Local cutting device used under intervention

Abstract

The invention relates to a medical foreign matter extraction device, in particular to a local cutting device used under intervention, which comprises an outer tube and an inner tube, at least one end of the outer tube is an open end, the other end of the outer tube far away from the open end is provided with at least one cutting hole, and the open end and the cutting hole are communicated with an inner cavity of the outer tube. One end of the inner tube is inserted into the outer tube from the open end of the outer tube, the tail end of the inner tube is ground into an annular blade, the inner tube can reciprocate in the axial direction of the outer tube, and the other end of the inner tube is reserved outside an inner cavity of the outer tube. A pushing ring used for pushing the inner tube is arranged at the end, remaining outside the inner cavity of the outer tube, of the inner tube. By means of the local cutting device used under intervention, complete cutting of foreign matter can be achieved conveniently.

Description

Technical Field

[0001] The present invention relates to a foreign body extractor for medical use, in particular to a local extractor used in interventional conditions. Background Art

[0002] For hemodialysis patients, central venous catheters are being used for increasingly longer periods of time. Prolonged central venous catheterization can lead to the formation of thrombi or foreign matter, such as fibrin sheaths, within the central vein, causing stenosis. Furthermore, long-term use of arteriovenous fistulas for hemodialysis can also lead to intimal hyperplasia, stenosis, and thrombosis. Currently, the primary treatment for these issues is interventional balloon dilatation, which cannot completely resolve the problem by cutting and removing the foreign matter.

[0003] Chinese patent application number CN107106239B discloses a device for cutting tissue, which achieves tissue cutting through the relative movement of an outer tube and an inner tube. This device is used for vitreous body removal, but is not particularly suitable for removing venous foreign bodies. This is because the device's key innovation—the asymmetrical circular, elliptical, or oval design of the first and second openings—is unable to completely and effectively remove foreign bodies from veins.

[0004] Based on this, it is necessary to design a device for cutting venous foreign bodies. Summary of the Invention

[0005] In order to overcome the deficiencies in the prior art, the present invention provides a local resection device for use during intervention.

[0006] To achieve the above-mentioned purpose, the present invention discloses a local resection device for use during intervention, comprising:

[0007] an outer tube, wherein at least one end of the outer tube is an open end, and at least one cutting hole is provided at the other end of the outer tube away from the open end, wherein the open end and the cutting hole are both connected to the inner cavity of the outer tube;

[0008] An inner tube, one end of the inner tube is inserted into the outer tube through the open end of the outer tube, the inner tube can reciprocate along the axial direction of the outer tube, and the other end of the inner tube is retained outside the inner cavity of the outer tube; the end of the inner tube retained outside the inner cavity of the outer tube is provided with a push ring;

[0009] The beneficial effect of this design is that the device uses the cutting hole of the outer tube to relatively fix the foreign body in the vein, and the foreign body can be completely removed by reciprocating movement of the inner tube.

[0010] A handle is fixed relatively to the outer tube.

[0011] The beneficial effect of this design is that four fingers grasp the handle, and the thumb presses the push ring to drive the inner tube to move relative to the outer tube, which is easy to operate.

[0012] Preferably, both ends of the inner tube are open ends, and the end of the inner tube extending into the inner cavity of the outer tube is ground into a ring-shaped blade. The end of the inner tube remaining outside the inner cavity of the outer tube is detachably connected to a plug, and the plug can be replaced with a suction catheter. The suction catheter provides negative pressure to fix the target object to be cut, and can also directly extract the cut foreign matter.

[0013] Preferably, the outer tube is integrally formed.

[0014] Preferably, the outer tube is integrally formed, and a retention hole is provided at one end close to the cutting hole.

[0015] The beneficial effects of this design are: when removing foreign bodies such as those in the middle vein of the arm, no guidewire is required because the outer tube can be completely closed with a plug; when removing foreign bodies such as those in the middle vein of the heart, positioning must be done through a guidewire, and the plug needs to be replaced with a model with a retention hole; enriching its usage scenarios.

[0016] Preferably, it also includes a handle, and the outer tube and the handle are respectively connected to the handle; the outer wall of the outer tube is provided with convex parts at intervals along the circumferential direction, and the inner wall of the handle is provided with concave parts; the outer tube can be rotated relative to the handle so that the convex part extends into any concave part; the handle is also provided with at least one circle of grooves, and the outer tube is provided with at least one circle of protrusions, and the protrusions extend into the grooves.

[0017] Preferably, the outer tube and the inner tube are both made of stainless steel.

[0018] Preferably, there is one cutting hole.

[0019] Preferably, there are two cutting holes.

[0020] Single-cutting hole design and double-cutting hole design each have their advantages and disadvantages. The single-cutting hole design can make the cutting hole as large as possible and is suitable for removing larger foreign bodies; the double-cutting hole design has more flexible cutting positions.

[0021] The local extractor used under the above-mentioned intervention can be used to remove foreign bodies in the uterus, subcutaneous pyogenes, lipomas, fibromas, and breast nodules. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of Example 1;

[0023] Figure 2 It is a perspective view of embodiment 1;

[0024] Figure 3 This is a structural diagram of Example 3;

[0025] Figure 4 This is a cross-sectional view of the cutting hole in Example 3;

[0026] Figure 5 A cross-sectional view of the cutting hole in the first or second embodiment;

[0027] Figure 6 Schematic diagram of the structure of the outer tube.

[0028] In the figure, 100, outer tube; 101, cutting hole; 102, plug; 103, retention hole; 200, inner tube; 201, push ring; 202, plug; 300, handle; 400, grip. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with embodiments; the examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] Example 1

[0031] A central venous foreign body removal device comprises an outer tube 100, an inner tube 200, a handle 300 and a grip cover 400.

[0032] To ensure strength, the outer tube 100 and inner tube 200 are made of stainless steel. The outer tube 100 is integrally formed, with one end open. A cutout 101 is provided at the end of the outer tube 100, away from the open end. Both the open end and the cutout 101 communicate with the inner cavity of the outer tube 100.

[0033] One end of the inner tube 200 is inserted into the outer tube 100 through the open end of the outer tube 100, while the other end of the inner tube 200 remains outside the inner lumen of the outer tube 100. The inner tube 200 can reciprocate along the axial direction of the outer tube 100. Both ends of the inner tube 200 are open. The end of the inner tube 200 that extends into the inner lumen of the outer tube 100 is ground into a circular cutting edge. The section of the inner tube 200 that remains outside the inner lumen of the outer tube 100 is detachably connected to a plug 202. The plug 202 is threadedly connected to the end of the inner tube 200 and can be replaced with a suction catheter for removing excised tissue and cleaning the inner tube 200.

[0034] The grip 400 fits over the outer tube 100. The outer tube 100's outer wall is circumferentially provided with protrusions, while the inner wall of the grip 400 is provided with recesses. The outer tube 100 can be rotated relative to the grip 400, allowing the protrusions to extend into any of the recesses. The handle 300 is also fixedly connected to the grip 400. A push ring 201 is provided on the sidewall of the inner tube 200. The grip 400 also has at least one ring of grooves, while the outer tube 100 has at least one ring of protrusions, which extend into the grooves. The design of the protrusions and recesses allows the grip 400 and outer tube 100 to remain fixed relative to each other after circumferential rotation; the design of the protrusions and recesses allows the grip 400 and outer tube 100 to remain fixed relative to each other in the axial direction.

[0035] The embodiment discloses a central venous foreign body removal device suitable for removing foreign bodies from arm veins without the need for a guide wire.

[0036] Example 2

[0037] The difference from the first embodiment is that, in this embodiment, a retention hole 103 is provided at one end of the outer tube 100 close to the incision 101 for the guide wire to pass through.

[0038] Based on this, the central venous foreign body removal device disclosed in this embodiment can be used to cut foreign bodies in the central vein.

[0039] Example 3

[0040] The difference from the first and second embodiments is that, in this embodiment, two cutting holes 102 are provided, and the two cutting holes 101 are evenly distributed on the outer wall of the outer tube 100 .

[0041] This device can also be used to remove foreign bodies in the uterus, subcutaneous pyogenic tumors, lipomas, fibromas, and breast nodules. During removal, the foreign body image must be seen under X-ray intervention or ultrasound intervention.

[0042] When in use, the device is inserted into the body through puncture, or into the blood vessel cavity through a sheath, and the device is moved under interventional guidance to place the target object in the cutting hole (at this time, the target object can be fixed by negative pressure suction); after the target object is fixed, the inner tube is pushed to the top of the outer tube, and the target object is separated from the original tissue by the cutting edge of the inner tube; the target object is left in the inner tube or outer tube and separated from the original tissue; after the cutting is completed, the outer tube is pulled out of the original tissue together with the inner tube, and the target object is taken out from the inner and outer tubes after removal, or directly sucked out by negative pressure, and can be cut repeatedly.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A local resection device used in interventional surgery, characterized in that: include An outer tube (100), wherein at least one end of the outer tube (100) is an open end, and at least one cutting hole (101) is provided at the other end of the outer tube (100) away from the open end, and both the open end and the cutting hole (101) are connected to the inner cavity of the outer tube (100); An inner tube (200), one end of the inner tube (200) is inserted into the outer tube (100) through the open end of the outer tube (100), the inner tube (200) can reciprocate along the axial direction of the outer tube (100), and the other end of the inner tube (200) is retained outside the inner cavity of the outer tube (100); the end of the inner tube (200) retained outside the inner cavity of the outer tube (100) is provided with a pushing ring (201) for pushing the inner tube (200); A handle (300) is fixed relative to the outer tube (100).

2. The local extractor for interventional use according to claim 1, characterized in that: Both ends of the inner tube (200) are open ends (101), and the end of the inner tube (200) extending into the inner cavity of the outer tube (100) is ground into an annular blade. One end of the inner tube (200) remaining outside the inner cavity of the outer tube (100) is detachably connected to a plug (202), and the plug (202) can be replaced with a suction catheter.

3. The local extractor for interventional use according to claim 1, characterized in that: The outer tube (100) is integrally formed.

4. The local extractor for interventional use according to claim 3, characterized in that: The outer tube (100) is integrally formed, and a retention hole is provided at one end close to the cutting hole (101).

5. The local extractor for interventional use according to claim 1, characterized in that: The invention also comprises a handle (400), wherein the outer tube (100) and the handle (300) are respectively connected to the handle (400); the outer wall of the outer tube (100) is provided with convex portions at intervals along the circumferential direction, and the inner wall of the handle (400) is provided with concave portions; the outer tube (100) can be rotated relative to the handle (400) so that the convex portion extends into any concave portion; the handle (400) is also provided with at least one circle of grooves, and the outer tube (100) is provided with at least one circle of protrusions, and the protrusions extend into the grooves.

6. The local extractor for interventional use according to claim 1, characterized in that: The outer tube (100) and the inner tube (200) are both made of stainless steel.

7. The local extractor for interventional use according to claim 1, characterized in that: The number of the cutting holes (102) is one or two.

8. Use of the local extractor for interventional use as claimed in any one of claims 1 to 7 in the removal of intrauterine foreign bodies, subcutaneous pyometra, lipoma, fibroma, and breast nodules.

9. Use of the interventional local extractor according to claim 8 in the removal of foreign bodies in the uterus, characterized in that: The local extractor used in the intervention needs to be used after the foreign body image is seen under X-ray intervention and / or ultrasound intervention.

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