A locking mechanism and medical tube assembly

Abstract

This utility model relates to the field of medical device technology and discloses a locking mechanism and a medical tube assembly. The locking mechanism includes: a connecting tube disposed at the proximal end of a delivery tube, the connecting tube having a through hole communicating with the delivery tube; a connecting seat, divided into a distal end and a proximal end, the distal end of the connecting seat connecting to the proximal end of an inner liner tube, the outer diameter of the distal end of the connecting seat being smaller than the inner diameter of the through hole, and the outer diameter of the proximal end of the connecting seat being larger than the inner diameter of the through hole; and a locking structure disposed between the connecting tube and the connecting seat, the locking structure being adapted to lock the connecting tube and the connecting seat. This utility model ensures that when the inner liner tube is inserted into the delivery tube, the distal end of the connecting seat can be smoothly inserted into the through hole, while the proximal end of the connecting seat cannot be inserted into the through hole and is located outside the connecting tube. Therefore, when it is necessary to remove the inner liner tube from the delivery tube, simply unlock the locking structure, and the proximal end of the connecting seat located at the tail end can be directly pulled out to easily remove the entire inner liner tube.

Description

Technical Field

[0001] This utility model relates to the field of extracorporeal circulation systems, specifically to a locking mechanism and a medical tube assembly. Background Technology

[0002] Extracorporeal circulation (ECG) is a technique used to temporarily replace heart and lung function during cardiac surgery, and intravenous cannulation is applied in ECG procedures. Current ECG intravenous cannulas consist of a delivery cannula and an inner liner. The delivery cannula has multiple drainage holes on its side wall for blood aspiration. Because the delivery cannula is relatively soft and blood vessels are often tortuous, it is difficult to insert it smoothly using only a guidewire. Therefore, when inserting the delivery cannula into a blood vessel, an inner liner must be inserted inside the delivery cannula, which then guides the delivery cannula to the target location.

[0003] When the inner liner moves the conveying pipe to the target position, in order to ensure that the far end of the conveying pipe is always abutted by the inner liner, an end cap is installed at the near end of the conveying pipe, thereby confining the inner liner inside the end cap. However, since the outer diameter of the inner liner is similar to the inner diameter of the conveying pipe, it is very inconvenient to remove the end cap and pull out the inner liner. Utility Model Content

[0004] In view of this, the present invention provides a locking mechanism and a medical tube assembly to solve the current problem of inconvenient separation of the inner liner tube and the delivery tube.

[0005] In a first aspect, this utility model provides a locking mechanism, comprising:

[0006] A connecting pipe is provided at the near end of the conveying pipe, and the connecting pipe is provided with a through hole that communicates with the conveying pipe;

[0007] The connecting seat is divided into a distal end and a proximal end. The distal end of the connecting seat is connected to the proximal end of the inner liner tube. The outer diameter of the distal end of the connecting seat is smaller than the inner diameter of the through hole, and the outer diameter of the proximal end of the connecting seat is larger than the inner diameter of the through hole.

[0008] A locking structure is provided between the connecting pipe and the connecting seat, and the locking structure is adapted to lock the connecting pipe and the connecting seat when the connecting seat is inserted into the through hole at the distal end of the connecting seat.

[0009] The beneficial effects of the above-mentioned locking mechanism are as follows: by setting the connecting seat into a far end and a near end, and making the outer diameter of the far end of the connecting seat smaller than the inner diameter of the through hole, and the outer diameter of the near end of the connecting seat larger than the inner diameter of the through hole, it is ensured that when the inner liner tube is inserted into the delivery tube, the far end of the connecting seat can be smoothly inserted into the through hole, while the near end of the connecting seat cannot be inserted into the through hole and is located outside the connecting tube. Therefore, when it is necessary to remove the inner liner tube from the delivery tube, after unlocking the locking structure, the near end of the connecting seat located at the tail can be directly pulled out to easily remove the entire inner liner tube without the need for additional tools or complicated steps, simplifying the disassembly process, making the disassembly of the inner liner tube more convenient, and reducing the difficulty of operation.

[0010] On the other hand, the outer diameter of the near end of the connector is larger than the inner diameter of the through hole, so that when the inner liner is inserted into the delivery pipe, the near end of the connector will not be inserted into the through hole, thus playing a limiting role and preventing the inner liner from being inserted into the delivery pipe too deeply.

[0011] In one alternative embodiment, the locking structure includes:

[0012] The first connecting part is provided on the inner wall of the through hole;

[0013] The second connecting part is disposed on the side wall of the far end of the connecting seat and is adapted to the first connecting part; the second connecting part has at least a first position and a second position. When the second connecting part is in the first position, the position of the second connecting part corresponds to that of the first connecting part, and the second connecting part slides with the first connecting part. When the second connecting part is in the second position, the second connecting part is placed in the through hole and is offset from the first connecting part.

[0014] The advantages of the above technical solution are as follows: locking and unlocking of the connecting tube and the connecting seat can be achieved with simple operation, which is very simple and ensures the firmness of the connection. After the tube is inserted, the connecting seat can be easily pulled out by simply adjusting the second connecting part to the first position, without the need for complicated disassembly tools or steps, thus improving disassembly efficiency.

[0015] In one alternative embodiment, the first connecting portion includes at least one slit, and the second connecting portion includes at least one protrusion. When the protrusion is in a first position, the protrusion corresponds to the position of the slit and can pass through the slit. When the protrusion is in a second position, the protrusion is placed in the through hole and offset from the slit. The protrusion abuts against the inner side of the proximal wall of the connecting tube, thereby restricting the movement of the inner liner tube towards the proximal end.

[0016] In one optional embodiment, the via is divided into a first via and a second via from the distal end to the proximal end, wherein the inner diameter of the first via is larger than the inner diameter of the second via.

[0017] The outer diameter of the distal end of the connector is smaller than the inner diameter of the second through hole, so that the distal end of the connector can pass through the first through hole and the second through hole.

[0018] The outer diameter of the proximal end of the connector is larger than the inner diameter of the second through hole, so that the proximal end of the connector cannot be inserted into the first through hole and the second through hole.

[0019] In one alternative embodiment, when the protrusion switches from the first position to the second position, the protrusion passes through the first through hole along the cut and is offset from the cut after rotation;

[0020] When the protrusion switches from the second position to the first position, the protrusion rotates to a position corresponding to the cut and then passes through the cut.

[0021] In one optional embodiment, a receiving groove is formed between the proximal end face of the protrusion, the side wall surface of the distal end of the connector between the protrusion and the proximal end of the connector, and the distal end face of the proximal end of the connector. When the protrusion is in the second position, the proximal end wall of the connector is accommodated in the receiving groove.

[0022] In one optional embodiment, a plurality of protrusions are arranged at axial intervals along the distal end of the connector, and the axial distance between two adjacent protrusions in the axial direction is greater than the axial length of the second through hole.

[0023] In one alternative embodiment, the protrusions are arranged in a plurality of axially spaced portions along the distal end of the connector.

[0024] The beneficial effects of the above technical solution are as follows: multiple protrusions allow the inner liner to be locked in different positions, thereby achieving multi-level adjustment of the delivery tube's extension length. Users can precisely control the insertion depth of the inner liner by selecting different protrusions to match the incision, meeting different clinical needs. By adjusting the position of the protrusions, various extension requirements can be achieved without changing the inner liner, simplifying the operation process and improving surgical efficiency.

[0025] In one alternative embodiment, the first connecting portion includes at least one protrusion, and the second connecting portion includes an annular groove and at least one slit. The annular groove is located near the proximal end of the slit and communicates with the slit. When the slit is in a first position, the protrusion corresponds to the position of the slit and can pass through the slit. When the slit is in a second position, the protrusion is placed in the annular groove and offset from the slit.

[0026] The advantages of the above technical solution are as follows: locking and unlocking of the connecting tube and the connecting seat can be achieved with simple operation, which is very simple and ensures the firmness of the connection. After the tube is inserted, the connecting seat can be easily pulled out by simply adjusting the incision to the second position, without the need for complicated disassembly tools or steps, thus improving disassembly efficiency.

[0027] In one optional embodiment, the first connecting portion includes at least one first protrusion and at least one first opening, and the second connecting portion includes an annular groove, at least one second protrusion and at least one second opening, wherein the annular groove is located at the proximal end of the second protrusion and the second opening, and the annular groove communicates with the second opening;

[0028] When the second protrusion and the second opening are in the first position, the first protrusion corresponds to the position of the second opening and can pass through the second opening, and the second protrusion corresponds to the position of the first opening and can pass through the first opening;

[0029] When the second protrusion and the second opening are in the second position, the second protrusion is placed inside the through hole and offset from the first opening, and the first protrusion is placed inside the annular groove and offset from the second opening.

[0030] Secondly, this utility model also provides a medical tube assembly, comprising:

[0031] The conveying pipe has a first configuration that extends axially and a second configuration that expands radially;

[0032] The inner liner tube can be inserted into the delivery tube from the proximal end of the delivery tube;

[0033] The aforementioned locking mechanism;

[0034] When the delivery pipe is in the first configuration, the inner liner is inserted into the delivery pipe and the two are locked together by a locking mechanism; when the delivery pipe is in the second configuration, the inner liner is withdrawn from the delivery pipe.

[0035] The beneficial effects of the aforementioned medical tubing assembly are as follows: by inserting the inner liner into the delivery tube, allowing the delivery tube to extend, and then inserting it into the blood vessel, the delivery tube can be positioned accurately even in tortuous blood vessels. Because the delivery tube expands radially after insertion into the blood vessel, the lumen of the delivery tube is enlarged, resulting in a large suction flow rate during operation and full utilization of the lumen size.

[0036] In one alternative embodiment, the axial length of the first configuration is greater than the axial length of the second configuration, and the outer diameter of the first configuration is smaller than the outer diameter of the second configuration.

[0037] The beneficial effects of the above technical solution are as follows: In the first configuration, the axial length of the delivery tube is relatively long, allowing it to extend better within the blood vessel. Simultaneously, the smaller outer diameter of the first configuration facilitates the passage of the delivery tube through narrow vascular areas, reducing damage to the patient's vascular wall. When the delivery tube is converted to the second configuration, its outer diameter increases, and the lumen expands accordingly, thereby increasing the aspiration flow rate.

[0038] In one optional embodiment, the delivery tube is divided into a first tube body, a second tube body, and a third tube body that are interconnected from the distal end to the proximal end. The side wall of the first tube body is provided with a first suction hole that communicates with its inner cavity, and the side wall of the second tube body is provided with a second suction hole that communicates with its inner cavity.

[0039] In one alternative embodiment, the outer diameter of the first tube gradually decreases from the proximal end to the distal end.

[0040] In one optional embodiment, the first tube is divided into a first tube segment C and a first tube segment D from the distal end to the proximal end. A through hole is provided on the first tube segment C, and the inner diameter of the first tube segment D is larger than the inner diameter of the through hole, so that a limiting step is formed between the first tube segment C and the first tube segment D.

[0041] The beneficial effects of the above technical solution are as follows: the distal end of the inner liner tube fits with the limiting step inside the delivery tube, stretching the delivery tube. This utility model completely embeds the distal end of the inner liner tube inside the delivery tube, thereby avoiding the situation where the distal end of the inner liner tube is set as a sharp cone shape, and avoiding damage to the blood vessel when the device is inserted into the blood vessel.

[0042] In one optional embodiment, the first suction hole is disposed on the first tube body section D. The first tube body section D and the second tube body are a winding component, a mesh braiding component, a tubular cutting component, or a carving component, thereby enlarging the formed suction hole. Even if the tube body is attached to the blood vessel, there will still be a blood flow gap between the suction hole and the blood vessel wall, which can ensure the blood suction efficiency.

[0043] In one optional embodiment, the first tube segment C is divided into a first tube segment C1 and a first tube segment C2 from the distal end to the proximal end. The first tube segment C1 is a single-layer elastic tube, and the first tube segment C2 is a multi-layer hardened tube and includes at least one first reinforcing layer.

[0044] In one alternative embodiment, the third tube is a multi-layer tube and includes at least one second reinforcing layer.

[0045] In one alternative embodiment, the wall thickness of the third tube is the same or gradually increases from the distal end to the proximal end. When the wall thickness of the third tube gradually increases from the distal end to the proximal end, the compressive strength of the proximal end can be significantly improved.

[0046] In one alternative embodiment, the connection between the distal end face of the first tube and the side wall is set as an arc-shaped transition section, thereby avoiding scratching the blood vessel when it comes into contact with the inner wall of the blood vessel. Attached Figure Description

[0047] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0048] Figure 1 A schematic diagram of the connection structure between the delivery tube and the connecting tube in the medical tube assembly provided by this utility model;

[0049] Figure 2 A schematic diagram of the connection structure between the inner liner tube and the connecting seat in the medical tube assembly provided in Embodiment 1 of this utility model;

[0050] Figure 3 A schematic diagram of the delivery tube in the medical tube assembly provided by this utility model;

[0051] Figure 4 This utility model Figure 3 Sectional view along line AA in the middle;

[0052] Figure 5 This utility model Figure 3 BB-direction sectional view in the middle;

[0053] Figure 6 A schematic diagram of the connecting tube in the medical tube assembly provided by this utility model;

[0054] Figure 7 A side view of the connecting tube in the medical tube assembly provided by this utility model;

[0055] Figure 8 Another structural schematic diagram of the connector in the medical tube assembly provided in Embodiment 1 of this utility model;

[0056] Figure 9 A schematic diagram of the delivery tube in the medical tube assembly provided in Embodiment 1 of this utility model before stretching;

[0057] Figure 10 A schematic diagram of the delivery tube in the medical tube assembly provided in Embodiment 1 of this utility model after being stretched;

[0058] Figure 11A side view of the connecting tube in the medical tube assembly provided in Embodiment 2 of this utility model;

[0059] Figure 12 This is a schematic diagram of the structure of the inner liner tube in the medical tube assembly provided in Embodiment 2 of this utility model;

[0060] Figure 13 This is a schematic diagram of the structure of the medical tube assembly provided in Embodiment 2 of the present invention when the incision is in the first position after the inner liner tube is connected to the connecting seat;

[0061] Figure 14 This is a schematic diagram of the structure of the medical tube assembly provided in Embodiment 2 of the present invention when the incision is in the second position after the inner liner tube is connected to the connecting seat;

[0062] Figure 15 A side view of the connecting tube in the medical tube assembly provided in Embodiment 3 of this utility model;

[0063] Figure 16 This is a schematic diagram of the structure of the inner liner tube in the medical tube assembly provided in Embodiment 3 of this utility model;

[0064] Figure 17 This is a schematic diagram of the structure of the medical tube assembly provided in Embodiment 3 of the present invention when the second protrusion and the second opening are in the first position after the inner liner tube is connected to the connecting seat.

[0065] Figure 18 This is a schematic diagram of the structure of the medical tube assembly provided in Embodiment 3 of this utility model when the inner liner tube is connected to the connecting seat and the second protrusion and the second opening are in the second position.

[0066] Explanation of reference numerals in the attached figures:

[0067] 1. Conveying pipe; 11. First pipe body; 111. Through hole; 112. First pipe body section C; 1121. First pipe body section C1; 1122. First pipe body section C2; 113. First pipe body section D; 114. First suction hole; 115. First reinforcing layer; 12. Second pipe body; 121. Second suction hole; 13. Third pipe body; 131. Second reinforcing layer; 132. Inner tube of the third pipe body; 133. Outer tube of the third pipe body; 14. Limiting step;

[0068] 2. Inner lining tube;

[0069] 3. Connecting pipe; 31. Through hole; 311. First through hole; 312. Second through hole; 32. Cut; 33. Proximal end wall of connecting pipe; 34. Inner side of proximal end wall of connecting pipe.

[0070] 4. Connecting seat; 41. Distal end of connecting seat; 42. Proximal end of connecting seat; 421. Distal end face of the proximal end of connecting seat; 43. Protrusion; 431. Proximal end face of protrusion; 44. Receiving groove; 45. First protrusion; 46. First opening; 47. Second protrusion; 48. Second opening; 49. Annular groove. Detailed Implementation

[0071] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0072] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the term "distal" generally refers to the end of the medical implant furthest from the operator; "proximal," the opposite of "distal," refers to the end of the medical implant closer to the operator; the term "distal surface" refers to the surface located at the distal end; the term "distal end portion" refers to the location located at the distal end; the term "proximal wall" refers to the side wall near the proximal end; the term "radial" refers to the direction perpendicular to the axis of the medical implant; and the term "axial" refers to the direction coaxial with the axis of the medical implant. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0073] The specific embodiments of this utility model are described in detail below with reference to the locking mechanism of the first aspect of this utility model and the medical tube assembly of the second aspect of this utility model.

[0074] Example 1

[0075] Combination Figures 1 to 10 As shown, according to an embodiment of the present invention, in a first aspect, a locking mechanism is provided, including a connecting pipe 3, a connecting seat 4, and a locking structure. The connecting pipe 3 is disposed at the proximal end of the conveying pipe 1, and a through hole 31 communicating with the conveying pipe 1 is provided on the connecting pipe 3. The connecting seat 4 is divided into a distal end 41 and a proximal end 42. The distal end 41 is connected to the proximal end of the inner liner pipe 2. The outer diameter of the distal end 41 is smaller than the inner diameter of the through hole 31, and the outer diameter of the proximal end 42 is larger than the inner diameter of the through hole 31.

[0076] A locking structure is installed between the connecting pipe 3 and the connecting seat 4. After the inner liner 2 is inserted into the delivery pipe 1 and moves axially towards the distal end of the delivery pipe 1, the distal end 41 of the connecting seat is inserted into the through hole 31, and the locking structure locks the connecting pipe 3 and the connecting seat 4. The locking structure, located between the connecting pipe 3 and the connecting seat 4, can lock both during insertion, preventing accidental dislodgement. During insertion, the locking structure connects the connecting pipe 3 and the connecting seat 4, effectively pushing the delivery pipe 1 to the target position while ensuring that the distal end of the delivery pipe 1 is always abutted by the inner liner 2, improving its positioning accuracy and avoiding deviation or jamming problems caused by the softness of the delivery pipe.

[0077] The aforementioned medical tube assembly, by setting the connector 4 into a distal end 41 and a proximal end 42, and ensuring that the outer diameter of the distal end 41 is smaller than the inner diameter of the through hole 31, while the outer diameter of the proximal end 42 is larger than the inner diameter of the through hole 31, ensures that when the inner liner tube 2 is inserted into the delivery tube 1, the distal end 41 can be smoothly inserted into the through hole 31, while the proximal end 42 cannot be inserted into the through hole 31 and is located outside the connecting tube 3. Therefore, when it is necessary to remove the inner liner tube 2 from the delivery tube 1, after unlocking the locking structure, the proximal end 42 of the connector located at the tail can be directly pulled out to easily remove the entire inner liner tube 2 without the need for additional tools or complicated steps, simplifying the disassembly process, making the disassembly of the inner liner tube 2 more convenient, and reducing the difficulty of operation.

[0078] On the other hand, the outer diameter of the near end 42 of the connector is larger than the inner diameter of the through hole 31, so that when the inner liner tube 2 is inserted into the conveying pipe 1, the near end 42 of the connector will not be inserted into the through hole 31, thereby playing a limiting role and preventing the inner liner tube 2 from being inserted into the conveying pipe 1 too deeply.

[0079] In some embodiments, combined with Figure 6 As shown, the through-hole 31 is divided into a first through-hole 311 and a second through-hole 312 from the distal end to the proximal end. The inner diameter of the first through-hole 311 is larger than the inner diameter of the second through-hole 312. The second through-hole 312 is formed on the proximal wall 33 of the connecting pipe. The outer diameter of the distal end 41 of the connecting seat is smaller than the inner diameter of the second through-hole 312, so that the distal end 41 of the connecting seat can pass through the first through-hole 311 and the second through-hole 312. The outer diameter of the proximal end 42 of the connecting seat is larger than the inner diameter of the second through-hole 312, so that the proximal end 42 of the connecting seat cannot pass through the first through-hole 311 and the second through-hole 312, thereby playing a limiting role when the inner liner 2 is inserted into the delivery pipe 1.

[0080] In some embodiments, the locking structure includes a first connecting portion and a second connecting portion. The first connecting portion is disposed on the inner wall of the through hole 31. The second connecting portion is disposed on the side wall of the distal end 41 of the connecting seat and is adapted to the first connecting portion. The second connecting portion has at least a first position and a second position. When the second connecting portion is in the first position, the second connecting portion corresponds to the position of the first connecting portion and the second connecting portion is slidably engaged with the first connecting portion. When the second connecting portion is in the second position, the second connecting portion is placed inside the through hole 31 and offset from the first connecting portion.

[0081] More specifically, combined Figure 7 As shown, the first connecting portion includes at least one cutout 32, which is formed on the inner wall of the second through hole 312. The second connecting portion includes at least one protrusion 43, which is disposed on the side wall of the distal end 41 of the connecting seat and adapted to the cutout 32. The protrusion 43 has at least a first position and a second position. When the protrusion 43 is in the first position, the protrusion 43 corresponds to the position of the cutout 32 and can pass through the cutout 32, so that the distal end 41 of the connecting seat can be smoothly inserted into or withdrawn from the connecting tube 3. When the protrusion 43 is in the second position, the protrusion 43 is placed in the first through hole 311 and offset from the cutout 32. At this time, the protrusion 43 abuts against the inner side surface 34 of the proximal end wall of the connecting tube, thus restricting the movement of the inner liner tube 2 towards the proximal end.

[0082] When the protrusion 43 switches from the first position to the second position, the protrusion 43 passes through the first through hole 311 along the cut 32 and then rotates to offset from the cut 32, at which point the locking structure is in the locked state. When the protrusion 43 switches from the second position to the first position, the protrusion 43 rotates to the position corresponding to the cut 32 and then passes through the cut 32, at which point the locking structure is in the unlocked state. In this embodiment, locking and unlocking of the connecting tube 3 and the connecting seat 4 can be achieved with simple operation, which is very simple and ensures the firmness of the connection. After the tube is inserted, the connecting seat 4 can be easily pulled out by simply adjusting the protrusion 43 to the first position, without the need for complicated disassembly tools or steps, thus improving disassembly efficiency.

[0083] More specifically, the connecting tube 3 can be made of silicone or other elastomers, and has a tapered design at the proximal end. The cutout 32 can be rectangular, polygonal, or other shapes.

[0084] In some embodiments, combined with Figure 2 As shown, a receiving groove 44 is formed between the proximal end face 431 of the protrusion, the side wall surface of the distal end face 41 of the connector, and the distal end face 421 of the proximal end face of the connector. The side wall surface of the distal end face 41 of the connector is located between the protrusion 43 and the proximal end face 42 of the connector. When the protrusion 43 is in the second position, the proximal end wall 33 of the connector is accommodated in the receiving groove 44.

[0085] If only one protrusion 43 is arranged along the axial direction of the distal end 41 of the connector, when the protrusion 43 is inserted into the cut 32 and misaligned with the cut 32, the length of the inner liner 2 extending into the conveying pipe 1 is limited. When it is necessary to change the extension length of the conveying pipe 1, it is also necessary to replace it with an inner liner 2 of another length. In order for one inner liner 2 to meet the various extension requirements of the conveying pipe 1, in some embodiments, combined with Figure 8 As shown, multiple protrusions 43 are arranged at axial intervals along the distal end 41 of the connecting seat, and the axial distance between two adjacent protrusions 43 in the axial direction is greater than the axial length of the second through hole 312.

[0086] Since multiple protrusions 43 are arranged at axial intervals along the distal end 41 of the connector, each protrusion 43 is located on the same axis. When one of the protrusions 43 is aligned with the cutout 32, the remaining protrusions coaxial with that protrusion 43 will also be aligned with the cutout 32.

[0087] In this embodiment, multiple protrusions 43 allow the inner liner 2 to be locked in different positions, thereby enabling multi-level adjustment of the extension length of the delivery tube 1. Users can precisely control the insertion depth of the inner liner 2 by selecting different protrusions 43 to cooperate with the incision 32, meeting different clinical needs. By adjusting the position of the protrusions 43, various extension requirements can be achieved without changing the inner liner, simplifying the operation process and improving surgical efficiency.

[0088] Example 2

[0089] Combination Figures 11 to 14 As shown, based on Embodiment 1, this utility model provides a locking mechanism. The difference between this embodiment and Embodiment 1 is that the specific structures of the first connecting part and the second connecting part are different from those in Embodiment 1.

[0090] In this embodiment, the first connecting part includes at least one protrusion 43, and the second connecting part includes an annular groove 49 and at least one cut 32. The annular groove 49 is located near the end of the cut 32 and communicates with the cut 32. When the cut 32 is in the first position, the protrusion 43 corresponds to the position of the cut 32 and can pass through the cut 32. When the cut 32 is in the second position, the protrusion 43 is placed in the annular groove 49 and is offset from the cut 32.

[0091] In this embodiment, locking and unlocking the connecting tube and the connector can be achieved with a simple operation, which is very simple and ensures a firm connection. After inserting the tube, simply adjust the incision to the second position to easily pull out the connector, without the need for complicated disassembly tools or steps, thus improving disassembly efficiency.

[0092] Example 3

[0093] Combination Figures 15 to 18 As shown, based on Embodiment 1, this utility model provides a locking mechanism. The difference between this embodiment and Embodiment 1 is that the specific structures of the first connecting part and the second connecting part are different from those in Embodiment 1.

[0094] In this embodiment, the first connecting portion includes at least one first protrusion 45 and at least one first opening 46, and the second connecting portion includes an annular groove 49, at least one second protrusion 47 and at least one second opening 48. The annular groove 49 is located near the second protrusion 47 and the second opening 48, and the annular groove 49 communicates with the second opening 48.

[0095] When the second protrusion 47 and the second opening 48 are in the first position, the first protrusion 45 corresponds to the position of the second opening 48 and can pass through the second opening 48, and the second protrusion 47 corresponds to the position of the first opening 46 and can pass through the first opening 46.

[0096] When the second protrusion 47 and the second opening 48 are in the second position, the second protrusion 47 is placed inside the through hole 31 and offset from the first opening 46, and the first protrusion 45 is placed inside the annular groove 49 and offset from the second opening 48.

[0097] In this embodiment, the locking mechanism achieves the locking and unlocking functions of the connecting pipe and the connecting seat through the cooperation of the first protrusion, the first opening, the second protrusion, and the second opening. When it is necessary to lock the connecting pipe and the connecting seat, simply pass the first protrusion through the second opening, and simultaneously pass the second protrusion through the first opening, to achieve initial locking. Subsequently, by adjusting the positions of the second protrusion and the second opening to the second position, the locking firmness can be further increased, preventing the connecting pipe from accidentally falling off.

[0098] Furthermore, the locking mechanism in this embodiment is characterized by its simple structure and convenient operation. Users do not need to use complicated disassembly tools or procedures; they can simply adjust the position of the second protrusion and the second opening to unlock and disassemble the connecting pipe and the connecting seat, greatly improving efficiency.

[0099] Example 4

[0100] Combination Figures 1 to 18As shown, according to an embodiment of the present invention, in a second aspect, a medical tubing assembly is provided. This medical tubing assembly is a blood delivery tubing assembly used in extracorporeal circulation systems to establish a temporary extracorporeal circulation pathway in specific surgical scenarios. The medical tubing assembly includes a delivery tube 1, an inner liner tube 2, and any of the locking mechanisms in embodiments 1-3. The delivery tube 1 is a variable-diameter tube that can be axially stretched; after the stretching force is removed, the delivery tube can spring back to its original size. The delivery tube 1 has a first configuration that extends axially and a second configuration that expands radially. The first configuration of the delivery tube 1 is as follows: Figure 10 As shown, the second configuration of the conveying pipe 1 is as follows: Figure 1 As shown. The inner liner 2 can be inserted into the delivery pipe 1 from the proximal end of the delivery pipe. When the delivery pipe 1 is in the first configuration, the inner liner 2 is inserted into the delivery pipe 1 and the two are locked by a locking mechanism. When the delivery pipe 1 is in the second configuration, the inner liner 2 is withdrawn from the delivery pipe 1. When the inner liner 2 is inserted into the delivery pipe 1, the inner liner 2 causes the delivery pipe 1 to extend axially, and the delivery pipe 1 changes from the second configuration to the first configuration. When the inner liner 2 is withdrawn from the delivery pipe 1, the delivery pipe 1 changes from the first configuration to the second configuration.

[0101] In this embodiment, the inner liner tube 2 is inserted into the delivery tube 1, which is then extended before being inserted into the blood vessel. Even in tortuous blood vessels, the delivery tube 1 can be positioned very accurately. Because the delivery tube 1 expands radially after being inserted into the blood vessel, the lumen of the delivery tube 1 is enlarged, thereby increasing the suction flow rate during operation and making full use of the lumen size.

[0102] More specifically, the axial length of the first configuration is greater than that of the second configuration, and the outer diameter of the first configuration is smaller than that of the second configuration. In the first configuration, the axial length of the delivery tube 1 is relatively long, allowing it to extend better within the blood vessel. Simultaneously, the smaller outer diameter of the first configuration facilitates the passage of the delivery tube 1 through narrow vascular areas, reducing damage to the patient's vascular wall. When the delivery tube 1 is converted to the second configuration, its outer diameter increases, and the lumen expands accordingly, thereby increasing the aspiration flow rate.

[0103] In some embodiments, combined with Figure 3 As shown, the delivery pipe 1 is divided into a first pipe body 11, a second pipe body 12, and a third pipe body 13, which are interconnected from the distal end to the proximal end. A first suction hole 114 communicating with its inner cavity is provided on the side wall of the first pipe body 11, and a second suction hole 121 communicating with its inner cavity is provided on the side wall of the second pipe body 12. The shapes of the first suction hole 114 and the second suction hole 121 can be the same or different. The shape and size of the first suction hole 114 and the second suction hole 121 can be set according to requirements.

[0104] In some embodiments, the outer diameter of the first tube 11 gradually decreases from the proximal end to the distal end. More specifically, the first tube 11 is configured as a conical shape.

[0105] Currently, in order for the delivery tube 1 to be inserted into a blood vessel, an inner liner 2 needs to extend from the distal end of the delivery tube 1. The distal end of the inner liner 2 is often designed as a pointed cone. However, when the inner liner 2 and the delivery tube 1 move within the blood vessel, the distal end of the inner liner 2 can scratch the blood vessel. In some embodiments, the first tube body 11 is divided into a first tube body segment C 112 and a first tube body segment D 113 from the distal end to the proximal end. The first tube body segment C 112 is provided with a through hole 111, which allows a guide wire to pass through it. The inner diameter of the first tube body segment D 113 is larger than the inner diameter of the through hole 111, so that a limiting step 14 is formed between the first tube body segment C 112 and the first tube body segment D 113. The outer diameter of the distal end of the inner liner 2 is larger than the inner diameter of the through hole 111, and the outer diameter of the distal end of the inner liner 2 is smaller than the inner diameter of the first tube body segment D 113. Therefore, when the inner liner 2 is inserted into the medical device, it is limited by the limiting step 14.

[0106] In this embodiment, the distal end of the inner liner tube is fitted with the limiting step 14 inside the delivery tube, stretching the delivery tube 1. In this embodiment, the distal end of the inner liner tube 2 is completely embedded inside the delivery tube 1, thereby avoiding the situation where the distal end of the inner liner tube is set as a sharp cone shape, and avoiding damage to the blood vessel when the device is inserted into the blood vessel.

[0107] Furthermore, the limiting step 14 is a plane perpendicular to the axis of the conveying pipe 1, and the far end face of the inner liner is a plane perpendicular to the axis of the inner liner 2. Thus, when the inner liner 2 pushes the conveying pipe 1 to extend, the conveying pipe 1 can extend completely along its axis.

[0108] The suction holes on the current delivery tube 1 are relatively small, resulting in low blood flow and velocity, making it impossible to fully utilize the lumen. Furthermore, during operation, the tube may adhere to the wall, obstructing the side suction holes and affecting suction efficiency. To address this issue, in some embodiments, the first tube segment D 113 and the second tube 12 are provided with metal reinforcing layers. The first suction hole 114 is located on the first tube segment D 113. The metal reinforcing layers of the first tube segment D 113 and the second tube 12 are either wound components, mesh braided components, tubular cut components, or engraved components, thereby enlarging the formed suction holes. Even when the tube adheres to the blood vessel, a blood flow gap remains between the suction hole and the blood vessel wall, ensuring efficient blood suction.

[0109] When the first tube body D segment 113 and the second tube body 12 are winding components, the first tube body D segment 113 and the second tube body 12 can be wound by a coiling spring or a spring.

[0110] When the first tube body D segment 113 and the second tube body 12 are mesh braided components, the first tube body D segment 113 and the second tube body 12 can be made of round wires, flat wires or other shaped wires of Niti or stainless steel and other materials by weaving and coiling.

[0111] Meanwhile, the first tube section D 113 and the second tube 12 can also be made by cutting patterns on Niti or stainless steel hyaluronic acid tubes. A first suction hole 114 is cut on the first tube section D 113 and a second suction hole 121 is cut on the second tube 12.

[0112] In some embodiments, the first tube segment C 112 is divided into a first tube segment C1 1121 and a first tube segment C2 1122 from the distal end to the proximal end. The first tube segment C1 1121 is a single-layer elastic tube. By making the first tube segment C1 1121 elastic, it is made of polymer material and has through holes to avoid scratching blood vessels. The first tube segment C2 1122 is a multi-layer hardened tube and includes at least one first reinforcing layer 115 to prevent deformation after the inner liner tube 2 is inserted, thus preventing it from affecting its normal use. In a specific embodiment, the first tube segment C2 1122 can be a three-layer tube, consisting of an inner polymer layer, a metal reinforcing layer, and an outer polymer layer from the inside out. The inner polymer layer can be filled with polymer material or injection molded material.

[0113] In some embodiments, the third tube 13 is a multilayer tube and includes at least one second reinforcing layer 131. In one specific embodiment, combined with Figure 4 As shown, the third tube 13 consists of three layers, from the inside out: an inner tube 132, a second reinforcing layer 131, and an outer tube 133. The inner tube 132 can be made of a polymer material (TPU, PEBAX, silicone, or other materials with equivalent properties). The second reinforcing layer 131 can be made of round, flat, or other shaped wires from Niti or stainless steel and other materials, through weaving and coiling, or it can be achieved by cutting patterns from Niti or stainless steel hyaluronic acid tubing. The outer tube 133 is made of a polymer material.

[0114] The inner liner tube 2 is mainly made of polymer materials or metal tubes or composite tubes, and its shape is a through hole of equal diameter or a through hole of varying diameter.

[0115] The distal end 41 of the connector can be connected to the proximal end of the inner liner tube 2 by adhesive bonding, or other connection methods can be used.

[0116] In some embodiments, the wall thickness of the third tube 13 is the same from the distal end to the proximal end, which facilitates processing and production.

[0117] As an alternative embodiment, the third tube 13 has a gradually thickened wall from the distal end to the proximal end. This design can significantly improve the pressure resistance of the proximal end. Since the proximal end usually bears greater external forces (such as connection, fixation, etc.), the thickened wall can better resist external pressure and prevent the tube from cracking or deforming.

[0118] In some embodiments, the connection between the distal end face of the first tube 11 and the sidewall is provided as an arc-shaped transition section, so that the distal end of the first tube 11 is rounded, thereby avoiding scratching the blood vessel when it comes into contact with the inner wall of the blood vessel.

[0119] The working process of the above-mentioned medical tubing components is as follows:

[0120] Before work (i.e. before stretching), combined with Figure 9 As shown, the delivery pipe 1 and the inner liner pipe 2 are separate components.

[0121] When working, combine Figure 10 As shown, the inner liner tube 2 is inserted into the conveying pipe 1, with its distal end abutting against the limiting step 14. The axes of the inner liner tube 2 and the conveying pipe 1 are coaxial. Pushing the connecting seat 4 pushes the conveying pipe 1 to its distal end, stretching the entire conveying pipe 1 and lowering its overall outer diameter, causing it to fit tightly against the inner liner tube 2. The protrusion 43 enters the first through hole 311 from the cut 32. Rotating the connecting seat 4 causes the inner liner tube 2 and the protrusion 43 to rotate, misaligning the protrusion 43 with the cut 32, thus achieving a locking connection between the inner liner tube 2 and the conveying pipe 1. A guide wire is inserted into the device, and the device is conveyed to the target position via the guide wire.

[0122] Upon reaching the target area, rotate the connecting seat 4 so that the protrusion 43 aligns with the cut 32, remove the inner liner 2, and the delivery tube 1 springs back to its original size. Connect the proximal end of the delivery tube to the extracorporeal circulation device and work in conjunction with the proximal extracorporeal circulation device. After completion, remove the entire delivery tube 1 from the body.

[0123] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A locking mechanism, characterized in that, include: A connecting pipe (3) is provided at the near end of the conveying pipe (1), and the connecting pipe (3) is provided with a through hole (31) that communicates with the conveying pipe (1); The connecting seat (4) is divided into a connecting seat distal end (41) and a connecting seat proximal end (42). The connecting seat distal end (41) is connected to the proximal end of the inner liner tube (2). The outer diameter of the connecting seat distal end (41) is smaller than the inner diameter of the through hole (31), and the outer diameter of the connecting seat proximal end (42) is larger than the inner diameter of the through hole (31). A locking structure is provided between the connecting pipe (3) and the connecting seat (4), the locking structure being adapted to lock the connecting pipe (3) and the connecting seat (4) when the connecting seat is inserted into the through hole (31) at the distal end (41) of the connecting seat.

2. The locking mechanism according to claim 1, characterized in that, The locking structure includes: The first connecting part is provided on the inner wall of the through hole (31); The second connecting part is disposed on the side wall of the far end (41) of the connecting seat and is adapted to the first connecting part; the second connecting part has at least a first position and a second position. When the second connecting part is in the first position, the position of the second connecting part corresponds to that of the first connecting part, and the second connecting part slides with the first connecting part. When the second connecting part is in the second position, the second connecting part is placed in the through hole (31) and is offset from the first connecting part.

3. The locking mechanism according to claim 2, characterized in that, The first connecting part includes at least one cut (32), and the second connecting part includes at least one protrusion (43). When the protrusion (43) is in the first position, the position of the protrusion (43) corresponds to that of the cut (32) and can pass through the cut (32). When the protrusion (43) is in the second position, the protrusion (43) is placed in the through hole (31) and offset from the cut (32). The protrusion (43) abuts against the inner side surface (34) of the proximal wall of the connecting tube, thereby restricting the proximal movement of the inner liner tube (2).

4. The locking mechanism according to claim 3, characterized in that, The via (31) is divided into a first via (311) and a second via (312) from the distal end to the proximal end, and the inner diameter of the first via (311) is larger than the inner diameter of the second via (312). The outer diameter of the distal end (41) of the connector is smaller than the inner diameter of the second through hole (312) so that the distal end (41) of the connector can pass through the first through hole (311) and the second through hole (312); The outer diameter of the proximal end (42) of the connector is larger than the inner diameter of the second through hole (312) so that the proximal end (42) of the connector cannot pass through the first through hole (311) and the second through hole (312).

5. The locking mechanism according to claim 4, characterized in that, When the protrusion (43) switches from the first position to the second position, the protrusion (43) passes through the first through hole (311) along the cut (32) and is offset from the cut (32) after rotation; When the protrusion (43) switches from the second position to the first position, the protrusion (43) rotates to a position corresponding to the cut (32) and then passes through the cut (32).

6. The locking mechanism according to claim 3, characterized in that, A receiving groove (44) is formed between the proximal end face (431) of the protrusion, the side wall of the distal end face (41) of the connector between the protrusion (43) and the proximal end face (421) of the connector, and the distal end face (421) of the proximal end face of the connector. When the protrusion (43) is in the second position, the proximal end wall (33) of the connector is accommodated in the receiving groove (44).

7. The locking mechanism according to any one of claims 4-6, characterized in that, The protrusions (43) are arranged in multiple axially spaced along the far end (41) of the connecting seat, and the axial distance between two adjacent protrusions (43) in the axial direction is greater than the axial length of the second through hole (312).

8. The locking mechanism according to claim 2, characterized in that, The first connecting portion includes at least one protrusion (43), and the second connecting portion includes an annular groove (49) and at least one cut (32). The annular groove (49) is located near the end of the cut (32) and communicates with the cut (32). When the cut (32) is in a first position, the protrusion (43) corresponds to the position of the cut (32) and can pass through the cut (32). When the cut (32) is in a second position, the protrusion (43) is placed in the annular groove (49) and is offset from the cut (32).

9. The locking mechanism according to claim 2, characterized in that, The first connecting portion includes at least one first protrusion (45) and at least one first opening (46), and the second connecting portion includes an annular groove (49), at least one second protrusion (47) and at least one second opening (48). The annular groove (49) is located at the proximal end of the second protrusion (47) and the second opening (48), and the annular groove (49) communicates with the second opening (48). When the second protrusion (47) and the second opening (48) are in the first position, the first protrusion (45) corresponds to the second opening (48) and can pass through the second opening (48), and the second protrusion (47) corresponds to the first opening (46) and can pass through the first opening (46). When the second protrusion (47) and the second opening (48) are in the second position, the second protrusion (47) is placed in the through hole (31) and offset from the first opening (46), and the first protrusion (45) is placed in the annular groove (49) and offset from the second opening (48).

10. A medical tubing assembly, characterized in that, include: The conveying pipe (1) has a first configuration that extends axially and a second configuration that expands radially; The inner liner (2) can be inserted into the delivery pipe (1) from the proximal end of the delivery pipe; The locking mechanism according to any one of claims 1-9; When the conveying pipe (1) is in the first configuration, the inner liner (2) is inserted into the conveying pipe (1) and the two are locked together by a locking mechanism; when the conveying pipe (1) is in the second configuration, the inner liner (2) is withdrawn from the conveying pipe (1).

11. The medical tubing assembly according to claim 10, characterized in that, The axial length of the first configuration is greater than the axial length of the second configuration, and the outer diameter of the first configuration is smaller than the outer diameter of the second configuration.

12. The medical tubing assembly according to claim 10, characterized in that, The delivery tube (1) is divided into a first tube body (11), a second tube body (12) and a third tube body (13) that are connected to each other from the far end to the near end. The first tube body (11) has a first suction hole (114) that communicates with its inner cavity on its side wall, and the second tube body (12) has a second suction hole (121) that communicates with its inner cavity on its side wall.

13. The medical tubing assembly according to claim 12, characterized in that, The outer diameter of the first tube (11) gradually decreases from the proximal end to the distal end.

14. The medical tubing assembly according to claim 12, characterized in that, The first tube (11) is divided into a first tube C segment (112) and a first tube D segment (113) from the distal end to the proximal end. A through hole (111) is provided on the first tube C segment (112). The inner diameter of the first tube D segment (113) is larger than the inner diameter of the through hole (111) so that a limiting step (14) is formed between the first tube C segment (112) and the first tube D segment (113).

15. The medical tubing assembly according to claim 14, characterized in that, The first suction hole (114) is disposed on the first tube body D section (113), and the first tube body D section (113) and the second tube body (12) are winding components, mesh braiding components, tubular cutting components or engraving components.

16. The medical tubing assembly according to any one of claims 12-15, characterized in that, The wall thickness of the third tube (13) is the same or gradually increases from the distal end to the proximal end.

17. The medical tubing assembly according to any one of claims 12-15, characterized in that, The connection between the distal end face and the side wall of the first tube (11) is set as an arc-shaped transition section.

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