JPH0349259B2 - - Google Patents

Description

[Detailed Description of the Invention] [Summary] A probe attached to a blood vessel for blood flow measurement, which has a built-in part containing a blood flow measurement transducer that is slidable with respect to a blood vessel clamping part, and
It is configured to sandwich a blood vessel between a pair of concave surfaces, enabling accurate blood flow measurement.

[Industrial application field]

The present invention relates to a blood vessel attachment probe for measuring blood flow conditions for medical purposes.

Ultrasound is widely used in fields such as communications and medicine, and progress in application in the medical field is particularly remarkable.

An example of the use of ultrasound in the medical field is a probe attached to a blood vessel that measures the state of blood flow within a blood vessel, which is often used during surgery, and is therefore easy to operate and provides accurate measurements. It is necessary that there be.

[Conventional technology]

Conventionally, a probe for attaching to a blood vessel (hereinafter referred to as a probe) has a one-piece structure as shown in FIG. 7, has a notch A of the outside diameter of the blood vessel at its tip, and is a transducer for outputting/receiving ultrasound. Built-in 1-1. A signal line 1-2 for transmitting a blood flow signal detected by the transducer 1-1 is led out from the rear end of the probe, and a signal line 1-2 for transmitting a blood flow signal detected by the transducer 1-1 is led out from the rear end of the probe. Windows 1-3 are provided for outputting/receiving ultrasonic waves.

To measure blood flow using this probe, a blood vessel is placed against the notch A, the blood vessel is accommodated in the notch A against the elasticity of the blood vessel, and the probe is attached. Thereafter, the transducer 1-1 outputs ultrasonic waves, and the transducer 1-1 receives the ultrasonic waves reflected by the blood flow to measure the state of blood flow in the blood vessel.

[Problem that the invention seeks to solve]

However, in the conventional blood vessel attachment probe, the blood vessel protrudes from the notch A due to blood flow and blood pressure, deforming the blood vessel shape. As a result, there was a problem that an accurate blood flow state could not be measured and was inaccurate.

The present invention was created in view of these points, and an object of the present invention is to provide a blood vessel attachment probe that has a simple configuration and can perform accurate measurements.

[Means for solving problems]

The built-in part includes a built-in transducer that outputs/receives ultrasonic waves, and a blood vessel clamping part into which the built-in part is slidably fitted in the longitudinal direction of the built-in part, one end in the length direction of the built-in part. is formed with a first blood vessel abutting concave portion having a substantially semicircular cross section, and a second blood vessel contacting portion having a substantially semicircular cross section is formed on the semicircular arc-shaped projecting portion at one end of the blood vessel clamping portion, facing the concave portion.
A blood vessel contacting concave portion is formed, and when the tip of the semicircular arc-shaped protruding portion is brought into contact with one end of the built-in portion, the first and second blood vessel contacting concave portions are attached to the blood vessel to be attached. This is a probe for attachment to a blood vessel, characterized in that it is configured to have a diameter of .

[Effect]

The built-in part containing the transducer can be slid against the blood vessel clamping part, and by the sliding of the built-in part, the blood vessel to be measured for blood flow is held between the pair of blood vessel abutting concave parts. to hold. Therefore, blood vessels do not protrude from the probe, making it possible to accurately measure blood flow.

〔Example〕

FIG. 1 is a perspective view of an embodiment of a probe for attaching to a blood vessel according to the present invention. It consists of a holding part 2.

FIG. 2 is a side view of the built-in part of the present invention shown in FIG. 1. The built-in part 1, which has a substantially cylindrical shape, has a structure in which a portion 1-4 of the cylinder is formed into a flat surface in the longitudinal direction. , the flat part 1-4 is the built-in part 1
When the built-in part 1 is slid in its length direction, rotation of the built-in part 1 is prevented.

A groove-like concave surface 1-5 with a semicircular cross section having the same radius as the blood vessel is formed at one end (left end) of the internal part 1.
A window 1-3 is opened in the center of the tube -5, and a convex portion 1-6 for fixing the blood vessel clamping portion 2 is provided near the other end (right end).

The fixing protrusion 1-6 is made of a plate spring, for example, and is fitted into a recess provided on the inner surface of the blood vessel clamping part 2 to prevent the built-in part 1 from sliding due to the pressure of the blood vessel. At the same time, if the built-in part 1 is pulled with the required tension, it becomes slidable. The grooves 1-7 are for sliding the built-in portion 1, and are provided for a jig to be described later.

As shown in FIG. 1, the blood vessel clamping part 2 into which the built-in part 1 fits is provided with a concave surface 2-1 corresponding to the concave surface 1-5 of the built-in part 1, and the fixing convex part 1-6 is fixed thereto. In this state, the concave surfaces 1-5 and 2-1 form the outer diameter of the blood vessel. The blood vessel clamping part 2 is provided with a notch 2-2 for holding the blood vessel clamping part 2.

Incidentally, as shown in FIG. 6, a built-in portion 1' without the groove 1-7 may be used, but the probe is intended for implantation in animal experiments, etc., and is intended only for attachment (manual removal is required).

In addition, although the concave surfaces 1-5 and 2-1 have been described as being orthogonal to the length directions of the internal part 1 and the blood vessel clamping part 2, respectively, there is no problem even if they are not perpendicular to each other, and they can be adjusted as appropriate depending on the location where they are used. This becomes useful as a crossing angle.

FIG. 3 is a perspective view of a jig for operating the probe of the present invention.
It is composed of a clip-shaped grasping section 4 that holds the -7 in between, and a finger operating section 5 with the center of the grasping section 4 fixed. It is connected by a freely slidable shaft 6 that passes through the finger operation section 5.

The clip-shaped grasping part 4 always has the tip 4-1 pinching the groove 1-7, releases the pinching by applying pressure to the other end 4-2, and the tip 4-1 grips the groove 1-7.
It will move away from -7.

FIG. 4 is a perspective view showing another example of the groove configuration of the operating jig for the probe of the present invention, and the difference from the jig shown in FIG. 3 is that the attachment and detachment of the probe is performed in one movement.
That is, the holding part 3-1 that holds the probe is divided into two parts, and a tweezers-shaped grasping part 4-3 is provided inside.

The grasping section 4-3 is configured to slide inside the holding section 3-1 when the operating section 5-2 is moved in the left-right direction in the figure, and furthermore, the grasping section 4-3 slides between the inside of the holding section 3-1 and the grasping section 4.
Various uneven portions are provided on the outer sliding surface of -3.

FIG. 5 is a configuration diagram of the main parts of the jig shown in FIG. A flat protrusion 3-3 and a chevron-shaped protrusion 3-4 are provided on the inner surface. On the other hand, the tip 4-4 of the grasping portion 4-3 is formed in a “dog” shape as shown in the figure.
A flat protrusion 4-5 is provided on the outside of -3.

Their relative positional relationship is such that when the grasping part 4-3 is slid to the left side in the figure and the tip 4-4 is positioned to the left of the protrusion 3-3, the flat protrusion 4-5 becomes the protrusion 3-3. 4 will be expanded. Therefore, when the flat protrusions 4-5 push the protrusions 3-4 apart, the pair of tips 3-2 are opened outward, and the pair of tips 4-4 are also opened.

Next, when the grasping part 4-3 is moved to the right in the figure, the flat protrusion 4-5 comes off from the protrusion 3-4, the tip 3-2 closes inward, and the protrusion 3-3 closes the flat protrusion 4-5. As a result, the tip 4-4 also closes inward. Note that when the tip 4-4 is on the left side of the projection 3-3 and the tip 3-2 is in an open state, the concave surfaces 1-5 and 2-1 of the probe are in a circular shape with the outer diameter of the blood vessel.

Therefore, in order to attach the probe to the blood vessel, it is only necessary to move the grasping section 4-3 from side to side.

FIG. 6 is a perspective view of a jig used only when attaching the probe to a blood vessel, and as in FIG. 5, when the flat protrusion 4-5 of the protrusion 3-3 comes into contact with the
-2 becomes open. What is different from the jig shown in FIG. 5 is that a coil spring 4-6 is built into the gripping portion 4-3, and the gripping portion 4-3 is always located on the right side as shown in the figure.

When using it, coil spring 4-6
Move the grasping part 4-3 to the left against the
Open it, insert the blood vessel clamping part 2 and the built-in part 1',
The concave surfaces 1-5 and 2-1 in an open state holding the probe by reducing the pressure of the coil spring 4-6
A blood vessel is inserted between the concave surface 1- and the grasping portion 4-3 is operated against the coil spring 4-6.
The blood vessel is held between 5 and 2-1, and the grasping part 4
If you continue the operation in -3, the probe will separate from the jig.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to accurately measure the state of blood flow with an extremely simple configuration.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the probe for attachment to a blood vessel of the present invention, FIG. 2 is a side view of the built-in part of the present invention shown in FIG. 1, and FIG. 3 is a perspective view of the operating jig of the probe of the present invention. , FIG. 4 is a perspective view of another configuration example of the operating jig for the probe of the present invention, FIG. 5 is a configuration diagram of the main parts of the jig shown in FIG. 4, and FIG. 6 is only when attached to a blood vessel. A perspective view of the jig used, and FIG. 7 is a partially cutaway perspective view of a conventional probe. In the figure, 1 and 1' are internal parts, 2 is a blood vessel clamping part, 3 is a holding part, 4 is a grasping part, and 5 is a finger operation part.

Claims (1)

[Claims] 1. Consisting of a built-in part 1 containing a transducer that outputs/receives ultrasonic waves, and a blood vessel clamping part 2 into which the built-in part 1 is fitted so as to be slidable in its length direction. A first blood vessel abutting concave portion 1-5 having a substantially semicircular cross section is formed at one end in the length direction of the built-in portion 1, and a semicircular arc-shaped protruding portion at one end of the blood vessel holding portion 2 is formed. , a second blood vessel abutting concave part 2-1 having a substantially semicircular cross section is formed opposite to the concave part 1-5, and the tip of the semicircular arc-shaped protruding part is connected to the built-in part 1.
A blood vessel attachment device characterized in that the first and second blood vessel abutting concave portions 1-5, 2-1 are configured to have the diameter of the blood vessel to be attached when brought into contact with one end. probe.