JPH029767Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a carotid artery wave detection device, and more particularly to a device capable of detecting blood flow sounds generated by the carotid artery at the same time as the carotid artery waves.

Prior Art It has been known that various medical information can be obtained from the carotid artery in the neck. For example, the waves generated by the heartbeat and propagated to the carotid arteries are generally called carotid artery waves, and by detecting these carotid artery waves and examining their waveforms, it is possible to know the state of cardiac motion. Furthermore, by detecting the blood flow sound generated by the carotid artery, it is possible to know the state of a blood vessel disease such as arterial stenosis.

However, conventional carotid artery wave detection devices generally
A housing having a pressing surface that is pressed onto a carotid artery in the neck, and a compression member that is elastically supported in a state that projects from the pressing surface to press against the carotid artery, and vibrations that are transmitted through the compression member. Although the device is configured to detect carotid artery waves having a relatively low frequency based on the carotid artery waves, it has not been possible to detect blood flow sounds having a higher frequency than the carotid artery waves. In addition, devices such as microphones that detect blood flow sounds can detect blood flow sounds with a relatively high frequency, but cannot detect carotid artery waves with a lower frequency.

For this reason, the area where the carotid artery is close to the skin is narrow, or the neck itself is narrow, so a detection unit for detecting carotid artery waves and a detection unit for detecting blood flow sounds are attached at the same time. This method has the disadvantage that it is not possible to simultaneously measure carotid artery waves and blood flow sounds when it is required to quickly determine the patient's condition. Furthermore, since it is necessary to attach a detection section each time a carotid artery wave is detected and a blood flow sound is detected, the detection operation becomes complicated.

Purpose of the invention The present invention was made in view of the above circumstances, and its purpose is to provide a carotid artery wave detection device that can detect blood flow sounds from the carotid artery at the same time as detecting carotid artery waves. It's about doing.

Structure of the Device In order to achieve this object, a carotid artery wave detection device according to the present invention includes (a) a weight member supported within a housing in a non-contact state with the housing, and (b) the weight member and the housing. and a piezoelectric element that outputs an electrical signal corresponding to the strain generated based on the difference in inertia between the weight member and the housing, and the carotid artery The reason is that the blood flow sounds generated from the blood flow are also detected at the same time.

Effects of the invention With this method, when the blood flow sound generated from the carotid artery, that is, the vibration with a relatively high frequency, is transmitted through the pressing surface of the housing, the piezoelectric element is activated based on the difference in inertia between the housing and the weight member. Distortion occurs in the piezoelectric element, and an electrical signal corresponding to the distortion is output from the piezoelectric element. Since this electrical signal represents a relatively high frequency vibration transmitted through the pressing surface of the housing, that is, blood flow sound, the blood flow sound is detected from this electrical signal. Therefore, according to the carotid artery wave detection device of the present invention, 1
By simply pressing a common housing over the carotid artery, which is a relatively narrow area in the neck of a living body, it is possible to simultaneously detect not only carotid artery waves but also blood flow sounds. Furthermore, there is no need to install a separate detection section for each detection of carotid artery waves and blood flow sounds, which simplifies the detection operation and can reduce the number of detection operations by half compared to the conventional method.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

FIG. 1 is a front sectional view showing an embodiment of the carotid artery wave detection device according to the present invention, and FIG. 2 is an exploded view of its main parts. A first housing member 14 which is a lightweight resin housing and has a cylindrical shape with a bottom and a flange portion 12 on the outer periphery of the bottom surface, a second housing member 16 which has a cylindrical shape with a bottom, and these first housing members 14 and a third housing member 18 that is inserted between and concentrically connects the second housing member 16 and has a hollow cylindrical shape as a whole. First housing member 14
A circular recess 20 is formed concentrically with the housing 10 on the outside of the bottom surface, and a center hole 22 is formed in the center of the recess 20. A compression member 24 is inserted into the housing 10 through the center hole 22.
It is movable concentrically and in the direction of its center line.

The compression member 24 is attached to the first housing member 14
A cylindrical button 28 that is partially accommodated in the recess 20 and the other part protrudes from the pressing surface 26 of the housing 10 that is pressed against the neck; and a bottomed cylindrical button support member 30, which are fixed concentrically to each other by press-fitting the outer peripheral edge of the opening of the button support member 30 into a recess 32 formed in the button 28. There is. Button support member 3
A projection 34 is formed at the center of the outer bottom surface of the button support member 30, and the compression member 24 is screwed into the center of a circular leaf spring 36 by a screw (not shown) in the projection 34 of the button support member 30.

The circular leaf spring 36 has a circular land portion 3 at the center.
8 and a plurality of ring-shaped lands 40 arranged concentrically on the outside of each land 38, 4.
They are connected by a bridge portion 42 formed radially between the two, the direction of vibration is set in the direction of the center line, and the spring constant is made small. The compression member 24 is fixed to the center of the circular land portion 38 as described above, and the opening edge of the first housing member 14 and the third housing member 18 are connected to each other at the outermost land 40.
It is held between a ring-shaped spacer 44 fitted into the inner circumferential surface of. An insertion member 46 is screwed and fixed to the surface of the circular land 38 of the circular leaf spring 36 opposite to the surface to which the compression member 24 is fixed. The insertion member 46 has a fixed shape in which two longitudinal members 48 are superimposed and fixed in a cross-like manner so as to be perpendicular to each other, and one of the longitudinal members 48 is fixed to the circular leaf spring 36. The other longitudinal member 48 of the insertion member 46
is a protrusion 52 that is provided perpendicular to the longitudinal direction of the rectangular leaf spring 50 and extends in a cross shape from the longitudinal center of the leaf spring 50 to both sides.
It is fixed with screws. The leaf spring 50 has ring-shaped spacers 5 at both longitudinal ends thereof.
4, and the spacer 54 is held between the spacer 44 and a stepped surface formed on the third housing member 18 at its outer periphery.

In other words, in this embodiment, the compression member 24 is attached to the housing 10 by the circular leaf spring 36 and the leaf spring 50.
When the compression member 24 is pressed against the neck and the vibrations of the carotid artery are transmitted to the compression member 24, the vibrations cause the insertion member 46 to move. The energy is transmitted to the center of the leaf spring 50 supported by the housing 10 through the cable. As shown in FIG. 2, the back surface of the leaf spring 50 (the surface opposite to the surface to which the insertion member 46 is fixed) to which vibrations are transmitted via the compression member 24 is A strain gauge 56 is attached, and the attached strain gauge 5
The vibration transmitted to the leaf spring 50 by the strain gauge 5 is detected by the strain gauge 5.
Based on the electrical signal outputted from 6, a relatively low frequency carotid artery wave as shown in FIG. 3a is detected. The circular leaf spring 36 restricts the movement of the compression member 24 in the direction of the center line of the housing 10 as described above, and also functions as a damper to damp vibrations transmitted from the compression member 24 to the leaf spring 50. It is being done.

On the other hand, a circular leaf spring 58 having the same shape as the circular leaf spring 36 is provided between the spacer 54 and the stepped surface of the third housing member 18, with the outer periphery thereof being held between them. Further, an outer peripheral portion is provided between the stepped surface of the third housing member 18, which is formed in the opposite direction to the stepped surface on which the circular plate spring 58 is held, and the opening edge of the second housing member 16. A disc-shaped piezoelectric element 60 as a detection element is provided in a state where it is sandwiched. and,
Between the circular leaf spring 58 and the piezoelectric element 60,
A cylindrical weight member 62 having a diameter slightly smaller than the inner diameter of the housing 10 is inserted concentrically with the housing 10 and supported. Circular protrusions 64 and 66 are concentrically formed on the upper and lower surfaces of the weight member 62, respectively, and one of the circular protrusions 64 is screwed and fixed to the center of the circular plate spring 58, and the other circular protrusion 66 is fixed to the center of the circular leaf spring 58 with a screw. It is adhesively fixed to the center of the piezoelectric element 60. Note that, as is clear from this, in this embodiment, the circular leaf spring 58 and the piezoelectric element 60 are connected to the weight member 62.
It constitutes a supporting member.

In this way, if the peripheral edge of the piezoelectric element 60 is fixed to the housing 10 and the weight member 62 is fixedly supported at the center thereof, a relatively high frequency can be transmitted from the pressing surface 26 of the housing 10 pressed against the neck to the housing 10. When high vibrations are transmitted, distortion occurs in the piezoelectric element 60 due to the difference in inertia between the relatively lightweight housing 10 and the weight member 62, and an electrical signal corresponding to the distortion is output from the piezoelectric element 60. Ru.
That is, as shown in FIG. 3b, the electrical signal output from the piezoelectric element 60 represents the blood flow sound with a relatively high frequency, so the blood flow sound is detected from this electrical signal. It is.

Therefore, according to the carotid artery wave detection device of this embodiment, one common pressing surface 26 of the housing 10
By simply pressing the sensor over the carotid artery, which is a relatively narrow area in the neck of a living body, not only the carotid artery wave but also the blood flow sound can be detected at the same time. Therefore, there is no need to install a separate detection section for each detection of carotid artery waves and blood flow sounds, which simplifies the detection operation and reduces the number of detection operations by half compared to the conventional method. Further, in an operating room where it is necessary to quickly grasp the patient's condition, the patient's carotid artery wave and blood flow sound can be detected simultaneously, which is extremely effective.

Note that such a carotid artery wave detection device is attached to the tip of an arcuate arm, such as the carotid artery wave detection device previously proposed by the applicant in Utility Application No. 1983-4129, and is attached to the tip of the arm. It is desirable to be pressed against the neck by elastic force that clamps the neck. By applying pressure based on the elastic force of the arms that hold the neck in this way and maintaining that state, not only can attaching the carotid artery wave detection device to the neck be done with a simple operation, but also noise from the outside can be reduced. This is because it is possible to effectively prevent particles from entering the strain gauge 56 and the piezoelectric element 60 via the housing 10.

Although one embodiment of the present invention has been described above, this is literally an illustration, and the present invention should not be interpreted as being limited to this embodiment.

For example, in the embodiment described above, the pressing surface 26 of the housing 10 is a circular surface formed by adding the flange portion 12 to the bottom surface of the first housing member 14.
A portion of the flange portion 12 corresponding to the upper and lower portions of the neck that are separated in the diametrical direction may be cut out to press the pressing surface 26 more closely against the neck. Note that by cutting out the upper and lower portions of the neck in this way, there is an advantage that patients with narrow necks can also be measured.

Further, in the above embodiment, the compression member 24 and the weight member 62 were provided in the housing 10 so as to overlap in the direction of the center line thereof, but the weight member is formed into a ring shape, and the compression member 62 is placed inside the housing. It is also possible to arrange the carotid artery wave detection device concentrically around the outer periphery of the carotid artery wave detection device, so that the carotid artery wave detection device has a flatter shape than the above embodiment.

Although not listed in detail, it goes without saying that the present invention can be implemented with various modifications and improvements based on the knowledge of those skilled in the art without departing from the spirit thereof.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing an embodiment of the present invention, Fig. 2 is an exploded view of Fig. 1 with the housing and screws removed, and Fig. 3 is a waveform of carotid artery waves and blood flow sounds. It is a figure showing an example. 10: Housing, 24: Pressing member, 26: Pressing surface, 56: Strain gauge, {58: Circular leaf spring, 6
0: piezoelectric element (detection element)} (supporting member), 62:
Weight member.

Claims (1)

[Claims for Utility Model Registration] A housing comprising: a housing having a pressing surface that is pressed onto a carotid artery in the neck; and a compression member that is elastically supported in a state that projects from the pressing surface in order to press against the carotid artery; A carotid wave detection device that detects carotid waves based on vibrations transmitted through a compression member, comprising: a weight member supported within the housing without contacting the housing; and between the weight member and the housing. and a piezoelectric element that outputs an electric signal corresponding to the strain generated based on the difference in inertia between the weight member and the housing, and the piezoelectric element generates an electric signal from the carotid artery based on the electric signal output from the piezoelectric element. A carotid artery wave detection device characterized in that it simultaneously detects blood flow sounds.