CN102018532A - Continuous wave probe structure for ultrasonic Doppler - Google Patents

Abstract

In order to solve the problems in using of an ultrasonic Doppler probe based on horseshoe-shaped double array elements, the invention discloses a continuous wave probe structure for ultrasonic Doppler. Two emitting and receiving piezoelectric crystals on the probe are crossly distributed as the chart 1 shows. When the direction or angle of the probe is changed, the emitting crystal and the receiving crystal can be effectively coupled with a measured target.

Description

A kind of continuous wave sonde configuration that is used for ultrasonic doppler

One, technical field

The present invention relates to a kind of hyperacoustic pair of array element ultrasonic probe that receive and launch, particularly a kind of ultrasonic probe that is used to survey human bloodstream.

Two, background technology

Doppler ultrasound wave measurement blood flow rate has become medical treatment and has gone up the goldstandard of measuring blood flow rate, in the Doppler ultrasound system, ultrasonic probe can transform the ultrasonic signal and the signal of telecommunication mutually, works to transmit and receive ultrasonic signal, for the performance of whole system very big influence is arranged.What wherein play the conversion of signals effect is piezoquartz.Piezoquartz has piezoelectric effect, when producing strain under stress, will produce polarization or electric field in the crystal, can be used to receive ultrasound wave; Vibrate and after piezoquartz is subjected to the electric pulse excitation, can produce, send ultrasound wave, ultrasound wave is decay rapidly in air, so when measuring, all need special-purpose ultrasonic coupling agent to make the ultrasound wave that transmits between probe and the tested blood vessel directly avoid air, only avoid the area that air makes contact surface contact with measured target and just be effective coupling area of popping one's head in and contacting by couplant.

A kind of structure of ultrasonic commonly used is a double crystal probe at present, cries again and cuts apart probe, promptly in a probe two blocks of piezoquartzes is arranged, an emission ultrasound wave, and another piece receives ultrasound wave.Sketch map as shown in Figure 1, crystalline structure such as Fig. 2 (a).And this structure, the transonic that can cause transmitting and receiving causes the intensity instability that transmits and receives apart from different, and meeting changes along with the variation of the contact point of probe and test surface.Have only when contact point and crystallinely cut apart when place at two, the effect that just can allow emission receive is the same, and as shown in Fig. 2 (b) during situation, the difference maximum that transmits and receives.This often needs rotating detector just can reach reasonable emission or reception when just making practical operation, is not easy to use.

Three, summary of the invention

In the general probe is two blocks of semicircular piezoquartzes, and when causing probe orientation and change in location, transmitting and receiving crystalline effective coupling area can alter a great deal, and makes emission reception instability.The present invention is directed to the problems referred to above, designed a kind of new double crystal probe structure, the two blocks of piezoquartzes that transmit and receive on it is characterized in that popping one's head in are interspersed, and when probe orientation or angle variation, guarantee effective coupling area of transmitting crystal and receiving crystal to greatest extent.Probe adopts this structure, and when the contact point of probe and test surface changed, emission and the signal strength differences of accepting were little.

Four, description of drawings

Fig. 1 is the double crystal probe sketch map

Fig. 2 (a) is an ordinary ultrasonic probe piezoquartz structure chart

Fig. 2 (b) is an ordinary ultrasonic probe emission reception sketch map

Fig. 3 (a) is a probe piezoquartz structure chart among the present invention

Fig. 3 (b) is a probe emission reception sketch map among the present invention

Five, the specific embodiment

When making probe, two blocks of piezoquartzes on the probe are processed into are interspersed, for example be lattice-shaped or sinusoidal shape.Be exactly a kind of mode that is interspersed that is lattice-shaped shown in Fig. 3 (a), make that the crystalline effective area that transmits and receives can not change when probe orientation or angle changed.Other parts of popping one's head in get final product according to original manufacture method processing.When the crystal on the probe was this structure, the effect that transmits and receives was shown in Fig. 3 (b), and the signal intensity that transmits and receives can difference not occur with the variation of head angle.

Claims (2)

1. continuous wave sonde configuration that is used for ultrasonic doppler, the two blocks of piezoquartzes that transmit and receive on it is characterized in that popping one's head in are interspersed, and when probe orientation or angle changed, the effective area of transmitting crystal and receiving crystal was constant.

2. the continuous wave sonde configuration that is used for ultrasonic doppler as claimed in claim 1 is characterized in that transmitting crystal and receiving crystal are lattice-shaped and are interspersed.

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