Medical suction tip and suction tube with medical suction tip

Abstract

This invention relates to a medical suction tip for aspirating and draining bodily fluids and lavage fluids that seep out during surgery on living tissue. [Solution] The present invention relates to a medical suction tip having a suction portion and a connecting portion, the tip having a groove to prevent blockage and a side hole near the end. When the suction tip is connected to one end of a flexible suction tube and the other end is connected to a medical suction device and driven by negative pressure, it has excellent fixation to the biological tissue of the surgical site, eliminating the need to switch the surgical device to a suction tube during surgery.

Description

[Technical Field]

[0001] This invention relates to a medical suction tip for aspirating and draining bodily fluids and lavage fluids that seep out during surgery on living tissue. In particular, it relates to a medical suction tip suitable for surgical robotic surgery and microsurgery. [Background technology]

[0002] Conventionally, to remove bodily fluids and lavage fluids seeping into the surgical field during surgical procedures, a method has been employed in which a suction nozzle with a hole at its tip is connected to an external suction device via a suction tube circuit to remove the fluids by suction (for example, Patent Documents 1 and 2). Furthermore, in endoscopic surgery using a surgical robot, a suction device has been proposed that has a porous material such as gauze or sponge attached to the tip of the suction tube to prevent the suction tube from interfering with and damaging the tissue. (Patent Document 3) Furthermore, in microsurgery, an ultra-fine surgical procedure that skillfully uses needles and threads thinner than a strand of hair and forceps to grasp them, highly advanced surgical techniques are performed, such as anastomoses of lymphatic vessels and veins smaller than 0.5 mm and tissue transplantation, all viewed through a microscope. In such surgeries, the surgical procedure is paused to suction saline solution used to clean the surgical field and aspirates any exudating bodily fluids in order to maintain a clear view, and these fluids are then removed using suction tubes or gauze. [Prior art documents] [Patent Documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2000-354624 [Patent Document 2] Japanese Utility Model Publication No. 5-88552 [Patent Document 3] Japanese Patent Publication No. 2024-119780 [Overview of the project] [Problems that the invention aims to solve]

[0004] Because microsurgery involves a narrow surgical field, conventional suction tubes may be too large or lack flexibility, making insertion difficult. Large suction tubes, if left in the surgical field, not only interfere with the surgical procedure but also risk damaging living tissue. Therefore, when performing surgical procedures, the surgical instruments are kept outside the surgical field, and when suctioning and removing exudate or lavage fluid from the surgical field, the surgical instruments are switched to suction tubes. However, when switching instruments, the eyes must be taken away from the surgical site, which contains tiny lymphatic vessels and blood vessels, thus disrupting the continuity of the surgery and requiring extra effort to maintain concentration. If lymphatic fluid continuously leaks from the incised surgical field, it can interfere with the surgery, prolonging the procedure and making the work more complicated. Furthermore, conventional suction tubes may have multiple side holes on the side wall of the tip in addition to the suction port at the end of the tube. However, if the suction holes become clogged with biological tissue fragments from the surgical site, or if the holes are too large or there are too many of them, air may be drawn in through holes that do not contribute to suction, reducing the suction force and hindering continuous suction.

[0005] The present invention aims to solve the above problems and provide a medical suction tip that can continuously aspirate and drain bodily fluids and lavage fluids that seep out during surgery on living tissue without having to stop the surgery. The present invention also relates to a suction tube having the medical suction tip at its tip and used in connection with a medical suction device. [Means for solving the problem]

[0006] These objectives are achieved by the present invention as described in (1) to (15) below.

[0007] (1) A substantially straight suction section having a tip, a rear end, an outer surface, and a lumen of the suction section, and a substantially straight connecting section having a tip, a rear end, an outer surface, and a lumen of the connecting section. The rear end of the suction portion and the front end of the connecting portion are continuous, the lumen of the suction portion and the lumen of the connecting portion are continuous, and the lumen of the suction portion and the lumen of the connecting portion share the same longitudinal axis. The tip of the suction portion has a tip groove that intersects with each other and opens towards the tip, and the suction portion has 3 to 6 side holes that penetrate from the outer surface of the suction portion to the inner lumen of the suction portion. The outer surface of the connecting portion and the outer surface of the suction portion are connected by a stepped portion, and the outer surface of the connecting portion has a convex portion that is continuous in the circumferential direction and protrudes outward. One end of a flexible suction tube is fitted onto the outer surface of the connection part, and the other end of the suction tube is connectable to a medical suction device. A medical suction tip characterized in that, when connected to a medical suction device via the suction tube and driven by negative pressure, the tip of the suction portion adheres to the biological tissue, thereby maintaining fixation with the biological tissue.

[0008] (2) The tip groove extends in two directions on a plane perpendicular to the longitudinal axis of the lumen of the suction portion, The width of the tip groove is smaller than the diameter of the lumen of the suction part at the tip of the suction part, ranging from 0.1 mm to 1 mm, and its depth is ranging from 0.3 mm to 2 mm. The sum of the opening areas of the side holes on the outer surface of the suction portion is 0.21 mm 2 From 4.71mm 2 And, The medical suction tip according to (1), characterized in that the longitudinal axis length of the suction portion is 4 mm to 35 mm, the longitudinal axis length of the connecting portion is 5 mm to 13 mm, the diameter of the tip of the lumen of the suction portion is 0.5 mm to 3.5 mm, the difference between the maximum diameter of the outer surface of the suction portion and the diameter of the lumen of the suction portion in the region of the suction portion without side holes, on a plane perpendicular to the longitudinal axis, is 1.2 mm to 2.5 mm, the maximum diameter of the outer surface of the suction portion is greater than the diameter of the outer surface of the connecting portion, and the total weight of the suction portion and the connecting portion is 0.25 g to 4.5 g.

[0009] (3) The medical suction tip according to (1), characterized in that the diameter of the lumen of the connecting portion is the same as or larger than the diameter of the lumen of the suction portion, the diameter of the lumen of the suction portion is larger at the rear end of the suction portion than at the tip of the suction portion, the diameter of the tip of the lumen of the suction portion is 0.6 mm to 3.5 mm, and the diameter of the rear end of the lumen of the connecting portion is 0.8 mm to 4 mm.

[0010] (4) The medical suction tip according to (1), characterized in that it has means for securing the medical tip to the surgical field or holding it in another device.

[0011] (5) The medical suction tip according to (4), characterized in that the connecting means is a tethering member having a fixing portion that can be fixed to the suction tube or the suction tip and a locking portion used for tethering to the surgical field.

[0012] (6) The medical suction tip according to (5), characterized in that the mooring member has an insertion portion through which the suction tube or the suction tip is inserted and a locking portion through which a needle body can be inserted.

[0013] (7) The medical suction tip according to (4), characterized in that the connecting means is a retained member having a fixing portion that can be fixed to the suction tube or the suction tip and a retaining portion that can hold the other device.

[0014] (8) A medical suction tip having a substantially straight suction section having a tip of the suction section, a rear end of the suction section, an outer surface of the suction section, and a lumen of the suction section, and a substantially straight connector having a tip of the connector section, a rear end of the connector section, an outer surface of the connector section, and a lumen of the connector section, The suction tube is made of a flexible tube having one end fitted onto the outer surface of the connection part and the other end having a suction device connection connector that can be connected to a medical suction device. The rear end of the suction portion and the front end of the connecting portion are continuous, the lumen of the suction portion and the lumen of the connecting portion are continuous, and the lumen of the suction portion and the lumen of the connecting portion share the same longitudinal axis. The tip of the suction part has tip groove parts that cross each other and open to the tip side. The suction part has 3 to 6 side holes penetrating from the outer surface of the suction part to the inner cavity of the suction part. The outer surface of the connection part and the outer surface of the suction part are connected by a step part, and the outer surface of the connection part has a convex part that is continuous in the circumferential direction and protrudes outward. When connected to a medical suction device via the suction tube and driven by negative pressure, the tip of the suction part adheres to the biological tissue, thereby maintaining fixation with the biological tissue. A medical suction tube characterized by this.

[0015] (9) The tip groove part extends in two directions on a plane perpendicular to the longitudinal axis of the inner cavity of the suction part. The width of the tip groove part is smaller than the diameter of the inner cavity of the suction part at the tip of the suction part, is 0.1 mm to 1 mm, and the depth is 0.3 mm to 2 mm. The total opening area of the side holes on the outer surface of the suction part is 0.21 mm 2 to 4.71 mm 2 and The length of the suction part in the longitudinal axis direction is 4 mm to 35 mm, the length of the connection part in the longitudinal axis direction is 5 mm to 13 mm, the diameter of the tip part of the inner cavity of the suction part is 0.5 mm to 3.5 mm, the difference between the maximum diameter of the outer surface of the suction part on a plane perpendicular to the longitudinal axis in the region where the side holes of the suction part are absent and the diameter of the inner cavity of the suction part is 1.2 mm to 2.5 mm, the maximum diameter of the outer surface of the suction part is larger than the diameter of the outer surface of the connection part, and the total weight of the suction part and the connection part is 0.25 g to 4.5 g. The medical suction tube according to (8) above, characterized by this.

[0016] (10) The diameter of the inner cavity of the connection part is the same as or larger than the diameter of the inner cavity of the suction part, the diameter of the inner cavity of the suction part is larger at the rear end part of the suction part than at the tip part of the suction part, the diameter of the tip part of the inner cavity of the suction part is 0.6 mm to 3.5 mm, and the diameter of the rear end part of the inner cavity of the connection part is 0.8 mm to 4 mm. The medical suction tube according to (8) above, characterized by this.

[0017] (11) The medical suction tube according to (8), characterized in that it has means for securing the vicinity of the medical suction tip of the suction tube or at least a portion of the medical suction tip to the surgical field or for holding it to another device.

[0018] (12) The medical suction tube according to (11), characterized in that the connecting means is a tethering member having a fixing portion that can be fixed to the suction tube or the suction tip and a locking portion used for tethering to the surgical field.

[0019] (13) The medical suction tube according to (12), characterized in that the mooring member has an insertion portion through which the suction tube or the suction tip is inserted and a locking portion through which a needle body can be inserted.

[0020] (14) The medical suction tube according to (11), characterized in that the connecting means is a member to be held having a fixing portion that can be fixed to the suction tube or the suction tip and a holding portion that can hold the other device.

[0021] (15) A substantially straight suction section having a tip, a rear end, an outer surface, and a lumen of the suction section, and a substantially straight connecting section having a tip, a rear end, an outer surface, and a lumen of the connecting section, The rear end of the suction portion and the front end of the connecting portion are continuous, the lumen of the suction portion and the lumen of the connecting portion are continuous, and the lumen of the suction portion and the lumen of the connecting portion share the same longitudinal axis. The tip of the suction portion has a tip groove that intersects with each other and opens towards the tip side, The width of the tip groove is smaller than the diameter of the lumen of the suction part at the tip of the suction part, ranging from 0.1 mm to 1 mm, and its depth is ranging from 0.3 mm to 2 mm. The suction portion has three to six side holes that penetrate from the outer surface of the suction portion to the inner lumen of the suction portion. The sum of the opening areas of the side holes on the outer surface of the suction portion is 0.21 mm 2 From 4.71mm 2 And, The outer surface of the connecting portion and the outer surface of the suction portion are connected by a stepped portion, and the outer surface of the connecting portion has a convex portion that is continuous in the circumferential direction and protrudes away from the longitudinal axis. A medical suction tip characterized in that the longitudinal axis length of the suction portion is 4 mm to 35 mm, the longitudinal axis length of the connecting portion is 5 mm to 13 mm, the diameter of the tip of the lumen of the suction portion is 0.5 mm to 3.5 mm, the difference between the maximum diameter of the outer surface of the suction portion and the diameter of the lumen of the suction portion in the region of the suction portion without side holes, on a plane perpendicular to the longitudinal axis, is 1.2 mm to 2.5 mm, the maximum diameter of the outer surface of the suction portion is greater than the diameter of the outer surface of the connecting portion, and the total weight of the suction portion and the connecting portion is 0.25 g to 4.5 g. [Effects of the Invention]

[0022] The present invention, as described in (1) to (15) above, offers excellent fixation to biological tissue in a reduced-pressure driven state, allowing it to maintain a fixed state on the biological tissue, and eliminating the need to stop the surgery when aspirating and draining bodily fluids or lavage fluids that seep out during surgery on biological tissue. Furthermore, the present invention allows for continuous aspiration and drainage of bodily fluids or lavage fluids that seep out during surgery on biological tissue. Moreover, the present invention allows for fixation to the biological tissue or its surroundings when aspirating and draining bodily fluids or lavage fluids that seep out during surgery on biological tissue. [Brief explanation of the drawing]

[0023] [Figure 1] This figure shows one embodiment of the medical suction tube of the present invention. [Figure 2] This schematic diagram shows how, when a medical suction tube having the medical suction tip of the present invention is applied to biological tissue and connected to a medical suction device (not shown) and driven by negative pressure, the tip of the suction portion adheres to the biological tissue, thereby maintaining fixation. [Figure 3] These are a front view (Figure 3-1), a side view (Figure 3-2), and a cross-sectional view (Figure 3-3) of one embodiment of the medical suction tip of the present invention. [Figure 4]These are a front view (Figure 4-1), a side view (Figure 4-2), and a cross-sectional view (Figure 4-3) of another embodiment of the medical suction tip of the present invention. [Figure 5] This is a schematic diagram of one embodiment of the present invention, which has a mooring member as a means of connecting a medical suction tube, and shows a fishhook-shaped hook with a needle body piercing through it. [Figure 6] This is a schematic diagram of another embodiment of a mooring member that can be combined with a medical suction tube of the present invention. [Figure 7] As a means of collaboration in the present invention, Figure 7-1 shows a side view of one embodiment of the member to be held, and Figure 7-2 shows a diagram of its combination with a suction tip. [Modes for carrying out the invention]

[0024] The present invention has the features described above, and below, the medical suction tip and medical suction tube of the present invention will be described in detail. Note that the following embodiments do not limit the invention as defined in the claims. While the embodiments describe multiple features, not all of these features are necessarily essential to the present invention. Figure 1 shows the configuration of one embodiment of the medical suction tube of the present invention. As shown in Figure 1, the medical suction tube 1 of the present invention has a device-side connector 3 for connecting to a medical suction device (not shown), a suction tube 4, and a medical suction tip 2 (hereinafter referred to as the suction tip). The device-side connector 3 only needs to be connectable to the pressure relief port of a medical suction device. Furthermore, various device-side connectors can be prepared to adapt to the shape of the pressure relief port of different medical suction devices, or various adapters adapted to adapt to the pressure relief port can be used. The suction tube 4 is made of a flexible tube and should be connectable to both the device-side connector 3 and the suction tip 2. However, it should not collapse under reduced pressure for suction, and when used in narrow or deep surgical fields in microsurgery, a tube hardness of 60° or less is preferable. More preferably, the tube hardness is between 20° and 50°. Suitable materials for the suction tube 2 include silicone, polyurethane, and olefin-based elastomers. The outer diameter of the suction tube 4 is preferably 1.5 to 5.5 mm, more preferably 2.5 to 4.0 mm, and the inner diameter is preferably 0.8 to 5.0 mm, more preferably 1.8 to 3.2 mm. If the suction tube 4 is too rigid, any force applied to the suction tube 4 from another source will affect the suction tip 2, making it prone to shifting position.

[0025] Figure 2 is a schematic diagram showing how, when a medical suction tube 1 having a suction tip 2 is applied to living tissue and connected to a medical suction device (not shown) and driven by negative pressure, the tip of the suction section 110 adheres to the living tissue, thereby maintaining fixation with the living tissue. Medical suction devices include those connected via a liquid trap to a suction source installed at the bedside as part of the medical gas piping system of a medical facility, and independent types that combine an electric pump and a liquid trap. These devices are driven at a pressure reduction level of approximately -40 to -70 kPa. When the suction tube 1 having the suction tip 2 of the present invention is used in the surgical field of a living body with such a medical suction device, it has a unique configuration described later. As shown in Figure 2, the tip of the suction tip adheres to the surface of the living tissue in the surgical field, and despite the connection of the suction tube 4, the suction tip 2 maintains fixation with the living tissue, and when placed on flat living tissue, it can maintain an upright position. The suction tip 2 adheres to biological tissue, maintaining fixation while continuously aspirating exudate and lavage fluid from surrounding tissues, eliminating the need to switch surgical instruments to a suction tube for fluid aspiration. Consequently, surgeons can maintain focus on the surgical site, even when lymphatic fluid is continuously overflowing, as they do not need to take their eyes off the delicate lymphatic vessels and blood vessels. Furthermore, the suction tip 2 can be accurately positioned even in surgeries with a narrow surgical field.

[0026] Figure 3 shows a front view (Figure 3-1), a side view (Figure 3-2), and a cross-sectional view of the PP surface (Figure 3-3) of one embodiment of the medical suction tip of the present invention. The suction tip 2 has a substantially straight suction section 100 having a suction tip 110, a suction rear end 120, a suction outer surface 101, and a suction lumen 102, and a substantially straight connecting section 200 having a connecting tip 210, a connecting rear end 220, a connecting outer surface 201, and a connecting lumen 202. The length A of the suction section 100 is preferably 4 to 45 mm, more preferably 6 to 35 mm. The length B of the connecting section 200 is preferably 5 to 15 mm, more preferably 6 to 13 mm. Here, "substantially straight" means that even if there are some irregularities in the external shape, the overall structure is considered to have a straight central axis.

[0027] The rear end 120 of the suction section and the front end 210 of the connecting section are continuous. Furthermore, the lumen 102 of the suction section and the lumen 202 of the connecting section form a continuous cavity. The lumen 102 of the suction section and the lumen 202 of the connecting section share the same longitudinal axis 300. The diameter of the lumen 102 of the front end 110 of the suction section and the diameter of the lumen 202 of the rear end 220 of the connecting section are substantially the same, and the diameter D of the lumen 102 of the front end 110 of the suction section is preferably 0.5 to 3.5 mm, more preferably 0.6 to 3.0 mm. The suction section 100 and the connecting section 200 in this embodiment can be formed as a single unit by cutting from a single material, or by metal 3D printing, lost wax casting, or metal injection molding. Here, "substantially identical" does not mean that they must be completely identical, but rather that variations and errors that occur during the manufacturing process are included. The following dimensions will be used mutatis mutandis.

[0028] The tip portion 110 of the suction section has two tip grooves (103a, 103b) that intersect each other near the end of the lumen 102 of the suction section and open towards the tip. The two intersecting tip grooves (103a, 103b) extend in two directions in a plane perpendicular to the longitudinal axis 300. The angle of intersection is preferably 60° to 90° for the smaller angle. The width E of the tip grooves (103a, 103b) is preferably 0.1 to 1 mm, more preferably 0.3 to 0.65 mm, and the depth F is preferably 0.3 to 2 mm, more preferably 0.5 to 1.0 mm. By having these tip grooves, it is possible to prevent the entire tip opening of the lumen 102 of the suction section from being blocked when biological tissue is attracted to it.

[0029] The maximum diameter C of the outer surface 101 of the suction portion on a plane perpendicular to the longitudinal axis 300 is preferably 2.0 to 5.5 mm, and more preferably 2.5 to 5.0 mm. Furthermore, the difference between the maximum diameter C (the maximum diameter of the outer surface 101 of the suction portion on a plane perpendicular to the longitudinal axis 300 in the region of the suction portion 100 where there are no side holes 104) and the diameter D (the diameter of the lumen 102 of the suction portion at the tip 110 of the suction portion) is preferably 1.2 mm to 2.5 mm, and more preferably 1.5 to 2.0 mm.

[0030] The suction section 100 has 3 to 6 side holes 104 that penetrate from the outer surface 101 of the suction section to the inner lumen 102 of the suction section. Preferably, it has 4 side holes 104. Furthermore, it is preferable that each side hole 104 is provided at equal angular intervals around a circle centered on the longitudinal axis 300 on a plane perpendicular to the longitudinal axis 300. Furthermore, it is preferable that at least one of each side hole 104 is located at a different distance from the tip 110 of the suction section compared to the other side holes 104. It is preferable that the center position of the opening of each side hole 104 is located closer to the tip of the suction part 100 than the center position in the longitudinal axis direction, and more preferably within 5 mm from the tip of the suction part 110, and more preferably within 4 mm. Furthermore, the diameter of each side hole 104 is preferably 0.3 to 1.0 mm, and more preferably 0.5 to 0.7 mm. It is also preferable that the diameter of the side hole 104 is substantially the same from the outer surface 101 of the suction section to the inner lumen 102 of the suction section. Furthermore, it is preferable that the diameter of the side hole 104 is smaller than the diameter D of the inner lumen 102 of the suction section at the tip 110 of the suction section. In addition, the sum of the areas of the openings 106 on the outer surface 101 of the suction section for all side holes 104 is preferably 0.21 to 4.71 mm. 2 And more preferably 0.59 to 2.31 mm 2 As described above, the setting of the side holes 104 prevents the ends of the suction section lumen 102 and the side holes 104 from becoming blocked by suction from biological tissue, allowing for the suction of exudate and washing fluids present on the biological tissue. Furthermore, the suction tip 2 can adhere to the biological tissue and maintain fixation with the biological tissue while continuing to suction exudate and washing fluids from surrounding tissues, and it reduces the likelihood of obstruction of suction by tissue fragments or other debris. When the biological tissue is flat, the suction tip 2 can maintain an upright position while continuing to suction exudate and washing fluids.

[0031] The outer surface 201 of the connecting part and the outer surface 101 of the suction part are connected by a stepped portion 150. The suction part 100 and the connecting part 200 share a longitudinal axis 300, and the maximum diameter of the outer surface 101 of the suction part is larger than the diameter of the outer surface 201 of the connecting part. The stepped portion 150 is a step that arises from the difference in dimensions between the outer surface 201 of the connecting part tip 210 and the outer surface 101 of the suction part rear end 120. The difference between the maximum diameter of the outer surface 101 of the suction portion and the diameter of the lumen 104 of the suction portion in a plane perpendicular to the longitudinal axis 300 in the region of the suction portion 100 where there are no side holes 104 is preferably 1.2 to 2.5 mm, and more preferably 1.5 to 3.0 mm.

[0032] The outer surface 102 of the connection portion has at least one protrusion 204 that is continuous in the circumferential direction and protrudes outward. The tops of the protrusions 204 protrude at substantially the same height in the circumferential direction. That is, since the protrusions 204 protrude from the outer surface 201 of the connection portion without interruption in the circumferential direction, high liquid tightness can be obtained when the suction tube 4 is connected. It is preferable that multiple protrusions 204 are provided at different distances from the rear end 220 of the connection portion. One end of the flexible suction tube 4 is fitted onto the outer surface 201 of the connection portion, and the other end of the suction tube 4 is connected to the device-side connector 3.

[0033] The total weight of the suction tip 2, including the suction section 100 and the connecting section 200, is preferably 0.25 to 4.5 g, and more preferably 0.3 to 3.0 g. By setting the weight within an appropriate range, the suction tip 2 can easily sink into the tissue exudate or irrigation fluid under its own weight, making it easy to handle and position in the appropriate location in the surgical field. If it is lighter than this, the suction tip 2 is more likely to move and may easily move away from the desired position. The suction tip 2 is preferably made of stainless steel or brass plated with nickel or chromium. Furthermore, the outer surface of the suction tip 2 can be coated with an insulating resin or the like. This prevents electrical leakage even when in contact with an electrosurgical unit used in surgery. Furthermore, the outer surface of the suction tip can be blasted or textured to prevent it from slipping when lying on its side. Furthermore, the surface of the suction section lumen 102 and the connection section lumen 202 can be subjected to mirror polishing, water-repellent treatment, fluorine coating, etc. This improves the sliding properties of the lumen, allowing for suction of cuttings incised with a scalpel without clogging.

[0034] Figure 4 shows a front view (Figure 4-1), a side view (Figure 4-2), and a cross-sectional view in the QQ plane (Figure 4-3) of another embodiment of the medical suction tip of the present invention. In describing this embodiment, components identical to those of suction tip 2 are given the same numbers, and components different from suction tip 2 are described below. Unlike the suction tip 2 of the above embodiment, the suction tip 5 of this embodiment has a suction section lumen 152 and a connection section lumen 252 that widen in diameter from the suction section tip 110 to the connection section rear end 220. The suction tip 5 has a substantially straight suction portion 400 having a suction tip 410, a suction rear end 420, a suction outer surface 101, and a suction lumen 402, and a substantially straight connecting portion 500 having a connecting tip 410, a connecting rear end 420, a connecting outer surface 201, and a connecting lumen 502. The diameter G of the lumen 402 of the suction tip 410 is smaller than the diameter H of the lumen 502 of the connecting portion 520, and has a tapered shape that widens from the suction tip 410 to the connecting portion 520. The diameter G is preferably 0.6 to 3.5 mm, more preferably 0.8 to 2.5 mm. The diameter H is preferably 0.8 to 4.0 mm, more preferably 1.0 to 3.5 mm. Furthermore, the ratio of the diameter H to the diameter G is preferably 1:1.1 to 1:1.3, and more preferably 1:1.23 to 1:1.35. With this configuration, the suction tip 5 of the present invention can improve the likelihood of clogging of the lumen 402 of the suction portion and the lumen 502 of the connecting portion by biological tissue fragments, etc.

[0035] Figure 5 is a schematic diagram of one embodiment of the present invention having a mooring member as a means of connecting in a medical suction tube, and is a schematic diagram in which the needle body of a fishhook-type hook is inserted through the mooring portion. Figure 6 is a schematic diagram of another embodiment of a mooring member that can be combined with the medical suction tube 1 of the present invention. The mooring member 600 is an embodiment of the linking means of the present invention and has a fixing portion 610 that can be fixed to the suction tube 4 and the suction tip 2, and a locking portion 620 for positioning the mooring member 600 in the surgical field. The fixing portion 610 has an insertion hole 612 through which the suction tube 4, the connecting portion 200, and the suction portion 100 are inserted. The mooring member 600 is made of an elastic resin material such as rubber or elastomer, and is X-ray contrast-enhanced. The insertion hole 612 of the fixing part 610 expands elastically, allowing the suction tube 4 and suction tip 2 to be inserted. The locking part 620 is also made of an elastic resin material, allowing the needle body of a fishhook to be inserted. In Figure 5, a fishhook-type hook 700 consisting of a needle body 710 and a locking thread 730 for pulling the needle body 710 is used to insert the needle body 710 through the locking part 620 and lock the locking thread 730 to the periphery of the surgical field (not shown), thereby mooring the vicinity of the suction tip of the suction tube 4 or the suction tip 2 to a desired position in the surgical field.

[0036] In contrast to the fixing portion 610 of the mooring member 600 in Figure 5, which is an insertion hole, the mooring member 650 in Figure 6 has a notch 664 in part of the insertion hole 662 of the fixing portion 660, which allows the suction tube 4 and suction tip 2 to be inserted, or it is possible to fit them in without inserting them by utilizing the elasticity of the material of the mooring member 650. The mooring member 650 has a locking portion 670 for positioning it in the surgical field.

[0037] Figure 7 shows a side view (Figure 7-1) of one embodiment of the member to be held as a means of cooperation according to the present invention, and a diagram of its combination with a suction tip (Figure 7-2). The retained member 800 is fixed to the suction tip 2 by abutting its fixing portion 810 against the stepped portion 150 between the suction portion 100 and the connecting portion 200 of the suction tip 2 of the present invention, and fitting the suction tube 2 into the connecting portion 200. The retained member 800 has a holding portion 820 that extends outward from the suction tip 2 and further extends along the suction tip. The retained portion 800 of the present invention can be made of hard plastic or metal material. In particular, the holding portion 820 is gripped by a metal device such as forceps or tweezers, so it is preferable that it be made of metal.

[0038] The means of collaboration of the present invention are not limited to those described above, and it is sufficient if the medical chip of the present invention can be anchored to the surgical field or held by another device. The anchoring member of the present invention may have a fixing portion for fixing the vicinity of the suction tip of the suction tube or at least a part of the suction tip of the suction tube of a medical suction tube, and an anchoring portion for locking to the other device, in order to anchor the vicinity of the suction tip or at least a part of the suction tip of the suction tube to another device such as the fishhook-shaped hook. Furthermore, since bleeding and bodily fluids can come out from any direction, the holding member of the present invention is particularly effective when moving the suction tip during surgery. The suction tip is moved by grasping it with forceps or tweezers, but even when the suction tip is grasped tightly with forceps, the surgery can be performed with peace of mind by providing an appropriate holding member that can be held by surgical devices such as forceps to prevent damage to the suction tip or suction tube. Other devices include common surgical instruments such as hooks and forceps used in surgery, robotic forceps used in endoscopic surgery such as laparoscopy and thoracoscopy, and robotic surgical assistance.

[0039] (Example 1) The suction tube shown in Figure 1 was created using a suction tip and suction tube of the following sizes. Chicken thigh meat for consumption was placed in a tray containing physiological saline solution as a model of biological tissue, and the created suction tube was subjected to a suction state at a pressure of -40 kPa. The suction tube was grasped, and the tip of the suction tip was placed on the thigh meat in saline solution. Physiological saline solution was drawn from the tip of the suction tip, and the suction tube was connected only to a medical suction device and not supported by anything else. In this embodiment, the suction tube maintained fixation to the thigh meat while continuing to suction from the tip opening and side holes of the suction tip. Also, even when the physiological saline decreased and the side holes on the side far from the thigh meat were exposed, the surrounding physiological saline was continuously aspirated while maintaining the fixation to the thigh meat, and the fixation to the thigh meat was maintained even when the physiological saline disappeared from the thigh meat. When the tip of the aspiration chip was adsorbed to the flat part of the thigh meat, the standing position was maintained as shown in Fig. 2. (Suction tube) Tube hardness: 50°, Material: silicone, Outer diameter of the suction tube: 2.5 mm, Inner diameter: 1.5 mm (Suction tip) Length A of the suction part: 8.5 mm, Length B of the connection part: 7.0 mm Diameter D of the suction lumen at the tip of the suction part: 1.0 mm Crossing angle of the tip groove part: 90°, Width E of the tip groove part: 0.65 mm, Depth F: 1 mm Maximum diameter C of the outer surface of the suction part: 2.5 mm, Difference between the maximum diameter C and the diameter D: 1.5 mm Diameter of each side hole: 0.65 mm Center position of each side hole: Two opposed at a position 3 mm from the tip of the suction part, and two more opposed at a position 4 mm from the tip of the suction part at an angle of 90° from the previous side hole Total area of the side hole openings: 5.3 mm 2 Total weight of the suction tip: 0.3 g, Material: brass with chrome plating

[0040] (Example 2) Compared with Example 1, it was made in the same manner except for the following dimensions and the same evaluation was performed, but the results were the same. Diameter G of the suction lumen at the tip of the suction part: 0.8 mm Diameter H of the connection lumen at the rear end of the connection part: 1.0 mm Difference between the maximum diameter C and the diameter G: 1.7 mm Ratio of the diameter H to the diameter G: 1:1.25

[0041] Although the present invention has been described above with reference to embodiments, the present invention is not limited to those described above, and inventions modified in a manner that does not contradict the present invention, as well as inventions equivalent to the present invention, are also included in the present invention. [Explanation of Symbols]

[0042] 1. Medical suction tube 2 Medical suction tips 3. Device-side connector 4. Suction tube 5 Medical suction tips 100 Suction part 101 External surface of suction part 102 Suction section lumen 103, 103a, 103b Tip groove 104 Side hole 106 Opening of side holes 110 Suction part tip 120 Rear end of suction section 200 connection part 201 Outer surface of connection part 202 Lumen of the connection 204 Convex part 210 Connection tip 220 Rear end of connection 300 Long axis 400 Suction part 402 Suction section lumen 410 Suction part tip 420 Rear end of suction section 500 connection part 502 Lumen of connection 510 Connection tip 520 Rear end of connection 600 Mooring member 610 Fixed part 612 Through hole 620 Locking part 650 Mooring member 660 Fixed part 662 Through hole 664 Notch 670 Locking part 700 Fishing hook type hooks 710 Needle Body 730 Securing thread 800 Held member 810 Fixed part 820 Holding part

Claims

1. It consists of a substantially straight suction section having a tip, a rear end, an outer surface, and a lumen, and a substantially straight connecting section having a tip, a rear end, an outer surface, and a lumen. The rear end of the suction portion and the front end of the connecting portion are continuous, the lumen of the suction portion and the lumen of the connecting portion are continuous, and the lumen of the suction portion and the lumen of the connecting portion share the same longitudinal axis. The tip of the suction portion has a tip groove that intersects with each other and opens towards the tip side, The suction portion has three to six side holes that penetrate from the outer surface of the suction portion to the inner lumen of the suction portion. The outer surface of the connecting portion and the outer surface of the suction portion are connected by a stepped portion, and the outer surface of the connecting portion has a convex portion that is continuous in the circumferential direction and protrudes outward. One end of a flexible tube is fitted onto the outer surface of the connection part, and the other end of the flexible tube is connectable to a medical suction device. When connected to a medical suction device via the aforementioned flexible tube and driven by negative pressure, the tip of the suction part adheres to the biological tissue, thereby maintaining fixation with the biological tissue. A medical suction tip characterized by the following features.

2. The aforementioned tip groove extends in two directions on a plane perpendicular to the longitudinal axis of the lumen of the suction portion, The width of the tip groove is smaller than the diameter of the lumen of the suction part at the tip of the suction part, ranging from 0.1 mm to 1 mm, and its depth is ranging from 0.3 mm to 2 mm. The sum of the opening areas of the side holes on the outer surface of the suction portion is 0.21 mm ２ 4.71 mm ２ And, The longitudinal length of the suction portion is 4 mm to 35 mm, the longitudinal length of the connecting portion is 5 mm to 13 mm, the diameter of the tip of the lumen of the suction portion is 0.5 mm to 3.5 mm, the difference between the maximum diameter of the outer surface of the suction portion and the diameter of the lumen of the suction portion in the region of the suction portion without side holes, on a plane perpendicular to the longitudinal axis, is 1.2 mm to 2.5 mm, the maximum diameter of the outer surface of the suction portion is greater than the diameter of the outer surface of the connecting portion, and the total weight of the suction portion and the connecting portion is 0.3 g to 4.5 g. The medical suction tip according to feature 1.

3. The diameter of the lumen of the connecting portion is the same as or larger than the diameter of the lumen of the suction portion, the diameter of the lumen of the suction portion is larger at the rear end of the suction portion than at the tip of the suction portion, the diameter of the tip of the lumen of the suction portion is 0.6 mm to 3.5 mm, and the diameter of the rear end of the lumen of the connecting portion is 0.8 mm to 4 mm. The medical suction tip according to feature 1.

4. The medical suction tip according to claim 1, characterized in that it has means for securing the medical suction tip to the surgical field or holding it in place with another device.

5. A medical suction tip having a substantially straight suction section having a suction tip, a suction rear end, an outer surface of the suction section, and a lumen of the suction section, and a substantially straight connector having a connector tip, a connector rear end, an outer surface of the connector, and a lumen of the connector, The flexible tube has one end fitted onto the outer surface of the aforementioned connection part and the other end has a suction device connection connector that can be connected to a medical suction device. The rear end of the suction portion and the front end of the connecting portion are continuous, the lumen of the suction portion and the lumen of the connecting portion are continuous, and the lumen of the suction portion and the lumen of the connecting portion share the same longitudinal axis. The tip of the suction portion has a tip groove that intersects with each other and opens towards the tip side, The suction portion has three to six side holes that penetrate from the outer surface of the suction portion to the inner lumen of the suction portion. The outer surface of the connecting portion and the outer surface of the suction portion are connected by a stepped portion, and the outer surface of the connecting portion has a convex portion that is continuous in the circumferential direction and protrudes outward. When connected to a medical suction device via the aforementioned flexible tube and driven by negative pressure, the tip of the suction part adheres to the biological tissue, thereby maintaining fixation with the biological tissue. A medical suction tube characterized by the following features.

6. The aforementioned tip groove extends in two directions on a plane perpendicular to the longitudinal axis of the lumen of the suction portion, The width of the tip groove is smaller than the diameter of the lumen of the suction part at the tip of the suction part, ranging from 0.1 mm to 1 mm, and its depth is ranging from 0.3 mm to 2 mm. The sum of the opening areas of the side holes on the outer surface of the suction portion is 0.21 mm ２ 4.71 mm ２ And, The longitudinal length of the suction portion is 4 mm to 35 mm, the longitudinal length of the connecting portion is 5 mm to 13 mm, the diameter of the tip of the lumen of the suction portion is 0.5 mm to 3.5 mm, the difference between the maximum diameter of the outer surface of the suction portion and the diameter of the lumen of the suction portion in the region of the suction portion without side holes, on a plane perpendicular to the longitudinal axis, is 1.2 mm to 2.5 mm, the maximum diameter of the outer surface of the suction portion is greater than the diameter of the outer surface of the connecting portion, and the total weight of the suction portion and the connecting portion is 0.3 g to 4.5 g. The medical suction tube according to feature 5.

7. The diameter of the lumen of the connecting portion is the same as or larger than the diameter of the lumen of the suction portion, the diameter of the lumen of the suction portion is larger at the rear end of the suction portion than at the tip of the suction portion, the diameter of the tip of the lumen of the suction portion is 0.6 mm to 3.5 mm, and the diameter of the rear end of the lumen of the connecting portion is 0.8 mm to 4 mm. The medical suction tube according to feature 5.

8. The medical suction tube according to claim 5, characterized in that it has means for securing the flexible tube near the medical suction tip or the medical suction tip to the surgical field or holding it to another device.

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