Drainage devices

Abstract

To simplify treatment to hold a cannula substantially perpendicular to the abdomen or the chest in order to drain abdominal dropsy or pleural effusion.SOLUTION: A draining implement 1 includes: a cannula 2 detained in an abdominal cavity; a hub 3 connected to a base end part of the cannula 2; a puncture needle 4 inserted into the cannula 2 via the hub 3; a waste liquid tube 5 composed of a soft tube connected to the hub 3; and a holding part 6 holding the cannula 2 in a posture substantially perpendicular to a puncture part of a patient. The holding part 6 is fitted to the hub 3 and has patient side fixing parts 6b, 6c fixed to the patient.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drainage device for draining ascites accumulated in the abdominal cavity or pleural effusion accumulated in the thoracic cavity. [Background technology]

[0002] For example, ascites may accumulate in the abdominal cavity due to inflammation caused by cancer in the abdominal organs. This ascites must be drained, and an intravenous needle or a dialysis needle may be used for this drainage procedure.

[0003] Furthermore, Patent Document 1 discloses a puncture device for removing ascites and the like, which includes a T-shaped tube communicating with the base end of an outer tube, an inner needle that can be inserted into the outer tube via the T-shaped tube, and a drainage pipe connected to the T-shaped tube. During use, the inner needle is inserted into the outer tube and punctured into the abdomen to the desired depth, after which the inner needle is removed and a fixing fin provided midway through the drainage pipe is fixed near the affected area with adhesive tape or the like.

[0004] Patent Document 2 discloses an outer tube fixture for holding the outer tube of an indwelling needle inserted into the abdomen approximately perpendicular to the abdomen when draining ascites. The outer tube fixture has a top surface for fixing the outer tube and a side surface connected to the top surface for maintaining a constant distance between the top surface and the abdomen. The outer tube is held in a state where it is sandwiched in a slit formed in the top surface. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 11-4885 [Patent Document 2] Utility Model Registration No. 3215534 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, when draining ascites, it is possible to increase the efficiency of drainage by positioning the outer tube approximately perpendicular to the abdomen, as disclosed in Patent Document 2. However, when using an intravenous indwelling needle or a dialysis indwelling needle, these needles are inserted into blood vessels close to the body surface, so they are inserted in a direction that follows the body surface and are not intended to be held in an approximately perpendicular state.

[0007] One possible solution is to use the puncture device for removing ascites, etc., disclosed in Patent Document 1. This puncture device for removing ascites, etc., has a fixing fin provided midway through the drainage pipe that can be fixed near the affected area with adhesive tape, etc. However, because the drainage pipe is made of a soft material, fixing the fixing fin does not fix the outer tube, and therefore the angle of the outer tube cannot be maintained.

[0008] In contrast, it is believed that the outer tube can be held approximately perpendicular to the abdomen by using the outer tube fixture disclosed in Patent Document 2. However, because the outer tube fixture is separate from the outer tube, when fixing, the outer tube needs to be passed through a slit in the outer tube fixture and clamped, and in this clamped state, the outer tube needs to be fixed so as not to slip relative to the outer tube fixture, making the procedure complicated.

[0009] The present invention has been made in view of the above points, and its object is to facilitate the procedure of holding a cannula approximately perpendicular to the abdomen or chest in order to drain ascites or pleural effusion. [Means for solving the problem]

[0010] To achieve the above object, the first disclosure provides a drainage device for draining ascites accumulated in the abdominal cavity or pleural effusion accumulated in the chest, comprising a cannula whose tip is placed in the abdominal cavity, a hub connected to the proximal end of the cannula, a puncture needle inserted into the cannula via the hub and positioned so as to protrude from the tip of the cannula in the inserted state, a drainage tube made of a soft tube connected to the hub, and a holding part that holds the cannula in a position approximately perpendicular to the puncture site on the patient. The holding part is fixed to the hub and has a patient-side fixing part that is fixed to the patient.

[0011] According to this configuration, when the puncture needle is inserted into the cannula via the valve of the hub, the tip of the puncture needle is positioned so that it protrudes from the cannula. By puncturing the patient's abdomen in this state, the tip of the cannula can be positioned at a predetermined location within the abdominal cavity. Then, by fixing the patient-side fixing portion of the holding portion to the patient, the cannula is held in a position approximately perpendicular to the puncture site. Since the holding portion is fixed to the hub in advance, there is no need to fix the holding portion to the hub on-site, and relative positional deviation between the holding portion and the hub is suppressed. Furthermore, because the holding portion is made of a material harder than the drainage tube, the holding portion itself is less likely to deform, suppressing the cannula from losing its position. The same applies when the puncture needle is inserted into the chest to drain pleural effusion.

[0012] In a second disclosure, the hub has a valve body, and the puncture needle is inserted into the cannula through the valve body.

[0013] In a third disclosure, the holding portion is made of a material harder than the cannula.

[0014] In the fourth disclosure, the valve body is positioned on the extension line of the cannula in the hub, so that when removing the puncture needle from the cannula after puncture, it is only necessary to pull it out on the extension line of the cannula, making the procedure easier.

[0015] In the fifth disclosure, the tube connection portion to which the upstream portion of the waste liquid tube is connected is provided on the hub so as to protrude in a direction intersecting the extension line of the cannula. This means that the direction in which the puncture needle is removed from the cannula differs from the direction in which the upstream portion of the waste liquid tube extends, and the waste liquid tube does not get in the way when the puncture needle is removed from the cannula, making the procedure easier. Furthermore, the tube connection portion and the extension line of the cannula are positioned perpendicular to each other, which is effective in preventing the cannula from coming into contact with the waste liquid tube and becoming dislodged. The tube connection portion and the extension line of the cannula may also be positioned perpendicular to each other.

[0016] In the sixth disclosure, the hub is provided with a cannula connection tubular portion to which the upstream portion of the cannula is connected so as to protrude in the direction of the extension of the cannula, and the holding portion is attached to the cannula connection tubular portion. With this configuration, the holding portion can be brought close to the base end of the cannula, making it easier to maintain the position of the cannula.

[0017] In the seventh disclosure, the holding portion is in the form of a plate that is long in a predetermined direction, and an insertion hole into which the cannula connecting tube portion is inserted is formed in the middle of the longitudinal direction of the holding portion, and the holding portion is attached with the cannula connecting tube portion inserted into the insertion hole.

[0018] In the eighth disclosure, the patient side fixing portion is provided on one side and the other side of the longitudinal direction of the portion where the insertion hole of the holding portion is formed, so that the holding portion can be fixed to the patient at multiple points, thereby stabilizing the holding portion.

[0019] In the ninth disclosure, the holding portion is configured so that one and other longitudinal sides of the portion where the insertion hole is formed can be bent toward the tip of the cannula. That is, when the amount of ascites in the abdominal cavity is large, the cannula needs to be inserted deeply, so the one and other longitudinal sides of the holding portion can be left in a nearly flat shape without being bent. However, as the amount of ascites decreases, it is necessary to reduce the insertion depth of the cannula. In this case, by fixing the holding portion to the patient in a state where the one and other longitudinal sides are bent toward the tip of the cannula, the insertion depth of the cannula can be maintained at a shallow depth. The same applies when draining pleural effusion.

[0020] In the tenth disclosure, the cannula is provided with a scale indicating the depth of insertion into the body, which allows the user to visually check the depth of insertion of the cannula 2 into the body, making the insertion procedure easier. [Effects of the Invention]

[0021] As described above, since the holding portion that holds the cannula in a position approximately perpendicular to the puncture site of the patient in order to drain ascites or pleural effusion is fixed to the hub, procedures in which the cannula is held in the abdomen or approximately perpendicular to the abdomen can be easily performed. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a perspective view of a drainage device according to a first embodiment of the present invention, as viewed from above. [Figure 2] FIG. 1 is an exploded perspective view of a drainage device according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view of a drainage device according to a first embodiment of the present invention, viewed from below. [Figure 4] FIG. 1 is a side view of a drainage device according to a first embodiment of the present invention. [Figure 5] 1 is a view of a drainage device according to a first embodiment of the present invention, viewed from the drainage side. [Figure 6] 1 is a view of the drainage device according to the first embodiment of the present invention as seen from the puncture side. [Figure 7] FIG. 6 is a view equivalent to FIG. 5 when the puncture depth is deep. [Figure 8] FIG. 6 is a view equivalent to FIG. 5 when the puncture depth is shallow. [Figure 9] FIG. 5 is a view equivalent to FIG. 4 when the puncture depth is shallow. [Figure 10] FIG. 5 is a view corresponding to FIG. 4 according to a second embodiment of the present invention. [Figure 11] FIG. 4 is a view corresponding to FIG. 3 according to a second embodiment of the present invention. [Figure 12] FIG. 10 is a view corresponding to FIG. 1 according to a third embodiment of the present invention. [Figure 13] FIG. 8 is a view equivalent to FIG. 7 showing an example of use of the drainage device. DETAILED DESCRIPTION OF THE INVENTION

[0023] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following description of the preferred embodiments is merely exemplary in nature and is not intended to limit the present invention, its applications, or its uses.

[0024] (Embodiment 1) 1 shows a drainage device 1 according to a first embodiment of the present invention. The drainage device 1 is an instrument used in drainage procedures to drain ascites that has accumulated in the abdominal cavity, for example, due to inflammation caused by cancer in an abdominal organ. The drainage device 1 can also be used in drainage procedures to drain pleural effusion that has accumulated in the thoracic cavity, for example, due to inflammation caused by cancer in an abdominal organ. This drainage device 1 is used by medical professionals and can also be called a medical device.

[0025] The drainage device 1 comprises a cannula 2, a hub 3, a puncture needle 4, a waste tube 5, and a holder 6. The drainage device 1 is a disposable device that is discarded after a single use. Figures 1 and 2 show the puncture needle 4 removed from the cannula 2, while Figure 4 shows the puncture needle 4 inserted into the cannula 2.

[0026] The cannula 2 is a component consisting of a tubular body made of soft resin, and can also be called an outer needle or outer cylinder. Examples of resin materials that can be used to make the cannula 2 include polyurethane and Teflon. Using such a resin material can provide the cannula 2 with appropriate flexibility. For example, when a bending force is applied to the base end of the cannula 2 that has been inserted into a patient, the cannula 2 bends easily, preventing pain and damage to the patient's tissue. The cannula 2 is also designed to remain unbroken while inserted into the patient, ensuring an internal fluid flow path. The cannula 2 may be provided with a scale indicating the insertion depth into the body. This allows the insertion depth of the cannula 2 to be visually confirmed, facilitating the insertion procedure. The scale may be in millimeters or centimeters.

[0027] The cannula 2 has an opening at its tip, which is placed in the abdominal cavity. In addition, multiple openings 2a are provided at intervals in the centerline direction of the cannula 2, closer to the tip than the center in the centerline direction of the cannula 2. The opening directions of the multiple openings 2a can be set to be different from each other. By providing openings 2a on the side in addition to the opening at the tip, the total opening area is increased, making it easier for ascites to flow in. The part of the cannula 2 where the openings 2a are formed is the part that is placed in the abdominal cavity. In Figure 4, the extension of the centerline of the cannula 2 is indicated by the symbol 100.

[0028] Hub 3 is a member connected to the base end of cannula 2, and can also be called a connector member that connects the base end of cannula 2 and drainage tube 5. As shown in FIG. 2, hub 3 includes a cylindrical main body 31, a valve body 32, and a cover 33. Main body 31 and cover 33 are made of a hard resin material that is harder than the resin material that makes up cannula 2, and are rigid enough to not easily deform. Examples of resin materials that can be used for hub 3 include polypropylene and polycarbonate.

[0029] A tube connection tubular portion 31a, to which the upstream portion of the waste liquid tube 5 is connected, is provided on the main body portion 31 so as to protrude in a direction intersecting the extension line 100 of the cannula 2. With the upstream portion of the waste liquid tube 5 inserted into the tube connection tubular portion 31a, the connection is liquid-tight, for example, by adhesive bonding. The main body portion 31 is an integrally molded product, and a part of the main body portion 31 is the tube connection tubular portion 31a. Alternatively, the main body portion 31 and the tube connection tubular portion 31a may be formed as separate members, and the tube connection tubular portion 31a may be attached to the main body portion 31.

[0030] In this embodiment, the tube connection cylinder portion 31a protrudes in a direction perpendicular to the extension line 100 of the cannula 2 in side view, but this is not limiting, and the tube connection cylinder portion 31a and the extension line 100 of the cannula 2 do not have to be perpendicular to each other in side view. Also, in this embodiment, the tube connection cylinder portion 31a protrudes in a direction perpendicular to the extension line 100 of the cannula 2 in plan view (when viewed along the direction of the extension line 100 of the cannula 2), but this is not limiting, and the tube connection cylinder portion 31a and the extension line 100 of the cannula 2 do not have to be perpendicular to each other in plan view either.

[0031] A cannula connection tube 31b, to which the base end of the cannula 2 is connected, is provided on the main body 31 so as to protrude in the direction of the extension line 100 of the cannula 2. The base end of the cannula 2 is inserted into the cannula connection tube 31b and liquid-tightly connected, for example, by adhesive. Since the main body 31 is an integrally molded product, the cannula connection tube 31b is a part of the main body 31. Alternatively, the main body 31 and the cannula connection tube 31b may be formed as separate members, and the cannula connection tube 31b may be attached to the main body 31.

[0032] In this embodiment, the cannula connection tube portion 31b is arranged so that the center line of the cannula connection tube portion 31b is positioned coaxially with the extension line 100 of the cannula 2, but this is not limited to this, and when viewed along the direction of the extension line 100, the center line of the cannula connection tube portion 31b and the extension line 100 of the cannula 2 may be radially offset.

[0033] The outer peripheral surface of the cannula connecting tube portion 31b is provided with a base-end protrusion 31c formed at its base end and an intermediate protrusion 31d formed away from the base-end protrusion 31c toward the tip end. The base-end protrusion 31c has a flange shape that protrudes radially from the outer peripheral surface of the cannula connecting tube portion 31b and extends circumferentially. The intermediate protrusion 31d also has a flange shape that protrudes radially from the outer peripheral surface of the cannula connecting tube portion 31b and extends circumferentially. The distance between the base-end protrusion 31c and the intermediate protrusion 31d is set to be approximately the same as the thickness of the central portion of the holding portion 6, which will be described later. The outer diameter of the base-end protrusion 31c is set to be larger than the outer diameter of the intermediate protrusion 31d.

[0034] The side of the main body 31 opposite the cannula connection cylindrical portion 31b is open. A valve element 32 is accommodated on the side of the main body 31 opposite the cannula connection cylindrical portion 31b. The valve element 32 is made of an elastically deformable material such as rubber, and is disk-shaped and in contact with the inner circumferential surface of the main body 31 over its entire circumference. The center of the valve element 32 is positioned on an extension line 100 of the cannula 2. In other words, the valve element 32 is disposed on the extension line 100 of the cannula 2 in the hub 3.

[0035] As shown in Figure 4, the puncture needle 4 is inserted into the valve body 32, and the puncture needle 4 that has been inserted into the valve body 32 is inserted into the cannula 2 via the valve body 32. The puncture needle 4 is positioned so that it protrudes from the opening at the tip of the cannula 2 when inserted into the cannula 2. The part of the puncture needle 4 that protrudes from the tip of the cannula 2 has a sharpened shape. In addition, the base end of the puncture needle 4 is provided with a grip part 4a that can be held by a medical professional.

[0036] For example, the puncture needle 4 can be inserted into the cannula 2 by inserting the puncture needle 4 so as to penetrate the center of the valve body 32. In this inserted state, the valve body 32 elastically deforms to fit the shape of the outer surface of the puncture needle 4, thereby preventing fluid leakage from between the valve body 32 and the outer surface of the puncture needle 4. Furthermore, when the puncture needle 4 is removed, the shape of the valve body 32 returns to its original state so as to close the mark left by the puncture needle 4. This prevents fluid leakage from the valve body 32 even after the puncture needle 4 is removed. The configuration of the valve body 32 is not limited to the above-described configuration, and any conventionally known valve structure can be used.

[0037] The cover 33 is a member that covers the open portion of the main body 31 to prevent the valve body 32 housed in the main body 31 from falling off. As shown in Figures 1 and 2, a through-hole 33a is formed in the center of the cover 33. The through-hole 33a coincides with the center of the valve body 32, and when the puncture needle 4 is inserted into the through-hole 33a, it can puncture the center of the valve body 32. The peripheral edge of the cover 33 is fixed to the peripheral edge of the open portion of the main body 31, and the cover 33 and the main body 31 are integrated together.

[0038] The waste liquid tube 5 is made of a soft tube connected to the hub 3. Examples of the resin material that makes up the waste liquid tube 5 include vinyl chloride, polybutadiene, polyurethane, etc., and the waste liquid tube 5 is made of a material that is softer than the main body 31 of the hub 3. The diameter of the waste liquid tube 5 is set to be larger than the diameter of the cannula 2. Furthermore, the length of the waste liquid tube 5 may be approximately the same as the length of the cannula 2 or may be longer than the length of the cannula 2, and is not particularly limited.

[0039] A cylindrical connector member 51 made of a hard resin material is connected to the downstream portion of the waste fluid tube 5. The connector member 51 is adapted to be connected to a tube extending from a bag (not shown) that stores the drained ascites.

[0040] The holding portion 6 is made of a harder material than the drainage tube 5 and is used to hold the cannula 2 in a position approximately perpendicular to the puncture site of the patient. When using the cannula 2 to drain ascites from the abdominal cavity, it is preferable to hold the cannula 2 approximately perpendicular to the puncture site of the patient from the perspective of drainage efficiency. Although the puncture site is a surface with a small area, the surface constituting this puncture site can be considered to be approximately a plane. The direction perpendicular to this plane is the vertical direction, and it is preferable to hold the cannula 2 in this position. Note that the cannula 2 does not have to be strictly perpendicular to the puncture site of the patient; for example, the cannula 2 may be held at an angle of 80 degrees or less relative to the puncture site of the patient. In other words, any angle of inclination that does not substantially reduce the drainage efficiency of ascites from the abdominal cavity is considered to be "approximately perpendicular."

[0041] Examples of resin materials that may be used for the holding portion 6 include thermoplastic elastomer and rubber. The holding portion 6 is fixed to the cannula connecting tube portion 31b of the hub 3. Specifically, as shown in FIG. 2, the holding portion 6 has a plate shape that is long in a predetermined direction. An insertion hole 60 into which the cannula connecting tube portion 31b is inserted is formed in the middle of the holding portion 6 in the longitudinal direction. The insertion hole 60 has a substantially circular shape and substantially matches the outer shape of the portion of the cannula connecting tube portion 31b between the base-end protrusion 31c and the intermediate protrusion 31d. The diameter of the insertion hole 60 is set smaller than the outer diameter of the base-end protrusion 31c and the intermediate protrusion 31d, and substantially matches the outer diameter of the portion of the cannula connecting tube portion 31b between the base-end protrusion 31c and the intermediate protrusion 31d. Furthermore, the thickness of the portion of the holding portion 6 where the insertion hole 60 is formed, i.e., the central portion 6a, is set to be thicker than the thickness of one side portion 6b on one longitudinal side of the central portion 6a of the holding portion 6 and the other side portion 6b on the other longitudinal side of the central portion 6a of the holding portion 6. When the holding portion 6 is fixed to the cannula connecting tube portion 31b, the cannula connecting tube portion 31b is pushed from its distal end side into the insertion hole 60 of the holding portion 6, and the cannula connecting tube portion 31b is pushed in until the central portion 6a of the holding portion 6 clears the intermediate protrusion 31d while elastically deforming the intermediate protrusion 31d and the area around the insertion hole 60 of the holding portion 6. When the central portion 6a of the holding portion 6 clears the intermediate protrusion 31d and is positioned between the base-end protrusion 31c and the intermediate protrusion 31d, the central portion 6a of the holding portion 6 is sandwiched between the base-end protrusion 31c and the intermediate protrusion 31d in the thickness direction. As a result, the holding part 6 is fixed with the cannula connection tube part 31b fitted into the fitting hole 60, and is integrated so as not to easily come off from the hub 3. The holding part 6 and the hub 3 may be bonded together, or the holding part 6 and the hub 3 may be integrally molded from a resin material.

[0042] The one side portion 6b and the other side portion 6b of the holding portion 6 are patient-side fixed portions that are fixed to the patient. In this embodiment, both the one side portion 6b and the other side portion 6b are patient-side fixed portions, but only one of them may be a patient-side fixed portion. When fixing the one side portion 6b and the other side portion 6b to the patient, for example, adhesive tape (not shown) that has traditionally been used in the medical field can be used, and the one side portion 6b and the other side portion 6b are attached and fixed to the patient's skin using this adhesive tape. The method of fixing the one side portion 6b and the other side portion 6b is not limited to the method of fixing using adhesive tape.

[0043] One side portion 6b has a plurality of openings 6d spaced apart from one another in the longitudinal direction of the holding portion 6. Similarly, the other side portion 6b has a plurality of openings 6e. The openings 6d and 6e may be omitted.

[0044] One side 6b and the other side 6b of the holding portion 6 are configured to be bendable toward the tip of the cannula 2. Figure 5 shows the case where one side 6b and the other side 6b of the holding portion 6 are flat. In Figure 5, the cannula 2 can be inserted to the deepest point.

[0045] 7 shows a state in which one side portion 6b and the other side portion 6b of the holding portion 6 are bent toward the distal end of the cannula 2. By bending the vicinity of the central portion 6a of the one side portion 6b and the other side portion 6b, the central portion 6a is positioned closer to the proximal end of the cannula 2 (the direction opposite to the puncture direction) than the one side portion 6b and the other side portion 6b. This results in a shallower puncture depth of the cannula 2 compared to the case shown in FIG. 5. Furthermore, in the cases shown in FIGS. 5 and 7, most of the one side portion 6b and the other side portion 6b extend along the patient's skin, thereby increasing the range over which the cannula can be fixed to the patient.

[0046] 8 and 9 show a state in which one side portion 6b and the other side portion 6b of the holding portion 6 are bent toward the tip of the cannula 2, and the central portion 6a is further away in the anti-puncture direction than the tip of the one side portion 6b and the tip of the other side portion 6b compared to the case shown in Fig. 7. Therefore, the puncture depth of the cannula 2 is shallower than in the case shown in Fig. 7. The puncture depth of the cannula 2 can be set almost continuously by changing the shape of the one side portion 6b and the other side portion 6b.

[0047] In the case shown in Figures 8 and 9, the tip of one side portion 6b and the tip of the other side portion 6b extend along the patient's skin, and these portions can be fixed with adhesive tape. In the case shown in Figures 8 and 9, the area that can be fixed to the patient is narrower than in the case shown in Figures 5 and 7, but at least two fixing points can be secured, so there is no problem with stability. In this way, by deforming one side portion 6b and the other side portion 6b, the distance in the puncture direction between the tip of one side portion 6b and the tip of the other side portion 6b and the central portion 6a can be changed.

[0048] That is, the one side portion 6b and the other side portion 6b of the holding portion 6 can be deformed into any of the shapes shown in FIG. 5, FIG. 7, and FIG. 8. The one side portion 6b and the other side portion 6b of the holding portion 6 have shape retention properties that allow them to maintain their shape after deformation. Such shape retention properties are possible by using the resin material described above. Furthermore, for example, embedding a metal plate and plastically deforming the metal plate can also maintain the one side portion 6b and the other side portion 6b of the holding portion 6 in their deformed shapes.

[0049] (How to use drainage device 1) When using the drainage device 1, first, the puncture needle 4 is inserted into the cannula 2 as shown in Figure 4. Furthermore, since it is expected that there will be a large amount of ascites in the initial stage of draining the ascites, one side 6b and the other side 6b of the holding part 6 are made nearly flat so that the cannula 2 can be inserted deeply, as shown in Figure 5. Thereafter, the puncture needle 4 and the cannula 2 are inserted into the patient's abdomen, and when the tip of the cannula 2 reaches the desired depth, the puncture is stopped and the puncture needle 4 is removed from the cannula 2. After removal, the valve body 32 closes the hub 32, preventing leakage of fluid.

[0050] After the cannula 2 is positioned approximately perpendicular to the puncture site, the one side 6b and the other side 6b of the holding part 6 are fixed to the patient's skin. This prevents the cannula 2 from falling over, improving drainage efficiency. Ascites in the abdominal cavity flows through the flow path in the cannula 2, reaches the main body 31 of the hub 3, and is then drained from the drainage tube 5.

[0051] When the amount of ascites in the abdominal cavity decreases, the cannula 2 is slightly removed to decrease the puncture depth. At this time, the one side 6b and the other side 6b of the holding part 6 are bent to correspond to the puncture depth as shown in FIG. 7, or the one side 6b and the other side 6b of the holding part 6 are bent as shown in FIG. 8, and then the one side 6b and the other side 6b are fixed to the patient's skin. This allows the cannula 2 to be held in a position approximately perpendicular to the puncture site, even if the puncture depth of the cannula 2 becomes shallow. The drainage device 1 can be used to drain pleural effusion as well as ascites.

[0052] (Effects of the embodiment) As described above, according to this embodiment, when the one side portion 6b and the other side portion 6b of the holding portion 6 are fixed to the patient, the cannula 2 is held in a position approximately perpendicular to the puncture site, thereby improving drainage efficiency. At this time, because the holding portion 6 is fixed to the hub 3 in advance, there is no need to fix the holding portion 6 to the hub 3 on-site, and relative positional deviation between the holding portion 6 and the hub 3 is suppressed. Furthermore, because the holding portion 6 is made of a material harder than the waste fluid tube 5, the holding portion 6 itself is less likely to deform, and the cannula 2 is prevented from losing its position.

[0053] Furthermore, since one side portion 6b and the other side portion 6b of the holding portion 6 are configured to be bendable, even if the puncture depth of the cannula 2 is changed depending on the amount of ascites, the cannula 2 can be held in a position approximately perpendicular to the puncture site.

[0054] (Embodiment 2) 10 and 11 show a drainage device 1 according to a second embodiment of the present invention. The drainage device 1 of the second embodiment differs from that of the first embodiment in that the shape of the holding section 6 cannot be changed by the user, and other parts are the same as those of the first embodiment. Therefore, hereinafter, the same parts as those of the first embodiment will be assigned the same reference numerals and their description will be omitted, and only the different parts will be described in detail.

[0055] In this embodiment 2, the shape of the holding portion 6 is predetermined, and the user cannot bend the holding portion 6. In this embodiment 2 as well, by fixing one side portion 6b and the other side portion 6b of the holding portion 6 to the patient's skin, the cannula 2 can be positioned approximately perpendicular to the puncture site. Therefore, the same effects as those of embodiment 1 can be achieved.

[0056] (Embodiment 3) 12 shows a drainage device 1 according to a third embodiment of the present invention. The drainage device 1 of the third embodiment differs from that of the first embodiment in that the shape of the holding section 6 cannot be changed by the user and in that the shape of the hub 3 is different. Other parts are the same as those of the first embodiment. Therefore, hereinafter, the same parts as those of the first embodiment will be assigned the same reference numerals and their description will be omitted, and only the different parts will be described in detail.

[0057] In this embodiment 3, a holding portion 6 similar to that of embodiment 2 is provided. The hub 3 is formed in a cylindrical shape and extends overall in the direction of the center line of the cannula connection cylindrical portion 31b to which the cannula 2 is connected. An insertion hole 3f into which the puncture needle 4 is inserted is formed at the end of the hub 3 opposite the cannula connection cylindrical portion 31b. After puncturing and removing the puncture needle 4, a waste fluid tube (not shown) similar to that of embodiment 1 can be connected to the insertion hole 3f via a connector member (not shown). The connector member has a conventionally known luer taper, so that liquid leakage does not occur.

[0058] In the case of this embodiment 3 as well, by fixing one side portion 6b and the other side portion 6b of the holding portion 6 to the patient's skin, the cannula 2 can be positioned approximately perpendicular to the puncture site, thereby achieving the same effects as those of embodiment 1.

[0059] The above-described embodiments are merely examples in all respects and should not be construed as limiting. Furthermore, all modifications and variations within the scope of the claims are within the scope of the present invention.

[0060] For example, it is possible to fold the holding part 6 so that the tip of the puncture needle 4 reaches the ascites or pleural fluid, and then insert the puncture needle 4 into the patient. This makes it possible to arbitrarily change the puncture depth of the cannula 2 using the holding part 6.

[0061] 13, the positional relationship between the holding part 6 and the hub 3 is preferably such that one side 6b and the other side 6c of the holding part 6 are flush with the underside of the hub 3 or are fixed at a portion closer to the tip of the puncture needle 4 than the underside of the hub 3. After puncturing, the holding part 6 can be deformed as needed, or the holding part 6 can be used without being deformed.

[0062] Furthermore, the holding part 6 can be rotated. By rotating the holding part 6, the cannula 2 can be fixed to the abdominal wall at any angle at which it is difficult for the cannula 2 to come out. [Industrial Applicability]

[0063] As described above, the drainage device according to the present invention can be used to drain ascites accumulated in the abdominal cavity or pleural effusion accumulated in the thoracic cavity. [Explanation of symbols]

[0064] 1 Drainage equipment 2 cannulas 3. Hub 4 Puncture needle 5 Waste tube 6 Holding part 6b One side (patient side fixing part) 6c Other side (patient side fixing part) 31a Tube connection tube 31b Cannula connection tube 32 Valve body 60 Insertion hole

Claims

1. A drainage device for draining ascites accumulated in the abdominal cavity or pleural effusion accumulated in the chest, a cannula whose tip is placed in the abdominal cavity or the thoracic cavity; a hub connected to the proximal end of the cannula; a puncture needle that is inserted into the cannula through the hub and that is positioned so as to protrude from the distal end of the cannula in an inserted state; a waste liquid tube made of a soft tube connected to the hub; a holding portion that holds the cannula in a position substantially perpendicular to the puncture site of the patient; a cannula connecting tube portion to which a base end of the cannula is connected is provided on the hub so as to protrude in the direction of extension of the cannula; The holding portion has a plate shape that is long in a predetermined direction, a fitting hole into which the cannula connecting tube portion is fitted is formed in a longitudinally intermediate portion of the holding portion; the holding portion is attached to the cannula connecting cylindrical portion with the cannula connecting cylindrical portion fitted into the fitting hole, and has a patient-side fixing portion that is fixed to a patient, The drainage device is characterized in that the holding portion is configured to be bendable on one and the other longitudinal sides of the portion where the insertion hole is formed toward the tip of the cannula.

2. The drainage device according to claim 1, The hub has a valve body, The drainage device is characterized in that the puncture needle is inserted into the cannula through the valve body.

3. The drainage device according to claim 2, The drainage device is characterized in that the holding portion is made of a material harder than the cannula.

4. The drainage device according to claim 2 or 3, The drainage device is characterized in that the valve body is disposed on the hub in an extension of the cannula.

5. The drainage device according to claim 4, The drainage device is characterized in that the hub is provided with a tube connection cylindrical portion to which the upstream portion of the waste liquid tube is connected, the tube connection cylindrical portion protruding in a direction intersecting with an extension line of the cannula.

6. The drainage device according to claim 1, A drainage device comprising the patient-side fixing parts on one and the other longitudinal sides of the part of the holding part where the insertion hole is formed.

7. 7. The drainage device according to claim 1, The drainage device is characterized in that the cannula is provided with a scale indicating the depth of insertion into the body.

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