CN216135924U - Ultrasonic catheter withdrawing device and intravascular ultrasonic imaging system - Google Patents

Abstract

The utility model discloses an ultrasonic catheter withdrawing device and an intravascular ultrasonic imaging system, which comprise: a power mechanism for outputting rotational power; the output end rotating shaft is movably connected with the fixed base so as to drive the ultrasonic catheter on the bracket which is rotationally connected with the output end rotating shaft to move when the output end rotating shaft rotates; the first half clutch piece is connected with the output end of the power mechanism; the second half clutch piece can move axially relative to the output end rotating shaft and is combined with or separated from the first half clutch piece; and a circumferential limit is arranged between the second half clutch piece and the output end rotating shaft, so that the second half clutch piece and the output end rotating shaft can synchronously rotate. Compared with the prior art, the second half clutch piece and the output end rotating shaft are convenient to process and assemble, the problem that the withdrawing precision is low due to processing dimension errors and assembling errors can be solved, and the withdrawing precision of the ultrasonic catheter can be improved.

Description

Ultrasonic catheter withdrawing device and intravascular ultrasonic imaging system

Technical Field

The utility model relates to the technical field of medical instruments, in particular to an ultrasonic catheter withdrawing device. In addition, the utility model also relates to an intravascular ultrasonic imaging system comprising the ultrasonic catheter withdrawing device.

Background

At present, intravascular ultrasound imaging systems are commonly used in medicine to examine the condition of the inner wall of a blood vessel using ultrasound technology.

The intravascular ultrasonic imaging system comprises a support for bearing, an ultrasonic catheter arranged on the support, an ultrasonic catheter withdrawing device and a base with a fixed position, wherein the ultrasonic catheter withdrawing device comprises a power mechanism, a clutch mechanism and an output end rotating shaft, the output end rotating shaft is movably connected with the base, and the output end rotating shaft is rotatably arranged on the support so as to drive the support to integrally move relative to the base when the output end rotating shaft rotates, so that the withdrawal of the ultrasonic catheter is realized.

When the clutch mechanism is combined, the power mechanism is used as a power source, and finally the rotating shaft of the output end is driven to rotate through the torque transmission effect of the clutch mechanism, so that the automatic retraction of the ultrasonic catheter is realized; when the clutch mechanism is separated, the rotating shaft of the output end is rotated under the manual thrust, and then the ultrasonic catheter is manually retracted.

The clutch mechanism in the prior art comprises an upper clutch part and a lower clutch part, wherein the upper clutch part is connected with the output end of a power mechanism, and the lower clutch part and an output end rotating shaft are of an integrated structure. However, the lower clutch part and the output end rotating shaft are of an integrated structure, so that various inconveniences are brought to processing and manufacturing, the consistency of dimensional accuracy is difficult to guarantee if the lower clutch part and the output end rotating shaft are opened by plastic, and the assembly is inconvenient and difficult to guarantee due to the limitation of installation space; in addition, such a unitary structure is not versatile.

In summary, how to solve the problems of inconvenience in processing, manufacturing and assembling caused by the fact that the lower clutch part and the output end rotating shaft are integrated into a whole structure, and the problem of low withdrawal precision caused by processing dimension errors and assembling errors, is a problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, an object of the present invention is to provide an ultrasound catheter retracting device, wherein the second clutch half and the output shaft are easy to process and assemble, and the problem of low retracting precision caused by processing dimension errors and assembling errors can be avoided, so as to improve the retracting precision of the ultrasound catheter.

Another object of the present invention is to provide an intravascular ultrasound imaging system including the above ultrasound catheter retraction device, in which the ultrasound catheter retraction accuracy is high.

In order to achieve the above purpose, the utility model provides the following technical scheme:

an ultrasonic catheter retraction device comprising:

a power mechanism for outputting rotational power;

the output end rotating shaft is movably connected with the fixed base so as to drive the ultrasonic catheter on the bracket which is rotationally connected with the output end rotating shaft to move relative to the base when the output end rotating shaft rotates;

the first half clutch piece is connected with the output end of the power mechanism;

the second half clutch piece can move axially relative to the output end rotating shaft and is combined with or separated from the first half clutch piece; and a circumferential limit is arranged between the second half clutch and the output end rotating shaft, so that the second half clutch and the output end rotating shaft can synchronously rotate.

Preferably, the second clutch half is connected with the output end rotating shaft through a spline pair.

Preferably, the spline pair is a rolling spline pair, the second half clutch piece is connected with a spline sleeve of the rolling spline pair, and the output end rotating shaft is connected with a spline shaft of the rolling spline pair.

Preferably, the second clutch half is coupled to the spline housing by a fastener.

Preferably, the output end rotating shaft is in threaded connection with the spline shaft.

Preferably, the spline shaft further comprises a jackscrew for locking the output end rotating shaft and the spline shaft.

Preferably, the second clutch half is connected with the output end rotating shaft through a linear bearing.

Preferably, the clutch device further comprises a force application device for applying an external force to the second clutch half to axially move the second clutch half relative to the output end rotating shaft.

Preferably, the force applying means comprises:

an input swing lever for swinging manually;

the output shifting fork is used for applying external force to the second half clutch piece to enable the second half clutch piece to be far away from the first half clutch piece;

and the transmission assembly is connected between the input oscillating bar and the output shifting fork, and the input oscillating bar, the transmission assembly and the output shifting fork form a link mechanism so that the output shifting fork applies external force to the second half clutch piece when manual force is applied to the input oscillating bar.

Preferably, the force application device further comprises an elastic member for driving the second clutch half to be combined with the first clutch half after the external force applied to the second clutch half by the output fork is removed.

An intravascular ultrasound imaging system comprises an ultrasound catheter withdrawing device, wherein the ultrasound catheter withdrawing device is any one of the ultrasound catheter withdrawing devices.

The ultrasonic guide tube withdrawing device provided by the utility model is characterized in that when the second half clutch piece moves axially relative to the output end rotating shaft to enable the second half clutch piece to be combined with the first half clutch piece, the ultrasonic guide tube withdrawing device is in an automatic withdrawing mode, at the moment, a power mechanism outputs rotary power to drive the first half clutch piece to rotate together, the first half clutch piece and the second half clutch piece are in a combined state, so that torque can be transmitted to the second half clutch piece, and circumferential limit is arranged between the second half clutch piece and the output end rotating shaft, so that the torque can be transmitted to the output end rotating shaft to enable the output end rotating shaft and the second half clutch piece to synchronously rotate, and when the output end rotating shaft rotates, the automatic withdrawing of the ultrasonic guide tube can be realized. When the second half clutch piece moves axially relative to the output end rotating shaft to separate the second half clutch piece from the first half clutch piece, the ultrasonic catheter withdrawing device is in a manual withdrawing mode, and at the moment, the second half clutch piece and the output end rotating shaft can synchronously rotate through manual thrust to realize manual withdrawing of the ultrasonic catheter.

It can be seen that the utility model improves the structure form that the lower clutch part and the output end rotating shaft are integrated into a split structure in the prior art, that is, the second half clutch and the output end rotating shaft are independent structural parts respectively, and meanwhile, the second half clutch can axially move relative to the output end rotating shaft and has circumferential limit between the second half clutch and the output end rotating shaft, thereby realizing the combination or separation movement of the second half clutch and the first half clutch and the synchronous rotation of the second half clutch and the output end rotating shaft. Therefore, the problems of inconvenience in processing, manufacturing and assembling and the like caused by the fact that the second half clutch and the output end rotating shaft are designed into an integrated structural part can be avoided, and the problems of low withdrawing precision and the like caused by processing dimension errors and assembling errors are avoided. In addition, relative to the integrated structural member, the second half clutch piece can axially move relative to the output end rotating shaft, so that the load of the second half clutch piece when the second half clutch piece is separated from and combined with the first half clutch piece is reduced, and the driving force for separating and combining the second half clutch piece with the first half clutch piece is saved. Meanwhile, the structural form that the second half clutch piece and the output end rotating shaft are connected after being processed in a split mode also has better universality.

The intravascular ultrasonic imaging system provided by the utility model comprises the ultrasonic catheter withdrawing device and has the beneficial effects.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural view of an ultrasound catheter retraction device according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of fig. 1.

The reference numerals in fig. 1 and 2 are as follows:

the device comprises a power mechanism 1, a micro motor 11, a main synchronous pulley 12, a synchronous belt 13, a slave synchronous pulley 14, an output end rotating shaft 2, a first half clutch 3, a second half clutch 4, a spline sleeve 51, a spline shaft 52, an input swing rod 61, an output shifting fork 62, a transmission assembly 63, an elastic member 64, a code disc 71, a code disc rotation angle detector 72, a gear 8 and a support 9.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The core of the utility model is to provide an ultrasonic catheter withdrawing device, wherein the second half clutch part and the output end rotating shaft of the ultrasonic catheter withdrawing device are convenient to process and assemble, and the problem of low withdrawing precision caused by processing dimension errors and assembly errors can be solved, so that the withdrawing precision of the ultrasonic catheter can be improved. Another core of the present invention is to provide an intravascular ultrasound imaging system including the ultrasound catheter retraction device, wherein the ultrasound catheter retraction accuracy is high.

Referring to fig. 1-2, fig. 1 is a schematic structural diagram of an ultrasound catheter retraction device according to an embodiment of the present invention; fig. 2 is a cross-sectional view of fig. 1.

The utility model provides an ultrasonic catheter withdrawing device which comprises a power mechanism 1, an output end rotating shaft 2, a first half clutch piece 3 and a second half clutch piece 4.

Specifically, the power mechanism 1 is used for outputting rotary power, and the first half clutch 3 is connected with the output end of the power mechanism 1, so that the power mechanism 1 drives the first half clutch 3 to rotate when the power mechanism 1 outputs rotary power. Output pivot 2 is used for base swing joint with the rigidity, and simultaneously, the technical staff in the field can know that, the rotatable support 9 that is used for bearing of locating of output pivot 2, and support 9 is equipped with the supersound pipe, when output pivot 2 rotates, drives the whole relative base of support 9 and removes to realize the withdrawal motion of supersound pipe. The second half clutch piece 4 can axially move relative to the output end rotating shaft 2, and when the second half clutch piece 4 moves, the second half clutch piece 4 can be combined with or separated from the first half clutch piece 3; when the second half clutch 4 is combined with the first half clutch 3, torque can be transmitted, and when the second half clutch 4 is separated from the first half clutch 3, the rotating power provided by the power mechanism 1 for the second half clutch 4 can be cut off. Meanwhile, a circumferential limit is arranged between the second half clutch 4 and the output end rotating shaft 2, so that the second half clutch 4 and the output end rotating shaft 2 can synchronously rotate.

In the working process, when the second half clutch piece 4 moves axially relative to the output end rotating shaft 2 to enable the second half clutch piece 4 to be combined with the first half clutch piece 3, the ultrasonic catheter withdrawing device is in an automatic withdrawing mode, at the moment, the power mechanism 1 outputs rotary power to drive the first half clutch piece 3 to rotate together, as the first half clutch piece 3 and the second half clutch piece 4 are in a combining state, the torque can be transmitted to the second half clutch piece 4, and as the circumferential limit is arranged between the second half clutch piece 4 and the output end rotating shaft 2, the torque can be transmitted to the output end rotating shaft 2, the output end rotating shaft 2 and the second half clutch piece 4 rotate synchronously, and when the output end rotating shaft 2 rotates, the withdrawing of the ultrasonic catheter can be achieved.

When the second half clutch 4 moves axially relative to the output end rotating shaft 2 to separate the second half clutch 4 from the first half clutch 3, the ultrasonic catheter withdrawing device is in a manual withdrawing mode, and at the moment, the second half clutch 4 and the output end rotating shaft 2 can synchronously rotate through manual thrust to realize the manual withdrawing of the ultrasonic catheter.

It can be seen that the structure form that the lower clutch part and the output end rotating shaft 2 are integrated in the prior art is improved into a split structure, that is, the second half clutch 4 and the output end rotating shaft 2 are independent structural members, and meanwhile, the second half clutch 4 can axially move relative to the output end rotating shaft 2 and circumferential limit is formed between the second half clutch 4 and the output end rotating shaft 2, so that the combination or separation movement of the second half clutch 4 and the first half clutch 3 and the synchronous rotation of the second half clutch 4 and the output end rotating shaft 2 are realized. Therefore, the problems of inconvenient processing, manufacturing, assembly and the like caused by designing the second half clutch part 4 and the output end rotating shaft 2 into an integrated structural part can be avoided, and the problems of low withdrawal precision and the like caused by processing dimension errors and assembly errors are avoided, so that the withdrawal precision of the ultrasonic catheter can be improved.

In addition, compared with the mode that the second half clutch 4 and the output end rotating shaft 2 are designed into an integral structural member, the second half clutch 4 can axially move relative to the output end rotating shaft 2, and the load of the second half clutch 4 and the first half clutch 3 during separation and combination is reduced, so that the ultrasonic catheter withdrawing device can also save the driving force for separating and combining the second half clutch 4 and the first half clutch 3.

Furthermore, compared with an integrated structural member, the structural form that the second half clutch member 4 and the output end rotating shaft 2 are connected after being processed in a split mode also has better universality.

It should be noted that, in this embodiment, a specific implementation form that the second half clutch 4 can axially move relative to the output end rotating shaft 2 and the circumferential limit is provided between the second half clutch 4 and the output end rotating shaft 2 is not limited, for example, a scheme may be adopted in which one of the second half clutch 4 and the output end rotating shaft 2 is provided with a groove extending in the axial direction, the other is provided with a protruding ridge slidably engaged with the groove, and a gap between the protruding ridge and the groove is as small as possible, so that the circumferential limit between the second half clutch 4 and the output end rotating shaft 2 is ensured by using a concave-convex engagement relationship between the protruding ridge and the groove; of course, it is also possible to have the ribs in lateral abutting contact with the grooves, so that when it is desired to move second clutch half 4, only sufficient force needs to be applied to second clutch half 4 to overcome the frictional force between the ribs and grooves. The convex ridge can be a limit pin, for example, the limit pin is arranged on the second half clutch piece 4, the output end rotating shaft 2 is provided with a groove, so that the limit pin is inserted into the groove, and when the second half clutch piece 4 moves, the limit pin moves along the groove; when the second half clutch 4 rotates, the output end rotating shaft 2 is driven to rotate together under the mechanical limiting effect of the limiting pin on the groove.

In order to improve the accuracy of the circumferential spacing between the second clutch half 4 and the output shaft 2, as a preferable scheme, on the basis of the above embodiment, the second clutch half 4 and the output shaft 2 are connected through a spline pair. For example, one of the second half clutch 4 and the output end rotating shaft 2 is provided with an external spline, the other one is provided with an internal spline, circumferential spacing between the second half clutch 4 and the output end rotating shaft 2 is realized through the matching of the external spline and the internal spline, and the second half clutch 4 can axially move relative to the output end rotating shaft 2 under the action of external force.

It should be noted that, an external spline structure may be directly provided on one of the second half clutch 4 and the output end rotating shaft 2, and an internal spline structure may be provided on the other, so that the second half clutch 4 and the output end rotating shaft 2 are connected by the cooperation of the external spline structure and the internal spline structure. Spline housing 51 and spline shaft 52 may also be introduced, and by connecting one of second clutch half 4 and output shaft 2 to spline housing 51 and the other to spline shaft 52, indirect connection between second clutch half 4 and output shaft 2 is achieved by fitting spline housing 51 to spline shaft 52.

It can be seen that, in the above, no matter the second half clutch 4 is connected with the output end rotating shaft 2 through the matching of the convex edge and the groove, or the second half clutch 4 is connected with the output end rotating shaft 2 through the spline pair, when the second half clutch 4 moves, sliding friction occurs between the convex edge and the groove and between the spline pair, and with the increase of the use time, inevitable gaps occur between the convex edge and the groove and between the spline pair, so that the precision of circumferential spacing between the second half clutch 4 and the output end rotating shaft 2 is reduced, the second half clutch 4 and the output end rotating shaft 2 cannot rotate synchronously in the starting stage, and a retraction distance error is introduced.

Therefore, in order to further improve the accuracy of the circumferential spacing between second clutch half 4 and output shaft 2, as a preferable solution, based on the above embodiment, the spline pair is a rolling spline pair, second clutch half 4 is connected to spline housing 51 of the rolling spline pair, and output shaft 2 is connected to spline shaft 52 of the rolling spline pair.

It is understood that when second clutch half 4 is moved, spline housing 51 of the rolling spline pair makes linear motion on spline shaft 52 of the rolling spline pair by the balls therein, rolling friction is generated, friction is small, and smoothness of axial movement of second clutch half 4 is ensured. In addition, the rolling spline pair can transmit torque, and the torsional rigidity and the moment rigidity are high, so that gapless torque transmission between the second half clutch 4 and the output end rotating shaft 2 can be realized, the rotation synchronism of the second half clutch 4 and the output end rotating shaft 2 is good, the rotation precision is high, and the retraction distance error can be avoided.

Of course, other solutions may be adopted to ensure the accuracy of circumferential spacing between second clutch half 4 and output shaft 2, and to ensure the smoothness of axial movement of second clutch half 4, for example, the connection between second clutch half 4 and output shaft 2 is through a linear bearing.

It can be understood that the linear bearing can firstly ensure the smoothness of the axial movement of the second half clutch 4, and in addition, when the second half clutch 4 is applied with the rotating power, the linear bearing can drive the output end rotating shaft 2 to integrally rotate, so that the second half clutch 4 and the output end rotating shaft 2 have better rotation synchronism.

When second clutch half 4 is connected to output shaft 2 by a rolling spline pair, second clutch half 4 is connected to spline housing 51 by a fastening member in consideration of the specific connection manner of second clutch half 4 to spline housing 51 in the above embodiment. Preferably, the fastener is a fastening pin. That is, when the second clutch half 4 is moved or rotated, the second clutch half 4 is moved or rotated synchronously with the spline housing 51 by the force or torque transmission action of the fastening member. This connection is simple and facilitates the fixed connection of the second clutch half 4 to the spline housing 51.

In addition, in consideration of the specific connection manner between the output-side rotating shaft 2 and the spline shaft 52, on the basis of the above-described embodiment, the output-side rotating shaft 2 is screwed to the spline shaft 52. That is, the present embodiment achieves the fixed connection of the output-side rotating shaft 2 and the spline shaft 52 by screwing, so that the output-side rotating shaft 2 rotates together with the spline shaft 52 when the spline shaft 52 rotates under the torque transmission action of the spline housing 51. The thread structure is convenient to process and assemble, so that the fixed connection between the output end rotating shaft 2 and the spline shaft 52 is convenient to realize.

Further, in order to prevent the loosening of the thread between the output-side rotating shaft 2 and the spline shaft 52, a jackscrew for locking the output-side rotating shaft 2 and the spline shaft 52 is further included on the basis of the above-described embodiment. That is to say, this embodiment can further strengthen the locking force between output pivot 2 and the integral key shaft 52 under the tight effect in top of jackscrew, through the dual function of threaded connection and jackscrew, can ensure the fastness of being connected between output pivot 2 and the integral key shaft 52, ensures that both can rotate synchronously all the time.

In order to realize the axial movement of second clutch half 4, on the basis of the above-mentioned embodiment, a force application device is further included for applying an external force to second clutch half 4 to axially move second clutch half 4 relative to output-side rotating shaft 2. That is, the present embodiment applies an external force to the second clutch half 4 by the force applying means to move the second clutch half 4 axially.

The specific structure of the force application device is not limited in this embodiment, and those skilled in the art can set the force application device according to actual requirements, as long as the force application device can apply external force to the second clutch half 4 to move the second clutch half along the axial direction.

Preferably, on the basis of the above embodiment, the force application device comprises an input swing link 61, an output fork 62 and a transmission assembly 63, wherein the input swing link 61 is used for manual operation to realize the swing of the input swing link 61 through the manual operation; the output shifting fork 62 is used for applying external force to the second half clutch piece 4 to enable the second half clutch piece 4 to be far away from the first half clutch piece 3; the transmission assembly 63 is connected between the input swing link 61 and the output fork 62, and is used for transmitting the motion of the input swing link 61 to the output fork 62, and the input swing link 61, the transmission assembly 63 and the output fork 62 form a link mechanism, so that the output fork 62 applies an external force to the second clutch half 4 when a manual force is applied to the input swing link 61.

That is to say, the force application device is a link mechanism, the input swing rod 61 is rotated through manual operation, and then under the action of motion transmission of the transmission assembly 63, motion is finally output through the output shifting fork 62, so that the output shifting fork 62 applies external force to the second half clutch member 4, the second half clutch member 4 is far away from the first half clutch member 3, and separation of the second half clutch member 4 and the first half clutch member 3 is realized, so that the second half clutch member 4 and the output end rotating shaft 2 are manually driven to rotate.

It should be noted that, in this embodiment, a specific structure of the transmission assembly 63 is not limited, as long as the above motion transmission can be realized, and those skilled in the art can refer to the prior art, and details are not described herein.

Further, considering the implementation of the axial movement of second half clutch 4 to engage with first half clutch 3, on the basis of the above-described embodiment, the force application means further comprises an elastic member 64 for driving second half clutch 4 into engagement with first half clutch 3 after the external force applied to second half clutch 4 by output fork 62 is removed.

That is, the present embodiment employs the elastic member 64 to urge the second clutch half 4 to return to the engagement with the first clutch half 3, and preferably, the elastic member 64 is a spring. As shown in fig. 1 and 2, a first retainer ring is disposed on an outer periphery of the second clutch half 4, a second retainer ring is disposed on the output shaft 2, a spring is sleeved on an outer periphery of the spline housing 51 of the rolling spline pair, one end of the spring abuts against the first retainer ring, and the other end of the spring abuts against the second retainer ring. When the second clutch half 4 rotates synchronously with the output shaft 2, the spring rotates along with it.

In order to manually rotate the second clutch half 4 when an external force is applied to the second clutch half 4 by the output fork 62, it is preferable that an outer ring of the end cover bearing is provided on an outer circumferential portion of the second clutch half 4 so as to be in contact with the output fork 62, and an inner ring of the end cover bearing is rotatable together with the second clutch half 4. That is, when the output shift fork 62 exerts external force on the outer ring of the end cover bearing, under the action of friction force between the output shift fork 62 and the outer ring of the end cover bearing, the outer ring of the end cover bearing can be ensured to be stationary, at this moment, the second half clutch member 4 is manually pushed to rotate, the inner ring of the end cover bearing can be enabled to rotate along with the second half clutch member 4, and the smoothness of manual rotation of the second half clutch member 4 under the condition that the output shift fork 62 exerts external force on the second half clutch member is ensured.

Further, in order to obtain the rotation angle of the output shaft 2 in real time so as to feed back the withdrawal position information of the ultrasonic catheter, on the basis of the above-mentioned embodiments, the outer peripheral portion of the output shaft 2 is provided with the code wheel 71, and the code wheel rotation angle detector 72 for detecting the rotation angle of the code wheel 71 is further included, so that the rotation angle of the code wheel 71 is detected in real time by the code wheel rotation angle detector 72, and thus the withdrawal distance of the ultrasonic catheter can be calculated in combination with the transmission ratio based on the detection information of the code wheel rotation angle detector 72, so as to feed back the withdrawal position information of the ultrasonic catheter in real time.

In each of the embodiments described above, the power mechanism 1 and the biasing device are provided on the bracket 9 as shown in fig. 1, in view of the convenience of the arrangement of the power mechanism 1 and the biasing device, so as to ensure the relative positional relationship between the first clutch half 3 and the second clutch half 4 and facilitate the application of the external force to the second clutch half 4.

In the above embodiments, the specific structure of the power mechanism 1 is not limited as long as it can output the rotational power. As a preferable scheme, as shown in fig. 1, the power mechanism 1 includes a micro motor 11, a primary synchronous pulley 12 connected to an output shaft of the micro motor 11, a secondary synchronous pulley 14 drivingly connected to the primary synchronous pulley 12 through a synchronous belt 13, and a transmission shaft for installing the secondary synchronous pulley 14, and the first half clutch 3 is connected to the transmission shaft.

In addition, in each of the above embodiments, preferably, the output end rotating shaft 2 is provided with a gear 8 to engage with the rack on the base for transmission, so that when the output end rotating shaft 2 rotates, the output end rotating shaft 2 drives the bracket 9 and the ultrasonic catheter to move relative to the base, that is, the rotation of the output end rotating shaft 2 is converted into the retraction movement of the ultrasonic catheter through the gear 8 engaging with the rack on the base.

In addition to the ultrasound catheter retraction device, the present invention also provides an intravascular ultrasound imaging system including the ultrasound catheter retraction device disclosed in the above embodiments, and the structures of other parts of the intravascular ultrasound imaging system are referred to in the prior art and are not described herein again.

That is, the intravascular ultrasound imaging system is characterized in that: the ultrasonic catheter retraction device disclosed in any one of the above embodiments is used. Because the ultrasonic catheter withdrawing device enables the second half clutch 4 to axially move relative to the output end rotating shaft 2 and enables the second half clutch 4 and the output end rotating shaft 2 to have circumferential spacing, the combination or separation movement of the second half clutch 4 and the first half clutch 3 and the synchronous rotation of the second half clutch 4 and the output end rotating shaft 2 are realized; compare in conventional supersound pipe withdrawal device among the prior art, avoid designing second half clutch 4 and output shaft 2 formula structure as an organic whole, can solve manufacturing and assemble inconvenient scheduling problem, avoid because of the withdrawal precision low grade that machining dimension error and assembly error lead to, consequently, can promote the withdrawal precision of intravascular ultrasound imaging system's supersound pipe. In addition, compared with the mode that the second half clutch 4 and the output end rotating shaft 2 are designed into an integral structural member, the second half clutch 4 can axially move relative to the output end rotating shaft 2, and the load of the second half clutch 4 and the first half clutch 3 during separation and combination is reduced, so that the ultrasonic catheter withdrawing device can also save the driving force for separating and combining the second half clutch 4 and the first half clutch 3. Further, the ultrasonic catheter withdrawing device has good universality.

It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The ultrasonic catheter retraction device and the intravascular ultrasound imaging system provided by the utility model are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (11)

1. An ultrasonic catheter retraction device, comprising:

a power mechanism (1) for outputting rotational power;

the output end rotating shaft (2) is movably connected with the fixed base so as to drive the ultrasonic catheter on the bracket (9) rotationally connected with the output end rotating shaft (2) to move relative to the base when the output end rotating shaft (2) rotates;

the first half clutch piece (3) is connected with the output end of the power mechanism (1);

a second clutch half (4) axially movable with respect to the output shaft (2) and engaging with or disengaging from the first clutch half (3); and a circumferential limit is arranged between the second half clutch (4) and the output end rotating shaft (2), so that the second half clutch (4) and the output end rotating shaft (2) can synchronously rotate.

2. The ultrasonic catheter retraction device according to claim 1, wherein the second clutch half (4) is connected to the output shaft (2) by a spline pair.

3. The ultrasound catheter retraction device according to claim 2, wherein said spline pair is a rolling spline pair, said second clutch half (4) is connected to a spline housing (51) of said rolling spline pair, and said output shaft (2) is connected to a spline shaft (52) of said rolling spline pair.

4. The ultrasonic catheter retraction device according to claim 3, wherein the second clutch half (4) is connected to the splined hub (51) by a fastener.

5. The ultrasound catheter retraction device according to claim 3, wherein said output end shaft (2) is threadedly connected to said splined shaft (52).

6. The ultrasound catheter retraction device according to claim 5, further comprising a jackscrew for locking the output shaft (2) with the spline shaft (52).

7. The ultrasound catheter retraction device according to claim 1, wherein the second clutch half (4) is connected to the output shaft (2) by a linear bearing.

8. The ultrasonic catheter retraction device according to any of claims 1 to 7, further comprising a force applying means for applying an external force to the second clutch half (4) to axially displace the second clutch half (4) relative to the output shaft (2).

9. The ultrasonic catheter retraction device according to claim 8, wherein said force applying means comprises:

an input swing lever (61) for swinging manually;

an output fork (62) for applying an external force to the second clutch half (4) to move the second clutch half (4) away from the first clutch half (3);

and the transmission assembly (63) is connected between the input swing rod (61) and the output shifting fork (62), the input swing rod (61), the transmission assembly (63) and the output shifting fork (62) form a link mechanism, so that when manual force is applied to the input swing rod (61), the output shifting fork (62) applies external force to the second half clutch piece (4).

10. The ultrasonic catheter retraction device according to claim 9, wherein said force applying means further comprises a resilient member (64) for driving said second clutch half (4) into engagement with said first clutch half (3) upon removal of the external force applied to said second clutch half (4) by said output fork (62).

11. An intravascular ultrasound imaging system comprising an ultrasound catheter retraction device, wherein the ultrasound catheter retraction device is an ultrasound catheter retraction device according to any of claims 1-10.

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