JPH03112534A - Disposable blood pressure transducer - Google Patents

Abstract

PURPOSE:To prevent affection by moisture and to stably measure a blood pressure by charging a gel-like silicone in a charge cylinder and by applying a rubber-like silicone on the surface of the gel-like silicone which makes contact with liquid to be transmitted. CONSTITUTION:A gel-like silicone 56 serving as a filler is charged in a charge cylinder 52 so that the silicone reaches to a level of substrate 50 and the inner surface of a sensor chip 51 located on the opposite surface of the substrate 50, through a through-hole 50 in the substrate 50. The center part of the surface of the gel-like silicone 56 which makes contact with liquid to be transmitted bulges out into a liquid transmitting passage 53, and is coated with a rubber-like silicone 1 over its entire surface. Accordingly, the gel-like silicone as a filler is prevented from being made into direct-contact with the liquid to be transmitted. Meanwhile, the outer surface 51A of the sensor chip 51 is exposed to the atmosphere under coating thereover with a potting film 55 in order to protect the sensor chip 51 and the like from shocks, vibration, moisture and corrosion, accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disposable blood pressure transducer.

[Conventional technology]

FIG. 3 shows a conventional example.

In the conventional example shown in FIG. 3, a substrate 50 is equipped with circuits (not shown) for temperature compensation, sensitivity calibration, etc., and has a through hole 50A for pressure detection. A sensor chip 51 is airtightly bonded to cover the through hole 50A and electrically connected to a circuit for temperature compensation, sensitivity calibration, etc., and a sensor chip 51 is formed on one side of the substrate 50 so as to include the through hole 50A therein. It is equipped with a housing 57 consisting of a filling cylinder 52 and an infusion passage 53 that are closely joined together.

The sensor chip 51 is electrically connected to a circuit for temperature compensation, sensitivity calibration, etc. by wire bonding using a gold (Au) or aluminum (A2) wire 54.

Furthermore, a potting film 55 is coated on the outer surface 51a of the sensor chip 51 to withstand shock and vibration and to protect the sensor chip 51 and the like from moisture and corrosion.

Furthermore, inside the filling cylinder 52, a through hole 50 of the substrate 50 is provided.
A gel-like silicon 56 is filled up to the inner surface 51b of the sensor chip 51 through A, and the gel-like silicon 56
The surface of the infusion passage 53 comes into contact with the infusion passage 53.

[Problem to be solved by the invention]

However, in the above conventional example, gel silicone is used as a filler to alleviate stress on the sensor chip, so moisture from the infusion is transmitted to the sensor chip via the gel silicone, and the moisture is absorbed by the sensor chip. Therefore, the sensor characteristics change, resulting in the inconvenience that the sensor does not function stably.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a disposable blood pressure transducer that overcomes the disadvantages of the conventional art and has stable functionality even in the presence of moisture.

[Means to solve the problem]

The present invention includes a substrate equipped with circuits for temperature compensation, sensitivity calibration, etc., and having a through hole for pressure detection, and a circuit board that is airtightly bonded to one side of this substrate to cover the through hole, and is equipped with circuits for temperature compensation, sensitivity calibration, etc. The device is equipped with a sensor chip electrically connected to a circuit, and a housing consisting of a filling cylinder and an infusion passage that are tightly joined to one side of a substrate so as to include a through hole therein. Then, a method is adopted in which the inside of the filling tube is filled with gel-like silicone, and rubber-like silicone is applied to the contact surface between the gel-like silicone and the infusion solution. This aims to achieve the above-mentioned purpose.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

Here, regarding the same components as the conventional example described above,
The same symbols will be used.

In the embodiment shown in FIG. 1, a substrate 50 is equipped with circuits (not shown) for temperature compensation, sensitivity calibration, etc., and has a through hole 50A for pressure detection. A sensor chip 51 is airtightly bonded to cover the through hole 50A and electrically connected to a circuit for temperature compensation, sensitivity calibration, etc., and a through hole 5 is formed on one side of the substrate 50.
A filling cylinder 52 tightly joined to contain 0A therein.
and a housing 57 consisting of an infusion passage 53. Then, gel silicone 5 is placed inside the filling cylinder 52.
At the same time, rubber-like silicone 1 is applied to the contact surface between the gel-like silicone 56 and the infusion solution.

Here, the sensor chip 51 is placed on one surface 5.of the substrate 5o.
0a so as to cover the through hole 50A, and the filling cylinder 52 is installed in the through hole 5 on the other surface 50b of the substrate 5o.
The housing 57 is positioned so as to cover 0A.
has been set up. Then, the inside of the filling cylinder 52 is filled with gel-like silicon 56 which is a filler, and is filled through the through hole 50A of the substrate 50 to the inner surface of the substrate 5o and the sensor chip 51 on the opposite side of the substrate 5o. . On the surface of the gel-like silicone 56, which is the filling material, which comes into contact with the infusion liquid, the central part thereof is raised so as to protrude into the infusion liquid passage 53, and the rubber-like silicone 1 is applied over the entire surface. This prevents the gel silicone 56, which is the filling material, from coming into direct contact with the infusion solution. On the other hand, the outer surface 51A of the sensor chip 51 is coated with a botting film 55 for resisting shock and vibration and protecting the sensor chip 51 and the like from moisture and corrosion, and is exposed to the atmosphere.

Further, circuits (not shown) for temperature compensation, sensitivity calibration, etc. on the substrate 50 and the sensor chip 51 are electrically connected by wire bonding using gold (AU) or aluminum (,11) wires 54.

Therefore, when the infusion fluid flows through the infusion passage 53, it applies pressure to the gel silicone 56, which is the filler, through the rubber silicone 1, and the sensor chip 51 detects the pressure from the gel silicone 56, and the infusion fluid The pressure will be measured.

[Second example] Next, a second embodiment will be described based on FIG. 2.

In this second embodiment, a filling cylinder 52 is attached to the surface 50b of the substrate 50 on the side where the sensor chip 51 is mounted, and the sensor chip 51 is contained inside the filling cylinder 52. The inner surface 51b of the sensor chip 51 is exposed to the atmosphere through the through hole 50A of the substrate 50. The other configurations are the same as those of the first embodiment described above.

Even with this configuration, it is possible to have the same effect as the first embodiment described above.

〔Effect of the invention〕

As explained above, in the present invention, the inside of the filling cylinder is filled with gel-like silicone, and rubber-like silicone is applied over the entire front surface of the contact surface between the gel-like silicone and the infusion solution. For this reason, since the rubber-like silicone blocks moisture from the infusion, the sensor chip is prevented from being affected by moisture from the infusion side, making it an unprecedented disposable blood pressure transducer that allows stable pressure measurement. can be provided.

In addition to the above-mentioned effects, in the invention as claimed in claim 3, since there is no protrusion such as a sensor chip or a wire connecting the sensor chip and a circuit on one side of the substrate, the - layer can be easily handled. It has the effect of becoming

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a second embodiment of the invention, and FIG. 3 is a sectional view showing a conventional example.

Claims (3)

[Claims] (1) A substrate equipped with circuits for temperature compensation, sensitivity calibration, etc. and having a through hole for pressure detection, and one surface of this substrate covered with the through hole and bonded airtightly, and electrically connected to the circuit. A disposable blood pressure transducer comprising: a sensor chip connected to a sensor chip; and a housing comprising a filling cylinder and an infusion passage closely joined to one side of the substrate so as to include the through hole therein; A disposable blood pressure transducer characterized in that the inside of the cylinder is filled with gel-like silicone, and the contact surface between the gel-like silicone and the infusion fluid is coated with rubber-like silicone. (2) The sensor chip is closely mounted on one surface of the substrate so as to cover the through hole, and the housing is arranged so that the filling cylinder covers the through hole on the other surface of the substrate. The disposable blood pressure transducer according to claim 1, characterized in that: (3) The sensor chip is closely mounted on one surface of the substrate so as to cover the through hole, and the housing is arranged so that the filling cylinder contains the sensor chip therein. A disposable blood pressure transducer according to claim 1, characterized in that: