JPH0219126Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an ultrasonic blood flow meter probe used for measuring blood flow rate, blood flow velocity, etc. of a living body.

Conventionally, this type of ultrasonic blood flow meter probe (hereinafter simply referred to as a probe) includes a type that sends continuous waves and measures the difference in ultrasonic frequency between the transmitting side and the receiving side.
, a type that attaches to the outer wall of a blood vessel by placing two transducers in the direction of blood flow, and taking advantage of the fact that the propagation time between them changes depending on the flux (blood flow velocity) of the blood, which is the sound propagation medium. , etc.

FIG. 1 is a perspective view of an ultrasonic blood flow meter or probe using a conventional propagation type probe.

In the figure, 1 is the main body of the ultrasonic blood flow meter (hereinafter simply referred to as the main body), which has a built-in oscillator, mixing demodulator, integrator, amplifier, etc., and has a built-in oscillator, mixer demodulator, integrator, amplifier, etc., which transmits the ultrasonic frequency from the transmitted pulse and reaches the receiving side transducer. The difference between the ultrasonic frequency and the ultrasonic frequency is determined and converted into a blood flow rate, which can be directly read by the meter 2. Reference numeral 3 denotes a probe for pinching a pipe (11 to be described later) led out from an artificial dialysis machine (not shown) and extracting a frequency difference corresponding to blood flow. A lead wire 4 connects the main body 1 and the probe 3 and covers signal wires for transmission and reception.

The probe 3 has a lead wire 4 connected to its end as shown in the enlarged perspective view of FIG. and the other clamping piece 8 rotatably supported at. Grooves 9 and 10 are provided in parallel on opposing surfaces of these clamping pieces 5 and 8, respectively. A pipe 11 (shown in phantom) connected to an artificial diaphragm (not shown) can be held between the grooves 9 and 10. 12 is a transmitting ultrasonic transducer, and 13 is a receiving ultrasonic transducer. These transducers oscillate ultrasonic waves to the blood flow passing through the pipe 11 held between the grooves 9 and 10, and receive propagating waves.

However, the above probe had the following drawbacks.

It is not suitable for fixing the clamping piece inside the body with the blood vessel sandwiched between the grooves. For this reason, the probe cannot be worn for a long period of time during and after surgery, and the scope of clinical application is limited.

The present invention was devised in view of the above-mentioned drawbacks, and the object is to obtain a probe for an ultrasonic blood flow meter that can stably measure blood flow rate and blood flow velocity continuously over a long period of time.

Therefore, in the present invention, in an ultrasonic blood flow meter probe having a pair of clamping pieces that clamp blood vessels, each of the clamping pieces has a needle hole for sewing into living tissue. A measurement probe was created.

3 to 5 show a probe showing an embodiment of the present invention.

In the figure, the probe 14 has a pair of clamping pieces 15,
16, and each of the holding pieces 15, 16 is connected by a hinge connection 17 so as to be bendable.
It should be noted that this joining method is not limited to this, and the two holding pieces may be joined by other methods as long as they can be bent.

Next, on the opposing surfaces of the clamping pieces 15 and 16, there are 18 and 19
are provided in parallel, and in the fitted state, a blood vessel insertion hole 20 is formed as shown in FIG. 21,2
Reference numeral 2 denotes a press-fitting portion, which is provided with unevenness at the ends of the holding pieces 15 and 16 facing the hinge joint 17;
As shown in the figure, they can be fitted into each other. Note that the present invention is not limited to these as long as the respective ends of the holding pieces 15 and 16 can be connected.

23 is a transmitting ultrasonic transducer, and 24 is a receiving ultrasonic transducer. These oscillators are groove 1
The surfaces of the holes 8 and 19 are exposed and have a curvature so as not to interfere with the clamping of the blood vessel, forming a part of the blood vessel insertion hole 20.

25 and 26 are lead wires for transmitting ultrasonic transducer 2
3, passes between the hinge joints 17, and is led out to a lead wire 27 to the outside. In this embodiment, the lead wires 25, 2 are connected at the hinge joint.
6 is exposed to the outside, but the hinge joint portion may be made slightly thicker and the lead wire may be buried.

Reference numerals 28 and 29 are portions including the peripheral edges of the holding pieces 15 and 16 with plate-shaped portions located at the farthest positions from each other, and are formed thinner than other portions.

Each of the plate parts 28 and 29 has a needle thread hole 30.
is worn. This hole 30 allows it to be sewn and fixed to the muscle or connective tissue in the body cavity. Incidentally, in the above embodiment, the needle hole was bored in the plate-shaped portion formed on the clamping piece, but the clamping piece may be formed to have a uniform thickness and the needle hole could be punched directly in any part of the clamping piece.

Next, the operation of the above embodiment of the present invention will be explained.

As shown in FIG. 3, a blood vessel (not shown) is held between the grooves 18 and 19 with both holding pieces 15 and 16 bent at the hinge joint 17 and opened. Next, as shown in FIG. 4, put together the clamping pieces 15 and 16, and as shown in FIG.
and 22 are combined. A blood vessel (not shown) is thus accommodated within the blood vessel insertion hole 20. and plate-shaped part 2
The needle holes 30 provided at 8 and 29 are sewn into muscles, connective tissue (not shown), etc. around the blood vessel to be measured using a surgical suture needle and suture thread using the needle holes at appropriate positions.

When the main body 1 oscillates ultrasonic waves in this manner, the ultrasonic waves are transmitted from the transmitting ultrasonic transducer 23 and received by the ultrasonic receiving transducer 24 as they cross a blood vessel (not shown). This signal is lead wire 2
7 to the main body 1.

Using this embodiment in this manner provides the following effects.

Since it is a type in which one end of an integrated clamping piece having a groove is hinged and the other end is fitted, it is easy to fix the blood vessel within the groove even in a narrow surgical field and field of view during surgery.

Furthermore, since the transmission or reception lead wire of one clamping piece is led to the other clamping piece through the hinge joint, it can also serve as reinforcement for the hinge joint.

Furthermore, since the lead wires are commonly led out from one side of the clamping pieces, the lead wires do not wind around the blood vessel to be measured, and occlusion of the blood vessel due to external mechanical twisting can be prevented. Furthermore, nerves and other living tissues are less likely to be damaged, the surgical operation area is reduced, and the invasion of the blood vessels to be measured is reduced.

Ultrasonic transducers for transmitting and receiving are placed facing each other, and the type that clamps blood vessels allows for stable long-term use without affecting transmission and reception even if the new connective tissue of the living body invades when implanted in the body. Measurement is possible.

The entire probe is small and lightweight, reducing costs and making it disposable.
Furthermore, if connected to a telemeter, it is convenient to carry around and is suitable for long-term monitoring and observation of dynamics.

In addition, the mounting operation is simplified and is less invasive, making it possible to measure blood flow stably over a long period of time without anesthesia.

In order to reduce the cost of the probe during extracorporeal circulation operations, it is also possible to continuously measure and monitor the blood flow distribution of each organ in a sterile and safe manner without requiring re-sterilization and reuse.

According to the present invention, since the clamping piece is provided with a needle hole, it is possible to sew a surgical suture thread. Therefore, by sewing and fixing the probe to the connective tissue in the body's lumen, the probe can be made smaller and lighter, and stable blood flow measurement can be performed without disturbing the direction of blood flow velocity.

This is effective in that the conditions for attaching the probe to the blood vessel to be measured can always be kept constant without being affected by body movements or the pulsation of the blood vessel itself.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional extracorporeal ultrasonic blood flow meter and probe, Figure 2 is an enlarged perspective view of the probe in Figure 1, and Figures 3 to 5 are perspective views of the probe of the present invention. , FIG. 3 shows the holding pieces in an open state, FIG. 4 shows them in a slightly closed state, and FIG. 5 shows them in a fitted state. 15, 16... Holding piece, 17... Hinge connection,
18, 19... groove, 20... blood vessel insertion hole, 23...
... Transmitting ultrasonic transducer, 25... Receiving ultrasonic transducer, 27... Lead wire, 28, 29... Plate-shaped portion.

Claims (1)

[Claims for Utility Model Registration] (1) An ultrasonic blood flow meter probe having a pair of clamping pieces that clamp a blood vessel, each of the clamping pieces having a needle hole for sewing into living tissue. An ultrasonic blood flow meter probe characterized by: (2) The pair of clamping pieces each have a plate shape that is thinner at a predetermined part including a part of the peripheral edge than the other part, and this plate-like part has a needle hole for sewing into living tissue. The ultrasonic blood flow meter probe according to claim 1, characterized in that the probe is provided with a perforation.