43 results about "Inferior vena caval" patented technology

Medical device systems and methods for making and using medical device systems are disclosed. An example medical device system includes a control system having a processor and a pump, a first expandable member coupled to the processor and configured to be positioned in the superior vena cava. The system also includes a second expandable member coupled to the processor and configured to be positioned in the inferior vena cava. The system also includes a first sensing member designed to sense a first parameter. The system also includes a second sensing member designed to sense a second parameter. Additionally, the pump is designed to expand or contract the first expandable member, the second expandable member or both the first and the second expandable members based on a change in the first parameter, the second parameter or a change in both the first and the second parameters.

The invention discloses a left atrial appendage occlusion simulation method and system based on a CT image, and the method comprises the steps: reading CT image data of a patient, segmenting a left atrium and a left atrial appendage from the CT image data, and obtaining corresponding binary three-dimensional image data; reading a left auricle opening mark point set by a user, and calculating geometric parameters of the left auricle opening in combination with the binary three-dimensional image data; reading the opening of the inferior vena cava set by the user and another arbitrary point on the inferior vena cava, calculating the optimal atrial septum puncture site and the rotation angle of the left auricle occluder conveying sheath after entering the left atrium, calculating the corresponding conveying sheath movement track curve, and outputting or visualizing the calculation result. By utilizing the embodiment of the invention, more accurate left atrial appendage parameter acquisition, surgical path planning and three-dimensional simulation of the surgical process under the three-dimensional condition can be realized, and a doctor is helped to evaluate the surgical process before the surgery.

The invention relates to anchor channels and subannular anchors for a transcatheter heart valve replacement, and in particular for an orthogonally delivered transcatheter prosthetic heart valve having a annular support frame having compressible wire cells that facilitate rolling and folding the valve length-wise, or orthogonally to the central axis of the flow control component, allowing a very large diameter valve to be delivered and deployed to the tricuspid valve from the inferior vena cava or superior vena cava, or trans-atrially to the mitral valve, the valve having a height of about 5-60 mm and a diameter of about 25-80 mm, without requiring an oversized diameter catheter and without requiring delivery and deployment from a catheter at an acute angle of approach.

A method of determining measurements of the Inferior Vena Cava, IVC, using ultrasound imaging, comprising providing a three-dimensional, 3D, ultrasound image of a portion of the body in which the IVC is located, performing image analysis on the 3D ultrasound image to identify the IVC relative to other anatomical structures, selecting a single slice of the three-dimensional image, the slice comprising a cross-sectional image of the IVC, and determining the cross-sectional area of the IVC from the cross-sectional image of the IVC in the selected slice.

The utility model provides a teaching model for simulating patent foramen ovale, which comprises an atrium module, a partition module, a base, a magnet sheet and a metal sheet, and is characterized in that the atrium module is arranged on the base and comprises a left atrium and a right atrium, and the upper part of the left atrium is connected with pulmonary veins; the upper part of the right atrium is connected with superior vena cava, and the lower part of the right atrium is connected with inferior vena cava; the partition module is used for separating the left atrium and the right atrium; the septum module comprises a secondary septum connected with the right atrium and a primary septum connected with the left atrium, the rear side of the primary septum is connected with the rear side of the secondary septum, a first groove is formed in the outer surface of the front side of the secondary septum, the magnet sheet is arranged in the first groove, a second groove is formed in the outer surface of the front side of the primary septum, and the metal sheet is arranged in the second groove. The magnet sheet and the metal sheet attract each other; and an oval hole for communicating the left atrium with the right atrium is formed between the primary septum and the secondary septum. The patent foramen ovale teaching aid enables teaching of patent foramen ovale diseases to be more convenient.

The invention relates to anchor channels and subannular anchors for a transcatheter heart valve replacement, and in particular for an orthogonally delivered transcatheter prosthetic heart valve having a annular support frame having compressible wire cells that facilitate rolling and folding the valve length-wise, or orthogonally to the central axis of the flow control component, allowing a very large diameter valve to be delivered and deployed to the tricuspid valve from the inferior vena cava or superior vena cava, or trans-atrially to the mitral valve, the valve having a height of about 5-60 mm and a diameter of about 25-80 mm, without requiring an oversized diameter catheter and without requiring delivery and deployment from a catheter at an acute angle of approach.

The utility model discloses a multifunctional bedside nasojejunum nutrition tube placement training device which comprises a head and neck bionic block, a nasopharyngeal cavity channel is arranged in the head and neck bionic block; the pleuroperitoneal cavity frame comprises a hard simulation frame and bionic skin covering the hard simulation frame. Wherein the head and neck bionic block and the pleuroperitoneal cavity frame are integrally formed or detachably connected. A bionic esophagus, a bionic stomach, a bionic duodenum and a part of bionic jejunum which are sequentially connected are arranged in the pleuroperitoneal cavity frame, and a bionic cardia and a bionic pylorus are arranged at the head end and the tail end of the bionic stomach respectively. A bionic inferior vena cava, a bionic abdominal aorta, a bionic mesenteric superior vein and a bionic mesenteric superior artery are further arranged in the pleuroperitoneal cavity frame; the bionic inferior vena cava and the bionic abdominal aorta are arranged on the rear sides of the bionic stomach and the bionic duodenum, the bottom ends are closed, and the head ends penetrate out of the bionic skin; the bottom ends of the bionic superior mesenteric vein and the bionic superior mesenteric artery are closed, and the head ends of the bionic superior mesenteric vein and the bionic superior mesenteric artery partially wrap the bionic duodenum and then penetrate out of the bionic skin.

Systems and methods are disclosed that provide for regular, periodic or continuous monitoring of fluid volume based on direct measurement of an inferior vena cava (IVC) physical dimension using a wireless measurement sensor implanted in the IVC. By basing diagnostic decisions and treatments on changes in an IVC physical dimension, information on patient fluid state is available across the entire euvolemic range of fluid states, thus providing earlier warning of hypervolemia or hypovolemia and enabling the modulation of patient treatments to permit more stable long-term fluid management.

The utility model relates to the technical field of organ models, and specifically is a detachable renal segment model, comprising a base, wherein an inferior vena cava model and an abdominal aorta model are fixedly connected to the base, and a blood vessel model is fixedly connected to the inferior vena cava model and the abdominal aorta model, and a right kidney module and a left kidney module are arranged on the blood vessel model, wherein the right kidney module comprises a right anterior kidney, a right posterior kidney and a right ureter, and the left kidney module comprises a left anterior kidney, a left posterior kidney and a left ureter. In the utility model, the right posterior kidney mainly displays the outer edge and renal cortex of the kidney, and is used to help students recognize the outer edge and renal cortex of the kidney, and LED lamps and lamp strips at different positions have different lamp colors, so the left posterior kidney can use different lamp colors at different positions to help students recognize the renal medulla, renal pyramids, renal calyces, renal calyces, renal pelvis, renal hilum, renal columns, renal papillae and other parts of the kidney, and is also used to help students recognize the internal blood vessel arrangement relationship of the kidney.

The present application relates to the technical field of image analysis, and in particular to a kind of inferior vena cava filter implantation puncture target point auxiliary path planning method.Multiple CT images of the inferior vena cava of the patient are obtained, and the region to be distinguished is preliminarily divided based on the shape change of the blood vessel.Then, combined with the shape features and area change of the region to be distinguished, the blood vessel overlap representation evaluation index is determined, and the overlap and non-overlap regions are distinguished.Next, the overlap and non-overlap regions are combined, the shape similarity and overlap representation evaluation index similarity are analyzed, the smooth continuation index is determined, and the matching combination is screened out based on the index and the proportion of blood vessel overlap area.In addition, the gray value difference of blood vessels at different levels in the CT image is also considered, and the non-blood vessel overlap region is evaluated at different levels to more accurately represent the region belonging to the same blood vessel.Finally, according to the hierarchical evaluation result, the navigation path planning of the puncture target point in the region with blood vessel overlap is more accurate, and the planning accuracy is improved.

The present invention relates to the field of surgical forceps, and specifically to an inferior vena cava root vascular dissection and separation forceps for liver surgery. The present invention comprises a forceps body and a tubular body, wherein a pull rod is provided within the tubular body; a first support seat is fixedly connected to the inner wall of the tubular body, a transmission gear disc is rotatably connected to the first support seat, a hollow telescopic rod is fixedly connected to the middle of the transmission gear disc, the other end of the telescopic rod is connected to the forceps body, and the pull rod is used to pass through the telescopic rod and drive the forceps body to clamp by pulling; a second support seat is fixedly connected to the inner wall of the tubular body, the middle section of the pull rod is a serrated flexible strip structure, and the second support seat is provided with a lock hole and a first lock tooth for one-way engagement with the serrated flexible strip structure; a ratchet bar is slidably connected to the inner wall of the tubular body, the pull rod is provided with a second lock tooth for one-way engagement with the ratchet bar, and a driving member is provided on the end of the ratchet bar near the transmission gear disc. The technical solution of the present invention can control the clamping of the forceps body by pulling out the pull rod, and control the rotation of the forceps body by withdrawing the pull rod, thereby optimizing hand operation and improving control performance.

The invention relates to the technical field of medical image processing, and discloses an ultrasonic measurement method and device for an inferior vena cava, electronic equipment and a storage medium, and the method comprises the steps: obtaining the ultrasonic image data of the inferior vena cava at the current moment; based on the characteristics of the inferior vena cava in the ultrasonic image data, positioning the area where the inferior vena cava is located by adopting a voting algorithm; on the basis of the area where the inferior vena cava is located, the simplified active contour model is combined, and pipe wall information of the inferior vena cava is extracted; and calculating parameters of the inferior vena cava in a respiratory cycle based on the tube wall information of the inferior vena cava. According to the method, the number of parameters of the active contour model and the calculation complexity are reduced, the extraction speed of the inferior vena cava wall information is increased, and the inferior vena cava wall information can be conveniently obtained in real time. In addition, according to the inferior vena cava wall information obtained in real time, the parameters of the inferior vena cava in one respiratory cycle can be calculated in real time, the accuracy of calculation of the parameters of the inferior vena cava is effectively improved, and the real-time requirement of inferior vena cava measurement can be met.

The present application discloses an organ chamber, an organ transporter, and an organ transportation method. The organ chamber of the present application comprises a housing, a bearing member, a mounting member, and a support member; an accommodating cavity is defined in the housing; the bearing member is provided in the accommodating cavity, and a clearance hole is formed in the bearing member; the mounting member is provided in the accommodating cavity, and is used for arrangement of lifting portions; the lifting portions are configured to be connected to ligaments of an organ and the mounting member, so as to suspend the organ in the accommodating cavity; the support member passes through the clearance hole and protrudes out of the bearing member; and the support member is configured to be capable of passing through the inferior vena cava of the organ to restrict the oscillation of the organ. The organ chamber is used for accommodating an organ, and can simulate the posture of an organ in a human body to avoid compression of the bottom area of the organ due to its own weight, thereby reducing the probability of local ischemia of the organ.

The invention discloses a capturing device of an inferior vena cava filter and a using method, and relates to the technical field of medical instruments. According to the capturing device of the inferior vena cava filter and the using method, the capturing device comprises a leading-in device, a snare catheter is movably installed in the leading-in device, a snare is movably installed in the snare catheter, a traction hook is movably installed in the leading-in device, and torque devices are installed on the surface of one end of the snare catheter and the surface of one end of the traction hook. According to the inferior vena cava filter, the traction hook provided with the inverted-U-shaped hook is additionally arranged, so that the operation space and angle are not limited, the inferior vena cava filter can be taken out only through one puncture point without assistance of other instruments, and the inferior vena cava filter is easy and convenient to operate, minimally invasive and safe; the operation time is obviously shortened, and the radiation dose of doctors and patients is reduced.

The invention provides a vena cava retrograde perfusion simulation training device, and belongs to the field of medical engineering. The simulation training device provided by the invention is provided with the simulation person containing the heart position container, can reproduce the operation situation of vena cava retrograde perfusion in real extracorporeal circulation, and provides real-time feedback. The simulation training device simultaneously comprises a main pump, an inferior vena cava retrograde perfusion pump A, a superior vena cava retrograde perfusion pump B, and a first pressure sensor, a second pressure sensor and a third pressure sensor which are used for measuring the pressure of the inferior vena cava retrograde perfusion pump A and the superior vena cava retrograde perfusion pump B. The vena cava retrograde perfusion simulation training device can simulate a human body circulation system, and can perform simulation training of similar clinical brain retrograde perfusion combined with inferior vena cava retrograde perfusion technology, superior vena cava retrograde perfusion technology and brain priority whole body retrograde perfusion technology on employees.

The invention provides a tricuspid valve clip operation simulator which comprises a bottom plate, and a first side of the bottom plate is provided with a first storage groove and a second storage groove; the first module is provided with a tricuspid valve simulation part, and the first module is arranged on the bottom plate in a mode that the first module can be switched between an unfolded state and a folded state; the second module is provided with a lower cavity tube used for simulating the inferior vena cava, and the second module is arranged on the bottom plate in the mode that the second module can be switched between the unfolded state and the folded state; when the first module is in an unfolded state, the tricuspid valve simulation part protrudes out of the bottom plate, and the tricuspid valve simulation part and the bottom plate form an analogue simulation position; when the second module is in an unfolded state, the lower cavity tube protrudes out of the bottom plate to form a surgical instrument access path; when the first module is in the folded state, the first module is integrally contained in the first containing groove, and when the second module is in the folded state, the second module is integrally contained in the second containing groove.

The invention provides a vena cava filter conveying system and a control method thereof. The vena cava filter conveying system comprises a conveying sheath tube, a sealing assembly, a pushing assembly and a filter. The sealing assembly is arranged at the near end of the conveying sheath tube, the filter is contained in an inner cavity of the conveying sheath tube, and the pushing assembly continuously extends to the inner cavity of the sealing assembly and the inner cavity of the conveying sheath tube and drives the filter to move relative to the conveying sheath tube. The far end of the pushing assembly is provided with a limiting piece. The filter is provided with a plurality of groups of supporting structures which are distributed at equal intervals along the circumferential direction and have gradually increased lengths along the first direction; the supporting structure is propped between the conveying sheath tube and the radial direction of the limiting piece in a folded state, and the supporting structure in the folded state moves in the inner cavity of the conveying sheath tube in the first direction or the second direction opposite to the first direction through the pushing effect of the limiting piece. Through the application, the filter is accurately released at a proper position of the inferior vena cava, and the risk of thrombus shedding or filter displacement is reduced.

The invention discloses a lower vena cava cancer embolus extraction instrument under an endoscope, and belongs to the technical field of medical instruments. Comprising a digging spoon rod part and a digging spoon body part, the digging spoon body part is installed at one end of the digging spoon rod part through a connecting block, the digging spoon body part comprises an elastic ring and a flexible film, the connecting block is fixedly installed on one side of the elastic ring, the flexible film is round, the edge of the flexible film is fixedly connected with the elastic ring, an inserting hole is formed in the connecting block, and the inserting hole is communicated with the elastic ring. The elastic ring is provided with an insertion hole, the insertion hole is formed in the radial direction of the elastic ring, a necking mechanism is arranged in the digging spoon rod part, and the necking mechanism can move out of the insertion hole to push the elastic ring, so that the elastic ring deforms. By arranging the necking mechanism, the digging spoon body part can be switched between the contraction state and the expansion state, and when the cancer embolus in the inferior vena cava is thick and the digging spoon in the expansion state is difficult to enter, the round digging spoon body part is adjusted to be in the oval contraction state, so that the digging spoon body part can conveniently extend into the inferior vena cava from the inferior vena cava opening, and the cancer embolus can be conveniently taken out.

The invention discloses an inferior vena cava measurement method, device and equipment and a storage medium, and relates to the field of inferior vena cava measurement, and the method comprises the steps: carrying out the key point positioning and semantic segmentation of an inferior vena cava ultrasonic image, so as to obtain a key point at the joint of the inferior vena cava and the right atrium, and a mask region corresponding to the inferior vena cava; determining a corresponding inferior vena cava direction by using the mask region, and drawing a target vertical line section perpendicular to the inferior vena cava direction on a measurement position determined based on the key point; and measuring a line segment passing through the mask area on the target vertical line segment to determine the inner diameter of the inferior vena cava. According to the method, the target vertical line section perpendicular to the front wall and the rear wall of the inferior vena cava can be automatically determined in the inferior vena cava ultrasonic image in a key point positioning and semantic segmentation mode, so that automatic measurement of the inner diameter of the inferior vena cava is achieved, and the accuracy of measurement of the inner diameter of the inferior vena cava is improved.

The present invention discloses an instrument for removing cancer thrombus from the inferior vena cava under laparoscopy, belonging to the technical field of medical instruments. The instrument comprises a scoop rod and a scoop body, wherein the scoop body is installed at one end of the scoop rod through a connecting block, wherein the scoop body comprises an elastic ring and a flexible membrane, wherein the connecting block is fixedly installed on one side of the elastic ring, wherein the flexible membrane is circular, and the edge of the flexible membrane is fixedly connected to the elastic ring, wherein a plug hole is provided on the connecting block, wherein the plug hole is arranged along the radial direction of the elastic ring, and wherein a shrinking mechanism is arranged inside the scoop rod, wherein the shrinking mechanism can be moved out of the plug hole to push the elastic ring, thereby deforming the elastic ring. The present invention can switch between the contraction state and the expansion state of the scoop body by arranging a shrinking mechanism, and when the cancer thrombus in the inferior vena cava is thick and the scoop in the expanded state is difficult to enter, the circular scoop body is adjusted to an elliptical contraction state, so that the scoop body can be extended from the opening of the inferior vena cava into the inferior vena cava, thereby facilitating the operation of removing the cancer thrombus.

Apparatus and methods are described including reducing cardiac preload of a subject by partially occluding a vena cava of the subject at an infra-renal location. One or more physiological parameters of the subject are monitored, the one or more physiological parameters including lower body venous pressure, central venous pressure, central venous blood flow, renal venous pressure, cardiac diameter, cardiac volume, arterial pressure, and / or arterial blood flow. An extent to which the vena cava is occluded at the infra-renal location is modulated, responsively to the one or more physiological parameters. Other applications are also described.

The invention relates to the technical field of image analysis, in particular to an auxiliary path planning method for implanting an inferior vena cava filter into a puncture target. A plurality of CT images of the inferior vena cava of a patient are obtained, and a to-be-distinguished area is preliminarily divided based on vascular morphological changes. And then, in combination with shape features and area change conditions of the to-be-distinguished region, determining a blood vessel overlapping characterization evaluation index, and distinguishing an overlapping region and a non-overlapping region. Thirdly, combining the overlapping area and the non-overlapping area, analyzing shape similarity and overlapping representation evaluation index similarity, determining a smooth continuation index, and screening out a matching combination based on the index and a blood vessel overlapping area proportion; besides, gray value differences of different levels of blood vessels in the CT image are also considered, and level evaluation is performed on a non-blood vessel overlapping region, so that the region belonging to the same blood vessel is represented more accurately. And finally, more accurate puncture target navigation path planning is carried out on the region with blood vessel overlapping according to a hierarchical evaluation result, so that the planning precision is improved.

The present disclosure provides a transcatheter occluder device (1) for high venosum atrial septal defects (hv-asds). The device (1) comprises at least one connecting wire (2), a left occluder disk (3), and an asymmetrically designed right occluder disk (4). A first occluder form (A) includes a rear fixation lobe (5), an upper fixation lobe (6), and a lower fixation lobe (7), with the connecting wire (2) connected to the left occluder disk (3) and formed to provide a crown shape. A second occluder form (B) includes a first ring stabilizer (8) as a spiral ring and a second stabilizer (9) at the end of the connecting wire (2) for insertion into the superior vena cava and the inferior vena cava. The connecting wire (2) comprises a mesh wire. The device's (1) asymmetrical design allows secure anchoring to the inferior vena cava rim, addressing the unique challenges of high venosum atrial septal defects.

The present application relates to the technical field of data processing, in particular to a pediatric transcarotid arterial and venous ECMO cannulation depth prediction method and system, comprising: selecting a data object; incision position positioning; according to the corresponding incision position, measuring the depth of the common carotid artery to the innominate artery into the aortic arch at the corresponding incision position as the ECMO arterial cannulation depth; according to the corresponding incision position, measuring the depth of the internal jugular vein to the inferior vena cava into the right atrium at the corresponding incision position as the ECMO venous cannulation depth; establishing a prediction formula; outputting the prediction result for reference; the present application summarizes the existing pediatric transcarotid arterial and venous ECMO cannulation experience, calculates and verifies the prediction formula of the transcarotid arterial and venous ECMO cannulation depth, so as to provide a reference to help doctors more accurately estimate the cannulation depth before cannulation, reduce complications caused by improper cannulation position; the prediction formula can be used as part of the standardized operation, improve the success rate and safety of ECMO cannulation.

The utility model discloses an inferior vena cava drainage tube for cardiac surgery extracorporeal circulation operation, which belongs to the technical field of medical instruments and comprises a drainage tube body, a plurality of external connection blocks are fixedly connected to the rear end of the outer wall of the drainage tube body at equal intervals, and guide grooves are formed in the inner walls of the external connection blocks. The left end and the right end of the inner wall of the guide groove are slidably connected with limiting blocks, the left end and the right end of the outer wall of each limiting block are fixedly connected with magnetic plates, and a flow guide mechanism is arranged in the middle of the inner wall of the drainage tube body and comprises a one-way valve installed in the middle of the inner wall of the drainage tube body. The inner wall of each external connection block is designed to be one sixth of that of a pipe body, the limiting blocks are rotated after the drainage pipe is clamped into a connector of the extracorporeal circulation machine, the limiting blocks in the two different external connection blocks can be attracted through the magnetic plates on the outer walls of the limiting blocks, and therefore a closed loop is formed, and the connection stability of the external connection blocks is guaranteed.

The disclosure notably relates to an apparatus for minimally invasive medical use, comprising an elongated part including a catheter and / or a catheter sheath, the elongated part having a distal portion and an intermediate portion, the elongated part being configured for being introduced inside the inferior vena cava of a human patient and positioned at an operating location where the distal portion is in and / or beyond the right atrium and the intermediate portion is in the inferior vena cava, and one or more monitoring electrodes arranged on the intermediate portion of the elongated part, the one or more monitoring electrodes being configured for monitoring an electrical activity of the diaphragm of the human patient when the elongated part is positioned at the operating location. This forms an improved solution for monitoring an electrical activity of the diaphragm of a human patient.

The atrial septum puncture system comprises a puncture sheath tube, the puncture sheath tube comprises a first bent section and a second bent section which are located between the near end and the far end, the first bent section and the second bent section are formed by pre-molding the puncture sheath tube, the first bent section is constructed to be bent in the direction away from the atrial septum, and the second bent section is constructed to be bent in the direction away from the far end of the atrial septum. The second bent section is constructed to be bent in the direction of the atrial septum so that the far end of the puncture sheath tube can point to the atrial septum. The pre-molded first bent section and the pre-molded second bent section enable the structure of the puncture sheath tube to be matched and conform to the path from the inferior vena cava to the atrial septum fossa ovalis, during surgical operation, after an operator pushes the far end of the puncture sheath tube to the right atrium under the guidance of a medical image, the puncture sheath tube can be pushed or rotated in the axial direction, and the puncture operation can be completed. Therefore, the far end of the puncture sheath tube can point to the position of the atrial septum fossa ovale, the bending adjusting step of the puncture sheath tube is reduced, the dependence of an operator on ultrasound is reduced, and the operation is more simplified and convenient.

Systems and methods are disclosed that provide for regular, periodic or continuous monitoring of fluid volume based on direct measurement of an inferior vena cava (IVC) physical dimension using a wireless measurement sensor implanted in the IVC. By basing diagnostic decisions and treatments on changes in an IVC physical dimension, information on patient fluid state is available across the entire euvolemic range of fluid states, thus providing earlier warning of hypervolemia or hypovolemia and enabling the modulation of patient treatments to permit more stable long-term fluid management.

This invention discloses a segmented removal device for cardiac pacing electrodes via the inferior vena cava route. It includes an operating handle and a main tube connected to one end of the operating handle, a control component axially slidable inside the main tube and extending to its distal end; a grabbing and cutting assembly installed at the distal end of the main tube, controlled by the control component and a pull rod within the main tube to clamp and cut the cardiac pacing electrode lead; and a lead-grabbing bracket fitted on the outside of the main tube, movable distally and detached from the main tube under external force. The lead-grabbing bracket is an elastic structure with a coiled state and an open state; when fitted on the outside of the main tube, it is in a coiled state, and after detachment, it automatically opens, allowing other objects to pass through. This invention solves the problem that existing pacing electrode removal tools may increase the risk of vascular tearing and myocardial perforation when pulling on cardiac pacing electrodes.

The present application discloses a device that can provide a fluid connection between fluid vessels (such as between the inferior vena cava and the abdominal aorta). The device may include a conduit structure for deployment in a first fluid vessel or a shunt structure for deployment in a passage between the first fluid vessel and a second fluid vessel adjacent to the first fluid vessel. The conduit structure may include a stenotic section, and the shunt structure is fixed to the stenotic section and is fluidically connected thereto.