IL287420A - Embolization microcatheter for delivery of beads to peripheral vessels - Google Patents
Embolization microcatheter for delivery of beads to peripheral vesselsInfo
- Publication number
- IL287420A IL287420A IL287420A IL28742021A IL287420A IL 287420 A IL287420 A IL 287420A IL 287420 A IL287420 A IL 287420A IL 28742021 A IL28742021 A IL 28742021A IL 287420 A IL287420 A IL 287420A
- Authority
- IL
- Israel
- Prior art keywords
- microcatheter
- embolization
- main body
- winding portion
- embolization microcatheter
- Prior art date
Links
- 230000010102 embolization Effects 0.000 title claims description 93
- 239000011324 bead Substances 0.000 title description 5
- 230000002093 peripheral effect Effects 0.000 title description 2
- 238000004804 winding Methods 0.000 claims description 52
- 210000004204 blood vessel Anatomy 0.000 claims description 28
- 230000001154 acute effect Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 206010028980 Neoplasm Diseases 0.000 description 7
- 238000013161 embolization procedure Methods 0.000 description 5
- 210000003484 anatomy Anatomy 0.000 description 3
- 230000010108 arterial embolization Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 208000005189 Embolism Diseases 0.000 description 1
- 208000032843 Hemorrhage Diseases 0.000 description 1
- 206010019695 Hepatic neoplasm Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 208000034158 bleeding Diseases 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 201000011510 cancer Diseases 0.000 description 1
- 230000003073 embolic effect Effects 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 230000002439 hemostatic effect Effects 0.000 description 1
- 208000014018 liver neoplasm Diseases 0.000 description 1
- 210000005259 peripheral blood Anatomy 0.000 description 1
- 239000011886 peripheral blood Substances 0.000 description 1
- 230000003439 radiotherapeutic effect Effects 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 210000004881 tumor cell Anatomy 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0067—Catheters; Hollow probes characterised by the distal end, e.g. tips
- A61M25/0068—Static characteristics of the catheter tip, e.g. shape, atraumatic tip, curved tip or tip structure
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/00234—Surgical instruments, devices or methods, e.g. tourniquets for minimally invasive surgery
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M25/0054—Catheters; Hollow probes characterised by structural features with regions for increasing flexibility
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M25/00—Catheters; Hollow probes
- A61M25/0043—Catheters; Hollow probes characterised by structural features
- A61M2025/0059—Catheters; Hollow probes characterised by structural features having means for preventing the catheter, sheath or lumens from collapsing due to outer forces, e.g. compressing forces, or caused by twisting or kinking
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Veterinary Medicine (AREA)
- Animal Behavior & Ethology (AREA)
- Engineering & Computer Science (AREA)
- Public Health (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- General Health & Medical Sciences (AREA)
- Pulmonology (AREA)
- Hematology (AREA)
- Anesthesiology (AREA)
- Biophysics (AREA)
- Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
Description
EMBOLIZATION MICROCATHETER FOR DELIVERY OF BEADS TO PERIPHERAL VESSELS TECHNICAL FIELD The present disclosure generally relates to the field of microcatheters for embolization, specifically to embolization catheters suitable for navigating within blood vessels for delivery of embolization beads to peripheral blood vessels.
BACKGROUND Transarterial embolization therapy, tumor embolization, or transcatheter arterial embolization (TAE), involves administration of embolization material (which may include chemotherapeutics or/and radiotherapeutics) directly to a tumor (for example, liver tumors), via a microcatheter.
Embolization of tumors is typically performed utilizing microcatheters due to the requirement for selectively affecting the tumor while preventing, as much as possible, damage to healthy tissue. A major problem associated with embolization is "non-target embolization", where the embolic material travels to blood vessels, other than those directly feeding the target tumor or tumor region, thus damaging healthy tissues, resulting in unpleasant and even hazardous outcomes.
During embolization, the embolization catheter must be advanced and navigate through small and often tortuous vessels. Accessibility to these vessels is difficult, if not precluded, using standard microcatheters. Moreover, tracking the direction of the microcatheter's progress within the blood vessels is limited due to the structure of the microcatheters.
There thus remains a need for microcatheters capable of delivering embolization beads to small and tortuous blood vessels and facilitate navigation and reliable real time tracking during the embolization procedure.
SUMMARY OF THE INVENTION The present disclosure relates to embolization microcatheters which are suitable for navigation in small and tortuous blood vessels, while also facilitating reliable real time tracking during the embolization procedure.
This is advantageously achieved by the unique structure of the embolization microcatheters, which has an elongated main body and a distal section, which includes an offsetting portion and a winding portion. The winding portion has about half a loop of a threedimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body.
Advantageously, the winding portion at the most distal of the embolization microcatheter, allows a "screw like" motion and thus facilitates advancement of the microcatheter within the blood vessel even in tortuous sections.
Moreover, the three-dimensional structure of the embolization microcatheter, particularly the off-setting of the distal winding portion, as disclosed herein in accordance with some embodiments, advantageously provides a "line-of-sight" of the microcatheter's tip as it progresses through the blood vessel. This may not be facilitated in a standard two-dimensional microcatheter, where the tip section may be hindered by the microcatheter's elongated main body and thus not seen when observing it from a proximal point of view.
Furthermore, the three-dimensional structure of the embolization microcatheter, as disclosed herein in accordance with some embodiments, may advantageously facilitate the securing the microcatheter within the blood vessel by contacting at least two points of the blood vessel wall. Such contact points contribute to the stabilization of the microcatheter in the blood vessel, which is of great importance, particularly during the delivery of embolization beads.
In operation, when the embolization microcatheters, disclosed herein in accordance with some embodiments, is inserted to blood vessel, it progresses in a "screw like" motion facilitated by the winding portion of its distal section. While the user advances the microcatheters within the often small and tortuous blood vessel, the winding portion, which is offset from the elongated main body, can be observed during the procedure. This facilitates navigation of the microcatheter within the blood vessel. During the procedure the user can also utilize the three-dimensional structure of the embolization microcatheter to contact the blood vessel wall at two or more points. This allows stabilization of the microcatheter within the blood vessel and facilitates safer and more accurate performance of the procedure.
According to some embodiments, there is provided an embolization microcatheter comprising an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion; wherein the winding portion comprises about half a loop of a threedimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body; wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body. According to some embodiments, the winding portion is configured to maneuver the microcatheter longitudinally in a screw-like motion thereby, preventing collapsing, bending kinking, backwards movement, whipping, lashing or any combination thereof of the distal section of the microcatheter. Advantageously, the screw-like motion enables controlled and/or precise steering of the distal section into specific vessels, such as small side branches, which are typically difficult to reach without numerous back and forth movements.
According to some embodiments, the off-setting portion is curved.
According to some embodiments, the longitudinal axis of the winding portion may be offset by between about 0.5 mm and about 5 mm relative to the longitudinal axis of the elongated main body.
According to some embodiments, the acute angle, at which the longitudinal axis of the winding portion is disposed relative to the longitudinal axis of the elongated main body, may be between about 10° and about 60°.
According to some embodiments, the length of the winding portion measures between about 5 mm and about 20 mm. According to some embodiments, the ratio of the length of the winding portion to a radius or mean radius, defined by the half a loop, is between about 2 and about 20.
According to some embodiments, the three-dimensional spiral is right-handed. According to some embodiments, the three-dimensional spiral is left- handed. According to some embodiments, the three-dimensional spiral is a helix.
According to some embodiments, the distal section may be pre-shaped/ pre-formed, for example, in the winding/curled/coiled structure.
According to some embodiments, the main body and the off-setting portion together may define a non-planar curve.
According to some embodiments, the elongated main body may further include a filter section including a plurality of side openings formed in a wall of the elongated main body. The side openings may be in the form of slits having a length between about 200 μm and about 800 μm and a width between about 25 μm and about 100 μm.
According to some embodiments, the embolization microcatheter may include a wall having an inner layer, an outer layer, and a skeleton intercalated between the inner layer and the outer layer. According to some embodiments, the outer layer section of the outer layer, on the distal section, may be more flexible than an outer layer section of the outer layer, on the elongated main body.
According to some embodiments, the distal section may be dimensioned such that, when inserted into a tortuous blood vessel, different portions of the distal section contact opposite sides of the tortuous blood vessel at different longitudinal positions of the tortuous blood vessel.
According to some embodiments, the embolization microcatheter may be configured for guide-wire free navigation.
According to some embodiments, the off-set portion is configured to minimize interference of a user’s field of view by the winded portion.
According to some embodiments, there is provided a method for performing an embolization procedure, the method includes: inserting to a blood vessel and advancing a embolization microcatheter and performing an embolization procedure wherein the embolization microcatheter includes an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion; wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body; and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body.
According to some embodiments, there is provided a method for producing an embolization microcatheter distal section that defines a non-planar curve, the method comprising: providing a 3-dimensional mandrel comprising an off-setting portion and a winding portion, wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body; and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body; in a heat chamber forming the embolization microcatheter tube on the mandrel, thereby producing the embolization microcatheter having the shape of the mandrel.
Certain embodiments of the present disclosure may include some, all, or none of the above characteristics. One or more technical advantages may be readily apparent to those skilled in the art from the figures, descriptions and claims included herein. Moreover, while specific characteristics have been enumerated above, various embodiments may include all, some or none of the enumerated characteristics.
In addition to the exemplary aspects and embodiments described above, further aspects and embodiments will be further expanded upon in the figures and the following detailed descriptions.
BRIEF DESCRIPTION OF THE FIGURES The features, nature and advantages of the present disclosure will become more apparent from the detailed description set forth below when taken in conjunction with the drawings in which like reference characters identify correspondingly throughout. Identical structures elements or parts that appear in more than one figure are generally labeled with the same number in all the figures in which they appear. Alternatively, elements or parts that appear in more than one figure may be labeled with different numbers in the different figures in which they appear. The dimensions of the components and features in the figures were chosen for convenience and clarity of presentation and are not necessarily shown to scale. The figures are listed below.
Figure 1 presents a schematic, perspective view of an embolization microcatheter including an elongated main body and a distal section, according to some embodiments; Figure 2A presents a schematic, side-view of the distal section of the embolization microcatheter of Figure 1 from a point-of-view directed along the negative z-axis (indicated), according to some embodiments; Figure 2B presents a schematic, side-view of the distal section of the embolization microcatheter of Figure 1 from a point-of-view directed along the positive z-axis, according to some embodiments; Figure 3A presents a schematic, side-view of the distal section of the embolization microcatheter of Figure 1 from a point-of-view directed along the negative y-axis (indicated), according to some embodiments; Figure 3B presents a schematic, side-view of the distal section of the embolization microcatheter of Figure 1 from a point-of-view directed along the positive y-axis, according to some embodiments; Figure 4A presents a schematic, front-view of the embolization microcatheter of Figure 1 , according to some embodiments; Figure 4B presents a schematic, back-view of the embolization microcatheter of Figure 1 , according to some embodiments; Figure 5A presents a schematic, side-view of the embolization microcatheter of Figure 1 from a point-of-view pointing substantially midway along a direction between the negative y-axis and the negative z-axis on the yz-plane, according to some embodiments; Figure 5B presents a schematic, side-view of the embolization microcatheter of Figure 1 from a point-of-view pointing substantially midway along a direction between the positive y-axis and the positive z-axis on the yz-plane, according to some embodiments; Figure 6A presents a schematic, cross-sectional view of the embolization microcatheter of Figure 1 from the point-of-view of Figure 5A , the cross-section bisects the main body along a plane perpendicular to the direction defined by the point-of-view, according to some embodiments; Figure 6B presents a schematic, cross-sectional view of the embolization microcatheter of Figure 1 from the point-of-view of Figure 5B , the cross-section bisects the main body along a plane perpendicular to the direction defined by the point-of-view, according to some embodiments; Figure 7 presents a histogram of the average peak tracking force of the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon"), in comparison to other embolization microcatheter; Figure 8 presents a histogram of the advancing distance through tortuous anatomy achieved by the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon"), in comparison to other embolization microcatheter; and Figure 9 presents a histogram of the tip response to torque of the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon"), in comparison to other embolization microcatheter.
DETAILED DESCRIPTION OF THE INVENTION The detailed description set forth below, in connection with the appended drawings, is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of the various concepts. However, it will also be apparent to one skilled in the art that these concepts may be practiced without specific details being presented herein. In some instances, well-known features may be omitted or simplified in order to avoid obscuring the disclosure.
One of the main challenges of embolization microcatheters is navigation in small and tortuous blood vessels, while also facilitating reliable real time tracking of the microcatheter's advancement during the embolization procedure.
Advantageously, these requirements are met by the herein disclosed microcatheter and its structural characteristics.
There is thus provided herein, in accordance with some embodiments, an embolization microcatheter including an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion, wherein the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body, and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees (for example, between about 60° and about 80°, between about 80° and about 100° or between about 100° and about 120°, each possibility presets a separate embodiment) relative to the longitudinal axis of the elongated main body. The off-setting portion may be curved.
According to some embodiments, the longitudinal axis of the winding portion may be offset by between about 0.5 mm and about 5 mm (for example, between about 0.5 mm and about mm, between about 1 mm and about 3 mm or between about 3 mm and about 5 mm, each possibility presets a separate embodiment) relative to the longitudinal axis of the elongated main body.
According to some embodiments, the acute angle, at which the longitudinal axis of the winding portion is disposed relative to the longitudinal axis of the elongated main body, is between about 10° and about 60°, for example, between about 10° and about 30°, between about 30° and about 40° or between about 40° and about 60°, each possibility presets a separate embodiment.
According to some embodiments, the length of the winding portion measures between about 5 mm and about 20 mm, for example, between about 5 mm and about 10 mm, between about mm and about 15 mm or between about 15 mm and about 20 mm, each possibility presets a separate embodiment.
According to some embodiments, the ratio of the length of the winding portion to a radius or mean radius, defined by the half a loop, is between about 2 and about 20, for example, between about 2 and about 5, between about 5 and about 10 or between about 10 and about 20, each possibility presets a separate embodiment.
According to some embodiments, the microcatheter 100may have a length of at least cm, at least 60 cm, at least 75 cm, or at least 1m. Each possibility is a separate embodiment. Each possibility is a separate embodiment.
According to some embodiments, the three-dimensional spiral may be right-handed. According to some embodiments, the three-dimensional spiral may be left-handed. According to some embodiments, the three-dimensional spiral may be a helix. According to some embodiments, the distal section may be pre-shaped.
According to some embodiments, the main body and the off-setting portion together define a non-planar curve.
According to some embodiments, the elongated main body may further include a filter section, which includes a plurality of side openings formed in a wall of the elongated main body. The side openings may be in the form of slits having a length between about 200 μm and about 800 μm and a width between about 25 μm and about 100 μm, for example, having a length between about 200 μm and about 300 μm and a width between about 75 μm and about 100 μm, or having a length between about 600 μm and about 800 μm and a width between about 25 μm and about μm or having a length between about 500 μm and about 800 μm and a width between about 50 μm and about 100 μm or having a length between about 200 μm and about 400 μm and a width between about 25 μm and about 50 μm, each possibility presets a separate embodiment.
According to some embodiments, the embolization microcatheter has a wall, which includes an inner layer, an outer layer, and a skeleton intercalated between the inner layer and the outer layer. An outer layer section of the outer layer, on the distal section, may be more flexible than an outer layer section of the outer layer, on the elongated main body.
According to some embodiments, the distal section may be dimensioned such that, when inserted into a tortuous blood vessel, different portions of the distal section contact opposite sides of the tortuous blood vessel at different longitudinal positions of the tortuous blood vessel.
As used herein, the terms "embolization", "transcatheter embolization", "transcatheter arterial embolization" and "TAE" may be used interchangeably and refer to the passage and lodging of an embolus within the bloodstream for therapeutic purposes, for example, as a hemostatic treatment of bleeding or as a treatment for some types of cancer by deliberately blocking blood vessels to starve the tumor cells.
As used herein, in accordance with some embodiments, the term "winding portion" may refer to a section of the microcatheter having a non-straight, curved, twisted, bent, spiral, coiled and/or partially coiled shape and/or having one or more loops/partial loops.
As used herein, in accordance with some embodiments, the term "off-setting portion" may refer to a section of the microcatheter connecting between the elongated main body and the winding portion of the microcatheter and shaped to create an offset and/or an (acute) angle between the longitudinal axis of the winding portion and the longitudinal axis of the elongated main body.
Reference is now made to Figure 1 , which presents a schematic, perspective view of an embolization microcatheter 100including an elongated main body 102and a distal section 104 , according to some embodiments. Distal section 104includes an off-setting portion 106and a winding portion 108 . Embolization microcatheter 100extends from a proximal end opening 112 to a distal end opening 114 .
As used herein, the terms "distal end opening" and "proximal end opening" refer to the end openings of the microcatheter leading into the lumen thereof.
Dashed line "A" represents a central longitudinal axis of embolization microcatheter 100 extending from elongated main body 102and distal section 104 , which includes off-setting portion 106and winding portion 108 .
Off-setting portion 106is disposed at an angle (for example, of between about 60° and about 120° degrees) relative to the longitudinal axis of elongated main body 102and winding portion 108forms about half a loop of a three-dimensional spiral, such that the longitudinal axis of winding portion 108is offset relative to the longitudinal axis of elongated main body 102.
Reference is now made to Figures 2A - 6B , which present various views of embolization microcatheter 100 , therefore the elements or parts numbers of Figure 1 apply to the same elements or parts of Figures 2A - 6B .
Figure 2A presents a schematic, side-view of the distal section of embolization microcatheter 100 of Figure 1 from a point-of-view directed along the negative z-axis (indicated), according to some embodiments. It is noted that off-setting portion 106(and elongated main body 102 ) continues beyond the dashed vertical line but is not shown in the figure.
Figure 2B presents a schematic, side-view of the distal section of embolization microcatheter 100 of Figure 1 from a point-of-view directed along the positive z-axis (indicated), according to some embodiments. It is noted that elongated main body 102continues beyond the dashed vertical line but is not shown in the figure.
Figure 3A presents a schematic, side-view of the distal section of embolization microcatheter 100 of Figure 1 from a point-of-view directed along the negative y-axis (indicated), according to some embodiments. It is noted that elongated main body 102continues beyond the dashed vertical line but is not shown in the figure.
Figure 3B presents a schematic, side-view of the distal section of embolization microcatheter 100 of Figure 1 from a point-of-view directed along the positive y-axis (indicated), according to some embodiments, according to some embodiments. It is noted that elongated main body 102continues beyond the dashed vertical line but is not shown in the figure.
Figure 4A presents a schematic, front-view (looking towards distal end opening 114 ) of the embolization microcatheter 100 of Figure 1 , according to some embodiments.
Figure 4B presents a schematic, back-view (looking towards proximal end opening 112 ) of the embolization microcatheter 100 of Figure 1 , according to some embodiments. It is noted that in this point of view, elongated main body 102cannot be seen as it is "hidden" behind proximal end opening 112 , while only off-setting portion 106and winding portion 108are visible.
Figure 5A presents a schematic, side-view of embolization microcatheter 100 of Figure 1 from a point-of-view pointing substantially midway along a direction between the negative y-axis and the negative z-axis on the yz-plane, according to some embodiments. It is noted that elongated main body 102continues beyond the dashed vertical line but is not shown in the figure.
Figure 5B presents a schematic, side-view of the embolization microcatheter of Figure 1 from a point-of-view pointing substantially midway along a direction between the positive y-axis and the positive z-axis on the yz-plane, according to some embodiments. It is noted that elongated main body 102continues beyond the dashed vertical line but is not shown in the figure.
Figure 6A presents a schematic, cross-sectional view of embolization microcatheter 100 of Figure 1 from the point-of-view of Figure 5A , the cross-section bisects the main body along a plane perpendicular to the direction defined by the point-of-view, according to some embodiments. It is noted that in this cross-sectional point of view, winding portion 108(or at least a portion thereof) is not visible due to its angle.
Figure 6B presents a schematic, cross-sectional view of embolization microcatheter 100 of Figure 1 from the point-of-view of Figure 5B , the cross-section bisects the main body along a plane perpendicular to the direction defined by the point-of-view, according to some embodiments. In this cross-sectional point of view, as opposed to the cross-sectional point of view of Figure 6A , winding portion 108is not visible, however, not cross- sectioned.
Reference is now made to Figures 7-11 , which present experimental results demonstrating the better performance of the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon") in comparison to other embolization microcatheters.
Figure 7 presents a histogram of the average peak tracking force of the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon"), in comparison to other embolization microcatheters (Test Protocol RD-039; n=5). The lowest trackability force [N] is obtained for the Drakon compared to other commercial embolization microcatheters, designated as commercial products 1-5. The lower trackability force is indicative of better maneuverability.
Figure 8 presents a histogram of the advancing distance through tortuous anatomy achieved by the embolization microcatheter disclosed herein according to some embodiments (designated by the name of "Drakon"), in comparison to other commercial embolization microcatheters (Test Protocol RD-055; n=5). It can be seen that the Drakon embolization microcatheter is capable of advancing in tortuous anatomy (model) farther than the other microcatheters tested.
Claims (17)
1. An embolization microcatheter comprising an elongated main body and a distal section, the distal section comprising an off-setting portion and a winding portion; wherein the winding portion is pre-shaped in a fixed three-dimensional structure, the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body; wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body, and wherein the winding portion is configured to maneuver the microcatheter longitudinally in a screw-like motion through small blood vessels and small side branches, thereby preventing collapsing and/or vibrating and/or whipping of the distal section of the microcatheter.
2. The embolization microcatheter of claim 1, wherein the off-setting portion is curved.
3. The embolization microcatheter of any one of claims 1 and 2, wherein the longitudinal axis of the winding portion is offset by between about 0.5 mm and about 5 mm relative to the longitudinal axis of the elongated main body.
4. The embolization microcatheter of any one of claims 1 to 3, wherein the acute angle, at which the longitudinal axis of the winding portion is disposed relative to the longitudinal axis of the elongated main body, is between about 10° and about 60°.
5. The embolization microcatheter of any one of claims 1 to 4, wherein a length of the winding portion measures between about 5 mm and about 20 mm.
6. The embolization microcatheter of any one of claims 1 to 5, wherein a ratio of the length of the winding portion to a radius or mean radius, defined by the half a loop, is between about 2 and about 20. 287420/
7. The embolization microcatheter of any one of claims 1 to 6, wherein the three-dimensional spiral is a helix.
8. The embolization microcatheter of any one of claims 1 to 7, wherein the distal section is pre-shaped.
9. The embolization microcatheter of any one of claims 1 to 8, wherein the main body and the off-setting portion together define a non-planar curve.
10. The embolization microcatheter of any one of claims 1 to 9, wherein the elongated main body further comprises a filter section comprising a plurality of side openings formed in a wall of the elongated main body.
11. The embolization microcatheter of claim 10, wherein the side openings are in the form of slits having a length between about 200 μm and about 800 μm and a width between about μm and about 100 μm.
12. The embolization microcatheter of any one of claims 1 to 11, comprising a wall comprising an inner layer, an outer layer, and a skeleton intercalated between the inner layer and the outer layer.
13. The embolization microcatheter of claim 12, wherein an outer layer section of the outer layer, on the distal section, is more flexible than an outer layer section of the outer layer, on the elongated main body.
14. The embolization microcatheter of any one of claims 1 to 13, wherein the distal section is dimensioned such that, when inserted into a tortuous blood vessel, different portions of the distal section contact opposite sides of the tortuous blood vessel at different longitudinal positions of the tortuous blood vessel.
15. The embolization microcatheter of any one of claims 1 to 14, configured for guide-wire free navigation.
16. The embolization microcatheter of any one of claims 1 to 15, wherein the off-set portion is configured to minimize interference of a user’s field of view by the winded portion. 287420/
17. A method for producing an embolization microcatheter distal section that defines a non-planar curve, the method comprising: providing a 3-dimensional mandrel comprising an off-setting portion and a winding portion, wherein the winding portion is pre-shaped in a fixed three-dimensional structure, the winding portion comprises about half a loop of a three-dimensional spiral, such that a longitudinal axis of the winding portion is offset and/or disposed at an acute angle relative to a longitudinal axis of the elongated main body; and wherein the off-setting portion is disposed at an angle of between about 60° and about 120° degrees relative to the longitudinal axis of the elongated main body; in a heat chamber forming the embolization microcatheter tube on the mandrel, thereby producing the embolization microcatheter having the shape of the mandrel.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL287420A IL287420B2 (en) | 2021-10-20 | 2021-10-20 | Embolization microcatheter for delivery of beads to peripheral vessels |
PCT/IL2022/051107 WO2023067601A1 (en) | 2021-10-20 | 2022-10-19 | Embolization microcatheter for delivery of beads to peripheral vessels |
EP22883113.7A EP4419182A1 (en) | 2021-10-20 | 2022-10-19 | Embolization microcatheter for delivery of beads to peripheral vessels |
KR1020247012472A KR20240088870A (en) | 2021-10-20 | 2022-10-19 | Embolization microcatheter for delivery of microspheres to peripheral blood vessels. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL287420A IL287420B2 (en) | 2021-10-20 | 2021-10-20 | Embolization microcatheter for delivery of beads to peripheral vessels |
Publications (3)
Publication Number | Publication Date |
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IL287420A true IL287420A (en) | 2023-05-01 |
IL287420B1 IL287420B1 (en) | 2023-06-01 |
IL287420B2 IL287420B2 (en) | 2023-10-01 |
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IL287420A IL287420B2 (en) | 2021-10-20 | 2021-10-20 | Embolization microcatheter for delivery of beads to peripheral vessels |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8096985B2 (en) * | 2008-05-07 | 2012-01-17 | Guided Delivery Systems Inc. | Deflectable guide |
US20130123752A1 (en) * | 2011-10-14 | 2013-05-16 | Volcano Corporation | Medical Tubing and Associated Devices, Systems, and Methods |
-
2021
- 2021-10-20 IL IL287420A patent/IL287420B2/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8096985B2 (en) * | 2008-05-07 | 2012-01-17 | Guided Delivery Systems Inc. | Deflectable guide |
US20130123752A1 (en) * | 2011-10-14 | 2013-05-16 | Volcano Corporation | Medical Tubing and Associated Devices, Systems, and Methods |
Also Published As
Publication number | Publication date |
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IL287420B2 (en) | 2023-10-01 |
IL287420B1 (en) | 2023-06-01 |
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