JPH0448162Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an indwelling blood pressure monitor that can accurately and continuously measure the blood pressure of critically ill patients, such as those after heart surgery, for long periods of time. It is.

[Conventional technology]

Continuous monitoring of blood pressure is essential for critically ill patients, such as those following cardiac surgery or stroke due to myocardial infarction. In such cases, non-invasive measurement methods performed by wrapping a cuff around the arm are insufficiently accurate, so invasive measurements are usually performed by inserting a catheter or tube with an indwelling needle into the blood vessel. Blood pressure is measured regularly.

An in-body sphygmomanometer that has been commonly used in the invasive blood pressure measurement method is shown in FIG. In other words, the blood pressure monitor punctures and indwells a soft resin or rubber tube called an indwelling needle into a peripheral artery in the arm, etc., and then transmits blood pressure through the indwelling needle to a pressure transducer placed outside the body to measure blood pressure. The idea is to do so. The conventional blood pressure monitor and its method of use will be explained with reference to FIG. Reference numeral 20 denotes an indwelling needle, which is connected to a pressure measurement dome 21 via a pressure measurement tube 22 . A pressure transducer 23 is mounted inside the pressure measuring dome 21. An indwelling needle 20 with an open tip is inserted into an artery 24 of the patient. Indwelling needle 20, pressure measurement tube 2
2 and the pressure measuring dome 21 are filled with physiological saline, and the blood pressure at the tip of the indwelling needle is transmitted to the pressure transducer 23 using the physiological saline as a medium. Physiological saline is indwelling needle 20,
In the pressure measuring dome 21 and the pressure measuring tube 23, it serves as a flushing liquid to prevent blood from coagulating, and is continuously supplied from the container 25. 26 is pressure transducer 2
3 lead wires are further connected to a pressure measuring device 28 via a signal cable 27. The pressure measuring device 28 displays blood pressure as a blood pressure waveform, for example.

Another conventional blood pressure monitor used for invasive blood pressure measurement is one in which an ultra-small pressure transducer 23 is mounted at the tip of an indwelling needle 20, as shown in FIG. can be detected directly within the Note that the same symbols as in FIG. 2 indicate the same parts.

[Problem that the invention attempts to solve]

In the conventional blood pressure monitor shown in Figure 2, blood pressure is transmitted through a long system from the indwelling needle to the pressure transducer, which is filled with physiological saline as a medium. As a result, there was a problem in that the measured blood pressure waveform was distorted. Furthermore, if air bubbles are mixed into the physiological saline in the system, the blood pressure waveform will be further distorted. For this purpose, it is necessary to completely remove air bubbles from the system, but this operation is extremely troublesome.

Other conventional blood pressure monitors shown in Figure 3 can obtain undistorted blood pressure waveforms without complicated operations such as removing air bubbles, but they use ultra-compact pressure transducers with an outer diameter of approximately 1 mm. The device had to be mounted on the tip of the indwelling needle, which is technically extremely difficult, making it extremely expensive. In addition, the characteristics of a pressure transducer tend to gradually drift when measured continuously over a long period of time, so it is desirable to calibrate the measured values at regular measurement intervals. It must be withdrawn from the blood vessel each time it is calibrated. Such an operation is undesirable from the point of view of infection prevention, is practically impossible, and cannot be said to be practical.

[Means for solving the problem]

This invention solves the above problems of conventional blood pressure monitors,
The present invention provides an in-body sphygmomanometer that can measure blood pressure accurately and continuously for a long period of time. a root portion having a lumen provided with a pressure transducer for sensing the pressure of the flushing fluid; an internally inserted tube having an open tip, the other end connected to the root portion, and an interior communicating with the lumen; receiving and processing a pressure signal from the pressure transducer;
This is an indwelling blood pressure monitor consisting of a pressure measuring device that displays the pressure.

The present invention will be explained according to the drawings. FIG. 1 is a schematic diagram of the indwelling blood pressure monitor of the present invention, and also shows the state of use. In FIG. 1, reference numeral 10 denotes a tube to be inserted into the body, which is made of resin such as silicone rubber or fluororesin (eg, tetrafluoroethylene resin, vinylidene fluoride copolymer, etc.). The body insertion tube 10 has an open end and is connected to a root portion 11 at the other end. As shown in FIG. 1, when the in-vivo insertion tube 10 is inserted into the in-vivo blood vessel 12, the root portion 11 is located outside the body. The root portion 11 is provided with a pressure transducer 23, and is continuously supplied with a flushing liquid (for example, isotonic glucose solution, physiological saline, etc.) from a flushing liquid supply device 25 through a flushing liquid tube 13. It has a lumen 12 that is filled. The lumen 12 is in communication with the interior of the intracorporeal insertion tube 10, and
The flushing liquid is applied to the lumen 12 of the root portion 11,
The tube 10 is flushed. A lead wire 26 is connected to the pressure transducer 23 for driving it and for taking out an output electrical signal, and the lead wire 26 is further connected to a pressure measuring device 28 via a cable 27. The pressure measuring device 28 is comprised of a monitor amplifier, which emits an electrical signal for driving the pressure transducer 23, processes the output signal from the pressure transducer 23, and displays blood pressure waveforms and other data. .

The rear end of the root portion 11 has an internal insertion tube 10.
This is the insertion port through which a syringe needle is inserted in order to insert the syringe into the body's blood vessels.

FIG. 4 shows a state in which the injection needle is inserted into the rear end of the root portion 11. In FIG. 4, 40 is a syringe;
41 is the rear end of the root portion 11, and the tip 42 of the injection needle
protrudes from the open end of the intracorporeal insertion tube 10. The same numbers as in FIG. 1 indicate the same parts. Furthermore, the injection needle is inserted into the body insertion tube 10, the tip of the injection needle is projected from the open end of the body insertion tube, and then the injection needle is inserted into the body blood vessel. The rear end portion 41 of the root portion 11 is made of soft rubber to prevent blood from leaking out of the body from the injection needle's penetration port after the injection needle is removed. That is, by using soft rubber, the through hole is automatically closed after the injection needle is removed.

[Effect]

A method of measuring blood pressure using the blood pressure monitor of the present invention will be explained together with the function of the blood pressure monitor with reference to FIG. 5.

The injection needle (not shown) is sequentially inserted from the rear end of the root portion 11 into the internal cavity and into the body insertion tube 10 until the tip of the injection needle 40 protrudes from the open end of the body insertion tube 10. When (Figure 4)
The injection needle is inserted into the body blood vessel together with the body insertion tube 10. After that, if you just pull out the syringe needle,
As shown in FIG. 5, the intracorporeal insertion tube 10 is placed in a blood vessel, and the root portion 11 is located outside the body.

Next, the flushing liquid is supplied from the flushing liquid supply device to the lumen of the root portion 11 through the supply tube 51 to fill the lumen and the inside of the body insertion tube 10 with the flushing liquid. The flushing liquid supply device has the structure and function described below.

The tube 53 has a pressure bag 51 for forcibly discharging the flushing liquid such as physiological saline contained in the container 50, and a drip tube 52 for determining the flow rate of the flushing liquid flowing out from the container 50. The liquid is led to the flush liquid tube 13.

There is a clamp 55 for adjusting the flow rate in the middle of the tube 53.
The flow rate limiter 56 adjusts the flow rate to an extremely small amount. The reason for adjusting the flow rate to be extremely small is to prevent blood from entering the interior of the body insertion tube 10 from the open end of the body insertion tube 10 and coagulating, and to ensure that there is no problem in blood pressure measurement.

Blood pressure is transmitted from the open end of the body insertion tube 10 to the pressure transducer 23 provided in the inner cavity of the root portion 11 using flushing liquid as a medium, and the pressure transducer 23 converts the blood pressure into an electrical signal and converts the blood pressure into an electrical signal. 26, is processed by a pressure measuring device 28 via a cable 27, and blood pressure waveforms and other data are displayed.

〔Example〕

In FIG. 1, the root part 11 is made of transparent resin so that it can be confirmed whether there are air bubbles in the inner cavity, and the body insertion tube 1 is connected to the root part 11.
No. 0 is made of fluororesin, which causes less thrombus formation even when left in the blood vessel for a long time. A diffusion type semiconductor pressure transducer was used as a pressure transducer element provided inside the lumen. The flushing liquid supply device is shown in FIG. The signal from pressure transducer 23 is connected to cable 2
7, is processed in a monitor amplifier which is a pressure measuring device 28, and is displayed as a blood pressure waveform.

[Effect of idea]

By using the indwelling blood pressure monitor of the present invention, blood pressure can be easily and accurately measured continuously over a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing the state of the in-body blood pressure monitor of the present invention when measuring blood pressure, Fig. 2 is a schematic diagram showing the state of a conventional blood pressure monitor when measuring blood pressure, and Fig. 3 is a schematic diagram showing the state of the conventional blood pressure monitor when measuring blood pressure. FIG. 4 is a side view of the indwelling blood pressure monitor of the present invention, and FIG. 5 is a perspective view showing the state of the blood pressure monitor when measuring blood pressure. 10...Body insertion tube, 11...Root part,
12...Inner lumen, 13...Flushing liquid tube, 20...Indwelling needle, 21...Dome for pressure measurement,
22... Pressure measurement tube, 23... Pressure transducer, 24... Artery, 25... Container, 26
... Lead wire, 27 ... Signal cable, 28 ...
Pressure measuring device, 40...Syringe, 50...Container, 5
1... Pressure bag, 52... Drip tube, 53... Tube, 56... Flow restrictor.

Claims (1)

[Scope of utility model registration request] a root portion having a lumen filled with flushing liquid supplied from a flushing liquid supply device and provided with a pressure transducer for sensing the pressure of the flushing liquid, and a rear end portion of which is made of soft rubber;
an intracorporeal insertion tube whose distal end is open, whose other end is connected to the root portion, and whose interior is connected to the lumen, and which receives and processes pressure signals from the pressure transducer;
An indwelling blood pressure monitor consisting of a pressure measuring device that displays information.