JP3409324B2 - Medical fluid flow switching device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a medical fluid flow path switching device, and more particularly to a medical fluid flow path switching device used for switching the flow path of a CAPD (continuous peritoneal dialysis device) system.

[0002]

2. Description of the Related Art (1) In a CAPD (continuous peritoneal dialysis device) system, as shown in FIG. 1, a first tube 1 connected to a catheter embedded in a patient's body and a first tube connected to the first tube A second tube 2 connected to the other end of the Y-shaped tube 4 and connected to a dialysate bag 5 for supplying new dialysate to the patient, and dialysate stored in the abdominal cavity of the patient for a certain period of time. The three clamps C1, C2, C3 provided on each tube of the third tube 3 connected to the drainage bag 6 for discharging are to be operated according to the procedure shown in the table below. I won't.

[0003]

[Table 1] In the table above, the number of → is the number of operations.

In order to perform the above series of operations, the patient must
Since the clamp has to be opened and closed once and the procedure is complicated, there is a possibility of causing an erroneous operation, and it is difficult to introduce the system into a new patient. Japanese Patent Application No. 9-237696 discloses a solution to this problem.

(2) The invention described in Japanese Patent Application No. 9-237696 discloses, as shown in FIGS. 2 and 3, a cam K which rotates in conjunction with a rotation operation of a shaft to close / open the tube 7.
A housing having tube through holes H and I on three sides and capable of holding the cam K, and a force component for inserting the tube 7 and fixedly provided in the housing to close the tube 7 of the cam K. Is a medical fluid flow path switching device including a member S (hereinafter, referred to as “transmission member”) that transmits the fluid to the tube 7. The cam K has three notch structures a shown in FIG. The three notch structures a have the common parts g, c, d,
Table 1 shows the three notch structures a by sequentially rotating the operating handle A attached to the rotary shaft to a predetermined position displayed on the upper part of the housing. Clamps C1 and C at each position
It functions in the same manner as 2 and C3, and enables a plurality of clamping operations for each position to be performed at one time.

[0006]

However, in the above-mentioned device, the tube 7 is closed by positioning the portion d of the cam K on the transmission member S through which the tube 7 is inserted. There is a problem that the rotation operation of the rotary shaft when reaching the portion d from the portion g to the portion e is very stiff when using a tube having the same diameter as the conventional one, and the operability is poor. Further, the above-mentioned device is not preferable because it has a configuration in which the Y-shaped tube 4 in which tubes are connected in three directions and the three transmission members S are housed in the housing, because the entire device becomes large.

An object of the present invention is to provide a smaller-sized medical fluid flow path switching device which can favorably rotate the cam.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a rotatable shaft, a cam that rotates in conjunction with the rotational operation of the shaft, and a port that can hold the cam and that has a liquid feed tube connected to one end. A housing having a portion, a sheet-like member provided in the vicinity of the other end opening of the port portion, and a press-contact means for press-contacting the sheet-like member with the other end opening of the port portion in association with the rotation of the cam. Is a medical fluid flow path switching device.

[0009]

FIG. 4 shows an exploded perspective view of an example of a medical fluid flow path switching device of the present invention. However, the medical fluid flow path switching device of the present invention is not limited to these drawings.

In the medical fluid flow path switching device of FIG. 4,
A cam K is pivotally mounted, has a shaft F having an operating handle A, an insertion hole G and a port insertion hole H of the shaft F, and is fitted with a housing lower portion E to form a housing capable of accommodating the cam K. A circular housing upper part D, a circular housing lower part E having a port portion B at a position corresponding to the port insertion hole H of the housing upper part D, the housing upper part D
A sheet-like member I provided in the housing constituted by a housing lower part E and in order from the bottom of the housing lower part E near the other end opening b of the port part B. The pressure contact means L for pressure contact with the other end opening b rotates in conjunction with the handle operation of the handle A by the operator, and the sheet-like member I is opened at the other end of the port portion through the pressure contact means L at a selected position. It is configured to have a cam K that is pressed against and separated from b to open and close the fluid flow path.

The medical fluid flow path switching device of the present invention is, for example, as shown in FIG. 10, a first tube 1, a second tube 2, and a third tube of the CAPD (continuous peritoneal dialysis device) system shown in FIG. Connect each of the tubes 3 to the port parts B1 and B
2 and B3 are used. The medical fluid flow path switching device of the present invention is a CAPD (continuous peritoneal dialysis device).
The switching of the fluid flow path at the other end opening b of each port when used in the system is operated according to the positions shown in Table 2 below. 6 to 7 show the open / closed state of each flow path when each position shown in Table 2 below is selected by the medical fluid flow path switching device of the present invention. In this figure, if the other end openings b1, b2, b3 of the port portion are black circles, it means that the flow path is closed, and white circles mean that the flow path is open.

[0012]

[Table 2] Hereinafter, each position in Table 2 will be described with reference to FIGS.

[Position 1 (Initial State)] FIG.
As shown in (1), the other end openings b1, b2,
All of b3 are separated from the sheet-like member, and the fluid flow path is in an open state, but it is not necessarily in this state and is selected in consideration of the sterilization method, the material of the sheet-like member, and the like. Is.

[Position 2 (drainage)] As shown in FIG. 6 (2), b1 and b3 are opened to secure the flow path between the abdominal cavity of the patient and the drainage bag.

[Position 3 (Flushing)] FIG.
As shown in (3), b2 and b3 are opened to secure the flow path between the dialysate bag and the drainage bag. In this position, fresh dialysate in the dialysate bag cleans the fluid flow path R in the housing. [Position 4 (Injection)] As shown in FIG. 7 (4), b2 and b1 are opened to secure a flow path between the dialysate bag and the abdominal cavity of the patient.

[Position 5 (End)] As shown in FIG. 7 (5), all of b1, b2, and b3 are closed, and the inflow and outflow of fluid at any of the ports is blocked.

The following may be applied within the scope of the gist of the medical fluid flow path switching device of the present invention. Each position can be selected manually by rotating the axis manually,
All may be automatically controlled mechanically. Position 3 is automatically controlled mechanically by setting the time,
At positions 2 and 4 where liquids are exchanged with the patient, there are individual differences in the discharge speed of drainage etc. depending on the patient, so it can be performed manually.

In the conventional method, in order to operate the positions shown in Tables 1 and 2, the clamps C1, C2, and C3 at each position are opened or closed to operate each flow path. Although it was necessary to perform the switching individually, in the present invention, the respective flow paths can be switched by selecting the respective positions by the rotary shaft, and therefore, the fluid flow path switching operation of the patient is simplified. .

The components of the fluid flow path switching device of the medical system of the present invention will be specifically described below.

(1) Housing As shown in FIG. 4, the housing is composed of an upper part D and a lower part E. Inside the upper portion D and the lower portion E, a storage chamber capable of storing the cam K, the sheet-shaped member I, and the pressure contact means L is formed. On the upper portion D, the handle through hole G and on the surface, predetermined positions for switching the flow path are displayed. Three port parts B1, B2, B3 are formed in the lower part E so as to be separated from each other, a liquid feeding tube (not shown) is connected to one end of each port part, and the other end extends into the storage chamber. Then, a circuit is formed that opens upward (the other end openings b1, b2, b3 of the port portion). In addition, a port insertion hole H is formed in the upper portion D of the housing at a position corresponding to the lower three port portions. The shape of the housing is preferably a hollow cylindrical shape, and is preferably as compact as possible. The other end opening b of the port portion
1, b2, b3 are portions (hereinafter referred to as "pressure contact portions") Q1, Q2, Q3 for pressing the sheet-like member I of the pressure contact means L described later to the other end openings b1, b2, b3 of the port portion.
It has a positional relationship with each other. In the housing,
In the space formed by liquid-tightly sealing the peripheral edge of the sheet-shaped member I and the inner peripheral edge of the housing lower portion E, fluid flows from the other end opening of the one port portion to the other end opening of the other port portion. The flow path R up to is formed.

Although FIG. 4 shows the case where the cam K is housed in the housing, it is not always necessary to house it in the housing, and the housing upper part D and the cam K are integrally formed as shown in FIG. It may be one. In short, if the housing has a function of holding the shaft F, the cam K fixed to the shaft F, the pressing means L, and the sheet-like member I, its shape and structure are not particularly limited. is not.

The other end openings b1 and b2 of each port are
In FIG. 4, b3 shows the one that extends into the storage chamber and opens in a substantially vertical upward direction. However, the present invention is not limited to this, and may be one that opens facing one end of the port portion, for example. Good. Further, it is not always necessary to extend the inside of the storage chamber to form a circuit, and the other end opening of the port portion may be formed on the same plane as the inner wall of the housing. In short, the other end openings b1, b2, b3 of each port section
Is formed at any position in the housing as long as it is in a positional relationship slightly separated from a sheet-like member I described later and is in a positional relationship facing the pressure contact portion Q pressed by the cam K. May be.

Examples of materials for forming the housing include metals such as stainless steel, ceramics, heat-resistant synthetic resin materials such as polyacetal, polycarbonate, polypropylene, ABS resin, and polyethylene.

(2) The axis operator can select each position by rotating the axis F or the handle A connected to the axis F.

(3) Sheet-like member The sheet-like member I has the other end openings b1 and b of the port portion.
2 and b3 are housed in the housing housing so as to cover them with a slight distance. The sheet-like member I is liquid-tightly sealed to the housing so that a flow path R from the other end opening of the one port portion to the other end opening of the other port portion is formed in the housing. . The sheet-like member I is directly pressed / released by a pressure-contacting portion Q of a pressure-contacting means L, which will be described later, and is pressure-contacted / separated from the other end openings b1, b2, b3 of the port portion. For example, the sheet-like member I has a disk shape as shown in FIG.
It is preferable that it is liquid-tightly sealed with the inner peripheral edge. It may be donut-shaped. The sheet-like member I
Is in pressure contact with the opening on the other end of the port portion, the opening on the other end of the port portion is closed and the inflow / outflow of the fluid is blocked. When the sheet-shaped member I and the other end opening of the port part are separated from each other, the other end opening of the port part is opened, and the inflow and outflow of the fluid are allowed. By positioning the cam at each of the positions, the other end openings b1, b2 of the respective port portions,
Any one of the three openings of b3 is closed to allow the inflow and outflow of the fluid between the two port portions, and two or more openings of the other end opening of the port portion are closed to allow the inflow of the fluid to any of the locations. It is designed to prevent the outflow. Examples of the sheet-shaped member I include a flexible synthetic resin sheet such as polyethylene and polypropylene.

(4) Pressing means The pressing means L is, for example, as shown in FIG.
Portions near the positions corresponding to the other end openings b1, b2, b3 of the respective port portions are cut off with a part left, and the sheet is bent downward and upward in a disk shape with the part as a fulcrum, and the sheet is attached to the tip apart from the fulcrum. Pressure contact portion Q1 for directly pressing and releasing the member I,
It has Q2 and Q3. However, the present invention is not necessarily limited to these, and the other end opening b1 of the port portion is pressed and released by a cam described later,
Any of b2 and b3 has a part (press contact part Q1, Q2, Q3) for pressing and separating the sheet-like member I, and is flexible enough to easily follow the pressing and releasing by the cam. It may have a form. Although it is separate from the housing in FIG. 4, it may be provided integrally. Further, the pressure contact means L includes the pressure contact parts Q1, Q2, Q.
3 and the other end openings b1, b2, b3 of the respective port portions are installed in the housing so as not to cause misalignment due to rotational operation of the shaft.

(5) Cam The cam K is rotated by the above-mentioned shaft operation in conjunction with the shaft operation,
It has a structure capable of forming the required open / closed state of the flow path at each position via the pressure contact means L. As a cam adopted in the present invention, for example, as shown in FIG. 4, a cam having a circular plane direction and a notch structure on its side surface can be cited. Notch structure a shown in FIG.
Is a part g for ensuring the open state of the flow path, a part c for transitioning the flow path from the closed state to the open state, a part d for maintaining the closed state of the flow path, and a part for transitioning the flow path from the open state to the closed state. It is configured to have e.

The vertical distance h between the portion g that maintains the open state of the flow path and the portion d that maintains the closed state of the flow path is the position where the press contact portion Q opens the other end opening b of the port portion. It is almost the same as the locus of moving from the to the closing position. That is, if the thickness h of the sheet-like member I is not taken into consideration, the vertical distance h between the portion g and the portion d is equal to the pressure contact portion Q,
It is about the same as the clearance f from the other end opening b of the port portion.

Further, in FIG. 4, the cam K used in the present invention has a three-dimensional shape, but has a planar shape (plate shape), and has a plurality of the notch structures on the side surface of the planar cam. It may be.

The medical flow path switching device of the present invention is a CAPD.
(Continuous peritoneal dialysis device) It is useful as a fluid flow path switching device for the Y-shaped tube connection portion of the system, but is also useful for medical devices equipped with other fluid flow path switching devices. For example, an infusion set, one that mixes several types of drug solutions at the time of use to form a one-liquid formulation (mixing before use) and administer (
In nutritional infusion, a formulation containing amino acids and electrolytes,
In the case of glucose and bicarbonate-containing peritoneal dialysate, bicarbonate-containing solution and glucose-containing solution), blood circuit, blood transfusion set, blood component separation system, etc. may be mentioned.

[0031]

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 4 is an exploded perspective view of an embodiment of the medical fluid flow path switching device of the present invention. In FIG. 8, the pressure contact portion Q is released by the cam K, and the sheet-like member I and the other end opening b of the port portion are shown.
It is a figure which shows the state which is separated. FIG. 9 is a view showing a state in which the sheet-shaped member I is pressed against the other end opening b of the port portion by the pressing portion Q pressed by the cam K.

As shown in FIG. 4, in the medical flow path switching device of the present invention, in order from the top, (1) a shaft K having a cam K attached thereto and having an operating handle A, and (2) the shaft F. Through hole G
And a circular housing upper part D having a port insertion hole H and fitting with a housing lower part E to form a cam K, and (3) interlocked with the handle operation of the handle A by the operator. The sheet-like member I at the selected position and the other end openings b1, b2, b3 of the port portion are rotated.
A cam K capable of pressing / releasing a pressure contact portion Q to be pressed against to open / close the flow path of the fluid, and (4) directly pressing the sheet-like member I to the other end openings b1, b2, 3b of the port portion. Pressure contact means L having a pressure contact portion Q to be separated (5)
A sheet-like member I provided close to the other end openings b1, b2, 3b of the port portion and liquid-tightly sealed to the peripheral edge of the housing lower portion E, (6) Corresponding to the port insertion hole H of the housing upper portion D. Has port portions B1, B2, B3 at the positions where the other ends of the port portions B1, B2, B3 extend into the inside of the housing and open in the substantially vertical upward direction. and a circular housing lower part E having b3.

The handle A is rotated by the operator to each position shown in Table 2, and the position is displayed on the circular plane of the upper part D of the housing. Positions 1 to 4 are set clockwise at 90 ° intervals, and position 5 is set to a position 45 ° clockwise from position 4.

The cam K has a circular shape in the plane direction, and three notch structures a shown in FIG. 5 are formed on the side surface at 90 ° intervals. The open / closed states of the other end openings b1, b2, b3 of the port portion when the operating handle A is in the positions 1 to 5 are shown in FIGS.

The pressure contact means L has a substantially disk shape, and is cut off with a part left near the positions corresponding to the other end openings b1, b2, b3 of the respective port parts, and a disk shape with this part as a fulcrum. It is designed to bend downward and upward. Pressure contact portions Q1, Q2, and Q3 are formed at the tip away from the fulcrum. Further, the pressure contact means L is provided on the lower part E of the housing so that the positional relationship between the pressure contact parts Q1, Q2, Q3 and the other end openings b1, b2, b3 of the port part is not damaged by the rotation of the cam. It is fixed.

As shown in FIGS. 8 and 9, the side of the pressure contact portion Q that is in pressure contact with the sheet-like member I is hemispherical, and the side that is pressed by the cam is flat.

As shown in FIG. 8, the portion g of the cam K is located on the pressure contact portion Q, the sheet member I is released from the pressure contact portion Q, and the sheet member I is separated from the other end opening b of the port portion. When the flow path is open, the flow path is in the open state, and the inflow / outflow of the fluid is allowed.

As shown in FIG. 9, when the portion d of the cam K is located on the pressure contact portion Q and the sheet member I is pressed against the other end opening b of the port portion by the pressure contact portion Q,
The flow path is in a closed state, and the inflow and outflow of fluid is blocked.

[0040]

The medical fluid flow path switching device of the present invention has the following effects due to the above configuration. The handle operation of the patient is light and the operability is improved. Since the Y-shaped tube, the transmission member, and the like are not housed in the housing housing portion, the size of the device can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a conventional CAPD (continuous peritoneal dialysis device) system.

FIG. 2 is an exploded perspective view of an example of a conventional medical fluid flow path switching device.

FIG. 3 is a front sectional view of a conventional medical fluid flow path switching device.

FIG. 4 is an exploded perspective view of an example of the medical fluid flow path switching device of the present invention.

FIG. 5 is an example of a notch structure of a cam used in the medical fluid flow path switching device of the present invention.

FIG. 6 is a view showing each position selected in the medical fluid flow path switching device of the present invention, the opening of the flow path, and the closed state. (1) is position 1 (initial state), (2) is position 2 (drainage), (3) is position 3 (flushing)

FIG. 7 is a diagram showing each position selected in the medical fluid flow path switching device of the present invention, the opening of the flow path, and the closed state. (4) is position 4 (liquid injection), (5) is position 5 (end)

FIG. 8 is a diagram showing a state in which a press contact portion Q is released by a cam K and a sheet-shaped member I and the other end opening of the port portion are separated from each other.

FIG. 9 is a view showing a state in which the sheet-shaped member I is pressed against the other end opening of the port portion by the pressing contact portion Q pressed by the cam K.

FIG. 10 is a CAPD (peritoneal dialysis device) system equipped with the medical fluid flow path switching device of the present invention.

FIG. 11 is a diagram showing another example of the medical fluid flow path switching device of the present invention.

[Explanation of symbols]

1 first tube 2 Second tube 3 Third tube 4 Y-shaped tube 5 dialysate bag 6 drainage bags 7 tubes A handle B1, B2, B3 port section b1, b2, b3 Opening of other end of port K cam D housing top E lower housing F handle shaft G Handle shaft F shaft insertion hole H port insertion hole I Sheet-shaped member L pressure welding means Q1, Q2, Q3 Pressure contact area S transmission member R flow path CAM notch structure Portion that maintains the open state of the flow path c Portion where the flow path changes from the closed state to the open state d A part that maintains the closed state of the flow path e Portion where the flow path changes from the open state to the closed state C1, C2, C3 clamp M chemical solution bag Pt patient N drainage bag f clearance h Vertical spacing

Continuation of the front page (56) Reference JP-A-11-128343 (JP, A) JP-A-7-63269 (JP, A) JP-A-8-727 (JP, A) JP-A-9-225025 (JP , A) JP 59-50277 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) A61M 1/00-5/175 A61M 39/00 F16K 7/00-7/20

Claims (4)

(57) [Claims] 1. A rotatable shaft, a cam that rotates in association with a rotational operation of the shaft, a housing that can hold the cam and has a port portion to which a liquid feeding tube is connected to one end, and the port. Medical fluid flow, comprising: a sheet-like member provided in proximity to the other end opening of the port portion; and a pressure contact means for press-contacting the sheet-like member with the other end opening of the port portion in association with rotation of the cam. Road switching device. 2. The medical fluid flow path switching device according to claim 1, wherein the housing further has a through hole of a rotatable shaft, and a cam is housed in the housing. 3. A portion (g) in which the cam maintains an open state of the flow channel, a portion (c) in which the flow channel transitions from a closed state to an open state, and a portion (d) in which the closed state of the flow channel is maintained. And a cutout structure (a) formed by a portion (e) that transitions the flow path from an open state to a closed state.
The medical fluid flow path switching device according to any one of items. 4. A peritoneal dialysis device equipped with the medical fluid flow path switching device according to claim 1, 2, or 3.