CN116328172B

CN116328172B - Coaxial catheter interface device

Info

Publication number: CN116328172B
Application number: CN202310637037.4A
Authority: CN
Inventors: 谢小祥; 梁争争
Original assignee: Shanghai Bodong Medical Technology Co ltd; Suzhou Bodong Rongying Medical Technology Co ltd
Current assignee: Shanghai Bodong Medical Technology Co ltd; Suzhou Bodong Rongying Medical Technology Co ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-08-29
Anticipated expiration: 2043-06-01
Also published as: CN116328172A

Abstract

The invention relates to the technical field of medical appliances and discloses a coaxial catheter interface device. The coaxial catheter interface device comprises a catheter connector, a catheter plugging part and a locking mechanism, wherein the catheter connector comprises a catheter shell and a coaxial connector plug coaxially and rotatably arranged in the catheter shell; the catheter plug-in part comprises a fixed sleeve and a rotating shaft coaxially and rotatably arranged in the fixed sleeve, a coaxial connector socket is arranged in an inner hole of the rotating shaft, and the catheter shell can be coaxially plugged in the fixed sleeve so that a coaxial connector plug can be plugged in the coaxial connector socket; the locking mechanism is arranged on the fixed sleeve and is configured to lock the catheter housing in the fixed sleeve, so that the catheter housing is connected with the fixed sleeve more reliably. The catheter housing and the fixed sleeve are matched in a completely coaxial mode, and a user only needs to push and pull the catheter housing again by manually pushing and pressing the locking mechanism axially, so that the catheter housing and the fixed sleeve can be disassembled and assembled, and the convenience of operation is improved.

Description

Coaxial catheter interface device

Technical Field

The invention relates to the technical field of medical instruments, in particular to a coaxial catheter interface device.

Background

Intravascular ultrasound (IVUS) is an emerging technique for clinical diagnosis and interventional therapy of coronary heart disease. The miniature ultrasonic transducer is sent into the cardiovascular cavity of the human body through the interventional catheter to emit ultrasonic waves and collect echoes, and the sectional morphology, blood flow information and the like of the blood vessel are displayed in real time after signal processing, so that diagnosis and treatment of vascular lesions are assisted.

The intravascular ultrasound catheter is used as a disposable consumable, and is usually matched with an external driving device to be used, so that the ultrasound transducer in the catheter rotates and linearly moves according to specific requirements to drive the ultrasound transducer to acquire image information of a target blood vessel segment, and the catheter is connected with the driving device through a catheter interface device.

The catheter interface device on the market at present adopts non-coaxial type design, and the structure is complicated, and the locking direction of catheter interface and unlocking direction distribute in different positions, need both hands operation and just can accomplish loading and unloading according to specific position and order operation, and the operation is inconvenient. And the locking and unlocking states are not easy to identify, and the catheter or the driving device is easy to damage due to misoperation in the use process, so that the use experience of a user is directly affected.

Accordingly, there is a need to provide a coaxial catheter interface device that addresses the above-described issues.

Disclosure of Invention

The invention aims to provide the coaxial catheter interface device, which can be used for completing the disassembly and assembly between the catheter shell and the fixed sleeve through the push-pull action, so that the convenience of operation is improved, and the use experience of a user is improved.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a coaxial catheter interface device comprising:

the catheter connector comprises a catheter shell and a coaxial connector plug coaxially and rotatably arranged in the catheter shell;

the catheter plug-in part comprises a fixed sleeve and a rotating shaft coaxially and rotatably arranged in the fixed sleeve, a coaxial connector socket is arranged in an inner hole of the rotating shaft, and the catheter shell can be coaxially plugged in the fixed sleeve so as to enable the coaxial connector plug to be plugged on the coaxial connector socket and enable the coaxial connector plug and the coaxial connector socket to synchronously start and stop rotating or axially moving;

and a locking mechanism axially slidably disposed on the fixed sleeve, the locking mechanism configured to axially lock the catheter housing within the fixed sleeve.

As an alternative, the locking mechanism includes:

the limiting sleeve is sleeved outside the fixed sleeve in a sliding manner;

One end of the elastic piece is connected or abutted to the end face of the limit sleeve, and the other end of the elastic piece is connected or abutted to the end face of the fixed sleeve;

the ball, set up the accommodation hole on the fixed sleeve's the lateral wall, the ball is located the accommodation hole, the annular recess has been seted up along the axial on the lateral wall of pipe casing with the position that the accommodation hole corresponds, the ball can the part hold in the recess, limit sleeve can follow fixed sleeve's axial displacement, in order will the ball locking or unblock in the recess.

As an alternative, the number of the accommodation holes is at least two, at least two accommodation holes are uniformly distributed along the circumferential direction of the fixing sleeve, and the balls are arranged in each accommodation hole.

As an alternative scheme, the outer wall of the fixed sleeve is convexly provided with a limiting piece, the limiting piece is located at one side close to the catheter housing, and the limiting sleeve can be abutted to the limiting piece so as to limit the limiting sleeve to be separated from the fixed sleeve along the axial direction.

As an alternative scheme, the outer wall of the catheter housing is annularly provided with a vibration damping ring, the vibration damping ring is respectively coaxially arranged with the catheter housing and the fixed sleeve, and after the catheter housing is completely inserted into the fixed sleeve, the vibration damping ring is in interference fit with the inner wall of the fixed sleeve.

As an alternative, the vibration damping ring includes a cylindrical portion and a tapered portion connected, the tapered portion is located near one side of the fixing sleeve, and an outer wall of the cylindrical portion is in interference fit with an inner wall of the fixing sleeve.

As an alternative scheme, a rotary cylinder is coaxially arranged in the catheter shell in a rotating way, and the coaxial connector plug is fixedly inserted into the rotary cylinder in a plugging way;

the rotary shaft is close to one end of the rotary cylinder body and is provided with a limiting groove, the limiting groove penetrates through one end of the rotary shaft and axially extends along the rotary shaft, the outer wall of the rotary cylinder body is provided with a limiting boss, and the limiting boss is in plug-in fit with the limiting groove.

As an alternative scheme, the opening end inner wall of rotation axis is provided with the helical surface, the helical surface is from outside to inside towards the bottom slope setting of hole, spacing boss is close to the tip of rotation axis is equipped with spherical terminal surface, spherical terminal surface with helical surface sliding fit.

As an alternative, the coaxial connector plug includes a plug outer conductor and a plug inner conductor coaxially disposed inside the plug outer conductor, a dielectric body is disposed between the plug inner conductor and the plug outer conductor, and a first jack is formed inside the plug inner conductor;

The coaxial connector socket comprises a socket outer conductor and a socket inner conductor coaxially arranged in the socket outer conductor, an insulating shell is wrapped outside the socket outer conductor, a second jack is formed between the socket outer conductor and the socket inner conductor, the socket inner conductor is inserted into the first jack, and the plug outer conductor is inserted into the second jack.

As an alternative, the plug outer conductor and the plug inner conductor are disposed in a gap with the dielectric body at least within a length of axial engagement with the coaxial connector receptacle;

the plug inner conductor is provided with a plurality of first long grooves which penetrate through one end of the plug inner conductor and axially extend along the first long grooves, the plug outer conductor is provided with a plurality of second long grooves which penetrate through one end of the plug outer conductor and axially extend beyond the length axially matched with the coaxial connector socket.

The beneficial effects of the invention are as follows:

according to the coaxial catheter interface device provided by the invention, the catheter shell is inserted into the fixed sleeve, so that the coaxial connector plug is inserted into the coaxial connector socket and can be synchronously started and stopped to rotate or axially move, and stable signal transmission and power transmission are realized. The catheter casing and the fixed sleeve are matched in a completely coaxial mode, a user only needs to push and pull the catheter casing again by manually pushing and pressing the locking mechanism, disassembly and assembly between the catheter casing and the fixed sleeve are completed, operation convenience is improved, user experience is improved, locking and unlocking are achieved without distinguishing the circumferential directions intentionally when the user pulls out and inserts, and single-hand operation is supported. The locking mechanism is arranged on the fixed sleeve, and the locking mechanism is configured to lock the catheter housing in the fixed sleeve, so that the catheter housing can be limited to move in the axial direction and the radial direction, the catheter housing is more stable and reliable to be connected with the fixed sleeve, and the unstable transmission signal caused by shaking of the catheter housing is avoided.

Drawings

For a more obvious and understandable description of embodiments of the invention or solutions according to the prior art, reference will be made to the accompanying drawings, which are used in the description of the embodiments or the prior art and which are examples of the invention, and from which other drawings can be obtained without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a coaxial catheter interface device according to an embodiment of the present invention;

FIG. 2 is an exploded view of a locking mechanism and a stationary sleeve provided by an embodiment of the present invention;

FIG. 3 is an axial cross-sectional view of a coaxial catheter interface device provided in an embodiment of the invention in a first operational state;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is an axial cross-sectional view of a coaxial catheter interface device provided in an embodiment of the invention in a second operational state;

FIG. 6 is a partial enlarged view at B in FIG. 5;

FIG. 7 is an enlarged view of a portion of FIG. 5 at C;

FIG. 8 is an axial cross-sectional view of a coaxial catheter interface device provided in an embodiment of the invention in a third operational state;

fig. 9 is a partial enlarged view at D in fig. 8;

FIG. 10 is a schematic view of a structure of a rotary shaft according to an embodiment of the present invention;

Fig. 11 is a schematic diagram of the mating of the rotary cylinder and the coaxial connector plug according to an embodiment of the present invention;

FIG. 12 is an enlarged view of a portion of FIG. 11 at E;

FIG. 13 is a schematic diagram illustrating the cooperation between a rotary cylinder and a rotary shaft in a first state according to an embodiment of the present invention;

fig. 14 is a partial enlarged view at F in fig. 13;

FIG. 15 is a schematic diagram illustrating the cooperation between a rotary cylinder and a rotary shaft in a second state according to an embodiment of the present invention;

fig. 16 is a partial enlarged view at G in fig. 15;

FIG. 17 is an axial cross-sectional view of FIG. 13;

fig. 18 is a partial enlarged view at H in fig. 17;

FIG. 19 is an axial cross-sectional view of a rotary shaft provided by an embodiment of the present invention;

FIG. 20 is an enlarged view of a portion of FIG. 19 at I;

fig. 21 is a schematic structural view of a coaxial connector socket according to an embodiment of the present invention.

In the figure:

1. a conduit joint; 11. a catheter housing; 111. a groove; 12. a coaxial connector plug; 121. a plug outer conductor; 122. a plug inner conductor; 123. a mediator; 124. a first jack; 125. a first elongated slot; 126. a second elongated slot; 13. rotating the cylinder; 131. a limit boss; 132. a spherical end face; 133. a conical inclined surface; 14. a vibration damping ring; 141. a cylindrical portion; 142. a tapered portion; 15. a catheter handle;

2. A catheter insertion section; 21. a fixed sleeve; 211. a receiving hole; 212. a receiving chamber; 22. a rotation shaft; 221. an inner bore; 222. a limit groove; 223. a helical surface; 23. a coaxial connector receptacle; 231. a socket outer conductor; 232. a socket inner conductor; 233. a second jack; 234. the end face of the socket shaft; 235. an insulating housing; 24. a bearing seat; 25. a front end bearing; 26. a rear end bearing;

3. a locking mechanism; 31. a limit sleeve; 311. an avoidance groove; 312. a receiving chamber; 32. an elastic member; 33. a ball; 34. and a limiting piece.

Detailed Description

The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.

In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1, the present embodiment provides a coaxial catheter interface device for connecting an ultrasound catheter with a driving device of a retracting unit, wherein the driving device provides power for movement, and the movement mode includes rotation movement along the circumferential direction of the ultrasound catheter and retracting movement along the axial direction. The ultrasonic catheter is internally provided with the ultrasonic transducer, the sectional view of the lumen at the current position of the ultrasonic transducer can be checked through rotary motion, if the ultrasonic transducer is retracted while rotating, a series of sectional views on the retraction path can be obtained, the ultrasonic information in the whole lumen on the retraction path can be obtained by splicing the series of sectional views, and the ultrasonic transducer can be used together with the retraction path through rotation or respectively.

Specifically, as shown in fig. 1 to 3, the coaxial catheter interface device includes a catheter adapter 1, a catheter hub 2, and a locking mechanism 3. The catheter adapter 1 comprises a catheter housing 11 and a coaxial connector plug 12 coaxially and rotatably arranged in the catheter housing 11, wherein one end of the catheter housing 11 is opened, the other end of the catheter housing is connected with a catheter handle 15, and the catheter handle 15 is used for connecting an ultrasonic catheter. The catheter plug-in part 2 comprises a fixed sleeve 21 and a rotating shaft 22 coaxially arranged in the fixed sleeve 21 in a rotating way, one end of the fixed sleeve 21 is opened, a containing cavity 212 for containing the rotating shaft 22 is formed inside the fixed sleeve, the rotating shaft 22 is connected to the output end of the driving device to drive the rotating shaft 22 to rotate, an inner hole 221 is formed in one end of the rotating shaft 22, a coaxial connector socket 23 is arranged inside the inner hole 221, the catheter shell 11 can be coaxially plugged in the fixed sleeve 21, so that the coaxial connector plug 12 is plugged on the coaxial connector socket 23, and the coaxial connector plug and the rotating shaft are synchronously started and stopped or axially moved. The locking mechanism 3 is axially slidably provided on the fixing sleeve 21, and the locking mechanism 3 is configured to axially lock the catheter housing 11 within the fixing sleeve 21. The catheter connector 1 and the connected ultrasonic catheter are disposable consumables, and each time the ultrasonic catheter needs to be replaced by a new one, but the same catheter connector 1 and the ultrasonic catheter can be used repeatedly in the same patient, and the catheter plugging part 2 and the locking mechanism 3 thereon are always arranged on a bracket of a retracting unit and can be reused. When in use, the fixed sleeve 21, the catheter housing 11 and the catheter handle 15 are not rotated, but the whole catheter handle can be driven by the driving device to carry out retracting movement, the driving device drives the rotating shaft 22 to rotate, and the rotating shaft 22 drives the coaxial connector socket 23 and the coaxial connector plug 12 to synchronously rotate, so that the ultrasonic transducer connected with the rotating shaft is driven to rotate.

The coaxial catheter interface device provided in this embodiment enables the coaxial connector plug 12 to be plugged on the coaxial connector socket 23 and to keep synchronous start-stop rotation or axial movement by coaxially plugging the catheter housing 11 in the fixing sleeve 21, so as to realize stable signal transmission and power transmission. The catheter housing 11 and the fixed sleeve 21 are matched in a completely coaxial mode, a user only needs to manually push the locking mechanism axially and then plug the catheter housing 11, disassembly and assembly between the catheter housing 11 and the fixed sleeve 21 can be completed, operation convenience is improved, user experience is improved, locking and unlocking are achieved without distinguishing the circumferential direction deliberately when the user plugs, and single-hand operation is supported. The locking mechanism 3 can limit the movement of the catheter housing 11 in the axial direction and the radial direction, so that the catheter housing 11 is connected with the fixed sleeve 21 more stably and reliably, and the unstable transmission signal caused by shaking of the catheter housing 11 and the fixed sleeve 21 is avoided.

Referring to fig. 3, the rotary shaft 22 is formed with different shaft diameters, and the shaft diameter of a part of the rotary shaft 22 connected to the output end of the driving device is small, and the shaft diameter of the other part of the rotary shaft 22 is large because the inner hole 221 is formed. The outer diameter of the catheter housing 11 is in smaller clearance fit with the inner diameter of the fixing sleeve 21 to ensure good coaxiality between the coaxial connector plug 12 and the coaxial connector socket 23, and the inner diameter of the catheter housing 11 is in larger clearance fit with the outer diameter of a part of the rotating shaft 22 with a larger shaft diameter to avoid generating motion friction with the inner wall of the catheter housing 11 when the rotating shaft 22 rotates. The bearing pedestal 24 is sleeved outside the rotating shaft 22, and the bearing pedestal 24 is fixedly connected with the fixed sleeve 21. For facilitating smooth rotation, a front end bearing 25 and a rear end bearing 26 are arranged between the rotating shaft 22 and the fixed sleeve 21, an outer ring of the front end bearing 25 is fixedly connected with the bearing seat 24, an inner ring is fixedly connected with a part with a larger shaft diameter of the rotating shaft 22, an outer ring of the rear end bearing 26 is fixedly connected with the bearing seat 24, and an inner ring is fixedly connected with a part with a smaller shaft diameter of the rotating shaft 22.

Specifically, as shown in fig. 2 and 3, the locking mechanism 3 includes a limit sleeve 31, an elastic member 32 and a ball 33, the limit sleeve 31 is slidably sleeved outside the fixed sleeve 21, one end of the elastic member 32 is connected or abutted to an end surface of the limit sleeve 31, the other end is connected or abutted to an end surface of the fixed sleeve 21, a receiving hole 211 is formed in a side wall of the fixed sleeve 21, the ball 33 is located in the receiving hole 211, an annular groove 111 is formed in a position on the side wall of the limit sleeve 31 corresponding to the receiving hole 211 in an axial direction, the ball 33 can be partially accommodated in the groove 111, and the limit sleeve 31 can move in an axial direction of the fixed sleeve 21 so as to lock or unlock the ball 33 in the groove 111. Wherein the elastic member 32 is preferably a spring.

By way of example, the process of locking and unlocking the catheter housing 11 with the fixing sleeve 21 will be described below with reference to fig. 3 to 9. Fig. 3 is a schematic view of the catheter housing when the catheter housing starts to be inserted into the fixed sleeve, referring to fig. 3 and 4, first, the limiting sleeve 31 is manually pushed to the right so that the balls 33 have a moving space along the radial direction of the limiting sleeve 31, at this time, the elastic member 32 is in a compressed state, then the catheter housing 11 is pushed to the right, the balls 33 move along the radial direction of the limiting sleeve 31 away from the axial direction due to the extrusion of the inclined surface of the end portion of the catheter housing 11, and the catheter housing 11 is pushed until the balls 33 completely move to the outer surface of the catheter housing 11, at this time, the limiting sleeve 31 can be released, the catheter housing 11 can still be freely inserted and pulled along the axial direction, and the balls 33 roll only in the accommodating holes 211. Fig. 5 is a schematic view of the catheter housing fully inserted into the fixing sleeve, referring to fig. 5 and 6, after the catheter housing 11 is pushed to align the groove 111 with the accommodating hole 211, the limit sleeve 31 is pushed to the left by the elastic member 32, so as to press the ball 33 to move toward the axis, part of the ball 33 falls into the groove 111, and meanwhile, the inner wall of the limit sleeve 31 and the upper end surface of the ball 33 form a tiny clearance fit, so that the ball 33 is locked in the groove 111 and cannot move along the radial direction or the axial direction of the limit sleeve 31 any more, thereby reliably connecting the catheter housing 11 and the fixing sleeve 21 and limiting the movement of the catheter housing 11 in the axial direction and the radial direction. Fig. 8 is a schematic view of the catheter housing beginning to be pulled out from the fixed sleeve, referring to fig. 8 and 9, when the catheter housing 11 needs to be pulled out from the fixed sleeve 21, the limit sleeve 31 is pushed to the right first, so that the balls 33 have a space for avoiding the space along the radial direction of the limit sleeve 31, then the catheter housing 11 is pulled to the left, the balls 33 move away from the axial direction along the radial direction of the limit sleeve 31 due to the extrusion of the inclined surface of the end part of the groove 111, so that the balls 33 are separated from the groove 111, and the catheter housing 11 is pulled continuously until the balls are completely separated from the fixed sleeve 21. Wherein, through setting the tip of recess 111 to the inclined plane for the sphere of ball 33 can roll the cooperation with the inclined plane of recess 111, under the direction of inclined plane, can more conveniently extrude ball 33 out from recess 111, thereby reach laborsaving purpose. Because the axial travel required by the limiting sleeve 31 is small, and the limiting sleeve is not required to be kept all the time after being pushed, the insertion and extraction actions can be completed by matching the fingers and the palm of one hand, so that the one-hand operation is realized.

Through setting up above-mentioned locking mechanism 3 for pipe casing 11 and fixed sleeve 21 can adopt the cooperation of complete coaxial mode, and the user only need manual along axial bulldozing spacing sleeve 31 and pull out plug pipe casing 11, just can realize coaxial locking and unblock with pipe casing 11 and fixed sleeve 21, has improved the convenience of operation, need not to distinguish the circumferencial direction deliberately when the user pulls out the plug and realizes locking and unlocking, and is difficult for leading to the part impaired because of the maloperation in the use, has promoted user experience.

Preferably, as shown in fig. 4, a small-section avoidance groove 311 is formed at the end of the limit sleeve 31, when the catheter housing 11 is just inserted into the fixed sleeve 21, the limit sleeve 31 needs to be pushed rightward first until the avoidance groove 311 is opposite to the balls 33 (as shown in fig. 4), at this time, the balls 33 can be in a movable state along the radial direction of the limit sleeve 31, and the space of the avoidance groove 311 can avoid the balls 33, and meanwhile, the balls 33 can be prevented from completely separating from the accommodating hole 211, so as to play a role in limiting excessive radial movement of the balls 33.

Preferably, as shown in fig. 1, a plurality of axial arrows are carved on the outer surface of the limiting sleeve 31, so that a user can be prompted about the force application direction of manual pressing during installation, and preferably, the maximum pressing stroke of the limiting sleeve 31 does not exceed 5mm, so that one-hand operation is facilitated, and the use experience of the user is improved.

In the present embodiment, as shown in fig. 2, the number of the accommodation holes 211 is at least two, the at least two accommodation holes 211 are uniformly distributed along the circumferential direction of the fixing sleeve 21, and the balls 33 are provided in each accommodation hole 211, and correspondingly, the annular groove 111 can be engaged with a plurality of balls 33 at the same time, thereby improving the reliability of the locking connection of the catheter housing 11 and the fixing sleeve 21. Preferably, the number of the receiving holes 211 is set to an even number and uniformly distributed in the circumferential direction of the fixing sleeve 21 to ensure good coaxiality of the catheter housing 11 and the fixing sleeve 21. When the number of the receiving holes 211 is two, it is preferable to arrange symmetrically in the vertical direction, and when the catheter housing 11 is inserted into the fixing sleeve 21, the lower ball 33 provides reliable support for the catheter housing 11 against its gravity, thereby facilitating the maintenance of the coaxiality, and when the catheter housing 11 needs to be pulled out of the fixing sleeve 21, after the limit sleeve 31 is moved to the unlocking position, the lower ball 33 can be automatically separated from the groove 111 under the action of the gravity, and only a small pulling force is required for the upper ball 33 to eject it from the groove 111. Therefore, the mode of arranging up and down is more beneficial to maintaining the position precision and saves more labor compared with the mode of arranging left and right.

Further, as shown in fig. 6, the outer wall of the fixing sleeve 21 is convexly provided with a limiting member 34, the limiting member 34 is located at one side close to the catheter housing 11, and the limiting sleeve 31 can be abutted against the limiting member 34 to limit the limiting sleeve 31 from being separated from the fixing sleeve 21 along the axial direction. When the catheter housing 11 is completely inserted into the fixing sleeve 21, the limiting sleeve 31 is pushed leftward by the elastic member 32 until the stepped surface of the avoidance groove 311 is blocked by the limiting member 34 (as shown in fig. 6), and at this time, the limiting sleeve 31 cannot move further in the axial direction, thereby playing a limiting role. Meanwhile, the setting position of the limiting piece 34 can also be used as an indication function, as shown in fig. 6, namely, when the step surface of the avoidance groove 311 is abutted against the limiting piece 34 and cannot move, the limiting sleeve 31 is positioned at the position of the locking ball 33, at the moment, the catheter housing 11 and the fixed sleeve 21 are in a locking state, and the outer circumferential surface of the limiting piece 34 is completely covered by the limiting sleeve 21 and cannot be seen; as shown in fig. 9, when the limiting sleeve 31 is pushed to expose the limiting member 34 completely, the limiting sleeve 31 is at the position of unlocking the ball 33, and at this time, the catheter housing 11 and the fixing sleeve 21 are in an unlocked state, so that the user can visually determine the unlocked state according to the state, thereby further improving the convenience of operation and improving the use experience of the user.

Further, as shown in fig. 3, a stepped surface is machined on the inner wall of the limit sleeve 31, a stepped surface is machined on the outer wall of the fixed sleeve 21, when the limit sleeve 31 is sleeved outside the fixed sleeve 21, a containing cavity 312 is formed between the limit sleeve 31 and the fixed sleeve 21, the elastic piece 32 is located in the containing cavity 312, one end of the elastic piece 32 only needs to be abutted on the stepped surface of the limit sleeve 31, the other end of the elastic piece 32 abuts on the stepped surface of the fixed sleeve 21, and installation of the elastic piece 32 is facilitated. The circumferential rotation of the elastic member 32 does not affect its function and is therefore not limiting.

Further, as shown in fig. 3, a damping ring 14 is disposed on an outer wall of one end of the catheter housing 11 far away from the fixed sleeve 21, the damping ring 14 is disposed coaxially with the catheter housing 11 and the fixed sleeve 21, respectively, and after the catheter housing 11 is completely inserted into the fixed sleeve 21, the damping ring 14 is in interference fit with an inner wall of the fixed sleeve 21. With the above structure, on the one hand, the insertion of the catheter housing 11 and the fixing sleeve 21 is more compact, and on the other hand, vibration energy can be absorbed through the vibration-absorbing ring 14, thereby providing vibration-absorbing effect and reducing noise. In the present embodiment, the damper ring 14 is made of a soft elastic material such as silicone rubber, or the like.

Specifically, as shown in fig. 6, the vibration damping ring 14 includes a cylindrical portion 141 and a tapered portion 142 connected, the tapered portion 142 being located on a side close to the fixing sleeve 21, an outer wall of the cylindrical portion 141 being interference-fitted with an inner wall of the fixing sleeve 21. The conical portion 142 can be more conveniently inserted into the accommodating cavity 212 of the fixed sleeve 21, and the cylindrical portion 141 forms a small amount of interference fit with the inner wall of the fixed sleeve 21, so as to absorb radial shake generated by rotational movement, and simultaneously form stable and coaxial support with the ball 33 on the catheter housing 11, thereby improving the coaxiality of the catheter adapter 1 and the catheter insertion portion 2.

Further, as shown in fig. 3 and 11, a rotary cylinder 13 is coaxially rotatably disposed in the catheter housing 11, the coaxial connector plug 12 is inserted and fixed in the rotary cylinder 13, the rotary cylinder 13 is inserted and matched with an inner hole 221 of the rotary shaft 22, and after insertion, a slight clearance fit is formed between the outer diameter of the rotary cylinder 13 and the inner hole 221 of the rotary shaft 22, so as to improve the coaxiality between the coaxial connector plug 12 and the coaxial connector socket 23. Referring to fig. 7, 11 and 21, after the catheter housing 11 is completely inserted into the fixing sleeve 21, the end surface of the rotary cylinder 13 is fitted to the socket shaft end surface 234 of the coaxial connector socket 23.

Specifically, as shown in fig. 10 and 11, in order to coaxially rotate the rotation shaft 22 and the rotation cylinder 13, a limit groove 222 is formed at one end of the rotation shaft 22 near the rotation cylinder 13, the limit groove 222 penetrates through one end of the rotation shaft 22 and extends along the axial direction of the rotation shaft 22, the penetration not only means that the limit groove 222 penetrates through the side wall of the rotation shaft 22 along the radial direction, but also penetrates through the end of the rotation shaft 22 along the axial direction, a limit boss 131 is disposed on the outer wall of the rotation cylinder 13, when the catheter housing 11 is inserted into the fixed sleeve 21, the rotation cylinder 13 is also inserted into the inner hole 221 of the rotation shaft 22, and in the insertion process, the limit boss 131 on the rotation cylinder 13 can be inserted into the limit groove 222 of the rotation shaft 22, so that limit fit is formed between the limit groove 222 and the limit boss 131, and rotation torque is transmitted through the contact surface of the limit groove 222 and the limit boss 131 to perform coaxial rotation.

Preferably, the spacing boss 131 and the spacing groove 222 are in a tiny clearance fit along the width direction so as to reduce the inertia impact during the start and stop of rotation, and the spacing boss 131 and the spacing groove 222 are in a larger interference fit along the radial direction, but the spacing boss 131 must not exceed the outer surface of the spacing groove 222 so as to ensure enough structural strength to perform rotation driving or rotation braking without generating motion interference.

Further, as shown in fig. 10, two limiting grooves 222 are provided, and as shown in fig. 11, two limiting bosses 131 are provided correspondingly, two limiting bosses 131 are provided oppositely, and each limiting boss 131 can be in plug-in fit with the corresponding limiting groove 222. Through adopting above-mentioned setting for the coaxial rotation of rotatory barrel 13 and rotation axis 22 after the plug-in components fit both is more reliable and stable, and the moment transmission is more stable even. Of course, in other embodiments, the limiting boss 131 and the limiting groove 222 may be configured in three or more uniformly distributed manners, and may be flexibly configured according to actual requirements, which is not limited herein.

Further, as shown in fig. 10 and 11, the inner wall of the opening end of the rotation shaft 22 is provided with an inclined spiral surface 223, the inclined spiral surface 223 is inclined from outside to inside toward the bottom of the inner hole 221 of the rotation shaft 22, the end of the limiting boss 131, which is close to the rotation shaft 22, is provided with a spherical end surface 132, and the spherical end surface 132 is in sliding fit with the inclined spiral surface 223. In this embodiment, four helical surfaces 223 are preferably provided, and the four helical surfaces 223 are symmetrically disposed in pairs along the longitudinal axis of the rotation shaft 22, and each side of the middle plane has two helical surfaces 223 with a middle plane of the two limiting grooves 222 as a symmetry plane, the two helical surfaces 223 on each side are opposite in rotation direction, and the two helical surfaces 223 on each side are connected to form an outwardly convex tip. The middle plane of the two limiting grooves 222 is a plane formed by the middle connecting line of the two limiting grooves 222 along the axial direction. In other embodiments, two inclined spiral surfaces 223 may be provided, and two inclined spiral surfaces 223 may be provided on two sides of the connecting line of the two limiting grooves 222, which is flexibly set according to the requirement, and the present invention is not limited in particular.

It will be appreciated that since the rotary cylinder 13 and the rotary shaft 22 are inside the catheter housing 11 and the fixed sleeve 21, respectively, the positions of the rotary cylinder 13 and the rotary shaft 22 cannot be visually located when being plugged, and thus the radial relative positions between the rotary cylinder 13 and the rotary shaft 22 are random before plugging. The mating of the helical surface 223 and the spherical end surface 132 ensures that the stop boss 131 will eventually fall completely into the stop slot 222 regardless of the relative position of the two during insertion.

Specifically, referring to fig. 13 and 14, when the rotary cylinder 13 is pushed and pulled by the catheter housing 11 to move axially, when the rotary cylinder 13 is just inserted into the rotary shaft 22, and when the limit boss 131 and the limit groove 222 are not aligned completely, the spherical end face 132 of the end of the limit boss 131 can fall on the inclined spiral surface 223 completely, and as the rotary cylinder 13 pushes, the friction moment generated on the inclined spiral surface 223 can make the side with smaller rotation resistance moment rotate to avoid, because the bearing friction force is very small, the rotary shaft 22 rotates normally until the limit boss 131 is aligned with the center of the limit groove 222 exactly, as shown in fig. 15 and 16. At this time, the rotary cylinder 13 and the rotary shaft 22 do not rotate relatively, but only move in the axial direction, and the limiting boss 131 can be inserted into the limiting groove 222 by continuing to push the rotary cylinder 13.

Through the arrangement, the rotating shaft 22 can automatically rotate to correct the position, so that the limiting boss 131 is inserted into the limiting groove 222, the limiting groove 222 and the limiting boss 131 do not need to be manually aligned before the plugging, the rapid blind plugging is conveniently carried out from any position, and the plugging convenience is improved. And through setting up the quantity of helical surface 223 to four for rotation axis 22 just can insert spacing boss 131 in spacing groove 222 at most 90 degrees, and it is simpler and more simple to handle, and required promotion stroke is shorter, has improved grafting efficiency, and for the setting of two helical surfaces 223, can save axial space, makes rotation axis 22 can make littleer. In addition, through arcwall face transitional coupling between the surface of spherical terminal surface 132 and spacing boss 131, and through setting up the terminal surface of spacing boss 131 as spherical terminal surface 132, set up rotation axis 22's terminal surface as helical surface 223 simultaneously, it has and only has stable point contact to make between spacing boss 131 and the helical surface 223, be favorable to reducing sliding friction, make the screw in more smooth and easy and keep better structural strength, and can avoid the pointed end cooperation to cause the fish tail to rotation axis 22's terminal surface, reduce wearing and tearing.

Referring to fig. 19 and 20, in the present embodiment, the inclined spiral surface 223 is an inclined spiral surface formed along the axial direction of the rotation shaft 22, that is, the central axis of the rotation shaft 22 is used as a guide axis, the cylindrical spiral line on the inner hole 221 is used as a guide line, and the included angle α between two opposite pixel lines of the inclined spiral surface 223 is 60 ° to 120 °, preferably 90 °, and the guide angle α of the inclined spiral surface 223 is half, that is, 30 ° to 60 °, preferably 45 °, as seen along the axial section of the rotation shaft 22. By setting the guide angle of the inclined spiral surface 223 within the above range, the operation force at the time of insertion of the catheter housing 11 can be reduced to more labor-saving complete insertion of the rotary cylinder 13 into the rotary shaft 22. Specifically, the guiding angle of the inclined spiral surface 223 may be 30 °, 45 °, 50 ° or 60 °, and may be flexibly set according to the requirement.

Further, referring to fig. 20, the small end diameter D1 of the inclined spiral surface 223 is equal to the diameter of the inner hole 221 of the rotating shaft 22, and the large end diameter D2 of the inclined spiral surface 223 is not smaller than the maximum envelope circle diameter of the limiting boss 131, so that the spherical end surface 132 can completely fall on the inclined spiral surface 223 and can be more smoothly slidingly matched with the inclined spiral surface 223, and finally the limiting boss 131 can be smoothly inserted into the limiting groove 222, thereby preventing the jamming phenomenon.

Further, when the number of the inclined spiral surfaces 223 in the circumferential direction is four, the quarter lead of the inclined spiral surfaces 223 is not less than the maximum guide idle stroke LS between the coaxial connector plug 12 and the coaxial connector receptacle 23. Wherein, the state that the spherical end surface 132 of the limit boss 131 contacts with the tip formed by the helical surface 223 is defined as a first state, i.e. the state shown in fig. 14, the state that the limit boss 131 is aligned with the limit groove 222 is defined as a second state, i.e. the state shown in fig. 16, and when the limit boss 131 is switched from the first state to the second state, i.e. the rotation shaft 22 is rotated by 90 °, the axial distance taken by the limit boss 131 is one quarter of the lead of the helical surface 223, i.e. Hp/4 shown in fig. 20. The maximum guide idle stroke LS is determined by: the spherical end surface 132 of the limiting boss 131 is brought into contact with the tip end formed by the two inclined spiral surfaces 223, i.e., the first state shown in fig. 14, 17 and 18, when the distance between the end surface of the coaxial connector plug 12 and the end surface of the coaxial connector socket 23 is the maximum guide idle stroke LS, as shown in fig. 18.

It will be appreciated that during the process of plugging the rotary cylinder 13 into the rotary shaft 22, the rotary shaft 22 needs to be rotated, and if the coaxial connector plug 12 and the coaxial connector socket 23 are plugged and mated during this plugging process, the rotary shaft 22 may not be easily rotated due to the increased friction resistance, which increases the plugging difficulty. By adopting the above arrangement, even if the spherical end face 132 falls on the most disadvantageous position on the inclined spiral face 223, that is, the rotation of the rotation shaft 22 is required to the maximum stroke, it can be ensured that the coaxial connector plug 12 and the coaxial connector socket 23 are not touched all the time in the above rotation process, thereby ensuring that the rotation shaft 22 rotates more smoothly, and further ensuring that the insertion and extraction can be performed smoothly.

Preferably, as shown in fig. 11, the side wall of the end of the rotary cylinder 13 is provided as a tapered slope 133. The conical inclined surface 133 can ensure that the rotary cylinder 13 and the inclined spiral surface 223 are contacted by the spherical end surface 132 only, so that the end parts are prevented from forming multi-point contact in the plugging process to influence each other, the operation is more convenient, and the plugging difficulty is reduced.

Further, as shown in fig. 7, 11 and 21, the coaxial connector plug 12 includes a plug outer conductor 121 and a plug inner conductor 122 coaxially provided inside the plug outer conductor 121, and a dielectric body 123 is provided between the plug inner conductor 122 and the plug outer conductor 121 to insulate the plug inner conductor 122 from the plug outer conductor 121, and a first insertion hole 124 is formed inside the plug inner conductor 122. The coaxial connector receptacle 23 includes a receptacle outer conductor 231 and a receptacle inner conductor 232 coaxially disposed inside the receptacle outer conductor 231, an insulating housing 235 is wrapped outside the receptacle outer conductor 231, the insulating housing 235 is connected to the rotary shaft 22 by a pin, an insulator (not shown) is also provided between the receptacle outer conductor 231 and the receptacle outer conductor 231 to insulate the receptacle outer conductor 231 from the receptacle outer conductor 231, and a second insertion hole 233 is formed between the receptacle outer conductor 231 and the receptacle inner conductor 232. After the coaxial connector plug 12 is inserted into the coaxial connector receptacle 23, the end face of the rotary cylinder 13 is fitted to the receptacle shaft end face 234 (end face of the insulating housing 235), and the coaxial connector plug 12 is integrally enclosed in the insulating housing 235, wherein the receptacle inner conductor 232 is inserted into the first insertion hole 124, the outer surface of the receptacle inner conductor 232 is in contact with the inner surface of the plug inner conductor 122, thereby conducting the receptacle inner conductor 232 and the plug inner conductor 122, the plug outer conductor 121, the dielectric body 123 and the plug inner conductor 122 are inserted into the second insertion hole 233, and the outer surface of the plug outer conductor 121 is in contact with the inner surface of the receptacle outer conductor 231, thereby conducting the plug outer conductor 121 and the receptacle outer conductor 231, and finally achieving stable signal transmission.

Wherein the coaxial connector plug 12 is fixed on the rotary cylinder 13, and the accuracy of the coaxiality among the plug inner conductor 122, the plug outer conductor 121 and the rotary cylinder 13 is ensured through a manufacturing process. The plug inner conductor 122 and the plug outer conductor 121 are both in columnar thin-wall structures, and the end part of the plug outer conductor 121 slightly protrudes outwards in the radial direction so as to ensure reliable contact with the socket outer conductor 231 and assist in axial limiting. The coaxial connector socket 23 is fixed to the rotation shaft 22, and also ensures accuracy of coaxiality between the socket inner conductor 232, the socket outer conductor 231, and the rotation shaft 22 by a manufacturing process. The socket outer conductor 231 is cylindrical, the root of the socket outer conductor is slightly recessed inwards along the radial direction, and the recess is matched with the protrusion at the end part of the plug outer conductor 121 so as to realize the axial limiting effect and ensure the reliable contact between the socket outer conductor and the protrusion. The socket inner conductor 232 is thin needle-shaped, and the end part of the socket inner conductor 232 is provided with a guide sharp angle, so that the socket inner conductor 232 can be inserted into the first jack 124 more conveniently under the guide action of the guide sharp angle, the operation is more convenient, and the inserting difficulty is reduced.

Preferably, as shown in fig. 12, the outer plug conductor 121 and the inner plug conductor 122 are disposed at least within a length axially matched with the coaxial connector socket 23 and spaced from the dielectric 123, the inner plug conductor 122 is provided with a plurality of first elongated slots 125, and the first elongated slots 125 extend through one end of the inner plug conductor 122 and axially along the inner plug conductor, so that the inner plug conductor 122 is divided into a plurality of sheet structures on average, in this embodiment, the inner plug conductor 122 is provided with two first elongated slots 125, and the two first elongated slots 125 divide the inner plug conductor 122 into two sheet structures on average. The plug outer conductor 121 is provided with a plurality of second long grooves 126, and the second long grooves 126 penetrate through one end of the plug outer conductor 121 and axially extend beyond the length axially matched with the coaxial connector socket 23, so that the plug outer conductor 121 is evenly divided into a plurality of sheet-shaped structures, tiny deformation is generated during plugging and pulling, necessary contact force is maintained, and reliable transmission of electric signals is ensured. When the coaxial connector plug 12 is mated with the coaxial connector receptacle 23, the gap provides a deformation space due to the gap between the plug outer conductor 121 and the dielectric body 123, so that the plug outer conductor 121 is radially deformed and contracted by the extrusion of the receptacle outer conductor 231, and at the same time, the gap also provides a deformation space due to the gap between the plug inner conductor 122 and the dielectric body 123, so that the plug inner conductor 122 is radially deformed and expanded by the extrusion of the receptacle inner conductor 232. The socket inner conductor 232 and the socket outer conductor 231 are both pressed, but hardly deformed radially.

By setting the coaxial connector receptacle 23 to an inner-pin outer-hole type structure and setting the coaxial connector plug 12 to an elastic inner-hole outer-pin type structure, wear or deformation in the process of inserting and extracting the coaxial connector plug 12 and the coaxial connector receptacle 23 can be reduced, the service life of the coaxial connector receptacle 23 can be prolonged, the external dimensions of the coaxial connector plug 12 and the coaxial connector receptacle 23 can be further reduced, manufacturability is ensured, and the coaxial connector plug 12 which is easy to wear and deform is arranged at the end of the disposable catheter connector 1, even if deformation of the plug outer conductor 121 or the plug inner conductor 122 cannot be recovered, and the coaxial connector plug can be replaced each time.

It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims

1. A coaxial catheter interface device, comprising:

the catheter connector (1) comprises a catheter shell (11), and a coaxial connector plug (12) and a rotary cylinder (13) which are coaxially and rotatably arranged in the catheter shell (11), wherein the coaxial connector plug (12) is inserted and fixed in the rotary cylinder (13);

the catheter plug-in part (2) comprises a fixed sleeve (21) and a rotating shaft (22) coaxially and rotatably arranged in the fixed sleeve (21), an inner hole (221) of the rotating shaft (22) is provided with a coaxial connector socket (23), and the catheter shell (11) can be coaxially plugged in the fixed sleeve (21) so as to enable the coaxial connector plug (12) to be plugged on the coaxial connector socket (23) and enable the coaxial connector plug (12) and the coaxial connector socket (23) to synchronously start and stop rotating or axially moving;

a limit groove (222) is formed in one end, close to the rotary cylinder body (13), of the rotary shaft (22), the limit groove (222) penetrates through one end of the rotary shaft (22) and extends along the axial direction of the rotary shaft, a limit boss (131) is arranged on the outer wall of the rotary cylinder body (13), the limit boss (131) is in plug-in fit with the limit groove (222), an inclined spiral surface (223) is arranged on the inner wall of the opening end of the rotary shaft (22), the inclined spiral surface (223) is obliquely arranged from outside to inside towards the bottom of the inner hole (221), a spherical end face (132) is arranged at the end, close to the rotary shaft (22), of the limit boss (131), and the spherical end face (132) is in sliding fit with the inclined spiral surface (223);

And a locking mechanism (3) axially slidably provided on the fixing sleeve (21), wherein the locking mechanism (3) is configured to axially lock the catheter housing (11) within the fixing sleeve (21).

2. Coaxial catheter interface device according to claim 1, characterized in that the locking mechanism (3) comprises:

the limiting sleeve (31) is sleeved outside the fixed sleeve (21) in a sliding manner;

an elastic member (32) having one end connected to or abutting against an end surface of the limit sleeve (31) and the other end connected to or abutting against an end surface of the fixed sleeve (21);

the ball (33), set up accommodation hole (211) on the lateral wall of fixed sleeve (21), ball (33) are located in accommodation hole (211), annular recess (111) have been seted up along the axial on the lateral wall of pipe casing (11) with the position that accommodation hole (211) corresponds, ball (33) can partly hold in recess (111), limit sleeve (31) can follow the axial displacement of fixed sleeve (21), in order will ball (33) locking or unblock in recess (111).

3. Coaxial catheter interface device according to claim 2, characterized in that the number of receiving holes (211) is at least two, at least two of the receiving holes (211) being evenly distributed along the circumference of the fixing sleeve (21), the balls (33) being arranged in each receiving hole (211).

4. Coaxial catheter interface device according to claim 2, characterized in that the outer wall of the fixed sleeve (21) is convexly provided with a limiting member (34), the limiting member (34) is located at a side close to the catheter housing (11), and the limiting sleeve (31) can abut against the limiting member (34) to limit the limiting sleeve (31) from being separated from the fixed sleeve (21) in the axial direction.

5. Coaxial catheter interface device according to any of claims 1-4, characterized in that a vibration damping ring (14) is arranged on the outer wall of the catheter housing (11) in a surrounding manner, the vibration damping ring (14) is arranged coaxially with the catheter housing (11) and the fixing sleeve (21) respectively, and the vibration damping ring (14) is in interference fit with the inner wall of the fixing sleeve (21) after the catheter housing (11) is completely inserted into the fixing sleeve (21).

6. The coaxial catheter interface device of claim 5, wherein the vibration reduction ring (14) comprises a cylindrical portion (141) and a tapered portion (142) connected, the tapered portion (142) being located on a side proximal to the fixed sleeve (21), an outer wall of the cylindrical portion (141) being in interference fit with an inner wall of the fixed sleeve (21).

7. The coaxial catheter interface device of any one of claims 1-4, wherein the coaxial connector plug (12) comprises a plug outer conductor (121) and a plug inner conductor (122) coaxially arranged inside the plug outer conductor (121), a dielectric body (123) is arranged between the plug inner conductor (122) and the plug outer conductor (121), and a first jack (124) is formed inside the plug inner conductor (122);

the coaxial connector socket (23) comprises a socket outer conductor (231) and a socket inner conductor (232) coaxially arranged inside the socket outer conductor (231), an insulating shell (235) is wrapped outside the socket outer conductor (231), a second jack (233) is formed between the socket outer conductor (231) and the socket inner conductor (232), the socket inner conductor (232) is inserted into the first jack (124), and the plug outer conductor (121) is inserted into the second jack (233).

8. The coaxial catheter interface device of claim 7, wherein the plug outer conductor (121) and the plug inner conductor (122) are disposed in clearance with the dielectric body (123) at least within a length axially mated with the coaxial connector receptacle (23);

The plug inner conductor (122) is provided with a plurality of first long grooves (125), the first long grooves (125) penetrate through one end of the plug inner conductor (122) and axially extend along the first long grooves, the plug outer conductor (121) is provided with a plurality of second long grooves (126), and the second long grooves (126) penetrate through one end of the plug outer conductor (121) and axially extend beyond the length axially matched with the coaxial connector socket (23).