0020] Furthermore, the hydraulically driven stenosis penetrator provided by the present invention for passing through and dilating difficult stenosis during ERCP is also characterized by:
[0021] The inner diameter of the front end of the penetrator is 1 / 4 of the hydraulic chamber.
[0022] Functions and effects of the present invention
[0023] The design of the present invention is mainly a narrow penetration device based on the hydraulic principle. The center of the attachment is a through hydraulic cavity, which is characterized by a higher inner diameter of the operating part than the front. When the hydraulic rod is pushed forward, based on the hydraulic principle, the front tip penetration part (i.e., tip) will obtain effective propulsion force and distance. The tip is designed to be serrated, which can produce a cutting effect when passing through the stenosis under strong propulsion, and can efficiently achieve the penetration and expansion of the stenosis, thereby utilizing the effective penetration and expansion of the hydraulic penetrator to achieve the passage and expansion of difficult stenosis. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the overall appearance of a hydraulically driven narrow penetrator;
[0025] Figure 2 It is a simplified diagram of hydraulic principle;
[0026] Figure 3 A schematic diagram of the penetrating tip of the hydraulically driven narrow penetrator head;
[0027] Figure 4 Schematic diagram of the cross section of the hydraulically driven narrow penetrator head
[0028] Figure 5 The following is a schematic diagram of the specific implementation. DETAILED DESCRIPTION
[0029] The present invention will be further described below in conjunction with the accompanying drawings.
[0030] like Figure 1 As shown, this embodiment provides a hydraulically driven stenosis penetrator for passing and dilating difficult stenosis during ERCP, comprising a hydraulic chamber 2, and a penetrator front end 3 and a propulsion end 1 disposed at opposite ends of the hydraulic chamber;
[0031] The front end 3 of the penetrator is in communication with the hydraulic chamber 1 , and its inner diameter is smaller than the inner diameter of the hydraulic chamber, and the front end 3 of the penetrator is in an effectively isolated state from the hydraulic chamber 2 .
[0032] The propulsion end 1 is piston-shaped and slidingly arranged in the hydraulic chamber 2. The propulsion mode of the propulsion end 1 can be direct propulsion or spiral propulsion. As the propulsion end moves toward the front end of the penetrator, the tip of the front end of the penetrator pierces forward. Specifically, since the inner diameter of the hydraulic chamber 2 is in a certain ratio with the inner diameter of the front end 3 (2:1 / 3:1 / 4:1, etc.), based on the following example: Figure 2 The hydraulic principle shown is that, in a fluid-through device, when pressure is applied downwards in the cavity with the largest inner diameter to move the liquid level downwards, the liquid in the smaller cavity will rise, and the distance it rises is inversely proportional to the inner diameters of the two cavities. Therefore, when the propulsion rod is pushed forward, the front propulsion tip will effectively penetrate forward according to the multiples of the inner diameter ratio.
[0033] like Figure 3 As shown, a guidewire cavity 4 is retained in the center of the front end 3 of the penetrator, and the hydraulically driven stricture penetrator performs stricture passage and expansion operations under the guidance of the guidewire.
[0034] like Figure 4 As shown, the tip is serrated, and the serrated tip generates cutting force and forward penetrating force when passing through the stenosis under the force of hydraulic propulsion, thereby achieving the effect of penetrating the stenosis.
[0035] like Figure 5As shown in the figure, it is a schematic diagram of the specific implementation of the hydraulically driven stricture penetrator passing through the stricture, a is the stricture of the bile duct, the superselective guide wire passes through the stricture and plays a guiding role, b is the stricture of the bile duct, guided by the guide wire, during the operation, the front end of the penetrator is positioned and sent to the head end of the stricture of the bile duct through the guide wire, based on the fact that the tube body itself has a certain elasticity and telescopic force, therefore, when the front end of the penetrator reaches the stricture of the bile duct, it can continue to be pushed until it can no longer move forward. At this time, the push rod is pushed to press the liquid into the front end of the liquid penetrator under pressure, and the tip of the pressure-driven stricture penetrator can quickly pass through the stricture under the action of pressure.
Claims
1. A hydraulically driven stricture penetrator for the passage and dilation of difficult strictures during ERCP, characterized by: It includes a hydraulic chamber, and a penetrator front end and a propulsion end disposed at opposite ends of the hydraulic chamber; Wherein, the front end of the penetrator is connected to the hydraulic cavity, and its inner diameter is smaller than the inner diameter of the hydraulic cavity; The propulsion end is piston-like and slidably arranged in the hydraulic cavity. As the propulsion end moves toward the front end of the penetrator, the tip of the front end of the penetrator pierces forward.
2. The hydraulically driven stenosis penetrator for passing and dilating difficult stenosis during ERCP as claimed in claim 1, characterized in that: The tip of the front end of the penetrator has a sawtooth-shaped external viewing surface.
3. The hydraulically driven stricture penetrator for passing and dilating difficult strictures during ERCP as claimed in claim 1, characterized in that: The front end of the penetrator is provided with a channel for accommodating the passage of a guide wire.
4. The hydraulically driven stricture penetrator for passing and dilating difficult strictures during ERCP as claimed in claim 1, characterized in that: The hydraulic chamber is filled with hydraulic fluid.
5. The hydraulically driven stricture penetrator for passing and dilating difficult strictures during ERCP as claimed in claim 1, characterized in that: The inner diameter of the front end of the penetrator is 1 / 2 of the hydraulic cavity.
6. The hydraulically driven stenosis penetrator for passing and dilating difficult stenosis during ERCP as claimed in claim 1, characterized in that: The inner diameter of the front end of the penetrator is 1 / 3 of the hydraulic cavity.
7. The hydraulically driven stricture penetrator for passing and dilating difficult strictures during ERCP as claimed in claim 1, characterized in that: The inner diameter of the front end of the penetrator is 1 / 4 of the hydraulic chamber.