CN219501146U - Fluid injection device and freezing sacculus - Google Patents

Abstract

The utility model provides a fluid injection device and a freezing saccule, wherein the fluid injection device comprises a connecting fluid channel, a connecting channel inlet and a connecting channel outlet are arranged, the connecting channel inlet is communicated with an external liquid supply device, and the connecting fluid channel is enclosed into a hollow tubular structure; the annular fluid channel is arranged at one end of the connecting fluid channel, the annular fluid channel is provided with a plurality of annular channel inlets and a plurality of nozzles, the plurality of annular channel inlets are connected with the plurality of connecting channel outlets in a one-to-one correspondence manner, the plurality of nozzles are arranged at intervals along the circumferential direction of the annular fluid channel, and the axis of the annular fluid channel is collinear with the axis of the tubular structure. The liquid enters from the inlet of the connecting fluid channel, is divided into a plurality of fluid streams through the connecting fluid channel and enters into the annular fluid channel through the inlets of the plurality of annular channels, and the annular fluid channel is of a circular ring structure, so that the fluid can symmetrically and uniformly flow under the action of the annular fluid channel, and the turbulence is reduced or avoided.

Description

Fluid injection device and freezing sacculus

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a fluid injection device and a freezing saccule.

Background

Atrial fibrillation (atrial fibrillation, AF) is one of the most common cardiac arrhythmias in the clinic. From the estimates, 3300 more than ten thousand people worldwide have AF. According to the Chinese data published in 2004, the AF prevalence rate of residents aged 30 to 85 years old in China is 0.77%, wherein the prevalence rate of people over 80 years old reaches over 30%. The incidence rate of AF increases with the age, and compared with non-atrial fibrillation patients of the same age, the atrial fibrillation patients often have poorer life quality and often have diseases such as hypertension, heart failure and the like, so the thromboembolic complications and the mortality rate of the patients are higher. Recent studies have linked the progression of AF with dementia. Therefore, the effective treatment of atrial fibrillation has important clinical significance. In long-term follow-up care, control of atrial fibrillation by intervention has been shown to improve quality of life.

For paroxysmal atrial fibrillation patients, the treatment is performed by adopting cryoballoon ablation, so that the method has higher safety: the tissue injury focus formed by cryoablation is more uniform, the boundary is clearer, eschar, vaporization burst and collagen denaturation contracture related to high temperature effect are not caused, the integrity of tissue cells is reserved to the greatest extent, and the risks of serious complications such as thrombosis, pulmonary vein stenosis, cardiac perforation, atrial esophageal fistula and the like can be reduced theoretically; the balloon catheter is adhered to the ablation tissue in the cryoablation process, so that the displacement of the catheter is small, and the ablation safety is improved; before cryogenic cryoablation, the cryogenic energy source can cause transient and reversible damage to the tissue, significantly reducing the risk of permanent damage to critical tissue.

Conventional ablation instrument adopts cascade refrigeration mode, N ₂ O is used as cryoablation low-temperature working medium, and the low-temperature working medium passes through a precise pipeline of the equipment, passes through a coaxial fluid connecting pipe and a catheter body and reaches a far-end saccule. N2O in low temperature state absorbs heat in the balloon by phase change evaporation effect to reach the temperature sufficient to cause myocardial infarctionThe cryoablation temperature of tissue necrosis achieves the purpose of cooling and ablation. The steam after heat exchange with the cardiac muscle returns to the interior of the cryoablation apparatus through the catheter tube body and the coaxial fluid connecting tube. The interior of the apparatus is kept in a vacuum environment using a vacuum pump and finally the steam is discharged to the exhaust system of the hospital.

The cryoablation balloon catheter is connected with the cryoablation instrument for cryoablation treatment of myocardial tissues, the spherical balloon is used for being attached to the left atrial pulmonary vein mouth, and the low-temperature working medium is sprayed to the surface of the balloon through a plurality of nozzles in the balloon and gasified and expanded for refrigeration. The refrigeration area forms a ring shape and basically coincides with the myocardial target treatment part, so that the cryoablation energy transmission is more concentrated, the refrigeration loss is lower, and the risk of freezing complications is reduced. The temperature sensor is arranged in the balloon, the treatment temperature is monitored in real time, the pressure sensor and the optical coupler sensor are arranged in the catheter handle, the integrity of the balloon is monitored in real time, low-temperature working medium is prevented from leaking into blood, and the head end of the catheter can be bent in a bidirectional manner and is attached to the treatment position of an intra-cardiac target.

The specific scheme in the prior art is as follows: the existing freezing saccule catheter generally comprises a main body tube with an elongated tubular structure, a matching instrument (such as a guide wire or a mapping catheter) is sleeved in a sliding manner in the inner cavity of the main body tube, an inner saccule and an outer saccule are sleeved outside the main body tube in sequence, a double-layer freezing saccule is formed by the distal end of the inner saccule and the distal end of the outer saccule, and the inner saccule and the outer saccule are tightly attached through vacuumizing. When the inner layer balloon is gradually filled with the refrigerant fluid (for example, laughing gas N ₂ O) the cryoballoon assumes an approximately ellipsoidal shape. The freezing saccule is internally provided with a temperature sensor fixedly connected with the main body pipe and used for measuring the temperature change in the freezing saccule.

The main body of the injection device is a hollow tube (generally nickel titanium or polyimide) with a closed blind end at the far end, the main body extends along the axis direction of the main body tube, the near end is a refrigerating fluid inlet, the far end is fixedly assembled with the main body tube in a spiral structure, and the outermost circumference of the spiral structure is provided with injection holes. When the freezing saccule needs to be inflated, the refrigerating fluid enters from the proximal end of the injection device to the distal end of the injection device, and is sprayed out from the spray hole to the hemisphere at the distal end of the freezing saccule, so that cryoablation is performed. In actual use, the first jet hole has the worst jet state and the smallest flow, and the second jet hole has the best jet state and the largest flow.

According to bernoulli's principle, the ideal fluid total pressure=dynamic pressure+static pressure+gravitational potential energy, and the fluid total pressure is unchanged everywhere in the pipeline. Constraint conditions: the fluid is incompressible; the sum of the sectional areas of all the spray holes is smaller than the sectional area of the hollow pipe body; the pressure of the refrigerant flowing into the hollow tube body is large enough; neglecting the flow resistance of the inner wall of the hollow tube body. Assuming that gravitational potential energy is zero and total pressure of all parts of the spiral part in the hollow pipe body is approximately equal, the refrigerating working medium in the hollow pipe body has the fastest flow speed, the largest dynamic pressure and the smallest static pressure at the first jet hole, and has the slowest flow speed, the smallest dynamic pressure and the largest static pressure at the second jet hole.

The factor determining the injection state/flow rate of the injection hole is the static pressure difference between the inside and outside of the injection hole. When the static pressure outside the injection hole is unchanged, the larger the static pressure inside the injection hole is, the better the injection state is, and the larger the flow is; and vice versa. Therefore, the refrigerant injection state of the first injection hole is the worst and the flow rate is the smallest, and the refrigerant injection state of the first injection hole is the best and the flow rate is the largest.

In view of this, in practical applications, in order to ensure that the cooling capacity in the circumferential direction of the distal end surface of the freezing balloon is substantially uniform, and to alleviate the negative effects caused by the above-described inconsistency in the injection state, the arrangement of the small holes 1 to N needs to be adjusted as follows (for example, 8 small holes): each hole is spaced 135 degrees in the circumferential direction of the spiral line, so that small holes are uniformly distributed in the axial projection direction of the main body pipe, and the spacing is 45 degrees. In addition, in the axial projection direction of the main body pipe, small holes with good spraying states and small Kong Jiaoti with poor spraying states are arranged so as to improve uneven spraying distribution of the refrigerant caused by flow difference.

The prior art arranges small holes with better spraying states and small Kong Jiaoti with poorer spraying states, but absolute uniformity of the spraying states still cannot be achieved. For example, the ejection state of the combination of the first orifice and the fourth orifice is necessarily inferior to the ejection state of the fifth orifice and the eighth orifice.

Taking 8 small holes as an example, when the small holes are arranged at 135 degree intervals (or, as long as the small hole intervals are 1, 3, 5, 7 and … … odd times of 45 degrees), the 8 small holes are located in different cross sections of the spiral line, and the larger the times, the more distant the cross section of the first small hole is located from the cross section of the eighth small hole is located. Alternatively, the 8 apertures cannot lie in the same plane perpendicular to the main tube.

After the refrigerant is sprayed from the small holes, the distances from the small holes to the surface of the balloon are obviously different because the spraying directions of the small holes are positioned at different cross sections of the spiral line. The refrigerant is gasified and expanded after being sprayed to the surface of the balloon, and is regarded as effective refrigeration. The refrigerant is gasified partially or completely without reaching the surface of the balloon, and is regarded as low-efficiency or ineffective refrigeration. The farther the orifice is from the balloon surface, the more likely it is to vaporize and expand before being ejected onto the balloon surface, resulting in inefficient or ineffective cooling. The worst-spraying holes are furthest from the balloon surface and the best-spraying holes are closest to the balloon surface, which further exacerbates the problem of uneven cooling of the distal surface of the balloon.

Disclosure of Invention

In view of the above, the present utility model provides a fluid injection device and a freezing balloon to reduce the influence of fluid turbulence generated when the refrigerant flows.

The embodiment of the specification provides the following technical scheme: a fluid ejection device, comprising: the connecting fluid channel is provided with a connecting channel inlet and a connecting channel outlet, the connecting channel inlet is communicated with an external liquid supply device, and the connecting fluid channel is enclosed into a hollow tubular structure; the annular fluid channel is arranged at one end of the connecting fluid channel, the annular fluid channel is provided with a plurality of annular channel inlets and a plurality of nozzles, the plurality of annular channel inlets are connected with the plurality of connecting channel outlets in a one-to-one correspondence manner, the plurality of nozzles are arranged at intervals along the circumferential direction of the annular fluid channel, and the axis of the annular fluid channel is collinear with the axis of the tubular structure.

Further, the number of the inlets of the annular channel is at least three, and the number of the nozzles is at least three.

Further, each annular channel inlet is disposed between two adjacent annular channel outlets.

Further, the sum of the sectional areas of the plurality of nozzles is smaller than the sectional area of the inlet of the connecting passage.

Further, the fluid ejection device further includes a cylinder, and the connecting fluid passage and the annular fluid passage are both provided on the cylinder.

Further, the cylinder body is provided with a circular ring radial section, and the connecting fluid channel and the annular fluid channel are both arranged in the pipe wall of the cylinder body; or the cylinder body is provided with a circular radial section, and the connecting fluid channel and the annular fluid channel are fixedly arranged outside the pipe wall of the cylinder body.

Further, the axis of each nozzle is located within a radial cross-section of the same annular fluid passage.

Further, the connecting fluid channels are axisymmetrically distributed relative to the axis of the cylinder; alternatively, the connecting fluid channels are distributed in mirror symmetry with respect to the axial cross section of the cylinder; alternatively, the connecting fluid passages are helically distributed with respect to the axis of the cylinder.

Further, the spouts are axisymmetrically distributed with respect to the axis of the cylinder or mirror symmetrically distributed with respect to the axial section of the cylinder.

The utility model also provides a freezing sacculus which comprises the fluid injection device.

Compared with the prior art, the beneficial effects that above-mentioned at least one technical scheme that this description embodiment adopted can reach include at least: the liquid enters from the inlet of the connecting fluid channel, is divided into a plurality of fluid streams through the connecting fluid channel and enters into the annular fluid channel through the inlets of the plurality of annular channels, and the annular fluid channel is of a circular structure, so that the fluid can symmetrically and uniformly flow under the action of the annular fluid channel, and the generation of turbulent flow is reduced or avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a pipeline distribution structure in a first embodiment of the present utility model;

FIG. 2 is a schematic view of a pipeline distribution first view structure according to a second embodiment of the present utility model;

FIG. 3 is a schematic view of a pipeline distribution second view structure according to a second embodiment of the present utility model;

fig. 4 is a schematic three-dimensional structure of a cylinder according to a second embodiment of the present utility model.

Reference numerals in the drawings: 10. connecting the fluid channels; 20. an annular fluid passage; 30. a cylinder body.

Detailed Description

Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 4, an embodiment of the present utility model provides a fluid ejection device including a connection fluid channel 10 and an annular fluid channel 20. The connecting fluid channel 10 is provided with a connecting channel inlet and a connecting channel outlet, the connecting channel inlet is communicated with an external liquid supply device, and the connecting fluid channel 10 is enclosed into a hollow tubular structure; the annular fluid channel 20 is arranged at one end of the connecting fluid channel 10, the annular fluid channel 20 is provided with a plurality of annular channel inlets and a plurality of nozzles, the plurality of annular channel inlets are connected with the plurality of connecting channel outlets in a one-to-one correspondence manner, the plurality of nozzles are arranged at intervals along the circumferential direction of the annular fluid channel 20, and the axis of the annular fluid channel 20 is collinear with the axis of the tubular structure surrounded by the connecting fluid channel 10.

The liquid enters from the inlet of the connecting fluid channel, is divided into a plurality of fluid streams through the connecting fluid channel 10 and enters into the annular fluid channel 20 through a plurality of annular channel inlets, and the annular fluid channel 20 has a circular structure, so that the fluid can symmetrically and uniformly flow under the action of the annular fluid channel 20, and the generation of turbulent flow is reduced or avoided.

It should be noted that, the connecting fluid channels 10 are axisymmetrically distributed with respect to the axis of the annular fluid channel 20; alternatively, the connecting fluid channels 10 are distributed in mirror symmetry with respect to the axial section of the annular fluid channel 20; alternatively, the connecting fluid channels 10 are helically distributed with respect to the axis of the annular fluid channel 20.

Each annular channel inlet is disposed between two adjacent annular channel outlets. The sum of the sectional areas of the plurality of spouts (all spouts) is smaller than the sectional area of the inlet of the connection passage.

The annular channel inlets are arranged between two adjacent annular channel outlets, so that fluid can uniformly flow towards nozzles at two sides when entering the annular fluid channel 20 from the annular channel inlets, and the problem of uneven injection caused by different distances between the annular channel inlets and the nozzles at two sides is avoided.

Meanwhile, the sum of the sectional areas of the plurality of nozzles (all nozzles) is smaller than the sectional area of the inlet of the connecting channel, so that the effect of avoiding the generation of fluid turbulence can be realized. When the refrigerant jet is non-uniform, the ablation energy received by the tissue (e.g., pulmonary vein ostia) in contact with the surface of the cryoballoon is also non-uniform. In this case, after the cryoballoon ablates the tissue (e.g., the pulmonary vein ostium), the result of the tissue ablation may be uneven, for example, when a portion of the tissue is ablated excessively, the tissue may still be ablated in place, and even a leak may be generated during the ablation. If the ablation is excessive, the esophagus, the phrenic nerve and even the brain may be damaged. And the electrical isolation effect of the tissue is poor if the ablation is not in place, so that the expected ablation purpose is not achieved. Thus, not only can the effectiveness of cryoablation be reduced, but also the recurrence rate after atrial fibrillation treatment can be increased. The utility model can effectively solve the problem of uneven injection of the refrigerating medium, thereby effectively improving the uniformity of cryoablation, improving the effectiveness of cryoablation and reducing the recurrence rate of treatment.

The number of the inlets of the annular channels is at least three, and the number of the nozzles is at least three. The number of the spouts is generally 8 to 16, preferably 8, 12 or 16 in this embodiment. The corresponding annular channel inlets may be chosen to be half the number of jets, i.e. 4-8, preferably 4, 6 or 8. The specific number is not limited to the utility model, and the utility model can be provided with different numbers of annular channel inlets and nozzles according to different working conditions.

The fluid ejection device further includes a cylinder 30, and the connection fluid passage 10 and the annular fluid passage 20 are both provided on the cylinder 30.

In one embodiment, the cylinder 30 has a circular radial cross section, and the connecting fluid channel 10 and the annular fluid channel 20 are buried inside the wall of the cylinder 30. The cylinder 30 has a sleeve-shaped structure with two open ends, the connecting fluid channel 10 and the annular fluid channel 20 are positioned between the inner wall and the outer wall of the cylinder 30, and the nozzle is connected with the outer side.

In another embodiment, the cylinder 30 has a circular radial cross section, and the connecting fluid channel 10 and the annular fluid channel 20 are fixedly arranged outside the pipe wall of the cylinder 30; that is, the connecting fluid channel 10 and the annular fluid channel 20 are solid pipelines, fixedly arranged along the periphery of the cylinder 30, and the nozzles are arranged on the outer side surface of the fluid channel.

Preferably, the jets are axisymmetrically distributed with respect to the axis of the barrel 30 or mirror symmetrically distributed with respect to the axial cross-section of the barrel 30. Each jet comprises at least one radial jet orifice or at least one radial jet slit.

The nozzle can be arranged to uniformly spray the refrigerant in the annular fluid channel 20 to a set position, and the number and the structure of the nozzle can be selected according to different requirements.

In particular, in the present embodiment, the axis of each nozzle is located within the radial cross-section of the same annular fluid passage 20. And the annular channel inlet axis is parallel to the axis of the annular fluid channel 20, each spout axis being parallel to the radial direction of the annular fluid channel 20.

In other embodiments of the utility model, the annular channel inlet axis is at an angle to the axis of the annular fluid channel 20, and the orifice axis is also at an angle to the annular channel inlet axis, and the angle is greater than or equal to 90 ° and less than or equal to 180 °.

When the included angle is 90 degrees, the injection requirement of the balloon can reach an optimal value due to the perpendicular structure of the inlet axis of the annular channel and the axis of the annular fluid channel 20. When the included angle is 180 deg., the turbulence generated in the annular fluid channel 20 is at a minimum because the inlet axis of the annular channel is parallel to the axis of the annular fluid channel 20.

The connecting fluid channels 10 are distributed axisymmetrically with respect to the axis of the cylinder 30; alternatively, the connecting fluid channels 10 are distributed in mirror symmetry with respect to the axial section of the cylinder 30; alternatively, the connecting fluid passages 10 are spirally distributed with respect to the axis of the cylinder 30.

Specifically, the connecting fluid channel 10 comprises at least one first branching unit; when the connecting fluid channel 10 comprises a first branching unit, the first branching unit is mirror symmetrical with respect to the axial section of the cylinder 30; alternatively, when the connecting fluid channel 10 comprises at least two first branching units, each first branching unit is rotationally symmetrical with respect to the axis of the cylinder 30. The first branching unit is provided with a first main path and a first branch path, an inlet of the first branch path is arranged in the middle of the first branch path, outlets of the first branch paths are arranged at two end parts of the first branch path, the outlets of the two first branch paths are distributed in a central symmetry or axisymmetry mode relative to the first main path, the outlets of the first main path are connected with the inlet of the first branch path, and the extending direction of the first main path is parallel to the axis of the cylinder 30; the nozzle comprises two radial jet holes, the sectional area of each radial jet hole is smaller than or equal to the sectional area of the first branch, and the sectional area of the first main path is larger than or equal to 2 times of the sectional area of the first branch. In a preferred embodiment, the cross-sectional area of the radial injection hole is approximately equal to the cross-sectional area of the first branch, and the cross-sectional area of the first main passage is greater than or equal to 2 times the cross-sectional area of the first branch.

It should be noted that, in the embodiment of the present utility model, the extending direction of the first main path is parallel to the axial direction of the cylinder 30, that is, the overall shape of the first branch unit may be a T shape or a Y shape (axisymmetric pattern). Or the shape of the first branch may be S-shaped, with the outlet of the first main branch being connected at the center of the S-shape (center symmetrical pattern).

The utility model also has the following embodiments that the number of the first branch circuits can be two, the two first branch circuits form an X-shaped structure, the first main circuit is a straight pipeline, and the outlet of the first main circuit is connected with the center position of the X-shaped structure. Or the number of the first branch circuits can be two, the two ends of the first main circuit are outlets, the middle part of the first main circuit is an inlet, and the outlets at the two ends of the first main circuit are correspondingly connected with one first branch circuit, namely, the whole shape of the first branch unit is I-shaped.

Of course, in different embodiments, the first main path may be a curved path, and the above embodiments may be combined with each other.

The fluid channel in the embodiment of the utility model comprises a second branch unit, the second branch unit comprises a second main path and a second branch path, the inlet of the second branch path is arranged in the middle of the second branch path, the outlets of the second branch path are arranged at two end parts of the second branch path, the outlets of the two second branch paths are in central symmetry or axisymmetric distribution relative to the second main path, the outlets of the second main path are connected with the inlets of the second branch path, the extending direction of the second main path is parallel to the axis of the cylinder 30, and the outlets of the two second branch paths are connected with the two first branch units in a one-to-one correspondence manner.

The cross-sectional area of the second branch is greater than or equal to the cross-sectional area of the first main path, and the cross-sectional area of the second main path is greater than or equal to 2 times the cross-sectional area of the second branch. In a preferred embodiment, the cross-sectional area of the second leg is approximately equal to the cross-sectional area of the first main leg, the cross-sectional area of the second main leg being greater than or equal to 2 times the cross-sectional area of the second leg.

The structures of the second main path and the second branch path may be the structures of the first branching unit in the above embodiments, for example, T-shape, Y-shape, or the like. The line diameter in the second branching unit should be greater than or equal to the line diameter of the first branching unit, so that it can be ensured that the flow rate of the fluid and the injection pressure of the radial injection holes in the following branching unit can reach the set values.

In another embodiment of the present utility model, the outlet of each second branch is correspondingly connected to the first fluid inlets of the two first branch units, and the two first branch units connected to the outlet of the same second branch are axisymmetrically distributed with respect to the corresponding second branch.

In this embodiment, at least two second branch units are uniformly distributed along the circumferential direction of the cylinder 30 at intervals, and the flow velocity and the flow rate of the fluid inlet of each second branch unit are the same, so that the inlet flow velocity and the flow rate of each second branch unit are the same.

More preferably, the fluid injection device further includes a third branching unit, the third branching unit includes a third main path and a third branch path, an inlet of the third branch path is disposed in a middle portion of the third branch path, outlets of the third branch path are disposed at two ends of the third branch path, outlets of the two third branch paths are distributed in a central symmetry or axisymmetric manner with respect to the third main path, an outlet of the third main path is connected with an inlet of the third branch path, an extending direction of the third main path is parallel to an axis of the cylinder 30, and outlets of the two third branch paths are connected with second fluid inlets of the two second branching units in a one-to-one correspondence.

At least two third branch units are uniformly distributed along the circumferential direction of the cylinder 30 at intervals. The cross-sectional area of the third branch is greater than or equal to the cross-sectional area of the second main path, and the cross-sectional area of the third main path is greater than or equal to 2 times the cross-sectional area of the third branch. In a preferred embodiment, the cross-sectional area of the third leg is approximately equal to the cross-sectional area of the second main leg, the cross-sectional area of the third main leg being greater than or equal to 2 times the cross-sectional area of the third leg.

It should be noted that the first branch, the second branch and the third branch may be straight lines or curved lines.

For example, in the embodiment of the present utility model, the first branch and the second branch are straight lines, the third branch is a curved line, the third branch includes two straight lines segments and a connecting segment, which are arranged in parallel and at intervals, and two ends of the connecting segment are connected to the same end of the two straight lines segments. The third branch is arranged to achieve the above-mentioned structural purpose to reduce the dynamic pressure and static pressure effects of the third branch on the refrigerant, so as to achieve the preset purpose.

The first branch, the second branch and the third branch may adopt the same structure or adopt different structure combinations, which can meet the same restriction of flow resistance in the above embodiment.

In the embodiment of the present utility model, which is not illustrated in the drawings, the first branch, the second branch and the third branch may be regarded as a tree-shaped branching unit, and different numbers of tree-shaped branching units may be selectively set according to the number of different nozzles, which will not be described in detail herein.

It should be noted that, in the embodiment of the present utility model, the cylinder 30 may be integrally formed by using a 3D printing technology, and of course, a split structure may also be used. The barrel 30 of the split structure comprises an inner barrel and an outer barrel, and the outer wall of the inner barrel is provided with the first branch unit, the second branch unit and the third branch unit which are in groove shapes. The distribution manner is the same as that of the above embodiment, and a detailed description thereof is omitted here. The near-end section and the far-end face of the inner cylinder and the outer cylinder are welded or bonded, and corresponding positioning grooves are arranged for positioning.

The embodiment of the utility model also provides a freezing sacculus which comprises the fluid injection device. The cryoballoon catheter includes a main tube and a fluid tube, wherein the main tube is inserted into the inner hole of the cylinder 30 or the hollow part of the cylindrical structure.

The fluid injection device in this embodiment may be sleeved outside the main body pipe, and the fluid injection device and the main body pipe may be connected by welding, bonding or other fixing connection, or may be provided in a form that the fluid injection device is capable of sliding relative to the main body pipe.

Or a limiting part is arranged on the main body pipe, and the limiting part can be clamped and limited when the fluid injection device is arranged on the main body pipe in a penetrating way, so that the axial displacement of the fluid injection device is limited.

The fluid pipes are used for providing the refrigerating working medium for the fluid injection device, the number of the fluid pipes in the embodiment of the utility model is at least one, the fluid pipes can be selected to be a plurality of according to different requirements, and the flow rate of each fluid pipe is the same.

The 8-hole pressure distribution in the prior art is not uniform, the 8-hole pressure distribution in the utility model is much more uniform than that in the prior art, and compared with the prior art, the utility model has the following beneficial effects from the pressure distribution level: the utility model can avoid the problems of uneven tissue cryoablation effect, even ablation leakage point, poor tissue potential isolation effect, and high recurrence rate of posterior atrial fibrillation treatment caused by uneven pressure distribution, thereby reducing the effectiveness of cryoablation.

The foregoing description of the embodiments of the utility model is not intended to limit the scope of the utility model, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the utility model shall fall within the scope of the patent. In addition, the technical characteristics and technical scheme, technical characteristics and technical scheme can be freely combined for use.

Claims (10)

1. A fluid ejection device, comprising:

the connecting fluid channel (10) is provided with a connecting channel inlet and a connecting channel outlet, the connecting channel inlet is communicated with an external liquid supply device, and the connecting fluid channel (10) is enclosed into a hollow tubular structure;

the annular fluid channel (20) is arranged at one end of the connecting fluid channel (10), the annular fluid channel (20) is provided with a plurality of annular channel inlets and a plurality of nozzles, the annular channel inlets are connected with the connecting channel outlets in a one-to-one correspondence mode, the nozzles are arranged at intervals along the circumferential direction of the annular fluid channel (20), and the axis of the annular fluid channel (20) is collinear with the axis of the tubular structure.

2. The fluid ejection device of claim 1, wherein the annular channel inlets are at least three and the nozzles are at least three.

3. The fluid ejection device of claim 1, wherein each of the annular channel inlets is disposed between two adjacent annular channel outlets.

4. The fluid ejection device of claim 1, wherein a sum of cross-sectional areas of the plurality of nozzles is smaller than a cross-sectional area of the connection channel inlet.

5. The fluid ejection device of claim 1, further comprising a barrel (30), wherein the connecting fluid channel (10) and the annular fluid channel (20) are both disposed on the barrel (30).

6. The fluid ejection device of claim 5, wherein the barrel (30) has a circular radial cross section, and the connecting fluid channel (10) and the annular fluid channel (20) are both disposed inside a wall of the barrel (30); or the cylinder body (30) is provided with a circular radial section, and the connecting fluid channel (10) and the annular fluid channel (20) are fixedly arranged outside the pipe wall of the cylinder body (30).

7. A fluid ejection device according to claim 5, wherein the axis of each nozzle is located within a radial cross-section of the same annular fluid channel (20).

8. The fluid ejection device of claim 5, wherein the connecting fluid channels (10) are axisymmetrically distributed with respect to the axis of the cylinder (30); alternatively, the connecting fluid channels (10) are distributed in mirror symmetry with respect to the axial section of the cylinder (30); alternatively, the connecting fluid passages (10) are spirally distributed with respect to the axis of the cylinder (30).

9. The fluid ejection device of claim 5, wherein the nozzles are axisymmetrically distributed with respect to the axis of the barrel (30) or mirror symmetrically distributed with respect to the axial cross-section of the barrel (30).

10. A cryoballoon comprising a fluid-ejection device, wherein the fluid-ejection device is the fluid-ejection device of any one of claims 1-9.