Negative pressure rotary cutting puncture catheter

Abstract

A negative pressure rotary cutting puncture catheter effectively solves the problems that when bone tumor needle biopsy sampling is conducted at present, multiple times of repeated puncture sampling are needed, pain of a patient is increased, and the working efficiency of medical staff is reduced. Comprising a T-shaped connecting pipe, the left end of the connecting pipe is in interference fit with an outer pipe with a rightward opening, left-right through cutting grooves are formed in the upper side and the lower side of the outer pipe correspondingly, arc-shaped grooves are formed in the upper side and the lower side of the outer pipe correspondingly, the opposite ends of the two arc-shaped grooves communicate with the cutting grooves in the same side correspondingly, and arc-shaped plates capable of shielding the cutting grooves are slidably connected into the arc-shaped grooves; a rotatable and left-right through inner sleeve is sleeved with the outer pipe, arc-shaped cutters are fixed to the front side and the rear side of the left end of the inner sleeve respectively, the ends, close to the corresponding cutting grooves, of the arc-shaped cutters are blade parts, and negative pressure can be generated in the outer pipe; the puncture needle is ingenious in structure, convenient to use, simple to operate, high in practicability and easy to popularize and use, the number of times of repeated puncture is reduced, pain of a patient is reduced, and the working efficiency of medical staff is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical auxiliary equipment, in particular to a negative pressure rotary cutting puncture catheter. Background Art

[0002] Generally, bone tumor puncture biopsy requires enhanced CT or MRI before puncture biopsy to determine the specific location of the lesion and its relationship with surrounding blood vessels and nerves. After determining the approximate puncture method, puncture is usually performed under the guidance of CT or B-ultrasound. Biopsy needles of different thicknesses are generally used to puncture into the lesion and remove about 2-4 tissue strips of varying lengths. Generally, a tissue strip is about 1-2 cm. The advantages are less trauma, less pollution, and easy recovery. The disadvantages are that the amount of biopsy material aspirated each time is small, and multiple punctures and extractions are required to obtain sufficient specimens. The operation is cumbersome, reducing the work efficiency of medical staff and increasing the pain of patients.

[0003] The existing announcement number is CN211243478U, which discloses a negative pressure rotary cutting puncture sleeve for bone tumor puncture biopsy, including an improved bone cement pusher and a syringe, and a negative pressure spring is installed on the propulsion device of the syringe. The bone cement pusher is connected to the syringe. The bone cement pusher is composed of a rotary cutting inner sleeve, an outer sleeve and a handle connected to the syringe socket. The rotary cutting inner sleeve is installed on the handle connected to the syringe socket, and the rotary cutting inner sleeve is sleeved on the outer sleeve, and a fixed rotating handle is installed on the outer sleeve; although sufficient tissue can be obtained, it is necessary to make an incision in the skin first, and there is also a problem of repeatedly drilling the lesion tissue, which is cumbersome to operate, reduces work efficiency, and has poor practicality. At the same time, a serrated cutting edge is used at the end of the inner sleeve to rotate and cut the bone tumor, and there is a problem that the tumor tissue cannot be completely cut off, and it needs to be sucked out by negative pressure, which increases the pain of the patient. Utility Model Content

[0004] In view of the above situation, in order to overcome the defects of the prior art, the purpose of the utility model is to provide a negative pressure rotary cutting puncture catheter, which effectively solves the problem that multiple repeated punctures and sampling are required for bone tumor puncture biopsy, which increases the pain of patients and reduces the work efficiency of medical staff.

[0005] The technical solution is that the utility model comprises a T-shaped connecting tube, the left end of the connecting tube is interference-fitted with an outer tube with an opening facing right, the left end of the outer tube is provided with a beveled surface, the upper and lower sides of the outer tube are respectively provided with cutting grooves in the left and right directions and passing through inside and outside, the upper and lower sides of the outer tube are respectively provided with arc grooves, the two arc grooves are centrally symmetrically arranged, the opposite ends of the two arc grooves are respectively connected to the cutting grooves on the same side, an arc plate that can cover the cutting groove is slidably connected in the arc groove, the inner part of the outer tube is provided with a rotatable inner sleeve that passes through left and right, the front and rear sides of the left end of the inner sleeve are respectively fixed with arc cutters, the two arc cutters are centrally symmetrically arranged, the end of the arc cutter close to the corresponding cutting groove is a blade portion, and negative pressure can be generated in the outer tube.

[0006] Compared with the prior art, the utility model has the following beneficial effects:

[0007] 1. The utility model has an ingenious structure and is easy to use. It is provided with an outer tube, an inner sleeve, a connecting tube, an arc plate, an arc cutter, and an elastic air bag. No pre-incision is required. The left end of the outer tube can be inserted into the bone tumor. The first plate is rotated to open the two cutting grooves. The elastic air bag is squeezed to suck part of the tumor tissue around the outer tube into the cutting groove. The second plate is rotated to make the two arc cutters cut off two sections of tumor tissue. The operation is simple and the pain of the patient is reduced.

[0008] 2. A circular baffle is provided. When the connecting tube is used in conjunction with an existing syringe, the direction of the outer tube can be adjusted according to the inspection needs, and the arc plate and the arc cutter can be restored to their initial positions, and then another biopsy sampling can be performed on another part of the tumor, thereby reducing the number of repeated punctures, reducing the pain of the patient, and improving the work efficiency of the medical staff. The operation is simple, the practicability is strong, and it is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is an axonometric drawing of the utility model.

[0010] Figure 2 It is a full cutaway front view of the utility model.

[0011] Figure 3 It is a full cutaway top view of the utility model.

[0012] Figure 4 It is a cutaway left view of the utility model.

[0013] Figure 5 It is a cutaway left view of the utility model.

[0014] Figure 6 It is an axonometric view of the inner sleeve and the arc-shaped cutter in the utility model.

[0015] Figure 7 It is an axonometric drawing of the annular plate and the arc plate in the utility model.

[0016] Figure 8 This utility model Figure 7 A is an enlarged view of the middle image. DETAILED DESCRIPTION

[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0018] Depend on Figures 1 to 8 The invention provides a T-shaped connecting tube 1, wherein the left end of the connecting tube 1 is interference-fitted with an outer tube 2 with an opening facing right, the left end of the outer tube 2 is provided with a beveled surface, the upper and lower sides of the outer tube 2 are respectively provided with grooves 3 in the left and right directions and passing through inside and outside, the upper and lower sides of the outer tube 2 are respectively provided with arc grooves 4, the two arc grooves 4 are centrally symmetrically arranged, the opposite ends of the two arc grooves 4 are respectively connected with the grooves 3 on the same side, an arc plate 5 for covering the groove 3 is slidably connected in the arc groove 4, the inner part of the outer tube 2 is provided with a rotatable inner sleeve 6 passing through left and right, the front and rear sides of the left end of the inner sleeve 6 are respectively fixed with arc cutters 7, the two arc cutters 7 are centrally symmetrically arranged, the end of the arc cutter 7 close to the corresponding groove 3 is a blade portion, and negative pressure can be generated in the outer tube 2.

[0019] In order to achieve sliding connection between the arc plate 5 and the arc groove 4, an annular groove connected to the right end of the arc groove 4 is opened on the side wall of the outer tube 2, and an annular plate 8 is sleeved in the annular groove. The left end of the annular plate 8 is fixedly connected to the two arc plates 5.

[0020] In order to facilitate the operation of the annular plate 8 to rotate in the annular groove, an arc-shaped first clearance groove 9 is opened on the right side of the outer tube 2. A first shift plate 10 is fixed on the annular plate 8, and the free end of the first shift plate 10 extends out of the first clearance groove 9.

[0021] In order to facilitate the operation of the inner sleeve 6 to rotate in the outer tube 2, the outer tube 2 is provided with a second make way groove 11 which opens outward and is located to the right of the first make way groove 9. A second shift plate 12 is fixed on the inner sleeve 6, and the free end of the second shift plate 12 extends out of the second make way groove 11.

[0022] In order to prevent the inner sleeve 6 from accidentally rotating in the outer tube 2, a plurality of positioning holes 13 distributed along its circumferential direction and opening to the left are provided on the left step surface of the connecting tube 1, and a slide groove opening to the right is provided on the second shift plate 12. A positioning rod 14 is connected to the bottom of the slide groove via a spring. The right end of the positioning rod 14 is hemispherical and can be inserted into the corresponding positioning hole 13.

[0023] In order to generate negative pressure in the outer tube 2, the right side of the inner sleeve 6 is connected to a hard tube 15, the free end of the hard tube 15 passes through the outer tube 2 and is fixed with an elastic airbag 16, an intake one-way valve 17 with an opening toward the elastic airbag 16 is provided in the hard tube 15, and an exhaust one-way valve 18 is provided at the front end of the elastic airbag 16.

[0024] In order to facilitate multiple and multi-point sampling, a circular baffle 19 is hingedly connected to the connecting tube 1 via a pin shaft, and a torsion spring 20 is provided between the pin shaft and the connecting tube 1 .

[0025] When the utility model is in use, a circular baffle 19 is provided to block the interior of the connecting tube 1 under the action of the torsion spring 20, the elastic airbag 16 is provided to be filled with gas, the arc plate 5 blocks the cutting groove 3, the right end of the positioning rod 14 is inserted into the positioning hole 13 just above the connecting tube 1, the spring is in a natural state, and the arc cutter 7 is in an initial state at one side of the cutting groove 3;

[0026] When it is necessary to take a biopsy sample from the bone tumor, the medical staff disinfects the patient's predetermined puncture point, opens the disposable packaging bag, takes out the outer tube 2, and inserts the left end of the outer tube 2 into the bone tumor under the guidance of B-ultrasound or CT. The medical staff still holds the connecting tube 1 with one hand and moves the first shift plate 10 backward with the other hand. The first shift plate 10 rotates backward in the first yielding groove 9, and the annular plate 8 drives the two arc plates 5 to swing backward with the first shift plate 10 (refer to the attached figure of the specification). Figure 5 ), so that the arc plate 5 gradually slides into the arc groove 4, and the groove 3 is gradually exposed. When the first shift plate 10 slides backward to the rear end of the first yielding groove 9, the arc plate 5 no longer blocks the groove 3. At this time, the two grooves 3 are fully opened;

[0027] Then, open the package of the disposable syringe, connect the nipple on the syringe to the connecting tube 1 by interference fit, squeeze the elastic airbag 16, the pressure in the elastic airbag 16 increases, the exhaust check valve 18 opens, and after the gas in the elastic airbag 16 is discharged, release the elastic airbag 16, the negative pressure in it makes the intake check valve open (at this time, the circular baffle 19 cannot open to the left under the action of the torsion spring 20), and the gas in the outer tube 2 and the inner sleeve 6 is sucked into the elastic airbag 16. At this time, the tumor at the incision groove 3 is The tissue is sucked into the cutting groove 3; one hand holds the outer tube 2, and the other hand pushes the second shift plate 12 forward, and the second shift plate 12 drives the positioning rod 14 to rotate forward along the second yielding groove 11, and the inner wall of the positioning hole 13 squeezes the positioning rod 14, so that the positioning rod 14 slides to the left into the sliding groove and squeezes the spring. When the right end of the positioning rod 14 completely escapes from the positioning hole 13, the second shift plate 12 drives the inner sleeve 6 and the arc-shaped cutter 7 to rotate forward, that is, the arc-shaped cutter 7 rotates clockwise (refer to the attached figure of the specification) Figure 5 ), the blades on the two arc-shaped cutters 7 simultaneously cut the tumor tissue sucked into the cutting groove 3 on the corresponding side. When the second dial plate 12 rotates forward until the positioning rod 14 is inserted into the positioning hole 13 on the front side under the action of the spring, the tumor tissue in the cutting groove 3 is completely cut off by the arc-shaped cutter 7 and is located inside the inner sleeve 6. The push rod of the syringe is pulled to the right, and the negative pressure in the syringe causes the circular baffle 19 to swing right around the pin axis, and the torsion spring 20 is compressed, so that the two sections of tumor tissue after rotational cutting are sucked into the syringe, and the torsion spring 20 and the circular baffle 19 are reset.

[0028] If more tumor tissue is desired, the first and second plates 10 and 12 are pushed backwards so that the arc plate 5 blocks the cutting groove 3 and the arc cutter 7 returns to its initial position. The medical staff adjusts the position of the outer tube 2 so that the outer tube 2 is inserted into another direction of the bone tumor and repeats the above operation to obtain tumor tissue from the other two locations. The operation is simple, reduces the number of times the traditional biopsy needle is repeatedly inserted and pulled out, and improves the sampling efficiency.

[0029] The elastic airbag 16 in the present invention is a prior art and will not be described in detail here.

[0030] The utility model adopts disposable packaging bags for packaging.

Claims

1. A negative pressure rotary cutting puncture catheter, comprising a T-shaped connecting tube (1), characterized in that: The left end of the connecting tube (1) is interference-fitted with an outer tube (2) with an opening facing rightwards. The left end of the outer tube (2) is provided with a chamfered surface. The upper and lower sides of the outer tube (2) are respectively provided with left-right and inside-outside through-cut grooves (3). The upper and lower sides of the outer tube (2) are respectively provided with arc grooves (4). The two arc grooves (4) are centrally symmetrically arranged. The opposite ends of the two arc grooves (4) are respectively connected with the cut grooves (3) on the same side. An arc plate (5) capable of covering the cut groove (3) is slidably connected in the arc groove (4). The inner tube (2) is sleeved with an inner sleeve (6) which is rotatable and passes through the left and right sides. The left end of the inner sleeve (6) is respectively fixed with arc cutters (7). The two arc cutters (7) are centrally symmetrically arranged. The ends of the arc cutters (7) close to the corresponding cut grooves (3) are blade portions. Negative pressure can be generated in the outer tube (2).

2. A negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: The side wall of the outer tube (2) is provided with an annular groove connected to the right end of the arc-shaped groove (4), an annular plate (8) is sleeved in the annular groove, and the left end of the annular plate (8) is fixedly connected to the two arc-shaped plates (5).

3. The negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: The outer tube (2) is provided with an arc-shaped first clearance groove (9) on the right side, a first shifting plate (10) is fixed on the annular plate (8), and a free end of the first shifting plate (10) extends out of the first clearance groove (9).

4. The negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: The outer tube (2) is provided with a second clearance groove (11) which opens outward and is located to the right of the first clearance groove (9). The inner sleeve (6) is fixed with a second shift plate (12), and the free end of the second shift plate (12) extends out of the second clearance groove (11).

5. The negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: The left stepped surface of the connecting pipe (1) is provided with a plurality of positioning holes (13) distributed along its circumferential direction and opening to the left, the second shifting plate (12) is provided with a slide groove opening to the right, the bottom of the slide groove is connected to a positioning rod (14) via a spring, the right end of the positioning rod (14) is hemispherical and can be inserted into the corresponding positioning hole (13).

6. The negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: The right side of the inner sleeve (6) is connected to a hard tube (15), the free end of the hard tube (15) passes through the outer tube (2) and is fixed with an elastic airbag (16), an air intake check valve (17) with an opening facing the elastic airbag (16) is provided in the hard tube (15), and an air exhaust check valve (18) is provided at the front end of the elastic airbag (16).

7. The negative pressure rotary cutting puncture catheter according to claim 1, characterized in that: A circular baffle (19) is hingedly connected to the connecting pipe (1) via a pin shaft, and a torsion spring (20) is provided between the pin shaft and the connecting pipe (1).

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