CN213222960U - Mandrel assembly for ultrasonic spraying of support and ultrasonic spraying device thereof - Google Patents

Abstract

The utility model provides a support is dabber subassembly for ultrasonic spraying, it includes the dabber and presses the cover, the dabber includes main part, two at least archs and spacing portion, the main part is long and thin cylinder, the main part has relative first end and the second end that sets up, each protruding all along the center pin of main part extends, press the cover to pass through detachably sets up behind the first end is dabber, spacing portion sets up the second end, just it has first holding surface to press the cover, spacing portion has the second holding surface, wear the cover when the support and be in when the spindle time, the relative both ends of support are supported respectively first holding surface and on the second holding surface, just the support with leave the clearance between the arch. The utility model also provides an include the supersound spraying device of dabber subassembly. The formation of a drug coating on the inner surface of the stent can be prevented; the bracket and the mandrel can also be prevented from being adhered.

Description

Mandrel assembly for ultrasonic spraying of support and ultrasonic spraying device thereof

Technical Field

The utility model relates to an implanted medical instrument makes technical field, specifically relates to a dabber subassembly and ultrasonic spraying device thereof for support ultrasonic spraying.

Background

Drug eluting stents generally include a stent (as shown in fig. 1) and a drug coating disposed on the surface of the stent. The stent is a hollow structure with two ends penetrating through, and provides a supporting force for a cavity (such as a blood vessel) of a body so as to prevent or reduce the stenosis of the cavity, and the inner cavity of the stent is communicated with the cavity, so that fluid (such as blood) in the cavity can smoothly circulate through the inner cavity of the stent. The drug coating releases drugs to the lesion part of the cavity wall, and plays a role in treating and repairing the lesion part so as to prevent or reduce the restenosis of the cavity.

Because the stent is a hollow structure, the stent has an outer surface as well as an inner surface. When the medicine coating is arranged on the outer surface of the stent, the medicine coating is attached to the cavity wall, and the medicine coating can effectively release the medicine to the lesion part of the cavity wall. When the medicine coating is arranged on the inner surface of the stent, the medicine coating is not in contact with the cavity wall and cannot release medicines to the lesion part of the cavity wall, and when fluid in the cavity flows through the inner cavity of the stent, the medicines in the medicine coating are released into the fluid and then are possibly brought to the whole body of the body by the fluid to act on the tissues and organs of the whole body of the body, and unnecessary side effects are probably caused based on the types of the medicines in the medicine coating. Thus, it is desirable to provide a drug coating on the outer surface of the stent, while it is undesirable to provide a drug coating on the inner surface of the stent.

At present, the drug coating of the drug eluting stent is mainly arranged by adopting modes of ultrasonic spraying, coating, dipping and the like. Among them, ultrasonic spraying is widely used because it can obtain a drug coating having advantages of uniform coating thickness, controllable drug weight, etc.

An ultrasonic spray coating device for ultrasonic spray coating generally includes a drive assembly, a mandrel connected to the drive assembly, a spray head positioned above the mandrel, and an ultrasonic atomization assembly positioned to one side of the spray head. Before ultrasonic spraying, sleeving the support on the mandrel in a penetrating manner, and fixing two ends of the support; when ultrasonic spraying is carried out, the driving assembly and the ultrasonic atomization assembly are started, the mandrel is driven by the driving assembly to do reciprocating motion and rotary motion, the support is driven by the mandrel to do reciprocating rotary motion, and the liquid medicine is sprayed out by the spray head, is subjected to ultrasonic atomization by the ultrasonic atomization assembly and is then uniformly sprayed onto the support to form a medicine coating.

Because the stent is hollow, when the ultrasonic spraying is carried out, the liquid medicine can enter the inner cavity of the stent through the hollow part on one side of the stent, and then a medicine coating is formed on the inner surface on the opposite side of the stent. If the diameter of the mandrel is increased to enable the mandrel to be tightly attached to the inner surface of the stent, the drug coating can be effectively prevented from being formed on the inner surface of the stent. However, adhesion between the stent and the mandrel may occur due to the drug coating, and the stent may be damaged when removed from the mandrel.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dabber subassembly and ultrasonic spraying device for support ultrasonic spraying, wherein, support ultrasonic spraying can avoid support internal surface to form the medicine coating with the dabber subassembly to after ultrasonic spraying, the support is difficult for taking place the adhesion with this support ultrasonic spraying dabber subassembly, from this, can be convenient for take off the support.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a dabber subassembly is used in support ultrasonic spraying for support when ultrasonic spraying. The support is a hollow structure with two ends penetrating through, and the wall body of the support is formed by connecting support rods. The mandrel component for ultrasonic spraying of the support comprises a mandrel and a pressing sleeve, wherein the mandrel comprises a main body part, at least two bulges and a limiting part. The main body part is an elongated cylinder and is provided with a first end and a second end which are oppositely arranged. Each of the protrusions extends along a central axis of the body portion. When the number of the protrusions is two, the two protrusions are arranged on the outer surface of the main body part along the central axis of the main body part, and when the number of the protrusions is three or more, the three or more protrusions are uniformly arranged on the outer surface of the main body part along the circumferential direction of the main body part. The pressing sleeve passes through detachably behind the first end set up on the dabber, spacing portion sets up the second end, just the pressing sleeve has first holding surface, spacing portion has the second holding surface. When the support is sleeved on the mandrel in a penetrating mode, two opposite ends of the support are respectively supported on the first supporting surface and the second supporting surface, and a gap is reserved between the support and the protrusion.

In one embodiment, the inner diameter R of the circumscribed circular tube connected with the protrusion is the outer diameter of the protrusion, and 0.9 × the inner diameter of the stent is less than or equal to the outer diameter of the protrusion and less than the inner diameter of the stent.

In one embodiment, the protrusion is an elongated thin plate, a surface of the protrusion opposite to the outer surface of the main body is a first surface, and a width of the first surface is less than a distance from the first surface to the outer surface of the main body.

In one embodiment, the first surface is provided with at least one groove, and the width of the groove is larger than or equal to the width of the support rod of the support.

In one embodiment, the face of the protrusion at the first end for connecting the first surface and the outer surface of the body portion is a second surface, the second surface being a slope sloping from the first surface onto the outer surface of the body portion towards the first end.

In one embodiment, spacing portion includes mount table and limiting plate, the mount table sets up the second is served and with the main part is coaxial, the diameter of mount table > bellied external diameter, the number of limiting plate with bellied number equals, one the limiting plate corresponds one the arch, the limiting plate sets up on the surface of main part, just the lateral surface of limiting plate constitutes the second holding surface, the second holding surface is used for connecting mount table and corresponding the arch, the second holding surface is an inclined plane, from corresponding the department of protrusion slope extremely the edge of mount table.

In one embodiment, the pressing sleeve is a hollow structure with two ends penetrating through, and the inner diameter of the pressing sleeve is equal to the outer diameter of the protrusion.

In one embodiment, the pressing sleeve comprises a first section and a second section, the second section is in a circular truncated cone shape, the diameter of the second section is gradually reduced from the first section along the direction far away from the first section, and the outer surface of the second section forms the first supporting surface.

In one embodiment, the mandrel assembly for ultrasonic spraying of the stent further comprises a stop clip, and the stop clip is detachably clamped on the mandrel after passing through the first end.

The utility model also provides an ultrasonic spraying device, ultrasonic spraying device includes as above arbitrary the support is dabber subassembly for ultrasonic spraying, ultrasonic spraying device still includes drive assembly, shower nozzle and ultrasonic atomization subassembly, drive assembly with dabber detachably connects, is used for the drive reciprocating motion and rotary motion are to the dabber, the shower nozzle is located the top of dabber, ultrasonic atomization subassembly is located one side of shower nozzle.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model provides a dabber subassembly and ultrasonic spraying device for support ultrasonic spraying, wherein, the part that the surface of two adjacent archs and the main part of dabber subassembly for support ultrasonic spraying is located between two adjacent archs encloses to close and forms the isolation space. When ultrasonic spraying is carried out, liquid medicine can only enter into corresponding isolated space through the fretwork of support, under the isolation effect in isolated space, can't be sprayed on the internal surface of support to can not form the medicine coating on the internal surface of support. So, after the ultrasonic spraying, only form the medicine coating on the surface of support, and do not have the medicine coating on the internal surface of support, can avoid the medicine to be taken to the whole body of organism by the fluid to can avoid the medicine to produce the effect and then produce unnecessary side effect to the whole tissue organ of organism. Furthermore, a gap is reserved between the support and the protrusion, so that the adhesion phenomenon between the support and the mandrel due to the medicine coating can be reduced or avoided, the support can be easily taken down from the mandrel after the ultrasonic spraying is finished, and the support cannot be damaged.

Drawings

Fig. 1 is a schematic structural diagram of a support in the prior art (the support is a hollow structure with two ends penetrating, and a wall body of the support is formed by connecting a plurality of support rods).

Fig. 2 is an exploded schematic view of the mandrel assembly for ultrasonic spraying of the stent provided by the present invention.

Fig. 3 is a schematic view of the mandrel assembly for ultrasonic spraying of the stent shown in fig. 2 in combination (omitting the stopper clip).

Fig. 4 is a left side view of the main body portion and the protrusion of the mandrel assembly for ultrasonic stent spraying shown in fig. 2 (the protrusion is externally sleeved with an external circular tube).

Fig. 5 is an enlarged view of a portion a in fig. 2.

Fig. 6 is a schematic view of the engagement of the stent rod of the stent of fig. 1 with the groove on the first surface of the mandrel assembly for ultrasonic spraying of the stent of fig. 2.

Fig. 7 is a cross-sectional view of a press sleeve of the mandrel assembly for ultrasonic spraying of a stent shown in fig. 2.

Reference numerals:

the clamping device comprises a mandrel 1, a pressing sleeve 2, a stop clamp 3, a main body part 11, a protrusion 12, a limiting part 13, a connecting part 14, a first supporting surface 21, a first section 22, a second section 23, a first end 111, a second end 112, a first surface 121, a groove 122, a second surface 123, a second supporting surface 131, a mounting table 132 and a limiting plate 133.

Detailed Description

The technical solution of the present invention will be further explained by the following embodiments. It should be understood by those skilled in the art that the specific embodiments described are merely to aid in understanding the present invention and should not be considered as specific limitations of the present invention.

Referring to fig. 2 and 3, the present invention provides a mandrel assembly for ultrasonic spraying of a stent, which is used for supporting the stent during ultrasonic spraying. The mandrel component for ultrasonic spraying of the stent comprises a mandrel 1 and a pressing sleeve 2. The mandrel 1 comprises a main body portion 11, at least two protrusions 12 and a stopper portion 13. The body portion 11 is an elongated cylinder having a first end 111 and a second end 112 disposed opposite each other. Each protrusion 12 extends along a central axis of the body portion 11. When the protrusions 12 are two, the two protrusions 12 are provided on the outer surface of the main body portion 11 axisymmetrically along the central axis of the main body portion 11; when the protrusions 12 are three or more, the three or more protrusions 12 are uniformly provided on the outer surface of the main body portion 11 in the circumferential direction of the main body portion 11. The pressing sleeve 2 is detachably arranged on the mandrel 1 after passing through the first end 111, the limiting part 13 is arranged at the second end 112, the pressing sleeve 2 is provided with a first supporting surface 21, and the limiting part 13 is provided with a second supporting surface 131. When the stent is sleeved on the mandrel 1, two opposite ends of the stent are respectively supported on the first supporting surface 21 and the second supporting surface 131, and a gap is left between the stent and the protrusion 12.

Before ultrasonic spraying, the pressing sleeve 2 is taken down, the support is sleeved on the mandrel 1 from the first end 111 in a penetrating manner, and finally the pressing sleeve 2 is installed on the mandrel 1. At this time, the opposite ends of the bracket are supported on the first supporting surface 21 and the second supporting surface 131, respectively, and a gap is left between the bracket and the protrusion 12, that is, the bracket and the protrusion 12 are disposed in a non-contact manner. In addition, two adjacent protrusions 12 and the part of the outer surface of the main body portion 11 between two adjacent protrusions 12 enclose to form an isolation space. When ultrasonic spraying is carried out, liquid medicine can only enter into corresponding isolated space through the fretwork of support, under the isolation effect in isolated space, can't be sprayed on the internal surface of support to can not form the medicine coating on the internal surface of support. So, after the ultrasonic spraying, only form the medicine coating on the surface of support, and do not have the medicine coating on the internal surface of support, can avoid the medicine to be taken to the whole body of organism by the fluid to can avoid the medicine to produce the effect and then produce unnecessary side effect to the whole tissue organ of organism. Furthermore, a gap is reserved between the support and the bulge 12, so that the adhesion phenomenon between the support and the mandrel 1 due to the medicine coating can be reduced or avoided, and after the ultrasonic spraying is finished, the support can be easily taken down from the mandrel 1 without damaging the support.

In the present embodiment, the main body 11 is an optical axis, which is easy to machine and form, and can avoid damage to the bracket when the bracket is inserted or removed.

In the present embodiment, four protrusions 12 are uniformly arranged on the outer surface of the main body 11 along the circumferential direction of the main body 11, and the included angle between two adjacent protrusions 12 is 90 °. It will be appreciated that in other embodiments not shown, the projections 12 may also be two, three, five or more, preferably three or four projections 12.

Referring to fig. 4, in the present embodiment, the inner diameter R of the circumscribed circular tube connected to the protrusion 12 is the outer diameter of the protrusion 12. Based on the above, when the stent is sleeved on the mandrel 1, a gap is left between the stent and the protrusion 12, and therefore, the outer diameter of the protrusion 12 is less than the inner diameter of the stent. However, the outer diameter of the projection 12 cannot be too small, otherwise the isolation of the isolation space would be weakened or fail. Specifically, when the outer diameter of the projection 12 is too small, the gap between the stent and the projection 12 is too large, and after the medical fluid enters the corresponding isolated space, the medical fluid may enter other isolated spaces through the gap between the stent and the projection 12, thereby adhering to the inner surface of the stent to form a drug coating. Thus, the outer diameter range of the projection 12 is: 0.9 times the inner diameter of the holder < the outer diameter of the projection 12 < the inner diameter of the holder, preferably 0.95 times the inner diameter of the holder < the outer diameter of the projection 12 < the inner diameter of the holder.

In the present embodiment, the protrusion 12 is a long thin plate, and the surface of the protrusion 12 facing the outer surface of the main body 11 is the first surface 121. The bracket and the protrusion 12 are arranged in a non-contact manner, and specifically, the bracket and the first surface 121 are arranged in a non-contact manner. In the present embodiment, the width of the first surface 121 < the distance from the first surface 121 to the outer surface of the body portion 11. Thus, the isolation space has a greater depth, the isolation effect to the liquid medicine can be enhanced, and the adhesion phenomenon between the stent and the outer surface of the main body portion 11 due to the medicine coating can be prevented. In addition, the width of the first surface 121 is small, i.e., the first surface 121 is a narrow surface, which further reduces or avoids the possibility of adhesion between the stent and the first surface 121 due to the drug coating.

Referring to fig. 5 and 6, in the present embodiment, at least one groove 122 is disposed on the first surface 121, and the width of the groove 122 is greater than or equal to the width of the support rod of the bracket. Although, as described above, the stent has been supported by the first and second supporting surfaces 21 and 131 such that the stent is disposed in non-contact with the first surface 121 and the first surface 121 is disposed as a narrow surface, in practice, the gap between the stent struts and the first surface 121 is relatively small, and it is likely that a sufficient amount of medical fluid will enter between the stent struts and the first surface 121, and then solidify to form a drug coating, causing adhesion between the stent struts and the first surface 121. By providing the groove 122, the gap between the stent strut and the first surface 121 is increased, thereby further reducing or avoiding the possibility of adhesion between the stent and the first surface 121 due to the drug coating. It is understood that the depth of the groove 122 can be increased as much as possible without affecting the use performance. In addition, the number of the grooves 122 can be matched with the number of the support rods of the support. Because a cradling piece of support may correspond two or more than two first surfaces 121, consequently, the number of recess 122 matches with the number of the cradling piece of support and does not mean that the number of recess 122 is equal to the number of the cradling piece of support, but means when the cradling piece below of support is first surface 121, all correspond and seted up recess 122.

In the present embodiment, a face of the protrusion 12 at the first end 111 for connecting the first surface 121 and the outer surface of the main body portion 11 is the second surface 123. The second surface 123 is a slope inclined from the first surface 121 toward the first end 111 to the outer surface of the main body 11. In this way, the projections 12 can be prevented from scratching the stent during the process of inserting the stent into the mandrel 1 or during the process of removing the stent from the mandrel 1. To further prevent the projections 12 from scratching the holder, a chamfer is provided between the first surface 121 and the second surface 123.

In the present embodiment, the stopper portion 13 includes the mount table 132 and the stopper plate 133. The mounting table 132 is a cylinder, the mounting table 132 is disposed on the second end 112 and is coaxial with the main body 11, and the diameter of the mounting table 132 is larger than the outer diameter of the protrusion 12. The number of the limit plates 133 is equal to the number of the protrusions 12, and one limit plate 133 corresponds to one protrusion 12. The position limiting plate 133 is disposed on the outer surface of the main body 11, the outer side surface of the position limiting plate 133 is the second supporting surface 131, the second supporting surface 131 is used for connecting the mounting platform 132 and the corresponding protrusion 12, and the second supporting surface 131 is an inclined surface inclined from the corresponding protrusion 12 to the edge of the mounting platform 132. The second support surface 131 is designed as an inclined surface to facilitate the second support surface 131 to extend into and support the end of the bracket. In the present embodiment, the stopper plate 133 is a substantially triangular thin plate.

In the present embodiment, the mandrel 1 further includes a connecting portion 14, the connecting portion 14 is disposed coaxially with the mounting table 132, one end of the connecting portion 14 is connected to the mounting table 132, and the other end of the connecting portion 14 has an open structure. The connecting portion 14 has a hollow structure, and an internal thread is provided on an inner surface of the connecting portion 14.

In the present embodiment, the main body 11, the protrusion 12, the stopper 13, and the connecting portion 14 are integrally formed, but it is to be understood that in other embodiments not shown, the main body 11, the protrusion 12, the stopper 13, and the connecting portion 14 may be formed separately and then connected by welding or the like.

Referring to fig. 7, in the present embodiment, the pressing sleeve 2 has a hollow structure with two ends penetrating through, and an inner diameter of the pressing sleeve 2 is equal to an outer diameter of the protrusion 12, so that the pressing sleeve 2 can be detachably inserted on the mandrel 1 from the first end 111, and specifically, the pressing sleeve 2 can be detachably inserted on the protrusion 12 from the first end 111.

In the present embodiment, the press sleeve 2 includes a first stage 22 and a second stage 23. The first segment 22 is cylindrical, and it is understood that in other embodiments not shown, the first segment 22 may also be other regular shapes, and may also be irregular shapes, and is not limited herein. The second section 23 is in a circular truncated cone shape, the diameter of the second section 23 gradually decreases from the first section 22 along a direction away from the first section 22, and the outer surface of the second section 23 forms a first supporting surface 21. The diameter of the second section 23 decreases from the first section 22 in a direction away from the first section 22 to facilitate the first support surface 21 to extend into and support the end of the stent.

In the present embodiment, the inner cavity of the pressure sleeve 2 is a cylindrical inner cavity. It will be appreciated that in other embodiments, not shown, the inner cavity of the pressure jacket 2 may also be non-cylindrical, in particular the inner cavity of the pressure jacket 2 comprises a main cavity and a secondary cavity arranged around the main cavity. Each auxiliary cavity is communicated with the main cavity, the number of the auxiliary cavities is equal to that of the protrusions 12, the size of each auxiliary cavity is matched with that of the protrusions 12, and when the pressing sleeve 2 is sleeved on the mandrel 1 in a penetrating mode, the portion, close to the first end 111, of each protrusion 12 is contained in the corresponding auxiliary cavity. Further, the outer surface of the second segment 23 may be recessed downward at the portions of two adjacent auxiliary cavities, so that the portions of the outer surface of the second segment 23 corresponding to the auxiliary cavities are protruded relatively to correspond to the limiting plate 133, so that the whole body is more beautiful.

In this embodiment, the mandrel assembly for ultrasonic stent spraying further comprises a stopper clip 3. The stop clamp 3 is detachably clamped on the mandrel 1 after passing through the first end 111. Specifically, after the support and the pressing sleeve 2 are sleeved on the mandrel 1 one by one, the stop clamp 3 is clamped on the mandrel 1 to play a role of stopping, and the support and the pressing sleeve 2 are prevented from falling off from the mandrel 1 during ultrasonic spraying. After the ultrasonic spraying is finished, the pressing sleeve 2 and the bracket can be taken down one by one after the stop clamp 3 is removed.

The utility model also provides an ultrasonic spraying device, including the aforesaid support is dabber subassembly for ultrasonic spraying, still include drive assembly, shower nozzle and ultrasonic atomization subassembly. The driving assembly is detachably connected with the mandrel 1 through a connecting part 14 in a threaded manner and is used for driving the mandrel 1 to do reciprocating motion and rotating motion. The spray head is positioned above the mandrel 1, the ultrasonic atomization assembly is positioned at one side of the spray head, and the liquid medicine is sprayed out by the spray head, is subjected to ultrasonic atomization by the ultrasonic atomization assembly and is then uniformly sprayed onto the support to form a medicine coating.

The utility model provides a support is dabber subassembly for ultrasonic spraying, its two adjacent protruding 12 and main part 11 the surface lie in adjacent two portions between protruding 12 and enclose to close and form the isolation space. When ultrasonic spraying is carried out, liquid medicine can only enter into corresponding isolated space through the fretwork of support, under the isolation effect in isolated space, can't be sprayed on the internal surface of support to can not form the medicine coating on the internal surface of support. So, after the ultrasonic spraying, only form the medicine coating on the surface of support, and do not have the medicine coating on the internal surface of support, can avoid the medicine to be taken to the whole body of organism by the fluid to can avoid the medicine to produce the effect and then produce unnecessary side effect to the whole tissue organ of organism. Furthermore, a gap is reserved between the support and the bulge 12, so that the adhesion phenomenon between the support and the mandrel 1 due to the medicine coating can be reduced or avoided, and after the ultrasonic spraying is finished, the support can be easily taken down from the mandrel 1 without damaging the support. Additionally, the utility model provides an ultrasonic spraying device includes the aforesaid support is dabber subassembly for ultrasonic spraying, consequently, has the aforesaid support is dabber subassembly for ultrasonic spraying's whole beneficial effect, no longer repeated here.

The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.

Claims (10)

1. The utility model provides a support is dabber subassembly for ultrasonic spraying for support frame when ultrasonic spraying, the hollow structure that the support runs through for both ends, the wall body of support comprises the cradling piece connection, its characterized in that: the mandrel component for ultrasonic spraying of the support comprises a mandrel and a pressing sleeve, the mandrel comprises a main body part, at least two bulges and a limiting part, the main body part is a slender cylinder, the main body part is provided with a first end and a second end which are oppositely arranged, each bulge extends along the central shaft of the main body part, when the bulges are two, the two bulges are symmetrically arranged on the outer surface of the main body part along the central shaft of the main body part, when the bulges are three or more, the three or more bulges are uniformly arranged on the outer surface of the main body part along the circumferential direction of the main body part, the pressing sleeve is detachably arranged on the mandrel after passing through the first end, the limiting part is arranged at the second end, the pressing sleeve is provided with a first supporting surface, and the limiting part is provided with a second supporting surface, when the support is sleeved on the mandrel in a penetrating mode, two opposite ends of the support are respectively supported on the first supporting surface and the second supporting surface, and a gap is reserved between the support and the protrusion.

2. The mandrel assembly for ultrasonic spraying of a stent of claim 1 wherein: the inner diameter R of the external round pipe connected with the bulge is the outer diameter of the bulge, and the inner diameter of the bracket is not more than 0.9 multiplied by the outer diameter of the bulge and less than the inner diameter of the bracket.

3. The mandrel assembly for ultrasonic spraying of a stent of claim 1 wherein: the protrusion is a strip-shaped thin plate, the surface of the protrusion opposite to the outer surface of the main body part is a first surface, and the width of the first surface is smaller than the distance from the first surface to the outer surface of the main body part.

4. A mandrel assembly for ultrasonic spraying of stents as defined in claim 3 wherein: the first surface is provided with at least one groove, and the width of the groove is larger than or equal to that of the support rod of the support.

5. A mandrel assembly for ultrasonic spraying of stents as defined in claim 3 wherein: the protrusion has a second surface at the first end for connecting the first surface and the outer surface of the main body, and the second surface is an inclined surface inclined from the first surface toward the first end onto the outer surface of the main body.

6. The mandrel assembly for ultrasonic spraying of a stent of claim 2 wherein: spacing portion includes mount table and limiting plate, the mount table sets up the second is served and with the main part is coaxial, the diameter of mount table > bellied external diameter, the number of limiting plate with bellied number equals, one the limiting plate corresponds one it is protruding, the limiting plate sets up on the surface of main part, just the lateral surface of limiting plate constitutes the second holding surface, the second holding surface is used for connecting mount table and corresponding the arch, the second holding surface is an inclined plane, corresponds certainly the arch department slopes to the edge of mount table.

7. The mandrel assembly for ultrasonic spraying of a stent of claim 2 wherein: the pressing sleeve is of a hollow structure with two ends penetrating through, and the inner diameter of the pressing sleeve is equal to the outer diameter of the protrusion.

8. The mandrel assembly for ultrasonic spraying of a stent of claim 7 wherein: the pressure sleeve comprises a first section and a second section, the second section is in a round table shape, the diameter of the second section is gradually reduced from the first section along the direction away from the first section, and the outer surface of the second section forms the first supporting surface.

9. The mandrel assembly for ultrasonic spraying of a stent of claim 1 wherein: the mandrel component for ultrasonic spraying of the support further comprises a stopping clamp, and the stopping clamp is detachably clamped on the mandrel after passing through the first end.

10. An ultrasonic spraying device is characterized in that: the ultrasonic spraying device comprises the mandrel component for ultrasonic spraying of the bracket according to any one of claims 1 to 9, and further comprises a driving component, a spray head and an ultrasonic atomization component, wherein the driving component is detachably connected with the mandrel and used for driving the mandrel to do reciprocating motion and rotary motion, the spray head is positioned above the mandrel, and the ultrasonic atomization component is positioned on one side of the spray head.

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