CN114642523A - Elastic spring type ventricular contraction auxiliary device and personalized customization method thereof - Google Patents
Elastic spring type ventricular contraction auxiliary device and personalized customization method thereof Download PDFInfo
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2469—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body with resilient valve members, e.g. conical spiral
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2478—Passive devices for improving the function of the heart muscle, i.e. devices for reshaping the external surface of the heart, e.g. bags, strips or bands
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/24—Heart valves ; Vascular valves, e.g. venous valves; Heart implants, e.g. passive devices for improving the function of the native valve or the heart muscle; Transmyocardial revascularisation [TMR] devices; Valves implantable in the body
- A61F2/2496—Devices for determining the dimensions of the prosthetic valve to be implanted, e.g. templates, sizers
Abstract
The invention discloses an elastic spring type ventricular contraction auxiliary device and a personalized customization method thereof. The device is used for being attached to the outer surface of the heart to assist the heart of a heart failure patient to contract and comprises an elastic spring, an upper fixed elastic wire and a lower fixed elastic wire; the elastic spring is made of elastic memory alloy, and the size of the elastic spring in a natural state is smaller than the size of the outer contour of the heart at the end of systole; the elastic spring comprises a plurality of main spring wires arranged according to the shape of the outer surface of the heart, and a top ring and a bottom ring which are respectively connected with two adjacent main spring wires; the upper fixed elastic wire sequentially penetrates through the top rings and is sealed into a ring shape; the lower fixed elastic wire sequentially passes through the bottom rings and is sealed into a ring. According to the invention, a three-dimensional geometric model of the heart of the patient is reconstructed according to the systolic image of the image class examination of the heart failure patient, and the geometric model of the elastic spring is customized individually according to the illness state of the patient; thereby obtaining the individually customized elastic spring type ventricular contraction auxiliary device.
Description
Technical Field
The invention relates to the technical field of medical instruments, in particular to an elastic spring type ventricular contraction auxiliary device and a personalized customization method thereof.
Background
The heart failure is a disease seriously harming the health and life of patients, patients with severe end-stage heart failure cannot be effectively treated by medicines, and heart transplantation cannot meet the requirements of a plurality of patients due to insufficient donors, so the ventricular assist device becomes an effective means for treating the end-stage heart failure. Studies have shown that the two-year survival rate of patients implanted with ventricular assist devices is substantially comparable to heart transplantation. The heart failure of patients with moderate heart failure can be only delayed to develop severe heart failure through medication and can not be reversed, the heart of the patients can be directly unloaded by the ventricular assist device, the heart function of the patients can be enhanced, and the heart failure of the patients can be reversed through long-term unloading of the ventricular assist device. The development of a ventricular assist device suitable for patients with moderate and severe heart failure can save the lives of a large number of patients with heart failure.
Most of ventricular assist devices on the market at present do work by rotating an impeller to generate blood flow, so that blood circulation of a patient is enhanced. The device is divided into a long-term ventricular assist device and a short-term ventricular assist device according to the assist time, wherein the short-term ventricular assist device is mainly used for treating patients with acute heart failure or protecting high-risk percutaneous coronary stent implantation, and the long-term ventricular assist device is mainly used for transition or final treatment of end-stage heart failure. The long-term ventricular assist device is mostly of a blood contact type, because parts in the device are in contact with blood for a long time and do work on the blood, the phenomenon of blood damage caused by mechanical force is easy to generate, and the conventional long-term ventricular assist device is large in damage to patients, complex in adverse events and high in incidence rate, and is not suitable for patients with moderate heart failure. Therefore, the above problems of the current long-term heart assist device limit the clinical application of the device, and no heart assist apparatus suitable for patients with moderate heart failure exists at present.
Therefore, the invention provides the non-blood contact type ventricular assist device which can be customized in a personalized way and is suitable for patients with moderate and severe heart failure, and has important significance for solving the problem of blood damage of the traditional ventricular assist device and providing a novel treatment mode for the patients with moderate heart failure.
Disclosure of Invention
The invention aims to provide an elastic spring type ventricular contraction auxiliary device which can be customized according to the heart size of a heart failure patient, assists the heart contraction, increases the cardiac output and passively eliminates lead infection, and aims to overcome the defects that various adverse events such as blood damage and the like are easily caused by the contact of the traditional ventricular auxiliary device and blood, the life of the patient is threatened by the stop and rotation of a blood pump supplied by an external power supply, the pulsating type physiological characteristic blood circulation assistance cannot be provided, the patient has large wound due to the implantation (including withdrawal) of a chest opening operation, and the traditional ventricular auxiliary device cannot be suitable for the moderate heart failure patient due to high adverse event occurrence rate.
Another object of the present invention is to provide a method for individually customizing the elastic spring type ventricular contraction assisting device.
In order to achieve the purpose, the invention adopts the following technical scheme:
an elastic spring type ventricular contraction auxiliary device is used for being attached to the outer surface of a heart to assist the heart of a heart failure patient to contract and comprises an elastic spring, an upper fixed elastic wire and a lower fixed elastic wire; the elastic spring is made of elastic memory alloy, and the size of the elastic spring in a natural state is smaller than the size of the outer contour of the heart at the end of systole; the elastic spring comprises a plurality of main spring wires arranged according to the shape of the outer surface of the heart, and a top ring and a bottom ring which are respectively connected with two adjacent main spring wires; the upper fixed elastic wire sequentially penetrates through the top rings and is sealed into a ring shape; the lower fixed elastic wire sequentially passes through the bottom rings and is sealed into a ring.
Whereby, in a state in which the device is mounted on the outer surface of the heart, and when the heart contracts to a minimum volume, the spring is in an outwardly compressed pre-expanded state; the spring is compressed to expand outward and store elastic energy during diastole, and releases the elastic energy to rebound during systole, so that the spring is tightly attached to the outer surface of the heart during the whole diastole and systole.
Preferably, the main spring wires are integrally formed with the top ring and the bottom ring, and two adjacent main spring wires share one top ring or one bottom ring.
Preferably, the diameters of the main spring wires, the upper fixed elastic wires and the lower fixed elastic wires are 0.5mm-2mm respectively.
Preferably, the number of the main spring wires is 8-40.
A personalized customization method of the elastic spring type ventricular contraction auxiliary device specifically comprises the following steps:
(1) reconstructing a three-dimensional geometric model of the heart of the patient according to the image of the heart failure patient in the systole, which is examined by the image class, and extracting an outer contour geometric model at the end systole;
(2) comparing the heart volume of the heart failure patient with the normal heart volume to determine the reduction amount of the geometric model of the outer contour of the heart, reducing the geometric model of the outer contour at the end of systole according to the determined reduction amount according to the illness state of the patient, and taking the reduced geometric model of the outer contour of the heart as a geometric model of an individualized customized elastic spring;
(3) the elastic spring with the geometric characteristics of the individualized heart of the patient is manufactured by adopting the elastic memory alloy.
Preferably, in the step (1), a three-dimensional geometric model of the heart failure patient is obtained by performing image processing, extraction and three-dimensional reconstruction on a systolic chest CT or nuclear magnetic examination image sequence of the heart failure patient.
Preferably, in the step (1), each systolic CT examination image is orderly arranged according to a spatial axis, a gray level region representing human fat and muscle tissue in each image is extracted according to the characteristic that a gray level range in each image corresponds to different tissues, muscle and fat regions of the whole chest are extracted from an image sequence group, and three-dimensional reconstruction is performed on the muscle and fat regions to obtain three-dimensional geometric models of the chest wall and each organ in the chest; secondly, manually operating in the muscle and fat area of each image and the generated three-dimensional geometric model to remove the geometric structures of muscle and fat components representing other organs and the chest wall except the heart, and then performing boundary smoothing and burr removal processing on the image boundary area representing the muscle and fat on the outer surface of the heart in each image and the three-dimensional geometric model; and finally, carrying out three-dimensional model reconstruction and smoothing treatment on the image sequence group to obtain a three-dimensional geometric model of the heart.
The invention has the beneficial effects that:
the elastic spring type ventricular contraction auxiliary device can be compressed to the minimum state to be implanted into the thoracic cavity through a small incision of the thoracic wall, so that open thoracic surgery is avoided, and trauma of a patient during the implantation surgery can be reduced; due to the characteristics of the memory alloy, the elastic spring type ventricular contraction auxiliary device does not deform after being implanted and recovering the natural state; compared with the traditional constant-current artificial heart, the pulsating type blood circulation physiological characteristics of the patient can be maintained by assisting the heart to contract in a manner of expanding and storing elastic energy and rebounding and releasing the elastic energy through the elastic spring type ventricular contraction assisting device; the elastic spring type ventricular contraction auxiliary device does not need an external power supply, avoids lead infection, and does not have the faults of pump stall and the like of the traditional ventricular auxiliary device; because the trauma is small, the maintenance is not needed, and the reliability is high, the elastic spring type ventricular contraction auxiliary device can be suitable for patients with moderate heart failure, so that the heart failure is gradually recovered and reversed.
The elastic spring type ventricular contraction auxiliary device is a heart contraction auxiliary instrument which is customized in a personalized manner by adopting an elastic spring which can rebound after expansion according to a geometric model after the heart of a heart failure patient is reduced properly, has high fitting degree with the heart of the patient, is favorable for enhancing effective and targeted pressing on the heart of the patient and reducing damage of the device to the surface of the heart.
Drawings
Fig. 1 is a schematic structural diagram of an elastic spring in the elastic spring type ventricular contraction auxiliary device of the present invention.
Fig. 2 is a schematic structural view of the upper and lower fixed elastic wires in the elastic spring type ventricular contraction auxiliary device of the present invention.
Fig. 3 is a schematic diagram of an image of a chest CT examination of a heart failure patient.
Fig. 4 is a schematic diagram showing the entire muscle and fat region in a CT image of a chest.
Fig. 5 is a schematic diagram of the chest CT examination image of fig. 4 showing primarily the muscle and fat in the heart region.
Fig. 6 is a schematic structural diagram of a three-dimensional geometric model of a heart failure patient reconstructed in three dimensions.
Fig. 7 is a schematic structural diagram of the personalized elastic spring type ventricular contraction assisting device mounted on the outer surface of the heart.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The elastic spring type ventricular contraction auxiliary device is used for being attached to the outer surface of the heart to assist the contraction of the heart. As shown in fig. 1, 2 and 7, the device comprises an elastic spring 1, an upper fixed elastic wire 2 and a lower fixed elastic wire 3; wherein, the elastic spring 1 is made of elastic memory alloy, and the size of the elastic spring in a natural state is smaller than the size of the outer contour of the heart at the end of systole; the elastic spring 1 comprises a plurality of main spring wires 12 arranged according to the shape of the outer surface of the heart, and a top ring 11 and a bottom ring 13 which are respectively connected with two adjacent main spring wires; the upper fixing elastic wire 2 sequentially penetrates through the top rings 11 and is closed into a ring shape for fixing on the outer surface of the heart close to the artery; the lower fixing elastic wire 3 sequentially passes through the plurality of bottom rings 13 and is closed into a ring shape for fixing to the outer surface of the heart at the apex of the heart.
Whereby, in a state in which the device is mounted on the outer surface of the heart, and when the heart contracts to a minimum volume, the spring is in an outwardly compressed pre-expanded state; the spring is compressed to expand outwards and store elastic energy in diastole, and releases elastic energy to rebound in systole, so that the spring is tightly attached to the outer surface of the heart in the whole diastole and systole.
The elastic spring type ventricular contraction auxiliary device adopts the elastic spring which is expanded under pressure and then rebounds to release elastic energy to assist the contraction of the heart, and the elastic spring is fixed on the outer surface of the heart through the upper fixed elastic wire and the lower fixed elastic wire; when the patient's heart contracts, the elastic spring with stored elastic energy rebounds inwards along with the contracting heart to release elastic energy to assist the heart to contract, and the upper and lower fixed elastic wires contract along with the contracting heart to enable the elastic spring to be attached to the surface of the heart.
In the elastic spring type ventricular contraction auxiliary device, the material of the elastic spring comprises but is not limited to memory alloys such as nickel-titanium alloy with good blood compatibility; the materials of the upper fixing elastic wire and the lower fixing elastic wire include, but are not limited to, silicone rubber with good blood compatibility and elasticity, and the like. The wire diameter of the main spring wire and the upper and lower fixed elastic wires is between 0.5mm and 2 mm. The top ring 11, the main spring wires 12 and the bottom ring 13 of the elastic spring 1 can be designed into an integrally formed structure, and can also be connected in a welding mode and the like; two adjacent main spring wires 12 share one top ring 11 or one bottom ring 13, that is, the two adjacent main spring wires and the corresponding top ring or bottom ring form a substantially V-shape.
The invention provides a method for customizing the elastic spring type ventricular contraction auxiliary device according to the heart size of a heart failure patient. The customization method adopts a chest CT (or nuclear magnetism) examination image sequence of a heart failure patient in a systole to carry out image processing, extraction and three-dimensional reconstruction to obtain a three-dimensional geometric model of the heart failure patient, and extracts an outer contour geometric model of the end systole; comparing the heart volume of the heart failure patient with the normal heart volume to determine the reduction amount of the geometric model of the outer contour of the heart, reducing the geometric model of the outer contour at the end of systole according to the determined reduction amount according to the illness state of the patient, and taking the reduced geometric model of the outer contour of the heart as a geometric model of an individualized customized elastic spring; the elastic spring with the individualized heart geometric characteristics of the patient is manufactured by adopting the elastic memory alloy. Referring to fig. 3 to 6, the specific implementation of the customization method is: first, arranging each contraction period CT examination image orderly according to a spatial axis, and extracting gray-scale regions representing human fat and muscle tissues in each image according to the characteristics of different tissues corresponding to gray-scale value ranges in each image (for example, a dark gray portion A1 in FIG. 4 represents muscle tissues, a light gray portion B1 represents fat tissues, a light gray portion A2 in FIG. 5 represents muscle tissues, and a dark gray portion B2 represents fat tissues). And extracting muscle and fat regions of the whole chest from the image sequence group, and performing three-dimensional reconstruction on the muscle and fat regions to obtain three-dimensional geometric models of the chest wall and each organ in the chest. Then, the geometric structures of muscle and fat components representing other organs and the chest wall except the heart are removed through manual operation in the muscle and fat area of each image and the generated three-dimensional geometric model, then, the image boundary area representing the muscle and fat on the outer surface of the heart is subjected to treatment such as boundary smoothing and burr removal in each image and the three-dimensional geometric model, finally, the three-dimensional model reconstruction and smoothing treatment are carried out on the image sequence group, the three-dimensional geometric model of the heart is obtained (as shown in figure 6), the heart outer contour geometric model obtained through three-dimensional reconstruction is extracted, the outline of the geometric model of the heart outer contour is properly reduced to be used as the geometric model of the elastic spring according to the illness state of the patient, and finally, the elastic spring with the individualized heart geometric characteristics of the patient is manufactured through the elastic memory alloy.
The elastic spring type ventricular contraction auxiliary device can be compressed to a smaller size and implanted into the thoracic cavity through a small incision on the thoracic wall, and the specific implantation process is as follows: the device is compressed and then implanted into the chest cavity through a small incision on the chest wall, the elastic spring is restored to the natural state after the device is implanted, the elastic spring is spread to push the sleeve upwards from the apex position of the heart and is tightly attached to the outer surface of the heart by adjusting the individually customized elastic spring 1. For convenient operation, the upper fixed elastic wire is in a disconnected state when being implanted, passes through part of the top ring, and is closed into a ring after the elastic spring is integrally sleeved on the outer surface of the heart. At this time, as shown in fig. 7, a plurality of (for example, 8 to 40) main spring wires 12 are attached to the outer surface of the heart 4, and the upper fixing elastic wire 2 passing through the top ring 11 and the lower fixing elastic wire 3 passing through the bottom ring 13 fix the entire device to the outer surface of the heart 4 to prevent falling off; the size of the elastic spring 1 in a natural state is smaller than the size of the outer contour of the heart at the end of systole, so that good fit with the heart can be ensured, when the heart chamber is in diastole, the main spring wires 12 are outwards expanded by the outwards extrusion force generated by the expansion of the heart, the upper fixed elastic wire 2 and the lower fixed elastic wire 3 are also lengthened accordingly, the main spring wires 12 store elastic energy, when the heart contracts, the main spring wires 12 rebound inwards to release the elastic energy to assist the contraction of the heart, the upper fixed elastic wire 2 and the lower fixed elastic wire 3 are also contracted accordingly, and the elastic spring can be prevented from falling off from the outer surface of the heart when the heart moves greatly.
The elastic spring type ventricular contraction auxiliary device can be compressed to the minimum state to be implanted into the chest cavity through the small incision of the chest wall, so that an open chest operation is avoided, and the trauma of a patient during the implantation operation can be reduced; due to the characteristics of the memory alloy, the elastic spring type ventricular contraction auxiliary device does not deform after being implanted and recovering the natural state; compared with the traditional constant-current artificial heart, the pulsating type blood circulation physiological characteristics of the patient can be maintained by assisting the heart to contract in a manner of expanding and storing elastic energy and rebounding and releasing the elastic energy through the elastic spring type ventricular contraction assisting device; the elastic spring type ventricular contraction auxiliary device does not need an external power supply, avoids lead infection, and does not have the faults of pump stall and the like of the traditional ventricular auxiliary device; because the trauma is small, the maintenance is not needed, and the reliability is high, the elastic spring type ventricular contraction auxiliary device can be suitable for patients with moderate heart failure, so that the heart failure is gradually recovered and reversed.
The elastic spring type ventricular contraction auxiliary device is a heart contraction auxiliary instrument which is customized in a personalized manner by adopting an elastic spring which can rebound after expansion according to a geometric model after the heart of a heart failure patient is reduced properly, has high fitting degree with the heart of the patient, is favorable for enhancing effective and targeted pressing on the heart of the patient and reducing damage of the device to the surface of the heart.
Finally, it should be understood that the above-mentioned embodiments are not intended to limit the present invention, and any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An elastic spring type ventricular contraction assisting device is characterized in that the device is used for being attached to the outer surface of the heart to assist the heart of a heart failure patient to contract, and comprises an elastic spring, an upper fixed elastic wire and a lower fixed elastic wire; the elastic spring is made of elastic memory alloy, and the size of the elastic spring in a natural state is smaller than the size of the outer contour of the heart at the end of systole; the elastic spring comprises a plurality of main spring wires arranged according to the shape of the outer surface of the heart, and a top ring and a bottom ring which are respectively connected with two adjacent main spring wires; the upper fixed elastic wire sequentially penetrates through the top rings and is sealed into a ring shape; the lower fixed elastic wire sequentially passes through the bottom rings and is sealed into a ring.
2. An elastically sprung ventricular assist device as claimed in claim 1, wherein the main spring wires are integrally formed with the top and bottom rings, and two adjacent main spring wires share one top or one bottom ring.
3. An elastically sprung ventricular assist device as claimed in claim 1, wherein the diameters of the main spring wires, the upper fixed spring wire and the lower fixed spring wire are 0.5mm to 2mm, respectively.
4. An elastically-sprung ventricular contraction assist device as claimed in claim 1, wherein the number of the plurality of main spring wires is 8-40.
5. A method for individualizing a sprung ventricular contraction assist device as claimed in any one of claims 1 to 4, the method comprising the steps of:
(1) reconstructing a three-dimensional geometric model of the heart of the patient according to the image of the heart failure patient in the systole, which is examined by the image class, and extracting an outer contour geometric model at the end systole;
(2) comparing the heart volume of the heart failure patient with the normal heart volume to determine the reduction amount of the geometric model of the outer contour of the heart, reducing the geometric model of the outer contour at the end of systole according to the determined reduction amount according to the illness state of the patient, and taking the reduced geometric model of the outer contour of the heart as a geometric model of an individualized customized elastic spring;
(3) the elastic spring with the individualized heart geometric characteristics of the patient is manufactured by adopting the elastic memory alloy.
6. A personalized method of an elastic spring type ventricular contraction assistance device according to claim 5, wherein in the step (1), the three-dimensional geometric model of the heart failure patient is obtained by image processing, extraction and three-dimensional reconstruction using the systolic chest CT or nuclear magnetic examination image sequence of the heart failure patient.
7. The personalized customization method of the elastic spring type ventricular contraction auxiliary device according to claim 6, characterized in that each contraction phase CT examination image is orderly arranged according to a spatial axis, a gray scale region representing human fat and muscle tissue in each image is extracted according to the characteristics that the gray scale value range in each image corresponds to different tissues, muscle and fat regions of the whole chest are extracted from the image sequence group, and the muscle and fat regions are three-dimensionally reconstructed to obtain three-dimensional geometric models of the chest wall and each organ in the chest; secondly, manually operating in the muscle and fat area of each image and the generated three-dimensional geometric model to remove the geometric structures of muscle and fat components representing other organs and the chest wall except the heart, and then performing boundary smoothing and burr removal processing on the image boundary area representing the muscle and fat on the outer surface of the heart in each image and the three-dimensional geometric model; and finally, carrying out three-dimensional model reconstruction and smoothing treatment on the image sequence group to obtain a three-dimensional geometric model of the heart.
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| WO2013133427A1 (en) * | 2012-03-09 | 2013-09-12 | 学校法人金沢医科大学 | Manufacturing method for heart correction net |
| CN218528986U (en) * | 2022-02-15 | 2023-02-28 | 源深(深圳)医疗器械有限责任公司 | Elastic spring type ventricular contraction auxiliary device |
| CN116407359A (en) * | 2021-12-31 | 2023-07-11 | 源深(深圳)医疗器械有限责任公司 | Auxiliary apparatus for heart contraction |
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| US20040002626A1 (en) * | 2001-07-16 | 2004-01-01 | Yair Feld | In-vivo method and device for improving diastolic function of the left ventricle |
| US20110257461A1 (en) * | 2008-10-20 | 2011-10-20 | Corassist Cardiovascular Ltd. | Ventricular function assisting device and a method and apparatus for implanting it |
| WO2013133427A1 (en) * | 2012-03-09 | 2013-09-12 | 学校法人金沢医科大学 | Manufacturing method for heart correction net |
| CN116407359A (en) * | 2021-12-31 | 2023-07-11 | 源深(深圳)医疗器械有限责任公司 | Auxiliary apparatus for heart contraction |
| CN218528986U (en) * | 2022-02-15 | 2023-02-28 | 源深(深圳)医疗器械有限责任公司 | Elastic spring type ventricular contraction auxiliary device |
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