Micro-puncture blood vessel sheath kit

Abstract

The utility model relates to the technical field of vascular intracavity surgical instruments, and discloses a micro puncture vascular sheath suite, which comprises a dilator, a sheath tube, a puncture needle and a core wire, the far end of the dilator is provided with a first conical surface part, the far end of the sheath tube is provided with a second conical surface part, the sheath tube and the second conical surface part are both sleeved outside the dilator, and the puncture needle is arranged in the sheath tube. The taper of the second conical surface part is smaller than that of the first conical surface part, the puncture needle is matched with the core wire, the core wire comprises a reducing wire, a winding spring and a metal head, the reducing wire is composed of a round section a, a conical section a, a round section b, a conical section b, a flat section a and a flat section b which are sequentially distributed from front to back, the winding spring is connected to the conical section a in an attached mode, and the metal head is connected to the metal head in an attached mode. The core wire has the effects of multi-section bending strength and stress tendency, and can prevent a blood vessel from being easily punctured, so that the risks of hematoma at a surgical approach part of the micro-puncture blood vessel sheath kit and blood vessel leakage at a puncture part are reduced.

Description

Technical Field

[0001] This utility model relates to the field of endovascular surgical instruments, and more specifically, to a micro-puncture vascular sheath kit. Background Technology

[0002] With the development of minimally invasive surgery, endovascular techniques for treating vascular diseases are being used by more and more medical professionals and patients. There are more than one million endovascular surgeries every year. These surgeries all require vascular sheaths as surgical access points. Micro-puncture vascular sheaths allow doctors to create surgical access points in tiny blood vessels, further reducing patient trauma, lowering the risk of puncture site complications, and providing more vascular options for more surgical techniques, such as retrograde lesion techniques.

[0003] However, existing micro-puncture vascular sheath kits are prone to puncturing blood vessels due to their poor bending strength and stress resistance. This increases the risk of hematoma at the surgical approach site and vascular leakage at the puncture site, affecting the reliability of use. Based on this, the present invention designs a micro-puncture vascular sheath kit to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a micro-puncture vascular sheath kit to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A micro-puncture vascular sheath kit includes a dilator, a sheath, a puncture needle, and a mandrel. The distal end of the dilator has a first conical section, and the distal end of the sheath has a second conical section. Both the sheath and the second conical section are fitted over the dilator. The taper of the second conical section is smaller than that of the first conical section. The puncture needle is adapted to the mandrel. The mandrel includes a variable diameter wire, a coiled spring, and a metal head. The variable diameter wire is composed of a circular segment a, a conical segment a, a circular segment b, a conical segment b, a flat segment a, and a flat segment b, distributed sequentially from front to back. The coiled spring is attached to the conical segment a, and the metal head is attached to the flat segment b and the coiled spring. The bending strength of the circular segment a, conical segment a, circular segment b, conical segment b, and flat segment b decreases sequentially from that of the flat segment a.

[0007] As a preferred embodiment of this utility model, the inner diameter of the expander is 0.3mm-1mm, and the outer diameter of the expander is 1mm-3mm.

[0008] As a preferred embodiment of this utility model, the inner diameter of the sheath is 0.5mm-3.5mm, and the outer diameter of the sheath is 1mm-5mm.

[0009] As a preferred technical solution of this utility model, both the expander and the sheath are components made of PE, PP or FEP.

[0010] As a preferred embodiment of this utility model, the cross-sectional shape of the metal head is circular or elliptical.

[0011] As a preferred technical solution of this utility model, the metal head is a component made of platinum, iridium, tungsten, nickel-titanium or steel.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model consists of a variable diameter wire composed of circular segment a, conical segment a, circular segment b, conical segment b, flat segment a, and flat segment b arranged sequentially from front to back. The bending strength of circular segment a, conical segment a, circular segment b, conical segment b, and flat segment b decreases sequentially with flat segment a. The core wire is easy to bend at flat segment a, which gives the core wire the effect of multi-segment bending strength and stress tendency. If the core wire is inserted into a blood vessel, when the core wire touches the blood vessel, flat segment a bends to prevent easy puncture of the blood vessel, thereby reducing the risk of hematoma at the surgical approach site and vascular leakage at the puncture site of the micro-puncture vascular sheath kit, which helps to improve the reliability of use.

[0014] 2. This utility model provides a first conical part at the distal end of the expander and a second conical part at the distal end of the sheath. The taper of the second conical part is smaller than that of the first conical part. This helps to reduce the pulling force and tearing damage to the wound when the expander and sheath are inserted into and withdrawn from the body. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a micro-puncture vascular sheath kit according to the present invention;

[0016] Figure 2 This is a schematic diagram of the variable diameter wire in a micro-puncture vascular sheath kit of this utility model;

[0017] Figure 3 This is a schematic diagram of the core wire in a micro-puncture vascular sheath kit according to this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the expander and sheath in a micro-puncture vascular sheath kit according to this utility model after assembly;

[0019] Figure 5 for Figure 4 A magnified structural diagram of part A in the middle.

[0020] In the diagram: 1. Dilator; 101. First conical section; 2. Sheath; 201. Second conical section; 3. Puncture needle; 4. Core wire; 5. Variable diameter wire; 501. Circular segment a; 502. Conical segment a; 503. Circular segment b; 504. Conical segment b; 505. Flat segment a; 506. Flat segment b; 6. Spring; 7. Metal head. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] like Figures 1 to 5 As shown, this utility model provides a micro-puncture vascular sheath kit, including a dilator 1, a sheath 2, a puncture needle 3, and a mandrel 4. The distal end of the dilator 1 is provided with a first conical portion 101, and the distal end of the sheath 2 is provided with a second conical portion 201. Both the sheath 2 and the second conical portion 201 are fitted over the dilator 1. The taper of the second conical portion 201 is smaller than that of the first conical portion 101. The puncture needle 3 and the mandrel 4 are adapted to each other, allowing the puncture needle 3 to be inserted through the mandrel 4 during use. It includes a variable diameter wire 5, a coiled spring 6, and a metal head 7. The variable diameter wire 5 is composed of circular segment a501, conical segment a502, circular segment b503, conical segment b504, flat segment a505, ​​and flat segment b506 distributed from front to back. The coiled spring 6 is attached to the conical segment a502, and the metal head 7 is attached to the flat segment b506 and the coiled spring 6. The bending strength of the circular segment a501, conical segment a502, circular segment b503, conical segment b504, flat segment b506, and flat segment a505 decreases in that order.

[0023] Among them, such as Figure 4 and Figure 5 As shown, the inner diameter of expander 1 is 0.3mm-1mm, and the outer diameter of expander 1 is 1mm-3mm.

[0024] Among them, such as Figure 4 and Figure 5 As shown, the inner diameter of the sheath 2 is 0.5mm-3.5mm, and the outer diameter of the sheath 2 is 1mm-5mm.

[0025] Among them, such as Figure 1 As shown, both the expander 1 and the sheath 2 are components made of PE, PP or FEP.

[0026] Among them, such as Figure 3As shown, the cross-sectional shape of the metal head 7 is circular or elliptical. The metal head 7 is a component made of platinum, iridium, tungsten, nickel-titanium or steel, which achieves the purpose of giving the metal head 7 good guiding and developing performance.

[0027] The working principle of this utility model:

[0028] The variable diameter wire 5 is composed of circular segment a501, conical segment a502, circular segment b503, conical segment b504, flat segment a505, ​​and flat segment b506 arranged sequentially from front to back. The bending strength of the circular segment a501, conical segment a502, circular segment b503, conical segment b504, flat segment b506, and flat segment a505 decreases sequentially. The core wire 4 is easily bent at the flat segment a505, ​​giving it the effect of multi-segment bending strength and stress tendency. If the core wire 4 is inserted into a blood vessel, when the core... When the wire 4 touches the blood vessel, the flat section a505 bends to prevent easy puncture of the blood vessel, thereby reducing the risk of hematoma at the surgical approach site and vascular leakage at the puncture site. By setting a first conical surface 101 at the distal end of the dilator 1 and a second conical surface 201 at the distal end of the sheath 2, the taper of the second conical surface 201 is smaller than that of the first conical surface 101. When the dilator 1 and the sheath 2 are inserted and withdrawn from the body, it is beneficial to reduce the traction force and tearing damage generated at the wound site.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A micro-puncture vascular sheath kit, characterized by: The device comprises a dilator (1), a sheath (2), a puncture needle (3) and a core wire (4); The distal end of the dilator (1) is provided with a first taper section (101), and the distal end of the sheath (2) is provided with a second taper section (201); the sheath (2) and the second taper section (201) are both externally sleeved on the dilator (1); the taper of the second taper section (201) is smaller than that of the first taper section (101); the puncture needle (3) is matched with the core wire (4). The core wire (4) comprises a variable-diameter wire (5), a coiled spring (6) and a metal head (7); the variable-diameter wire (5) is composed of a circular segment a (501), a taper segment a (502), a circular segment b (503), a taper segment b (504), a flat segment a (505) and a flat segment b (506) arranged in sequence from front to back; the coiled spring (6) is attached to the taper segment a (502); the metal head (7) is attached to the flat segment b (506) and the coiled spring (6); the circular segment a (501), the taper segment a (502), the circular segment b (503), the taper segment b (504), the flat segment b (506) and the flat segment a (505) have bending strengths decreasing in sequence.

2. A micropuncture vascular sheath kit according to claim 1, wherein: The inner diameter of the dilator (1) is 0.3-1 mm, and the outer diameter of the dilator (1) is 1-3 mm.

3. The micro-puncture vascular sheath kit of claim 1, wherein: The inner diameter of the sheath (2) is 0.5-3.5 mm, and the outer diameter of the sheath (2) is 1-5 mm.

4. The micropuncture vascular sheath kit of claim 1, wherein: The dilator (1) and the sheath (2) are both components made of PE, PP or FEP.

5. The micropuncture vascular sheath kit of claim 1, wherein: The cross-sectional shape of the metal head (7) is circular or elliptical.

6. The micropuncture vascular sheath kit of claim 1, wherein: The metal head (7) is a component made of platinum, iridium, tungsten, nickel-titanium or steel.

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