JP2009125524A - Flow path sealing member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flow path sealing member capable of securing the large flow path of a step part when a part of the flow path sealing member is abutted to the annular step part inside a tube after fracture. <P>SOLUTION: In the flow path sealing member 1 comprising a cylindrical fixed base part 2 fixed to the inner surface of the tube and opened at both ends, a blocking part 3 forming a gap with the tube and blocking the opening end on the downstream side of the fixed base part 2, and a fracture part 4 formed between the fixed base part 2 and the blocking part 3, the blocking part 3 includes a main body 5, a groove 6 formed on the surface of the main body 5 along the axial direction of the main body 5, and a pair of projection bodies 7 formed so as to be projected to the radial direction outer side more than the main body 5 on both sides of the downstream end of the groove 6. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is mainly applied to a medical tube, and relates to a flow path sealing member that initially closes a flow path in a tube and opens the flow path when necessary.

  As a conventional example of a flow path sealing member that opens a flow path by first blocking the flow path in the tube in a tube for flowing blood or medical fluid and receiving a breaking operation when necessary and partially breaking Reference 1 is cited.

The flow path sealing member described in Patent Document 1 (the communication piece in the literature) has a body portion and a blade portion integrally formed via a fracture portion (a thin-wall portion in the literature). It is formed in a flat shape from the tip toward the tip. Since the blade portion does not contact the inner surface of the tube, after the breaking operation, the blade portion receives the flow of fluid and flows downstream.
Japanese Patent No. 3429900

  On the downstream side of the tube, in many cases, a stepped portion having a small inner diameter of the tube is provided for the purpose of receiving the flowed channel sealing member piece. Thus, the inner wall shoulder portion of the connecting cylinder with respect to the blade portion hits this. In Patent Document 1, in order to prevent the flow path of the stepped portion from being blocked when the blade portion hits the stepped portion, the blade portion is formed in a flat shape as described above, and from the spaces on both sides of the blade portion. It has a structure that allows fluid to flow.

  However, with this technique, the flow path of the stepped portion is made very small by the tip of the blade portion, and particularly when the flow passage cross-sectional area of the stepped portion is small, the tip of the blade portion may block the flow channel. is there.

  The present invention was created to solve the above problems, and when a part of the flow path sealing member hits an annular stepped portion in the tube after breaking, the flow path of the stepped portion It aims at providing the flow-path sealing member which can ensure large.

  In order to solve the above-mentioned problem, the present invention forms a cylindrical fixed base fixed to the inner surface of the tube and having openings formed at both ends, and forms a gap with the tube, and closes the open end on the downstream side of the fixed base. And a breaking portion formed between the fixed base portion and the closing portion, and installed in advance to block the flow path in the tube, and the flow path is opened by breaking the breaking portion. The flow path sealing member includes a main body, a groove formed on the surface of the main body along the axial direction of the main body, and a radial direction from the main body on both sides of the downstream end of the groove. And a pair of projecting bodies formed so as to project outward.

  According to this flow path sealing member, after breaking, the fluid enters the groove from the surface of the main body, and flows downstream via the space between the pair of protrusions. The projecting body protrudes radially outward from the main body, and since the gap between the projecting body and the inner surface of the tube is small, fluid does not easily flow into the outer surface of the projecting body and efficiently enters the space between the projecting bodies. Flows in. Further, when the blocking portion moves downstream, the gap with the inner surface of the tube is small, so that the protruding body is smoothly guided to the inner surface of the tube, so that the movement posture of the blocking portion is stabilized. Therefore, the closed portion is not caught on the inner surface of the tube after breaking. When the closed portion reaches the stepped portion on the inner surface of the tube, the abutting portion becomes the edge of the projecting body, and the space between the projecting bodies and the flow path of the stepped portion are in large communication, so that a sufficient flow area is provided in the stepped portion. Is secured.

  According to the present invention, the channel sealing member is characterized in that the groove has a length that is half or more of the entire length of the main body.

  According to this flow path sealing member, the fluid can be smoothly sent to the space between the protrusions by making the length of the groove more than half of the entire length of the main body.

  Further, in the present invention, the groove is formed as a pair with the axis of the main body interposed therebetween, and the projecting body has a recess that communicates with both grooves and that is open on the downstream side. A sealing member was obtained.

  According to this flow path sealing member, when the closed portion reaches the stepped portion on the inner surface of the tube, the abutted portion becomes the edge of the projecting body, and in addition to the space between the projecting bodies, the recessed portion is larger than the flow path of the stepped portion. Communicate. Therefore, a further channel area is ensured in the step portion.

  According to the present invention, a large flow path can be secured even when a part of the flow path sealing member hits the annular stepped portion in the tube after the fracture.

  First, an example of a flow path in which the flow path sealing member of the present invention is used is shown in FIG. 5, and the flow of the usage method will be described. FIG. 5 is a flow path configuration diagram of a blood collection processing unit used for blood donation. The downstream end of the tube 102 connected to the blood collection needle 101 communicates with one of the trifurcated branch paths, the other one of the branch paths communicates with the sampling port 103 through the tube 104, and the other through the tube 106. It leads to the blood collection bag 105.

  Specifically, the trifurcated branch path is composed of a single branch tube 107. The first branch path 107A, the second branch path 107B, and the third branch path 107C are the downstream end of the tube 102 and the tube 104, respectively. To the upstream end of the tube 106. A flow path sealing member 1 to be described later is connected in advance to the third branch path 107 </ b> C in the branch tube 107 in an unused state.

  First, the blood collected from the donor (donor) by the blood collection needle 101 flows from the tube 102 to the tube 104 side because the third branch 107C is blocked by the flow path sealing member 1, and is sampled. It is processed as test blood at the port 103. Thereafter, the flow to the sampling port 103 side is stopped using the shutter clamp 108 provided in the middle of the tube 104, the flow path sealing member 1 is broken, and the third branch path 107C is opened, so that the blood of the donor Is sent to the blood collection bag 105 through the tube 106. The blood from the blood collection bag 105 is sent to the blood bag (parent bag) 110 via the filter 109. The blood in the parent bag 110 is separated, and the separated plasma is transferred to the first child bag 111. Thereafter, the preservation solution in the second child bag 112 is added to the concentrated red blood cells in the parent bag 110.

  Hereinafter, the flow path sealing member 1 will be described in detail. 1A, 1B, and 1C are a plan view, a side view, and a front view, respectively, and FIGS. 2A, 2B, and 2C are respectively in FIG. AA sectional view, BB sectional view, CC sectional view, FIG. 3 is an external perspective view of the flow path sealing member, and FIG. 4 is an operation explanatory view of the flow path sealing member after fracture.

  As shown in FIGS. 1 to 4, the channel sealing member 1 is fixed between the inner surface of the tube T and the inner surface of the tube T. And a closed portion 3 that closes the opening end on the downstream side of the fixed base portion 2, and a fracture portion 4 that is formed between the fixed base portion 2 and the closed portion 3.

  The tube T is connected to, for example, the third branch passage 107C of the branch tube 107 described above, and is made of vinyl chloride or the like. On the inner surface around the downstream side of the tube T, a small-diameter stepped portion Ta (FIG. 4) is formed. The flow path sealing member 1 is a member in which a fixed base 2, a closing portion 3, and a fracture portion 4 are integrally formed (FIG. 3), and the material is made of polycarbonate or the like.

  The cylindrical portion on the downstream side of the fixed base portion 2 is gradually reduced in diameter toward the downstream side and continues to the thin-walled fracture portion 4. The blocking portion 3 includes a main body 5 formed continuously to the fracture portion 4, a groove 6 formed on the surface of the main body 5 along the axial direction of the main body 5, and both sides of the downstream end 6 </ b> B of the groove 6. And a pair of projecting bodies 7 formed so as to project outward in the radial direction.

  The main body 5 has a cylindrical shape. The groove 6 is formed in order to allow a fluid such as blood to flow efficiently between the pair of downstream projecting bodies 7. In this embodiment, the groove 6 is paired with the axis of the main body 5 interposed therebetween. Forming. The upstream wall of the groove 6 is formed as an inclined surface 6A so as to smoothly guide the fluid into the groove. Further, the groove 6 has a length of more than half of the entire length of the main body 5, preferably 3/4 or more. The total length of the main body 5 refers to the length from the boundary with the fracture portion 4 to the downstream end 6B.

  The projecting body 7 has an outer shape that can form a gap with the inner surface of the tube T, and the edge of the downstream end surface of the projecting body 7 abuts on the stepped portion Ta (FIG. 4). The protruding body 7 of the present embodiment protrudes downstream from the downstream end 6B of the groove 6 and has a U-shape when viewed in the axial direction. That is, the protrusion 7 has a shape having a recess 8 that communicates with both grooves 6 and that is open on the downstream side. The distance between the bottoms of the recesses 8 facing each other is substantially the same as the inner diameter of the stepped portion Ta as shown in FIG.

  The operation of the flow path sealing member 1 having the above configuration will be described. The flow path is closed by the closing portion 3 in a state before the breaking portion 4 is broken. When necessary, when an external force is applied from the outside of the tube T to break the fracture portion 4, the closed portion 3 is moved to the downstream side in response to the fluid flow, and the downstream opening end of the fixed base portion 2 is opened. .

  The fluid flowing out from the opening end on the downstream side of the fixed base 2 enters the groove 6 from the surface of the main body 5 and flows downstream through the space between the pair of protrusions 7 and the recess 8. By setting the length of the groove 6 to more than half of the entire length of the main body 5, preferably 3/4 or more, the fluid can be smoothly sent to the space between the protrusions 7 and the recess 8. The projecting body 7 protrudes radially outward from the main body 5, and the gap between the projecting body 7 and the inner surface of the tube T is small. Flow in. Further, since the gap with the inner surface of the tube T is small when the closing portion 3 moves downstream, the projecting body 7 is smoothly guided to the inner surface of the tube T, so that the moving posture of the closing portion 3 is stabilized. Therefore, the blocking portion 3 is not caught on the inner surface of the tube T after the breakage.

  And as shown in FIG. 4, even if the blocking part 3 flows and reaches the small-diameter stepped part Ta formed on the downstream side of the tube T, the edge of the projecting body 7 hits the stepped part Ta. Therefore, the flow path of the stepped portion Ta is not blocked, and the concave portions 8 on both sides communicate with the flow path of the stepped portion Ta with a large overlap.

  In particular, when the wall portion of the stepped portion Ta is formed with a gentle curved surface and an inclined shape, the wall portion contacts the edge of the projecting body 7 and the axis of the blocking portion 3 is placed on the axis of the tube T. Acts to induce. Thereby, the eccentricity of the blocking portion 3 with respect to the tube T is prevented, and the opening interference due to the stepped portion Ta can be prevented, so that the opening area of the concave portion 8 can be secured to that extent.

  The preferred embodiments of the present invention have been described above. The flow path sealing member according to the present invention is not limited to a blood collection tube, but can be applied to other medical tubes and tubes used in other fields.

(A), (b), (c) is the top view, side view, and front view of the flow-path sealing member which concern on this invention, respectively. (A), (b), (c) is AA sectional drawing in FIG. 1, BB sectional drawing, and CC sectional drawing, respectively. It is an external appearance perspective view of the flow-path sealing member which concerns on this invention. It is action | operation explanatory drawing of the flow-path sealing member after a fracture | rupture. It is a flow-path block diagram of a blood collection processing unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Flow path sealing member 2 Fixed base 3 Blocking part 4 Breaking part 5 Main body 6 Groove 7 Projection body 8 Recessed part T Tube

Claims (3)

A cylindrical fixed base fixed to the inner surface of the tube and having both ends opened;
A closed portion that forms a gap with the tube and closes an open end on the downstream side of the fixed base;
A breaking portion formed between the fixed base and the blocking portion;
A flow path sealing member that is installed so as to block the flow path in the tube in advance, and opens the flow path by breaking the fracture portion,
The blocking part is
The body,
A groove formed on the surface of the main body along the axial direction of the main body,
On both sides of the downstream end of the groove, a pair of protrusions formed so as to protrude radially outward from the main body,
A flow path sealing member comprising:   The flow path sealing member according to claim 1, wherein the groove has a length that is at least half of the entire length of the main body. A pair of the grooves are formed across the axis of the main body,
3. The flow path sealing member according to claim 1, wherein the protrusion has a concave portion that communicates with both grooves and that is open on a downstream side. 4.

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