CN215608125U

CN215608125U - Venous cannula with sacculus

Info

Publication number: CN215608125U
Application number: CN202120530620.1U
Authority: CN
Inventors: 胡锡祥; 廖小卒
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-01-25
Anticipated expiration: 2031-03-15

Abstract

The utility model discloses a venous cannula with a balloon, which comprises a cannula (1), the balloon (2), a conduit (3) and a one-way valve (4), wherein a cavity (11) is arranged in the cannula (1), the balloon (2) is arranged outside the rear part of a front end plug (12) of the cannula (1), and the balloon (2) is connected with the one-way valve (4) through the conduit (3), and the venous cannula is characterized in that: the tube wall of the intubation tube (1) behind the saccule (2) is provided with a plurality of side holes (13), and the side holes (13) are communicated with the cavity (11). After the saccule blocks the inferior vena cava, the blood flow in the inferior vena cava can be fully recovered; meanwhile, the saccule exists, the venous cannula is in a suspended state in the inferior vena cava, and the telecentric section of the inferior vena cava is raised, so that the venous cannula is prevented from adhering to the wall, and the side hole is blocked to influence the recovery of blood flow; the saccule blocks the inferior vena cava, effectively avoids the recirculation problem of VV-ECMO, and improves the oxygenation efficiency.

Description

Venous cannula with sacculus

Technical Field

The utility model relates to a venous cannula with a balloon, which can be used for extracorporeal circulation or extracorporeal membrane pulmonary oxygenation ECMO.

Background

The Extracorporeal Membrane Oxygenation (ECMO) is mainly used for providing continuous Extracorporeal respiration and circulation for patients with severe cardiopulmonary failure to maintain the life of the patients, and the core part of the Extracorporeal Membrane Oxygenation (ECMO) is a Membrane lung (artificial lung) and a blood pump (artificial heart), so that long-time cardiopulmonary support can be performed on the patients with severe cardiopulmonary failure, and valuable time is won for critical rescue. The ECMO mainly comprises an intravascular cannula, a connecting pipe, a power pump (artificial heart), an oxygenator (artificial lung), an oxygen supply pipe, a monitoring system and the like. There are 2 types of ECMO, including:

one is VV-ECMO (vein-vein), i.e., draining hypoxic blood from large veins, oxidizing and decarbonating in an extracorporeal device, back to the right atrium. Oxygenated blood enters the pulmonary circulation and the whole body to supply oxygen to the organism and make the lungs rest. VV-ECMO (vein-vein) generally uses the femoral vein and the internal jugular vein as vascular access, the former for drainage and the latter for reflux. Recirculation is inevitable during ECMO treatment, and in order to improve the efficiency of the treatment we can control recirculation within an acceptable range by the position of the catheter tip and the blood flow volume of the treatment, there are also single needle double lumen ECMO venous catheters, and the right internal jugular vein is recommended.

II, secondly: VA-ECMO (vein-artery) drains hypoxic blood from large veins, oxidizes and decarbonizes in an extracorporeal device, and returns to the aorta. Thus, oxygenated blood enters the systemic circulation and the whole body to supply oxygen to the organism, improve the hemodynamics and enable the heart and lungs to rest. VA ECMO requires the establishment of two blood pathways, typically venous drainage pathways with the preferred placement of the right jugular vein and the left and right femoral vein with the tip at the entrance to the right atrium from the superior or inferior vena cava. The establishment of the arterial catheter of the blood return passage suggests the selection of femoral artery, which is convenient for catheterization and nursing. After the catheter is placed, the position of the tip of the catheter is determined by ultrasound and radiography, and the position of the tip of the catheter is adjusted as required after the treatment is established. Judging the watershed according to the clinical treatment, reasonably adjusting the position of the catheter, and establishing a perfusion catheter

The current venous cannula for extracorporeal circulation or extracorporeal membrane oxygenation ECMO is a common structure, and the structure is shown in the patent as follows: 03219019.0, patent name: a novel medical venous cannula and a utility model patent with the publication number of "CN 2624935Y", as shown in fig. 1, comprising a tube head 1A, a tube body 2A and a tube tail 3A, wherein the tube head 1A is provided with a plurality of side holes 4A, the tube body 2A behind the tube head 1A is provided with a balloon 5A, the balloon 5A is connected with a catheter 6A, and the catheter 6A is connected with a one-way valve 7A positioned at the tube tail 3A; the working principle diagram is shown in fig. 2, the saccule 5A divides the inferior vena cava (femoral vein) into two sections, and the blood flow of one femoral vein of the proximal section flows in from the tube head 1A and is led out by the cannula after being provided with a plurality of side holes 4A.

In vitro membrane pulmonary oxygenation ECMO uses venous cannulation of conventional construction, there are several factors that affect the effect clinically: as recirculation is a factor that severely affects oxygen balance during VV-ECMO, the presence of recirculation causes oxygenated blood to flow away through the drain and not into the patient. In the VA-ECMO process, because the blood volume is insufficient, the inferior vena cava is collapsed, the venous cannula is easy to adhere to the wall, and the sufficient venous blood cannot be recovered, so that the flow is insufficient. These problems still plague this health care provider clinically.

Disclosure of Invention

The utility model mainly aims to provide a venous cannula with a balloon, and solves the technical problems that in the prior art, the venous cannula of an extracorporeal membrane pulmonary oxygenation ECMO has the problem of recirculation in an operation, oxygenation and inferior vena cava collapse are seriously influenced, the venous cannula is easy to adhere to the wall, and sufficient venous blood cannot be recovered, so that the flow is insufficient.

The technical scheme of the utility model is realized as follows:

take venous cannula of sacculus, including intubate, sacculus, pipe and check valve, the intubate inside is provided with the cavity, and the sacculus is installed to the rear outside of the front end plug of intubate, and the sacculus passes through the pipe to be connected with the check valve, its characterized in that: the cannula wall behind the saccule is provided with a plurality of side holes which are communicated with the cavity.

The front end plug is a cone.

The section of the intubation is circular, and the side hole is a round hole.

The side holes are circumferentially spaced into a plurality of rows, each row including a plurality of side holes.

And a section of insertion tube positioned behind the saccule is provided with a supporting metal wire.

Compared with the prior art, the utility model has the following advantages:

1. the saccule of the device is positioned at the front end of the intubation tube and in front of the drainage side hole, and can fully recover the blood flow in the inferior vena cava after the saccule blocks the inferior vena cava;

2. the tip of the venous cannula is tapered, the aperture of the tip is smaller, and the backflow amount of the proximal end is reduced.

3. Due to the existence of the saccule, the venous cannula is in a suspended state in the inferior vena cava, the drainage side hole is positioned in the center of the inferior vena cava, and the distal section of the inferior vena cava is raised after the saccule blocks, so that the situation that the venous cannula blocks the side hole due to adherence of the venous cannula is prevented, and the recovery of blood flow is influenced.

4. After the saccule blocks the lower vena cava, the recycling problem of VV-ECMO can be effectively avoided, and the oxygenation efficiency is improved.

5. Because the size of the saccule is controllable, the saccule can be pumped out after the condition is stable, and the blocking state of the inferior vena cava is relieved. The balloon can be partially filled, the effect of partially blocking the inferior vena cava is achieved, the flow is increased, the recirculation is reduced, meanwhile, the vein reflux of important organs is not influenced, the actual operation is simple and convenient, and the using effect is good.

Drawings

FIG. 1 is a schematic diagram of a prior art venous cannula for extracorporeal membrane pulmonary oxygenation;

FIG. 2 is a diagram of the operation of a prior art venous cannula for extracorporeal membrane oxygenation;

FIG. 3 is a perspective view of the structure of the present invention;

FIG. 4 is a front view of the present invention;

FIG. 5 is a sectional view A-A of FIG. 4;

fig. 6 is a state diagram of the use of the present invention.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and the detailed description below:

as shown in fig. 3 to 5, the present embodiment provides a venous cannula with a balloon, which includes a cannula 1, a balloon 2, a conduit 3 and a one-way valve 4, a cavity 11 is provided inside the cannula 1, the balloon 2 is installed outside the rear of a front end plug 12 of the cannula 1, the balloon 2 is connected with the one-way valve 4 through the conduit 3, and the venous cannula is characterized in that: the tube wall of the cannula 1 behind the saccule 2 is provided with a plurality of side holes 13, and the side holes 13 are communicated with the cavity 11.

The front end plug 12 is a cone to facilitate piercing of the vessel wall. The tip of the front end plug 12 is provided with a tip hole 15, the aperture of the tip hole 15 is small, the center of the tip hole 15 needs to pass through a guide wire, and a supporting inner core also needs to be placed, so the blood heat reflux quantity of the proximal section can be ignored.

The section of the cannula 1 is circular, the side hole 13 is a round hole, the structure is simple, and the manufacture is easy.

The side holes 13 are circumferentially spaced into a plurality of rows, each row includes a plurality of side holes 13, the rows are 4 rows in the figure, the side holes are circumferentially spaced at 90 degrees, and each row of 4 side holes 13 can uniformly enable blood to flow back to the cavity 11 in the cannula 1.

The section of the insertion tube 1 positioned behind the balloon 2 is provided with the supporting metal wire 14, so that the cavity 11 in the insertion tube 1 is fully opened, and the unsmooth blood flow caused by deformation during bending is avoided.

As shown in fig. 6, the working principle of the venous cannula with the balloon provided by the embodiment in use is as follows: the saccule 2 divides the femoral vein (inferior vena cava) into two sections, namely a proximal section 16A and a distal section 16B, the femoral vein of the proximal section 16A is blocked, the femoral vein pipeline is in a suspended state, and the distal section 16B of the femoral vein (inferior vena cava) rises to prevent the vein cannula from adhering to the wall and block the side hole to influence the recovery of blood flow. After the saccule 2 blocks the femoral vein (inferior vena cava) of the proximal segment, the blood flow in the femoral vein (inferior vena cava) of the distal segment 16B can be fully recovered, the recirculation problem of VV-ECMO is effectively avoided, and the blood oxygenation efficiency is improved; because the size of the sacculus 2 is controllable, the sacculus 2 can be evacuated after the condition is stable, and the blocking state of femoral vein (inferior vena cava) can be relieved. The balloon 2 can be partially filled to play a role in partially blocking femoral vein (inferior vena cava), so that the flow is increased, the recirculation is reduced, and the venous return of important organs is not influenced.

The above embodiments are only preferred embodiments of the present invention, but the present invention is not limited thereto, and any other changes, modifications, substitutions, combinations, simplifications, which are made without departing from the spirit and principle of the present invention, are all equivalent replacements within the protection scope of the present invention.

Claims

1. Take venous cannula of sacculus, including intubate (1), sacculus (2), pipe (3) and check valve (4), intubate (1) the inside is provided with cavity (11), rear outside installation sacculus (2) of front end plug (12) of intubate (1), and sacculus (2) are connected its characterized in that through pipe (3) and check valve (4): the tube wall of the intubation tube (1) behind the saccule (2) is provided with a plurality of side holes (13), and the side holes (13) are communicated with the cavity (11).

2. The valved venous cannula of claim 1, wherein: the front end plug (12) is a cone.

3. A valved venous cannula according to claim 1 or 2, wherein: the section of the cannula (1) is circular, and the side hole (13) is a round hole.

4. The venous cannula with balloon of claim 3, wherein: the side holes (13) are circumferentially spaced into a plurality of rows, each row containing a plurality of side holes (13).

5. The venous cannula with balloon of claim 4, wherein: a section of the insertion pipe (1) positioned at the rear part of the saccule (2) is provided with a supporting metal wire (14).