Coaxial mesh basket negative pressure catheter
By using a coaxial basket negative pressure catheter to fix the stone and release energy in a concentrated manner, the problems of stone drift and tissue damage in existing technologies are solved, improving the efficiency and safety of stone fragmentation and achieving efficient and non-invasive treatment of stones.
Patent Information
- Application Number
- CN202322428964.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-07
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2033-09-07
AI Technical Summary
Existing laser lithotripsy and electrohydraulic lithotripsy methods have shortcomings in stone fixation and energy release, leading to stone free drift and tissue damage. Furthermore, existing baskets are not compatible with endoscopic instrument channels, affecting lithotripsy effectiveness and safety.
A coaxial basket negative pressure catheter is designed. By setting a stone-breaking section and a basket inside the first tube, the energy release section is ensured to be coaxial with the center of the basket. Combined with negative pressure and liquid injection mechanism, stone fixation and concentrated energy release are achieved, avoiding damage to human tissue.
It improves the efficiency and safety of stone fragmentation, reduces operation time and cost, ensures that all stones are removed, avoids damage to other tissues, and supports blind operation without direct vision.
Smart Images
Figure CN223787667U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of medical device technology for lithotripsy treatment of human stones, and in particular to a coaxial basket negative pressure catheter. Background Technology
[0002] Currently, direct-vision lithotripsy methods for breaking up stones within the body include thermal laser lithotripsy and electrohydraulic lithotripsy. Laser lithotripsy uses a laser to heat the stone to a high temperature, causing it to break apart. However, because heating the stone generates high temperatures in the body's tissue fluid, it can damage natural cavities (ureters, bile ducts, etc.), leading to narrowing, closure, or even loss of function in these cavities. Electrohydraulic lithotripsy works by using high-voltage discharge from electrodes to generate shock waves in a liquid. The energy of these shock waves acts on the stone, causing it to break. Both methods lack stone fixation, resulting in stone drift. With laser lithotripsy, if the laser does not reach the stone, the generated high temperature can damage surrounding tissues; with electrohydraulic lithotripsy, the electrodes directly discharge onto the stone, and the shock waves displace it. In summary, both existing laser and electrohydraulic lithotripsy methods significantly reduce the energy applied to the stone, affecting the lithotripsy effect and potentially damaging tissues and organs.
[0003] Existing lithotripsy baskets are mostly single-lumen tubes, used only for simple stone retrieval, without providing a delivery channel for lithotripsy components. The lithotripsy process needs to be performed under endoscopic visualization, and both the basket and lithotripsy components (such as laser fibers or electrodes) need to pass through the instrument channel of the endoscope. However, the instrument channel of existing endoscopes cannot accommodate both the basket and the electrodes passing through the instrument channel simultaneously. Summary of the Invention
[0004] This invention provides a coaxial basket negative pressure catheter. By placing the lithotripsy section inside a first tube and ensuring that the center of the basket and the energy release section at the end of the lithotripsy section are coaxial with the first tube, the optical fiber or electrode is centered and aligned with the stone in the basket. This allows the shock wave energy from the electrode discharge or the laser energy emitted from the optical fiber to be fully applied to the stone, accelerating the stone fragmentation process. The tip of the first tube is also used to connect a negative pressure mechanism or an injection mechanism. The negative pressure mechanism can aspirate tissue fluid, fine stones, and injected saline solution near the lithotripsy site, maintaining a clear surgical field and ensuring complete stone removal. The injection mechanism can inject contrast agent / saline solution in reverse. This is achieved through the following technical solution.
[0005] A coaxial basket negative pressure conduit includes a first tube and a second tube sleeved outside the first tube, the first tube sliding axially relative to the second tube; the end of the first tube is provided with a basket composed of metal wires, the ends of the metal wires being evenly distributed on the tube wall at the end of the first tube; the interior of the first tube is provided with a stone crushing section that slides relative to the first tube, the end of the stone crushing section being provided with an energy release section, the center of the basket and the center of the energy release section being coaxial with the first tube;
[0006] The first tube has a forked head end and is provided with at least two first interfaces; or, the first tube has a connector at its head end, the connector having at least three second interfaces.
[0007] It should be noted that in the coaxial basket negative pressure conduit provided by this utility model, the first and second tubes can be made of non-metallic materials. The basket is composed of several metal wires, which are initially bent and form a cage-like structure. The selected metal wires must have a certain degree of toughness so that they can be easily stored in the second tube and easily and quickly released from the second tube to extend into a cage-like structure. Therefore, the metal wires can be made of nickel-titanium or stainless steel.
[0008] It should also be noted that the energy release section at the end of the lithotripsy unit can be an electrode (for electrohydraulic lithotripsy) or an optical fiber (optical fiber head, for laser lithotripsy). Regardless of the type of lithotripsy unit chosen, the center of the basket and the center of the energy release section are always coaxial with the first tube. This ensures that the lithotripsy energy is applied to the stone as much as possible, guaranteeing the lithotripsy effect and avoiding damage to the body's natural cavities. The main body of the lithotripsy unit can generally be designed as a long tube and fits against the inner wall of the first tube, but this does not affect the free axial sliding of the lithotripsy unit within the inner tube of the first tube. In this case, the center of the lithotripsy unit (i.e., the electrode or laser head) is naturally aligned with the center of the basket. The excess space between the main body of the lithotripsy unit and the first tube can be connected to a negative pressure mechanism or a fluid injection mechanism, used to aspirate tissue fluid or fine stones, or to inject contrast agent / physiological saline in reverse.
[0009] It should also be noted that the first and second ports at the head of the first tube are for connecting the negative pressure mechanism and the liquid injection mechanism. The negative pressure mechanism and the liquid injection mechanism can be connected using two different first and second ports, which is more convenient to use; alternatively, they can be connected using the same first and second ports, which can be directly removed and replaced during use.
[0010] Preferably, the inner wall of the first pipe and the main body of the crushed stone section are coaxially arranged by a limiting member.
[0011] More preferably, the limiting members are evenly distributed along the axial and circumferential directions on the inner wall of the first tube.
[0012] More preferably, the surface of the limiting member is an arc surface.
[0013] When the diameter of the main body of the crushing section is small and it does not fit snugly against the inner wall of the first pipe, it is necessary to use limiting components to limit the main body of the crushing section, so as to indirectly ensure that the center of the crushing section is aligned with the center of the basket. As a preferred solution, the limiting components can be evenly distributed along the axial and circumferential directions on the side of the main body, so that the clamping action of the limiting components can ensure that the main body of the crushing section is coaxial with the first pipe.
[0014] The coaxial basket negative pressure conduit provided by this utility model has a relatively small diameter. The outer diameter of the first tube does not exceed 2mm (generally 1.5-1.6mm), and the inner diameter of the first tube does not exceed 1mm (generally 0.8-0.9mm). Therefore, the diameter of the main body of the crushing section will not be very small, and the elastic element only needs to have a small elastic deformation.
[0015] Preferably, the metal wire is embedded in the wall of the end of the first tube. As a specific case, when the first and second tubes are made of plastic, the metal wire can be directly embedded in the wall of the first tube during injection molding.
[0016] Preferably, the ends of the second tube and the first tube are limited by a locking assembly.
[0017] More preferably, the locking assembly includes a limiting member disposed on the inner wall of the second tube end or the outer wall of the first tube end, and a limiting groove disposed on the outer wall of the first tube end or the inner wall of the second tube end.
[0018] More preferably, the limiting member is an annular protrusion, and the shape of the limiting groove matches the limiting member.
[0019] The locking mechanism prevents damage to the internal organs from excessive sliding displacement of the first tube relative to the second tube. Generally, the sliding displacement of the first tube should be sufficient to allow the basket to fully extend.
[0020] Preferably, the first tube and the second tube are provided with handles at their ends.
[0021] Compared with the prior art, the advantages of the coaxial basket negative pressure conduit of this utility model are:
[0022] 1. It solves the problem of stones not being able to be fixed during electrohydraulic lithotripsy. Under the constraint of the basket, the stone has "0" relative displacement between itself and the lithotripsy section, thus avoiding the release of energy into tissues outside the stone.
[0023] 2. By fully utilizing the space of the endoscopic instrument channel, both the basket and the electrodes or fiber optic heads of the lithotripsy section can pass through the endoscopic instrument channel. The center of the energy release section is coaxial with the center of the basket. This allows the electrodes or fiber optic heads of the lithotripsy section to be accurately aligned with the stone. The lithotripsy energy of the electrodes or fiber optic heads is controlled within a certain range, maximizing the effect on the stone, resulting in higher lithotripsy efficiency, shorter operation time, and reduced surgical costs and expenses. It also avoids damage to other tissues, making the operation safer, and protects the lens from damage caused by the lithotripsy energy.
[0024] 3. After the stones are broken up, small stones can be expelled directly from the body, while slightly larger stones can be removed from the body through the basket of this patent.
[0025] 4. During laser lithotripsy, the gap between the inner lumen of the catheter and the main body of the lithotripsy unit can absorb fine stones and heated water, avoiding damage to human tissue.
[0026] 5. During the operation, saline solution can be instilled, and then the saline solution and fine stones can be aspirated simultaneously to maintain a clear view within the basket, making it easier to remove all stones and achieve efficient and non-invasive treatment of stone diseases.
[0027] 6. When connected to the injection mechanism, blind injection can be achieved without direct vision with the assistance of the injected contrast agent. Attached Figure Description
[0028] Figure 1 A schematic diagram of the first structure of the coaxial basket negative pressure conduit provided for an embodiment;
[0029] Figure 2 A schematic diagram of the coaxial basket negative pressure conduit provided in the embodiment when the basket is deployed;
[0030] Figure 3 A schematic diagram of a second structure of the coaxial basket negative pressure conduit provided in the embodiment;
[0031] Figure 4 A partial structural diagram of the end of the first tube of the coaxial basket negative pressure conduit provided in the embodiment;
[0032] Figure 5 This is a partial structural diagram of the end of the second tube and the end of the first tube;
[0033] Figure 6 This is a partial structural diagram of the head end of the second tube and the head end of the first tube;
[0034] In the diagram: 1. First tube; 2. Second tube; 3. Metal wire; 4. Net basket; 5. Crushed stone section; 6. Main body; 7. Discharge section; 8. Limiting component; 9. Limiting component; 10. Limiting groove; 11. Handle; 12. First interface; 13. Connector; 14. Second interface. Detailed Implementation
[0035] The technical solutions of various embodiments of this patent will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this patent, and not all of them. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.
[0036] In the description of this patent, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this patent and for simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0037] In the description of this patent, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. It should be pointed out that all accompanying drawings are illustrative. Those skilled in the art can understand the specific meaning of the above terms in this patent based on the specific circumstances.
[0038] The present patent will now be described in further detail with reference to specific embodiments and accompanying drawings.
[0039] Example
[0040] This embodiment uses electrohydraulic lithotripsy as an example, where the lithotripsy section consists of electrodes (discharge section) and power lines connected to the electrodes. Figure 1 , 2As shown, the coaxial basket negative pressure conduit provided in this embodiment includes a first tube 1 and a second tube 2 sleeved outside the first tube 1. The first tube 1 slides axially relative to the second tube 2. A basket 4 composed of metal wires 3 is provided at the end of the first tube 1. The ends of the metal wires 3 are evenly distributed on the tube wall at the end of the first tube 1, and the metal wires 3 are embedded within the tube wall at the end of the first tube 1. A stone-crushing section 5 that slides relative to the first tube 1 is provided inside the first tube 1. An energy release section 7 is provided at the end of the stone-crushing section 5. The center of the basket 4 and the center of the energy release section 7 are coaxial with the first tube 1. Figure 1 , 2 The first tube shown is bifurcated at its head end and has two first interfaces 12; or as shown in the figure. Figure 3 As shown, the first tube 1 has a connector 13 at its head end, and the connector has three second interfaces 14; one of the first interfaces or one of the second interfaces is connected to a negative pressure mechanism.
[0041] The above-mentioned coaxial basket negative pressure conduit is used as follows:
[0042] (1) Insert the lithotripsy section into the first tube. The lithotripsy section, the first tube, and the second tube are brought to the location of the stone together with the endoscope. During this process, the first tube and the basket are completely hidden in the lumen of the second tube. Alternatively, the first tube and the second tube can be brought to the location of the stone together with the endoscope first, and then the lithotripsy section can be inserted.
[0043] The main body of the lithotripsy unit extends from one of the first or second ports at the head end of the first tube, while the other first or second port is closed, or it can be connected to a negative pressure mechanism or an injection mechanism as needed. When "blind injection" is required, contrast agent can be injected through the injection mechanism for assistance; when it is necessary to aspirate surrounding fine stones, physiological saline can be injected through the injection mechanism, and then the negative pressure mechanism can be used to reverse the flow to aspirate the physiological saline and fine stones.
[0044] (2) When the second tube and endoscope are almost at the stone location, begin pushing the first tube, causing the basket wire to protrude from the second tube. The wire stretches out under its own elasticity (e.g., ...). Figure 2 As shown), forming a cage-like net basket;
[0045] (3) Slowly operate the basket to cover the stone that needs to be broken up and place the stone in the center of the basket. If necessary, the first tube can be pulled slightly in the opposite direction to make the wire of the basket contract under the action of the second tube, further binding the stone and preventing it from moving freely.
[0046] (4) Move the main body of the lithotripsy unit so that the energy release unit extends into the first tube and continuously moves to the stone, protruding from the end of the first tube; at this time, the energy release unit is located inside the basket and directly facing the center of the stone. The basket is connected to the head end of the lithotripsy unit and the discharge host (not shown). The discharge power of the discharge unit is controlled by adjusting the parameters of the discharge host. After the stone is broken up, small pieces of stone can be directly expelled from the body, while slightly larger stones can be removed from the body through the basket of this patent.
[0047] Compared to traditional lithotripsy baskets, the aforementioned coaxial basket negative pressure catheter solves the problem of stone fixation during electrohydraulic lithotripsy. Under the constraint of the basket, there is zero relative displacement between the stone and the lithotripsy unit, preventing energy release into tissues outside the stone. The center of the energy release unit is coaxial with the center of the basket, allowing the electrodes or fiber optic heads of the lithotripsy unit to be accurately aligned with the stone. The lithotripsy energy of the electrodes or fiber optic heads is controlled within a certain range, maximizing the effect on the stone, resulting in higher lithotripsy efficiency, shorter operation time, and lower surgical costs. It does not damage other tissues, making the surgery safer; it protects the lens from damage caused by lithotripsy energy; during laser lithotripsy, the gap between the catheter lumen and the main body of the lithotripsy unit allows for the aspiration of fine stones and heated water, preventing damage to human tissue; physiological saline can be infused during the operation, and then the saline and fine stones can be simultaneously aspirated, maintaining a clear view within the basket for efficient and non-invasive stone treatment; when connected to an injection mechanism, with the assistance of injected contrast agent, blind injection can be achieved without direct vision.
[0048] At this point, more of the shock wave energy reaches the stone, increasing the stone-breaking efficiency until the stone is completely broken up.
[0049] like Figure 4 As shown, when the main body of the crushing section has a small pipe diameter and does not fit the inner wall of the first pipe, the inner wall of the first pipe 1 and the main body of the crushing section 5 are coaxially arranged by a limiting member 8. The limiting member 8 is evenly distributed along the axial and circumferential directions on the inner wall of the first pipe 1, and the surface of the limiting member 8 is an arc surface.
[0050] like Figure 5 As shown, the ends of the second tube 2 and the first tube 1 are limited by a locking assembly. The locking assembly includes a limiting member 9 disposed on the inner tube wall at the end of the second tube 2, and a limiting groove 10 disposed on the outer tube wall at the end of the first tube 1; the limiting member 9 is an annular protrusion, and the shape of the limiting groove 10 matches that of the limiting member 9.
[0051] like Figure 6 As shown, the first tube 1 and the second tube 2 are provided with handles 11 at their ends.
[0052] The above embodiments describe the implementation of this utility model in detail. However, this utility model is not limited to the specific details in the above embodiments. Within the scope of the claims and technical concept of this utility model, various simple modifications and changes can be made to the technical solution of this utility model, and these simple modifications all fall within the protection scope of this utility model.
Claims
1. A coaxial basket negative pressure conduit, characterized in that, The device includes a first tube and a second tube sleeved outside the first tube, with the first tube sliding axially relative to the second tube; the end of the first tube is provided with a wire mesh basket, the ends of which are evenly distributed on the tube wall at the end of the first tube; the interior of the first tube is provided with a stone crushing section that slides relative to the first tube, the end of which is provided with an energy release section, and the center of the wire mesh basket and the center of the energy release section are coaxial with the first tube; The first tube has a forked end and is provided with at least two first interfaces; or, the first tube has a connector at its head end, the connector having at least three second interfaces; wherein one of the first interfaces or one of the second interfaces is connected to a negative pressure mechanism.
2. The coaxial basket negative pressure conduit according to claim 1, characterized in that, The inner wall of the first pipe and the main body of the crushed stone section are coaxially arranged by a limiting member.
3. The coaxial basket negative pressure conduit according to claim 2, characterized in that, The limiting elements are evenly distributed along the axial and circumferential directions on the inner wall of the first tube.
4. The coaxial basket negative pressure conduit according to claim 3, characterized in that, The surface of the limiting component is an arc surface.
5. The coaxial basket negative pressure conduit according to claim 1, characterized in that, The metal wire is embedded in the pipe wall at the end of the first pipe.
6. The coaxial basket negative pressure conduit according to claim 1, characterized in that, The ends of the second tube and the first tube are limited by a locking assembly.
7. The coaxial basket negative pressure conduit according to claim 6, characterized in that, The locking assembly includes a limiting member disposed on the inner wall of the second tube end or the outer wall of the first tube end, and a limiting groove disposed on the outer wall of the first tube end or the inner wall of the second tube end.
8. The coaxial basket negative pressure conduit according to claim 7, characterized in that, The limiting member is a circular protrusion, and the shape of the limiting groove matches the limiting member.
9. The coaxial basket negative pressure conduit according to claim 1, characterized in that, The first and second tubes are equipped with handles at their ends.