JP2531195Y2 - Drip chamber - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an extracorporeal circuit used for extracorporeal circulation and an improvement of a drip chamber arranged in the middle of a blood transfusion / infusion set. 2 and the side wall of the bodily fluid introduction tube 3 are brought into close contact with each other, and the opening cross section 5 of the bodily fluid introduction tube 3 is disposed at substantially the same position as the body fluid level of the main body 2 or below the body fluid level, thereby minimizing the residual bubbles. To provide a drip chamber.

[Problems to be Solved by the Prior Art and the Invention] FIG. 6 is a schematic view of a drip chamber 21 currently used, and FIGS. 7 to 9 are enlarged views showing an aspect near the blood level (FIG. 9). (Corresponding to the BB section in FIG. 8).

The drip chamber 21 has a body fluid introduction pipe
23, a bodily fluid outlet tube 24 is formed in the lower part.

The bodily fluid introduction tube 23 is usually arranged at a distance L from the side wall of the main body 22.

As a mode of storing blood in the drip chamber 21, when the opening cross section 25 of the body fluid introduction tube 23 is above the blood level (see FIG. 6), the opening cross section 25 of the body fluid introduction tube 23 is substantially at the same position as the blood level, When the blood level moves up and down (see FIG. 8), the opening cross section 25 of the bodily fluid introduction tube 23 may be completely immersed in the blood.

In particular, a problem arises in the above case. As shown in FIGS. 7 to 9, a blood stagnation region is formed on the outer periphery of the body fluid introduction tube 23 and the wall surface of the main body 22.

This stagnation area is called meniscus μ, and the force acting on blood and the wall surface of the main body 22 (adhesive force) acts between molecules (cohesive force).
Is larger than the contact surface.

These meniscuses μ are hard to move because they are in equilibrium with the gas pressure P in the main body 22 as shown in FIG. As the distance L decreases, the meniscus μ increases due to capillary action. When air bubbles adhere to this portion, the air bubbles are carried to the gap between the body fluid introduction tube 23 and the wall surface of the main body 22 and do not disappear, thereby inducing blood coagulation.

Therefore, the present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have arrived at the following invention.

[Means for Solving the Problems] FIG. 1 is a schematic view of the drip chamber 1 of the present invention. FIG. 2 is a sectional view taken along line AA of FIG.

The drip chamber 1 has a body fluid introduction pipe 3 formed at an upper part of a main body 2 and a body fluid discharge pipe 4 formed at a lower part.

The side wall of the body fluid introduction pipe 3 is closely attached to the side wall of the main body 2, and the opening cross section 5 of the body fluid introduction pipe 3 is disposed at substantially the same position as the body fluid level of the main body 2 or below the body fluid level.

To arrange the opening cross section 5 of the body fluid introduction tube 3 at substantially the same position as the body fluid level of the main body 2 means that the body fluid enters and exits the body fluid introduction tube 3 from the opening cross section 5 due to the vertical movement of the body fluid level in the main body 2. Means to place it in a location.

By forming in this manner, when the opening cross section 5 of the bodily fluid introduction tube 3 is in the above-mentioned state, the area where the meniscus μ is generated is reduced, and the gap between the side wall of the main body 2 and the side wall of the bodily fluid introduction tube 3 is reduced. Since air bubbles do not enter, coagulation of blood due to remaining air bubbles can be minimized.

As means for bringing the side wall of the main body 2 into close contact with the side wall of the bodily fluid introducing tube 3, a mode in which the respective side walls are bonded with an adhesive, a mode in which both side walls are integrally formed, and a fitting groove of the bodily fluid introducing tube 3 in the main body 2 There is an embodiment in which the body fluid introduction tube 3 is formed and fitted into the fitting groove.

FIG. 3 to FIG. 5 show another embodiment of the present invention. FIG. 3 shows that the main body 2a is kept circular in order to increase the contact area between the side wall of the main body 2 and the bodily fluid introduction tube 3 as much as possible. 4 and 5 show an embodiment in which the main body 2b, 2c and the body fluid introduction pipes 3b, 3c are formed in an elliptical shape. FIG. 4 shows an arrangement in which the major axes of the ellipses are orthogonal to each other, and FIG. 5 shows an arrangement in which the major axes of the ellipses are in the same direction.

[Function and Effect of the Invention] The bodily fluid introduced from the bodily fluid introduction tube 3 is stored in the main body 2, and a meniscus is generated on the outer peripheral surfaces of the main body 2 and the bodily fluid introduction tube 3. Since no meniscus is generated in the gap between the wall surfaces, bubbles introduced together with the bodily fluid hardly remain in the main body 2,
Blood coagulation can be minimized.

[Brief description of the drawings]

FIG. 1 is a schematic view of the drip chamber of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIGS. 3 to 5 are schematic views showing other embodiments of the present invention, FIG. To 9 are schematic views showing a conventional drip chamber. In the figure, 1 is a drip chamber, 2 is a main body, 3 is a body fluid introduction tube, and 4 is a body fluid outlet tube.

Claims (1)

(57) [Scope of request for utility model registration] 1. A drip chamber 1 disposed in the middle of a medical device, wherein a body fluid introduction pipe 3 is formed in an upper part of a main body 2 and a body fluid outlet pipe 4 is formed in a lower part thereof. The drip chamber 1 characterized in that the side cross-section of the body fluid introduction pipe 3 is placed close to the body fluid level of the body 2 or below the body fluid level.