JPS62503079A - pressure sensing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] pressure sensing device Technical field TECHNICAL FIELD The present invention relates to a pressure sensing device, particularly for medical use, i.e. to detect the flow of a certain amount of drug into the body of a patient. The present invention relates to a pressure sensing device suitable for use in a dosing meter for administering to the body.

Background technology The patient's body includes a drug fluid source, a drug flow control device, and a drug flow control device and a drug flow control device. drug flow by means of an intravenous administration set including tubing connected between the patients; body is introduced. This flow control device directs drug fluid into the tubing at a desired rate. amount of fluid being delivered; however, any defects between the flow control device and the patient may Interfere with desired administration.

Problems that arise with the use of intravenous administration sets include, for example, when the administration needle Errors in position relative to the patient and kinking or crushing of the tube when inserted into the and other disabilities. Such conditions may occur if the patient is being fed with a flow control device. The desired amount of drug fluid may not be injected, or the drug fluid may disperse into the tissue and cause serious damage. It is very dangerous as it can cause medical problems.

Monitor the pressure within the intravenous administration set (■ administration set) downstream of the flow control device, Devices are known which generate an output signal when the pressure exceeds a predetermined maximum value. This outfit The arrangement is described in U.S. Pat. No. 4,394°862 and includes, for example, It cooperates with a pressure transducer that engages the tube. This converter outputs a continuous pressure monitoring circuit that generates a warning signal when the pressure exceeds a predetermined maximum value will be monitored. Warning signals are used to stop fluid flow and generate a warning sound .

Pressure sensing devices have also been proposed to detect increased pressure in parts of the patient's body. Ru. U.S. Patent No. 3,704,708 has a flexible membrane at one end and a pressure responsive transducer at the other end. arterial blood pressure measurement and observation device with a housing having a sealed cavity in It is listed. This device is positioned over the patient's arterial blood vessel and the output from the transducer is Displayed using a suitable display means.

U.S. Pat. A pressure sensing device is described which is implanted between the steps and cemented in plaster. this pressure The force-sensing device can be used in storage and display cavities separated by frangible discs or inflatable bags. It is a branch capsule with a location. This storage cavity is filled with a colored fluid, e.g. A clogged tube creates excess pressure between the skin and the plaster, and this excess pressure Destruction of the disc or expansion bag to display colored fluid with transparent or translucent walls Flow into the void. This viewing cavity thus allows visual inspection of the colored fluid.

U.S. Patent No. 4,316,466 has a variable volume chamber formed with highly flexible walls. The present invention discloses an integrated pressure sensing means. This wall expands with increased internal pressure. child the associated switch in the electrical circuit when the wall expands to a predetermined volume representing a predetermined fluid pressure. activating the switch means, which de-energizes the fluid supply means and further increases the pressure. Prevent it from curling up.

U.S. Patent No. 4,146,028 requires that the drug ■ Use an expansion chamber or accumulation tube in the administration set to temporarily store and contain the drug fluid. ing. The purpose of this arrangement is to retain drug fluid until the obstruction or difficulty is removed. with the goal of delivering the desired amount of fluid to the patient without attendant intervention. Ru.

Demonstration of invention The purpose of the present invention is to: ■ be highly reliable and easy to handle; ■ be ideal and simple to use with administration sets; It is to provide a warning device. Furthermore, the object of the present invention is to: It is also important to provide a warning device whose parts are disposable and can be replaced fairly easily. .

Another object of the invention is to provide rapid and positive activation of the warning as soon as a predetermined pressure is reached. The purpose is to provide equipment. A further objective was to eliminate errors caused by mechanical factors.■ It is an object of the present invention to provide a device that indirectly contacts the fluid within the administration set.

According to the invention, a pressure sensing member is formed having first and second contours; The member can be moved from a first to a second profile by application of an increased differential pressure on the member; has an unstable contour intermediate the first and second contours, and therefore 2 contours is achieved.

Preferably, the pressure sensing member has a closed end and a peripheral radial extension at the other end. It is a flexible thin film that advantageously includes a cylindrical portion.

Of course, the present invention also provides that the pressure sensing member is a pressure sensing device cooperating with a pressure sensing member disposed at the end of the tubular arm communicating with the Also includes.

This device has a T or Y joint, with the end of the joint formed with a Royer-type connector. You may be

The pressure sensing device may include a sensor that detects the contour of the pressure sensing member.

This sensor may be an optical sensor.

Brief description of the drawing The invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a sectional view of the device of the invention in the non-operating state, and FIG. 2 is the device in the operating state. FIG. 2 is a cross-sectional view similar to FIG. 1;

BEST MODE FOR CARRYING OUT THE INVENTION The pressure sensing device shown in the drawing is located downstream of the flow control device in conjunction with the tubing of the administration set. It is equipped with a single-shaped part lO that moves, and this part is attached to a tube connected to a flow control device. The male Royer connector 11 is attached to the tube connected to the patient's body. A female Royer type connector 12 is provided. In this case, the male Royer type connector A flange is formed at the tip of the connector, and the female Royer connector has a flange that engages with the flange. A recessed, flexible inner wall is formed. Therefore, in operation, this pressure sensing device does not impede fluid flow to the patient.

The side tube 13 has a cylindrical portion 16 closed at one end 17 and a radially outer portion around the tip. A Royer-type connector 14 is formed having a laterally extending flange portion 18 . child A Royer type connector 14 supports the molded thin film 15. The thin film 15 is made of plastic. made from a flexible, liquid-impermeable material such as a rubber or rubber material; In most cases, the material used is rubber latex.

In the illustrated embodiment, the pressure sensing device includes a light source 20 and a light detector 21. It is connected to the body 19 of the optical sensor. This optical sensor is connected to the warning sound generator 24. It is connected to an electronic control circuit 23 connected thereto. The main body 19 has a Royer type connector 14. A Royer type connector to be fitted is formed, and the flange portion 18 of the membrane 15 is attached to the shoulder 25. is engaged with and held.

When excessive pressure occurs in the fluid passing through this device, the fluid pressure in arm 13 increases, and at a certain predetermined critical pressure, the membrane 15 snaps into the position shown in FIG. Invert). Therefore, the thin film I5 is placed between the positions shown in FIGS. 1 and 2. There is no position to set.

In the position shown in Figure 2, the light beam of the optical sensor is blocked and this 23 and causes the warning sound generator 24 to generate a warning sound.

The pressure that snaps the thin film 15 depends on the characteristics of the thin film 15, such as elasticity, material thickness, and In selecting the optimum value for each of various factors including the dimensions and cross-sectional shape of the beam 13, Therefore, it is determined in advance.

If desired, multiple devices with different pressure activation values can be used to It is designed so that the most suitable device can be selected for each application.

■The maximum pressure supported by normal operation of the administration set has been determined through research and is usually The starting pressure is 300 mo+) (g).

All other parts, not including the sensing device, are made as single-use units and kept under sterile conditions. It is clear that it can be manufactured quite easily.

Many variations to the specific embodiments described above are possible within the scope of the invention. Ru. The shape of the membrane 15 may vary as long as the snapping characteristics are retained.

The sensor can be of any type, but the best is an electron beam device connected to a control unit. is preferred. The control unit will sound the aforementioned audible warnings and provide visual warning lights such as warning lights. An output signal can be generated that emits a target alarm. Furthermore, instead of this, the control unit These signals can either turn off the flow control device to prevent further build-up of pressure, or ■Used to relieve pressure inside administration set tubes International research report w″嵨11″＝　PCT/GB　86100318ANNEX　To　fHE　 INTERNATIONAL 5EARCHREPCjRT ON

Claims (8)

[Claims] 1. A pressure sensing member is formed having first and second contours, the member being Application of the differential pressure increased above can move from the first to the second profile, and this member and has an unstable contour in the middle of the second contour, so that the transition from the first to the second contour is Pressure sensing member with which rapid movement is achieved. 2. A member according to claim 1, wherein said member is a flexible thin film. 3. The member preferably has a cylindrical portion having a closed end and a peripheral radial extension at the other end. The member according to claim 1, provided for. 4. A pressure sensing member communicates with a fluid conduit connected to tubing of the IV administration set. with a pressure sensing member according to claim 3 arranged at the end of the tubular arm. Pressure sensing device. 5. 5. The pressure sensing device according to claim 4, wherein said device is provided with a T or Y joint. . 6. Pressure sensing according to claim 4, wherein the device is formed by a Royer type connector. Device. 7. The pressure sensing device is formed with a sensor that detects the contour of the pressure sensing member. A pressure sensing device according to claim 6. 8. 7. The pressure sensing device according to claim 6, wherein said sensor is an optical sensor.