72 results about "Abdominal aorta" patented technology

The balloon catheter blood pump comprises a pump body, a flow guide cone, a tail sleeve, a five-cavity catheter, a balloon and an impeller rotor assembly, the pump body comprises an inflow cage, a middle section and an outflow cage, the outflow cage end of the pump body is connected with the flow guide cone, the flow guide cone is connected with the tail sleeve, the tail sleeve is connected with the five-cavity catheter, and the five-cavity catheter is connected with the impeller rotor assembly. The two ends of the balloon are fixed to the middle section of the pump body in a sleeved mode, five round holes are formed in the cross section of the five-cavity catheter and include two flushing fluid perfusion holes, a wiring hole, a balloon injection hole and a center hole, the impeller rotor assembly comprises an impeller, an impeller shaft, a bearing and a flexible transmission shaft, and the impeller is installed at the far end of the impeller shaft and arranged in the pump body. A bearing is arranged between the impeller shaft and the inner wall of the flow guide cone, the near end of the impeller shaft is connected with the far end of a flexible transmission shaft, the flexible transmission shaft penetrates through the center hole, a gap a is reserved between the impeller shaft and the flow guide cone in the radial direction, and a gap b communicated with the gap a is reserved between the impeller and the flow guide cone in the axial direction.

Some embodiments of a rotational atherectomy device can remove (partially or completely) stenotic lesions in blood vessels by rotating one or more abrasive elements in an orbital path to abrade and breakdown the lesion. In particular implementations, multiple abrasive elements are arranged along a distal portion of a drive shaft with an improved configuration so as to facilitate both efficient navigation into vessels extending from the abdominal aorta such as the common iliac artery, the external iliac artery, the internal iliac artery, the profunda artery, the gluteal artery, and the pudental artery and effective orbital paths for abrading stenotic material in such vessels and junctions between such vessels.

The present invention discloses a vascular clamp applicable to abdominal aorta occlusion and catheterization, which comprises two articulated clamp arms. Each clamp arm is provided with a clamp head, and each clamp head is provided with two spaced-apart clamping parts. Two clamping parts on one clamp head can be correspondingly clamped with two clamping parts on the other clamp head to form two sets of clamping members. One of the two clamping parts forming a clamping member in one set is provided with an elastic member and an adjusting member. The elastic member is arranged on the side of the clamping part close to the other clamping part forming the clamping member, and the adjusting member is connected to the elastic member and can adjust the clamping distance between the elastic member and the clamping part when the other set of clamping members maintains a clamping state. The present invention can open and block both ends of the abdominal aorta during the operation through two sets of clamping members, so as to effectively block and control the blood flow of the abdominal aorta during the operation of obtaining abdominal organs, greatly simplify the operation of establishing the abdominal aorta perfusion system, reduce the ischemic time of organs, and improve the quality of donor organs.

The retractor for thoracoabdominal aorta replacement comprises a clamping assembly connected with an operating bed, the upper half portion of the clamping assembly is connected with a first connecting rod through a first locking assembly, the other end of the connecting rod is connected with two symmetrically-arranged universal balls through a second locking assembly, the universal balls are connected with a second connecting rod, and the second connecting rod is connected with a second connecting rod. A plurality of first traction assemblies and a plurality of second traction assemblies are installed on the second connecting rod through third locking assemblies. The device can be installed at any position of an operating bed, the second connecting rod can rotate by 360 degrees through the universal ball, the device adapts to patients with different fatnesses, the mounting angle and the mounting position can be adjusted through various locking assemblies, the device further adapts to patients with different body types, the whole structure can be detached into single structures to be disinfected and maintained, and the device is very convenient to use.

The invention relates to the technical field of medical instruments, and discloses a disposable simple in-vitro transplantation renal artery perfusion apparatus which comprises a buckle seat, a panel and a perfusion tube, a perfusion tube mounting hole is formed in the middle of the panel, the perfusion tube is connected in the perfusion tube mounting hole in the middle of the panel in a penetrating mode, one end of the perfusion tube is connected with a perfusion tube, and the other end of the perfusion tube is connected with a drainage tube. The other end is inserted into the abdominal aorta; the buckle base comprises a bottom plate and side plates arranged at the two ends of the two sides of the bottom plate, a penetrating hole is formed in the middle of the bottom plate, and clamping grooves are formed in the inner sides of the side plates. The disposable simple in-vitro transplantation renal artery perfusion apparatus can be effectively fixed at an opening of an artery, perfusion can be carried out by connecting an infusion tube, assistance of other people is not needed, fixation is good, perfusate cannot leak out to cause waste, and intima of the artery cannot be damaged to cause series complications.

Some embodiments of a rotational atherectomy device can remove (partially or completely) stenotic lesions in blood vessels by rotating one or more abrasive elements in an orbital path to abrade and breakdown the lesion. In particular implementations, multiple abrasive elements are arranged along a distal portion of a drive shaft with an improved configuration so as to facilitate both efficient navigation into vessels extending from the abdominal aorta such as the common iliac artery, the external iliac artery, the internal iliac artery, the profunda artery, the gluteal artery, and the pudental artery and effective orbital paths for abrading stenotic material in such vessels and junctions between such vessels.

The invention relates to the technical field of medical instruments, in particular to an abdominal aorta graft recovery device which comprises a circular-tube-shaped supporting catheter, a sliding base is movably installed in the supporting catheter in the axial direction, a plurality of extension rods are fixedly installed on one side of the sliding base, and the extension rods are evenly arranged around the axis of the supporting catheter at intervals. The ends, far away from the sliding seat, of all the extension rods are jointly and fixedly mounted on an annular net-shaped structure used for wrapping the aortic graft, and the annular net-shaped structure can elastically stretch out and draw back in the circumferential direction; the barbs on the infected stent are gradually separated from the blood vessel through rotation of the metal wire, after the metal wire wraps the infected stent, the push rod is pulled back, the metal wire wraps the infected stent, cohesion is achieved, the metal wire is collected into the supporting catheter, and recovery of the infected stent is achieved.

The present invention relates to a self-expanding stent (1) for implantation in the abdominal aorta of a human body for the treatment of abdominal aortic aneurysm, the stent (1) comprising an expandable framework (2) formed from a shape memory alloy and having a distal end (4), a proximal end (6), and an interior volume extending along a central axis from the distal end (4) to the proximal end (6), the framework (2) having at least a distal end ring (8) and a proximal end ring (10) with peaks (12) and valleys (13), and optionally at least one ring (14, 15) disposed between the distal end ring (8) and the proximal end ring (10), the framework (2) having a length LF from the distal end (4) to the proximal end (6) of at least 10 mm, the stent having a compressed state having a minimum diameter (Dmin), an expanded state having a nominal diameter (DN), and a relaxed state having a maximum diameter (Dmax). According to the present invention, at least one of the distal ring (8), the proximal ring (10), and the optional rings (14, 15) of the stent (1) exhibits a nominal radial resistance pressure (RRP-N) of 100 mmHg or greater at a nominal diameter (DN). The present invention also relates to a method.

Described herein are pumps that linearly reciprocate to assist with circulating blood within the body of a patient. Red blood cell damage may be avoided or minimized by such linear pump movement. The linearly reciprocating movement may also generate a pulsatile pumping cycle that mimics the natural pumping cycle of the heart. The pumps may be configured to reside at various body locations. For example, the pumps may be situated within the right ventricle, the left ventricle, the ascending aorta, the descending aorta, the thoracic aorta, or the abdominal aorta. In some instances, the pump may be deployed within the venous circulation. In other instances, the pump may reside outside the patient.

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.

The utility model provides an aorta abdominalis graft infection stent extraction device, which comprises a main body, a stent recovery clamp and an operating handle, an accommodating cavity is arranged in the main body, the accommodating cavity is exposed at the front end of the main body, the surface of the main body is smooth, the operating handle is positioned at the rear end of the main body, and the stent recovery clamp is arranged in the accommodating cavity. The operation handle pushes and pulls the support recovery clamp. The main body comprises an outer layer, an inner layer and a barb recovery part, the inner layer is arranged in the outer layer, and the front end of the inner layer is located on the rear side of the front end of the outer layer; the barb recovery part is located between the inner layer and the outer layer, and the barb recovery part is connected with the front end of the inner layer, so that the safety of taking out the stent graft is guaranteed, and damage to the aorta wall is avoided.

The application discloses an ultrasonic imaging system for accurately collecting heart sections in any body position, which comprises a plurality of two-dimensional ultrasonic arrays randomly distributed in space, a multichannel ultrasonic signal collecting module and a three-dimensional ultrasonic imaging module; the plurality of two-dimensional ultrasonic arrays, the multichannel ultrasonic signal collecting module and the three-dimensional ultrasonic imaging module are sequentially connected; wherein the plurality of two-dimensional ultrasonic arrays comprises a plurality of ultrasonic transducer arrays forming sub-area line scanning or sub-area surface scanning or cross surface scanning; the application provides doctors with more detailed images, which is helpful for more accurately positioning and evaluating lesions; can solve the problems of difficulty in collecting correct imaging sections, imaging section changes in motion and the like in wearable ultrasonic heart imaging; is not only suitable for the heart, but also suitable for the brain, the liver, the kidney, the urinary bladder, the abdominal aorta, the inferior vena cava and the like human tissues and parts.

The invention belongs to the technical field of in-vitro organ perfusion, and provides a sequential liver perfusion machine integrating acquisition, storage and transplantation. The device comprises an organ containing module which is provided with an organ containing basin; the in-vitro organ perfusion module is used for establishing perfusate circulation for the in-vitro organs placed in the organ accommodating basin; the in-vitro lung simulation module is used for inputting gas components into perfusate; the temperature adjusting module is used for adjusting the temperature of the perfusate; a perfusate exchange module; and the NRP module is used for injecting blood into the abdominal aorta of the donor and collecting blood flowing out of the inferior vena cava. Compared with the prior art, a clinical transplantation scheme is improved; a UW-MP, oxygen-containing carrier colloidal fluid and blood continuous exchange scheme is provided, and the organ quality is effectively improved; the convenience of preparation and use of the machine is improved, and the cost of consumables is reduced; the blood vessel tension change can be continuously and quickly coped with; in conclusion, the safety and stability of the perfusion system are obviously improved, and the mental pressure of medical staff is reduced.

An apparatus configured to apply pressure to the abdominal aorta of a patient comprising: a plunger having a first end for contacting a patient and applying pressure to the abdominal aorta of the patient; a counter pressure part configured to contact a support surface; and an intermediate member having a first end and an opposite second end wherein the intermediate member is coupled to: the plunger at the first end of the intermediate member; and the counter pressure part at the second end of the intermediate member; and wherein the plunger is movable towards and away from a patient and wherein the apparatus is configured such that the position of the plunger is fixable such that applied pressure is maintained, the apparatus further comprising a pressure indicator configured to provide an indication that a target pressure has been applied by the plunger.

The invention provides an ultrasound imaging enhanced balloon, a preparation method thereof and an ultrasound imaging enhanced abdominal aorta blocking device. The ultrasonic imaging enhanced balloon comprises a balloon body and an ultrasonic imaging enhanced coating, and the outer surface of the balloon body is coated with the ultrasonic imaging enhanced coating; wherein the ultrasonic imaging enhanced coating comprises ultrasonic imaging enhanced particles, a silica gel polymer and a curing agent; the ultrasonic imaging enhanced particles comprise at least one of metal nanoparticles, metal oxide nanoparticles, gas encapsulated microbubbles or liquid encapsulated microbubbles, and the average particle size of the ultrasonic imaging enhanced particles is 40-150 nm. According to the balloon, real-time and clear positioning and state recognition can be achieved, the intraoperative balloon positioning precision is remarkably improved, dependence on the experience of an operator is reduced, and the occurrence rate of complications such as puncture injury and intraoperative bleeding caused by inaccurate positioning is also effectively reduced.

The invention provides a preparation method of a soft tissue filling agent with a vascularization promoting function, and relates to the field of medical biological materials, and the preparation method comprises the following steps: taking aorta abdominalis blood vessels, carrying out alkali treatment, rinsing, decellularizing, disinfecting, carrying out secondary rinsing, shearing, grinding, sieving, and compounding with cross-linked sodium hyaluronate gel to obtain soft tissue filling gel. The soft tissue filling agent prepared by the method contains rich elastin and factors for promoting vascularization, and can improve the defects of the existing materials in tissue filling and repairing.

The present disclosure provides a training method, a blood vessel recognition method, a device, an electronic device, a storage medium, and a computer program product for a blood vessel recognition model, including: inputting each image group into a corresponding MSFUnet network; inputting a plurality of first blood vessel recognition results corresponding to a plurality of MSFUnet networks into an LSTM network; calculating a first loss based on the first blood vessel recognition result output by each MSFUnet network and a first image label; calculating a second loss based on the final blood vessel recognition result output by the LSTM network and a second image label; adjusting the parameters of the MSFUnet network based on the first loss and adjusting the parameters of the LSTM network based on the second loss. By using the multi-frame fusion algorithm L-MSFUnet, that is, by using multiple angiography images for blood vessel recognition, more data volume and richer data content are considered, and thus a more comprehensive abdominal aortic blood vessel tree can be generated, that is, the accuracy of blood vessel recognition can be effectively improved.

The balloon catheter blood pump comprises a pump body, a flow guide cone, a tail sleeve, a five-cavity catheter, a balloon and an impeller rotor assembly, the pump body comprises an inflow cage, a middle section and an outflow cage, the outflow cage end of the pump body is connected with the flow guide cone, the flow guide cone is connected with the tail sleeve, the tail sleeve is connected with the five-cavity catheter, and the five-cavity catheter is connected with the impeller rotor assembly. The two ends of the balloon are fixed to the middle section of the pump body in a sleeved mode, five round holes are formed in the cross section of the five-cavity catheter and include two flushing fluid filling holes, a wiring hole, a balloon injection hole and a center hole, the impeller rotor assembly comprises an impeller, an impeller shaft, a bearing and a flexible transmission shaft, the impeller is installed at the far end of the impeller shaft and arranged in the pump body, and the bearing is arranged at the far end of the impeller shaft. A bearing is arranged between the impeller shaft and the inner wall of the flow guide cone, the near end of the impeller shaft is connected with the far end of a flexible transmission shaft, the flexible transmission shaft penetrates through the center hole, a gap a is reserved between the impeller shaft and the flow guide cone in the radial direction, and a gap b communicated with the gap a is reserved between the impeller and the flow guide cone in the axial direction.

This invention relates to a vascular stent for the visceral region of the abdominal aorta, comprising an interconnected proximal non-degradable segment and a distal degradable segment. The proximal non-degradable segment includes a non-degradable metal skeleton and a covering structure. The distal degradable segment is a degradable bare skeleton. The proximal non-degradable segment corresponds to the location of the primary tear in the visceral region of the abdominal aorta, and the distal degradable segment corresponds to the location of branch vessels in the visceral region of the abdominal aorta. This invention is applicable to abdominal aortic dissection anatomical features, where the proximal stent segment is non-degradable and covered, while the distal visceral segment is degradable but not covered. It promotes false lumen thrombosis by sealing the primary tear through covering, while maintaining patency of branch vessels in the visceral segment by not covering. Simultaneously, a drug layer is attached to the covering of the proximal stent segment to actively promote intimal repair.

This invention discloses an experimental rat abdominal aorta fixation and blood collection device, belonging to the field of animal fixation and blood collection technology. It includes an experimental body with an operating table mounted on its upper end. The operating table has a Velcro structure in the middle and an absorbent pad is attached. Four side plates are vertically fixed at the four corners of the experimental body, and supplementary lights are mounted on the opposite sides of each side plate. Four movable slots are formed near the four corners of the operating table, and four magnetic restraint devices are movably connected within these slots. A controller is fixed to the front end of the experimental body and electrically connected to an external power source. This invention provides that the four magnetic restraint devices can be adjusted according to the length of the rat's limbs, and the controller controls four electromagnets to attract two iron blocks on four elastic restraint straps, completing rapid restraint and fixation. The operation is relatively simple and convenient, improving the efficiency of blood collection.

The invention discloses application of salvia miltiorrhiza-kudzu vine root vesicle-like nanoparticles, and belongs to the technical field of biological medicines. Salvia miltiorrhiza-kudzu vine root vesicle-like nanoparticles (SPVLNs) are extracted and purified from a salvia miltiorrhiza-kudzu vine root decoction by adopting a differential ultra-high-speed centrifugation method, and the SPVLNs have good blood compatibility, so that when the SPVLNs are applied to treatment of abdominal aortic aneurysm, the SPVLNs can be used for treating abdominal aortic aneurysm, and the SPVLNs can be used for treating abdominal aortic aneurysm. The traditional Chinese medicine composition is capable of obviously relieving thickening of blood vessel walls, reducing infiltration cells of a middle artery membrane and an outer artery membrane, improving reduction and breakage of elastic fibers of the blood vessel walls, increasing extensibility of the elastic fibers of the blood vessel walls, reducing the content of tissue muscle fibers and collagenous fibers and reducing the fibrosis degree of the collagenous fibers; the pathological change, caused by Ang II, of the abdominal aorta of the mouse is obviously improved, and safety and non-toxicity are achieved.

The present invention discloses a nucleic acid molecule for inhibiting PNO1 gene expression, as well as related products and uses. The nucleic acid molecule comprises double-stranded RNA or shRNA. The present invention utilizes an RNAi method to obtain siRNA, or a nucleic acid construct, viral particle, or cell containing the siRNA sequence. By downregulating PNO1 gene expression, the siRNA can effectively inhibit and significantly reduce systolic blood pressure, diastolic blood pressure, mean arterial pressure, pulse wave velocity, and vascular wall thickness in the abdominal aorta, thereby preventing and / or treating hypertension. The siRNA can be used in drugs for treating hypertension, opening up new avenues for hypertension treatment.

The utility model provides a catheter used for expanding a severe stenosis renal artery opening, the catheter is an elastic catheter, two ends of the catheter are respectively an input port and an output port, the catheter comprises a straight section, a bending section and an attacking section which sequentially extend between the input port and the output port, and the straight section is provided with an opening. The end, away from the input port, of the straight section extends towards one side in the radial direction to form the bent section and the straight section, and the included angle between the axis of the attack section and the axis of the straight section is not larger than 90 degrees. According to the catheter for expanding the severe stenosis renal artery opening, based on the anatomical structure relation between the renal artery and the aorta abdominalis, the attack section located at the head end of the catheter and the telecentric end of the aorta abdominalis form a right angle or an acute angle, and the appearance and the elasticity modulus of the attack section are limited, so that tension and stress of the bent section can be smoothly transferred; and therefore, the needle can easily and smoothly pass through the narrow section of artery during rolling and impact.

Disclosed are an automatic scoring method and an automatic scoring system for abdominal aortic calcification to simulate the doctor's scoring process. The CNN is first used to locate and recognize the aorta from the first lumbar vertebra to the fourth lumbar vertebra and the aorta in the corresponding area, then an improved regression model is used to automatically perform the scoring task. With particular attention to the continuity of sample data, a regression model that can capture the continuity of the intrinsic ordered relationship between samples is designed to ensure that the changing trend of the calcification degree is reflected more accurately. A regression model is constructed based on the intrinsic continuity of samples, which solves the problem of ignoring data continuity in the direct regression method, making the scoring to be more reflective of the continuous changes in calcification severity.

A compression device 300 and non-invasive method for manually compressing the descending abdominal aorta of a patient. The device 300 has a pressure transfer portion 340, with a thickness between 5mm and 20mm, having a smooth external surface 344 and an elastically compliant internal surface 342. The device 300 has a handle portion 322 connected to the pressure transfer portion 340. In use, an adult hand of a practitioner is accommodated in an opening 360 between the handle portion 322 and the internal surface 342 of the pressure transfer portion 340, and the external surface 344 is in contact with the abdomen of the patient. The practitioner applies a compressive force to the pressure transfer portion 340 by contacting the proximal phalanges of their hand with the internal surface 342. The external surface 342 exerts a corresponding compressive force on the abdomen of the patient. The compressive force is substantially evenly distributed across the external surface 342 of the device. The device may be for treating a post-partum haemorrhage due to a retained placenta.

The utility model discloses an aorta abdominalis covered stent and a stent system, and belongs to the technical field of aorta abdominalis covered stents. The utility model provides an aorta abdominalis covered stent which comprises a stent body, and a first through hole, a second through hole and a third through hole are formed in the stent body in the longitudinal direction of a cylinder. The middle section of the support body is provided with an open groove, the second through hole and the third through hole are broken through the open groove, and the first through hole is not broken through the open groove. Therefore, according to the aorta abdominalis covered stent, the aorta abdominalis stent can be communicated with the four branch arteries. The first through hole is not affected by the open groove and penetrates through the stent body, and therefore it can be guaranteed that blood in the aorta abdominalis is smooth all the time. The slotting does not need to be customized according to the condition of a patient, and professional batch production can be realized, so that the manufacturing efficiency and the use reliability are improved.

The vessel forceps comprise a first forceps handle and a second forceps handle, the upper side of the first forceps handle is provided with a rectangular groove, the inner side of the rectangular groove is rotatably connected with a rotating shaft, the rotating shaft is fixedly connected with the second forceps handle, and the rotating shaft is fixedly connected with the second forceps handle. Handle parts are fixedly connected to the outer sides of the first plier handle and the second plier handle, a first clamping block is fixedly connected to one side of the first plier handle, a second clamping block is fixedly connected to the side, close to the first clamping block, of the second plier handle, and a first plier head is fixedly connected to the right side of the first plier handle. According to the vessel forceps suitable for abdominal aorta blocking and catheterization, by arranging the first forceps handle, the second forceps handle, the mounting plate, the side blocks, the contact plates, the pulling plate, the first spring, the second spring, the clamping rod and the clamping hole, when the first forceps head and the second forceps head block a blood vessel, the multiple contact plates can conveniently and rapidly extrude a suction tube through movement of the pulling plate, the blood vessel blocking effect is improved, and operation is easy.

The invention provides a covered stent system for curing total aortic dissection, which comprises a main stent, a large crevasse plugging device and a non-clogging blood flow branch stent, the main stent is used for blocking the crevasse, the main stent comprises a main stent skeleton and a micropore covering film, the large crevasse plugging device is wrapped in the main stent, and the micropore covering film is arranged in the main stent skeleton. The microporous stent is used for supporting the structure of a lesion position with a large crevasse, and the microporous stent is used for enabling some small branch passages to be unblocked; however, if a large crevasse exists at a non-branch position, the micropore of the micropore stent still causes the expansion of the interlayer, and at the moment, a large crevasse plugging device needs to be used. According to the invention, full aorta continuous treatment is realized: the main stent is designed to cover the whole course of thoracico-abdominal aorta and can be connected with an implanted individualized thoracico-aorta stent system to form a complete treatment scheme of the full aorta.

The application discloses an abdominal aorta automatic segmentation method based on a segmentation sampling neural network, and specifically comprises the following steps: obtaining a historical CT sequence scanning image, performing image preprocessing and cutting with a preset size to obtain an original cutting file; inputting the original cutting file into a pre-trained front segmentation network model after down-sampling to perform forward propagation, and obtaining a full receptive field prediction file; performing global segmentation sampling on the original cutting file based on a segmentation step to obtain a plurality of first sub-domain files; performing local segmentation sampling on the original cutting file based on the segmentation step to obtain a plurality of second sub-domain files; constructing and training a sub-domain prediction network model, wherein the sub-domain prediction network model takes the full receptive field prediction file, all the first sub-domain files and all the second sub-domain files as inputs; and using the front segmentation network model and the trained sub-domain prediction network model to perform target segmentation on a real-time CT sequence scanning image to obtain a voxel segmentation model of the abdominal aorta.

Described herein are pumps that linearly reciprocate to assist with circulating blood within the body of a patient. Red blood cell damage may be avoided or minimized by such linear pump movement. The linearly reciprocating movement may also generate a pulsatile pumping cycle that mimics the natural pumping cycle of the heart. The pumps may be configured to reside at various body locations. For example, the pumps may be situated within the right ventricle, the left ventricle, the ascending aorta, the descending aorta, the thoracic aorta, or the abdominal aorta. In some instances, the pump may be deployed within the venous circulation. In other instances, the pump may reside outside the patient.