Medical Suction Devices

Abstract

To highly efficiently suck and remove a highly viscous internally-stored liquid in a short time in a laparoscopic operation.SOLUTION: A medical suction device 1 for sucking and recovering a stored liquid throughout a body comprises: a suction tube 20 in which an opening 25 is formed near a distal end 23, a proximal end 22 is configured to be connectable to a suction unit 50, and the distal end 23 is inserted into the body; and a liquid delivery tube 30 which has a nozzle 34 at a distal end 33, and in which a proximal end 32 is configured to be connectable to a liquid delivery unit 40 for a solution, and the distal end 33 extends to the opening 25 of the suction tube 20. The suction tube 20 includes: near the distal end 23, a stored liquid drawing part 211 which draws the stored liquid throughout the body from the opening 25 inward the suction tube 20 by a solution ejected from the nozzle 34 of the liquid delivery tube 30; and a mixing part 212 which mixes the stored liquid drawn into the inside of the tube and the ejected solution to form an emulsion formed by dispersing the stored liquid in the solution and transfers the emulsion toward the proximal end 22 of the suction tube.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a medical suction device for suctioning and removing accumulated fluids in lesions and surgical fields during laparoscopic or laparoscopic-assisted surgery, and in particular to a medical suction device used for suction and removing highly viscous accumulated fluids in the body, such as the contents of ovarian cysts. [Background technology]

[0002] In the medical field, laparoscopic or laparoscopic-assisted surgical procedures are increasingly being selected in an effort to reduce invasiveness. Many diseases, such as ovarian cysts, peritonitis, and intraperitoneal bleeding, cause fluid accumulation in the lesion or surgical field, and surgery requires the removal of accumulated fluid by suction (drainage).

[0003] Conventionally, the suction removal of accumulated fluid in the body has been achieved by connecting a suction cannula with a hole at the tip to an external suction device via a suction tube circuit, and then aspirating and removing the accumulated fluid (e.g., Patent Documents 1 to 4). For example, in surgery for ovarian cysts, after isolating the ovarian cyst from the ovary in the abdominal cavity, the contents of the ovarian tumor are aspirated, allowing the collapsed ovarian tumor to be detached and removed from the body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-313513 [Patent Document 2] Japanese Patent Application Publication No. 9-192214 [Patent Document 3] Japanese Patent Application Laid-Open No. 2000-000245 [Patent Document 4] Japanese Patent Application Laid-Open No. 2000-354624 Summary of the Invention [Problem to be solved by the invention]

[0005] However, for example, some ovarian cysts contain fat or highly viscous fluids, while peritonitis can result in highly viscous pus, and intraperitoneal hemorrhage can result in large amounts of semi-coagulated blood over a wide area. In these cases, conventional methods of aspirating and removing the fluid using a suction cannula can result in extremely slow suction speeds due to the viscosity of the fluid, blockage of the suction tube circuit during the suction removal procedure, requiring multiple instrument changes, enlarging the surgical incision, or incomplete fluid recovery, all of which increase surgical time and hinder efficiency. Similarly, in surgeries for peritonitis, intraperitoneal hemorrhage, and other conditions, the suction removal process can take up a significant portion of the surgical time.

[0006] The present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a medical suction device that can efficiently suction and remove highly viscous fluids retained in the body in a short period of time during laparoscopic or laparoscopic-assisted surgery. [Means for solving the problem]

[0007] In order to achieve the above object, a medical suction device according to one aspect of the present disclosure is a medical suction device for suctioning and recovering accumulated fluid in a body, and includes: a suction tube having an opening near a tip and a base end configured to be connectable to a suction apparatus, at least the tip being inserted into the body; and a liquid delivery tube having a nozzle at its tip and a base end configured to be connectable to a solution delivery device, the tip extending to the opening of the suction tube, wherein the suction tube has a accumulated liquid drawing section near its tip that draws the accumulated fluid in the body from the opening into the tube by the solution ejected from the nozzle of the liquid delivery tube, and a mixing section that mixes the accumulated liquid drawn into the tube with the ejected solution to form an emulsion in which the accumulated liquid is dispersed in the solution and transports the formed emulsion toward the base end of the suction tube. The stored liquid intake section is located in front of the tip of the liquid delivery tube disposed on the circumferential surface, and includes a notch portion formed by cutting a predetermined length or more in the radial direction from the circumferential surface of the suction tube into the opening edge of the circumferential surface of the suction tube, allowing the stored liquid in the body to enter, and a slope formed on the base end side of the notch portion, which is smoothly inclined to the circumferential surface of the suction tube, and which constitutes a positional relationship in which the solution ejected from the nozzle of the liquid delivery tube disposed on the circumferential surface collides with the stored liquid that has entered the notch portion. It is characterized by: [Effects of the Invention]

[0008] According to one aspect of the present disclosure, a medical suction device can be realized that has a simple and inexpensive configuration and can efficiently suction and remove highly viscous fluids retained in the body in a short period of time during laparoscopic or laparoscopic-assisted surgery. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a schematic diagram illustrating a state in which a suction system 100 including a medical suction device 1 according to an embodiment is used during surgery. [Figure 2] 1(a) is a plan view of the medical suction device 1, and FIG. 1(b) is a right side view. [Figure 3] 1(a) is a plan view of the tip portion of the medical suction device 1, (b) is a right-side cross-sectional view of the tip portion, and (c) is a front view. [Figure 4] 1 is a side cross-sectional view of the distal end portion for explaining the action and function of the medical suction device 1. FIG. [Figure 5] 1(a) is a photograph of Example 2 of the medical suction device 1 taken from the oblique front, and FIG. 1(b) is a photograph of the suction device and the liquid delivery device used in Example 2 of the medical suction device 1. FIG. [Figure 6] 1A is a plan view of a first embodiment of a medical suction device 1, and FIG. 1B is a left side view thereof. [Figure 7] 1(a) is a plan view of a medical suction device 1 according to a second embodiment, and FIG. 1(b) is a left side view thereof. [Figure 8] FIG. 2(a) is a left side view of a comparative example of a medical suction device, and FIG. 2(b) is a plan view. [Figure 9] 1(a) to 1(e) are schematic diagrams showing a surgical method using a conventional medical suction device. DETAILED DESCRIPTION OF THE INVENTION

[0010] <<How the present invention was developed>> Some ovarian cysts contain fat or highly viscous fluid, while peritonitis can result in highly viscous pus, and intraperitoneal bleeding can result in large amounts of semi-coagulated blood over a wide area. As such, there are many diseases that cause fluid accumulation in the lesion or surgical field, and surgery requires the removal of the accumulated fluid by suction.

[0011] For example, among tumors that occur in the ovaries, cysts filled with content are called ovarian cysts. The content can vary widely, including bloody, serous, and fluid-filled. In cases with a large amount of content, the size of an ovarian tumor can reach the size of a newborn's head. Because ovarian cysts can also cause acute abdominal pain, they are often removed surgically. In these cases, laparoscopic or laparoscopic-assisted surgery may be chosen, taking into consideration the patient's cosmetic and aesthetic needs.

[0012] Figures 9(a)-(e) are schematic diagrams illustrating a surgical procedure using a conventional medical suction device. As shown in Figure 9(a), ovarian cysts are swellings caused by the accumulation of various fluids inside the ovary. Laparoscopic surgery is performed using a trocar inserted into the abdominal wall (Figure 9(b)). In laparoscopic surgery, a suction cannula is inserted into the ovarian cyst (Figure 9(b)), connected to an external suction device such as a negative pressure tank via a suction tube circuit, such as a polyvinyl chloride tube, to aspirate the fluid (Figure 9(c)), collapse the tumor (Figure 9(d)), and then dissect and remove the cyst from the normal ovarian tissue (Figure 9(e)). Suctioning and removing the fluid from the ovary is medically important because it reduces tension on the ovary and facilitates its removal from the body.

[0013] The viscosity of ovarian contents presents a problem. For example, in tumors containing highly viscous internal substances, such as chocolate cysts, fluid-filled cysts, and teratomas, removal of these contents can be difficult using existing devices. Even with large-diameter medical suction devices, suction requires time. In particular, in enucleation of large ovarian cysts, the suction removal process can take up a significant portion of the surgical time and become a time-limiting step in the entire procedure. Furthermore, due to the difficulty of suction removal, laparoscopic-assisted surgery may be selected over fully laparoscopic surgery, resulting in an enlarged surgical incision.

[0014] In particular, when the contents of the cyst are highly viscous liquid or fatty, it can be difficult to aspirate the contents. For example, when using a liquid that contains a lot of fat and easily solidifies into a semi-solid at temperatures lower than body temperature, it can cause blockage of the suction circuit.

[0015] In addition, in the case of fluid-filled cysts, the viscous resistance of the contents can become greater than the suction pressure, making removal difficult. Also, the animal fat contained in fatty cysts, such as teratocarcinomas, hardens when cooled, making removal even more difficult.

[0016] Furthermore, a drop in the intraperitoneal temperature due to laparoscopic pneumoperitoneum and cooling of the suction circuit can cause the cyst contents to coagulate. In this way, when the ovarian fluid behaves like a solid, it can be necessary to extend the surgical time and enlarge the surgical wound.

[0017] In this way, in the conventional method of using a suction cannula to suction and remove accumulated liquid, the suction speed was extremely slow due to the viscosity of the accumulated liquid, and the suction tube circuit could become blocked during the suction removal operation, resulting in multiple instrument changes, enlarging the surgical incision, or in incomplete liquid collection, which increased the surgery time and hindered efficiency.

[0018] Therefore, the inventors realized that in laparoscopic or laparoscopic-assisted surgery, if it were possible to make the accumulated liquid in a state where it could not coagulate inside the suction circuit, in order to collect highly viscous accumulated liquid from the body and efficiently suction and remove it in a short time while maintaining the suction pressure at a pressure that is adaptively set for the patient, the accumulated liquid would be able to be aspirated smoothly.They conducted extensive research into methods to achieve this state, and arrived at the following embodiment.

[0019] <<Outline of the mode for carrying out the present invention>> A medical suction device according to an embodiment of the present disclosure is a medical suction device for aspirating and recovering accumulated fluid in the body, comprising: a suction tube having an opening near its tip and a base end configured to be connectable to a suction apparatus, at least the tip of which is inserted into the body; and a fluid delivery tube having a nozzle at its tip and a base end configured to be connectable to a solution delivery device, the tip of which extends to the opening of the suction tube, wherein the suction tube has a retained fluid drawing section near its tip that draws the retained fluid in the body from the opening into the tube using the solution ejected from the nozzle of the fluid delivery tube, and a mixing section that mixes the retained fluid drawn into the tube with the ejected solution to form an emulsion in which the retained fluid is dispersed in the solution, and transports the formed emulsion toward the base end of the suction tube.

[0020] With this configuration, a simple and inexpensive configuration achieved by the shape of the tip makes it possible to realize a medical suction device that can efficiently suction and remove highly viscous fluids retained in the body in a short period of time during laparoscopic or laparoscopic-assisted surgery.

[0021] In another aspect, in any of the above aspects, the stored liquid intake portion may be located forward of the tip of the liquid delivery tube provided on the circumferential surface, and the opening edge provided on the circumferential surface of the suction tube may be cut radially from the circumferential surface by a predetermined length or more, forming a notch through which stored liquid from within the body can enter, and a slope formed on the base end side of the notch and smoothly sloping to the circumferential surface of the suction tube, constituting a positional relationship in which the solution ejected from the nozzle of the provided liquid delivery tube collides with the stored liquid that has entered the notch.

[0022] With this configuration, the medical suction device can draw accumulated liquid from the body into the tube through the opening by using the solution ejected from the nozzle of the liquid delivery tube near the tip, thanks to the notch in the suction tube and the accumulated liquid intake section including the slope.

[0023] In another aspect, in any of the above aspects, the stored liquid that has entered the cutout portion may be further drawn into the tube by a Venturi effect based on the flow of the solution ejected from the tip of the liquid delivery tube.

[0024] With this configuration, a cycle can be created in which new stored liquid is drawn into the tube from the notch due to the negative pressure generated in the gap of the stored liquid that has been transported toward the curved end along with the solution, due to the Venturi effect, and stored liquid in the body can be more effectively drawn into the tube from the opening.

[0025] In another aspect, in any of the above aspects, the liquid delivery tube may be arranged on the circumferential surface of the suction tube and on the slope, and the area from the tip to the slope may be inclined toward the inside of the suction tube.

[0026] With this configuration, a recess is formed between the outer periphery near the tip of the suction tube and the tip side of the slope, and the accumulated liquid that has entered this recess is scraped off by the action of the surgeon moving the suction device, and the scraped off accumulated liquid is drawn into the inside of the suction tube, combined with the Venturi effect of the water supply.

[0027] In another aspect, in any of the above aspects, the mixing section may be located at the tip of the suction tube, bulge in a hemispherical convex shape toward the tip of the suction tube to close the tube, and include a curved end portion that is positioned so as to intersect with an extension of the tube axis of the liquid delivery tube.

[0028] With this configuration, the stored liquid and solution transported in the direction of the curved end form a vortex along the curved surface of the curved end, promoting emulsification during suction, and the transport direction of the stored liquid and solution can be changed toward the base end of the suction tube.

[0029] Furthermore, in another aspect, in any of the above aspects, the stored liquid drawn into the tube and the injected solution may form a vortex along the curved surface of the curved end portion to form the emulsion, and the transport direction of the formed emulsion may be changed toward the base end of the suction tube.

[0030] With this configuration, the injected solution and the stored liquid drawn into the tube by the vortex flow are cut, and the stored liquid cut by the vortex flow is mixed with the injected solution to form an emulsion in which the stored liquid is dispersed in the solution, and at the same time, the formed emulsion can be transported as a drainage flow toward the base end of the suction tube by the vortex flow.

[0031] In another aspect, in any of the above aspects, the negative pressure applied by the suction device to the base end of the suction tube may be configured to have an absolute value greater than the positive pressure at which the liquid delivery device delivers the solution.

[0032] With this configuration, the solution containing the cut stored liquid can be transported toward the base end of the suction tube after colliding with the curved end. At this time, the solution is transported by the water supply pressure without overflowing outside the solution supply tube, and the transport toward the base end of the suction tube is accelerated by the suction pressure.

[0033] In another aspect, any of the above aspects may further be configured to include a switch that can be operated by the surgeon and that can independently switch between suction / stop by the suction device and liquid delivery / stop by the liquid delivery device.

[0034] Conventionally, the switches that control the application and release of suction pressure by the suction device and the start and stop of fluid delivery by the fluid delivery device are located outside the operating room, and the surgeon must give instructions from outside the operating room to start / stop suction by the suction device and deliver / stop fluid by the fluid delivery device, making the process complicated.

[0035] In contrast, with this configuration, the surgeon can independently operate the suction device to start or stop suction and the liquid delivery device to start or stop liquid delivery, facilitating quick operation and enabling instantaneous switching of operations.

[0036] Furthermore, by being able to independently switch between suction / stop by the suction device and fluid delivery / stop by the fluid delivery device, if the suction tube becomes blocked, it is possible to immediately stop the fluid delivery alone, thereby preventing the solution from overflowing from the opening into the surgical field due to water delivery after the blockage.

[0037] In another aspect, in any of the above aspects, the fluid stored in the body may be the fluid contained in an ovarian cyst.

[0038] This configuration can prevent the suction removal process from taking up a large amount of surgical time during ovarian cyst enucleation and becoming one of the time-limiting steps in the entire surgery. It also prevents the surgical wound from widening due to the difficulty of suction removal, which would otherwise require laparoscopic-assisted surgery instead of fully laparoscopic surgery.

[0039] In another aspect, in any of the above aspects, there is provided a medical suction device for suctioning and recovering accumulated fluid in a body, the medical suction device comprising: a suction tube having an opening near a tip and a base end connectable to a suction apparatus, at least the tip of which is inserted into a body; and a liquid delivery tube having a nozzle at a tip and a base end connectable to a liquid delivery device for a solution, the tip of which extends to the opening of the suction tube, the suction tube being located forward of the tip of the liquid delivery tube provided on a peripheral surface, and the edge of the opening opened on the peripheral surface of the suction tube being in contact with the peripheral surface. a slope formed on the base end side of the suction tube relative to the cutout, smoothly sloping up to the circumferential surface of the suction tube, so that the solution ejected from the tip of the liquid delivery tube located above collides with the stored liquid that has entered the cutout; and a curved end portion located at the tip of the suction tube, bulging in a hemispherical convex shape toward the tip of the suction tube to close the tube, and positioned so as to intersect with an extension of the axis of the liquid delivery tube.

[0040] With this configuration, a medical suction device can be realized that can efficiently suction and remove highly viscous fluids retained in the body in a short time during laparoscopic or laparoscopic-assisted surgery.

[0041] <Embodiment> A medical suction device 1 according to this embodiment will be described with reference to the drawings. Note that the drawings are schematic diagrams, and the scale may differ from the actual scale. Furthermore, the following description is an example for explaining the configuration, actions, and effects of one embodiment of the present disclosure, and the essential parts of the present disclosure are not limited to the following embodiment. Furthermore, including the following description, up and down in this specification and claims indicate relative positional relationships, with the upper direction on the paper in the drawings being the "up" direction and the lower direction on the paper being the "down" direction. However, this does not necessarily correspond to an absolute (vertical) positional relationship of up and down. Furthermore, in this specification and claims, the symbol "~" used to indicate a numerical range includes the numerical values ​​at both ends.

[0042] <Overall configuration of the suction system 100 including the medical suction device 1> The medical suction device 1 (hereinafter referred to as the "suction device") is a medical instrument used by doctors and other medical personnel to suction and remove accumulated fluids in the surgical area or surgical field during laparoscopic or laparoscopic-assisted surgery.It is designed to make it easier and more efficient to suction and remove highly viscous accumulated fluids in the body, from the perspective of reducing the burden on patients and doctors and improving the efficiency of surgery during surgery.

[0043] 1 is a schematic diagram illustrating an example of an suction system 100 including an suction device 1 according to an embodiment in use during surgery. This diagram illustrates an example of using the suction device 1 to suction and collect internal fluid from an ovarian cyst as internal fluid.

[0044] As shown in FIG. 1, the suction system 100 includes a suction device 1, a trocar 10, a liquid delivery device 40, a liquid delivery tube 41, a suction device 50, and a suction tube 51, and these components are connected to form the suction system 100, which has a liquid delivery channel and a drainage channel.

[0045] The trocar 10 is a guide means for facilitating access to the surgical site for treatment tools including the suction device 1 during laparoscopic or laparoscopic-assisted surgery by inserting its tip into the abdominal wall to secure a conduit to the surgical site. In this example, the trocar 10 is inserted into the ovarian cyst through the abdominal wall and functions as a guide means for suctioning and recovering the internal fluid of the ovarian cyst.

[0046] The suction device 1 is a medical instrument that is inserted into a surgical site to suck and remove accumulated fluid from the body. As shown in Fig. 1, the suction device 1 has a two-channel structure that includes a suction pipe 20 connected to a suction apparatus 50 via a suction tube 51, and a liquid delivery pipe 30 connected to a liquid delivery apparatus 40 via a liquid delivery tube 41. The two may be arranged side by side and integrally molded.

[0047] The fluid delivery device 40 is connected to the suction device 1 and is a fluid delivery means for emulsifying fluids accumulated in the body by supplying a solution to the surgical site. The fluid delivery device 40 may be configured, for example, as a fluid delivery facility outside the operating room or a portable pressurized bag. For example, it may be configured to release physiological saline pressurized to about 300 mHg in a pressurized bag as a thin jet stream inside the suction tube.

[0048] The liquid supply tube 41 is made of a vinyl chloride tube or the like and connects the suction device 1 and the liquid supply device 40 to form a liquid supply tube circuit.

[0049] The suction unit 50 is a suction means connected to the suction device 1 for applying negative pressure to the surgical site to suck and remove accumulated fluid from the body. The suction unit 50 may be configured, for example, from a negative pressure tank (operating room suction unit: for example, -0.04 to -0.07 MPa) outside the operating room.

[0050] Furthermore, the negative pressure applied to the base end 22 of the suction tube 20 by the suction device 50 is configured to have a larger absolute value than the positive pressure at which the solution is delivered by the liquid delivery device 40. For example, when the negative pressure of the operating room suction device is set to about -0.04 to about -0.05 Pa, the positive pressure of the liquid delivery device may be set to a maximum of about +0.04 MPa.

[0051] The suction tube 51 is made of a polyvinyl chloride tube, resin, metal, or the like, and connects the suction device 1 and the suction apparatus 50 to form a suction tube circuit.

[0052] <Components of the suction device 1> Next, we will explain the configuration of each part of the suction device 1. Figure 2(a) is a plan view of the medical suction device 1, (b) is a right side view. Figure 3(a) is a plan view of the tip of the medical suction device 1, (b) is a right cross-sectional view of the tip, and (c) is a front view.

[0053] 2(a) and 2(b), the suction device 1 has a two-channel structure including a suction pipe 20 connected to a suction tube 51 and a liquid delivery pipe 30 connected to a liquid delivery tube 41. In this example, the liquid delivery pipe 30 is disposed above the circumferential surface of the suction pipe 20.

[0054] (Suction tube 20) The suction tube 20 is a tubular member made of a resin material. At least the distal end 23 is inserted into the body via the trocar 10. An opening 25 is formed near the distal end 23 of the long tubular portion 21, and the proximal end 22 is configured to be connectable to a suction tube 51. The size of the opening 25 may be selected, for example, from a range of 5 mm to 12 mm in diameter based on the type and size of the surgical site and the volume of the retained fluid. In this example, the suction tube 20 is inserted into an ovarian cyst and functions as a tube for suctioning and collecting the internal fluid of the ovarian cyst.

[0055] The suction tube 20 also has a notch 211a cut into the edge of the opening 25 on its peripheral surface in the radial direction by a predetermined length δ or more, and a slope 211b formed on the base end 22 side of the notch 211a that smoothly slopes down to the peripheral surface. The slope 211b forms an inclined surface that slopes inward toward the tip 23 of the suction tube 20 at an angle θ (hereinafter, sometimes referred to as "inclination angle θ") with respect to the axis of the suction tube 20. The notch 211a and slope 211b of the suction tube 20 function as the retained liquid intake section 211.

[0056] The suction tube also has a mixing section 212 located at the tip 23 thereof, which includes a curved end 27 that bulges out in a semispherical convex shape toward the tip 23 to seal the tube. The curved end 27 is positioned so as to intersect with the axis 30c1 of the liquid delivery tube 30 near its tip.

[0057] The details and functions of the stored liquid drawing section 211, which is composed of the notch section 211a and the slope 211b, and the mixing section 212 will be described later.

[0058] A branch pipe connecting portion 29 and a handle portion for the operator (not shown) may be provided near the base end 22 of the pipe portion 21.

[0059] The suction tube 20 can be made of a resin material such as polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polyamide, polyimide, or polyacetal.

[0060] The outer diameter of the tube portion 21 is selected, for example, from a range of 3 mm to 16 mm, more preferably 5 mm to 12 mm, based on the type and size of the surgical site and the volume of the retained fluid. The length may be selected from a range of 50 mm to 400 mm, more preferably 150 mm to 320 mm. However, it goes without saying that the tube diameter and material are not limited to the above dimensions and materials. In this example, the outer diameter of the tube portion 21 is 5 mm or 12 mm, and the inner diameter is 3 mm or 10 mm.

[0061] (liquid supply pipe 30) The fluid delivery tube 30 is a tubular member made of a resin material that is provided on the circumferential surface of the tubular portion 21 of the suction tube 20 and whose tip extends to the vicinity of the base end 32 side of the opening 25 of the suction tube 20. At least the tip 33 is inserted into the body together with the suction tube 20 via the trocar 10. A predetermined length from the hole at the tip 33 of the long tubular portion 31 functions as a nozzle 34, and the base end 32 is configured to be connectable to a fluid delivery tube 41. In this example, the fluid delivery tube 30 is inserted into the ovarian cyst together with the suction tube 20, and functions as a tube that supplies a solution for suctioning and recovering internal fluid from the ovarian cyst.

[0062] In addition, the nozzle 34 of the liquid delivery tube 30 is installed above the slope 211b of the suction tube 20, and the area from the tip 33 to the slope 211b is inclined toward the inside of the suction tube 20 by an angle θ with respect to the axis of the suction tube 20.

[0063] The liquid delivery tube 30 can be made of the same resin material as the suction tube 20. The outer diameter of the tube portion 31 is selected, for example, from a range of 0.3 mm to 2.0 mm, more preferably 0.5 mm to 1.5 mm, based on the type and size of the surgical site and the volume of the stored liquid. The length may be shorter than that of the suction tube 20, for example, selected from a range of 120 mm to 300 mm. However, it goes without saying that the tube diameter and material are not limited to the above dimensions and materials.

[0064] <Operation of suction device 1> (Function of the stored liquid intake unit 211) Next, we will explain the operation of the suction device 1. Figure 4 is a side cross-sectional view of the distal end portion for explaining the action and function of the medical suction device 1.

[0065] As described above, the cutout portion 211a of the suction tube 20 is configured such that the edge of the opening 25 formed on the peripheral surface is cut radially from the peripheral surface by a predetermined length δ or more, and a slope 211b is formed on the base end 22 side of the cutout portion 211a and is inclined smoothly to the peripheral surface by an angle θ with respect to the tube axis.

[0066] The depth of the cutout portion 211a is configured to be a predetermined length δ or more in the radial direction from the circumferential surface (hereinafter, sometimes referred to as "depth δ"), which is relatively large compared to the tube diameter, as will be described later, and a slope 211b is provided on the base end 22 side, so that the stored liquid COL in the body can enter near the bottom of the cutout portion 211a, and the stored liquid COL can enter the tube from the circumferential surface of the suction tube 20 to a depth δ.

[0067] Here, the depth δ of the notch 211a may be, for example, 2 mm or more and 5 mm or less, or may be in the range of 10% to 50% of the pipe diameter, more preferably 20% to 30%.

[0068] In addition, the nozzle 34 of the liquid delivery tube 30 is provided above the slope 211b formed on the base end 22 side of the cutout portion 211a, so that the spray of the solution SFL ejected from the nozzle 34 can be caused to collide with the stored liquid COL that has entered the cutout portion.

[0069] As described above, the slope 211b forms an inclined surface inclined at an angle θ with respect to the axis of the suction tube 20 toward the inside of the tip 23, and the nozzle 34 of the liquid delivery tube 30 provided on the slope 211b is also inclined at an angle θ with respect to the axis of the suction tube 20 toward the inside of the suction tube 20. As a result, as described above, the axis 30cl of the nozzle 34 is positioned so as to intersect with the curved end 27 of the suction tube 20. Furthermore, as shown in Figure 4, the axis 30cl of the nozzle 34 may intersect with the axis 23cl of the curved end 27 of the suction tube 20 at the intersection X0 of the curved end 27.

[0070] Here, the inclination angle θ of the slope 211b may be, for example, 12 degrees or more and 15 degrees or less, and the length of the slope may be, for example, 5 mm or more and 30 mm or less.

[0071] As a result, the stored liquid COL that has entered the cutout portion is subjected to a force in the direction of the curved end portion 27 of the suction tube 20 by the solution ejected from the nozzle 34 by the liquid feed flow SFL, and the stored liquid COL is transported together with the solution in the direction of the curved end portion 27, and new stored liquid COL is drawn into the tube from the cutout portion due to the negative pressure generated in the gap, thereby forming a cycle based on the Venturi effect.

[0072] As described above, the notch 211a and slope 211b of the suction tube 20 function as a liquid intake portion 211 near the tip, which draws the liquid COL stored in the body into the tube from the opening 25 using the solution ejected from the nozzle 34 of the liquid delivery tube 30.

[0073] (Functions of the mixer 212) As described above, the curved end 27 of the suction tube has a curved shape that bulges out in a hemispherical convex shape at the tip 23 to seal the tube. As a result, the stored liquid COL and the solution being transferred in the direction of the curved end 27 form a vortex flow EFL along the curve of the curved end 27, and the transfer direction of the stored liquid COL and the solution is changed toward the base end 22 of the suction tube 20.

[0074] At this time, the ejected solution and the retained liquid COL drawn into the tube by the vortex flow EFL are cut, and the cut retained liquid COL is further mixed with the ejected solution, forming an emulsion in which the retained liquid COL is dispersed in the solution, i.e., an emulsion with the retained liquid COL as the dispersoid and the solution as the dispersion medium. At the same time, the formed emulsion is transported by the vortex flow EFL as a drainage flow EFL toward the base end 22 of the suction tube 20.

[0075] That is, the curved end 27, which is positioned so as to intersect with the axis 30cl of the tip of the liquid delivery tube 30, generates a vortex flow EFL, thereby functioning as a mixing section 212 that forms an emulsion in which the stored liquid COL is dispersed in a solution and transports the emulsion toward the base end 22 of the suction tube 20.

[0076] In the mixing section 212, the solution containing the cut stored liquid COL rotates in a vortex, and after colliding with the curved end 27, it is transferred in the direction of the base end 22 of the suction tube 20 while maintaining this rotation. This rotational motion prevents the liquid flow SFL from overflowing outside the liquid feed tube 30, and the liquid is fed by the water feed pressure. Furthermore, applying suction pressure has the effect of accelerating this rotational motion.

[0077] In this way, if the accumulated liquid can be made non-coagulable inside the suction circuit by emulsifying it during suction, the accumulated liquid can be aspirated without stagnation.

[0078] <Evaluation test> Performance evaluation was carried out by evaluation tests using examples and comparative examples of the medical suction device 1 according to the embodiment. The results are described below.

[0079] (Examples 1 and 2) As an example of suction device 1, a full-scale, usable prototype of a suction cannula was created using a 3D printer and evaluated. Specifically, a suction cannula with a two-channel structure (water supply and suction) was created, with water circulating at high pressure and speed at the tip, and the tip was shaped like a sharp spoon with a side hole.

[0080] In laparoscopic surgery, a cylindrical device called a trocar is inserted into the abdominal wall, and its lumen is used as an access port to move instruments in and out of the abdominal cavity. The lumen standard is 5mm or 12mm, and most laparoscopic surgical instruments are made with this diameter.

[0081] Therefore, in accordance with this standard, prototypes of the suction device 1 with outer diameters of 5 mm and 12 mm were produced as Examples 1 and 2, respectively.

[0082] 5(a) is a plan view of Example 1 of the suction device 1, and (b) is a left side view, in which Example 1 of the suction device 1 has a configuration in which a liquid supply pipe 301 is provided on the periphery of a 5 mm suction tube 201 having an opening 251 opened near the tip 231. Fig. 6(a) is a plan view of Example 2 of the suction device 1, and (b) is a left side view, in which Example 2 of the suction device 1 has a configuration in which a liquid supply pipe 302 is provided on the periphery of a 12 mm suction tube 202 having an opening 252 opened near the tip 232.

[0083] 7(a) is a photograph of Example 2 of the medical suction device 1 taken from the oblique front, and FIG. 7(b) is a photograph of the suction device and the liquid delivery device used in Example 2 of the medical suction device 1. In FIG.

[0084] Examples 1 and 2 were created using a stereolithography 3D printer. Photocoagulation resin was used as the material. They were cylindrical, with the tip having a curved, outwardly convex shape like a test tube. An opening with a diameter of 6 mm and a diameter of 4.5 mm was opened on the side of the tip in Examples 2 and 1 (outer diameters 12 mm and 5 mm), respectively. Furthermore, from the opening toward the base end, the tip sloped downward at an angle of 12 to 15 degrees relative to the tube axis. The length of the slope was 20 mm and 8 mm in Examples 2 and 1 (outer diameters 12 mm and 5 mm), respectively.

[0085] The operation procedures of the second and first embodiments will be described.

[0086] [Liquid delivery pipe, nozzle] The liquid delivery tubes in Examples 2 and 1 (outer diameters of 12 mm and 5 mm) were formed as slits with diameters of 1.5 mm and 0.5 mm, respectively. A syringe needle with its tip narrowed and crushed was placed in this slit to form a nozzle. The nozzle was bent along the slope described above, allowing water to come out as a solution from the edge of the opening.

[0087] When pressurized water is connected to this nozzle, the water is emitted as a thin jet from the edge of the opening and strikes the center of the curved, hemispherical end.

[0088] [Suction tube, cutout] Depending on the angle of the slope, a height difference of 1 to 2 mm occurs between the outer periphery near the tip of the suction tube and the tip of the slope, forming a recess. Any accumulated fluid that enters this recess is scraped away by the surgeon's movement while moving the suction device. The scraped-away accumulated fluid is drawn into the inside of the suction tube, combined with the Venturi effect of the water supply.

[0089] [Suction tube, curved end] The liquid drawn into the suction tube is mixed with the jet of water and is positioned to collide with the center of the hemispherical curved end, which has an inner surface that is transported toward the suction tube along the lumen of the hemispherical curved end.

[0090] [Suction tube] The inner lumen of the suction tube was 8 mm and 3 mm in Examples 2 and 1 (outer diameters 12 mm and 5 mm), respectively. The transition section from the tip to the suction channel in Example 1 (outer diameter 5 mm) had a tapered structure that narrowed toward the tip.

[0091] (Comparative Example) A comparative example of a medical suction device was used to evaluate its performance through an evaluation test. Figure 8(a) is a left side view of the comparative example of a medical suction device, and (b) is a plan view. As shown in Figures 8(a) and 8(b), the comparative example of a suction device has a configuration in which a liquid supply tube 30x is attached to the periphery of a 12 mm suction tube 20x with an opening 25x near the tip 23x. However, the comparative example differs from Examples 1 and 2 in that it does not have a slope. The structure of the comparative example was 3D modeled and printed to create a sample. Evaluation Test 1 was performed using a mixture of cottage cheese and lard, as in the examples.

[0092] (Test results) [Evaluation Test 1] First, a mixture of cheese and lard was prepared as a teratoma model, and used as a model (teratoma model) of the contents of an ovarian tumor (ovarian mature cystic teratoma), and evaluation test 1 was performed.

[0093] We used a pump-type pressure bag (a device that uses pressurized air to pressurize a saline drip bag and delivers water to the surgical field using a soft tube) used in actual laparoscopic surgery, and a vacuum pump set to the same pressure (-0.04 to -0.05 MPa) as the operating room suction device.

[0094] The physiological saline solution in the pressure bag at room temperature (18°C) was pressurized to 0.04 MPa, and the bag was connected to the water supply channel of the suction device of Examples 1 and 2 using a soft tube.

[0095] On the suction side, the vacuum pump, suction bottle, and suction tube of the suction device were connected in this order.

[0096] An experiment was conducted to investigate whether an efficient suction operation was possible by preparing a glass cup containing a teratoma model and inserting the suction devices of Examples 1 and 2 in operation into the cup.

[0097] In Examples 1 and 2, the water impinged on the center of the tip lumen as designed and proceeded toward the suction path without leaking out of the opening. When the vacuum pump was operated in this state, the speed at which the water returned to the suction side accelerated. Next, when the device was placed in contact with a teratoma model in this state, the area scraped by the slope of the device was drawn into the lumen and sucked into the suction bottle by the soft tube. At this time, the water remained emulsified with water in the suction bottle and did not solidify and block the middle of the soft tube.

[0098] (Comparative Example) On the other hand, in the comparative example, which differs from Examples 1 and 2 in that it does not have a slope, much of the pressurized water leaked out of the device from the flow path, and the expected effect could not be obtained.

[0099] [Evaluation Test 2] Next, experiments were conducted using actual clinical specimens (contents of ovarian tumors). After obtaining prior consent from the patients, the same procedures as in the model experiments were performed using the contents of ovarian teratomas that were scheduled to be discarded. The contents of actual teratomas appeared to coagulate more easily at higher temperatures than the model, and were solidified at room temperature (18°C) where the experiments were conducted. In experiments using existing laparoscopic suction forceps and a medical suction device used in open surgery, blockages in the suction tube and suction circuit occurred in both cases.

[0100] In contrast, according to Examples 1 and 2, it was possible to aspirate the coagulated ovarian tumor contents by moving the device back and forth using the slope-shaped portion and by the effect of water supply. Thus, according to Examples 1 and 2, an inexpensive and simple device was able to perform operations that were difficult with conventional suction devices.

[0101] (Consideration) From the above results, the following can be inferred.

[0102] In Examples 1 and 2, the nozzle of the liquid supply pipe was configured as described above, and a slope was adopted toward the opening, making it possible to achieve the direction of the water flow.

[0103] In Examples 1 and 2, the shape of the cutout portion of the suction tube was configured as described above, and a cutout portion having a recessed shape with an opening and a slope was adopted, making it possible to scrape off the semi-solid stored liquid and draw in the stored liquid.

[0104] In Examples 1 and 2, by configuring the shape of the curved end of the suction tube as described above, the stored liquid drawn into the inside of the suction tube is mixed with the jet of water sent in, collides with the center of the hemispherical curved end, and is transported toward the suction tube along the inner cavity of the hemispherical curved end.

[0105] In Example 1, which has an outer diameter of 5 mm and is relatively prone to clogging, the suction tube has a tapered structure that narrows toward the tip, which allows clogging to occur only at the tip of the device, making it easy to release the clogging by stopping suction.In addition, no clogging was observed in either Example 1 or Example 2 in the experiment.

[0106] (effect) The following effects were confirmed through evaluation tests 1 and 2.

[0107] In model experiments using substances with higher viscosity and semi-solid state than those encountered during actual surgery, such as lard and cottage cheese, the new suction tube was able to aspirate the contents more efficiently than conventional suction tubes, without causing blockage of the circuit midway.

[0108] Using the surgically excised specimens, we conducted an experiment to aspirate the contents of ovarian cysts, which are primarily composed of sebum, which is the most difficult substance to aspirate in actual surgery, and obtained similar results.

[0109] From the above results, 1) to 4) were confirmed.

[0110] 1) The sharp spoon at the tip, under negative pressure, made it possible to scrape and suck viscous and semi-solid liquids into the suction tube.

[0111] 2) By supplying pressurized water to the tip, it became possible to crush and emulsify the viscous, semi-solid liquid that was scraped into the tip.

[0112] 3) It became possible to simultaneously aspirate and remove emulsified viscous and semi-solid liquids from the tip.

[0113] 4) Because the viscous, semi-solid liquid that is sucked in is emulsified, it passes through conventional polyvinyl chloride tubing without clogging, and it has been confirmed that it is sucked in and drained into an external tank.

[0114] <Summary> As described above, the medical suction device 1 according to the embodiment is a medical suction device 1 for aspirating and collecting accumulated fluid in the body, and is equipped with a suction tube 20 having an opening 25 near the tip 23 and a base end 22 configured to be connectable to a suction device 50, with at least the tip 23 being inserted into the body, and a liquid delivery tube 30 having a nozzle 34 at the tip 33 and a base end 32 configured to be connectable to a solution delivery device 40, with the tip 33 extending to the opening 25 of the suction tube 20, and is characterized in that the suction tube 20 has a accumulated liquid drawing section 211 near the tip 23 that draws the accumulated fluid in the body from the opening 25 into the tube 20 using a solution ejected from the nozzle 34 of the liquid delivery tube 30, and a mixing section 212 that mixes the accumulated fluid drawn into the tube 20 with the ejected solution to form an emulsion in which the accumulated fluid is dispersed in the solution, and transports the formed emulsion toward the base end 22 of the suction tube 20.

[0115] With this configuration, the medical suction device 1 can be realized as a suction device that efficiently suctions and removes highly viscous fluids retained in the body in a short time during laparoscopic or laparoscopic-assisted surgery, with a simple and inexpensive configuration that can be realized only by the tip shape, without including any operating section, etc. This makes it possible to realize a disposable surgical suction device.

[0116] In addition, the stored liquid intake section 211 may be configured to be located in front of the tip 23 of the liquid delivery tube 30 installed on the circumferential surface, and the edge of the opening 25 opened on the circumferential surface of the suction tube 20 is cut radially from the circumferential surface by a predetermined length δ or more, to include a cutout section 211a through which stored liquid from the body can enter, and a slope 211b formed on the base end 22 side of the cutout section 211a, which smoothly slopes down to the circumferential surface of the suction tube 10, and which constitutes a positional relationship in which the solution ejected from the nozzle 34 of the installed liquid delivery tube 30 collides with the stored liquid that has entered the cutout section 211a.

[0117] With this configuration, the stored liquid drawing-in portion 211 including the cutout portion 211a and slope 211b of the suction tube 20 allows the medical suction device 1 to draw the stored liquid COL in the body into the tube from the opening 25 near the tip by the solution ejected from the nozzle 34 of the liquid delivery tube 30.

[0118] In addition, the mixing section 212 may be configured to be located at the tip 23 of the suction tube 20, bulge in a hemispherical convex shape toward the tip of the suction tube 20 to close the tube, and include a curved end 27 that is positioned so as to intersect with the extension line of the tube axis cl of the liquid delivery tube 30.

[0119] With this configuration, in the medical suction device 1, the ejected solution and the retained liquid COL drawn into the tube by the vortex flow EFL are cut, and the cut retained liquid COL is further mixed with the ejected solution by the vortex flow EFL to form an emulsion in which the retained liquid COL is dispersed in the solution, and at the same time, the formed emulsion can be transported as a drainage flow EFL toward the base end 22 of the suction tube 20 by the vortex flow EFL.

[0120] <<Variations>> While the specific configuration of the present disclosure has been described above using the embodiments as examples, the present disclosure is not limited to the above embodiments except for the essential characteristic components thereof. For example, the present disclosure also includes forms obtained by various modifications to the embodiments and forms realized by arbitrarily combining the components and functions of each embodiment within the scope of the present invention.

[0121] Below, a modified example will be described as an example of such a configuration. (1) In the above embodiment, the suction device 1 is configured such that the suction tube 20 is connected to the suction device 50 via the suction tube 51, and the liquid delivery tube 30 is connected to the liquid delivery device 40 via the liquid delivery tube 41, and the medical suction device 1 does not have any switches to control the application and release of suction pressure or the start and stop of liquid delivery.

[0122] However, the suction device according to the modified example may be configured with a switch that can independently switch between suction and stop by the suction device and between fluid delivery and stop by the fluid delivery device and that can be operated by an operator. Here, the switch that can be operated by an operator may be a simple switch provided on the suction tube. Alternatively, another switch, such as a foot switch that can be operated by an operator, may be used.

[0123] Conventionally, the switches that control the application and release of suction pressure by the suction device 50 and the start and stop of fluid delivery by the fluid delivery device 40 are located outside the operating room, and the surgeon must give instructions from outside the operating room to start / stop suction by the suction device and deliver / stop fluid by the fluid delivery device, making the process complicated.

[0124] In contrast, in the suction device according to the modified example, the surgeon can independently control suction / stop by the suction device and fluid delivery / stop by the fluid delivery device, which facilitates quick operation when, for example, the suction tube is blocked, and enables instantaneous switching of operations.

[0125] Furthermore, by being able to independently switch between suction / stop by the suction device and fluid delivery / stop by the fluid delivery device, if the suction tube becomes blocked for some reason, it is possible to immediately stop the fluid delivery alone, thereby preventing the solution from overflowing from the opening into the surgical field due to water delivery after the blockage. (2) In the suction device 1 according to the above embodiment, the liquid supply tube 30 is configured to be disposed on the circumferential surface of the tube portion 21 of the suction tube 20. However, the liquid supply tube 30 may be configured to be disposed extending along the inner wall of the suction tube 20 as long as it is disposed in parallel with the suction tube 20 so that the trocar 10 can be inserted therethrough. Alternatively, the two may be disposed in parallel and integrally molded. (3) In the above embodiment, an ovarian cyst enucleation procedure is taken as an example of the suction device 1. However, the use of the suction device according to the present invention is not limited to ovarian cyst enucleation, and the device can be widely used in surgeries that require suction removal of fluid accumulated in the body due to fluid accumulation in the lesion or surgical field, such as ovarian cysts, peritonitis, and intraperitoneal bleeding.

[0126] <<Additional Information>> The embodiments described above each illustrate a preferred specific example of the present invention. The numerical values, shapes, materials, components, component placement and connection configurations, steps, and step sequences shown in the embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the embodiments, those not described in the independent claims that represent the highest concept of the present invention are described as optional components that constitute more preferred embodiments.

[0127] The order in which the above methods are performed is merely an example for specifically explaining the present invention, and other orders may be used. Also, some of the above methods may be performed simultaneously (in parallel) with other methods.

[0128] In order to facilitate understanding of the invention, the scale of the components in the drawings of the above embodiments may differ from the actual scale. Furthermore, the present invention is not limited to the description of the above embodiments, and can be modified as appropriate within the scope of the gist of the present invention.

[0129] Furthermore, at least some of the functions of the embodiments and their modifications may be combined. [Industrial Applicability]

[0130] A medical suction device according to one aspect of the present disclosure can be widely used as a means for suctioning and removing lesions or accumulated fluid in the surgical field during laparoscopic or laparoscopic-assisted surgery. [Explanation of symbols]

[0131] 1. Medical suction devices 10 Trocar 20, 201, 201, 20x suction tube 21 Pipe section 211 Retention fluid intake section 211a cutout Department 211b Slope 212 Mixing section 22 Proximal end 23, 231, 232, 23x Tip 25, 251, 252, 25x aperture 27 Curved end 28 branch pipe 29 Branch pipe connection 30, 301, 302, 30x liquid delivery tube 31 Pipe section 32 Proximal end 33 Tip 34 nozzles 40 Liquid delivery device 41 Liquid transfer tube 50 Suction device 51 Suction tube

Claims

1. A medical suction device for suctioning and collecting accumulated fluids in the body, a suction tube having an opening near a tip, a base end configured to be connectable to a suction device, and at least the tip being inserted into the body; a liquid delivery tube having a nozzle at a tip end, a base end configured to be connectable to a liquid delivery device for a solution, and a tip end extended to the opening of the suction tube; The suction tube is a liquid intake section in the vicinity of the tip, which draws the liquid in the body from the opening into the tube by the solution ejected from the nozzle of the liquid delivery tube; a mixing section that mixes the stored liquid drawn into the tube with the injected solution to form an emulsion in which the stored liquid is dispersed in the solution, and that transports the formed emulsion toward the base end of the suction tube; The stored liquid intake portion is a notch portion located in front of the tip of the liquid delivery tube provided on the peripheral surface, the notch portion being cut radially from the peripheral surface by a predetermined length or more at an opening edge opened on the peripheral surface of the suction tube, allowing the accumulated liquid in the body to enter; The notch portion includes a slope formed on the base end side thereof, which slopes smoothly up to the peripheral surface of the aspirating tube, and which constitutes a positional relationship in which the solution ejected from the nozzle of the liquid delivery tube disposed above collides with the stored liquid that has entered the notch portion. Medical suction devices.

2. The stored liquid that has entered the notch is further drawn into the tube by the Venturi effect based on the flow of the solution ejected from the tip of the liquid delivery tube. The medical suction device of claim 1 .

3. the liquid supply pipe is provided on the circumferential surface of the suction pipe and on the slope; The area from the tip to the slope is inclined toward the inside of the suction tube. The medical suction device according to claim 1 or 2.

4. The mixing section is located at the tip of the suction tube, bulges out in a semispherical convex shape toward the tip of the suction tube to close the tube, and includes a curved end portion that is in a positional relationship intersecting with an extension of the tube axis of the liquid delivery tube. The medical suction device according to any one of claims 1 to 3.

5. The stored liquid drawn into the tube and the ejected solution form a vortex along the curved surface of the curved end, thereby forming the emulsion, and the transfer direction of the formed emulsion is changed toward the base end of the suction tube. The medical suction device of claim 4.

6. A medical suction device for suctioning and collecting accumulated fluids in the body, a suction tube having an opening near a tip, a base end configured to be connectable to a suction device, and at least the tip being inserted into the body; a liquid delivery tube having a nozzle at a tip end, a base end configured to be connectable to a liquid delivery device for a solution, and a tip end extended to the opening of the suction tube; The suction tube is a liquid intake section in the vicinity of the tip, which draws the liquid in the body from the opening into the tube by the solution ejected from the nozzle of the liquid delivery tube; a mixing section that mixes the stored liquid drawn into the tube with the injected solution to form an emulsion in which the stored liquid is dispersed in the solution, and that transports the formed emulsion toward the base end of the suction tube; The negative pressure applied by the suction device to the proximal end of the suction tube is the absolute value of which is greater than the positive pressure at which the liquid delivery device delivers the solution Medical suction devices.

7. Furthermore, the device is provided with a switch that can be operated by an operator and that can independently switch between suction and stop by the suction device and between suction and stop by the liquid delivery device. The medical suction device according to any one of claims 1 to 6.

8. The fluid buildup in the body is an ovarian cyst The medical suction device according to any one of claims 1 to 7.

9. A medical suction device for suctioning and collecting accumulated fluids in the body, a suction tube having an opening near a tip, a base end configured to be connectable to a suction device, and at least the tip being inserted into the body; a liquid delivery tube having a nozzle at a tip end, a base end configured to be connectable to a liquid delivery device for a solution, and a tip end extended to the opening of the suction tube; The suction tube is a notch portion located in front of the tip of the liquid delivery tube provided on the peripheral surface, the notch portion being cut radially from the peripheral surface by a predetermined length or more at an opening edge opened on the peripheral surface of the suction tube, allowing the accumulated liquid in the body to enter; a slope formed on the base end side of the notch portion, smoothly inclined to the circumferential surface of the aspirating tube, and constituting a positional relationship in which the solution ejected from the tip of the liquid delivery tube disposed above collides with the stored liquid that has entered the notch portion; a curved end portion located at the tip of the suction tube, which bulges out in a semispherical convex shape toward the tip of the suction tube to close the tube, and which is in a positional relationship where it intersects with an extension of the tube axis of the liquid delivery tube; Medical suction devices.

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