Catheter connection device and ultrasound pullback system

Abstract

The application belongs to the technical field of medical instrument equipment, and discloses a catheter connecting device and an ultrasonic withdrawal system. The catheter connecting device comprises a containing shell and a coaxial connector socket part. Opposite sides of the shell wall of the containing shell are provided with through holes. The catheter connecting device also has a catheter plug-in shell and a coaxial connector plug part. The shell wall of the catheter plug-in shell is provided with a plug-in slot corresponding to the through hole. The catheter connecting device also has a locking part and an elastic part. The locking part is connected to the containing shell. When the second end of the locking part moves towards or away from the containing shell, the first end of the locking part moves away from or into the plug-in slot. One end of the elastic part is connected to the locking part, and the other end is connected to the containing shell to reset the locking part. The ultrasonic withdrawal system adopts the catheter connecting device. The catheter plug-in shell can be limited to move in the axial and circumferential directions, and the coaxial connector socket part and the coaxial connector plug part can be kept synchronous rotation, thereby improving the reliability of mechanical connection and signal transmission.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical instrument equipment, in particular to a catheter connecting device and an ultrasound pullback system. BACKGROUND

[0002] Intravascular ultrasound (IVUS) is a new technology for clinical diagnosis and interventional treatment of coronary heart disease. By sending a miniature ultrasonic transducer into the human cardiovascular cavity through an interventional catheter to emit ultrasonic waves and collect echoes, the cross-sectional morphology, size and blood flow information of the blood vessel are displayed in real time after signal processing, which assists in the diagnosis and treatment of calcification, fibrosis, lipid pool and other vascular lesions.

[0003] The intravascular ultrasound catheter is used as a disposable consumable, which generally needs to be rotated at a specific frequency and linearly moved at a certain speed by an external reusable catheter connecting device to drive the transducer assembly to collect image information of the target blood vessel section, and ensure easy assembly and disassembly, high movement precision, stable information transmission and long service life during use. However, the current catheter connecting device generally uses interference fit connection, which has a complex structure and is prone to loose connection after long-term use, resulting in unstable axial and circumferential positioning. SUMMARY

[0004] The purpose of the present application is to provide a catheter connecting device and an ultrasound pullback system, which improves the reliability of the connection, avoids the instability of the transmission signal caused by the shaking of the connection, and improves the user's experience.

[0005] To achieve this purpose, the following technical solutions are used in the present application:

[0006] The catheter connecting device comprises:

[0007] The accommodating shell has an open end, a coaxial connector socket portion is rotatably arranged in the accommodating shell, and through holes are arranged on opposite sides of the accommodating shell;

[0008] The catheter plug-in shell has an open end, a coaxial connector plug portion is rotatably arranged in the catheter plug-in shell, and the catheter plug-in shell can be plugged into the accommodating shell to connect the coaxial connector plug portion and the coaxial connector socket portion, and a plug slot corresponding to the through hole is arranged on the shell wall of the catheter plug-in shell;

[0009] Two locking members are arranged on both sides of the accommodating shell, the locking members are connected to the accommodating shell, the first end of the locking member penetrates into the accommodating shell through the through hole, and when the second end of the locking member moves close to or away from the accommodating shell, the first end of the locking member moves away from or into the plug slot;

[0010] An elastic member, one end of which is connected to the second end of the locking member, and the other end of which is connected to the accommodating shell to enable the locking member to reset.

[0011] Preferably, the locking member comprises a pressing section, a connecting section and a plug-in section connected in sequence, the pressing section and the plug-in section are oppositely arranged, the connecting section is provided with a switching hole, a switching shaft is plugged into the switching hole, the switching shaft is connected to the shell wall of the accommodating shell, and the plug-in section passes through the through hole to be able to move away from or into the plug-in slot.

[0012] Preferably, the elastic member is arranged between the pressing section and the accommodating shell.

[0013] Preferably, one end of the plug-in section facing the plug-in slot is provided with a guide inclined surface, and the guide inclined surface faces the opening of the accommodating shell.

[0014] Preferably, the catheter plug-in shell is further provided with a rotation stopping catch, and the accommodating shell is provided with a catch slot matched with the rotation stopping catch.

[0015] Preferably, the coaxial connector socket part comprises an open-ended rotating sleeve and a coaxial connector socket arranged in the rotating sleeve; the coaxial connector plug part comprises a rotating body and a coaxial connector plug arranged on the rotating body, the coaxial connector plug is plugged into the coaxial connector socket in cooperation; the rotating sleeve is provided with a limiting slot extending from the open end of the rotating sleeve to the other end, and the outer wall of the rotating body is provided with a limiting boss matched with the limiting slot.

[0016] Preferably, the end face of the open end of the rotating sleeve is provided with an inclined spiral surface, the inclined spiral surface is arranged to be inclined from outside to inside towards the inner bottom of the rotating sleeve, the limiting boss close to the end of the rotating sleeve is provided with a spherical guide surface in a spherical shape, and the spherical guide surface is slidingly matched with the rotating sleeve.

[0017] Preferably, the number of limiting slots is two, the two limiting slots are oppositely arranged; the number of limiting bosses is also two, the two limiting bosses are oppositely arranged, the number of inclined spiral surfaces is four, the middle plane of the two limiting slots is taken as a symmetry plane, each side of the symmetry plane has two inclined spiral surfaces, the rotation directions of the two inclined spiral surfaces on each side are opposite, the two inclined spiral surfaces on each side are connected to form a protruding pointed end outward, and the four inclined spiral surfaces are arranged symmetrically with respect to the longitudinal axis of the rotating sleeve.

[0018] As preferred, a damping ring is arranged outside the shell wall of the catheter connector shell, the catheter connector shell is coaxially arranged with the catheter connector shell and the accommodating shell respectively, and the accommodating shell is in interference fit with the damping ring when the catheter connector shell is fully inserted into the accommodating shell.

[0019] Also provided is an ultrasound pullback system comprising the catheter connecting device as described above.

[0020] The present application has the following advantages:

[0021] By the locking member connected to the accommodating shell, when the second end of the locking member is inserted into the slot of the catheter connector shell, the movement of the catheter connector shell in the axial and circumferential directions can be limited in both directions, avoiding the instability of the transmission signal at the coaxial connector inside caused by the shaking of the two; further improving the reliability of the connection; at the same time, the locking member can be inserted into or pulled out of the slot in the form of manual pressing, which is convenient to operate, and the elastic member can provide stable support force on one hand to limit the locking member from sliding out of the slot and make the connection stable; on the other hand, the elastic member can also quickly reset the locking member when it is separated from the slot, so that the locking member is more convenient to insert; the user's experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the overall structure schematic diagram of the catheter connecting device of the present application;

[0023] Figure 2 is the cross-sectional view of the catheter connecting device of the present application;

[0024] Figure 3 is the schematic diagram of the locking member inserted into the catheter connector shell in the catheter connecting device of the present application;

[0025] Figure 4 is the schematic diagram of the locking member in the catheter connecting device of the present application;

[0026] Figure 5 is the schematic diagram of the coaxial connector plug part and the coaxial connector plug in the catheter connecting device of the present application;

[0027] Figure 6 is the cooperation schematic diagram of the limiting boss and the inclined helical surface in the first state in the catheter connecting device of the present application;

[0028] Figure 7 is the cooperation schematic diagram of the limiting boss and the inclined helical surface in the second state in the catheter connecting device of the present application;

[0029] Figure 8 is the schematic diagram of the small end diameter and the large end diameter of the inclined helical surface in the catheter connecting device of the present application;

[0030] Figure 9is a schematic view showing the maximum guiding free stroke LS between the coaxial connector plug and the coaxial connector socket in the catheter connecting device of the present application.

[0031] In the drawings:

[0032] 1, housing; 11, mortise; 2, coaxial connector socket part; 21, rotating sleeve; 211, limiting groove; 212, inclined helical surface; 22, coaxial connector socket; 3, catheter insertion housing; 31, insertion slot; 32, rotation stopping mortise; 4, coaxial connector plug part; 41, limiting boss; 42, spherical guide surface; 43, rotating body; 44, coaxial connector plug; 45, conical inclined surface; 5, locking member; 51, pressing section; 52, connecting section; 53, insertion section; 54, switching hole; 55, guiding inclined surface; 6, elastic member; 7, damping ring; 8, first switching bearing; 9, second switching bearing. DETAILED DESCRIPTION

[0033] The present application will be further described below in conjunction with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures.

[0034] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0036] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and other orientation or position relationships are based on the orientation or position relationships shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] As Figures 1-9 shown, the present embodiment provides a catheter connecting device, which comprises a containing shell 1, one end of the containing shell 1 is open, a coaxial connector socket part 2 is rotationally arranged in the containing shell 1, and through holes are arranged on opposite sides of the shell wall of the containing shell 1; further comprising a catheter plug-in shell 3, one end of the catheter plug-in shell 3 is open, a coaxial connector plug part 4 is rotationally arranged in the catheter plug-in shell 3, the catheter plug-in shell 3 can be plugged into the containing shell 1 to connect the coaxial connector plug part 4 with the coaxial connector socket part 2, and a plug slot 31 corresponding to the through hole is arranged on the shell wall of the catheter plug-in shell 3; further comprising locking members 5 and elastic members 6, two locking members 5 are arranged on both sides of the containing shell 1, the locking members 5 are connected to the containing shell 1, the first end of the locking members 5 penetrates into the containing shell 1 through the through hole, when the second end of the locking members 5 moves close to or away from the containing shell 1, the first end of the locking members 5 is away from or inserted into the plug slot 31; one end of the elastic member 6 is connected to the second end of the locking member 5, and the other end of the elastic member 6 is connected to the containing shell 1 to enable the locking member 5 to reset.

[0038] Through the locking members 5 connected to the containing shell 1, when the second end of the locking members 5 is inserted into the plug slot 31 of the catheter plug-in shell 3, the catheter plug-in shell 3 can be limited in axial and circumferential movement in both directions, avoiding the instability of the transmission signal caused by the shaking of the two; further improving the reliability of the connection; at the same time, the locking members 5 can be inserted into or pulled out of the plug slot 31 in the form of manual pressing, which is convenient to operate, and the elastic member 6 can provide stable support force on one hand to limit the locking members 5 from sliding out of the plug slot 31 to make the connection stable; on the other hand, the elastic member 6 can also make the locking members 5 reset quickly when the locking members 5 are separated from the plug slot 31, so that the locking members 5 are more convenient to plug in.

[0039] The present embodiment will be described in detail as follows, such as Figures 1-4As shown in the figure, the embodiment provides a catheter connecting device, which comprises an accommodation shell 1 with one end open and a catheter insertion shell 3 with one end open. In the embodiment, the inner diameter of the accommodation shell 1 is larger than the outer diameter of the catheter insertion shell 3, the catheter insertion shell 3 can be inserted into the accommodation shell 1, and through holes are arranged on the opposite sides of the shell wall of the accommodation shell 1. In the embodiment, the through holes are symmetrically arranged with the central axis of the accommodation shell 1. The shell wall of the catheter insertion shell 3 is provided with insertion slots 31 corresponding to the through holes. The catheter connecting device further has locking members 5, two locking members 5 are arranged on the two sides of the accommodation shell 1, the locking members 5 are connected to the shell wall of the accommodation shell 1, the first end of the locking members 5 penetrates into the accommodation shell 1 through the through holes, and when the second end of the locking members 5 moves close to or away from the accommodation shell 1, the first end of the locking members 5 is away from or inserted into the insertion slots 31. Specifically, as Figure 4 As shown in the figure, the locking members 5 comprise a pressing section 51, a connecting section 52 and an insertion section 53 connected in sequence. In the embodiment, the first end of the locking members 5 is the insertion section 53, and the second end of the locking members 5 is the pressing section 51. The pressing section 51 and the insertion section 53 are arranged oppositely, i.e. the pressing section 51, the connecting section 52 and the insertion section 53 are connected in the shape of U. The connecting section 52 is provided with a connecting hole 54, a rotating shaft is inserted into the connecting hole 54, and the rotating shaft is connected to the shell wall of the accommodation shell 1 to make the locking members 5 rotatably connected to the shell wall of the accommodation shell 1. The insertion section 53 penetrates through the through hole to be away from or inserted into the insertion slots 31. By using the above structure, when force is applied to the pressing section 51, the pressing section 51 is close to the accommodation shell 1, the locking members 5 rotate around the rotating shaft, thereby driving the insertion section 53 to be away from the insertion slots 31. When the pressing section 51 is forced to be away from the shell wall of the accommodation shell 1, the locking members 5 rotate around the rotating shaft, thereby driving the insertion section 53 to be close to the insertion slots 31 so that the insertion section 53 can be inserted into the insertion slots 31. The locking members 5 arranged on the opposite sides of the accommodation shell 1 limit the catheter insertion shell 3 in the circumferential direction and the circumferential direction, so that the connection between the accommodation shell 1 and the catheter insertion shell 3 is more stable.

[0040] As Figure 1 and Figure 3As shown, the conduit connecting device also has a resilient member 6, one end of the resilient member 6 is connected to the second end of the locking member 5, and the other end of the resilient member 6 is connected to the shell wall of the accommodating shell 1 to enable the locking member 5 to reset. In this embodiment, the resilient member 6 is a compression spring, and in other embodiments, an elastic recovery rubber pad or the like can also be used. Specifically, the resilient member 6 is arranged between the pressing section 51 on the locking member 5 and the accommodating shell 1, when the pressing section 51 presses the resilient member 6, the insertion section 53 of the locking member 5 is away from the insertion slot 31, and during this period, the resilient member 6 provides a restoring force to facilitate the resetting of the locking member 5. The use of the above structure can provide a restoring force, facilitate the resetting of the locking member 5, and also keep the insertion section 53 in a state of being inserted into the insertion slot 31, thereby making the insertion more compact and firm. Further, in order to facilitate the insertion, the end of the insertion section 53 facing the insertion slot 31 has a guide slope 55, and the guide slope 55 faces the opening of the accommodating shell 1, when the conduit insertion shell 3 is inserted into the accommodating shell 1, the end of the conduit insertion shell 3 abuts against the guide slope 55 and pushes the insertion section 53 to move away from the conduit insertion shell 3. Thus, when the conduit insertion shell 3 is inserted into the accommodating shell 1, the conduit insertion shell 3 abuts against the guide slope 55 to make the conduit insertion shell 3 continue to move forward smoothly, and the insertion section 53 moves away from the insertion slot 31, at this time, the locking member 5 rotates through the pivot, and the pressing section 51 presses the resilient member 6; when the insertion section 53 moves to the position of the insertion slot 31, the insertion section 53 is inserted into the insertion slot 31, and the resilient member 6 provides a restoring force to keep the insertion section 53 inserted into the insertion slot 31; and when the conduit insertion shell 3 exits the accommodating shell 1, the pressing section 51 is pressed to be close to the accommodating shell 1, at this time, the locking member 5 rotates through the pivot, thereby making the insertion section 53 exit the insertion slot 31, the conduit insertion shell 3 can be pulled out, and the locking member 5 can be reset by releasing the pressing section 51. Further, in the natural state without external force, the distance between the two insertion sections 53 is less than the outer diameter of the accommodating shell 1, so that the insertion is more compact. In addition, in order to facilitate one-handed operation and improve the convenience of operation, the two locking members 5 are symmetrically arranged, and the two resilient members 6 and the two pressing sections 51 are arranged on the same side of the accommodating shell 1. Further, in order to facilitate the smooth insertion of the conduit insertion shell 3 and the accommodating shell 1, the conduit insertion shell 3 is also provided with a rotation stopping tenon 32, the rotation stopping tenon 32 is coaxially arranged on the conduit insertion shell 3, and the accommodating shell 1 is provided with a tenon slot 11 matched with the rotation stopping tenon 32, in this embodiment, the rotation stopping tenon 32 is arranged on the outer wall of the conduit insertion shell 3, and the tenon slot 11 is arranged on the outer wall of the accommodating shell 1, when the rotation stopping tenon 32 is inserted into the tenon slot 11, the first end of the locking member 5 can be inserted into the insertion slot 31. Thus, during the insertion, only the rotation stopping tenon 32 and the tenon slot 11 need to be aligned to achieve preliminary positioning, thereby facilitating the insertion, and further limiting the mutual rotation of the conduit insertion shell 3 and the accommodating shell 1.

[0041] Further, as shown in FIG. 6, the conduit connecting device also has a locking member 5, the locking member 5 is arranged in the accommodating shell 1, and the locking member 5 has a pivot 52 and an insertion section 53, the pivot 52 is arranged on the pressing section 51, and the insertion section 53 is arranged on the other end of the pressing section 51, the insertion section 53 is arranged to be inserted into the insertion slot 31 of the conduit insertion shell 3, and the insertion section 53 is arranged to be inserted into the insertion slot 31 of the conduit insertion shell 3. Figure 2As shown, the outer wall of the catheter insertion shell 3 is provided with a damping ring 7, which is coaxially arranged with the catheter insertion shell 3 and the accommodating shell 1 respectively. When the catheter insertion shell 3 is completely inserted into the accommodating shell 1, the accommodating shell 1 is in interference fit with the damping ring 7. With the above structure, on the one hand, the insertion of the two is more compact, and on the other hand, the damping ring 7 can also absorb vibration energy to provide damping effect. In order to facilitate insertion, further, the damping ring 7 is a conical ring, which is sleeved on the outer wall of the catheter insertion shell 3, and the smaller diameter end of the conical ring faces the accommodating shell 1. In this embodiment, the damping ring 7 is made of silica gel with low hardness, and in other embodiments, it can also be made of rubber with low hardness.

[0042] As shown in Figure 2 and Figure 5 , the coaxial connector plug part 4 is rotatably arranged in the catheter insertion shell 3 of the catheter connection device, one end of the coaxial connector plug part 4 is used to connect the catheter, and the other end of the coaxial connector plug part 4 is used to connect the coaxial connector socket part 2. Specifically, the catheter insertion shell 3 is provided with a second transfer bearing 9, and the coaxial connector plug part 4 is transferred on the second transfer bearing 9; and the second transfer bearing 9 is rotatably arranged in the catheter insertion shell 3. The coaxial connector socket part 2 includes an open-ended rotating sleeve 21 and a coaxial connector socket 22 arranged in the rotating sleeve 21; and the coaxial connector plug part 4 includes a rotating body 43 and a coaxial connector plug 44 arranged on the rotating body 43, and the coaxial connector plug 44 can be inserted into the coaxial connector socket 22; in this embodiment, the coaxial connector plug 44 and the coaxial connector socket 22 form a coaxial connector for information transmission. In order to facilitate rotation, the first transfer bearing 8 is arranged in the accommodating shell 1, and the rotating sleeve 21 is connected to the first transfer bearing 8 for rotation. In order to coaxially rotate, the rotating sleeve 21 is provided with a limiting groove 211 extending from the open end to the other end of the rotating sleeve 21, and the outer wall of the rotating body 43 is provided with a limiting boss 41 matched with the limiting groove 211, so that when the accommodating shell 1 and the catheter insertion shell 3 are inserted, the limiting boss 41 on the rotating body 43 can be inserted into the limiting groove 211 on the rotating sleeve 21, so that the contact surface between the limiting groove 211 and the limiting boss 41 can transmit the rotating torque to rotate coaxially. Preferably, the limiting boss 41 and the limiting groove 211 have a small gap along the width direction of the limiting groove 211 to reduce the inertial impact when the rotation starts and stops, and the limiting boss 41 and the limiting groove 211 have a large interference fit along the radial direction of the butt joint, but the limiting boss 41 should not exceed the outer surface of the limiting groove 211 to ensure sufficient structural strength for rotation driving or rotation braking and no motion interference.

[0043] Further, in order to make the limiting boss 41 quickly enter the limiting groove 211, the end face of the opening end of the rotating sleeve 21 is provided with a slanting spiral surface 212, which is inclined from outside to inside towards the inner bottom of the rotating sleeve 21, while the end of the limiting boss 41 close to the rotating sleeve 21 is provided with a spherical guide surface 42, which is connected with the outer surface of the limiting boss 41 through an arc surface, and the spherical guide surface 42 is in sliding fit with the slanting spiral surface 212, so that in the process of insertion, no matter the relative position of the two, the limiting boss 41 can finally fall into the limiting groove 211. Specifically, when the rotating body 43 just starts to insert into the rotating sleeve 21, and when the limiting boss 41 and the limiting groove 211 are not completely aligned, the spherical guide surface 42 at the end of the limiting boss 41 can completely fall on the slanting spiral surface 212, and as the rotating body 43 is further pushed, the friction torque generated on the slanting spiral surface 212 will make the side with smaller rotating resistance torque rotate to avoid, because the bearing friction is very small, so usually the rotating sleeve 21 rotates until the limiting boss 41 is just aligned with the center of the limiting groove 211. At this time, the rotating body 43 and the rotating sleeve 21 have no relative rotation, and can only move axially, and continuing to push the rotating body 43 can insert the limiting boss 41 into the limiting groove 211.

[0044] Through the above setting, the rotating sleeve 21 can automatically rotate to correct the position, so that the limiting boss 41 is inserted into the limiting groove 211, without the need for artificial alignment of the limiting groove 211 and the limiting boss 41 before insertion, facilitating quick blind insertion from any position, and improving the convenience of insertion. And by setting the end face of the limiting boss 41 as a spherical guide surface 42, and setting the end face of the rotating sleeve 21 as a slanting spiral surface 212, there is only one stable point contact between the limiting boss 41 and the slanting spiral surface 212, which is conducive to reducing the sliding friction, making the rotation smoother and maintaining good structural strength. Compared with the combination of the positive spiral surface and the rectangular prism in the prior art, the operation force during insertion and removal can be significantly reduced, and the insertion and removal are more stable, improving the use efficiency and user experience, and avoiding damage to the end face of the rotating sleeve 21, reducing wear.

[0045] More specifically, the number of limiting grooves 211 is set to two, and the two limiting grooves 211 are oppositely arranged; correspondingly, the number of limiting bosses 41 is also set to two, and the two limiting bosses 41 are oppositely arranged, and each limiting boss 41 can be inserted and fitted with the corresponding limiting groove 211. Through the above setting, the coaxial rotation of the rotating body 43 and the rotating sleeve 21 after insertion and fitting is more stable and reliable, and the torque transmission is more stable and uniform. Of course, in other embodiments, the limiting boss 41 and the limiting groove 211 can also be arranged in three or more than three uniform ways, which can be flexibly set according to actual needs, and are not limited here.

[0046] Correspondingly, the number of the inclined helical surfaces 212 is set to four, and the middle plane of the two limiting grooves 211 is taken as a symmetry plane, and each side of the symmetry plane has two inclined helical surfaces 212, the rotation directions of the two inclined helical surfaces 212 on each side are opposite, and the two inclined helical surfaces 212 on each side are connected to form a pointed end protruding outward, and the four inclined helical surfaces 212 are symmetrically arranged in pairs with respect to the longitudinal axis of the rotating sleeve 21. The middle plane of the two limiting grooves 211 is a plane formed by the central line of the two limiting grooves 211 in the axial direction. Before the insertion, the radial relative position between the rotating body 43 and the rotating sleeve 21 is random, and the spherical guide surface 42 of the limiting boss 41 can fall on any inclined helical surface 212. By setting the number of the inclined helical surfaces 212 to four, the rotating sleeve 21 can be rotated by at most 90 degrees to insert the limiting boss 41 into the limiting groove 211, the operation is more convenient, the required pushing stroke is shorter, the insertion efficiency is improved, and compared with the arrangement of two inclined helical surfaces 212, the axial space can be saved, so that the rotating sleeve 21 can be made smaller. Of course, in other embodiments, the number of the inclined helical surfaces 212 can also be set to two, and one inclined helical surface 212 is arranged on each side of the connecting line of the two limiting grooves 211, which can be flexibly set according to requirements, and is not specifically limited here.

[0047] As shown in Figure 8 the embodiment, the inclined helical surface 212 is an inclined helical surface formed in the axial direction of the rotating sleeve 21, that is, the central axis of the rotating sleeve 21 is taken as a guide axis, and a cylindrical helical line on the inner cavity of the rotating sleeve 21 is taken as a guide line. As viewed in the axial cross section of the rotating sleeve 21, the included angle α between the two opposite generatrices of the inclined helical surface 212 is 60°-120°, and preferably 90°, and the guide angle of the inclined helical surface 212 is half of the included angle α, that is, 30°-60°, and preferably 45°. By setting the guide angle of the inclined helical surface 212 within the above range, the operating force during insertion can be reduced, and the rotating body 43 can be completely inserted into the rotating sleeve 21 more labor-saving. Specifically, the guide angle of the inclined helical surface 212 can be 30°, 45°, 50° or 60°, which can be flexibly set according to requirements.

[0048] As shown in Figure 8 , the small end diameter D1 of the inclined helical surface 212 is equal to the diameter of the inner cavity of the rotating sleeve 21, and the large end diameter D2 of the inclined helical surface 212 is not less than the maximum envelope circle diameter of the limiting boss 41, so that the spherical guide surface 42 can be completely on the inclined helical surface 212, and can be more smoothly and slidingly matched with the inclined helical surface 212, so that the limiting boss 41 can be smoothly inserted into the limiting groove 211, and the jamming phenomenon can be prevented.

[0049] When the number of inclined helical surfaces 212 along the circumferential direction is four, the quarter pitch of the inclined helical surfaces 212 is not less than the maximum guiding idle stroke LS between the coaxial connector plug 44 and the coaxial connector socket 22. Wherein, the state that the spherical guide surface 42 of the limiting boss 41 is in contact with the tip formed by the inclined helical surfaces 212 is defined as the first state, i.e. the state as shown in FIG. 8, and the state that the limiting boss 41 is aligned with the limiting groove 221 is defined as the second state, i.e. the state as shown in FIG. 9. When the limiting boss 41 is switched from the first state to the second state, i.e. the rotating sleeve 21 is rotated by 90°, the axial distance traveled by the limiting boss 41 is the quarter pitch of the inclined helical surfaces 212, i.e. Hp / 4 as shown in FIG. 10. The maximum guiding idle stroke LS is determined in the following way: the spherical guide surface 42 of the limiting boss 41 is just in contact with the tip formed by two inclined helical surfaces 212, at this time, the distance between the end face of the coaxial connector plug 44 and the end face of the coaxial connector socket 22 is the maximum guiding idle stroke LS as shown in FIG. 11. Figure 6 Figure 7 Figure 8 Figure 9

[0050] In the process of inserting the rotating body 43 into the rotating sleeve 21, the rotating sleeve 21 needs to be rotated, and if the coaxial connector plug 44 and the coaxial connector socket 22 are inserted and matched during this insertion process, the rotating sleeve 21 may not be easily rotated due to the increase of friction resistance, thereby increasing the difficulty of insertion. By using the above arrangement, even if the spherical guide surface 42 falls in the worst position on the inclined helical surface 212, i.e. the rotating sleeve 21 needs to be rotated by the maximum stroke, it can be ensured that the coaxial connector plug 44 and the coaxial connector socket 22 do not collide during the above rotation process, thereby ensuring that the rotating sleeve 21 is more smoothly rotated, and further ensuring that it can be smoothly inserted and pulled out. Further, the side wall at the end of the rotating body 43 is provided as a tapered inclined surface 45. The tapered inclined surface 45 can ensure that there is only the spherical guide surface 42 between the rotating body 43 and the inclined helical surface 212, avoiding the formation of multiple point contacts at the end during the insertion and pulling out process, thereby making the operation more convenient and reducing the difficulty of insertion.

[0051] The embodiment also provides an ultrasonic withdrawal system, which uses the above-mentioned catheter connecting device, the coaxial connector plug part 4 on the catheter connecting device connects the catheter, the coaxial connector socket 22 connects the external signal receiving device, and the rotating sleeve 21 connects the external driving equipment. Thus, the above-mentioned catheter connecting device improves the reliability and convenience of the connection and communication between the catheter and the driving equipment, and the catheter connecting device is more convenient to use during insertion, thereby improving the user experience.

[0052] ​​​​Obviously, the above embodiments of the present application are merely exemplary but not intended to limit the embodiments of the present application. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the scope of the present application. It is not necessary or possible to enumerate all the embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A catheter connection device, characterized in that The utility model relates to a coaxial connector, which comprises: a containing shell (1) with one end being open, a coaxial connector socket (2) being rotatably arranged in the containing shell (1), and a through hole being arranged on the opposite side of the containing shell (1); a catheter insertion shell (3) with one end being open, a coaxial connector plug (4) being rotatably arranged in the catheter insertion shell (3), and the catheter insertion shell (3) being capable of being inserted into the containing shell (1) so that the coaxial connector plug (4) is connected with the coaxial connector socket (2), and a slot (31) corresponding to the through hole being arranged on the shell wall of the catheter insertion shell (3); two locking members (5) being arranged on the two sides of the containing shell (1), the locking members (5) being connected to the containing shell (1), the first end of the locking members (5) penetrating into the containing shell (1) through the through hole, and the first end of the locking members (5) being away from or inserted into the slot (31) when the second end of the locking members (5) moves close to or away from the containing shell (1); the locking members (5) comprise a pressing section (51), a connecting section (52) and an insertion section (53) connected in sequence, the pressing section (51) and the insertion section (53) being oppositely arranged, the connecting section (52) being provided with a connecting hole (54), a rotating shaft being inserted into the connecting hole (54), the rotating shaft being connected to the shell wall of the containing shell (1), and the insertion section (53) penetrating through the through hole so as to be away from or inserted into the slot (31); an elastic member (6) having one end connected to the second end of the locking members (5) and the other end connected to the containing shell (1); the coaxial connector socket (2) comprises a rotating sleeve (21) with one end being open and a coaxial connector socket (22) arranged in the rotating sleeve (21); the coaxial connector plug (4) comprises a rotating body (43) and a coaxial connector plug (44) arranged on the rotating body (43), the coaxial connector plug (44) being capable of being inserted into the coaxial connector socket (22) in cooperation; the rotating sleeve (21) is provided with a limiting slot (211) extending from the open end to the other end of the rotating sleeve (21), and the outer wall of the rotating body (43) is provided with a limiting boss (41) capable of being inserted into the limiting slot (211) in cooperation. An end face of an open end of the rotating sleeve (21) is provided with inclined helical surfaces (212) which are inclined from outside to inside towards the inner bottom of the rotating sleeve (21), the limiting boss (41) is provided with a spherical spherical guide surface (42) near the end of the rotating sleeve (21), the spherical guide surface (42) is in sliding fit with the rotating sleeve (21); the inclined helical surfaces (212) are provided with four, the quarter lead of the inclined helical surfaces (212) is not less than the maximum guiding idle stroke between the coaxial connector plug (44) and the coaxial connector socket (22); the side wall of the end of the rotating body (43) is provided with a tapered inclined surface (45); The state of the tip contact between the spherical guide surface (42) and the inclined helical surface (212) is the first state, the state of the limiting boss (41) aligned with the limiting groove (211) is the second state, when the limiting boss (41) switches from the first state to the second state, the axial distance of the limiting boss (41) is the quarter lead of the inclined helical surface (212); when the spherical guide surface (42) is in contact with the tip of two inclined helical surfaces (212), the distance between the end face of the coaxial connector plug (44) and the end face of the coaxial connector socket (22) is the maximum guiding idle stroke.

2. The conduit connection device of claim 1, wherein, The elastic member (6) is arranged between the pressing section (51) and the accommodating shell (1).

3. The conduit connection device of claim 1, wherein, The end of the plug-in section (53) facing the insertion slot (31) has a guide inclined surface (55) facing the opening of the accommodating shell (1).

4. The conduit connection apparatus of claim 1, wherein, The catheter plug-in shell (3) is further provided with a rotation stopping tenon (32), and the accommodating shell (1) is provided with a tenon groove (11) matched with the rotation stopping tenon (32).

5. The conduit connection apparatus of claim 1, wherein, The number of limiting grooves (211) is two, and the two limiting grooves (211) are oppositely arranged; the number of limiting bosses (41) is also two, and the two limiting bosses (41) are oppositely arranged, the number of inclined helical surfaces (212) is four, the middle plane of the two limiting grooves (211) is taken as a symmetry plane, the two sides of the symmetry plane each have two inclined helical surfaces (212), the rotation directions of the two inclined helical surfaces (212) on each side are opposite, and the two inclined helical surfaces (212) on each side are connected to form a protruding tip outward, and the four inclined helical surfaces (212) are symmetrically arranged with respect to the longitudinal axis of the rotating sleeve (21).

6. The conduit connection device of any one of claims 1-5, wherein, The shell wall of the catheter plug-in shell (3) is provided with a damping ring (7), and the damping ring (7) is coaxially arranged with the catheter plug-in shell (3) and the accommodating shell (1) respectively, when the catheter plug-in shell (3) is completely plugged into the accommodating shell (1), the accommodating shell (1) is in interference fit with the damping ring (7).

7. An ultrasonic retraction system characterized by, The catheter connecting device comprises the catheter connecting device according to any one of claims 1-6.

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