Split type child-mother type percutaneous puncture dilator

Abstract

The invention discloses a split type child-mother type percutaneous puncture dilator which comprises a puncture needle sleeve and a puncture needle. An outer sheath and a sheath core are arranged on the puncture needle sleeve, the outer sheath is designed to be tearable, the sheath core is designed to be hollow, the inner diameter of the hollow part is equal to the outer diameter of the puncture needle body, the lower end of the sheath core is conical and large in taper, and a fixing bayonet is formed in the upper end of the sheath core and can be fixedly connected with the puncture needle entering the sheath core; the puncture needle comprises a needle sheath and a needle core, a lower needle tip is designed into a bevel opening, and the upper end is provided with a connecting part which can be fixedly connected with a fixing bayonet at the upper end of the sheath core of the cannula, so that the bevel opening surface of the needle tip at the lower end of the puncture needle is exposed out of the lower end of the sheath core. Compared with the prior art, the puncture dilator has the advantages that the whole puncture dilator serves as a mother sword, the puncture needle serves as a son sword, during operation, the puncture needle is independently used for positioning a puncture guiding guide wire, then the whole puncture dilation guide wire is conducted, the channel loss rate is reduced, the dilation success rate is increased, and therefore the puncture dilator is more practical.

Description

Technical Field

[0001] The invention relates to the field of percutaneous puncture dilation equipment, in particular to a split mother-and-child type percutaneous puncture dilator. Background Art

[0002] The puncture needle is an instrument used for percutaneous puncture interventional surgery. Puncture needle intervention is a commonly used minimally invasive surgical diagnosis and treatment method. The puncture needle can be used for tissue biopsy, radiofrequency ablation, drainage, proximal radiotherapy, drug injection, etc. Percutaneous puncture dilation operation is also based on the successful guidance of the puncture needle.

[0003] The common puncture needles on the market are mostly slender rigid structures. Traditional puncture needles use rigid steel needles to reach the vicinity of the target tissue. With the assistance of ultrasound and other images, the doctor swings the puncture needle outside the body while puncturing to reach the target tissue. Because the needle is rigid, the needle tip has good cutting properties, and the range of swing after being embedded in the tissue is limited, so the puncture success rate is high and it can play a good guiding role. However, in the subsequent percutaneous dilation process, when the tear-off sheath is used for puncture and dilation, because the inner core of the tear-off sheath is made of plastic, although the front end is conical in design, the resistance is large, and the operator is bound to increase the axial force and radial force acting on the sheath, so the possibility of failure due to channel loss is high. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a split percutaneous puncture dilation device.

[0005] In order to solve the above problems, the technical solution of the present invention is: a split mother-child type percutaneous puncture dilator, including a puncture needle sleeve and a puncture needle;

[0006] The puncture needle cannula is provided with an outer sheath and a sheath core, the outer sheath is designed to be tearable, that is, it has unidirectional tearing property, and can ensure tearing along a straight line, the sheath core is designed to be hollow, the inner diameter of the hollow part is equal to the outer diameter of the puncture needle body, the lower end of the sheath core is conical, the taper is large, and the upper end is provided with a fixed bayonet, which can connect and fix the puncture needle inserted into the sheath core;

[0007] The puncture needle comprises a needle sheath and a needle core, the lower end of which is designed to be oblique, and the upper end is provided with a connecting portion, which can be connected and fixed with the fixed bayonet at the upper end of the sleeve sheath core, so that the oblique surface of the needle tip at the lower end of the puncture needle is exposed from the lower end of the sheath core.

[0008] Furthermore, the lower end of the sheath core of the puncture needle cannula is designed to be conical with a large taper.

[0009] Furthermore, the puncture needle includes a body and a needle tip, and the needle tip is designed to be oblique.

[0010] Furthermore, the length of the metal needle body of the puncture needle is greater than the length of one needle tip of the puncture needle cannula.

[0011] Furthermore, the outer diameter of the metal needle body of the puncture needle is equal to the inner diameter of the hollow part of the sheath core of the puncture needle cannula.

[0012] The advantages of the present invention compared with the prior art are:

[0013] The present invention is provided with a puncture needle cannula and a puncture needle, wherein the puncture needle cannula as a whole is a mother sword, and the puncture needle is a daughter sword. During operation, the puncture needle is first used alone to position the puncture guide wire, and then the puncture needle sheath is inserted into the cannula sheath core for fixation, and then the whole is used for puncture expansion and introduction. Because the lower end of the integrated puncture dilator has a rigid cutting of the oblique mouth of the puncture needle tip, the resistance during expansion becomes smaller, the operator will greatly reduce the axial force and radial force applied during expansion, it is less likely to lose the channel, the expansion success rate is higher, and it is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a three-dimensional split mother-child type percutaneous puncture dilator Figure 1 .

[0015] Figure 2 The present invention is a three-dimensional split mother-child type percutaneous puncture dilator Figure 2 .

[0016] As shown in the figure: 1. Puncture needle cannula; 2. Puncture needle; 3. Lower end of sheath core; 4. Connector; 5. Fixing bayonet; 6. Needle tip. DETAILED DESCRIPTION

[0017] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0018] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0019] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] like Figure 1 to Figure 2As shown, a split mother-and-child type percutaneous puncture dilator includes a puncture needle cannula 1 and a puncture needle 2; the puncture needle cannula 1 includes an outer sheath and a sheath core, the sheath core is a hollow structure, and a fixed bayonet 5 is provided at the upper end of the sheath core, and the fixed bayonet 5 can be connected and fixed to the puncture needle 2 inserted into the sheath core; the puncture needle 2 includes a needle sheath and a needle core, and a connector 4 interconnected with the fixed bayonet 5 is provided at the upper end of the needle sheath.

[0021] The outer sheath of the puncture needle cannula 1 can be torn, that is, it has unidirectional tearing properties, which can ensure tearing along a straight line. The lower end 3 of the sheath core of the puncture needle cannula 1 is conical in design with a large taper. The lower end of the puncture needle 2 is provided with a needle tip 6, and it is designed to be oblique. The length of the metal needle body of the puncture needle 2 is greater than the length of a needle tip of the puncture needle cannula 1, and the outer diameter of the metal needle body of the puncture needle 2 is equal to the inner diameter of the hollow part of the sheath core of the puncture needle cannula 1.

[0022] In specific use, when in use, first, under the guidance of imaging technology such as ultrasound or CT, the puncture needle 2 is used alone to position the puncture guide wire, and then the guide wire is retained to withdraw the needle sheath, and then the cooperation between the puncture needle sleeve 1 and the puncture needle 2 is used. When in use, the needle sheath of the puncture needle 2 is inserted into the sheath core of the puncture needle sleeve 1, and the connector 4 is used to connect the fixed bayonet 5 to prevent the puncture needle 2 from moving in subsequent operations, and to ensure that the oblique surface of the needle tip 6 is exposed from the lower end of the sheath core of the puncture needle sleeve 1, and the overall The puncture needle cannula 1 and the puncture needle 2 are then dilated by percutaneous puncture along the indwelling guide wire. The expansion depth of the overall device can be controlled according to the depth of the puncture needle entering the target area at the beginning. The needle tip 6 can also be ensured to enter the target area under the guidance of imaging techniques such as ultrasound or CT as needed. After completing the required operations, the sheath core of the puncture needle 2 and the puncture needle cannula 1 is pulled out, and the outer sheath of the puncture needle cannula 1 is retained for subsequent treatment operations, including but not limited to percutaneous nephroscopic treatment, percutaneous nephrostomy, percutaneous cystostomy operations, etc.

[0023] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A split mother-child type percutaneous puncture dilator, characterized in that: It comprises a puncture needle sleeve (1) and a puncture needle (2); The puncture needle cannula (1) comprises an outer sheath and a sheath core, wherein the sheath core is a hollow structure, and a fixing bayonet (5) is provided at the upper end of the sheath core, and the fixing bayonet (5) can be connected and fixed to the puncture needle (2) inserted into the sheath core; The puncture needle (2) comprises a needle sheath and a needle core, and the upper end of the needle sheath is provided with a connector (4) interconnected with a fixed bayonet (5).

2. A split mother-child type percutaneous puncture dilator according to claim 1, characterized in that: The outer sheath of the puncture needle cannula (1) can be torn, that is, it has unidirectional tearing properties and can ensure tearing along a straight line.

3. The split mother-child type percutaneous puncture dilator according to claim 1, characterized in that: The lower end (3) of the sheath core of the puncture needle cannula (1) is designed to be conical with a large taper.

4. The split mother-child type percutaneous puncture dilator according to claim 1, characterized in that: The puncture needle (2) comprises a body and a needle tip (6), and the needle tip (6) is designed to be beveled.

5. The split mother-child type percutaneous puncture dilator according to claim 1, characterized in that: The length of the metal needle body of the puncture needle (2) is greater than the length of one needle tip of the puncture needle sleeve (1).

6. The split mother-child type percutaneous puncture dilator according to claim 1, characterized in that: The outer diameter of the metal needle body of the puncture needle (2) is equal to the inner diameter of the hollow part of the sheath core of the puncture needle cannula (1).

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