CN115919445A - Fluid injection device and freezing balloon - Google Patents

Abstract

The invention 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 on the connecting fluid channel, 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 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, 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 strands of fluid through the connecting fluid channel and enters the annular fluid channel through the plurality of annular channel inlets.

Description

Fluid injection device and freezing balloon

Technical Field

The invention relates to the technical field of medical instruments, in particular to a fluid injection device and a freezing balloon.

Background

Atrial Fibrillation (AF) is one of the most common clinical arrhythmias. According to estimates, there are 3300 more than ten thousand people worldwide who have AF. According to the published Chinese data in 2004, the prevalence rate of AF of residents in China between 30 and 85 years old is 0.77%, wherein the prevalence rate of people over 80 years old is over 30%. The incidence of AF increases with age, and compared with non-atrial fibrillation patients of the same age, the atrial fibrillation patients are often poorer in quality of life and often accompanied by diseases such as hypertension, heart failure and the like, so that thromboembolic complications and mortality of the patients are higher. Recent studies have linked AF to the development of 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 freezing balloon ablation is adopted for treatment, and the safety is higher: the tissue damage focus formed by the cryoablation is more uniform, the boundary is clearer, eschar, vaporization burst and collagen degeneration contracture related to high temperature effect are not caused, the integrity of tissue cells is kept to the maximum extent, and the risk of serious complications such as thrombosis, pulmonary vein stenosis, heart perforation, atrioesophageal fistula and the like can be reduced theoretically; the balloon catheter is adhered to the ablation tissue in the cryoablation process, the catheter is small in displacement, 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 vital tissues.

The conventional ablation instrument adopts a cascade refrigeration mode, N ₂ And the low-temperature working medium passes through the precise pipeline of the device, passes through the coaxial fluid connecting pipe and the catheter body and reaches the far-end balloon. The N2O in the low-temperature state absorbs heat in the balloon through the phase change evaporation effect, so that the cryoablation temperature enough to cause myocardial tissue necrosis is achieved, and the purpose of cryoablation is achieved. The steam after heat exchange with the cardiac muscle returns to the interior of the cryoablation instrument through the catheter body and the coaxial fluid connecting pipe. The interior of the apparatus is maintained in a vacuum environment using a vacuum pump and the vapor is ultimately discharged to the exhaust system of the hospital.

The cryoablation balloon catheter is connected with a cryoablation instrument for cryoablation treatment of cardiac muscle tissue, the spherical balloon is used for being attached to the left atrium pulmonary vein opening, and low-temperature working medium is sprayed to the surface of the balloon through a plurality of nozzles inside the balloon, gasified and expanded for refrigeration. The refrigeration area forms a ring shape and is basically overlapped with the target treatment part of the cardiac muscle, so that the cryoablation energy transfer is more concentrated, the refrigeration loss is lower, and the risk of cryocomplications is reduced. The built-in temperature sensor of sacculus, real-time supervision treatment temperature, built-in pressure sensor of pipe handle and opto-coupler sensor, real-time supervision sacculus integrality avoids low temperature working medium to leak and gets into blood, and the pipe head end can the both-way bending, pastes and pastes the intracardiac target treatment position.

The specific scheme of the prior art is as follows: the existing freezing balloon catheter generally comprises a main body tube of a slender tubular structure, a matching instrument (such as a guide wire or a mapping catheter) is sleeved in an inner cavity of the main body tube in a sliding mode, an inner balloon and an outer balloon are sequentially sleeved outside the main body tube, a double-layer freezing balloon is formed by the far end of the inner balloon and the far end of the outer balloon, and the inner balloon and the outer balloon are tightly attached through vacuumizing. When the inner balloon is gradually filled with refrigerant fluid (e.g. liquid laughing gas N) ₂ O), the cryoballoon appears to approximate an ellipsoid. A temperature sensor fixedly connected with the main tube is arranged in the freezing saccule and used for measuring the temperature change in the freezing saccule.

The main body of the injection device is a hollow tube body (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 tube, the near end of the main body is a refrigerating working medium fluid inlet, the far end of the main body is in a spiral structure and is fixedly assembled with the main tube, and the outermost circumferential surface of the spiral structure is provided with injection holes. When the freezing saccule needs to be inflated, the refrigerating working medium fluid enters from the near end of the injection device and flows to the far end of the injection device, and is sprayed out from the spray hole to the hemisphere at the far end of the freezing saccule for cryoablation. In practical use, the first jet hole has the worst refrigerating working medium jet state and the minimum flow, and the second jet hole has the best refrigerating working medium jet state and the maximum flow.

According to the Bernoulli principle, the ideal total fluid pressure = dynamic pressure + static pressure + gravitational potential energy, and the total fluid pressure in each position in the pipeline is unchanged. Constraint conditions are as follows: the fluid is incompressible; the sum of the sectional areas of all the injection holes is smaller than the sectional area of the hollow pipe body; the pressure of the refrigerant flowing into the hollow pipe body is enough; neglecting the flow resistance of the inner wall of the hollow tube body. And when the total pressure at each part 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 velocity, the largest dynamic pressure and the smallest static pressure at the first injection hole, and has the slowest flow velocity, the smallest dynamic pressure and the largest static pressure at the second injection 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 jet hole is unchanged, the larger the static pressure inside the jet hole is, the better the jet state is, and the larger the flow rate is; and vice versa. Therefore, the injection state of the refrigerant of the first injection hole is the worst and the flow rate is the minimum, and the injection state of the refrigerant of the first injection hole is the best and the flow rate is the maximum.

In view of this, in practical applications, in order to ensure that the cooling capacity of the distal end surface of the cryoballoon is substantially uniform in the circumferential direction and to reduce the negative effects caused by the inconsistency of the above-mentioned injection states, the arrangement of the small holes 1-N needs to be adjusted as follows (taking 8 small holes as an example): each hole is at an interval of 135 degrees in the circumferential direction of the spiral line, so that the small holes are uniformly distributed at an interval of 45 degrees in the axial projection direction of the main body pipe. In addition, in the axial projection direction of the main body pipe, the small holes with good injection states and the small holes with poor injection states are alternately arranged, so that the uneven injection distribution of the refrigeration working medium caused by flow difference is improved.

In the prior art, small holes with good spraying states and small holes with poor spraying states are alternately arranged, but absolute uniformity of the spraying states cannot be achieved. For example, the ejection state of the combination of the first orifice and the fourth orifice is inevitably 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 a 135-degree interval (or, if the small hole interval is 1, 3, 5, 7 \8230; odd times of 45 degrees), the 8 small holes are positioned in different cross sections of the spiral line, and the larger the multiple is, the farther the distance between the cross section of the first small hole and the cross section of the eighth small hole is. Alternatively, the 8 holes cannot fall in the same plane perpendicular to the main body tube.

After the refrigeration working medium is sprayed out from the small hole, the distance from the small hole to the surface of the saccule has obvious difference because the spraying direction of the small hole is positioned on different cross sections of the spiral line. The refrigerant is gasified and expanded after being sprayed to the surface of the balloon, and the effective refrigeration is realized. The refrigerant does not reach the surface of the balloon and is partially or fully vaporized, which is considered to be inefficient or ineffective refrigeration. The further the aperture is from the balloon surface, the more likely it will vaporize and expand before being ejected onto the balloon surface, resulting in inefficient or ineffective cooling. The worst-case orifice is furthest from the balloon surface and the best-case orifice is closest to the balloon surface, further exacerbating the problem of uneven cooling of the balloon distal surface.

Disclosure of Invention

In view of the above, the present invention provides a fluid injection device and a freezing balloon, so as to reduce the influence of fluid turbulence generated when a 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 surrounded 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 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, and the axis of the annular fluid channel is collinear with the axis of the tubular structure.

Further, the annular channel has at least three inlets and at least three nozzles.

Further, each annular channel inlet is arranged 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 injection device further comprises a cylinder, and the connecting fluid channel and the annular fluid channel are arranged on the cylinder.

Furthermore, the cylinder body is provided with a circular ring radial section, and the connecting fluid channel and the annular fluid channel are arranged inside 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 spout lies within a radial cross-section of the same annular fluid passage.

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

Further, the nozzles are distributed in axial symmetry relative to the axis of the cylinder or in mirror symmetry relative to the axial section of the cylinder.

The invention also provides a freezing balloon which comprises the fluid injection device.

Compared with the prior art, the embodiment of the specification adopts at least one technical scheme which can achieve the beneficial effects that at least: the liquid enters from the connecting fluid channel inlet, is divided into a plurality of strands of fluid through the connecting fluid channel and enters the annular fluid channel through the annular channel inlets.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic diagram of the structure of the piping arrangement in the first embodiment of the present invention;

FIG. 2 is a schematic view of a second embodiment of a first view of a pipeline distribution;

FIG. 3 is a schematic diagram of a second perspective view of the distribution of the pipeline in a second embodiment of the present invention;

FIG. 4 is a schematic three-dimensional structure of a cylinder according to a second embodiment of the present invention;

FIG. 5 is a simulation graph of an 8-hole pressure distribution for a prior art structure;

fig. 6 is a simulation diagram of the pressure distribution of 8 holes according to an embodiment of the present invention.

Reference numbers in the figures: 10. connecting the fluid channels; 20. an annular fluid passage; 30. and (4) a cylinder body.

Detailed Description

The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

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

As shown in fig. 1 to 4, an embodiment of the present invention provides a fluid ejection device including a connecting 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 a tubular structure enclosed by the connecting fluid channel 10.

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

It should be noted that the connecting fluid channels 10 are axially symmetrically distributed with respect to the axis of the annular fluid channel 20; alternatively, the connecting fluid channel 10 is arranged in mirror symmetry with respect to the axial cross-section of the annular fluid channel 20; alternatively, the connecting fluid channel 10 is 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 cross-sectional areas of the plurality of jets (all jets) is less than the cross-sectional area of the inlet of the connecting channel.

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

Meanwhile, the sum of the sectional areas of a 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 injection is not uniform, the tissue in contact with the cryoballoon surface (e.g., the pulmonary vein ostia) receives non-uniform ablation energy. In this case, after the cryoballoon performs ablation on the tissue (e.g., the pulmonary vein ostium), the tissue ablation result may be uneven, for example, when a part of the tissue is ablated too much, the tissue is still ablated in place, and even when a leak occurs during ablation. If the ablation is excessive, the esophagus, the phrenic nerve and even the brain can be damaged. If the ablation is not in place, the electrical isolation effect of the tissue is not good, and the expected ablation purpose cannot be achieved. This not only reduces the effectiveness of cryoablation, but also increases the recurrence rate after atrial fibrillation treatment. The problem that the refrigerant sprays unevenly can be effectively solved to this application to effectively improve the homogeneity of cryoablation, improve the validity of cryoablation, and reduce the recurrence rate of treatment.

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

The fluid ejection device further comprises a cartridge 30, the connecting fluid channel 10 and the annular fluid channel 20 being arranged on the cartridge 30.

In one embodiment, the cylinder 30 has a circular radial cross-section, and the connecting fluid passage 10 and the annular fluid passage 20 are embedded inside the wall of the cylinder 30. The cylinder 30 has a sleeve-like structure with both ends open, the connecting fluid passage 10 and the annular fluid passage 20 are located between the inner and outer tube walls of the cylinder 30, and the nozzle is connected to the outside.

In another embodiment, the cylinder 30 has a circular radial cross section, and the connecting fluid passage 10 and the annular fluid passage 20 are fixedly arranged outside the tube wall of the cylinder 30; namely, the connecting fluid passage 10 and the annular fluid passage 20 are solid pipes fixedly arranged along the outer circumference of the cylinder 30, and the nozzle is arranged on the outer side surface of the fluid passage.

Preferably, the orifices are distributed axisymmetrically with respect to the axis of the cylinder 30 or mirror-symmetrically with respect to the axial section of the cylinder 30. Each nozzle includes at least one radial spray hole or at least one radial spray slot.

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

In particular, in the present embodiment, the axis of each jet lies 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 and each nozzle axis is parallel to the radial direction of the annular fluid channel 20.

In other embodiments of the invention, the annular channel inlet axis is at an angle to the axis of the annular fluid channel 20, the spout axis is 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 °, the injection requirement for the balloon can reach an optimal value due to the perpendicular structure of the annular channel inlet axis and the axis of the annular fluid channel 20. When the angle is 180 deg., the turbulence generated in the annular fluid passage 20 is minimal because the annular passage inlet axis is parallel to the axis of the annular fluid passage 20.

The connecting fluid channels 10 are distributed in axial symmetry with respect to the axis of the cylinder 30; alternatively, the connecting fluid channels 10 are arranged in mirror symmetry with respect to the axial section of the cylinder 30; alternatively, the connecting fluid channel 10 is helically distributed with respect to the axis of the cylinder 30.

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

In the embodiment of the present invention, the extending direction of the first main passage 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 (an axisymmetric pattern). Or the shape of the first branch path may be S-shaped, and the outlet of the first main path is connected at the central position of the S-shape (central symmetrical pattern).

The present invention further has an embodiment in which the number of the first branch lines is two, the two first branch lines form an X-shaped structure, the first main path is a straight line, and an outlet of the first main path is connected to a central position of the X-shaped structure. Or the number of the first branch paths can be two, the two ends of the first main path are both outlets, the middle part of the first main path is an inlet, and the outlets at the two ends of the first main path are both correspondingly connected with one first branch path, namely, the whole shape of the first branch unit is an I shape.

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

The fluid channel in the embodiment of the present invention includes a second branch unit, the second branch unit includes a second main path and second branch paths, inlets of the second branch paths are disposed in the middle of the second branch paths, outlets of the second branch paths are disposed at two end portions of the second branch paths, outlets of the two second branch paths are distributed in a central symmetry or axial symmetry manner with respect to the second main path, outlets of the second main path are connected with inlets of the second branch paths, the extending direction of the second main path is parallel to the axis of the cylinder 30, and outlets of the two second branch paths are connected with the two first branch units in a one-to-one correspondence manner.

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

The structure of the second main path and the second branch path may adopt the structure of the first branch unit in the above embodiments, such as a T shape or a Y shape. The diameter of the pipeline in the second branch unit is larger than or equal to that of the pipeline in the first branch unit, so that the flow speed of the fluid in the subsequent branch unit and the injection pressure of the radial injection hole can reach set values.

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

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

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

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

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

For example, in the embodiment of the present invention, the first branch and the second branch are straight branches, the third branch is a curved pipeline, the third branch includes two straight segments arranged in parallel at an interval and a connecting segment, and both ends of the connecting segment are connected to the same end of the two straight segments. The third branch is designed to reduce the influence of the third branch on the dynamic pressure and static pressure of the refrigerant, so as to achieve the preset purpose.

The first branch circuit, the second branch circuit and the third branch circuit can adopt the same structure or a combination form of different structures, and all that can meet the restriction that the flow resistance is the same in the above embodiments is sufficient.

In an embodiment not shown in the present application, the first branch, the second branch, and the third branch may be regarded as a tree-shaped branch unit, and tree-shaped branch units with different numbers may be selectively set according to the number of different nozzles, which is not described herein any more.

It should be noted that the cylinder 30 in the embodiment of the present invention may be integrally formed by using a 3D printing technology, and certainly, a split structure may also be used. The cylinder 30 of the split structure includes an inner cylinder and an outer cylinder, and the outer wall of the inner cylinder is provided with the groove-shaped first branch unit, the groove-shaped second branch unit, and the groove-shaped third branch unit. The distribution is the same as the above embodiments, and will not be described herein. The near-end sections and the far-end faces of the inner cylinder and the outer cylinder are welded or bonded, and corresponding positioning grooves are arranged for positioning.

The embodiment of the invention also provides a freezing balloon which comprises the fluid injection device. The freezing balloon catheter comprises a main body tube and a fluid tube, wherein the main body tube is arranged in an inner hole of the barrel 30 or in a hollow part of a cylindrical structure in a penetrating mode.

The fluid injection device in this embodiment may be sleeved outside the main body tube, and the fluid injection device and the main body tube may be connected by welding, bonding, or other fixed connection methods, or may be provided in a form in which the fluid injection device can slide relative to the main body tube.

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

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

As shown in fig. 5 and 6, the pressure distribution of the 8-hole pressure in the prior art is not uniform as seen in fig. 5, and the pressure distribution of the 8-hole pressure in the present application is much more uniform than that in the prior art as seen in fig. 6, and the present application has the following advantages compared with the prior art from the pressure distribution level: the application can avoid that the cryoablation effect of the tissue is uneven because the pressure distribution is uneven, even the ablation leak points are generated, the tissue potential isolation effect is poor, and therefore the cryoablation effectiveness is reduced, and the problem that the recurrence rate of atrial fibrillation is high after treatment is solved.

The above description is only exemplary of the invention and should not be taken as limiting the scope of the invention, so that the invention is intended to cover all modifications and equivalents of the embodiments described herein. In addition, the technical features, the technical schemes and the technical schemes can be freely combined and used.

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 spouts, the annular channel inlets are connected with the connecting channel outlets in a one-to-one correspondence mode, the spouts 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 orifices 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 orifices is less than a cross-sectional area of the connection channel inlet.

5. A fluid ejection device as claimed in claim 1, further comprising a barrel (30), the connecting fluid channel (10) and the annular fluid channel (20) each being provided on the barrel (30).

6. A fluid ejection device as in claim 5, wherein the cartridge (30) has an annular radial cross-section, the connecting fluid channel (10) and the annular fluid channel (20) both being provided inside a wall of the cartridge (30); or the cylinder (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 (10).

7. A fluid injection apparatus as claimed in claim 5, wherein the axis of each nozzle orifice lies within a radial cross-section of the same annular fluid passage (20).

8. A fluid ejection device as in claim 5, wherein the connecting fluid channels (10) are axisymmetrically distributed with respect to the axis of the barrel (30); or the connecting fluid channels (10) are distributed in mirror symmetry relative to the axial section of the cylinder (30); alternatively, the connecting fluid channel (10) is helically distributed with respect to the axis of the cylinder (30).

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

10. A cryoballoon comprising a fluid injection device, wherein the fluid injection device is as claimed in any one of claims 1 to 9.

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