CN222899996U - Catheter type ventricular assist system - Google Patents
Catheter type ventricular assist system Download PDFInfo
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- CN222899996U CN222899996U CN202420835057.2U CN202420835057U CN222899996U CN 222899996 U CN222899996 U CN 222899996U CN 202420835057 U CN202420835057 U CN 202420835057U CN 222899996 U CN222899996 U CN 222899996U
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Abstract
The utility model relates to a catheter type ventricular assist system capable of providing different flow rates and having small wounds, which comprises a single-channel double-cavity cannula and a single-channel single-cavity cannula, wherein the single-channel double-cavity cannula comprises an inner tube and an outer tube, the proximal end of the inner tube is communicated with an inlet tube of a blood pump, an outlet tube of the blood pump is communicated with the proximal end of the outer tube or the proximal end of the single-channel single-cavity cannula, blood is sucked from a blood inflow opening at the distal end of the inner tube and flows out from a blood outflow opening at the distal end of the outer tube to form a small-flow circulation assist system, and blood is sucked from a blood inflow opening at the distal end of the inner tube and flows out from a distal opening of the single-channel single-cavity cannula to form a large-flow circulation assist system. Through the mode that outer tube and single channel single chamber intubate switch, can realize that a set of ventricle auxiliary device satisfies little flow cycle and supplementary and the big flow cycle is supplementary, adaptation different scenes. In the low-flow circulation assistance, the outer tube and the inner tube are single-channel double-cavity cannulas, and only one incision is needed, so that the single-channel double-cavity cannulas can be inserted into the appointed position, the wound is small, and the postoperative recovery is fast.
Description
Technical Field
The utility model relates to the technical field of medical appliances, in particular to a catheter type ventricular assist system.
Background
Ventricular assist devices are life support techniques for partially or completely replacing the function of a failing heart, and are active blood circulation support devices. Left ventricular assist devices are typically inserted into the patient by way of two separate catheters that are percutaneously implanted to pump blood from the left ventricle to the aorta via a blood pump, but both catheters create two traumatic wounds that increase the risk of surgical infection. And the pump blood flow of the same ventricular assist device is determined and cannot be adapted to different needs of patients.
Disclosure of utility model
It is an object of the present utility model to provide a catheter-based ventricular assist system that is capable of providing different flow rates and is less invasive.
In order to achieve the aim, the catheter type ventricular assist system comprises a single-channel double-cavity cannula, a single-channel single-cavity cannula and a blood pump, wherein the single-channel double-cavity cannula comprises an inner tube and an outer tube, the proximal end of the inner tube is communicated with an inlet tube of the blood pump, an outlet tube of the blood pump is communicated with the proximal end of the outer tube or the proximal end of the single-channel single-cavity cannula, blood is sucked from a blood inflow opening at the distal end of the inner tube and flows out from a blood outflow opening at the distal end of the outer tube to form a small-flow circulation assist system, and blood is sucked from a blood inflow opening at the distal end of the inner tube and flows out from a distal opening of the single-channel single-cavity cannula to form a large-flow circulation assist system.
The outer tube is a flexible membrane, the distal end of the flexible membrane is welded and fixed with the outer wall of the inner tube, the proximal end of the flexible membrane is pulled away from the inner tube to form a branch structure, the boundary is sealed, an annular cavity between the inner tube and the outer tube forms a blood return cavity, and the blood outflow port is formed at the distal end of the flexible membrane.
The outer tube is a hose, the proximal end of the outer tube is drawn away from the inner tube to form a branch structure and the boundary is sealed, a nickel titanium wire woven net is embedded at the distal end of the hose and is fixed with the inner tube, an annular chamber between the inner tube and the outer tube forms a blood return cavity, and a blood outflow port is arranged at the distal end position of the hose.
The inner tube is made of materials with different rigidities in the length direction, or the inner tube is made of the same material and is embedded with a reinforcing bracket in the far tube, and the reinforcing bracket is a nickel-titanium alloy woven net or a nickel-titanium alloy spiral line.
The sectional area of the inner cavity of the single-channel single-cavity cannula is larger than the effective sectional area of the cavity between the inner pipe and the outer pipe, the pump blood flow of the small-flow circulation auxiliary system is 1L/min, and the flow of the large-flow circulation auxiliary system is 3L/min.
The blood outflow port is uniformly and alternately provided with a plurality of blood flow guiding members along the circumferential direction, and the blood flow guiding members are arranged at the blood outflow port and guide the blood to flow from the descending aorta to the downstream.
The flow guiding piece is arranged outside the blood outflow opening in a split mode, the whole flow guiding piece is valve-shaped, and the flow guiding piece is warp-shaped under the impact action of blood.
The flow guiding piece is of an integral horn-shaped structure, and the large opening side is covered on the periphery of the blood outflow opening towards the proximal end.
The outlet pipe of the blood pump is connected with a two-position three-way electromagnetic valve, the inlet of the two-position three-way electromagnetic valve is connected with the outlet pipe, the two outlets are respectively connected with the proximal end of the outer pipe and the proximal end of the single-channel single-cavity cannula, when the two-position three-way electromagnetic valve is powered off, the outlet pipe of the blood pump is communicated with the outer pipe, and when the two-position three-way electromagnetic valve is powered on, the outlet pipe of the blood pump is communicated with the single-channel single-cavity cannula.
In the scheme, the device at least has the following beneficial effects:
Through the mode that outer tube and single channel single chamber intubate switch, can realize that a set of ventricle auxiliary device satisfies little flow cycle and supplementary and the big flow cycle is supplementary, adaptation different scenes.
The pump blood flow of the small-flow circulation auxiliary system is 1L/min, and the flow of the large-flow circulation auxiliary system is 3L/min, which corresponds to the blood flow under typical physiological pressure.
In the low-flow circulation is supplementary, outer tube and inner tube are single channel double-cavity intubate, and holistic diameter is less, and only need open an incision in femoral artery department, can intervene single channel double-cavity intubate to the assigned position, and the wound is little, and postoperative resumes soon.
The outer tube and the single-channel single-cavity cannula are rapidly and stably switched by electrifying and de-electrifying the two-position three-way electromagnetic valve.
When large-flow circulation assistance is needed, the blood supply of the small-flow circulation assistance system is not stopped in the whole process of single-channel single-cavity intubation intervention, and the other way around is the reverse, so that the blood supply of a human body is ensured.
The flexible film is used as an outer tube, so that the tension of the incision at the femoral artery is reduced while the blood injury is reduced, and the incision is protected.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a single-channel dual-lumen cannula and a single-channel single-lumen cannula;
FIG. 2 is a schematic illustration of the use of a catheter-based ventricular assist system in the heart;
FIG. 3 is a schematic view of the structure of a single-channel dual-lumen cannula in example 1;
FIG. 4 is a schematic view of the structure of a single-channel dual-lumen cannula in example 2;
FIGS. 5 and 6 are partially enlarged schematic views of FIG. 4;
FIG. 7 is a schematic diagram of a blood pump;
Fig. 8 is a schematic diagram of the overall structure of an embodiment of a ventricular assist system.
Detailed Description
For ease of understanding, reference will first be made to the orientations of "proximal", "proximal" and "distal" with respect to the side proximal to the operator/physician and "distal" with respect to the side distal to the operator/physician, i.e., the side proximal to the heart, and the utility model will be discussed in further detail below in connection with FIGS. 1-7.
As shown in fig. 1 and 2, a catheter-type ventricular assist system comprises a single-channel double-cavity cannula 10, a single-channel single-cavity cannula 20 and a blood pump 30, wherein the single-channel double-cavity cannula 10 comprises an inner tube 11 and an outer tube 12, the proximal end of the inner tube 11 is communicated with an inlet tube 31 of the blood pump 30, an outlet tube 32 of the blood pump 30 is communicated with the proximal end of the outer tube 12 or the proximal end of the single-channel single-cavity cannula 20, blood is sucked from a blood inflow port a at the distal end of the inner tube 11 and flows out from a blood outflow port b at the distal end of the outer tube 12 to form a small-flow circulation assist system, and blood is sucked from a blood inflow port a at the distal end of the inner tube 11 and flows out from an opening at the distal end of the single-channel single-cavity cannula 20 to form a large-flow circulation assist system.
The small flow circulation auxiliary system comprises the working processes that the proximal end of an inner tube 11 is communicated with an inlet tube 31 of a blood pump 30, the proximal end of an outer tube 12 is communicated with an outlet tube 32 of the blood pump 30, a single-channel double-cavity cannula 10 is inserted from a femoral incision, the inner tube 11 is inserted into a left ventricle, a blood outlet b of the outer tube 12 just reaches the descending aorta position along with the arrival of the inner tube 11 at the ventricle, the blood pump 30 is started, blood in the ventricle is sucked into the inner tube 11 from the blood inlet a, and returns from an annular chamber between the inner tube 11 and the outer tube 12 after the blood pump 30 circulates outside the body, and finally enters into a descending aorta from a blood outlet b at the distal end of the outer tube 12, and then blood is supplied to the whole body through branch vessels on the artery. The single-channel double-cavity cannula 10 can be inserted into a designated position only by making an incision at the femoral artery, so that the wound is small and the postoperative recovery is quick. The outer diameter of the whole single-channel double-cavity cannula 10 is limited by the inner diameter of the femoral artery blood vessel, and the inner tube 11 is arranged in the outer tube 12, so that only an annular cavity between the two can convey blood, the effective interface agent is slightly smaller, and the blood flow conveyed under the structure is small.
The working process of the large-flow circulation auxiliary system comprises the steps that the proximal end of an inner tube 11 is communicated with an inlet tube 31 of a blood pump 30, the proximal end of a single-channel single-cavity cannula 20 is communicated with an outlet tube 32 of the blood pump 30, the single-channel double-cavity cannula 10 is inserted into a left ventricle from a left femoral incision, the inner tube 11 is inserted into a left ventricle, the single-channel single-cavity cannula 20 is inserted into a descending aorta from a right femoral incision, the blood pump 30 is started, blood in the ventricle is sucked into the inner tube 11 from a blood inflow port a, and after the blood pump 30 circulates outside the body, the blood enters the descending aorta from a distal end opening of the single-channel single-cavity cannula 20, and then the blood is supplied to the whole body through each branch blood vessel on the artery. In this solution, incisions are made in both femoral arteries, the inner tube 11 and the single-channel single-lumen cannula 20 are separately introduced to the designated site, but the trauma is also small and the postoperative recovery is rapid. Because the lumens of the single-channel single-lumen cannula 20 are all large in effective cross-sectional area, high-flow pumping can be achieved.
By means of switching the outer tube 12 and the single-channel single-cavity cannula 20, a set of ventricular assist device can be used for achieving small-flow circulation assistance and large-flow circulation assistance, and different scenes can be met. And in the low-flow circulation is supplementary, outer tube 12 and inner tube 11 are single channel double-chamber intubate, and holistic diameter is less, and only need open an incision in femoral artery department, can intervene single channel double-chamber intubate 10 to the assigned position, and the wound is little, and postoperative resumes soon.
Examples
Referring to fig. 3, the outer tube 12 is a flexible film, such as a TPU film, the distal end of the flexible film is welded and fixed to the outer wall of the inner tube 11, the proximal end is drawn away from the inner tube 11 to form a branching structure, and the boundary is sealed, the annular chamber between the inner tube 11 and the outer tube 12 forms a blood return chamber, and the blood outlet b is opened at the distal end of the flexible film. The flexible membrane is folded and wrapped on the periphery of the inner tube 11 during intervention and extraction, the diameter of the whole single-channel double-cavity cannula 10 is small, and the damage to blood vessels during the intervention is small. In the normal blood pumping process, due to the soft characteristic of the membrane, on one hand, the blood damage can be reduced, on the other hand, the tension of the incision at the femoral artery can be reduced, the membrane at the incision is partially expanded, and the membranes at other parts are fully expanded, namely, the inner diameter of the flexible membrane at the incision is smaller than the inner diameter of the external flexible membrane section and is also smaller than the inner diameter of the intravascular flexible membrane section.
Examples
With reference to fig. 4-5, the outer tube 12 is a hose, such as a TPU tube, with a smooth surface and good elasticity and flexibility. The proximal end of the outer tube 12 is drawn away from the inner tube 11 to form a branch structure, and the boundary is sealed, the distal end of the hose is embedded with a nickel titanium wire woven net 121 and is fixed with the inner tube 11, the two can be firmly connected through gluing and/or a fixing ring, an annular chamber between the inner tube 11 and the outer tube 12 forms a blood return cavity, and a blood outflow port b is arranged at the distal end position of the hose. A nickel titanium wire woven net 121 is additionally arranged at the distal end of the hose, so that the connection firmness is ensured, and the smoothness of the blood outflow port b can be ensured.
The inner tube 11 is made of different stiffness materials in its length direction, or the inner tube 11 is made of the same material and is embedded with a reinforcing bracket 111 (at least at the overbend and distal position) in the distal tube, as shown in fig. 6, to prevent collapse of the inner tube 11 upon suction and buckling of the inner tube 11 upon overbending. The reinforcing bracket 111 is a nickel-titanium alloy woven net or a nickel-titanium alloy spiral line, and the nickel-titanium alloy has shape memory property and can be preformed in vitro so as to meet the physiological structure of a human body.
The tube diameters of the inner tube 11, the outer tube 12 and the single-channel single-cavity cannula 20 are selected to be matched with the flow rates corresponding to typical physiological pressures, such as the minimum blood flow rate of 1L/min and the maximum blood flow rate of 3L/min under 90mmHg, so that the inner cavity cross-sectional area of the single-channel single-cavity cannula 20 is larger than the effective cross-sectional area of a cavity between the inner tube 11 and the outer tube 12, the pump blood flow rate of the small-flow circulation auxiliary system is 1L/min, and the flow rate of the large-flow circulation auxiliary system is 3L/min.
In order to improve the uniformity of the blood injection into the descending aorta, a plurality of blood outflow openings b are uniformly and alternately arranged along the circumferential direction, and the blood outflow openings b are as close to the distal end as possible, so that the formation of a blood recirculation area is avoided. In order to adjust the flow direction of blood, the blood outlet b is provided with a flow guiding member (not shown in the figure), and the flow guiding member guides the blood to flow from the descending aorta to the downstream, which is consistent with the flow direction of the blood pumped by the heart, accords with the hemodynamics, and simultaneously can prevent the blood from directly colliding with the vessel wall and protect the vessel.
The flow guide members are arranged in various modes, wherein one of the flow guide members is arranged outside the blood outflow port b in a split mode, the whole flow guide member is valve-shaped, and the flow guide member is warped under the impact action of blood. The split-type flow guiding piece not only can guide blood, but also can enable the original blood to flow through gaps among different valves, and has no influence on the blood flow pumped by the heart.
Another embodiment of the flow guiding piece is that the flow guiding piece is of an integral horn-shaped structure, and the large mouth side is covered on the periphery of the blood outflow opening towards the proximal end. The guide member of this structure is simple in structure and assembly, but because it is circumferentially arranged around the whole heart, it may slightly affect the flow of blood pumped by the heart itself, but does not block this flow.
As the outer tube 12 and the single-channel single-cavity cannula 20 are alternatively/switchably used, as an embodiment, as shown in fig. 8, a two-position three-way electromagnetic valve 40 is connected to the outlet tube 32 of the blood pump 30, the inlet of the two-position three-way electromagnetic valve 40 is connected to the outlet tube 32, the two outlets are respectively connected to the proximal end of the outer tube 12 and the proximal end of the single-channel single-cavity cannula 20, when the two-position three-way electromagnetic valve 40 is powered off, the outlet tube 32 of the blood pump 30 is communicated with the outer tube 12, and when the two-position three-way electromagnetic valve 40 is powered on, the outlet tube 32 of the blood pump 30 is communicated with the single-channel single-cavity cannula 20. The outer tube 12 and the single channel single lumen cannula 20 are rapidly and stably switched by powering on and off the two-position three-way solenoid valve 40. If the small-flow circulation auxiliary system is used for pumping blood of a human body for a period of time, and then insufficient blood supply or other emergency conditions are found, when large-flow blood supply is needed, the single-channel single-cavity cannula 20 can be inserted into the descending aorta through the femoral artery on the other side, and then the single-channel single-cavity cannula is switched to the large-flow circulation auxiliary system. The blood supply of the small flow circulation auxiliary system is not stopped during the whole interventional process of the single-channel single-cavity cannula 20, so that the blood supply of a human body is ensured.
When the small flow circulation auxiliary system is utilized to meet the blood flow requirement of a human body, the single-channel single-cavity cannula 20 can be not installed on the two-position three-way electromagnetic valve 40, the whole device is simple in structure, the single-channel single-cavity cannula 20 is inserted again when the large flow circulation auxiliary system is required to supply blood, and the single-channel single-cavity cannula 20 is installed on the two-position three-way electromagnetic valve 40 after the single-channel single-cavity cannula 20 is connected to a designated position. When the human body function is recovered, only the small flow circulation assistance is needed, the switching can be quickly performed. In order to further reduce the damage to blood, the valve cavity of the two-position three-way electromagnetic valve 40 can be switched by a flexible diaphragm, which can not only organize blood to pass through, but also avoid blood damage.
The blood pump 30 can be a centrifugal pump, a magnetic suspension pump, an electromagnetic drive pump, even a piston pump, a peristaltic pump and the like, and the blood pump 30 is positioned outside the body, so that the reliability of the whole auxiliary device is greatly improved, and vascular complications are reduced. If desired, the flow may be pulsed rather than continuous to mimic the natural action of the heart. The inner and outer surfaces of the single-pass dual-lumen cannula 10 and the single-pass single-lumen cannula 20 may be coated with an anticoagulant coating, such as heparin or a super-hydrophobic coating.
It should be noted that the above embodiments are only used to illustrate the technical solution of the present utility model, but not to limit the technical solution of the present utility model, and although the detailed description of the present utility model is given with reference to the above embodiments, it should be understood by those skilled in the art that the technical solution described in the above embodiments may be modified or some or all technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the present utility model, and all the modifications or substitutions are included in the scope of the claims and the specification of the present utility model.
Claims (9)
1. A catheter type ventricular assist system is characterized by comprising a single-channel double-cavity cannula (10) and a single-channel single-cavity cannula (20), wherein the single-channel double-cavity cannula (10) comprises an inner tube (11) and an outer tube (12), the proximal end of the inner tube (11) is communicated with an inlet tube (31) of a blood pump (30), an outlet tube (32) of the blood pump (30) is communicated with the proximal end of the outer tube (12) or the proximal end of the single-channel single-cavity cannula (20), blood is sucked from a blood inflow opening (a) at the distal end of the inner tube (11) and flows out from a blood outflow opening (b) at the distal end of the outer tube (12) to form a small-flow circulation assist system, and blood is sucked from the blood inflow opening (a) at the distal end of the inner tube (11) and flows out from a distal end opening of the single-channel single-cavity cannula (20) to form a large-flow circulation assist system.
2. The catheter-type ventricular assist system of claim 1 wherein the outer tube (12) is a flexible membrane, the distal end of the flexible membrane is welded and fixed to the outer wall of the inner tube (11), the proximal end is drawn away from the inner tube (11) to form a branching structure, and the boundary is sealed, the annular chamber between the inner tube (11) and the outer tube (12) forms a blood return chamber, and the blood outlet (b) is formed at the distal end of the flexible membrane.
3. The catheter-type ventricular assist system as claimed in claim 1, wherein the outer tube (12) is a hose, the proximal end of the outer tube (12) is drawn from the inner tube (11) to form a branching structure and the branching position is sealed, a nickel titanium wire mesh (121) is embedded in the distal end of the hose and is fixed with the inner tube (11), an annular chamber between the inner tube (11) and the outer tube (12) forms a blood return chamber, and the blood outflow port (b) is opened at the distal end position of the hose.
4. The catheter-based ventricular assist system of claim 1 wherein the inner tube (11) is made of different stiffness materials along its length, or wherein the inner tube (11) is made of the same material and a reinforcing stent (111) is embedded in the distal tube, said reinforcing stent (111) being a nickel-titanium alloy mesh or a nickel-titanium alloy spiral.
5. The catheter-based ventricular assist system of claim 1 wherein the cross-sectional area of the lumen of the single-channel single-lumen cannula (20) is greater than the effective cross-sectional area of the lumen between the inner tube (11) and the outer tube (12), the pump blood flow of the small-flow circulatory assist system is 1L/min, and the flow of the large-flow circulatory assist system is 3L/min.
6. The catheter-based ventricular assist system of claim 2 or 3 wherein a plurality of blood outflow openings (b) are circumferentially uniformly spaced apart, and a plurality of flow guiding members are provided at the blood outflow openings (b), the flow guiding members guiding the blood to flow downstream from the descending aorta.
7. The catheter-based ventricular assist system of claim 6 wherein said flow guide member is arranged outside said blood outflow port (b) in a sheet-like manner, and is shaped like a valve to be warped by the impact of blood.
8. The catheter-based ventricular assist system of claim 6 wherein said flow guide member has a monolithic horn-like structure and a large-mouth side is covered proximally around the blood outflow port (b).
9. The catheter-type ventricular assist system of claim 1, wherein the outlet tube (32) of the blood pump (30) is connected with a two-position three-way electromagnetic valve (40), an inlet of the two-position three-way electromagnetic valve (40) is connected with the outlet tube (32), two outlets are respectively connected with the proximal end of the outer tube (12) and the proximal end of the single-channel single-cavity cannula (20), when the two-position three-way electromagnetic valve (40) is powered off, the outlet tube (32) of the blood pump (30) is communicated with the outer tube (12), and when the two-position three-way electromagnetic valve (40) is powered on, the outlet tube (32) of the blood pump (30) is communicated with the single-channel single-cavity cannula (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420835057.2U CN222899996U (en) | 2024-04-22 | 2024-04-22 | Catheter type ventricular assist system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202420835057.2U CN222899996U (en) | 2024-04-22 | 2024-04-22 | Catheter type ventricular assist system |
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| CN222899996U true CN222899996U (en) | 2025-05-27 |
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| CN202420835057.2U Active CN222899996U (en) | 2024-04-22 | 2024-04-22 | Catheter type ventricular assist system |
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