JPS6157013B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a CRT display device in a biopsy test that combines an ultrasonic diagnostic device.
The present invention relates to a marker display device capable of displaying a puncture needle marker on the top thereof.

A biopsy test is an essential test for diagnosing various diseases, especially blood diseases, etc., and involves removing body fluids or tissues from bone marrow, lymph nodes, spleen, liver, etc. for diagnostic purposes.

Conventionally, when conducting such tests, an ultrasound diagnostic device is used, and a puncture needle is inserted into the patient's body while observing the cross-sectional image of the patient displayed on the CRT of the display device. The method is widely used. However, the resolution of ultrasound diagnostic equipment is, for example, only about 3 mm in the depth direction and about 2 mm in the spread direction, so it is difficult to clearly see the ultrasound echo image of the puncture needle, which generally has a diameter of 1 mm or less.
It is difficult to display on CRT. Therefore, the person performing the biopsy test (herein referred to simply as the "operator", who is an ordinary doctor) must know exactly where in the body of the subject the tip of the puncture needle for the biopsy test currently being performed is located. It is difficult to know what is happening.

Therefore, there is a possibility of injuring unwanted internal body areas, which is very dangerous for the subject.

An object of the present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to prevent the puncture from occurring on the CRT of the display device of the ultrasonic diagnostic device when performing a biopsy examination in combination with an ultrasonic diagnostic device. The state in which the needle is inserted into the subject's body,
That is, the present invention provides a marker display device that can display a marker indicating the position of the puncture needle.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, an ultrasonic transducer 2 is attached to the tip of a puncture needle 1, and this ultrasonic transducer 2 is connected to a marker generating circuit 3, the details of which will be described later.

In FIG. 2, 7 is a receiver, 8 is a waveform shaping circuit,
A block diagram of a marker generation circuit is shown, which includes a sample hold circuit 9, a 1/2 voltage divider circuit 10, a comparator 11, a rising edge extraction circuit 12, and a mixer circuit 13.

Next, the operation of the biopsy needle and its marker display device according to the present invention will be described.

A cross-sectional image of the subject 5 obtained by bringing the ultrasound probe 4 into close contact with the body surface of the subject 5 and driving the ultrasound transducers arranged on the contact surface of the ultrasound probe 4 with the body surface. is displayed on the CRT of the display device of the ultrasound diagnostic device. After observing the displayed cross-sectional image and confirming the examination site inside the body to be punctured, the puncture needle 1 is inserted into the body corresponding to the scanning area of the ultrasound probe 4. Therefore, the ultrasonic transducer element 2 attached to the tip of the puncture needle 1 receives excitation pulses from the ultrasonic transducer element placed on the surface of the ultrasonic probe 4 that contacts the body. Note that the waveform a in FIG. 3 is a Z signal obtained by detecting and amplifying the received waveform of the ultrasonic probe 4 of the ultrasonic diagnostic apparatus. The single pulse at the left end is called an initial pulse, and its rising edge indicates the point in time when the ultrasonic probe 4 is excited. As mentioned above, the excitation pulse that has propagated through the living body varies depending on the distance from the contact surface of the ultrasound probe 4 with the surface of the subject's body to the ultrasound transducer 2 attached to the tip of the puncture needle 1. After a certain period of time T has elapsed, it is detected by the ultrasonic transducer 2 attached to the tip 1 of the puncture needle. The waveform at that time is the third
This is the waveform shown in FIG. b, and shows a delay of time T from the rise of the initial pulse shown in the waveform a. The signal received by the ultrasonic transducer 2 attached to the tip of the puncture needle 1 is supplied to the receiver 7 shown in FIG. 2. In this receiver 7, the signal detected by the ultrasonic transducer 2 is suitably amplified and then shaped by a waveform shaping circuit 8 shown in FIG. 3 to produce a single pulse as shown in FIG. 3c. Note that the waveform shaping circuit 8
has an appropriate threshold value, and the gain of the receiver 7 is adjusted so that unnecessary single pulses are not generated due to noise or side lobes of the ultrasonic beam from the ultrasonic probe 4. In the ultrasonic diagnostic apparatus, when the excitation pulse from the ultrasonic probe 4 receives reflected waves reflected from various organs and tissues in the living body, the ultrasonic probe 4 detects the object from those organs and tissues. The distance to the contact surface to the body surface is calibrated. Therefore, in the case of the excitation pulse received by the ultrasonic transducer 2 attached to the tip of the puncture needle 1, there is a delay of T time from the rise of the initial pulse, so it is difficult to actually place the marker at the correct position. To generate this, the delay time must be 2T. This completes the distance calibration. The raster sweep waveform shown in FIG. 3d is supplied to the sample hold circuit 9 shown in FIG. 2, and held at the rising edge of the single pulse appearing in the output waveform c from the waveform shaping circuit 8. The output waveform e held in the sampling hold circuit 9 is supplied to the converter 11. In addition, raster sweep waveform d
is also supplied to the 1/2 voltage divider circuit 10 in FIG. 2, where a marker generation sweep waveform having a slope of 1/2 of the raster sweep waveform d and having the same baseline potential as the raster sweep waveform d is supplied. It is transformed into f. This marker generation sweep waveform f is also supplied to the comparator 11 like the held waveform e. The comparator 11 operates when the marker generation sweep waveform f, which is a 1/2 voltage waveform of the raster sweep waveform, and the hold waveform e, which holds the raster sweep waveform, match.
Rising from LOW to HIGH. This comparator 1
1 is extracted by the rising edge extraction circuit shown in FIG. 2 and outputs a waveform g representing a single pulse. Note that the rise of the single pulse of waveform g is delayed by 2T time from the rise of the initial pulse of waveform a. The marker signal waveform g thus obtained is synthesized with the Z signal waveform a by the mixer circuit 13 in FIG. 2 to form a signal waveform h. This composite signal waveform h is supplied to a display device and displayed as a marker 16 on the raster 15 of the CRT 14, as shown in FIG.

As described above, by using the puncture needle for biopsy according to the present invention in combination with an ultrasound diagnostic device, the process of inserting the puncture needle into the subject's body during a biopsy test can be performed by This is obtained as an image, and the tip of the puncture needle is clearly displayed on the CRT in the same way as the cross-sectional image. In other words, the positional relationship between the puncture needle and the internal tissues of the body can be clearly seen on the CRT of the display device.
It can be observed above. Therefore, it is important to conduct a biopsy test to avoid accidentally inserting the puncture needle into an undesired internal area of the body and damaging that area, and to be able to accurately reach the target area to be examined and visually confirm it. Accurate testing can be performed almost regardless of the technique of the operator, and it is also safe for the subject being tested.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a biopsy needle according to an embodiment of the present invention, FIG. 2 is a block diagram of a marker generation circuit according to an embodiment of the present invention, and FIG. 3 is similar to FIG. FIG. 4 is a time chart showing waveforms of various parts of the marker generation circuit shown, and FIG. 4 is a diagram showing an example of marker display according to an embodiment of the present invention. 1...Puncture needle for biopsy examination, 2...Ultrasonic transducer, 3...Marker generation circuit, 7...Receiver, 8...Waveform shaping circuit, 9...Sample hold circuit, 10...1/2 Voltage dividing circuit, 11... Comparator, 12... Rising edge extraction circuit, 13
...Mixer circuit, 14...CRT, 15...Raster, 16...Marker, 17...Initial pulse.

Claims (1)

[Scope of Claims] 1. A puncture needle provided with an ultrasonic transducer, and a marker that displays the position of the puncture needle on the display screen of an ultrasound diagnostic device based on the received signal of the ultrasound transducer. What is claimed is: 1. A marker display device for a puncture needle for biopsy testing, characterized by comprising a generating circuit. 2. The marker display device according to claim 1, wherein the ultrasonic transducer is attached to the tip of the puncture needle. 3. In the marker display device for a puncturing needle for biopsy examination as set forth in claim 1, the marker generating circuit includes a receiving circuit that outputs a received pulse upon reception of the ultrasonic transducer, and an output of this receiving circuit. a sample hold circuit that samples and holds the raster sweep signal of the CRT, a marker generation sweep circuit that halves the raster sweep signal and outputs it, and the output of this marker generation sweep circuit and the sample hold circuit. A comparator that compares the outputs and outputs an inverted output when the former exceeds the latter, a circuit that outputs a marker signal when the output of this comparator is inverted, and a mixer circuit that synthesizes the marker signal of this circuit and the ultrasound image signal. A marker display device characterized by comprising: