A stone suction mirror for percutaneous nephroscopic surgery
By incorporating an expandable sleeve and filter structure within the sheath, the problem of the small inlet diameter of the sheath is solved, thereby improving the efficiency of gravel intake and preventing equipment blockage.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- THE SECOND AFFILIATED HOSPITAL OF ANHUI MEDICAL UNIV
- Filing Date
- 2025-03-07
- Publication Date
- 2026-06-23
Smart Images
Figure CN224387495U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of medical devices, specifically relating to a lithotripsy endoscope for percutaneous nephrolithotomy. Background Technology
[0002] Percutaneous nephrolithotomy (PCNL) is a common minimally invasive surgical method for treating kidney stones and upper ureteral stones. A lithoscopic endoscope is used as a key instrument to aspirate fragments and flush out the stones. During the procedure, a negative pressure suction sheath is introduced. Guided by a guidewire, the sheath is inserted into the ureteral stone removal site, establishing a channel for equipment access. During the procedure, a flexible ureteroscope, endoscope, laser fiber, and manipulation cables are introduced through the sheath to the ureter, bladder, or renal pelvis for relevant surgical procedures. A negative pressure device is connected to the end of the sheath. During laser lithotripsy, the fragmented stones are simultaneously fragmented and drawn into the sheath using negative pressure suction. The sheath is then used for stone aspiration and removal. To facilitate insertion into the ureteral stone removal site, the sheath's tip is typically cylindrical, and the diameter of the suction port at the tip is small, making it difficult to aspirate fragmented stones. Therefore, current techniques suffer from the problem of a small suction port diameter and difficulty in aspirating fragmented stones. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a lithotripsy endoscope for percutaneous nephrolithotomy, which solves the problems of small sheath suction diameter and difficulty in aspirating lithotripsy in the existing technology.
[0004] The objective of this utility model can be achieved through the following technical solutions:
[0005] The lithotripsy endoscope used in percutaneous nephrolithotomy includes a sheath with openings at both ends;
[0006] A sleeve placed coaxially is fixedly connected to either end of the sheath. The sleeve is made of elastic material and both ends of the sleeve are open.
[0007] Multiple bimetallic strips are fixed in the sleeve wall, and the multiple bimetallic strips are evenly distributed in a ring around the central axis of the sleeve.
[0008] Each bimetallic strip includes a first metal strip and a second metal strip fixed to the end of the sheath tube. The first metal strip and the second metal strip are both placed coaxially with the sheath tube. The first metal strip and the second metal strip are attached to each other and fixedly connected. The second metal strip is located on the side of the first metal strip away from the central axis of the sheath tube, and the coefficient of thermal expansion of the first metal strip is greater than that of the second metal strip.
[0009] The sheath has a heating unit inside its wall for heating the bimetallic strip.
[0010] The principle and effect of the above technical solution are as follows:
[0011] After the sleeve end of the sheath is inserted into the ureteral stone removal site, the bimetallic strip is heated by the heating unit. Since the thermal expansion coefficient of the first metal strip is greater than that of the second metal strip, the bimetallic strip gradually bends away from the sheath end and away from the central axis of the sheath. The bimetallic strip causes the sleeve to deform, so that the diameter of the sleeve gradually increases from the end near the sheath end to the end away from the sheath end. By increasing the diameter of the sleeve away from the sheath end, it is easier for negative pressure to suck in the stone and improve the stone suction efficiency.
[0012] The heating unit includes multiple heating wires, and the number of heating wires and bimetallic strips are equal and correspond one-to-one. The heating wires are all fixed between the first and second metal strips of the corresponding bimetallic strips. The sheath tube has wires in its tube wall, and the heating wires are all electrically connected to the wires. The wires pass through the peripheral wall of the sheath tube away from the sleeve end and extend to the outside of the sheath tube.
[0013] The first metal sheet is made of copper, and the second metal sheet is made of iron;
[0014] Elastic materials include at least one of silicone, polyurethane, or thermoplastic elastomers;
[0015] The sheath is a hollow tube with open ends, and a collection chamber can be detachably connected to either end of the sheath.
[0016] The collection chamber is a sealed shell with a hollow interior, and the sheath is connected to the interior of the collection chamber.
[0017] The collection chamber is equipped with a negative pressure connector, which is connected to the inside of the collection chamber.
[0018] A filter screen is fixed at the end of the negative pressure connector near the collection chamber;
[0019] The outer peripheral wall of the sheath near the collection chamber is provided with a threaded groove, and a collar is fixedly connected to the collection chamber. The inner peripheral wall of the collar is provided with threaded teeth that are compatible with the threaded groove.
[0020] The explanations of the nouns, conjunctions, or adjectives used in the above technical solutions are as follows:
[0021] Fixed connection: refers to a connection method in which two or more components are tightly connected together by welding, gluing or other methods, and cannot be easily separated.
[0022] Detachable connection: refers to a connection method that allows two or more components to be easily connected and separated when needed, enabling them to be connected and disassembled quickly and conveniently.
[0023] The beneficial effects of this utility model are:
[0024] 1. After the sleeve end of the sheath is inserted into the ureteral stone removal site, the bimetallic strip is heated by the heating unit. Since the thermal expansion coefficient of the first metal strip is greater than that of the second metal strip, the bimetallic strip gradually bends away from the sheath end and away from the central axis of the sheath. The bimetallic strip causes the sleeve to deform, so that the diameter of the sleeve gradually increases from the end near the sheath end to the end away from the sheath end. By increasing the diameter of the sleeve away from the sheath end, it is easier for the negative pressure to suck the stone in and improve the stone suction efficiency.
[0025] 2. The collection chamber facilitates the collection and treatment of stones discharged from the sheath; the negative pressure connector facilitates connection with existing negative pressure equipment, and the filter screen prevents stones from being sucked into the negative pressure equipment, thus avoiding blockage. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0028] Figure 2 This is a schematic diagram of a portion of the filter screen structure of this utility model;
[0029] Figure 3 This is a schematic diagram of the sleeve structure of this utility model;
[0030] Figure 4 This is a partial structural diagram of the first metal sheet of this utility model. Detailed Implementation
[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.
[0032] This combination Figures 1 to 4This document describes an embodiment of a lithotripsy endoscope for percutaneous nephrolithotomy. Specifically, the endoscope is constructed as a split structure, comprising a sheath 100, a sleeve 200, a bimetallic strip 300, and a heating unit. After the sleeve 200 end of the sheath 100 extends into the ureteral stone removal site, the bimetallic strip 300 is heated by the heating unit. Since the coefficient of thermal expansion of the first metal strip 301 is greater than that of the second metal strip 302, the bimetallic strip 300 gradually bends away from the sheath 100 and away from the central axis of the sheath 100. The bimetallic strip 300 causes the sleeve 200 to deform, resulting in a gradual increase in the diameter of the sleeve 200 from the end near the sheath 100 to the end away from the sheath 100. By increasing the diameter of the sleeve 200 away from the sheath 100, it is easier to draw in stones under negative pressure, thereby improving the stone removal efficiency.
[0033] Please refer to Figures 1 to 4 The lithotripsy endoscope used in percutaneous nephrolithotomy includes a sheath 100 with openings at both ends;
[0034] A sleeve 200 placed coaxially is fixedly connected to either end of the sheath 100. The sleeve 200 is made of elastic material and both ends of the sleeve 200 are open.
[0035] Multiple bimetallic strips 300 are fixed in the sleeve wall of the sleeve 200, and the multiple bimetallic strips 300 are evenly distributed in a ring around the central axis of the sleeve 200.
[0036] Each bimetallic strip 300 includes a first metal strip 301 and a second metal strip 302 fixed to the end of the sheath 100. The first metal strip 301 and the second metal strip 302 are both placed coaxially with the sheath 100. The first metal strip 301 and the second metal strip 302 are attached to each other and fixedly connected. The second metal strip 302 is located on the side of the first metal strip 301 away from the central axis of the sheath 100, and the coefficient of thermal expansion of the first metal strip 301 is greater than the coefficient of thermal expansion of the second metal strip 302.
[0037] The sheath 100 has a heating unit in its wall for heating the bimetallic strip 300;
[0038] When in use, the sleeve 200 end of the sheath 100 extends into the ureteral stone removal site, and the end of the sheath 100 away from the sleeve 200 is used to connect to the negative pressure device in the prior art.
[0039] After the sleeve 200 end of the sheath 100 is inserted into the ureteral stone removal site, the bimetallic strip 300 is heated by the heating unit. Since the thermal expansion coefficient of the first metal strip 301 is greater than that of the second metal strip 302, the bimetallic strip 300 gradually bends away from the sheath 100 and away from the central axis of the sheath 100. The bimetallic strip 300 causes the sleeve 200 to deform, so that the diameter of the sleeve 200 gradually increases from the end near the sheath 100 to the end away from the sheath 100. By increasing the diameter of the end of the sleeve 200 away from the sheath 100, it is easier for the negative pressure to suck the stone in, thereby improving the stone suction efficiency.
[0040] The heating unit includes multiple heating wires, and the number of heating wires and bimetallic strips 300 are equal and correspond one-to-one. The heating wires are all fixed between the first metal strip 301 and the second metal strip 302 of the corresponding bimetallic strip 300. The sheath tube 100 is provided with a wire 400 in the tube wall. The heating wires are all electrically connected to the wire 400. The wire 400 passes through the peripheral wall of the end of the sheath tube 100 away from the sleeve 200 and extends to the outside of the sheath tube 100. The heating wires are connected to an external power source through the wire 400, and the heating wires heat the bimetallic strips 300.
[0041] The first metal sheet 301 is made of copper, and the second metal sheet 302 is made of iron. Copper has a larger coefficient of thermal expansion than iron. When the bimetallic sheet 300 is heated, the first metal sheet 301 bends toward the second metal sheet 302.
[0042] Preferably, in this application, the length of the bimetallic strip 300 is 8mm-15mm, and the thickness of the bimetallic strip 300 is 0.3mm-0.5mm, wherein the thickness of the first metal strip 301 is 0.1mm-0.2mm, and the thickness of the second metal strip 302 is 0.2mm-0.3mm. The first metal strip 301 is thinner than the second metal strip 302, making the bimetallic strip 300 easier to bend when heated.
[0043] The elastic material includes at least one of silicone, polyurethane, or thermoplastic elastomer; silicone is preferred, as it has good biocompatibility, high temperature resistance, and elasticity, making it suitable for medical devices.
[0044] Preferably, the thickness between the first metal sheet 301 and the inner peripheral wall of the sleeve 200 is in the range of 0.1mm-0.2mm, and the thickness between the second metal sheet 302 and the outer peripheral wall of the sleeve 200 is in the range of 0.1mm-0.2mm, so as to avoid the sleeve wall of the sleeve 200 being too thick and affecting elastic deformation.
[0045] The sheath 100 is a hollow tube with open ends, and a collection chamber 500 is detachably connected to either end of the sheath 100.
[0046] The collection chamber 500 is a hollow, sealed shell, and the sheath tube 100 is connected to the interior of the collection chamber 500.
[0047] The collection chamber 500 facilitates the collection and processing of stones discharged from the sheath 100.
[0048] The collection chamber 500 is equipped with a negative pressure connector 600, which is connected to the interior of the collection chamber 500. The negative pressure connector 600 facilitates connection with existing negative pressure devices.
[0049] A filter screen 601 is fixed at one end of the negative pressure connector 600 near the collection chamber 500; the filter screen 601 is used to prevent stones from being sucked into the negative pressure equipment and avoid clogging of the negative pressure equipment.
[0050] The outer peripheral wall of the sheath tube 100 near the collection chamber 500 is provided with a threaded groove. A collar 501 is fixedly connected to the collection chamber 500. The inner peripheral wall of the collar 501 is provided with threaded teeth that are compatible with the threaded groove. The detachable connection between the collection chamber 500 and the sheath tube 100 is achieved through the cooperation of the collar 501 and the threaded groove on the sheath tube 100.
[0051] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0052] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims of this utility model.
Claims
1. A lithotripsy endoscope for percutaneous nephrolithotomy, comprising a sheath (100) with openings at both ends, characterized in that: A sleeve (200) is fixedly connected to either end of the sheath (100) and placed coaxially. The sleeve (200) is made of elastic material and both ends of the sleeve (200) are open. Multiple bimetallic strips (300) are fixed in the sleeve (200) wall, and the multiple bimetallic strips (300) are evenly distributed in a ring around the central axis of the sleeve (200); Each bimetallic strip (300) includes a first metal strip (301) and a second metal strip (302) fixed to the end of the sheath (100). The first metal strip (301) and the second metal strip (302) are both placed coaxially with the sheath (100). The first metal strip (301) and the second metal strip (302) are attached to each other and fixedly connected. The second metal strip (302) is located on the side of the first metal strip (301) away from the central axis of the sheath (100). The coefficient of thermal expansion of the first metal strip (301) is greater than that of the second metal strip (302). The sheath (100) has a heating unit in its wall for heating the bimetallic strip (300).
2. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 1, characterized in that, The heating unit includes multiple heating wires, and the number of heating wires and bimetallic strips (300) are equal and correspond one-to-one. The heating wires are all fixed between the first metal strip (301) and the second metal strip (302) of the corresponding bimetallic strip (300). The sheath tube (100) is provided with a wire (400) in the tube wall. The heating wires are all electrically connected to the wire (400). The wire (400) passes through the peripheral wall of the sheath tube (100) away from the sleeve (200) and extends to the outside of the sheath tube (100).
3. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 2, characterized in that, The first metal sheet (301) is made of copper, and the second metal sheet (302) is made of iron.
4. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 3, characterized in that, Elastic materials include at least one of silicone, polyurethane, or thermoplastic elastomers.
5. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 4, characterized in that, The sheath (100) is a hollow tube with open ends, and a collection chamber (500) can be detachably connected to either end of the sheath (100). The collection chamber (500) is a sealed shell with a hollow interior, and the sheath tube (100) is connected to the interior of the collection chamber (500).
6. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 5, characterized in that, The collection chamber (500) is equipped with a negative pressure connector (600), which is connected to the inside of the collection chamber (500).
7. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 6, characterized in that, A filter screen (601) is fixed at one end of the negative pressure connector (600) near the collection chamber (500).
8. The lithotripsy endoscope for percutaneous nephrolithotomy according to claim 7, characterized in that, The sheath (100) has a threaded groove on the outer peripheral wall near the end of the collection chamber (500). A collar (501) is fixedly connected to the collection chamber (500). The inner peripheral wall of the collar (501) has threaded teeth that are compatible with the threaded groove.