Cage type anti-blocking sleeve for blocking prevention of knife tube air path in breast rotary cutting biopsy needle

Abstract

The utility model discloses a cage type anti-blocking sleeve for blocking prevention of a knife tube air path in a breast rotary cutting biopsy needle, which belongs to the technical field of medical equipment and comprises a body, a main vent hole is arranged on the rear portion of the body, and branch vent holes are arranged on the side wall of the front portion of the body. The branch vent holes are formed in the front portion of the anti-blocking sleeve, the cage type square vent holes are formed in the front portion of the anti-blocking sleeve, large-size sample chippings can be effectively controlled to enter the inner cutter pipe connecting air pipe, and air channel blocking is avoided; the arrangement of the concave spherical surface on the top surface of the anti-blocking sleeve is beneficial to clustering of sample tissues, so that the integrity of the sample is kept under vacuum negative pressure suction, large and more sample fragments are prevented from being generated when the sample tissues are pulled and separated by vacuum negative pressure, and the risk that the sample fragments block a gas circuit is reduced; and meanwhile, the time for cleaning sample scraps at the anti-blocking sleeve is shortened, the sampling efficiency is improved, and the operation time of a patient is shortened.

Description

Technical Field

[0001] The utility model belongs to the technical field of medical equipment, in particular to a cage-type anti-blocking sleeve for preventing the gas path of a knife tube in a breast rotary biopsy needle from being blocked. Background Art

[0002] In a biopsy needle, the anti-blocking sleeve is a very important component. First, it provides a vacuum negative pressure airflow path for the inner knife tube, which requires a certain flow area. Second, it pushes the sample tissue out of the inner knife tube when the inner knife tube is retracted, and prevents sample debris from entering the inner hole of the inner knife tube connecting the trachea to prevent air path blockage.

[0003] Existing anti-blocking sleeve structure is as follows Figure 1 The arch structure shown has the following disadvantages:

[0004] During the sampling process, the arched anti-blocking sleeve will increase the probability of vacuum negative pressure pulling the sample and causing separation to produce sample debris. Since the flow aperture of the arched anti-blocking sleeve is large, close to the inner diameter of the inner knife tube connecting the trachea, the sample tissue characteristics are viscoelastic, and it is easy to stretch through the small hole of the anti-blocking sleeve under the action of vacuum negative pressure. After being pulled apart and separated, the pulling force disappears and the sample returns to its original state, blocking the inner knife tube connecting the trachea and the connector, resulting in a small sampling amount or no sample being taken, resulting in sampling failure. When the blocked sample is hard, it is difficult to discharge the sample even with the cleaning function. At this time, the only option is to replace the breast rotary cutting biopsy needle, causing the rotary cutting needle to be scrapped. At the same time, replacing the breast rotary cutting biopsy needle will cause secondary puncture, causing unnecessary harm to the patient. Utility Model Content

[0005] In view of the above problems, the utility model provides a cage-type anti-blocking sleeve for preventing blockage of the air path of the inner blade tube of a breast rotary biopsy needle. By arranging divided air holes at the front part of the anti-blocking sleeve and arranging a cage-type circle of square air holes at the front part of the anti-blocking sleeve, large-sized sample debris can be effectively controlled to enter the inner blade tube to connect the trachea to avoid air path blockage; the concave spherical surface on the top surface of the anti-blocking sleeve is conducive to the clumping of sample tissue, which is conducive to maintaining the integrity of the sample under vacuum negative pressure suction, and avoiding the sample tissue from being pulled and separated by the vacuum negative pressure to produce larger and more sample debris, thereby reducing the risk of sample debris blocking the air path, and at the same time, it is also conducive to reducing the time required for cleaning the sample debris at the anti-blocking sleeve, thereby improving sampling efficiency and reducing patient operation time.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A cage-type anti-blocking sleeve for preventing blockage of the air path of a blade tube in a breast rotary biopsy needle comprises a main body, a main air vent is arranged at the rear of the main body, and branch air vents are arranged on the side wall of the front of the main body. The branch air vents are square air vents, and no less than two branch air vents are arranged along a circumferential array on the side wall of the front of the main body. A concave spherical surface is arranged on the end face of the front of the main body; and a circular air vent is arranged at the center of the concave spherical surface.

[0008] As a further improvement of the above technical solution, the radius of the concave spherical surface is SR4~SR10mm; the diameter of the circular vent hole is less than 0.6 times the diameter of the inner hole of the inner knife tube connected to the trachea.

[0009] As a further improvement of the above technical solution, the width of the branch ventilation hole is less than 0.6 times the diameter of the inner hole of the inner knife tube connecting the trachea.

[0010] As a further improvement of the above technical solution, the sum of the cross-sections of the sub-vents located on the upper part of the main body plus the cross-section of the circular vent is greater than 1.5 times the cross-sectional area of ​​the inner hole of the inner knife tube connecting the trachea.

[0011] Compared with the prior art, the utility model has the following beneficial effects: providing a cage-type anti-blocking sleeve for preventing blockage of the air path of the inner blade tube of a breast rotary biopsy needle, by arranging branch vents at the front of the anti-blocking sleeve and arranging a cage-type circle of square vents at the front of the anti-blocking sleeve, large-sized sample debris can be effectively controlled to enter the inner blade tube to connect the trachea to avoid air path blockage; the concave spherical surface on the top surface of the anti-blocking sleeve is conducive to the clumping of sample tissue, avoiding the maintenance of sample integrity under vacuum negative pressure suction, avoiding the sample tissue being pulled and separated by vacuum negative pressure to produce larger and more sample debris, reducing the risk of sample debris blocking the air path, and also helping to reduce the time required for cleaning sample debris at the anti-blocking sleeve, thereby improving sampling efficiency and reducing patient operation time. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the existing anti-blocking sleeve arch structure.

[0013] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0014] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0015] Figure 4 It is a schematic diagram of the cross-sectional structure of an existing biopsy rotary cutting needle.

[0016] Figure 5 This is a schematic diagram of the working status of this practical cage anti-blocking device.

[0017] Figure 6 This is a schematic diagram of the state in which the sample is exposed to the sampling slot after the inner knife tube of the utility model is retracted into place.

[0018] In the figure: 1. inner knife tube air path joint; 2. lateral air path joint; 3. lateral air pipe connection; 4. inner knife tube connecting air pipe; 5. screw rod; 6. sealing plug; 7. inner knife tube forward and backward driving nut; 8. inner knife tube rotary cutting driving gear; 9. anti-blocking sleeve; 11. inner knife tube; 12. outer knife tube; 13. sampling slot; 14. knife tip; 15. lateral air hole; 16. lateral airway; 30. cut tissue sample; 91. body; 92. main air hole; 93. sub-air hole; 94. circular air hole. DETAILED DESCRIPTION

[0019] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is described in detail below in conjunction with the embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the protection scope of the utility model.

[0020] like Figure 4 As shown, the rotary biopsy needle is composed of an outer knife tube 12, an inner knife tube 11, and an anti-blocking sleeve 9. The inner knife tube is connected to the trachea 4, and the inner knife tube airway connector 1. The front end of the outer knife tube 12 is provided with a knife tip 14 for puncturing into the tissue. An opening is cut on the outer periphery of the outer knife tube behind the knife tip 14 as a sampling groove 13. An array of small holes is opened at the bottom of the sampling groove as a lateral air hole 15. The lateral air hole 15 is connected to the lateral airway 16. The lateral airway 16 is connected to the lateral airway connector 2 through the lateral connection trachea 3. The lateral airway connector 2 is connected to the vacuum negative pressure source through a pipeline. The inner knife tube 11 is arranged in the outer knife tube 12, and is coaxially matched with the outer knife tube 12, and can move forward, backward and rotate in the outer knife tube 12. The inner knife tube 11 is sharpened near the front end of the knife groove for cutting tissue. An inner knife tube rotary cutting driving gear 8 is fixedly assembled on the inner knife tube 11, and the inner knife tube 11 is driven to rotate through gear transmission; at the same time, the screw 5 can drive the inner knife tube 11 forward and backward through the inner knife tube advance and retreat driving nut 7; the rear end of the inner knife tube 11 is equipped with an inner knife tube connecting air pipe 4, the inner knife tube connecting air pipe 4 is fixedly installed, and the length direction extends to the inner cavity of the inner knife tube 11 and is coaxial with the inner knife tube, the inner knife tube connecting air pipe 4 is dynamically sealed with the inner knife tube 11 through the sealing plug 6, the front end of the inner knife tube connecting air pipe 4 is covered with an anti-blocking sleeve 9, and the rear end is connected to the inner knife tube air path joint for connecting a vacuum negative pressure source.

[0021] like Figure 2The cage-type anti-blocking sleeve structure of the utility model shown in or 3 includes a concave spherical surface arranged on the top surface of the anti-blocking sleeve, wherein the radius of the concave spherical surface is SR4~SR10mm; when the anti-blocking sleeve pushes the sample tissue out of the inner knife tube, it is necessary to use the top surface of the anti-blocking sleeve to squeeze the sample tissue, however, the concave spherical surface of the top surface of the anti-blocking sleeve is conducive to the sample tissue being clumped, which is conducive to maintaining the integrity of the sample, avoiding the sample tissue being pulled and separated by the vacuum negative pressure to produce larger and more sample debris, reducing the risk of sample debris blocking the air path, and also reducing the time required for cleaning the sample debris at the anti-blocking sleeve, thereby improving the sampling efficiency and reducing the patient's operation time.

[0022] The anti-blocking sleeve of the cage structure is provided with a circular air vent at the center of the top surface, wherein the diameter of the circular air vent is less than 0.6 times the diameter of the inner hole of the inner knife tube connecting the air pipe (determined by the diameter of the inner hole of the connecting air pipe, the diameter of the circular air vent is 0.6-0.8mm), and the outer circle is 4 branch air vents with a width less than 0.6 times the diameter of the inner hole of the inner knife tube connecting the air pipe, the branch air vents are square air vents, and the sum of the cross-sectional areas of all the air vents in the cylindrical cross-section is greater than 1.5 times the cross-sectional area of ​​the inner hole of the inner knife tube connecting the air pipe. This setting method is conducive to smooth air path, and by setting the size of the circular air vent and the square air vent, large-sized sample debris can be effectively controlled from entering the inner knife tube connecting the air pipe to avoid air path blockage.

[0023] like Figure 5 As shown, when the sample is pushed out of the inner knife tube, the inner knife tube is connected to the air pipe and inserted into the anti-blocking sleeve and fixed by gluing. The anti-blocking sleeve and the inner knife tube are in clearance, and can slide back and forth in the inner knife tube. The inner knife tube retreats to the left, and there is vacuum negative pressure in the air pipe connected to the inner knife tube. The sample tissue is attracted through the air holes of the anti-blocking sleeve. The concave spherical surface of the end face of the anti-blocking sleeve blocks the sample tissue. The central and peripheral vents will cause the sample tissue to bulge outward due to vacuum attraction. However, since the maximum size of the control hole is 0.8mm, it is very rare that the tissue sample is separated due to vacuum negative pressure. Even if the separation produces sample debris, the debris is small and can be discharged through the vacuum pipeline under vacuum negative pressure attraction without causing air path blockage. When the concave spherical surface of the end face of the anti-blocking sleeve blocks the tissue sample, the positive pressure on the tissue sample is conducive to sample agglomeration. When the inner knife tube retreats to the left as shown in FIG. Figure 6 In the position shown, the lateral hole of the anti-blocking sleeve is connected to the atmosphere. Even if there is vacuum negative pressure in the trachea connected to the inner knife tube, the sample tissue is no longer attracted by the vacuum negative pressure; it is in a free state and exposed to the sample collection chamber, which is convenient for the operating assistant to clamp the sample away.

[0024] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0025] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention.

[0026] The above is only a preferred embodiment of the present utility model. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present utility model, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the utility model to other occasions without improvement, should be regarded as the protection scope of the present utility model.

Claims

1. A cage-type anti-blocking sleeve for preventing the air path of the inner blade tube of a breast biopsy needle from being blocked, characterized in that: The invention comprises a body (91), a main vent hole (92) is arranged at the rear of the body (91), and a sub-vent hole (93) is arranged on the side wall of the front of the body (91); the sub-vent holes (93) are square vent holes, and no less than two sub-vent holes (93) are arranged along a circumferential array on the side wall of the front of the body (91); a concave spherical surface is arranged on the end surface of the front of the body (91); and a circular vent hole (94) is arranged at the center of the concave spherical surface.

2. The cage-type anti-blocking sleeve for preventing the air path of the inner blade tube of the breast biopsy needle according to claim 1 is characterized in that: The radius of the concave spherical surface is SR4-SR10 mm; the diameter of the circular vent hole (94) is less than 0.6 times the diameter of the inner hole of the inner knife tube connecting the air pipe (4).

3. The cage-type anti-blocking sleeve for preventing the air path of the inner blade tube of the breast biopsy needle according to claim 2 is characterized in that: The width of the branch ventilation hole (93) is less than 0.6 times the diameter of the inner hole of the inner knife tube connecting air pipe (4).

4. The cage-type anti-blocking sleeve for preventing the air passage of the inner blade tube of the breast biopsy needle according to claim 3 is characterized in that: The sum of the cross-sections of the sub-vent holes (93) located at the upper part of the body (91) plus the cross-section of the circular vent hole (94) is greater than 1.5 times the cross-sectional area of ​​the inner hole of the inner knife tube connecting air pipe (4).

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