310 in a direction perpendicular to an extending direction thereof. For example, the thinning flow guidance region 310 extends in an arc shape and thus, is an arc-shaped region, and the width of the thinning flow guidance region 310 is the width of the arc-shaped region.

Exemplarily, the width of the thinning flow guidance region 310 is 1 mm to 2.5 mm, and may be 1 mm, 1.5 mm, 2.0 mm, 2.5 mm, for example. The width of the liquid inlet section 1 is 0.6 mm to 1.2 mm, and may be, for example, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm.

Specifically, for example, as shown in FIG. 1, each of the width of the thinning flow guidance region 310 and the width of the liquid inlet section 1 may be 1 mm; alternatively, as shown in FIG. 2, the width of the thinning flow guidance region 310 is 2 mm, and the width of the liquid inlet section 1 is 1 mm.

In one embodiment, as shown in FIGS. 3 and 4, the another region of the main chamber 3 has a constant thickness, i.e. the region of the main chamber 3 other than the thinning flow guidance region 310 has a constant thickness. Thus, the liquid flow in the middle of the main chamber 3 can be kept approximately at the same liquid flow speed in a wider region, and the parallelism of the immunoassay can be guaranteed.

Exemplarily, the ratio of the thickness of the thinning flow guidance region 310 to a thickness of another region in the main chamber 3 is 0.2 to 0.5.

For example, the thickness of another region in the main chamber 3 is 0.5 mm to 0.8 mm, and may be, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm.

For example, the thickness of the thinning flow guidance region 310 is 0.3 mm; the thickness of the another region in the main chamber 3 is 0.6 mm.

In one embodiment, as shown in FIGS. 3 and 4, a thickness of the liquid outlet section 2 is equal to the thickness of the another region of the main chamber 3 (the region of the main chamber 3 other than the thinning flow guidance region 310).

Exemplarily, the thickness of the liquid outlet section 2 is 0.5 mm to 0.8 mm, and may be, for example, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm. Specifically, for example, the thickness of the liquid outlet section 2 is 0.6 mm.

In one embodiment, as shown in FIG. 1 and FIG. 2, in the microfluidic flow channel structure of the present disclosure, a width of the liquid outlet end 32 gradually decreases in a direction from the chamber middle part 33 to the liquid outlet section 2. Therefore, the residual liquid can be conveniently collected so as to be conveniently discharged.

Exemplarily, the liquid outlet end 32 is triangular. For example, the liquid outlet end 32 has a shape of an isosceles triangle with a bottom edge connected to the chamber middle part 33.

Specifically, the liquid outlet end 32 of the main chamber 3 is not limited to be triangular, and may be a trapezoid or a shape having a circular arc edge.

In one embodiment, a width of the liquid outlet section 2 is equal to the width of the liquid inlet section 1.

Exemplarily, centerlines o of the liquid inlet section 1 and the liquid outlet section 2 are substantially aligned with each other, the centerline o is equal to the direction X along which the liquid runs. The main chamber 3 is symmetrical with respect to the centerline o, i.e. the liquid inlet end 31, the chamber middle part 33 and the liquid outlet end 32 are symmetrical with respect to the centerline o.

Exemplarily, the width of the liquid outlet section 2 is 0.6 mm to 1.2 mm, and may be, for example, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm.

In one embodiment, as shown in FIGS. 1 and 2, the chamber middle part 33 is designed as a square shape, and a length of one side of the square close to the liquid inlet end 31 is equal to a chord length of the circular arc edge of the liquid inlet end 31.

For example, the chamber middle part 33 has a square shape.

Obviously, the chamber middle part 33 is not limited to a square shape, and may be in a trapezoidal shape, a polygonal shape, or an irregular shape having an arc-shaped edge.

Specifically, the liquid inlet end 31, the chamber middle part 33 and the liquid outlet end 32 are connected in sequence, and edges of the liquid inlet end 31, the chamber middle part 33 and the liquid outlet end 32 are smoothly connected to form the edge of the main chamber 3. In other words, the edge of the enclosed main chamber 3 is a smooth edge, without steps or sharp corners, etc., to avoid a retention of the liquid reagent.

For example, in the main chamber 3, the liquid inlet end 31 has a semicircular shape, the chamber middle part 33 has a square shape, and the liquid outlet end 32 has a isosceles triangle shape. Each of a radius of the semicircular liquid inlet end 31 and a length of the bottom side of the isosceles triangle of the liquid outlet end 32 is equal to a side length of the square chamber middle part 33, for example, each of the three may be about 20 mm. Two opposite sides of the square chamber middle part 33 coincide with the radius of the semicircular liquid inlet end 31 and the bottom side of the isosceles triangle of the liquid outlet end 32, respectively.

It should be noted that references to “constant” in this application, such as “constant length”, constant width”, “constant thickness”, or the like, specifically means that values are substantially the same with a certain error, where the value error is within a range of variation. For example, if one length value is within 5% error around the other length value, both of the two length values may be referred to as equal to each other.

Specifically, an embodiment of the present disclosure further provides a detection chip, and as shown in FIG. 5, the detection chip 4 includes the microfluidic flow channel structure in any one of the embodiments described above.

Exemplarily, the detection chip may include a liquid inlet and a liquid outlet, the liquid inlet is connected to the liquid inlet section 1, and the liquid outlet is connected to the liquid outlet section 2. The solution for the reaction system may be injected into the liquid inlet through a micro-injection pump or a pipette, then enter the microfluidic flow channel structure, and flows out of the microfluidic flow channel structure through the liquid outlet after reacting in the main chamber 3.

In order to explain the effect of the sample introduction of the microfluidic flow channel structure provided by the present disclosure, the inventor of the present disclosure utilizes a professional fluid simulation software “Ansys Fluent” to perform a simulation evaluation on the actual effect of the microfluidic flow channel structure provided by the present disclosure. Specifically,