CN114587417B - Catheter sheath and imaging device - Google Patents
Catheter sheath and imaging device Download PDFInfo
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- A61B8/4483—Constructional features of the ultrasonic, sonic or infrasonic diagnostic device characterised by features of the ultrasound transducer
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Abstract
The invention provides a catheter sheath and an imaging device, wherein the catheter sheath utilizes a related theory to design a multilayer acoustic artificial structure on the catheter sheath, and combines an ultrasonic surface to perform focusing regulation and control on an acoustic beam of an ultrasonic transducer, so that the acoustic beam transmitted by the ultrasonic transducer generates a focusing effect at a specific position, thereby improving the transmission efficiency of acoustic wave energy of the ultrasonic transducer, and improving the transverse resolution and the signal-to-noise ratio in the depth direction. That is, the practical material parameters and thickness parameters of the catheter sheath are calculated by applying particle reinforced polymer matrix composite materials with different sound velocity distributions based on the abnormal acoustic effect of the super surface and by referring to the existing acoustic micro-nano structure design paradigm; by researching the regulation and control mechanism of the ultrasonic surface and the acoustic artificial focusing structure on the high-frequency ultrasonic transducer, corresponding acoustic artificial focusing structure parameters are reasonably and optimally designed, and the focusing regulation and control on the ultrasonic beam of the ultrasonic transducer is used for improving the imaging signal-to-noise ratio and the transverse resolution.
Description
The present application claims priority from a domestic application entitled "a sheath and imaging device" filed by the chinese patent office on 26/11/2021 with the application number 202111424530.5, the entire contents of which are incorporated herein by reference.
Technical Field
The invention relates to the technical field of medical equipment design, in particular to a catheter sheath and an imaging device.
Background
Atherosclerosis is a disease that can cause death at present, and is basically a lesion of the arterial vessel wall caused by an atherosclerotic plaque.
Biomedical imaging techniques such as angiography, CT angiography (CTA), and enhanced magnetic resonance angiography (CE-MRA) have been rapidly developed in order to assess the morphology and severity of atherosclerotic lesions.
However, angiography and CTA are an x-ray based invasive technique requiring injection of contrast agent in the blood vessel; these contrast agents may cause severe allergic reactions, which are harmful to renal patients.
In contrast, CE-MRA technology is safer because CE-MRA has no ionizing radiation and the contrast agent is less toxic; however, the main disadvantages of CE-MRA are higher cost and longer processing time.
Further, intravascular Ultrasound (IVUS) is a catheter-based technique that has been increasingly used for clinical atherosclerosis detection and diagnosis to overcome the drawbacks of imaging modalities such as angiography; in particular, IVUS has the advantage of being low cost, not requiring radiotherapy and contrast agents, and allows physicians to obtain detailed, accurate images of diseased vessels from within arteries, and simultaneously assess their size.
However, one of the drawbacks of IVUS is its limited image resolution, which depends on the wavelength of the acoustic beam; this is a major drawback of diagnosing plaque compared to other imaging; higher resolution IVUS images can be obtained by using high frequency ultrasound transducers, but at the cost of limited penetration depth.
In recent years, colleges such as southern california university, northern kastate university, toronto university, canada, and the like have developed a variety of ultrasound transducers for endoscopic imaging of the cardiovascular system; wherein, the high-frequency ultrasonic transducer is used for high-resolution imaging, but the imaging depth is shallow; although the low-frequency ultrasonic transducer can improve large-depth imaging, the resolution is sacrificed at the same time; that is, these results in low signal-to-noise ratio and poor image quality of the ultrasound imaging at deep sites; in these studies, the high-frequency ultrasonic transducers all adopt a planar structure, and the imaging lateral resolution is still low due to the influence of the size of the focal spot.
In addition, by adopting a mode of pressing and focusing the transducer or changing an acoustic artificial structure on the surface of the transducer, although the size and the focal length of a focal spot can be changed, the preparation process is complex, the precision of the preparation process cannot be well guaranteed, and the ultrasonic transducer is easily damaged in the process of manufacturing the ultrasonic transducer, so that the production yield of the ultrasonic transducer is greatly reduced.
Disclosure of Invention
In view of this, in order to solve the above problems, the present invention provides a catheter sheath and an imaging device, the technical solution is as follows:
an introducer sheath, comprising:
a sheath body having an acoustically artificial structural portion;
the acoustic artificial structure portion having a hollow region and a sidewall structure surrounding the hollow region;
in the first direction, the side wall structure sequentially comprises a focusing lens simulating acoustic artificial structure and a super structure simulating groove acoustic artificial structure;
wherein the first direction is a direction from the central region to the sidewall structure;
the focusing lens imitating acoustic artificial structure is used for focusing acoustic beams;
the artificial structure is used for regulating and controlling the focusing of the sound beams.
Preferably, in the above-described catheter sheath, the catheter sheath body is a hollow cylindrical catheter sheath.
Preferably, in the above-mentioned catheter sheath, the ultrasound array element in the catheter sheath is located in the region of the acoustic artificial structure portion.
Preferably, in the catheter sheath, the maximum width of the ultrasonic array element is 2a;
the inner diameter of the acoustic artificial structure part is r 0 ；
Wherein r is 0 Is greater than a.
Preferably, in the above-described catheter sheath, the refractive index of the focusing lens acoustic prosthesis in any one cross section of the acoustic prosthesis portion is equal in a cross section perpendicular to the axial direction of the catheter sheath.
Preferably, in the above-mentioned catheter sheath, the refractive index of the focusing lens-imitating acoustic artificial structure of the acoustic artificial structure portion in the cross section perpendicular to the axial direction of the catheter sheath is different at different heights, and the refractive index distribution is based on central symmetry.
Preferably, in the above-described catheter sheath, the refractive index gradually increases from the center to both sides.
Preferably, in the above catheter sheath, the focusing lens simulating acoustic artificial structure is formed by combining a solid aluminum ball and a polymer material.
Preferably, in the catheter sheath, the super structure-imitating acoustic artificial structure is formed by combining a solid aluminum ball and a high polymer material.
An imaging device comprising the catheter sheath of any of the above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a catheter sheath, which comprises: a sheath body having an acoustically artificial structural portion; the acoustic artificial structure portion has a hollow region and a sidewall structure surrounding the hollow region; in the first direction, the side wall structure sequentially comprises a focusing lens simulating acoustic artificial structure and a super structure simulating groove acoustic artificial structure; wherein the first direction is a direction from the central region to the sidewall structure; the focusing lens imitating acoustic artificial structure is used for focusing acoustic beams; the super-structure-imitated groove acoustic artificial structure is used for improving the focusing degree of the acoustic beam focusing.
The catheter sheath utilizes a related theory to design a multilayer acoustic artificial structure on the catheter sheath, and combines an ultrasonic surface to focus and regulate an ultrasonic transducer beam, so that the ultrasonic transducer beam transmitted by the ultrasonic transducer beam generates a focusing effect at a specific position, thereby improving the transmission efficiency of the acoustic energy of the ultrasonic transducer and improving the transverse resolution and the signal-to-noise ratio in the depth direction.
That is, the practical material parameters and thickness parameters of the catheter sheath are calculated by applying particle reinforced polymer matrix composite materials with different sound velocity distributions based on the abnormal acoustic effect of the super surface and by referring to the existing acoustic micro-nano structure design paradigm; by researching the regulation and control mechanism of the ultrasonic surface and the acoustic artificial focusing structure on the high-frequency ultrasonic transducer, corresponding acoustic artificial focusing structure parameters are reasonably and optimally designed, and the focusing regulation and control on the ultrasonic beam of the ultrasonic transducer is used for improving the imaging signal-to-noise ratio and the transverse resolution.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic view of a catheter sheath according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of an introducer sheath along a vertical axis according to an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating relative positions of an ultrasound array element and a catheter sheath according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional equivalent structure of a catheter sheath according to an embodiment of the present invention;
FIG. 5 is a schematic view of an equivalent structure of a cross-sectional view of another catheter sheath provided in accordance with an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of another alternative introducer sheath along a vertical axis according to an embodiment of the invention;
fig. 7 is a schematic axial cross-sectional view of a catheter sheath according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Based on the content recorded in the background of the present application, in the inventive process of the present application, the inventor finds that, compared with the conventional ultrasonic endoscopic catheter, the high-frequency ultrasonic transducer has a small volume and a multi-layer complex structure, so the design and manufacturing process thereof is a big bottleneck restricting the development of the high-frequency imaging technology.
In addition, most of the ultrasonic transducers adopt a planar unfocused piezoelectric array element, and the low lateral resolution and the poor signal-to-noise ratio in the depth direction of the piezoelectric array element are another big bottleneck limiting the quality of high-frequency ultrasonic images.
In order to improve the focusing effect of the high-frequency ultrasonic transducer, a mode of pressing and focusing the transducer or changing an acoustic artificial structure on the surface of the transducer is generally adopted, although the size and the focal length of a focal spot can be changed, the preparation process is complex, the precision of the preparation process cannot be well guaranteed, and the ultrasonic transducer is easily damaged in the process of manufacturing the ultrasonic transducer, so that the production yield of the ultrasonic transducer is greatly reduced.
Specifically, a concave surface is formed on the surface of the transducer by pressing metal balls with different radiuses on the transducer for a long time, and the radius of the used metal ball is the focal length of the existing focusing transducer; for the high frequency Shan Zhenyuan ultrasonic transducer, due to its small size, if it is subjected to a press focusing operation, it generally causes its ceramic plate to be broken.
The ceramic wafer is used as an element for generating ultrasonic waves by the transducer, and damage of the ceramic wafer can greatly influence the quality of received ultrasonic echoes, so that the imaging effect of the transducer is greatly reduced; if the ceramic chip is seriously damaged, the transducer can not be used, and the survival rate of the transducer can not be ensured.
Based on this, in the application, a multi-layer acoustic artificial structure is designed on a catheter sheath by using a relevant theory, and focusing regulation and control are performed on an ultrasonic transducer beam by combining an ultrasonic surface, so that the ultrasonic transducer beam transmitted by the ultrasonic transducer beam generates a focusing effect at a specific position, the transmission efficiency of the acoustic energy is improved, and the transverse resolution and the signal-to-noise ratio in the depth direction are improved.
That is, the practical material parameters and thickness parameters of the catheter sheath are calculated by applying particle reinforced polymer matrix composite materials with different sound velocity distributions based on the abnormal acoustic effect of the super surface and by referring to the existing acoustic micro-nano structure design paradigm; by researching the regulation and control mechanism of the ultrasonic surface and the acoustic artificial focusing structure on the high-frequency ultrasonic transducer, corresponding acoustic artificial focusing structure parameters are reasonably and optimally designed, and the focusing regulation and control on the ultrasonic beam of the ultrasonic transducer is used for improving the imaging signal-to-noise ratio and the transverse resolution.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 1, fig. 1 is a schematic structural view of a catheter sheath according to an embodiment of the present invention; referring to fig. 2, fig. 2 is a schematic cross-sectional view of a catheter sheath along a vertical axis according to an embodiment of the present invention.
The catheter sheath includes:
a sheath body having an acoustically artificial structural portion.
The acoustic artificial structure portion has a hollow region and a sidewall structure surrounding the hollow region.
In the first direction, the side wall structure sequentially comprises a focusing lens simulating acoustic artificial structure and a super-structure simulating groove acoustic artificial structure.
Wherein the first direction is a direction pointing from the central region to the sidewall structure.
The focusing lens imitating acoustic artificial structure is used for focusing acoustic beams.
The super-structure-imitated groove acoustic artificial structure is used for carrying out sound beam focusing regulation and control.
In this embodiment, optionally, the catheter sheath body is a hollow cylindrical catheter sheath; as shown in fig. 1, an acoustic artificial structure part is arranged in a certain area of the catheter sheath body, and the other area is only required to be a conventional catheter sheath; as shown in fig. 2, the acoustic artificial structure part has a hollow area and a sidewall structure surrounding the hollow area, and the sidewall structure has a certain thickness, and the sidewall structure is mainly modified in the present application, specifically:
as shown in fig. 2, the sidewall structure sequentially includes an artificial focusing lens acoustic structure and an artificial super-structure groove acoustic structure, and the artificial focusing lens acoustic structure is used for focusing an acoustic beam; the artificial structure is used for regulating and controlling the focusing of the sound beams.
Therefore, the acoustic artificial structure of the focusing lens is not limited to the focusing of the sound beam on a certain plane any more, and the effect is mainly the focusing of a rotating circular ring.
Referring to fig. 3, fig. 3 is a schematic diagram illustrating relative positions of an ultrasound array element and a catheter sheath according to an embodiment of the present invention.
The ultrasound array elements in the catheter sheath are in the region of the acoustic artificial structure part.
That is to say, when the supersound array element in the pipe sheath rotates arbitrary angle, can both realize focusing and collimation, this pipe sheath's setting is easily other devices combination uses and can produce new technological effect, provides a new thinking for three-dimensional ultrasonic imaging.
As shown in fig. 3, the ultrasonic array element is generally disposed on the probe, and the position of the ultrasonic array element on the probe is fixed, one end of the probe is connected to a torque spring, the torque spring is connected to an external driving motor, and the torque spring is driven by the external driving motor to rotate, so as to drive the ultrasonic array element on the base to rotate clockwise or counterclockwise; the coaxial cable is connected with the ultrasonic array element through the hollow area of the torsion spring as shown in figure 3.
Therefore, the catheter sheath utilizes a related theory to design a multilayer acoustic artificial structure on the catheter sheath, and combines an ultrasonic surface to focus and regulate a sound field of an ultrasonic transducer (ultrasonic array element), so that the sound field transmitted by the catheter sheath generates a focusing effect at a specific position, the transmission efficiency of sound wave energy of the catheter sheath is improved, and the transverse resolution and the signal-to-noise ratio in the depth direction of the catheter sheath are improved.
Alternatively, in another embodiment of the present invention, referring to fig. 4, fig. 4 is a schematic cross-sectional equivalent structure diagram of a catheter sheath provided in an embodiment of the present invention; referring to fig. 5, fig. 5 is an equivalent structural schematic diagram of a cross-sectional view of another catheter sheath provided in accordance with an embodiment of the present invention.
Wherein the maximum width of the ultrasonic array element is 2a.
The inner diameter of the acoustic artificial structure part is r 0 。
Wherein r is 0 Is greater than a.
In this embodiment, the inventor considers the difficulty of the actual processing of the metamaterial, and has simplified the design in this application, and the maximum width of the ultrasonic array element is set to be 2a, and the inner diameter of the catheter sheath with the acoustic artificial structure part is set to be r 0 The catheter sheath with the acoustic prosthesis section has a thickness d in the first direction and a height h in the axial direction.
The transverse focusing of the catheter sheath with the acoustic artificial structure part is realized by a circular ring structure, and the inner diameter r needs to be ensured 0 Slightly larger than a, the measurement standard may be determined according to actual conditions, and is not limited in the embodiments of the present invention.
When the thickness d of the catheter sheath with the acoustically artificial structure portion in the first direction is designed to vary from a/10 to a/2, the depth of focus f varies from 8a to 1a, and the focal spot radius delta is smaller than a/5.
The axial focusing of the catheter sheath with the acoustic artificial structure part is realized by means of gradient refractive index, and a vertical plane through which the sound beam passes can be equivalent to a plano-concave acoustic lens.
In particular, the refractive index of the focusing lens acoustic prosthesis in any one cross-section of the portion of the acoustic prosthesis in a cross-section perpendicular to the axial direction of the catheter sheath is equal.
In particular, the refractive index of the focusing lens-simulating acoustic artificial structure of the acoustic artificial structure part on the cross section with different heights z is different in the cross section perpendicular to the axial direction of the catheter sheath, and the refractive index distribution is based on central symmetry.
And, the refractive index gradually increases from the center to both sides.
That is, the refractive index of the center of the sheath with the acoustically artificial structure portion is the lowest and the refractive index of the edge faces is the highest.
Alternatively, referring to fig. 6, fig. 6 is a schematic cross-sectional view of another catheter sheath provided in an embodiment of the present invention along a vertical axis; referring to fig. 7, fig. 7 is a schematic axial cross-sectional view of a catheter sheath according to an embodiment of the present invention.
As shown in fig. 6 and 7, the focusing lens simulating acoustic artificial structure is formed by combining a solid aluminum ball and a high polymer material; the super-structure-imitated groove acoustic artificial structure is formed by combining a solid aluminum ball and a high polymer material.
It should be noted that, in the embodiment of the present invention, the design of the gradient refractive index is realized by changing the filling ratios of the solid aluminum spheres and the polymer material.
It should be noted that, in the embodiment of the present invention, the solid aluminum ball is only an optimal choice, and has better effect compared with other metal balls or metals with other shapes.
As can be seen from the above description, based on the catheter sheath provided in the embodiments of the present application, the propagation region of the acoustic wave in the artificial focusing lens acoustic structure is annular in the lateral direction and rectangular in the axial direction.
As can be known from acoustic simulation, the propagation length of a main lobe in the transverse direction is shorter, the propagation length of a side lobe in the transverse direction is longer, and the propagation distance s range of an acoustic beam in an acoustic artificial structure of the focusing-simulated lens is as follows:
firstly, the refractive index n of the cross section of the center point in the axial direction is determined 0 And a thickness d; when the sound wave is incident to the inner side of the acoustic artificial structure of the focusing-imitating lens, the incident angle of the main lobe is smaller, and the incident angle of the side lobe is larger; according to the total reflection conditions:
n≥n 0 ≥sin 45° (2)
obtaining a suitable refractive index n by simulation 0 And the thickness d enables the main lobe and the side lobe to be superposed as much as possible after being refracted by the inner side surface of the acoustic artificial structure of the focusing-imitating lens, and the side lobe reaches the vicinity of a desired focus.
Wherein, in the formula (3)
The angle of incidence of the side lobe when the side lobe is refracted on the inner side surface of the acoustic artificial structure of the focusing lens can be 60 degrees or 45 degrees;
n represents the refractive index of the current catheter-sheath interface;
alpha represents the incident angle when the surface outside the acoustic artificial structure of the focusing lens is refracted;
beta represents the field angle when the surface outside the acoustic artificial structure of the focusing lens is refracted;
gamma denotes the angle of refraction at which the outer surface of the focusing lens-emulating acoustic artifact refracts.
The depth of focus and the thickness approximately meet the following requirements through calculation:
wherein, a 1 (n),a 2 (n),a 3 (n) is a coefficient relating to the refractive index n.
The focal zone radius can be estimated by the opening angle β.
In order to increase the variation range of the gradient refractive index in the axial direction, n is generally taken 0 ＝0.75。
The refractive index n (z) in the axial direction is then determined.
Knowing the refractive index of the cross section where the center point in the axial direction is located:
n(z＝0)＝n 0 (5)
the depth of focus for the lateral focus and the depth of focus for the longitudinal focus should be equal, the rectangular area of width s is equivalent to a plano-concave lens of focal length f, the thickness of the edge with respect to the center is:
it follows that the refractive indices of the base and top surfaces (i.e. the two most peripheral side cross-sections of the acoustic artificial structure portion) are:
the refractive indexes of the other regions are solved according to the mortise and tenon surfaces, wherein k is an undetermined coefficient:
n(z)＝n 0 cosh(kz)+Δn(z) (8)
because the refractive indexes of different heights z are different, the focusing depth in the transverse direction is different, in order to improve the collimation characteristic, annular grooves (namely, an ultra-structure groove simulating acoustic artificial structure) are formed on the outer side of the focusing lens simulating acoustic artificial structure, and all the grooves are periodically distributed in the axial direction and are equivalent to a binary periodic function with the refractive index delta n (z).
The acoustic anomalous transmission phenomenon occurs when the depth h and geometry (period d, width a of the annular groove) of the annular groove are close to the wavelength of the acoustic wave; the working frequency is determined by the depth h of the acoustic channel, and the standing wave condition is met:
therefore, the specially designed catheter sheath utilizes the related theory to design a multilayer acoustic artificial structure on the catheter sheath, and combines the ultrasonic surface to perform focusing regulation and control on the ultrasonic transducer sound beam, so that the sound beam transmitted by the ultrasonic transducer generates a focusing effect at a specific position, the transmission efficiency of the sound wave energy is improved, and the transverse resolution and the signal-to-noise ratio in the depth direction are improved.
That is, the practical material parameters and thickness parameters of the catheter sheath are calculated by applying particle reinforced polymer matrix composite materials with different sound velocity distributions based on the abnormal acoustic effect of the super surface and by referring to the existing acoustic micro-nano structure design paradigm; by researching the regulation and control mechanism of the ultrasonic surface and the acoustic artificial focusing structure on the high-frequency ultrasonic transducer, corresponding acoustic artificial focusing structure parameters are reasonably and optimally designed, and the focusing regulation and control on the ultrasonic beam of the ultrasonic transducer is used for improving the imaging signal-to-noise ratio and the transverse resolution.
Optionally, in accordance with all the above embodiments of the present invention, in another embodiment of the present invention, there is provided an imaging apparatus, which includes the catheter sheath described in the above embodiments.
The imaging device has at least the same technical effect as the catheter sheath.
The catheter sheath and the imaging device provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
It should be noted that, in this specification, each embodiment is described in a progressive manner, and each embodiment focuses on differences from other embodiments, and portions that are the same as and similar to each other in each embodiment may be referred to. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A catheter sheath, the catheter sheath comprising:
a sheath body that is a hollow cylindrical sheath and that has an acoustically artificial structural portion;
the acoustic artificial structure portion having a hollow region and a sidewall structure surrounding the hollow region;
in the first direction, the side wall structure sequentially comprises a focusing lens simulating acoustic artificial structure and a super structure simulating groove acoustic artificial structure;
wherein the first direction is a direction from the hollow region to the sidewall structure;
the focusing lens imitating acoustic artificial structure is used for focusing acoustic beams;
the artificial acoustic structure imitating the super-structure groove is used for carrying out sound beam focusing regulation and control;
the ultrasonic array element in the catheter sheath is positioned in the area of the acoustic artificial structure part.
2. The catheter sheath of claim 1, wherein the ultrasound array elements have a maximum width of 2a；
The acoustic artificial structure portion has an inner diameter ofr 0 ；
Wherein,r 0 is greater thana。
3. The introducer sheath of claim 1, wherein the refractive index of the focusing lens acoustic artifact is equal in any cross-section of the portion of the acoustic artifact in a cross-section perpendicular to the axial direction of the introducer sheath.
4. The introducer sheath of claim 1, wherein the refractive index of the focusing lens-mimicking acoustic artificial structure of the portion of the acoustic artificial structure in a cross-section perpendicular to the axial direction of the introducer sheath is different at different heights, and the refractive index profile is based on central symmetry.
5. The catheter sheath of claim 4, wherein the refractive index increases gradually from the center to both sides.
6. The introducer sheath of claim 1, wherein the focusing lens acoustic artifact is formed from a combination of a solid aluminum ball and a polymer material.
7. The catheter sheath of claim 1, wherein the super structure groove simulating acoustic artificial structure is formed by a combination of a solid aluminum ball and a polymer material.
8. An imaging device, characterized in that it comprises a catheter sheath according to any one of claims 1-7.
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| WO2023092725A1 (en) | 2023-06-01 |
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