A negative pressure stone basket and an integrated endoscopic catheter

Abstract

A negative pressure stone basket and an integrated endoscopic catheter are disclosed. The negative pressure stone basket has an outer opening and a connecting part fitted onto the area near the top of the endoscopic catheter head. Multiple water inlet channels are provided near the inner opening of the negative pressure stone basket, and the water inlet channels are distributed circumferentially around the inner opening of the negative pressure stone basket. Water can enter the water inlet channel through the outer opening of the water inlet channel due to the negative pressure of the inner cavity of the negative pressure stone basket, and then enter the inner cavity of the negative pressure stone basket through the inner opening of the water inlet channel. During laser lithotripsy, water enters through the gap between the sheath tube and the endoscopic catheter. The working channel of the endoscopic catheter is connected to negative pressure. The inner opening of the negative pressure stone basket is close to or close to the target stone. The optical fiber extends from the inner opening of the working channel of the endoscopic catheter and releases energy to break the stone by touching or being near the target stone. Water continuously enters the inner cavity of the negative pressure stone basket due to the negative pressure, and the stone powder and the heat energy generated by the laser are discharged to the outside of the body with the water flow through the working channel of the endoscopic catheter.

Description

Technical Field

[0001] This invention relates to a negative pressure stone basket and an integrated endoscopic catheter, belonging to the technical field of medical device products. Background Technology

[0002] Laser surgery for urinary system stones is extremely common in clinical practice. Some poorly located primary stones need to be moved to areas where laser delivery is easier, and some broken stone clumps also need to be removed promptly. Traditional techniques typically use stone baskets to grasp these stones, but in the confined spaces of the renal calyces and ureters, the stone baskets often cannot open fully, preventing primary stones and broken stone clumps from entering the smaller mesh openings. Even during laser lithotripsy, large stone clumps are usually removed using traditional stone baskets made of multiple wires, but a large number of stone fragments remain, typically around 2mm in diameter. These fragments are difficult for the stone baskets to grasp, and direct water flushing is unguided, resulting in extremely poor cleaning effectiveness. Ultimately, patients rely on the patient's condition for proper removal. The patient will gradually expel the stone fragments with urine within several days after the operation. Clinical studies have shown that residual stone fragments or powder will significantly increase the risk of postoperative urinary tract infection and stone recurrence. In recent years, with the popularization of negative pressure technology, the negative pressure suction in the sheath gap combined with the irrigation fluid vortex in the working channel opening can achieve the effect of negative pressure suction and removal of stone fragments without a basket. However, it is time-consuming and laborious to move the stone fragments to the outside of the body, which usually requires a suction of about 60 cm. Usually, one stone fragment is suctioned at a time, and the operation frequency is extremely high. In order to avoid excessive local temperature, the current method is intermittent laser release. The whole process of laser lithotripsy is time-consuming and it is difficult to completely avoid the high temperature and high pressure damage to the urinary system during the lithotripsy process. Summary of the Invention

[0003] To achieve continuous lithotripsy without the risks of high temperature and high pressure, simultaneous suction of stone powder, and high-efficiency removal of stone debris, this invention provides a negative pressure stone basket and an integrated endoscopic catheter. The negative pressure stone basket allows for lithotripsy, and negative pressure is applied to the working channel of the endoscopic catheter. Cooling and flushing water delivered through the sheath gap flows into the inner cavity of the negative pressure stone basket through a circumferentially distributed water inlet channel below the inner opening. This continuously removes the heat generated by the laser and stone powder from the body, while larger stone fragments can be retained in the upper cavity of the negative pressure stone basket's receiving section and removed from the body in one go.

[0004] This invention is implemented as follows:

[0005] A negative pressure stone-collecting basket has a cylindrical main body. The inner cavity of the basket has an external opening and an internal opening. The external opening and the connecting part of the basket are fitted onto the area near the tip of an endoscopic catheter. The receiving part of the basket protrudes from the tip of the endoscopic catheter. The internal opening is the external opening of the inner cavity of the receiving part. The probing component at the tip of the endoscopic catheter and the internal opening of the working channel of the endoscopic catheter are located at the bottom of the inner cavity of the receiving part. Multiple water inlet channels are provided near the internal opening, distributed circumferentially around the opening, allowing water flow... Water enters the negative pressure chamber of the negative pressure stone basket through the external opening of the water inlet channel. Then, it enters the internal opening of the negative pressure stone basket through the internal opening of the water inlet channel. During laser lithotripsy, water enters through the gap between the sheath and the endoscope catheter. The working channel of the endoscope catheter is connected to negative pressure. The opening of the negative pressure stone basket is close to or close to the target stone. The optical fiber extends from the opening of the working channel of the endoscope catheter and releases energy to break the stone by touching or being near the target stone. Water flows continuously through the water inlet channel into the internal cavity of the negative pressure stone basket due to the negative pressure. The stone fragments and the heat energy generated by the laser are discharged out of the body with the water flow through the working channel of the endoscope catheter.

[0006] The negative pressure stone basket is flexible at least in the outer opening area, which allows for better contact with the stone surface and a sealing effect, preventing the escape of stone powder generated during laser lithotripsy.

[0007] Negative pressure stone baskets are preferably transparent to facilitate endoscopic image acquisition.

[0008] The negative pressure stone basket has a hydrophilic coating on at least one of its outer and inner surfaces. After the hydrophilic coating is hydrated, it can significantly reduce the friction when the negative pressure stone basket comes into contact with the ureter, renal pelvis, and renal calyces, thus reducing mucosal damage. It can also reduce the friction when the negative pressure stone basket moves within the sheath.

[0009] Furthermore, the negative pressure stone basket has an outward-spreading skirt at the inner opening. The outward-spreading skirt makes the surface area of ​​the inner opening of the negative pressure stone basket larger than the average cross-sectional area of ​​the inner cavity of the negative pressure stone basket. The outward-spreading skirt better prevents the escape of stone powder during the stone crushing process, which is conducive to the immediate removal of stones.

[0010] To facilitate better outward deformation during use, the thickness of the outward-spreading skirt is lower than the thickness of the main body of the negative pressure stone basket, and / or a weak band is set at the junction of the outward-spreading skirt and the main body of the negative pressure stone basket. The outward-spreading skirt can be smooth or wrinkled, and a wrinkled outward-spreading skirt is easier to fit the stone.

[0011] To provide better cooling and flushing water flow, multiple water inlet channels are distributed around the circumference of the outward-facing skirt, and / or the outward-facing skirt is provided with multiple water inlet openings distributed around the circumference of the outward-facing skirt.

[0012] One optimized structure is that the water inlet channel opens towards the inside of the negative pressure stone basket, that is, the position of the inner opening of the water inlet channel is closer to the inner opening of the negative pressure stone basket than the position of the outer opening of the water inlet channel, so that the water flow is closer to the stone-breaking position of the laser fiber.

[0013] Another optimized structure is that the negative pressure stone basket has a continuous or intermittent weak band distributed around its water inlet channel. The weak band makes it easy for the part of the negative pressure stone basket containing the water inlet channel to expand outward or fold over.

[0014] When using a negative pressure stone basket to move larger stones, the open water inlet channel is not conducive to the negative pressure effect. The weak zone causes the part of the negative pressure stone basket containing the water inlet channel to expand outward or fold when subjected to force, i.e., when squeezed by the stone, making it difficult for external water to enter the inner cavity of the negative pressure stone basket. The stone will be subjected to greater negative pressure attraction.

[0015] To facilitate the initial movement of stones during surgery, the upper part of the negative pressure stone basket is folded, and the upper part of the folded negative pressure stone basket is provided with circumferentially distributed water inlet channels. The negative pressure will not be weakened during the initial adsorption and movement of stones through the water inlet channels.

[0016] To prevent large stone fragments from clogging the opening or working channel, a thin, transparent isolator is also included in the inner cavity of the negative pressure stone basket receiving part. The isolator divides the inner cavity of the negative pressure stone basket receiving part into an upper cavity and a lower cavity. The isolator has an optical fiber hole for optical fiber to pass through and multiple interception holes. The cross-sectional area of ​​each interception hole is smaller than the surface area of ​​the opening in the working channel of the matching endoscope catheter.

[0017] The fiber optic aperture also extends into a fiber optic guide tube, which can be curved or straight. The curved fiber optic guide tube allows the fiber to bend, making it easier to reach the stone located on the curved side.

[0018] The opening inside the negative pressure stone basket is angled to one side or bent to one side.

[0019] The aforementioned negative pressure stone basket can be fitted onto the endoscope catheter during use. Alternatively, the aforementioned negative pressure stone basket can be pre-installed at the tip of the endoscope catheter.

[0020] The beneficial effects of this invention are:

[0021] 1. The negative pressure stone basket uses a flexible inner opening area to adsorb the original target stone and move it to a position that is conducive to stone fragmentation, such as moving it from the lower calyx of the kidney to the upper calyx of the kidney. It is convenient to use and reduces the dependence on the operating space, replacing the traditional stone basket.

[0022] 2. During lithotripsy, the flexible inner opening of the negative pressure stone basket partially covers the target stone before the laser fiber contacts or approaches the stone, allowing for continuous release of laser energy. Negative pressure is applied to the working channel of the endoscopic catheter, and cooling and flushing water delivered through the gap between the endoscope sheaths flows into the inner cavity of the negative pressure stone basket through the circumferentially distributed water inlet channels below the inner opening. This continuously discharges the heat generated by the laser and stone powder with a diameter of approximately 250 micrometers to the outside of the body through the working channel, greatly improving lithotripsy efficiency while ensuring that no high-temperature water comes into contact with the urinary tract mucosa throughout the entire process, completely eliminating the risk of high-temperature damage during surgery.

[0023] 3. Because the endoscope sheath gap delivers cooling and flushing water, and the transverse cross-sectional area of ​​the endoscope sheath gap is larger than the transverse cross-sectional area of ​​the working channel of the endoscope catheter, the water supply capacity is excellent. By setting a safe irrigation pressure, such as an irrigation pressure below 30 mmHg, the flow rate is adjusted by negative pressure, which completely eliminates the risk of high pressure in laser lithotripsy, eliminating the need for pressure monitoring and saving surgical costs.

[0024] 4. Because the transverse cross-sectional area of ​​the sheath gap is larger than the transverse cross-sectional area of ​​the working channel of the endoscope catheter, the water supply capacity is sufficient. A smaller diameter sheath can be selected to be used with the endoscope catheter, which significantly reduces the damage of the sheath to the urinary tract.

[0025] 5. During laser lithotripsy, multiple large stone fragments with a diameter of about 2 mm can be retained in the upper cavity of the negative pressure stone basket and quickly removed from the body in one go, greatly saving surgical time.

[0026] 6. The "inward-flowing" irrigation fluid mode "contains" the stone powder within the negative pressure stone basket, which helps to achieve immediate stone removal and saves surgical time. In contrast, the traditional "outward-flowing" irrigation fluid mode scatters the stone powder everywhere, making it difficult to remove.

[0027] 7. The opening of the negative pressure stone basket is angled or bent to one side, which helps to fully contact and adsorb stones that have moved to a more remote position.

[0028] 8. The negative pressure stone basket has various specific structures to meet clinical needs: the outward-spreading skirt increases the contact area with the stone, better exerting the sealing effect and preventing stone powder from escaping; multiple water inlet openings on the outward-spreading skirt ensure sufficient water flow; the water inlet channel faces the opening inside the negative pressure stone basket, allowing the water flow to be closer to the laser fiber lithotripsy area; the setting of the weak zone makes the area where the water inlet channel is opened easy to spread out or fold, which is convenient for adsorbing and moving larger stones.

[0029] 9. The upper part of the negative pressure stone basket is folded, and water inlet channels are set around the folded area. When in use, the stones are first adsorbed and moved. When laser lithotripsy is performed, the folded area is unfolded to expose the water inlet channels.

[0030] 10. When the stone is located off-center, the curved fiber optic guide tube on the isolator can drive the fiber optic cable to bend towards the stone.

[0031] 11. The negative pressure stone basket integrated endoscope catheter has a negative pressure stone basket pre-positioned at the top of the endoscope catheter tip, making it more convenient to use.

[0032] The negative pressure stone basket and the integrated negative pressure stone basket endoscopic catheter of the present invention upgrade the laser lithotripsy of the urinary system from intermittent laser release to continuous operation, continuously remove stone powder, shorten the average operation time by 20%-50% in in vitro simulation, and completely eliminate the risks of high temperature and high pressure during operation. Attached Figure Description

[0033] The following figures are not limited to the present invention:

[0034] Figure 1A Example 1: Partial cross-sectional three-dimensional schematic diagram of the negative pressure stone basket, endoscopic catheter, and matching sheath.

[0035] Figure 1B Example 1: A partial cross-sectional diagram of a negative pressure stone basket entering the renal calyx.

[0036] Figure 1C Example 1: A three-dimensional schematic diagram of a negative pressure stone basket at one angle.

[0037] Figure 1D Example 1: A three-dimensional schematic diagram of a negative pressure stone basket from another angle.

[0038] Figure 2A Example 2: Partial cross-sectional three-dimensional schematic diagram of a negative pressure stone basket under laser lithotripsy.

[0039] Figure 2B Example 2: Cross-sectional three-dimensional schematic diagram of a negative pressure stone basket with a water inlet structure.

[0040] Figure 2C Example 2: Cross-sectional three-dimensional schematic diagram of the thin, outward-spreading skirt of the negative pressure stone basket.

[0041] Figure 3A Example 3: Cross-sectional three-dimensional schematic diagram of a negative pressure stone basket with a weak zone.

[0042] Figure 3B Example 3: Partial cross-sectional three-dimensional schematic diagram of negative pressure stone basket for attracting stones.

[0043] Figure 3C Example 3: A partial cross-sectional three-dimensional schematic diagram of the suction of stones in the upper part of the negative pressure stone basket under folded-over state.

[0044] Figure 4AExample 4: Partial cross-sectional three-dimensional schematic diagram of the inner cavity of the negative pressure stone basket containing an isolator.

[0045] Figure 4B Example 4: Partial cross-sectional three-dimensional schematic diagram of the fiber optic guide tube extending from the isolator.

[0046] Figure 4C Example 4: A three-dimensional schematic diagram from another angle

[0047] Figure 5A Example 5: Partial cross-sectional three-dimensional schematic diagram of the opening of the negative pressure stone basket tilted to one side.

[0048] Figure 5B Example 5: Partial cross-sectional three-dimensional schematic diagram of the opening of the negative pressure stone basket bent to one side.

[0049] Figure 5C Example 5: Partial cross-sectional three-dimensional schematic diagram of a curved optical fiber guide tube.

[0050] In the attached diagrams above, each arrow indicates the direction of water flow. Detailed Implementation

[0051] The embodiments of the present invention are not limited to the following:

[0052] Example 1:

[0053] like Figure 1A-1DAs shown, the endoscopic catheter 1 and the sheath 3 used in urological stone surgery are described. The slender endoscopic catheter 1 is equipped with a probing component 112 and a working channel 10 extending from head to tail. The working channel 10 has an internal opening 101 that enters the body during use and an external opening 102 located outside the body. The internal opening 101 is located at the tip 111 of the endoscopic catheter. The slender endoscopic catheter 1 includes a head 11, a middle section 12, and a tail 13. The probing component 112 is usually located near the tip 111 of the endoscopic catheter. The probing component 112 typically includes a lens, an optical window, and pressure and temperature sensors. The tail 13 of the endoscopic catheter is connected to a handle H for the user to operate and hold. The handle H is hollow and continues with the working channel 10 of the endoscopic catheter 1. The handle H also has a working channel side branch H3 for guide wires or optical fibers to pass through and a handle side branch H2 for connecting a negative pressure suction device. The working channel opens outward. The port 102 is located on the side branch H2 of the handle. The handle H is also equipped with an adjustment body H1 for adjusting the degree and / or direction of bending of a portion of the head 11 of the endoscope catheter 1. The sheath 3 is sleeved outside the endoscope catheter 1 during use. The hollow sheath 3 has an inner lumen 30. The slender sheath 3 includes a sheath head 31, a middle part 32, and a tail 33. The sheath 3 has an inner opening 301 that enters the body during use and an outer opening 302 located outside the body. In the embodiment, the sheath 3 is also provided with a sheath side branch 34, which has a sheath side branch lumen 340. The sheath side branch 34 can be connected to the infusion device (figure omitted). When the sheath side branch 34 is connected to the infusion device, external fluid can enter the sheath lumen 30 through the sheath side branch lumen 340, then enter the human body through the endoscope sheath gap 300 and finally through the sheath opening 301. The tail of the sheath 33 is provided with a sealing plug C, and the endoscope catheter 1 enters the sheath lumen 30 through the sealing plug C.

[0054] A cylindrical negative pressure stone basket 2 is fitted onto the head 11 of the endoscope catheter. The inner cavity 20 of the cylindrical negative pressure stone basket has an external opening 202 and an internal opening 201. The external opening 202 and the connecting portion 22 of the negative pressure stone basket are fitted onto the area near the tip 111 of the head 11 of the endoscope catheter 1. The receiving portion 21 of the negative pressure stone basket protrudes from the tip 111 of the endoscope catheter. The internal opening 201 of the negative pressure stone basket is the external opening of the inner cavity 210 of the receiving portion. The probing component 112 at the tip 111 of the endoscope catheter 1 and the internal opening 101 of the working channel 10 of the endoscope catheter 1 are located at the bottom of the inner cavity 210 of the receiving portion. Multiple water inlet channels 211 are provided near the internal opening 201 of the negative pressure stone basket, and these channels are distributed circumferentially around the internal opening 201. Figure 1BAs shown, water can enter the inlet channel 211 through the outer opening 2112 of the inlet channel due to the negative pressure of the inner cavity 210 of the negative pressure stone basket, and then enter the inner cavity 210 of the negative pressure stone basket through the inner opening 2111 of the inlet channel. The negative pressure stone basket 2 can be molded from optical grade silicone rubber and / or optical grade resin, and can be rigid or flexible, or a rigid body but the opening 201 area inside the negative pressure stone basket is a flexible structure.

[0055] During laser lithotripsy operations, such as Figure 1B As shown, the stone S is located in a renal calyx K1 of the kidney K. Water is introduced into the sheath gap 300 between the sheath 3 inserted into the renal pelvis K0 and the endoscope catheter 1. The working channel 10 of the endoscope catheter is connected to a negative pressure device (not shown). The opening 201 of the negative pressure stone basket is close to or close to the target stone S. The optical fiber L extends from the opening 101 of the working channel of the endoscope catheter 1 to touch or be near the target stone S and release energy to break the stone S. The water flow is continuously drawn in by the negative pressure and enters the inner cavity 210 of the negative pressure stone basket through the water inlet channel 211. The stone powder S1 with a diameter of about 250 micrometers and the heat energy generated by the laser are continuously discharged to the outside of the body through the working channel 10 of the endoscope catheter with the water flow. This greatly improves the stone fragmentation efficiency while ensuring that the high-temperature water does not come into contact with the urinary tract mucosa throughout the process, completely eliminating the risk of high temperature damage during the operation.

[0056] The negative pressure stone basket has an outward-spreading skirt 212 in the inner opening 201. The outward-spreading skirt 212 is preferably made of a flexible material. The outward-spreading skirt 212 makes the surface area of ​​the inner opening 201 of the negative pressure stone basket larger than the average cross-sectional area of ​​the inner cavity 210 of the negative pressure stone basket. In order to facilitate outward deformation during use, the outward-spreading skirt 212 can be smooth or wrinkled (figure not shown). The wrinkled outward-spreading skirt 212 is easier to fit with the stone S.

[0057] Even without the outward-spreading skirt 212, the negative pressure stone basket can still absorb the original target stone S through the flexible inner opening area and move it to a favorable position for stone fragmentation, such as moving it from the lower calyx of the kidney to the upper calyx of the kidney. It is convenient to use and reduces the dependence on operating space, replacing the traditional stone basket.

[0058] During lithotripsy, the flexible inner opening area or outward skirt 212 of the negative pressure stone basket partially covers the target stone before the laser fiber contacts or approaches the stone S, which can continuously release laser energy. The working channel 10 of the endoscope catheter is connected to negative pressure, and the cooling and flushing water delivered by the endoscope sheath gap 300 flows into the inner cavity 20 of the negative pressure stone basket through the water inlet channel 211 distributed around the inner opening of the negative pressure stone basket. The heat generated by the laser and the stone powder with a diameter of about 250 micrometers are continuously discharged to the outside of the body through the working channel.

[0059] After the sealing plug C is opened, the negative pressure stone basket 2 can be removed from the sheath tube 3. The negative pressure stone basket 2 can be replaced or its inner cavity can be cleaned of stone debris before being placed back into the sheath tube 3.

[0060] The "inward-retracting" irrigation fluid flow mode of this invention "retracts" the stone powder into the negative pressure stone basket, which helps to achieve stone removal at any time and saves surgical time. In contrast, the traditional "outward-releasing" irrigation fluid flow mode scatters the stone powder everywhere, making it difficult to remove.

[0061] Because the endoscope sheath gap 300 delivers cooling and flushing water, and the transverse cross-sectional area of ​​the endoscope sheath gap 300 is larger than the transverse cross-sectional area of ​​the endoscope catheter working channel 10, the water supply capacity is superior. By setting a safe irrigation pressure, such as setting a maximum irrigation pressure below 30 mmHg, the flow rate is adjusted by negative pressure, which completely eliminates the risk of high pressure in laser lithotripsy, eliminates the need for pressure monitoring, and greatly saves surgical costs.

[0062] Because the transverse cross-sectional area of ​​the sheath gap 300 is larger than the transverse cross-sectional area of ​​the working channel 10 of the endoscope catheter, the water supply capacity is sufficient. A smaller diameter sheath 3 can be selected to be used with the endoscope catheter 1, which significantly reduces the damage of the sheath 3 to the urinary tract.

[0063] Example 2:

[0064] like Figure 2A-2C As shown, the biggest difference from Example 1 is that, in order to improve the cooling and flushing efficiency of the water flow, the water inlet channel 211 is oriented towards the opening 201 inside the negative pressure stone basket, thereby inducing the water flow to be directed towards the opening 201 inside the negative pressure stone basket. That is, the position of the inner opening 2111 of the water inlet channel is closer to the opening 201 inside the negative pressure stone basket than the position of the outer opening 2112 of the water inlet channel, so that the water flow direction is directed towards or closer to the stone fragmentation position of the laser fiber L.

[0065] Multiple water inlet channels 211 are further distributed around the outward-spreading skirt 212, forming a double-ring water inlet zone, which increases the total area of ​​the water inlet and ensures smooth water flow.

[0066] like Figure 2B As shown, another type of water inlet structure is that the outward-spreading skirt 212 is provided with multiple water inlet gaps 2120. The multiple water inlet gaps 2120 are distributed around the circumference of the outward-spreading skirt 212, which increases the total area of ​​the water inlet while also preventing the stone powder S1 from escaping outward.

[0067] Figure 2C This shows a structure where the thickness of the outward-spreading skirt 212 is lower than the thickness of the main body of the negative pressure stone basket 2. This makes it easier for the outward-spreading skirt 212 to deform when it is close to the stone S, and better allows the opening 201 inside the negative pressure stone basket to be blocked by the stone S in the reverse direction, thus preventing the escape of the stone powder S1 (figure omitted).

[0068] Example 3:

[0069] like Figure 3A As shown, the negative pressure stone basket 2 has continuous or intermittent weak bands 213 distributed around its water inlet channel 211. In this example, a groove-shaped weak band 213 is shown. One groove-shaped weak band 213 is provided at a relative position on each of the inner and outer surfaces of the negative pressure stone basket 2. Figure 3B As shown, the stone S is pressed against the opening 201 area inside the negative pressure stone basket 2. The opening 201 area inside the negative pressure stone basket 2 deforms outward along the weak zone 213. The communication between the water inlet channel 211 and the inner cavity 20 of the negative pressure stone basket is blocked by the stone S. The negative pressure of the inner cavity 20 of the negative pressure stone basket can directly act on the stone S without being weakened by the water inlet channel 211, which is conducive to adsorbing and moving the stone S.

[0070] Figure 3C Another structure is shown, where the upper part of the negative pressure stone basket receiving part 21 is folded. The upper part 214 of the folded negative pressure stone basket receiving part is provided with circumferentially distributed water inlet channels 211. When in use, the stone S is first adsorbed and moved. When the laser breaks up the stone, the folded area 214 is unfolded to expose the multiple circumferentially distributed water inlet channels 211.

[0071] Example 4:

[0072] like Figure 4A To prevent large stone fragments S2 generated during the lithotripsy process from blocking the opening 101 of the working channel, this example also includes a thin, transparent isolator 215 located in the inner cavity 210 of the negative pressure stone basket. The isolator 215 divides the inner cavity 210 of the negative pressure stone basket into an upper cavity 2101 and a lower cavity 2102. The isolator 215 has an optical fiber hole 215L for the optical fiber L to pass through and multiple interception holes 2150. The cross-sectional area of ​​each interception hole 2150 is smaller than the surface area of ​​the opening 101 of the working channel of the endoscope catheter used with it. The large stone fragments S2 with a diameter of about 2 mm generated during the laser lithotripsy process can be retained in the upper cavity 2101 of the negative pressure stone basket and quickly moved out of the body in one go, which greatly saves the operation time.

[0073] like Figure 4B , Figure 4C As shown, for better guidance and to ensure stable operation of the laser fiber L, the fiber aperture 215L extends into a fiber guide tube 2151L. In this example, the fiber guide tube 2151L is straight, and the laser fiber L extends from the opening 2152L on the fiber guide tube.

[0074] Example 5:

[0075] like Figure 5AAs shown, considering the clinical situation where the stone S is located in a relatively remote position, the opening 201 inside the negative pressure stone basket cannot fully contact and seal the stone S, and it is also difficult to move the stone S by negative pressure. One solution is to pre-fabricate the opening 201 inside the negative pressure stone basket to one side or bend to one side (e.g., Figure 5B This helps to fully contact and adsorb stones that have moved to more remote locations.

[0076] In order to synchronously bend the laser fiber L to correct the misalignment of the stone S, such as Figure 5C As shown, the fiber optic guide tube 2151L is curved. The curved fiber optic guide tube 2151L can bend the fiber L, making it easier to reach the stone S located on the curved side.

[0077] The negative pressure stone basket and the integrated negative pressure stone basket endoscopic catheter of the present invention upgrade the laser lithotripsy of the urinary system from intermittent laser release to continuous operation, continuously remove stone powder, shorten the average operation time by 20%-50% in in vitro simulation, and completely eliminate the risks of high temperature and high pressure during operation.

[0078] The negative pressure stone basket and the integrated negative pressure stone basket endoscopic catheter of the present invention can also be used to remove stones, blood clots, secretions and pathological tissues from bile duct stones or other natural cavities.

Claims

1. A negative pressure stone basket (2), the main body of which is cylindrical, the inner cavity (20) of the cylindrical negative pressure stone basket is provided with an outer opening (202) and an inner opening (201), the outer opening (202) and the connecting part (22) of the negative pressure stone basket are sleeved in the area near the top end (111) of the head (11) of the endoscope catheter (1), the receiving part (21) of the negative pressure stone basket protrudes from the top end (111) of the endoscope catheter head, the inner opening (201) of the negative pressure stone basket is the external opening of the inner cavity (210) of the receiving part of the negative pressure stone basket, the probing component (112) of the top end (111) of the endoscope catheter (1) and the inner opening (101) of the working channel (10) of the endoscope catheter (1) are located at the bottom of the inner cavity (210) of the receiving part of the negative pressure stone basket, characterized in that: Multiple water inlet channels (211) are provided near the opening (201) of the negative pressure stone basket. The multiple water inlet channels (211) are distributed around the opening (201) of the negative pressure stone basket. Water can enter the water inlet channel (211) through the outer opening (2112) of the water inlet channel due to the negative pressure of the inner cavity (210) of the negative pressure stone basket, and then enter the inner cavity (210) of the negative pressure stone basket through the inner opening (2111). During laser lithotripsy, the sheath gap (300) between the sheath tube (3) and the endoscope guide tube (1) is opened. Water, the working channel (10) of the endoscope catheter is connected to negative pressure, the opening (201) of the negative pressure stone basket is close to or close to the target stone (S), the optical fiber (L) extends from the opening (101) of the working channel of the endoscope catheter (1) to touch or be near the target stone (S) and release energy to break the stone (S), the water flow is continuously attracted by the negative pressure and enters the inner cavity (210) of the negative pressure stone basket through the water inlet channel (211), and the stone powder (S1) and the heat energy generated by the laser are discharged to the outside of the body with the water flow through the working channel (10) of the endoscope catheter.

2. The negative pressure stone basket (2) according to claim 1, characterized in that: The inner opening (201) of the negative pressure stone basket is provided with an outward-spreading skirt (212), which makes the surface area of ​​the inner opening (201) of the negative pressure stone basket larger than the average cross-sectional area of ​​the inner cavity (210) of the negative pressure stone basket.

3. The negative pressure stone basket (2) according to claim 1, characterized in that: The negative pressure stone basket has an opening (201) with an outward-spreading skirt (212), and multiple water inlet channels (211) are distributed around the outward-spreading skirt (212), and / or the outward-spreading skirt (212) has multiple water inlet gaps (2120), which are distributed around the outward-spreading skirt (212).

4. The negative pressure stone basket (2) according to claim 1, characterized in that: The water inlet channel (211) faces the opening (201) inside the negative pressure stone basket. That is, the position of the inner opening (2111) of the water inlet channel is closer to the opening (201) inside the negative pressure stone basket than the position of the outer opening (2112) of the water inlet channel, so that the water flow is closer to the stone breaking position of the laser fiber (L).

5. The negative pressure stone basket (2) according to claim 1, characterized in that: The negative pressure stone basket (2) has a continuous or intermittent weak band (213) distributed around its water inlet channel (211) below it. The weak band (213) makes it easy for the part of the negative pressure stone basket (21) with the water inlet channel (211) to expand outward or fold.

6. The negative pressure stone basket (2) according to claim 1, characterized in that: The upper part of the negative pressure stone basket receiving part (21) is folded, and the upper part (214) of the folded negative pressure stone basket receiving part is provided with a water inlet channel (211) distributed around the perimeter.

7. The negative pressure stone basket (2) according to claim 1, characterized in that: It also includes a thin, transparent isolator (215) located in the inner cavity (210) of the negative pressure stone basket receiving part. The isolator (215) separates the inner cavity (210) of the negative pressure stone basket receiving part into an upper cavity (2101) and a lower cavity (2102) of the negative pressure stone basket receiving part. The isolator (215) is provided with an optical fiber hole (215L) for an optical fiber (L) to pass through and multiple interception holes (2150). The cross-sectional area of ​​each interception hole (2150) is smaller than the surface area of ​​the inner opening (101) of the working channel of the endoscope catheter used in the matching process.

8. The negative pressure stone basket (2) according to claim 7, characterized in that: The fiber optic aperture (215L) also extends into a fiber optic guide tube (2151L), which is either curved or straight.

9. The negative pressure stone basket (2) according to claim 1, characterized in that: The opening (201) inside the negative pressure stone basket is slanted to one side or bent to one side.

10. An integrated negative pressure stone basket endoscopic catheter (1), characterized in that: The endoscope catheter (1) has a negative pressure stone basket (2) as described in claims 1-9 pre-positioned at its head (11) tip (111).

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