Guide wire conveying assembly

Abstract

The guide wire conveying assembly comprises a guide wire and an outer sheath tube, a guide wire cavity, a blood drawing channel and an inflation channel are arranged in the outer sheath tube, the guide wire cavity penetrates through the two ends of the outer sheath tube in the extending direction of the outer sheath tube, the blood drawing channel extends in the extending direction of the outer sheath tube, and the inflation channel is communicated with the guide wire cavity. A blood drawing opening is formed in the far end of the outer sheath tube, the blood drawing channel is communicated with the blood drawing opening, an air bag is connected to the outer sheath tube, the inflation channel extends in the extending direction of the outer sheath tube and is communicated with the air bag, and the blood drawing opening is located in the far end side of the air bag. The distance between the air bag and the far end of the outer sheath tube is 3-8 mm. When the guide wire penetrates through the vein valve, the vein valve can be controlled to be opened, so that the guide wire can pass through the vein valve in a lossless mode, it is guaranteed that the guide wire cannot damage the vein valve, and the effect of an interventional operation is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a guide wire delivery assembly. Background Art

[0002] For some interventional surgeries (such as venous thrombectomy), the guidewire passes through the vein. There are venous valves in the local veins. When passing through the venous valve, the guidewire must pass through at the moment when the venous valve opens. However, the time window for the opening of the venous valve is still difficult to grasp. Therefore, in actual clinical practice, when the guidewire passes through the venous valve, the operator's experience is often relied upon, which may cause the guidewire to puncture the venous valve. In severe cases, the venous valve may be damaged, which may cause venous reflux in the vein. Summary of the invention

[0003] In view of this, the present invention provides a guidewire delivery assembly, which facilitates the insertion of the guidewire in the vein. When the guidewire passes through the venous valve, the venous valve can be controlled to open, so that the guidewire can pass through the venous valve without damage, ensuring that the guidewire will not damage the venous valve, thereby improving the effect of interventional surgery.

[0004] The technical solution adopted by the present invention is: A guidewire delivery assembly, comprising a guidewire and an outer sheath tube, wherein a guidewire cavity, a blood drawing channel and an inflation channel are arranged in the outer sheath tube, the guidewire cavity passes through both ends of the outer sheath tube along the extension direction of the outer sheath tube, the blood drawing channel extends along the extension direction of the outer sheath tube, a blood drawing port is arranged at the distal end of the outer sheath tube, the blood drawing channel is communicated with the blood drawing port, an air bag is connected to the outer sheath tube, the inflation channel extends along the extension direction of the outer sheath tube, the inflation channel is communicated with the air bag, and the blood drawing port is located at the distal end side of the air bag; The distance between the airbag and the distal end of the outer sheath is 3-8 mm.

[0005] Preferably, the outer sheath tube comprises a first tube, a second tube and a third tube, the second tube is sleeved on the outside of the first tube, the interior of the first tube constitutes the guidewire cavity, the first tube and the second tube constitute the blood drawing channel, the third tube is sleeved on the outside of the second tube, and the third tube and the second tube constitute the inflation channel; The distal end of the first tube and the distal end of the second tube are connected to each other to close the distal end of the blood drawing channel; The distal end of the third tube is connected to the outer wall of the second tube to close the distal end of the inflation channel, and the airbag is connected to the third tube.

[0006] Preferably, the third tube includes a first section and a second section, the first section is spaced apart from the second section, the second section is located on the distal side of the first section, the airbag is sleeved on the outside of the second tube, the proximal end of the airbag is connected to the distal end of the first end, and the distal end of the airbag is connected to the proximal end of the second section.

[0007] Preferably, the second tube is provided with an annular connecting portion, with the connecting portion as the boundary, the part of the second tube on the distal side of the connecting portion is the third section, and the part of the second tube on the proximal side of the connecting portion is the fourth section, the distal end of the third tube is retracted inward and connected to the connecting portion, and the blood drawing port is located in the third section.

[0008] Preferably, the length of the third section is 3-8 mm, the number of the blood drawing ports is two, the blood drawing ports are rectangular, and in the radial direction of the third section, the two blood drawing ports are arranged opposite to each other.

[0009] Preferably, the circumferential arc of the blood drawing port is 60°-120°.

[0010] Preferably, the distal end of the first tube is connected to the distal end of the second tube by an annular connecting belt to close the distal end of the blood drawing channel, and the connecting belt is provided with a plurality of blood drawing ports, which are arranged at equal angles in the circumferential direction of the connecting belt.

[0011] Preferably, the airbag comprises a first connecting portion, a second connecting portion and a crimping portion, the first connecting portion and the second connecting portion are both annular sheets, the crimping portion is annular, and the cross-section of the crimping portion is C-shaped; An annular air supply gap is formed on the outer sheath tube, the front end of the air supply gap is an annular first connecting end, the rear end of the air supply gap is an annular second connecting end, the radial inner side of the first connecting portion is connected to the first connecting end, the radial inner side of the second connecting portion is connected to the second connecting end, the two side edges of the crimping portion are respectively a first side edge and a second side edge, the radial outer side of the first connecting portion is connected to the first side edge, and the radial outer side of the second connecting portion is connected to the second side edge; In the radial direction of the outer sheath tube, from inside to outside, the first connecting portion and the second connecting portion are close to each other.

[0012] Preferably, when the airbag is filled with gas, a ring-shaped pressing surface is formed in the middle of the pressing portion for pressing against the inner wall of the vein.

[0013] Preferably, the cross-section of the crimping portion includes a first C-shaped segment, a straight segment and a second C-shaped segment connected in sequence, the first C-shaped segment and the second C-shaped segment are arranged opposite to each other, the straight segment constitutes the crimping surface, and the length of the straight segment is consistent with the axial length of the air supply gap. Beneficial effects of the present invention: When the guidewire is inserted into the vein, the airbag is in a contracted state, and the entire guidewire delivery assembly is delivered along the vein. When the distal end of the guidewire delivery assembly is about to pass through the venous valve, the delivery of the guidewire delivery assembly is stopped, and the airbag is inflated through the inflation channel to expand the airbag, and the periphery of the airbag is attached to the inner wall of the vein, so that a closed chamber is formed between the airbag and the venous valve. At this time, the blood drawing port is connected to the closed chamber, and blood is drawn through the blood drawing channel. The blood drawing port will draw blood in the closed chamber, so that the pressure in the closed chamber is reduced, so that a pressure difference is formed on both sides of the venous valve. The venous valve opens under the action of the pressure difference, and the guidewire is delivered to the distal side. The guidewire can pass through the opened venous valve, thereby achieving the guidewire passing through the venous valve without damage; after the guidewire passes through the venous valve, blood drawing is stopped, and the gas in the airbag is drawn away, so that the airbag returns to the contracted state, the outer sheath is withdrawn, and the guidewire is left. The structure required for the interventional surgery can be operated on by guiding the guidewire, thereby improving the surgical effect of the interventional surgery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which: Figure 1 is a schematic diagram of the structure of a guidewire delivery assembly; Figure 2 yes Figure 1 Sectional view in the AA direction; Figure 3 It is a schematic diagram when the distal end of the guidewire delivery assembly is delivered to the venous valve; Figure 4 is a schematic diagram of the air bag inflating to form a closed chamber; Figure 5 This is a diagram of drawing blood to open the venous valves; Figure 6 This is a schematic diagram of the guidewire passing through the venous valve; Figure 7 is a schematic diagram of the airbag returning to the deflated state.

[0015] In the figure: 1. Outer sheath; 2. Guide wire; 11. First tube; 12. Second tube; 13. Third tube; 14. Air bag; 15. Blood drawing channel; 16. Inflation channel; 121, the fourth paragraph; 122, the third paragraph; 123, the blood drawing port; 131, first section; 132, second section; 133, air supply gap; 141, first connecting portion; 142, second connecting portion; 143, crimping portion; 1431. First C-shaped segment; 1432. Second C-shaped segment; 1433. Straight line segment. DETAILED DESCRIPTION

[0016] The present invention is described below based on embodiments, but the present invention is not limited to these embodiments. In the following detailed description of the present invention, some specific details are described in detail. In order to avoid confusing the essence of the present invention, known methods, processes, procedures, and components are not described in detail.

[0017] In addition, persons of ordinary skill in the art will appreciate that the drawings provided herein are for illustration purposes and are not necessarily drawn to scale.

[0018] Unless the context clearly requires otherwise, throughout the specification and claims, the words "include", "comprising" and similar words should be interpreted in an inclusive sense rather than an exclusive or exhaustive sense; that is, in the sense of "including but not limited to".

[0019] In the description of the present invention, it should be understood that the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0020] In the present invention, in a surgical situation, the end away from the operator is "distal", and the side close to the operator is "proximal".

[0021] See also Figure 1-Figure 7 The present invention provides a guidewire delivery assembly, which is used to deliver a guidewire 2 in a vein and ensure that the guidewire 2 will not pierce the venous valve during the delivery process. The guidewire delivery assembly includes a guidewire 2 and an outer sheath tube 1, wherein the outer sheath tube 1 is provided with a guidewire cavity, a blood drawing channel 15 and an inflation channel 16, wherein the guidewire cavity passes through both ends of the outer sheath tube 1 along the extension direction of the outer sheath tube 1, and the blood drawing channel 15 extends along the extension direction of the outer sheath tube 1, and a blood drawing port 123 is provided at the distal end of the outer sheath tube 1, and the blood drawing channel 15 is communicated with the blood drawing port 123, and an air bag 14 is connected to the outer sheath tube 1, and the inflation channel 16 extends along the extension direction of the outer sheath tube 1, and the inflation channel 16 is communicated with the air bag 14, and the blood drawing port 123 is located at the distal end side of the air bag 14; The distance between the airbag 14 and the distal end of the outer sheath tube 1 is 3-8 mm.

[0022] The outer sheath tube 1 and the guide wire 2 together constitute a guide wire delivery assembly, and the guide wire 2 is inserted into the guide wire cavity of the outer sheath tube 1. When the guide wire 2 is delivered in the vein, the entire guide wire 2 assembly is delivered along the vein; for the guide wire delivery assembly, at this time, the distal end of the guide wire 2 is basically flush with the distal end of the outer sheath tube 1. In the vein, the delivery direction of the guide wire delivery assembly is against the direction of blood flow, that is, it is delivered from downstream to upstream. When the distal end of the guide wire delivery assembly is delivered to the venous valve, the delivery of the guide wire delivery assembly is stopped ( Figure 3 As shown, the airbag 14 is inflated through the inflation channel 16, so that the airbag 14 expands, and the periphery of the airbag 14 fits the inner wall of the vein, so that a closed chamber is formed between the airbag 14 and the venous valve ( Figure 4 As shown in the figure, at this time, the blood drawing port 123 is connected to the closed chamber, and blood is drawn through the blood drawing channel 15. The blood drawing port 123 will draw blood from the closed chamber, so that the pressure in the closed chamber is reduced, so that a pressure difference is formed on both sides of the venous valve (the blood pressure upstream of the venous valve is greater than the blood pressure downstream), and the venous valve opens under the action of the pressure difference (the two valves in the venous valve are separated from each other, Figure 5 ), the guide wire 2 is delivered to the distal side (the outer sheath 1 remains stationary), and the guide wire 2 can pass through the opened venous valve ( Figure 6 ), thereby achieving the guide wire 2 to pass through the venous valve without damage; after the guide wire 2 passes through the venous valve, blood extraction is stopped, and the gas in the balloon 14 is extracted, so that the balloon 14 returns to the contracted state ( Figure 7 ), at this time the closed chamber is connected to the downstream, and the venous valve is freely opened or closed under the control of blood flow.

[0023] In the present invention, the guide wire cavity extends along the extension direction of the outer sheath tube 1 and passes through both ends of the outer sheath tube 1, so that the guide wire 2 can be pulled relative to the outer sheath tube 1. Therefore, after the airbag 14 is inflated, the outer sheath tube 1 is anchored relative to the vein, and the guide wire 2 can be operated on the proximal side to move distally, so that the distal end of the guide wire 2 moves toward the venous valve and passes through the gap between the two valves.

[0024] The inflation channel 16 is provided so that the inflation channel 16 is in communication with the airbag 14 , so that the inflation channel 16 can be inflated and deflated through the proximal end, thereby controlling the expansion and contraction of the airbag 14 .

[0025] The proximal end of the blood drawing channel 15 passes through the proximal end of the outer sheath tube 1 , and thus the proximal end of the blood drawing channel 15 can be connected to a blood drawing pump. Through the operation of the blood drawing pump, blood can be drawn from the blood drawing port 123 to reduce the pressure in the closed chamber.

[0026] The distance between the airbag 14 and the distal end of the sheath is controlled to be 3-8mm, for example, 3mm, 4mm, 5mm, 6mm, 7mm or 8mm, etc. During the operation, the distal end of the guidewire delivery assembly is basically close to the venous valve (for example, the distance between the distal end of the delivery assembly and the venous valve is within 6mm), so the distance between the airbag 14 and the distal end of the sheath is positively correlated with the size of the closed chamber. The distance between the airbag 14 and the distal end of the sheath is controlled within 10mm, so that the volume of the closed chamber is smaller. Therefore, when drawing blood, the pressure in the closed chamber can be instantly reduced, thereby ensuring that the venous valve can be fully opened, ensuring that the guidewire 2 can pass through the venous valve smoothly, and ensuring that the guidewire 2 will not puncture the venous valve during delivery, thereby improving the safety of the operation.

[0027] The outer sheath tube 1 includes a first tube 11, a second tube 12 and a third tube 13, wherein the second tube 12 is sleeved on the outside of the first tube 11, the interior of the first tube 11 constitutes the guidewire cavity, the first tube 11 and the second tube 12 constitute the blood drawing channel 15, the third tube 13 is sleeved on the outside of the second tube 12, and the third tube 13 and the second tube 12 constitute the inflation channel 16; The distal end of the first tube 11 and the distal end of the second tube 12 are connected to each other to close the distal end of the blood drawing channel 15; The distal end of the third tube 13 is connected to the outer wall of the second tube 12 to close the distal end of the inflation channel 16 , and the airbag 14 is connected to the third tube 13 .

[0028] The inner diameter of the first tube 11 matches the guide wire 2, and the outer diameter of the first tube 11 is smaller than the inner diameter of the second tube 12, so that an annular cavity (blood drawing channel 15) is formed between the first tube 11 and the second tube 12, and the distal end of the first tube 11 and the distal end of the second tube 12 are connected to each other, so that the first tube 11 and the second tube 12 form a whole, and the distal end of the blood drawing channel 15 is closed, and a blood drawing port 123 is formed on the closure of the second tube 12, so that the blood drawing port 123 is connected to the blood drawing channel 15.

[0029] The inner diameter of the third tube 13 is greater than the outer diameter of the second tube 12 , so that an annular cavity (inflation channel 16) is formed between the third tube 13 and the second tube 12 . The distal end of the third tube 13 is connected to the outer wall of the second tube 12 , so that the third tube 13 and the second tube 12 form a whole, and the distal end of the inflation channel 16 is closed. The airbag 14 is connected to the third tube 13 , so the airbag 14 can be inflated and deflated through the inflation channel 16 .

[0030] It can be seen that the inflation channel 16 and the blood drawing channel 15 are separated by the second tube 12, so that the two channels are not connected to each other, thereby ensuring that when inflating, the gas will not enter the vein through the blood drawing channel 15, and when drawing blood, the gas in the airbag 14 will not be drawn away, ensuring the safety of the operation.

[0031] Moreover, the first tube 11, the second tube 12 and the third tube 13 together form the outer sheath tube 1, so that the outer sheath tube 1 is an independent whole, so that the guide wire cavity, the blood drawing channel 15 and the inflation channel 16 can be smoothly formed in the outer sheath tube 1. When conveying the guide wire 2, it is only necessary to control the conveying of the outer sheath tube 1, thereby reducing the difficulty of the operation.

[0032] The third tube 13 includes a first section 131 and a second section 132, wherein the first section 131 and the second section 132 are spaced apart, and the second section 132 is located at the distal end of the first section 131. The airbag 14 is sleeved on the outside of the second tube 12, and the proximal end of the airbag 14 is connected to the distal end of the first section 131, and the distal end of the airbag 14 is connected to the proximal end of the second section 132. The airbag 14 is seamlessly connected to the third tube 13, ensuring that the inflation channel 16 can efficiently inflate and deflate the airbag 14.

[0033] The second tube 12 is provided with an annular connecting portion, with the connecting portion as the boundary, the part of the second tube 12 on the distal side of the connecting portion is the third section 122, and the part of the second tube 12 on the proximal side of the connecting portion is the fourth section 121, the distal end of the third tube 13 is retracted inward and connected to the connecting portion, and the blood drawing port 123 is located in the third section 122.

[0034] The third tube 13 surrounds the fourth section 121 from the outside, and the blood drawing port 123 is located in the third section 122, so that the third tube 13 will not cover the third section 122, that is, the inflation channel 16 will not be connected to the blood drawing port 123, ensuring that the blood drawing port 123 can be directly connected to the closed chamber.

[0035] The length of the third section 122 is 3-8 mm, and the number of the blood drawing ports 123 is two, and the blood drawing ports 123 are rectangular, and the two blood drawing ports 123 are arranged opposite to each other in the radial direction of the third section 122. The number of the blood drawing ports 123 is only two, so that the size of each blood drawing port 123 can be made larger, thereby ensuring that the blood drawing port 123 will not be blocked by a thrombus when drawing blood, and ensuring that the blood in the closed chamber can be smoothly drawn away.

[0036] The circumferential arc of the blood drawing port 123 is 60°-120°.

[0037] In another optional embodiment, the distal end of the first tube 11 and the distal end of the second tube 12 are connected by an annular connecting belt to close the distal end of the blood drawing channel 15, and the connecting belt is provided with a plurality of blood drawing ports 123, and the plurality of blood drawing ports 123 are arranged at equal angles in the circumferential direction of the connecting belt. The thickness direction of the blood drawing ports 123 is consistent with the axial direction of the blood drawing channel 15, and when the blood enters the blood drawing channel 15, the flow direction of the blood remains basically unchanged, thereby reducing the resistance to blood flow and improving the efficiency of drawing blood from the closed chamber.

[0038] When the airbag 14 is filled with air, the airbag 14 includes a first connecting portion 141, a second connecting portion 142 and a crimping portion 143. The first connecting portion 141 and the second connecting portion 142 are both annular sheets, the crimping portion 143 is annular, and the cross-section of the crimping portion 143 is C-shaped. An annular air supply gap 133 is formed on the outer sheath tube 1, the front end of the air supply gap 133 is an annular first connection end, the rear end of the air supply gap 133 is an annular second connection end, the radial inner side of the first connection portion 141 is connected to the first connection end, the radial inner side of the second connection portion 142 is connected to the second connection end, the two side edges of the crimping portion 143 are respectively a first side edge and a second side edge, the radial outer side of the first connection portion 141 is connected to the first side edge, and the radial outer side of the second connection portion 142 is connected to the second side edge; In the radial direction of the outer sheath tube 1 , from inside to outside, the first connecting portion 141 and the second connecting portion 142 gradually approach each other.

[0039] The first connection part 141 and the second connection part 142 lift up the crimping part 143, and the connection between the first connection part 141 and the crimping part 143 is easy to bend, and the connection between the second connection part 142 and the crimping part 143 is easy to bend. Therefore, when the airbag 14 shrinks, the crimping part 143 can bend along these two connections, so that the airbag 14 can shrink better.

[0040] When the airbag 14 is filled with gas, the middle of the crimping portion 143 forms an annular crimping surface for pressing against the inner wall of the vein, so that the airbag 14 can better fit the inner wall of the vein to block the vein.

[0041] The cross-section of the crimping portion 143 includes a first C-shaped segment 1431, a straight segment 1433 and a second C-shaped segment 1432 which are connected in sequence. The first C-shaped segment 1431 and the second C-shaped segment 1432 are arranged opposite to each other. The straight segment 1433 constitutes the crimping surface. The length of the straight segment 1433 is consistent with the axial length of the air supply gap 133.

[0042] The setting of the crimping surface can better fit the inner wall of the vein. It should be understood that the above-mentioned embodiments are merely illustrative and not restrictive. Without departing from the basic principles of the present invention, various obvious or equivalent modifications or substitutions that can be made by those skilled in the art to the above-mentioned details will all be included in the scope of the claims of the present invention.

Claims

1. A guide wire delivery assembly, characterized in that: It comprises a guide wire and an outer sheath tube, wherein a guide wire cavity, a blood drawing channel and an inflation channel are arranged in the outer sheath tube, the guide wire cavity passes through both ends of the outer sheath tube along the extension direction of the outer sheath tube, the blood drawing channel extends along the extension direction of the outer sheath tube, a blood drawing port is arranged at the distal end of the outer sheath tube, the blood drawing channel is communicated with the blood drawing port, an air bag is connected to the outer sheath tube, the inflation channel extends along the extension direction of the outer sheath tube, the inflation channel is communicated with the air bag, and the blood drawing port is located at the distal end side of the air bag; The distance between the airbag and the distal end of the outer sheath is 3-8 mm.

2. The guidewire delivery assembly according to claim 1, characterized in that: The outer sheath tube comprises a first tube, a second tube and a third tube, the second tube is sleeved on the outside of the first tube, the interior of the first tube constitutes the guidewire cavity, the first tube and the second tube constitute the blood drawing channel, the third tube is sleeved on the outside of the second tube, and the third tube and the second tube constitute the inflation channel; The distal end of the first tube and the distal end of the second tube are connected to each other to close the distal end of the blood drawing channel; The distal end of the third tube is connected to the outer wall of the second tube to close the distal end of the inflation channel, and the airbag is connected to the third tube.

3. The guide wire delivery assembly according to claim 2, characterized in that: The third tube includes a first section and a second section, the first section is spaced apart from the second section, the second section is located at the distal side of the first section, the airbag is sleeved on the outside of the second tube, the proximal end of the airbag is connected to the distal end of the first section, and the distal end of the airbag is connected to the proximal end of the second section.

4. The guide wire delivery assembly according to claim 2, characterized in that: The second tube is provided with an annular connecting portion, with the connecting portion as the boundary, the part of the second tube on the distal side of the connecting portion is the third section, and the part of the second tube on the proximal side of the connecting portion is the fourth section. The distal end of the third tube is retracted inward and connected to the connecting portion, and the blood drawing port is located in the third section.

5. The guide wire delivery assembly according to claim 4, characterized in that: The length of the third section is 3-8 mm, and the number of the blood drawing ports is two. The blood drawing ports are rectangular, and in the radial direction of the third section, the two blood drawing ports are arranged opposite to each other.

6. The guide wire delivery assembly according to claim 5, characterized in that: The circumferential arc of the blood drawing port is 60°-120°.

7. The guidewire delivery assembly according to claim 2, characterized in that: The distal end of the first tube is connected to the distal end of the second tube by an annular connecting belt to close the distal end of the blood drawing channel. The connecting belt is provided with a plurality of blood drawing ports, which are arranged at equal angles in the circumferential direction of the connecting belt.

8. The guidewire delivery assembly according to any one of claims 1 to 7, characterized in that: The airbag comprises a first connecting portion, a second connecting portion and a crimping portion, the first connecting portion and the second connecting portion are both annular sheets, the crimping portion is annular, and the cross-section of the crimping portion is C-shaped; An annular air supply gap is formed on the outer sheath tube, the distal end of the air supply gap is an annular first connecting end, the proximal end of the air supply gap is an annular second connecting end, the radial inner side of the first connecting portion is connected to the first connecting end, the radial inner side of the second connecting portion is connected to the second connecting end, the two side edges of the crimping portion are respectively a first side edge and a second side edge, the radial outer side of the first connecting portion is connected to the first side edge, and the radial outer side of the second connecting portion is connected to the second side edge; In the radial direction of the outer sheath tube, from inside to outside, the first connection portion and the second connection portion gradually approach each other.

9. The guidewire delivery assembly according to claim 8, characterized in that: When the airbag is filled with gas, the middle part of the crimping portion forms an annular crimping surface for pressing against the inner wall of the vein.

10. The guide wire delivery assembly according to claim 9, characterized in that: The cross-section of the crimping portion includes a first C-shaped segment, a straight segment and a second C-shaped segment connected in sequence, the first C-shaped segment and the second C-shaped segment are arranged opposite to each other, the straight segment constitutes the crimping surface, and the length of the straight segment is consistent with the axial length of the air supply gap.

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