JPH0517043Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention can accurately measure the blood pressure of critically ill patients, such as those after heart surgery, and can be used for long periods of time without the need to pull out the indwelling needle from the blood vessel during zero point calibration. This invention relates to an indwelling blood pressure monitor that can continuously measure blood pressure.

[Prior Art] Continuous monitoring of blood pressure is essential for critically ill patients, such as those after heart surgery or myocardial infarction. In such cases, there is a non-invasive measurement method in which a cuff is wrapped around the arm, but this method does not provide sufficient accuracy, so it is difficult to measure by placing a catheter or indwelling needle inside the blood vessel. The commonly used method is to measure blood pressure invasively by inserting a tube.

The conventional method commonly used for invasive blood pressure measurement is to puncture and indwell a soft resin tube called an indwelling needle into a peripheral artery such as the arm, and then place the blood pressure outside the body through the indwelling needle. It is guided to a pressure transducer to measure blood pressure. The conventional blood pressure monitor used in this method is shown in FIG.

The conventional blood pressure monitor and its method of use will be explained below with reference to FIG.

Reference numeral 50 denotes an indwelling needle, which is connected to a pressure measurement dome 51 via a pressure measurement tube 52 . A pressure transducer 53 is mounted inside the pressure measuring dome 51. An indwelling needle 50 with an open tip is inserted into an artery 54 of the patient.
The interior of the indwelling needle 50, the pressure measurement dome 51, and the pressure measurement tube 52 are filled with physiological saline, and the blood pressure at the tip of the indwelling needle is transmitted to the pressure transducer 53 using the physiological saline as a medium. Physiological saline serves as a flushing liquid to prevent blood from coagulating within the sphygmomanometer, and is continuously supplied from the container 55. 56 is a lead wire of the pressure transducer 53, which is further connected to a pressure measuring device 58 via a signal cable 57. The pressure measurement device 58 displays blood pressure as a blood pressure waveform, for example. Another conventional blood pressure monitor used for invasive blood pressure measurement has an indwelling needle 5 as shown in FIG.
An ultra-compact pressure transducer 53 is mounted on the tip of the blood pressure transducer, and blood pressure can be directly detected within the blood vessel. Note that in FIG. 4, the same reference numerals as in FIG. 3 indicate the same parts.

[Problems to be solved by the invention] The conventional blood pressure monitor shown in Figure 3 transmits blood pressure through the medium of physiological saline, which is filled in a long system from the indwelling needle to the pressure transducer. , is affected by the compliance of the indwelling needle and the pressure measurement tube in the middle, and as a result, the measured blood pressure waveform is 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 4 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 was technically extremely difficult, and it had to be 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 measured values at regular measurement intervals. It must be removed from the blood vessel. 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 Problems] The present invention solves the problems of the conventional blood pressure monitors described above, allows accurate blood pressure measurement, and eliminates the need to pull out the indwelling needle from the blood vessel each time zero point calibration is performed. The present invention provides an indwelling blood pressure monitor that can continuously measure blood pressure over time, and its gist is that a needle insertion hole is provided on the central axis, and a flush fluid communication path extends from the needle insertion hole to the outer periphery. a cylindrical center body that extends through the surface and is provided with a flushing liquid bypass groove on the periphery; a rubber-shaped center body that is provided at the rear end of the center body and forms the rear end wall of the injection needle insertion hole; a switching part consisting of a knob having a needle insertion part made of a substance; and a flush liquid passage groove into which the central body is rotatably inserted and which communicates with the flush fluid communication passage at a certain rotational position of the switching part. a flush liquid supply port that penetrates the wall from the outside and communicates with the flush liquid passage groove; and an atmospheric pressure that penetrates the wall from the outside and communicates with the flush liquid passage groove via a pressure transducer. a flush liquid outlet that penetrates the wall from the outside and communicates with the flush liquid passage groove via the flush liquid bypass groove at a certain rotational position of the switching part; A tube-shaped indwelling device having a root portion having an attachment port that communicates with the distal end of the hole, and a flush fluid tube connected to the flush fluid supply port, the rear end of which is attached to the attachment port and whose tip is open. An indwelling blood pressure monitor consisting of a needle and a needle.

The present invention will be explained below with reference to the drawings. FIG. 1 is an overall external view showing a state in which a syringe needle is inserted from the syringe insertion part of the indwelling blood pressure monitor of the present invention, and A and B show a side view and a rear view, respectively. FIG. 2 shows a sectional view of the base of the indwelling blood pressure monitor of the present invention.

In FIGS. 1A and 1B, the reference numeral 30 denotes an indwelling needle having a tube shape and made of resin such as silicone rubber or fluororesin (eg, tetrafluoroethylene resin, vinylidene fluoride copolymer, etc.).

The indwelling needle 30 has an open tip and the other end connected to the root portion 20. 10 is a switching part, and when using the blood pressure monitor of the present invention, insert the needle 17 of the syringe 16 through the knob 15 at the rear of the switching part, and take out the tip of the needle 17 from the open tip of the indwelling needle 30. , is inserted into the blood vessel together with the indwelling needle 30. After that, the injection needle 17 is removed.

In FIG. 2, the switching unit 10 includes a cylindrical center body 13 and a knob 15 provided at the rear end of the center body 13. A needle insertion hole 11 is provided on the central axis of the center body 13, and a flush fluid communication path 18 is provided that penetrates from the needle insertion hole 11 toward the outer peripheral surface, and a flush fluid bypass groove 12 is further provided on the periphery. is provided.

The knob 15 is provided with a needle insertion portion 14 made of a rubber-like material and forming the rear end wall of the needle insertion hole 11 .

The root portion 20 has a lumen 22 into which the central body 13 is rotatably inserted, and a flush fluid passage groove 21 is provided on the inner wall surface of the lumen 22. The flush liquid passage groove 21 connects the flush liquid communication passage 18 at a certain rotational position of the switching section 10.
As a result, it also communicates with the injection needle insertion hole 11 and the indwelling needle 30. Lumen 2
The wall 23 of 2 is provided with a flush liquid supply port 24, an atmospheric pressure communication port 26, and a flush liquid outlet 27, which penetrate the wall 23 from the outside.
The flush liquid supply port 24 connects to the flush liquid passage groove 21, and the atmospheric pressure communication port 26 connects to the flush liquid passage groove 2 via a pressure transducer 25.
1 and the flush liquid outlet 27 communicate with the inner cavity 22, respectively.

The flushing fluid passage groove 21 and the flushing fluid outlet 27 are communicated via the flushing fluid bypass groove 12 when the switching portion 10 is placed in another rotational position.

The flushing fluid tube 40 is connected to the flushing fluid supply port 24, and the indwelling needle 30 is attached to the attachment port 28 provided at the distal end of the root portion 20. 29 is pressure transducer 2
This is the lead wire connected to 5.

[Operation] The operation of the present invention will be explained below with reference to the drawings.

When inserting the indwelling needle 30 of the blood pressure monitor of the present invention into a blood vessel in the body, the procedure is as follows.

As shown in FIGS. 1 and 2, the injection needle 17 is inserted into the injection needle insertion part 14 provided in the knob part 15 of the switching part 10. Since the injection needle insertion part 14 is made of a rubber-like substance, the injection needle 17 can be inserted easily. Inserted hypodermic needle 17
passes through the injection needle insertion hole 11 provided in the central body 13 of the switching unit 10, the attachment port 28 provided at the tip of the root portion 20, and the internal indwelling needle 30,
It comes out from the opened tip of the indwelling needle 30. The injection needle 17 and the indwelling needle 30 are inserted into a blood vessel in the body. The outer wall surface of the injection needle 17 and the tip of the indwelling needle 30 are smoothly continuous so as not to interfere with insertion into the body.

Thereafter, by pulling out only the injection needle 17 from the rear of the switching section 10, the intracorporeal indwelling needle 30 is indwelled in the blood vessel. After the injection needle 17 is removed, the injection needle insertion part 14 is covered with a rubber-like substance (for example, silicone rubber,
Since the needle is made of fluorocarbon rubber, etc., the hole through which the injection needle is inserted automatically closes, preventing blood from leaking.

Next, the effect during blood pressure measurement will be explained.

FIG. 5 is a cross-sectional view of the sphygmomanometer of the present invention during blood measurement, in which A is a vertical cross-sectional view and B is a cross-sectional view at A shown in the vertical cross-sectional view A.

The switching unit 10 is set at a certain rotational position to communicate the flush fluid communication channel 18 provided in the central body 13 with the flush fluid communication groove 21, and the blood pressure is adjusted from the opened tip of the indwelling needle 30 to the inside of the root portion 20. Physiological saline is supplied from the flush fluid tube 40 to transmit it to the pressure transducer 25 installed to partition the flush fluid channel groove 21 and the atmospheric pressure communication port 26, and the flush fluid channel groove 21,
The flush fluid communication path 18, the injection needle insertion hole 11, and the indwelling needle 30 are filled with physiological saline.

In order to prevent blood from entering the internal indwelling needle 30 from the open tip of the internal indwelling needle 30 and coagulating, physiological saline is continuously supplied in extremely small amounts during the measurement. The flow rate is such that it does not affect the blood pressure measurement itself.

Normally, blood pressure is measured based on atmospheric pressure, so the back surface of the pressure transducer 25 is maintained at atmospheric pressure through the atmospheric pressure communication port 26. Incidentally, the zero point of the pressure transducer 25 fluctuates due to changes in temperature and the like. That is, the electrical signal output when the blood pressure is zero (which should normally be zero) fluctuates. Therefore,
When measuring continuously over a long period of time, it is necessary to check for fluctuations in the zero point at appropriate time intervals. For this purpose, a pressure transducer 25
The pressure applied to the tube must be at atmospheric pressure, that is, the blood pressure is zero. In the present invention,
It has a mechanism for changing the flow path of the flushing fluid (physiological saline) during blood pressure measurement and zero point calibration.

The operation during zero point calibration will be explained below.

FIG. 6 is a cross-sectional view of the blood pressure monitor of the present invention at the time of zero point calibration, in which A is a vertical cross-sectional view and B is a cross-sectional view at B shown in the vertical cross-sectional view.

By turning the knob 15, the switching unit 10
When the is set to another rotational position, the flush fluid passage groove 2
1 is shielded from the injection needle insertion hole 11 and communicated with the flush fluid bypass groove 12 instead. Further, the flush liquid bypass groove 12 is connected to a flush liquid outlet 27. At this time, the flush fluid passage groove 21 is isolated from blood pressure and is released to atmospheric pressure through the flush fluid outlet 27.

As described above, in the present invention, zero point calibration can be performed at any time during blood pressure measurement by simply turning the knob 15 of the switching unit 10, making it very easy to use.

Further, the base portion 20 and the switching portion 10 are made of, for example, transparent resin so that it can be confirmed whether or not there are air bubbles in the flush liquid passage groove 21 or the injection needle insertion hole 11. Examples of elements used in the pressure transducer 25 include a diffusion type semiconductor pressure transducer.

[Embodiment] FIGS. 4 and 5 show an embodiment of the present invention, in which a flush liquid passage groove 21 provided on the inner wall surface of the lumen 22 provided in the root portion 20 is aligned with the axis of the lumen 22. This is an example in which they are provided along the direction.

A groove 19 is provided on the periphery of the center body 13 in the switching portion 10 to engage with a protrusion 201 provided on the inner wall surface of the inner cavity 22 to prevent the center body 13 from coming off from the inner cavity 22. There is. Protrusion 201
may be a screw pin that penetrates and is screwed into the wall 23 from the outside of the root portion 20, and whose tip portion protrudes from the inner wall surface of the lumen 22. In this case, by adjusting the degree of protrusion of the tip of the screw pin, the center body 13 can be removed from the inner cavity 22 or
It is possible to fix the rotational position of the

The inner diameter of the needle insertion hole 11 provided on the central axis of the central body 13 is tapered at its rear end, so that the tip of the injection needle inserted from the needle insertion part 14 can be smoothly inserted. I will guide you as much as possible.

6 and 7 show another embodiment of the present invention, in which a flush fluid passage groove 21 is provided along the circumferential direction on the inner wall surface of the lumen 22. FIG. 6 shows the state at the time of blood pressure measurement, and FIG. 7 shows the state at the time of zero point calibration. In FIGS. 6 and 7, A is a vertical cross-sectional view, and B is a cross-sectional view at C and D shown in the vertical cross-sectional view A.

The reference numerals in Figs. 6 and 7 indicate the same parts as those in Figs. 4 and 5.

[Effects of the invention] According to the present invention, blood pressure can be measured with high accuracy, and blood pressure measurement and zero point calibration can be easily performed by simply switching the switching unit, so the indwelling needle can be used each time zero point calibration is performed. There is no need to pull out the blood from the blood vessel, and it can be measured continuously for a long period of time.

[Brief explanation of drawings]

FIG. 1 is an external view of the in-body blood pressure monitor of the present invention;
Figure 2 is a longitudinal sectional view of the base, Figures 3 and 4.
The figure is a cross-sectional view of a conventional blood pressure monitor, FIGS. 5 and 6 are longitudinal and cross-sectional views of an embodiment of the present invention, respectively, and FIGS. 7 and 8 are respectively of another embodiment of the present invention. They are a vertical cross-sectional view and a cross-sectional view. 10...Switching part, 11...Syringe needle insertion hole,
12...Flush fluid bypass groove, 13...Central body, 14...Needle insertion part, 15...Knob, 1
8... Flush liquid connection path, 20... Root portion, 2
1...Flush liquid passage groove, 22...Inner cavity, 23
...Wall, 24...Flush liquid supply port, 25...
Pressure transducer, 26...Atmospheric pressure connection port,
27...Flush liquid outlet, 28...Installation port, 30...Internal indwelling needle, 40...Flush liquid tube.

Claims (1)

[Claims for Utility Model Registration] An indwelling blood pressure monitor consisting of a switching part 10, a base part 20, a flushing fluid tube 40, and an indwelling needle 30, wherein the switching part 10 has a needle insertion hole 11 at its center. a cylindrical central body 13 provided on the shaft, provided with a flush fluid communication path 18 extending from the injection needle insertion hole 11 toward the outer circumferential surface, and provided with a flush fluid bypass groove 12 on the periphery; centrosome 1
A needle insertion part 1 made of a rubber-like material is provided at the rear end of the injection needle insertion hole 11 and forms the rear end wall of the injection needle insertion hole 11.
4, and the base portion 20 has a flush fluid passage groove 21 into which the center body 13 is rotatably inserted and which communicates with the flush fluid communication passage 18 at a certain rotational position of the switching portion 10. a flush liquid supply port 24 that penetrates the wall 23 from the outside and communicates with the flush liquid passage groove 21; and a flush liquid supply port 24 that penetrates the wall 23 from the outside and communicates with the flush liquid passage groove 21; Atmospheric pressure communication port 26 communicates via transducer 25 and wall 2 from the outside.
3 and communicates with the flush liquid passage groove 21 via the flush liquid bypass groove 12 at another rotational position of the switching section 10; The flushing fluid tube 40 is connected to the flushing fluid supply port 24, and the indwelling needle 30 has a rear end attached to the mounting port 28. An indwelling blood pressure monitor that is tube-shaped and has an open tip.