Medical flushing suction tube utilizing Venturi effect

Abstract

The invention provides a medical flushing suction tube utilizing the Venturi effect, and relates to the field of medical instruments, the medical flushing suction tube comprises a consumable main body and a spray head mechanism, the consumable main body comprises an outer tube and an inner tube arranged in the outer tube, and the outer tube and the inner tube are concentrically arranged; the spray head mechanism comprises a liquid discharge pipe in sealed communication with the inner pipe, a spherical shell covering the periphery of the liquid discharge pipe and a liquid injection pipe arranged on the spherical shell in a communicating mode, the spherical shell is in sealed communication with one end of the outer pipe, and the end, away from the inner pipe, of the liquid discharge pipe penetrates through the spherical shell and extends out of the spherical shell; the pipe wall of the liquid discharging pipe is connected with the spherical shell in a sealed mode, the end, away from the liquid discharging pipe, of the inner pipe is located in the outer pipe, streamline-shaped protruding rings are fixed to the inner wall of the outer pipe and the outer wall of the inner pipe, the protruding rings are arranged away from the spherical shell, and the protruding rings on the inner wall of the outer pipe directly face the protruding rings on the outer wall of the inner pipe. According to the device, debris in the body of a patient can be flushed and discharged without an external negative pressure source.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a medical flushing and suction tube utilizing Venturi effect. BACKGROUND

[0002] Currently, the mainstream method for removing crushed stones, tissues or blood clots during surgeries such as percutaneous nephrolithotomy, hysteroscopy and laparoscopy is to rely on negative pressure suction or to use the pressure generated in the limited space of the organ to naturally discharge.

[0003] As for the negative pressure suction method, the mainstream suction tube has a single lumen structure. If the tube end needs to be connected to a perfusion tube and a negative pressure tube at the same time, a Y-shaped structure is formed to connect the perfusion tube and the negative pressure tube respectively. The perfusion or negative pressure suction is controlled by toggling a switch, which cannot achieve simultaneous perfusion and suction. A small number of suction tubes with a double lumen structure significantly reduce the inner diameter of the suction tube by simply dividing the lumen into two parts, which makes the suction tube prone to being blocked by debris. In order to prevent blockage and increase cleaning efficiency, the outer diameter has to be enlarged, which limits its application in minimally invasive surgeries. Moreover, the existing negative pressure suction process requires an external negative pressure suction device, which is complex and costly. The connection and deployment of the split type instrument are cumbersome, and the instrument needs to be frequently replaced or dredged after being blocked, which prolongs the operation time. In addition, external strong negative pressure may attract normal tissues around the tube into the tube, causing tissue ischemia and necrosis, damage or rupture, and other serious problems. SUMMARY

[0004] In order to overcome the technical problems of the prior art described above, the present application provides a medical flushing and suction tube utilizing Venturi effect.

[0005] The medical flushing and suction tube utilizing Venturi effect provided by the present application adopts the following technical solution: A medical flushing and suction tube utilizing Venturi effect, comprising a consumable main body and a spray head mechanism connected to one end of the consumable main body, wherein the consumable main body comprises an outer tube and an inner tube arranged in the outer tube, the outer tube and the inner tube are arranged concentrically, the spray head mechanism comprises a liquid discharge tube in sealed communication with the inner tube, a spherical shell arranged on the outer periphery of the liquid discharge tube, and a liquid injection tube arranged in communication on the spherical shell, the spherical shell is in sealed communication with one end of the outer tube, the end of the liquid discharge tube away from the inner tube penetrates the spherical shell and extends to the outside of the spherical shell, the liquid discharge tube wall is in sealed connection with the spherical shell, the end of the inner tube away from the liquid discharge tube is located in the outer tube, and the inner wall of the outer tube and the outer wall of the inner tube are both fixed with a streamlined convex ring, the convex ring is arranged away from the spherical shell, and the convex ring on the inner wall of the outer tube is arranged opposite to the convex ring on the outer wall of the inner tube.

[0006] Furthermore, an annular perfusion channel is formed between the inner tube and the outer tube, and the liquid injection tube is inclined towards the annular perfusion channel.

[0007] Further, the convex ring is located at the end of the inner tube.

[0008] Further, the outer tube is provided with a trumpet barrel coaxially fixed in the outer tube at the end of the outer tube away from the spherical shell, the small end of the trumpet barrel extends into the outer tube and is located outside the port of the inner tube, the large end is sealingly connected with the inner wall of the end of the outer tube, and the caliber of the small end of the trumpet barrel is larger than the caliber of the inner tube.

[0009] Further, the end of the outer tube away from the spherical shell is provided with an expanded port.

[0010] Further, the end of the outer tube away from the spherical shell is provided with a reduced port, and the caliber of the reduced port is not less than the caliber of the inner tube.

[0011] Further, the end of the consumable body close to the nozzle mechanism is provided with a hard pipe, and the end away from the nozzle mechanism is provided with a soft pipe, and the hard pipe and the soft pipe are sealingly connected.

[0012] Further, the support structure is arranged between the outer tube and the inner tube for supporting the inner tube coaxially in the outer tube.

[0013] Further, the end of the consumable body away from the nozzle mechanism is coated with a developing marker.

[0014] Further, the consumable body and the nozzle mechanism are detachably connected.

[0015] In summary, the present application has the following beneficial technical effects: 1. By arranging the spherical shell and making the liquid injection pipe inclined to point to the annular perfusion channel, the liquid enters the spherical shell along the inner wall of the spherical shell through the liquid injection pipe and forms a spiral flow to quickly flow to the annular perfusion channel. At this time, the conduction pressure of the liquid in the flushing suction pipe is relatively uniform, and when the liquid flows through the convex ring through the annular perfusion channel, the perfusion channel becomes narrow to form a Venturi effect, so that the liquid sprayed through the annular perfusion channel forms a high-speed annular water column, and a stable negative pressure is formed at the center of the water column, so that the debris is quickly sucked into the inner tube, solving the defect of the need for an external negative pressure source in the prior art. 2. When the outer tube is provided with a trumpet barrel at the end thereof, most of the liquid flows through the trumpet barrel and forms an annular water column, and a small part of the liquid flows between the outer wall of the trumpet barrel and the inner wall of the outer tube and flows back through the outer wall of the trumpet barrel, thereby enhancing the Venturi effect of the flushing suction pipe and helping the debris to be quickly wrapped in the fluid into the inner tube. BRIEF DESCRIPTION OF DRAWINGS

[0016] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0018] Figure 2 This is a partial structural diagram of an embodiment of the present application in which the end of the outer tube away from the spherical shell is a straight opening.

[0019] Figure 3 This is a partial structural diagram of an embodiment of the present application, showing that the end of the outer tube away from the spherical shell is straight and has a flared tube.

[0020] Figure 4 This is a partial structural diagram of an embodiment of the present application, showing that the end of the outer tube away from the spherical shell is narrowed.

[0021] Figure 5 This is a partial structural diagram of an embodiment of the present application, showing that the end of the outer tube away from the spherical shell is flared.

[0022] Reference numerals in the attached diagram: 1. Outer tube; 2. Inner tube; 3. Drain tube; 4. Spherical shell; 5. Injection tube; 6. Annular injection channel; 7. Convex ring; 8. Support structure; 9. Horn tube; 10. Flow meter. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0024] This application discloses a medical irrigation and suction tube utilizing the Venturi effect. (See also...) Figure 1 and Figure 2A medical irrigation and suction tube utilizing the Venturi effect includes a consumable body and a nozzle mechanism connected to one end of the consumable body. The consumable body includes an outer tube 1 and an inner tube 2 disposed inside the outer tube 1. The outer tube 1 and the inner tube 2 are concentrically arranged, forming an annular irrigation channel 6 between the inner tube 2 and the outer tube 1. The interior of the inner tube 2 is a suction channel. The nozzle mechanism includes a drain pipe 3 sealed and connected to the inner tube 2, a spherical shell 4 covering the outer periphery of the drain pipe 3, and an injection pipe 5 connected to the spherical shell 4. One end of the spherical shell 4 protrudes to form a cylindrical structure and is sealed and connected to one end of the outer tube 1. The end of the drain pipe 3 away from the inner tube 2 passes through the spherical shell 4 and extends outside the spherical shell 4, and the wall of the drain pipe 3 is sealed and connected to the spherical shell 4. The injection pipe 5 is inclined and points towards the annular irrigation channel 6. The end of the inner tube 2 away from the drain pipe 3 is located inside the outer tube 1, and the distance between the end of the inner tube 2 and the end of the outer tube 1 is 0.8-2 times the outer diameter of the outer tube 1. The outer tube 1 and the inner tube 2 are made of medical-grade PVC, PP or PC material at the end near the nozzle mechanism, and medical-grade silicone material at the end away from the nozzle mechanism. The connection between the rigid tube and the flexible tube is sealed.

[0025] Since the main body of the consumable needs to be inserted into the patient's body, and considering the reusability of the nozzle mechanism, the main body of the consumable and the nozzle mechanism are detachably connected, referring to... Figure 1 The outer tube 1 is detachably connected to the cylindrical structure at one end of the spherical shell 4, and the inner tube 2 is detachably connected to the drain pipe 3. Specifically, the detachable connections are configured such that the outer tube 1 and the cylindrical structure at one end of the spherical shell 4, and the inner tube 2 and the drain pipe 3, form a pagoda-shaped connection. That is, the end of the outer tube 1 near the spherical shell 4 is configured with a pagoda-shaped conical structure for sealing and insertion into the cylindrical structure at one end of the spherical shell 4; the end of the inner tube 2 near the drain pipe 3 is also configured with a pagoda-shaped conical structure for sealing and insertion into the drain pipe 3. When the consumable body becomes clogged during surgery or needs to be removed for disinfection and disposal after surgery, simply pull the consumable body and the nozzle mechanism to quickly remove the consumable body from the nozzle mechanism. Furthermore, the end of the consumable body away from the nozzle mechanism is coated with a contrast agent located at the end of the inner tube 2 and / or the outer tube 1, allowing for quick and accurate insertion of the consumable body into the patient's body when used in conjunction with other detection instruments.

[0026] Reference Figure 1 and Figure 2Both the inner wall of the outer tube 1 and the outer wall of the inner tube 2 are circumferentially fixed with streamlined convex rings 7. The convex rings 7 are located away from the spherical shell 4. In this embodiment, the convex rings 7 on the outer wall of the inner tube 2 are located at the end of the inner tube 2, and the convex rings 7 on the inner wall of the outer tube 1 and the outer wall of the inner tube 2 are directly opposite each other. This makes the injection channel 6 narrow when the liquid flows through the convex rings 7, thereby increasing the flow rate of the liquid and reducing the pressure at the center of the annular water column, thus forming a Venturi effect and realizing the automatic discharge of debris.

[0027] During the procedure, the medical irrigation and aspiration tube is first inserted into the patient's body through the incision and aligned with the area to be irrigated and aspirated. Then, the saline tubing is connected to the infusion tube 5. The infusion pump is controlled according to the surgical needs, injecting saline into the infusion tube 5 at an appropriate flow rate. Because the infusion tube 5 is inclined towards the annular infusion channel 6, the saline enters the spherical shell 4 through the infusion tube 5 along the inner wall of the spherical shell 4, forming a spiral flow that rapidly flows towards the annular infusion channel 6. Guided by the inner wall of the spherical shell 4, the conduction pressure of the saline within the irrigation and aspiration tube is relatively uniform. When the liquid flows through the annular infusion channel 6 past the convex ring 7, the infusion channel 6 narrows, thereby increasing the liquid flow rate and reducing the pressure at the center of the resulting annular water column, thus creating the Venturi effect. Since the outer tube 1 and the inner tube 2 are concentrically arranged and the end of the inner tube 2 that is far from the drain pipe 3 is located inside the outer tube 1, the tissue fragments and turbid liquid of the area to be rinsed and aspirated are quickly drawn into the inner tube 2 and flow along the inner tube 2 toward the drain pipe 3, and finally discharged from the body through the drain pipe 3.

[0028] It is worth noting that this device is applied to organs such as the renal pelvis, ureter, and bladder, which are all elastically confined spaces. The ejected fluid enters organs already filled with fluid, resulting in high fluid resistance and rapid jet velocity decay, making it extremely difficult to form long-distance splashing. Based on the wall effect and fluid entrainment principle, after the annular high-speed fluid is ejected, a low-pressure zone forms at the center, causing the water flow to rapidly contract and converge towards the central axis. This converging flow field forms a short "hydraulic sealing cone" in front of the nozzle, then quickly deflects back into the inner tube 2. This flow field structure physically restricts the direct impact of the water flow on distal tissues, effectively creating a localized cleaning vortex zone rather than a penetrating jet. Simultaneously, within the confined space, the entry of the perfusion fluid causes a slight increase in intracavitary pressure. The inner tube 2 of this device, connected to the outside (atmosphere or a negative pressure bottle), is the only low-resistance release channel within this enclosed space. Therefore, the liquid will not splash randomly within the cavity but will inevitably follow the "path of least resistance" principle, flowing naturally towards and into the inner tube 2. This is the effect of submerging the jet and guiding the confined space. Based on this "natural reflux", this device utilizes the principle of jet pump to enhance the stone removal efficiency, that is, the Venturi effect does not only occur in the throat of the convex ring 7. When the fluid in the annular perfusion channel 6 is ejected, it undergoes a violent momentum exchange with the low-speed turbid liquid (the ejected fluid) in the mixing zone, causing the high-speed outer fluid to act like a conveyor belt, "enveloping" the debris in the center through the shear layer and accelerating it into the inner tube 2, thus promoting the rapid entrainment and discharge of tissue fragments and turbid fluid from the body.

[0029] To expand the application scenarios of medical irrigation and suction tubes, refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5The end of the outer tube 1 away from the spherical shell 4 can be straight, narrowed, or flared. When the end of the outer tube 1 away from the spherical shell 4 is straight, both the inner and outer walls of the outer tube 1 are straight along its length. To enhance the Venturi effect produced by the outer tube 1, a bell 9 can be installed on the inner wall of the end of the outer tube 1. The bell 9 is coaxial with the outer tube 1. The small end of the bell 9 extends into the outer tube 1 and is located on one side of the port of the inner tube 2. The large end is sealed to the inner wall of the end of the outer tube 1 and integrally formed with the outer tube 1. At the same time, the diameter of the small end of the bell 9 is larger than the diameter of the inner tube 2. At this time, an angle is formed between the outer wall of the bell 9 and the inner wall of the outer tube 1. When the liquid flows to the port of the outer tube 1 in the annular injection channel 6, most of the liquid flows through the bell 9 and forms an annular water column. A small portion of the liquid flows between the outer wall of the bell 9 and the inner wall of the outer tube 1 and flows back through the outer wall of the bell 9, thereby driving the debris to flow towards the inner tube 2. This enhances the Venturi effect of the flushing suction tube and helps to attract and discharge the debris. When the end of the outer tube 1 furthest from the spherical shell 4 is constricted, the diameter of the constricted end should not be less than the diameter of the inner tube 2. The shape of the outer tube 1 port can be selected based on the amount of debris to be expelled from the patient's body, the size of the debris, the distribution range of the debris, and the patient's vital signs, ensuring that the debris is flushed out of the patient's body as efficiently and safely as possible without clogging the consumable body. For monitoring whether the consumable body is clogged, a flow meter 10 can be installed on the drain pipe 3. The flow meter 10 is remotely controlled. After liquid is injected at a constant rate through the injection pipe 5, the flow meter 10 monitors the flow rate of the drain pipe 3 in real time. If the flow rate of the drain pipe 3 is unstable or abnormally low, it indicates that the consumable body may be clogged.

[0030] Because medical irrigation and suction tubes are mostly used in minimally invasive surgeries, the walls of the inner tube 2 and outer tube 1 are relatively thin. The ends of the outer tube 1 and inner tube 2 furthest from the nozzle mechanism are made of medical-grade silicone tubing. During the initiation and pausing of liquid injection, the inner tube 2 and outer tube 1 are prone to relative misalignment, potentially leading to non-concentricity between them. Therefore, referring to... Figure 1 A support structure 8 is provided between the outer tube 1 and the inner tube 2 to support the inner tube 2 coaxially within the outer tube 1. The support structure 8 can be multiple medical-grade plastic rods or medical-grade plastic pads. In this embodiment, the support structure 8 is set as multiple medical-grade plastic pads. The multiple plastic pads are distributed circumferentially along the annular perfusion channel 6 and are arranged in multiple sets along the length of the annular perfusion channel 6. The two ends of the plastic pads are fixedly connected to the outer wall of the inner tube 2 and the inner wall of the outer tube 1, respectively, so that the support structure 8 can stably support the inner tube 2 and the outer tube 1, ensuring that the inner tube 2 and the outer tube 1 bend synchronously as a whole, avoiding deformation of the annular perfusion channel 6, and ensuring that the annular water column can be stably formed.

[0031] The implementation principle of a medical irrigation and suction tube utilizing the Venturi effect in this application embodiment is as follows: First, select a suitable outer tube 1 according to the surgical requirements, and seal one end of the inner tube 2 to the port of the drain tube 3. Then, seal one end of the outer tube 1 to the cylindrical structure at one end of the spherical shell 4. At this time, the medical irrigation and suction tube is assembled.

[0032] During the procedure, the medical irrigation and aspiration tube is first inserted into the patient's body through the incision and aligned with the area to be irrigated and aspirated. Then, the saline tubing is connected to the infusion tube 5. The infusion pump is controlled according to the surgical needs to inject saline into the infusion tube 5 at an appropriate flow rate. Since the infusion tube 5 is tilted towards the annular infusion channel 6, the saline enters the spherical shell 4 through the infusion tube 5 along the inner wall of the spherical shell 4 and forms a spiral flow that quickly flows towards the annular infusion channel 6. Guided by the inner wall of the spherical shell 4, the saline solution conducts a relatively uniform pressure within the irrigation and aspiration tube. When the liquid flows through the annular irrigation channel 6 and passes the convex ring 7, the narrowing of the irrigation channel 6 creates a Venturi effect, causing the liquid to spray out through the annular irrigation channel 6 in a high-speed annular water column. A stable negative pressure is formed at the center of the water column. Because the outer tube 1 and the inner tube 2 are concentrically arranged, and the end of the inner tube 2 furthest from the drain tube 3 is located inside the outer tube 1, tissue fragments and turbid fluid from the area to be rinsed and aspirated are rapidly drawn into the inner tube 2 and flow along the inner tube 2 towards the drain tube 3. Finally, the fluid is discharged from the body through the drain tube 3 and collected in a collection container. The entire process does not require an external negative pressure source, and the doctor can control the irrigation flow rate to synchronously regulate the aspiration intensity, ensuring minimal damage to the patient.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medical irrigation and suction tube utilizing the Venturi effect, comprising a consumable body and a nozzle mechanism connected to one end of the consumable body, wherein the consumable body comprises an outer tube and an inner tube disposed within the outer tube, characterized in that, The outer tube and the inner tube are concentrically arranged. The nozzle mechanism includes a drain pipe that is sealed and connected to the inner tube, a spherical shell covering the outer periphery of the drain pipe, and an injection pipe connected to the spherical shell. The spherical shell is sealed and connected to one end of the outer tube. The end of the drain pipe away from the inner tube passes through the spherical shell and extends to the outside of the spherical shell. The wall of the drain pipe is sealed and connected to the spherical shell. The end of the inner tube away from the drain pipe is located inside the outer tube. Streamlined convex rings are fixed on the inner wall of the outer tube and the outer wall of the inner tube. The convex rings are located away from the spherical shell, and the convex rings on the inner wall of the outer tube and the convex rings on the outer wall of the inner tube are directly opposite each other.

2. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The inner tube and the outer tube form an annular injection channel, and the injection tube is inclined toward the annular injection channel.

3. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The convex ring is located at the end of the inner tube.

4. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The outer tube is straight at the end away from the spherical shell. A horn is fixed coaxially inside the outer tube. The horn is located at the end of the outer tube away from the spherical shell. The small end of the horn extends into the outer tube and is located outside the inner tube port. The large end is sealed to the inner wall of the outer tube end. The diameter of the small end of the horn is larger than the diameter of the inner tube.

5. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The end of the outer tube furthest from the spherical shell is flared.

6. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The outer tube is constricted at the end away from the spherical shell, and the diameter of the constricted end is not less than the diameter of the inner tube.

7. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The consumable body is configured with a rigid pipe at one end near the nozzle mechanism and a flexible pipe at the other end away from the nozzle mechanism, with the rigid pipe and the flexible pipe being sealed and connected.

8. A medical irrigation and suction tube utilizing the Venturi effect according to claim 7, characterized in that, A support structure is provided between the outer tube and the inner tube to support the inner tube coaxially within the outer tube.

9. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The end of the consumable body away from the nozzle mechanism is coated with a developing marker.

10. A medical irrigation and suction tube utilizing the Venturi effect according to claim 1, characterized in that, The consumable body and the nozzle mechanism are detachably connected.

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