WO2023085343A1 - Filtre de chambre compte-gouttes - Google Patents

Filtre de chambre compte-gouttes Download PDF

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Publication number
WO2023085343A1
WO2023085343A1 PCT/JP2022/041840 JP2022041840W WO2023085343A1 WO 2023085343 A1 WO2023085343 A1 WO 2023085343A1 JP 2022041840 W JP2022041840 W JP 2022041840W WO 2023085343 A1 WO2023085343 A1 WO 2023085343A1
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WIPO (PCT)
Prior art keywords
top plate
filter
plate portion
drip chamber
lower ring
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PCT/JP2022/041840
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English (en)
Japanese (ja)
Inventor
慎吾 阪本
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ニプロ株式会社
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Application filed by ニプロ株式会社 filed Critical ニプロ株式会社
Publication of WO2023085343A1 publication Critical patent/WO2023085343A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M1/00—Suction or pumping devices for medical purposes; Devices for carrying-off, for treatment of, or for carrying-over, body-liquids; Drainage systems
    • A61M1/36—Other treatment of blood in a by-pass of the natural circulatory system, e.g. temperature adaptation, irradiation ; Extra-corporeal blood circuits

Definitions

  • the present disclosure relates to filters for drip chambers.
  • a filter is installed in the drip chamber of the extracorporeal circulation circuit to remove clots and foreign substances in the blood. Mold filters and mesh filters are mainly used as filters for drip chambers.
  • Both the mold filter and the mesh filter are required to have the function of properly removing foreign substances, as well as the smooth flow of blood and the ability to easily remove air bubbles during priming. If the blood does not flow smoothly and stagnation occurs, blood coagulation is likely to occur in that part. In addition, if the detachability of air bubbles is poor, the operability during priming is deteriorated. If the device is used while air bubbles remain, it may cause poor blood flow or coagulation.
  • An object of the present disclosure is to realize a filter for a drip chamber in which blood flows smoothly and is less likely to stagnate.
  • a first aspect of the drip chamber filter of the present disclosure includes a top plate portion, a lower ring, a plurality of ribs connecting the top plate portion and the lower ring and forming a plurality of slits therebetween, and An intermediate ring connecting the ribs to each other is provided, and the ribs have a triangular inner circumference whose circumferential width is smaller toward the radially inner side, and the angle formed by the outer circumference and the radial direction with the extending direction of the side surface is larger than that of the outer circumference. and the radial thickness of the intermediate ring is less than the radial thickness of the rib at the position where the intermediate ring is formed.
  • the radial thickness of the intermediate ring is thinner than the radial thickness of the ribs at the position where the intermediate ring is formed, so that the accumulation-prone area hidden under the intermediate ring becomes smaller. Therefore, it is possible to prevent blood from stagnation due to the intermediate ring.
  • the inner peripheral portion of the rib has a triangular shape in which the angle formed by the extending direction of the side surface and the radial direction is larger than that of the outer peripheral portion, the width of the slit is widened in the inner peripheral portion of the rib. For this reason, the blood can flow smoothly in the slit, and stagnation can be prevented.
  • a second aspect of the drip chamber filter comprises a top plate portion, a lower ring, and a plurality of ribs connecting the top plate portion and the lower ring and forming a plurality of slits therebetween, the top plate
  • the portion has an inclined lower surface that becomes lower toward the center, and a top surface opening that penetrates vertically.
  • the downward blood flow is more likely to occur along the inclined lower surface of the top plate, and thus the lower surface of the top plate is more likely to flow vertically than the lower surface of the top plate is perpendicular to the blood flow. Therefore, retention can be made difficult to occur.
  • the inflow of blood from the opening of the top plate also causes a downward flow, so that stagnation can be reduced on the entire lower surface of the top plate portion.
  • the top plate portion may have an inclined upper surface that slopes downward toward the center. With such a configuration, blood can be easily guided to the opening of the top plate.
  • the top plate opening may be formed along the radial direction and may have a shape in which the length in the radial direction is longer than the width in the circumferential direction.
  • a third aspect of the drip chamber filter comprises a top plate portion, a lower ring, and a plurality of ribs connecting the top plate portion and the lower ring and forming a plurality of slits therebetween, wherein the ribs
  • the lower end portion has an inclined region in which the thickness in the radial direction gradually decreases downward so as to form a space on the side.
  • the rib has an inclined region in which the thickness in the radial direction gradually decreases downward, so that the lower end surface of the rib is perpendicular to the blood flow. It does not become a rough surface, and it is possible to make it difficult for retention to occur.
  • the connecting portion between the lower end portion of the filter and the chamber main body does not form a stepped portion, so that it is possible to further prevent accumulation.
  • a third aspect of the drip chamber filter further comprises an intermediate ring formed between the top plate portion and the lower ring, and the outer peripheral surface of the rib protrudes radially outward at a position intersecting the intermediate ring. It can have a stepped portion. With such a configuration, deformation of the ribs is suppressed, and the width of the slits in the circumferential direction can be easily uniformed, so that the function of preventing blood clots and the like can be improved.
  • a fourth aspect of the drip chamber filter of the present disclosure includes a mesh filter and a filter holding portion that holds the mesh filter in a cylindrical shape, and the filter holding portion includes a top plate portion, a lower ring, and a top plate portion. and a pillar portion connecting the lower ring, the top plate portion has the highest position of the lower surface at the outer edge, and has a top plate opening that penetrates vertically, and the top plate opening is higher at the lower end than at the upper end
  • the minimum gap width is small, and the inner surface of the mesh filter is tightly fixed to the outer surface of the filter holder.
  • the bottom surface of the top plate portion is the highest at the outer edge, so that the upper end of the filter does not have an upwardly convex depression that causes blood to stagnate. , can suppress retention.
  • the top plate portion has a top plate opening penetrating vertically, and the top plate opening has a minimum gap width smaller at the lower end than at the upper end. Therefore, the ability to prevent the passage of clots and foreign substances is high, and air bubbles are easily removed during priming.
  • the inner surface of the mesh filter is tightly fixed to the outer surface of the filter holding part, it is easy to attach the mesh filter to the filter holding part, and the mesh filter is less likely to deform, allowing blood to pass through smoothly. can be made
  • a plurality of top plate openings are formed on the periphery surrounding the center of the top plate portion, the hole wall on the outer edge side is a vertical surface, and the hole wall on the center side is a vertical surface.
  • the inclined surface can be inclined so as to approach the hole wall on the outer edge side toward the lower side.
  • the top plate portion may have a lower convex portion that protrudes from the position of the top plate opening toward the center of the top plate portion on the bottom surface and has a projection height that gradually increases.
  • the outer diameter of the lower ring may match the outer diameter of the top plate.
  • the flange has a flange projecting radially outward from the lower ring, the flange has a notch on the outer peripheral surface, and the notch is in circumferential position with respect to the pillar. may be provided to match.
  • FIG. 1 is a cross-sectional view showing a drip chamber according to a first embodiment; FIG. It is a side view which shows the filter which concerns on 1st Embodiment. It is a top view showing a filter concerning a 1st embodiment.
  • 1 is a cross-sectional view showing a filter according to a first embodiment; FIG. It is sectional drawing which expands and shows a rib.
  • FIG. 4 is a cross-sectional view taken along line VI-VI of FIG. 3; It is sectional drawing which expands and shows the fitting part of a filter and a chamber main body. It is sectional drawing which expands and shows a top-plate opening part.
  • FIG. 4 is a cross-sectional view taken along line VI-VI of FIG. 3; It is sectional drawing which expands and shows the fitting part of a filter and a chamber main body. It is sectional drawing which expands and shows a top-plate opening part.
  • FIG. 5 is a cross-sectional view showing a drip chamber according to a second embodiment; It is a perspective view showing a filter according to a second embodiment. It is a perspective view which shows the filter holding
  • 12 is a cross-sectional view taken along line XII-XII of FIG. 11;
  • FIG. 12 is a cross-sectional view taken along line XIII-XIII of FIG. 11;
  • FIG. 12 is a cross-sectional view taken along line XIV-XIV in FIG. 11;
  • the drip chamber has a chamber main body 200 and a filter 10 housed therein.
  • the chamber body 200 has a tubular portion 201 and an upper cap 203 attached to the upper portion of the tubular portion 201 .
  • the top cap 203 has multiple ports 231 to which the tubes 301 are connected.
  • the number and arrangement of ports 231 provided in the top cap 203 are not particularly limited.
  • the port 231 can also be provided on the side surface of the upper cap 203 or the side surface of the tubular portion 201 .
  • a lower end portion of the cylindrical portion 201 is tapered downward, and a tube 302 is connected to the lower end.
  • the filter 10 is fitted inside the lower end portion of the tubular portion 201 .
  • the chamber main body is formed of two members, the upper cap and the cylindrical portion, has been shown, it may be configured to be formed of more members.
  • the filter 10 is a molded filter and has a top plate portion 11, a lower ring 12 and a plurality of ribs 13.
  • the ribs 13 connect the top plate portion 11 and the lower ring 12, and slits 15, which are openings, are formed between adjacent ribs 13. As shown in FIG.
  • the slit 15 is divided into three parts in the height direction by the intermediate ring 14 . Since each part divided in the height direction of the slit 15 has a vertically long shape whose height is sufficiently larger than the width in the circumferential direction, the direction in which the vertically long slit 15 extends is perpendicular to the direction in which the blood and the priming solution flow. do not. Since the air bubbles trapped in the slit 15 are pushed by the flow of the liquid and move vertically in the slit 15, the air bubbles easily pass through the slit 15, and the detachability of the air bubbles is improved.
  • the number of intermediate rings 14 may be appropriately selected according to the height of the filter 10 and the like, and may be one or three or more. However, from the viewpoint of making it difficult for air bubbles to stay, the length in the height direction of one slit 15 divided in the height direction by the intermediate ring 14 is preferably 10% or more of the height of the filter 10, or more. Preferably it is 20% or more. Note that the intermediate ring 14 may not be provided if deformation of the rib 13 can be sufficiently prevented.
  • each rib 13 has a columnar shape having an outer circumferential surface extending in the circumferential direction and side surfaces extending radially inward, and having a circumferential width that decreases radially inward.
  • the cross-sectional shape of the rib 13 is a substantially pentagonal shape in which a substantially isosceles trapezoidal outer peripheral portion 13a and a substantially triangular inner peripheral portion 13b are combined.
  • the angle ⁇ 2 formed by the extending direction of the side surfaces of the inner peripheral portion 13b with the radial direction is larger than the angle ⁇ 1 formed between the extending direction of the side surfaces of the outer peripheral portion 13a and the radial direction.
  • the circumferential width of the slit 15 formed between the ribs 13 is longer on the radially inner side than on the radially outer side.
  • the circumferential width of the slit 15 is substantially constant at the outer peripheral portion or slightly decreases toward the radially inner side, and increases toward the radially inner side at the inner peripheral portion 13b. ing.
  • the width of the slit 15 in the circumferential direction is appropriately determined according to the required characteristics. It can be about 2.0 mm.
  • the number of ribs 13 can be appropriately selected in consideration of the slit width and the diameter of filter 10 .
  • the cross-sectional shape of the rib 13 is formed by combining the substantially isosceles trapezoidal outer peripheral portion 13a and the substantially triangular inner peripheral portion 13b.
  • This shape has higher strength than triangular ribs and can be less likely to deform.
  • there is a portion with a constant slit width so that foreign matter blocking function can be enhanced.
  • the slit width can be increased on the inner side in the radial direction as compared with ribs having a substantially isosceles trapezoidal cross section, blood can easily flow and stagnation can be prevented.
  • the angle formed by the outer peripheral surface of the rib and the side surface is larger than that of the rib having a substantially triangular cross-section, damage to blood cells by the edge is less likely to occur.
  • the inner end of the inner peripheral portion 13b can be formed in a slightly curved shape.
  • the intermediate ring 14 becomes a large barrier for blood flowing downward from above. For this reason, a pocket in which the flow is stagnated is likely to occur on the lower side of the intermediate ring 14 .
  • the width of the slit 15 gradually increases toward the center, if the intermediate ring 14 exists over the entire radial direction of the rib 13, the portion where the intermediate ring 14 fills the slit 15 becomes larger, further increasing the retention. more likely to occur.
  • the radial thickness of the intermediate ring 14 is thinner than the radial thickness of the rib 13 at the position where the intermediate ring 14 is formed, and the intermediate ring 14 is not present on the inner peripheral portion 13b, and the outer peripheral portion 13a. There is an intermediate ring at the outer edge only.
  • the intermediate ring 14 connects the portion of the outer peripheral portion 13 b having a narrow circumferential width of the slit 15 , the portion where the intermediate ring 14 fills the slit 15 is smaller than the intermediate ring connecting the entire radial width of the rib 13 . can be reduced, it is possible to make retention less likely to occur.
  • the outer peripheral surface of the rib 13 has a step at the position where the intermediate ring 14 is formed.
  • the inner peripheral surface of the rib 13 does not have a step even at the position where the intermediate ring 14 is formed.
  • the ribs 13 are not stepped and connected flatly, so that the blood flows smoothly and is less likely to stagnate.
  • the detachability of air bubbles is also improved.
  • the strength of the filter 10 can be easily increased by providing a step on the outer peripheral surface of the rib 13, the step need not be formed. Further, it is also possible to adopt a configuration in which a slight level difference is generated inside the rib 13 .
  • the rib 13 of this embodiment has an inclined region 18 at its lower end where the thickness in the radial direction gradually decreases toward the lower end of the lower ring 12 and the thickness in the radial direction becomes substantially zero near the lower end of the lower ring 12 . .
  • the formation of the sloped regions 18 creates spaces 19 below the ribs 13 .
  • the filter 10 is fixed to the chamber main body 200 by inserting the lower ring 12 into the groove 201a formed in the tubular portion 201 . For this reason, the inclined surface forming the inclined region 18 is smoothly connected to the inner wall surface of the chamber main body almost without steps.
  • the lower end surface of the rib 13 becomes a surface substantially perpendicular to the direction of flow, and a step occurs at the lower end of the rib 13 .
  • the lower end of the rib 13 is aligned with the lower end of the lower ring 12 and the lower surface of the groove portion 201a is widened to the inner peripheral end of the rib 13, there is no step at the lower end of the rib 13, but the lower end of the slit 15 is closed. It will come off and cause a step. Any step causes blood to stagnate. However, as shown in FIG.
  • the ribs 13 of the present embodiment can prevent a step from being generated at the lower end of the ribs 13, thereby suppressing the occurrence of stagnation.
  • the upper end of the inclined region 18 is aligned with the upper end of the lower ring 12 in this embodiment, it does not have to be aligned.
  • the position where the radial thickness of the lower ring 12 becomes 0 does not have to be completely aligned with the lower end of the lower ring 12 .
  • the radial thickness of the ribs 13 may not be completely zero.
  • the inner peripheral surface of the lower ring 12 preferably matches the outer peripheral surface of the rib 13 and is connected without steps. By doing so, the lower end of the slit 15 is not blocked by the upper surface of the lower ring 12, so that it is possible to prevent accumulation.
  • a notch 16 is formed in the outer peripheral surface of the lower ring 12 .
  • the notch 16 corresponds to a gate portion for injecting resin at the time of molding.
  • the top plate portion 11 has a lower surface 22 that slopes downward toward the center. Air bubbles moving upward inside the filter 10 and reaching the top plate portion 11 are guided radially outward by the lower surface 22 of the top plate portion 11 which is an inclined surface that gradually rises from the center toward the outer edge.
  • the slit 15 extends to the bottom surface 22 of the top plate portion 11 . Therefore, air bubbles reaching the outer edge of the top plate portion 11 are easily discharged from the slit 15 to the outside of the filter. Also, during use, the blood that has flowed into the filter 10 from the upper end of the slit 15 flows downward along the slanted lower surface 22, so that the blood flows smoothly under the top plate portion 11. can be made less likely to occur.
  • the height difference h1 between the center and the outer edge of the lower surface 22 of the top plate portion 11 is not particularly limited, it is preferably about 1.6 mm from the viewpoint of improving air bubble removal.
  • the lower surface 22 of the top plate portion 11 is not limited to an inclined surface, and may be a horizontal surface with no height difference.
  • the upper surface 21 of the top plate portion 11 also has a shape with a depressed central portion, and at least a portion of the upper surface 21 is an inclined upper surface.
  • the thickness of the top plate portion 11 can be made substantially constant from the central portion to the outer edge portion. By making the thickness of the top plate portion 11 substantially constant, sink marks are less likely to occur during injection molding, and the molding accuracy is improved. function can be realized.
  • the injection pressure during injection molding can be reduced. When the injection pressure becomes high, burrs are likely to occur in the thin rib 13 portion, and the burrs on the rib 13 cause hemolysis.
  • the inclination of the upper surface 21 of the top plate portion does not have to match the inclination of the lower surface 22 .
  • the upper surface 21 can be a horizontal surface without a height difference.
  • the top plate portion 11 is formed with a top plate opening portion 17 penetrating vertically. At the time of priming, air bubbles are also discharged from the top plate opening 17 to the outside of the filter. During use, blood flows into the filter 10 not only through the slit 15 but also through the opening 17 of the top plate. As a result, a downward flow is generated under the top plate portion 11, so that retention on the bottom side of the top plate portion 11 can be reduced.
  • the top plate opening 17 of the present embodiment is formed along the radial direction and has a substantially rectangular shape with a radial length longer than a circumferential width. By adopting such a shape, it is possible to make the downward flow more likely to occur.
  • the shape of the opening surface of the top plate opening 17 is not limited to a substantially rectangular shape, and may be a substantially triangular shape, a substantially elliptical shape, or the like whose radial length is longer than the maximum value of the circumferential width.
  • top plate openings 17 are formed radially from the center of the top plate portion 11 .
  • the number of top panel openings 17 may be one, two, or four or more, and the top panel openings 17 may be formed not only radially but also along the circumferential direction.
  • the top plate opening 17 is formed so as to gradually widen from the lower end to the upper end, and the radially outer hole wall 17b is steeper than the radially inner hole wall 17a. It has a vertical surface. With such a shape, it is possible to prevent the passage of blood clots and the like while allowing air bubbles to escape easily. Moreover, formation of the top plate opening 17 is facilitated.
  • the inclination of the radially inner hole wall 17a and the radially outer hole wall 17b may be the same, and the angle of inclination is not particularly limited. Further, at least one of the radially inner hole wall 17a and the radially outer hole wall 17b may not be inclined.
  • the outer edge of the upper surface 21 of the top plate portion 11 is chamfered.
  • the depression formed in the central portion is also formed gently.
  • the upper end of the hole wall of the top plate opening 17 is chamfered. Therefore, the upper surface of the top plate portion 11 does not have sharp corners, and the occurrence of hemolysis due to the corners can be suppressed.
  • the filter 10 of this embodiment is not particularly limited, it can be formed by injection molding polypropylene, polyethylene, or the like. Any mold may be used for molding, but by performing injection molding using a mold having a plurality of gates on the lower ring 12 side, a mold having a gate at the center of the top plate portion 11 is formed. Injection pressure can be made smaller than when it is used. As a result, it is possible to reduce the occurrence of burrs particularly on the ribs 13 .
  • FIG. 9 shows a drip chamber according to the second embodiment.
  • the drip chamber according to the second embodiment has a chamber body 200 and a filter 100 housed therein.
  • the chamber body 200 has a tubular portion 205, an upper cap 203 attached to the upper portion of the tubular portion 205, and a lower cap 206 attached to the lower portion.
  • the top cap 203 has multiple ports 231 to which tubes are connected. The number and arrangement of ports 231 provided in the top cap 203 are not particularly limited. The port 231 can also be provided on the side of the top cap 203 .
  • the lower cap 206 is tapered downward and has a tube 302 connected to its lower end.
  • the filter 100 is fitted inside the lower cap 206 . Note that the configuration of the chamber main body 200 is not limited to this.
  • the filter 100 has a filter holding portion 101 and a mesh filter 102 held by the filter holding portion 101.
  • the mesh filter 102 is formed in a cylindrical shape surrounding the filter holding portion 101 , and the inner surface of the mesh filter 102 is tightly fixed to the outer surface of the filter holding portion 101 .
  • the filter holding portion 101 has a top plate portion 111, a lower ring 113, and a pillar 112 connecting the top plate portion 111 and the lower ring 113.
  • two pillars 112 are provided at positions facing each other across the center of the filter holding portion 101 . Therefore, the positions of top plate portion 111 and lower ring 113 can be firmly fixed, and the shape of filter 100 can be stabilized.
  • the number of pillars 112 may be one, or three or more.
  • the pillars 112 do not protrude radially outward from the top plate portion 111 and the lower ring 113, and the outer surfaces of the top plate portion 111, the pillars 112 and the lower ring 113 are formed flush. Therefore, by wrapping the mesh filter 102 around the outside of the filter holding portion 101 and tightly fixing the inner surface of the mesh filter 102 to the outer surfaces of the top plate portion 111, the pillars 112 and the lower ring 113, the filter 100 can be secured. Easy to form.
  • the upper end of the mesh filter 102 is fixed to the side surface of the top plate portion 111 , the lower end is fixed to the side surface of the lower ring 113 , and the mesh filter 102 is vertically supported by the pillars 112 . Therefore, mesh filter 102 is less likely to be deformed, and blood can be stably passed therethrough.
  • the length of the pillar 112 may be appropriately set according to the required blood flow rate and the like, but in the case of a filter for a normal blood circuit, it is preferably about 20 mm from the viewpoint of securing an opening. Moreover, the width of the pillar is preferably about 2.5 mm from the viewpoint of securing the strength.
  • the method for tightly fixing the mesh filter 102 to the filter holding portion 101 can be welding, adhesion, or the like.
  • the mesh filter 102 may be wrapped around the filter holding portion 101 and then welded by pressing a jig from the outside.
  • the melted portion of the filter holding portion 101 forms a structure in which the mesh filter 102 and the mesh filter 102 are entangled, so the fixing method can be easily determined.
  • the mesh filter 102 is fixed to the outer surface of the top plate portion 111 .
  • the top plate portion 111 is formed in a thick plate shape, and the bottom surface is positioned closest to the outer edge. getting higher. Therefore, there is no space above the upper end of mesh filter 102 through which blood can pass, and blood is less likely to stagnate.
  • the outer diameter of the top plate portion 111 may be appropriately determined according to the size of the chamber, the required blood flow rate, and the like.
  • the thickness of the outer edge in the axial direction is about 3 mm.
  • a top plate opening 116 is provided in the top plate portion 111 .
  • the top plate opening 116 is in the shape of a groove extending in the circumferential direction and provided between the central portion 111a and the outer edge portion 111b.
  • the center portion 111a and the outer edge portion 111b are connected by spoke portions 111c provided every 90°, and the top plate opening 116 is divided into four.
  • the top plate opening 116 has a radial width D2 at the lower end smaller than a radial width D1 at the upper end, as shown in FIG.
  • a radial width D2 at the lower end is a width that does not allow blood clots or the like to pass through.
  • a specific value of D2 may be determined in consideration of various conditions, and may be, for example, about 0.3 mm.
  • D1 is not particularly limited, it can be, for example, about 1 mm. However, D1 can also be equal to D2.
  • the top plate opening 116 has a hole wall 116b on the side of the outer edge 111b that is a vertical surface, and the hole wall 116a on the side of the central portion 111a approaches the hole wall on the side of the outer edge as it goes downward. It has a sloped surface.
  • the hole wall 116b on the outer edge side a vertical surface, the radial thickness of the ring-shaped outer edge portion 111b outside the top plate opening 116 is constant, so that distortion is less likely to occur during molding.
  • the side surfaces of the top plate portion 111 can be made smooth. Therefore, the mesh filter 102 can be easily welded to the side surface of the top plate portion 111 .
  • the hole wall 116b on the side of the outer edge 111b may be an inclined surface. and the hole wall 116a on the central portion 111a side may be inclined.
  • the top plate opening 116 has a groove shape divided into four in the circumferential direction, but the number of divisions can be set arbitrarily. Alternatively, a plurality of radially extending grooves may be arranged radially.
  • the lower surface of the top plate portion 111 is formed with a lower convex portion 117 whose height gradually increases from the outer edge portion 111 b toward the center of the top plate portion 111 .
  • the bubbles that have reached the lower surface of the top plate portion 111 move along the lower surface convex portion 117 toward the top plate opening portion 116 side. Therefore, the air bubbles can be more easily removed during priming.
  • the projection height h1 of the lower surface convex portion 117 is not particularly limited, but is preferably about 1.6 mm from the viewpoint of improving air bubble removal.
  • the lower convex portion 117 may be provided as needed, and may not be provided.
  • a recess 111d is provided in the central portion of the upper surface of the top plate portion 111 .
  • the concave portion 111d is a trace of a gate at the time of molding, but by providing the concave portion 111d on the upper surface corresponding to the lower surface convex portion 117, it is possible to obtain the effect of suppressing the change in the thickness of the central portion 111a and facilitating molding.
  • the outer edge of the upper surface of the top plate portion 111 is chamfered. Moreover, the upper end of the hole wall of the top plate opening 116 is chamfered. Further, the recess 111d is a dish-shaped shallow depression. Therefore, the upper surface of the top plate portion 111 does not have sharp corners, and the occurrence of hemolysis due to the corners can be suppressed.
  • the outer diameter of the top plate portion 111 and the outer diameter of the lower ring 113 are the same, and the filter 100 has a columnar shape with a constant outer diameter.
  • the filter 100 of the present embodiment has a columnar shape, the amount of blood passing through the mesh filter is substantially constant, and blood is less likely to stagnate in the filter, thereby suppressing the occurrence of blood coagulation.
  • the shape of the chamber main body 200 is the same, retention outside the filter is less likely to occur in the truncated cone-shaped filter.
  • a cylindrical filter is preferable.
  • the mesh filter 102 cut into a rectangular shape can be wound around the filter holding portion 101, so that the filter 100 can be formed very easily. It also has the advantage of being easier to
  • a flange portion 114 having a larger outer diameter than the lower ring 113 is provided at the lower end of the lower ring 113 .
  • a notch 114 a is provided in the flange portion 114 at a position corresponding to the pillar 112 .
  • the flange portion 114 also functions as an attachment portion for attaching the filter 100 to the chamber body 200 .
  • the fitting of the flange portion 114 into the recess provided on the inner surface of the lower cap 206 facilitates the attachment of the filter 100 to the chamber main body 200 .
  • the fixing of the filter 100 to the chamber main body 200 is not limited to such a method.
  • the outer diameter of the flange portion 114 is not particularly limited, but is about 10% to 20% larger than the outer diameter of the lower ring 113 from the viewpoint of facilitating winding of the mesh filter 102 and facilitating attachment to the chamber body 200. preferably.
  • the flange portion 114 does not necessarily have to be provided at the lower end of the lower ring 113 unless it is at the upper end. Also, the flange portion 114 may not be provided. A flange portion 114 without the notch 114a can also be provided.
  • the mesh filter 102 a mesh having an opening of about 40 ⁇ m to 100 ⁇ m for normal foreign matter removal can be used, but a mesh made of a relatively hydrophilic material such as polyester is preferable. A mesh that has been subjected to a hydrophilic treatment can also be used.
  • the filter holding part 101 may be made of any material as long as it can tightly fix the mesh filter 102 . When fixing a polyester mesh filter by high-frequency welding, polypropylene is preferable because it is easily weldable.
  • the drip chamber of this embodiment can be connected to either the arterial side or the venous side of the blood circuit.
  • the drip chamber filter of the present disclosure is less prone to stagnation and can be used for drip chambers of blood circuits and the like.

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  • Health & Medical Sciences (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Biomedical Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Cardiology (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Infusion, Injection, And Reservoir Apparatuses (AREA)
  • External Artificial Organs (AREA)

Abstract

L'invention concerne un filtre à chambre compte-gouttes 10) composé d'une plaque supérieure (11), d'une bague inférieure (12), de plusieurs nervures (13) reliant la plaque supérieure (11) et la bague inférieure (12) et formant plusieurs fentes (15) entre elles, et d'une bague centrale (14) reliant les nervures entre elles et se déployant dans le sens de la circonférence. Les nervures (13) comprennent chacune une section circonférentielle externe (13a) et une section circonférentielle interne (13b) de forme triangulaire. L'angle formé par le sens dans lequel une surface latérale de la section circonférentielle interne (13b) se déploie et un sens radial est plus grand que celui de la section circonférentielle externe (13a). L'épaisseur de la bague centrale (14) dans le sens radial est inférieure à l'épaisseur de chaque nervure (13) dans le sens radial à l'endroit où la bague centrale (14) est formée.
PCT/JP2022/041840 2021-11-11 2022-11-10 Filtre de chambre compte-gouttes WO2023085343A1 (fr)

Applications Claiming Priority (2)

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JP2021-183804 2021-11-11
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Publication number Priority date Publication date Assignee Title
US20100256547A1 (en) * 2006-12-01 2010-10-07 Gambro Lundia Ab Blood transfer chamber

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100256547A1 (en) * 2006-12-01 2010-10-07 Gambro Lundia Ab Blood transfer chamber

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