A biopsy sampling device with adjustable sample size

Abstract

This invention discloses a biopsy sampling device with adjustable sampling size, belonging to the field of medical diagnostic instruments. It includes a sampling needle with a needle tip at the bottom and a non-slip handle at the top. It also includes a drive mechanism inside the non-slip handle and a sampling mechanism inside the sampling needle. After sampling, during needle retraction, the continuous release of elastic potential energy from the inner piston ring causes the second piston to continuously move downwards. This creates a continuous negative pressure suction through the holes in the sidewall of the sealing block, automatically aspirating residual tissue debris and blood from the sampling wound. This achieves automatic suction from deep to shallow during withdrawal, reducing the difficulty and depth of subsequent wound cleaning, lowering the risk of residual fragmented tissue, and thus reducing post-sampling inflammatory reactions, effectively accelerating recovery and healing.

Description

Technical Field

[0001] This invention relates to the field of medical diagnostic devices, and more specifically, to a biopsy sampling device with adjustable sampling size. Background Technology

[0002] Biopsy, short for biopsy, refers to the technique of removing diseased tissue from a patient's body through cutting, forceps, or puncture for pathological examination when needed for diagnosis or treatment. Biopsy is one of the important bases for assisting clinicians in making diagnoses of lesions or providing clues for disease diagnosis. It can not only understand the nature and development trend of lesions and judge the prognosis of diseases, but also verify and observe the efficacy of drugs and provide reference for clinical medication.

[0003] Current techniques generally require rinsing, hemostasis, and disinfection of the sampling wound after biopsy. However, secondary deep cleaning of the wound after biopsy can easily lead to an enlarged wound, exacerbating trauma and affecting the healing speed. Moreover, for some deeper sampling wounds, ordinary rinsing and debridement are insufficient to efficiently clean the deep parts, which can easily lead to inflammatory reactions caused by fragmented tissue remaining in the wound during the sampling process, resulting in local tissue inflammation and even the risk of repeated infections. This reduces the healing speed of the affected area after sampling and increases the suffering of the sampling patient.

[0004] How to invent a biopsy sampling device with adjustable sampling size to improve these problems has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0005] To overcome the above shortcomings, the present invention provides a biopsy sampling device with adjustable sampling size, which aims to improve the problem of difficulty in cleaning the wound after biopsy sampling in the prior art.

[0006] This invention is implemented as follows:

[0007] The present invention provides a biopsy sampling device with adjustable sampling size, including a sampling needle, a needle tip at the bottom of the sampling needle, a non-slip handle at the top of the sampling needle, and a driving mechanism disposed inside the non-slip handle and a sampling mechanism disposed inside the sampling needle.

[0008] The driving mechanism includes a pressing cylinder elastically disposed inside the anti-slip handle. The outer wall of the pressing cylinder has a groove. The inner side of the anti-slip handle has balls that match the groove on the outer wall of the pressing cylinder. A limit rod is sleeved inside the pressing cylinder. A set of driving connecting rods is sleeved inside the sampling needle. A driving shaft is disposed at the top of the driving connecting rods. A driving rotating cylinder is connected to the bottom of the limit rod. A groove is opened on the inner side of the driving rotating cylinder. Balls that match the groove on the outer side of the driving shaft are disposed on the outer side of the driving rotating cylinder. The sampling mechanism includes a sampling port opened on the side wall of the sampling needle. A blocking block is elastically connected to the outer wall of the driving connecting rod. An upper dividing piston and a lower dividing piston are fixedly installed on the outer wall of the driving connecting rod vertically above and below the blocking block. An inner connecting tube is disposed inside the driving connecting rod. A limit tube is sleeved inside the inner connecting tube. The bottom of the limit tube is fixedly connected to the sampling needle. A power mechanism and a cleaning mechanism are disposed inside the sampling needle.

[0009] Preferably, the power mechanism includes a drive chamber, a pressure chamber, and a reservoir chamber sequentially formed from top to bottom inside the sampling needle along a vertical direction. A first piston is provided on the outer wall of the drive linkage, which fits against the inner side of the drive chamber. Springs connected to the drive chamber are provided on both the upper and lower sides of the first piston. A buffer cylinder is provided inside the pressure chamber, which is sleeved with the drive linkage. An outer piston ring is sleeved between the outer wall of the buffer cylinder and the inner wall of the pressure chamber. An inner piston ring with a spring is sleeved inside the buffer cylinder. A sealing sleeve is provided inside the sampling needle, which fits against the drive linkage. A second piston is sleeved outside the sealing sleeve inside the reservoir chamber. A connecting rod is provided between the second piston and the outer piston ring. Physiological saline is provided between the inside of the reservoir chamber and the bottom of the second piston.

[0010] Preferably, the cleaning mechanism includes multiple sets of nozzles on the inclined surface at the bottom of the needle tip. The nozzles are connected to the bottom of the limiting tube through a pipeline. The side wall of the drive linkage has a connecting hole close to the top of the liquid storage chamber. The side wall of the inner connecting tube has a connecting pipe close to the bottom of the liquid storage chamber. The side wall of the drive linkage between the upper and lower dividing pistons has multiple sets of suction holes connected to the connecting holes. The side wall of the sealing block has multiple sets of evenly distributed holes.

[0011] Preferably, the groove opened on the outer wall of the pressing cylinder consists of two vertical grooves and two inclined grooves. The two vertical grooves and two inclined grooves are spaced apart from each other, and the upper and lower ends of the two vertical grooves are respectively connected to the upper and lower ends of the two inclined grooves. The depth of the upper end of the inclined groove is greater than the depth of the lower end of the inclined groove, and the depth of the vertical groove is between the depth of the upper end of the inclined groove and the depth of the lower end of the inclined groove.

[0012] Preferably, the groove opened on the inner side of the drive drum is two sets of symmetrically designed spiral grooves, with the tops of the two sets of spiral grooves connected and the bottoms of the two sets of spiral grooves connected.

[0013] Preferably, the first piston divides the drive chamber into two non-connected chambers. The side wall of the drive chamber is provided with two sets of pipelines with one-way valves that are connected to the inner cavity of the pressure chamber. The side wall of the drive chamber is also provided with two sets of pipelines with one-way valves that are connected to the top of the sampling needle.

[0014] Preferably, the bottom edge of the lower segment piston and the top edge of the upper segment piston are provided with chamfers.

[0015] Preferably, the sampling needle is designed in three sections, with the sidewall of the sampling needle being threaded between the needle tip and the drive cylinder, and the sidewall of the sampling needle being threaded between the upper dividing piston and the liquid storage chamber.

[0016] In summary, the beneficial effects of this invention are:

[0017] 1. After sampling, during the withdrawal of the sampling needle, the continuous release of the elastic potential energy of the inner piston ring causes the second piston to move continuously downward. Through the hole in the side wall of the sealing block, continuous negative pressure suction is achieved to the outside, which can automatically absorb residual tissue debris and blood inside the sampling wound. This achieves automatic adsorption treatment of the sampling wound from deep to shallow during withdrawal, reducing the difficulty and depth of subsequent wound cleaning, reducing the risk of residual fragmented tissue, thereby reducing the inflammatory response after sampling, and effectively accelerating the recovery and healing speed after sampling.

[0018] 2. After sampling, as the second piston continues to move downwards, the saline solution inside the reservoir is discharged through the connecting tube and the inner connecting tube, ultimately exiting through the nozzle. This achieves automatic flushing and cleaning of the sampling wound after it has been cleaned by the sealing block during needle withdrawal. Moreover, the saline solution discharged through the needle tip ensures thorough flushing and cleaning of the sampling wound from deep to shallow, guaranteeing a deep cleaning effect on the wound, promoting wound healing, reducing the risk of infection, and providing a high cleaning depth. This avoids secondary deep cleaning of the sampling wound after sampling, thereby reducing the pain of the sampler and the risk of secondary injury and infection.

[0019] 3. Simple to operate. Normal sampling and double sampling can be achieved by pressing the cylinder a certain number of times. The sampling wound is neat. Not only can the sample volume be adjusted, but the sampling needle remains almost stationary throughout the sampling and double sampling process, which is highly stable and reduces the risk of secondary injury. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is an overall schematic diagram provided by an embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the internal structure of the sampling needle provided in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the internal structure of the anti-slip handle provided in an embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the sliding groove on the outer wall of the pressing cylinder provided in an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the inner wall sliding groove of the drive drum provided in an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of the internal structure of the sampling needle provided in an embodiment of the present invention.

[0027] Figure 7 This is a schematic diagram of the interior of the liquid storage chamber provided in an embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the internal structure of the sampling needle provided in an embodiment of the present invention.

[0029] Figure 9 This is a schematic diagram of the inside of the needle tip provided in an embodiment of the present invention.

[0030] Legend:

[0031] 100. Sampling needle; 101. Needle tip; 102. Anti-slip handle; 200. Pressing cylinder; 201. Drive cylinder; 202. Drive connecting rod; 203. Drive chamber; 204. First piston; 205. Pressure chamber; 206. Buffer cylinder; 207. Liquid storage chamber; 208. Second piston; 209. Upper dividing piston; 210. Lower dividing piston; 211. Sealing block; 212. Limiting tube; 213. Limiting rod; 214. Drive shaft; 215. Outer piston ring; 216. Inner piston ring; 217. Inner connecting tube; 218. Sampling port; 219. Nozzle; 220. Suction hole; 221. Connecting hole; 222. Connecting tube. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Reference Figure 1-9 This invention provides a biopsy sampling device with adjustable sampling size, including a sampling needle 100, a needle tip 101 at the bottom of the sampling needle 100, and an anti-slip handle 102 at the top of the sampling needle 100. It also includes a drive mechanism disposed inside the anti-slip handle 102 and a sampling mechanism disposed inside the sampling needle 100. The drive mechanism includes a pressing cylinder 200 elastically disposed inside the anti-slip handle 102, and a groove is provided on the outer side wall of the pressing cylinder 200. The inner side of the 02 is provided with ball bearings that match the sliding groove on the outer wall of the pressing cylinder 200. A set of pressing heads extending to the outside of the sampling needle 100 are rotatably connected to the top of the pressing cylinder 200. A limit rod 213 is sleeved inside the pressing cylinder 200. A set of drive connecting rods 202 is sleeved inside the sampling needle 100. A drive shaft 214 is provided at the top of the drive connecting rods 202. A drive rotating cylinder 201 is connected to the bottom of the limit rod 213. The inner side of the drive rotating cylinder 201 has an opening. The outer side of the drive shaft 214 is provided with ball bearings that match the inner groove of the drive drum 201. The sampling mechanism includes a sampling port 218 opened on the side wall of the sampling needle 100. A blocking block 211 is elastically connected to the outer side wall of the drive connecting rod 202. The blocking block 211 blocks the sampling port 218. The edge of the blocking block 211 is designed with a chamfer. The edge of the sampling port 218 is provided with a chamfer that matches the edge of the blocking block 211. When the blocking block 211 moves vertically, the upper dividing piston 209 and the lower dividing piston 210 are fixedly installed on the outer wall of the driving link 202 in the vertical direction above and below the blocking block 211. The driving link 202 is provided with an inner connecting pipe 217. The inner side of the inner connecting pipe 217 is sleeved with a limiting pipe 212. The bottom of the limiting pipe 212 is fixedly connected to the sampling needle 100. The sampling needle 100 is provided with a power mechanism and a cleaning mechanism.

[0034] Reference Figure 1-7The power mechanism includes a drive chamber 203, a pressure chamber 205, and a liquid storage chamber 207, which are sequentially formed vertically from top to bottom inside the sampling needle 100. A first piston 204, which fits against the inner side of the drive chamber 203, is provided on the outer wall of the drive connecting rod 202. Springs connected to the drive chamber 203 are provided on both the upper and lower sides of the first piston 204. A buffer cylinder 206, which is sleeved with the drive connecting rod 202, is provided inside the pressure chamber 205. An outer piston ring 215 is sleeved between the outer wall of the buffer cylinder 206 and the inner wall of the pressure chamber 205. An inner piston ring 216 is sleeved within the inner cavity of the buffer cylinder 206. The inner piston ring 216 and the inner cavity of the buffer cylinder 206... A spring is provided in the middle, and a sealing sleeve is provided inside the sampling needle 100 to fit with the drive connecting rod 202. It should be noted that, through the design of the sealing sleeve, when the drive connecting rod 202 moves, the connecting hole 221 and the connecting tube 222 opened on the side wall are sealed and isolated by the sealing sleeve. This achieves automatic sealing when the connecting hole 221 and the connecting tube 222 are not in the initial position, and will not communicate with other cavities. The sealing sleeve inside the liquid storage cavity 207 is sleeved with a second piston 208. A connecting rod is provided between the second piston 208 and the outer piston ring 215. Physiological saline for debridement is provided between the inside of the liquid storage cavity 207 and the bottom of the second piston 208.

[0035] Reference Figure 7-9 The cleaning mechanism includes multiple sets of nozzles 219 on the bottom slope of the needle tip 101. The nozzles 219 are connected to the bottom of the limiting tube 212 through pipes. The side wall of the drive link 202 is provided with a connecting hole 221 close to the top of the liquid storage chamber 207. The side wall of the inner connecting tube 217 is provided with a connecting tube 222 close to the bottom of the liquid storage chamber 207. The side wall of the drive link 202 located between the upper dividing piston 209 and the lower dividing piston 210 is provided with multiple sets of suction holes 220 connected to the connecting holes 221. The side wall of the sealing block 211 is provided with multiple sets of evenly distributed holes.

[0036] It should be noted that the groove on the outer wall of the pressing cylinder 200 consists of two vertical grooves and two inclined grooves. These grooves are spaced apart, and the upper and lower ends of the vertical grooves are connected to the upper and lower ends of the inclined grooves, respectively. The depth of the upper end of the inclined groove is greater than the depth of the lower end, and the depth of the vertical groove is between the depths of the upper and lower ends of the inclined groove. Specifically, when the pressing cylinder 200 is pressed down, the ball bearings slide in conjunction with the inclined grooves, allowing the pressing cylinder 200 to rotate half a turn with each press. The pressing cylinder 200 is pressed to its maximum position. After the pressure is released, the ball bearing is at the highest point of the vertical groove. When the pressure is released, the ball bearing rebounds and resets under the elastic force of the spring connected by the pivot at the bottom of the pressing cylinder 200. When the ball bearing moves down the vertical groove to the lowest point of the vertical groove, it will move slightly towards the deeper inclined groove due to the elastic setting of the ball bearing, thus guiding it. So that when the pressure is pressed again, the ball bearing will cooperate with the inclined groove to drive the pressing cylinder 200 to rotate in the direction of the inclined groove. This way, each time the pressing cylinder 200 is pressed, it can be driven to rotate half a turn in the same direction.

[0037] Furthermore, the inner side of the drive drum 201 has two sets of symmetrically designed spiral grooves. The tops of the two sets of spiral grooves are connected, and the bottoms of the two sets of spiral grooves are connected. Specifically, when the inner groove of the drive drum 201 is unfolded in a planar form, it can be regarded as a set of sine functions. The ball on the outside of the drive shaft 214 is at the origin. When the drive drum 201 rotates once, causing the ball and the groove to move relative to each other for one cycle, in the first half of the rotation, the trajectory of the ball in the inner groove of the drive drum 201 is first descending and then rising to reset. In the second half of the rotation, the trajectory of the ball in the inner groove of the drive drum 201 is first rising and then... When the cylinder descends and resets, in the initial position, the ball bearings on the side wall of the drive shaft 214 are located at the center of the groove inside the drive cylinder 201. Therefore, when the pressing cylinder 200 presses down and drives the drive cylinder 201 to rotate half a turn, the groove of the drive cylinder 201 first pushes the drive shaft 214 and drives the drive linkage 202 to move down through the ball bearings and then resets. When the pressing cylinder 200 is pressed a second time, it can drive the drive cylinder 201 to rotate half a turn again, so that the drive shaft 214 drives the drive linkage 202 to rise and then reset.

[0038] It should be noted that the drive linkage 202 is connected to the sampling needle 100 by a limit movable sleeve. The drive linkage 202 can move in the vertical direction but cannot rotate by setting a limit key and a limit groove.

[0039] It should be noted that the first piston 204 divides the drive chamber 203 into two non-connected chambers. The side wall of the drive chamber 203 is provided with two sets of pipelines with one-way valves that are connected to the inner cavity of the pressure chamber 205. The side wall of the drive chamber 203 is also provided with two sets of pipelines with one-way valves that are connected to the top of the sampling needle 100.

[0040] Specifically, the pipes located near the top and at the top of the drive chamber 203 are equipped with one-way valves with the flow direction facing upwards towards the outer piston ring 215. When the first piston 204 rises, the air between the first piston 204 and the top of the drive chamber 203 can be pumped into the area above the outer piston ring 215 through the one-way valves and pipes. When the first piston 204 moves downwards, the air between the first piston 204 and the bottom of the drive chamber 203 can be pumped into the area above the outer piston ring 215 through the one-way valves and pipes. Therefore, regardless of whether the first piston 204 rises or falls, it can pump air and store energy above the outer piston ring 215. At the same time, when the first piston 204 moves, the cavity with negative pressure due to the increase in internal volume as the first piston 204 moves away from the drive chamber 203 can introduce external gas into the lower-pressure cavity of the drive chamber 203 through the pipes and one-way valves connected to the top of the sampling needle 100, thereby realizing the cyclic operation of the device.

[0041] Furthermore, the bottom edge of the lower dividing piston 210 and the top edge of the upper dividing piston 209 are provided with chamfers. The chamfered blade-like design can cut and collect the aspirated tissue sample during movement. Compared with the traditional aspiration and tearing method, this device can improve the flatness of the wound on the collection surface and speed up the healing and recovery process by cutting.

[0042] Furthermore, the sampling needle 100 is designed in three sections. The sidewall of the sampling needle 100 is threaded between the needle tip 101 and the drive drum 201, and the sidewall of the sampling needle 100 is threaded between the upper dividing piston 209 and the liquid storage chamber 207. This allows the sampling needle 100 to be easily disassembled through the threaded connection after it is removed, so that the tissue samples obtained from the bottom of the lower dividing piston 210 and the top of the upper dividing piston 209 can be taken out.

[0043] The working process of this biopsy sampling device with adjustable sampling size is as follows:

[0044] After pre-sampling preparations such as disinfection, anesthesia, and positioning are completed, the device is inserted into the living tissue at the designated position, angle, and depth using the needle tip 101. Then, the non-slip handle 102 is held, and the pressing cylinder 200 is pressed to perform sampling. When the pressing cylinder 200 is pressed down, the ball bearings slide in conjunction with the inclined groove, and one press can rotate the pressing cylinder 200 half a turn. This, in turn, drives the drive cylinder 201 to rotate half a turn via the limiting rod 213. The drive cylinder 201 is driven by the cooperation of the internal sliding groove and the ball bearings on the outer wall of the drive shaft 214. First, drive shaft 214 is pushed to move drive linkage 202 downward and then reset. During this process, drive linkage 202 moves downward first, causing upper dividing piston 209, sealing block 211, and lower dividing piston 210 to move downward until the edge of upper dividing piston 209 moves below sampling port 218 and then resets. Due to the sleeve connection between limiting tube 212 and inner connecting tube 217, while drive linkage 202 slides, inner connecting tube 217 can maintain communication with limiting tube 212. When sealing block 211 moves downward, it passes through sampling port 218 and sealing block 210. The chamfered edge of the blocking block 211 can push the blocking block 211 towards the drive linkage 202, so that when the blocking block 211 moves away from the sampling port 218 in the vertical direction, it can automatically retract into the sampling needle 100. During reset, the blocking block 211 can automatically pop out to block the sampling port 218, making the outer wall of the sampling needle 100 nearly a smooth cylinder. This reduces friction between the sampling needle 100 and the live sample when the sampling needle 100 is withdrawn, avoiding secondary damage during sampling withdrawal. At the same time, the blocking block... 211 can also block and obstruct the gap between the upper dividing piston 209 and the lower dividing piston 210. When the upper dividing piston 209 moves, the pressure at the top of the upper dividing piston 209 decreases and becomes a negative pressure state. When the upper dividing piston 209 moves past the sampling port 218, the tissue sample outside the sampling port 218 can be sucked into the sampling needle 100 by the negative pressure. When the drive linkage 202 is reset, the upper dividing piston 209 moves upward and can cut and separate the tissue sample that has entered the sampling needle 100 by the chamfered edge, thus achieving sampling in one go.

[0045] When it is necessary to increase the sampling size, the pressing cylinder 200 can be pressed again after the first sampling. When the pressing cylinder 200 continues to drive the drive cylinder 201 to rotate half a turn, the ball bearings on the side wall of the drive shaft 214 cooperate with the internal sliding groove of the drive cylinder 201. The second half-turn of the drive cylinder 201 will cause the drive shaft 214 to drive the drive connecting rod 202 to rise and then reset. During this process, the drive connecting rod 202 moves upward, causing the upper dividing piston 209, the sealing block 211, and the lower dividing piston 210 to move upward to the bottom of the lower dividing piston 210, rise above the sampling port 218, and then reset. At this time, the negative pressure below the lower dividing piston 210 can draw in the sample and pass it through the lower dividing piston. The piston 210 resets to cut and separate the sample for collection, rather than the traditional pulling and tearing, ensuring a neat wound at the sampling site, which is conducive to healing, reduces tissue fragmentation, and minimizes damage to the sampled tissue. Operation is simple; normal and double sampling can be achieved by pressing the cylinder 200 a certain number of times, allowing for adjustment of the sample volume. Furthermore, during sampling and double sampling, the sampling needle 100 remains almost stationary throughout the entire process. Compared to existing biopsy sampling needles, which require increased operating strokes to increase sample volume, thus easily causing vibration and secondary injury, this device is simple to operate, has a fixed operating stroke, high stability, and reduces the possibility of secondary injury.

[0046] Simultaneously with sampling, when the drive linkage 202 moves vertically, it can drive the first piston 204 to slide inside the drive chamber 203. Through the two sets of one-way valves above the drive chamber 203 and the outer piston ring 215, regardless of whether the first piston 204 rises or falls, it can pump air and store energy above the outer piston ring 215. The increased pressure above the outer piston ring 215 can push the outer piston ring 215 downward. At the same time, the second piston 208 can be driven downward through the bottom linkage of the outer piston ring 215. However, through the dense internal structure of the sampling needle 100... The sealing sleeve design ensures that when the drive rod 202 moves, both the connecting hole 221 and the connecting pipe 222 move into the sealing sleeve. This prevents the saline solution inside the storage chamber 207 from draining into the inner connecting pipe 217 through the connecting pipe 222. At this time, the second piston 208 is difficult to move downwards, thus preventing the outer piston ring 215 from moving downwards. Therefore, the pressure above the outer piston ring 215 can push the inner piston ring 216 downwards. The spring at the bottom of the inner piston ring 216 converts the pressure into elastic potential energy. When the device resets after sampling, the connecting hole 221 and the connecting pipe 222 are connected. When the orifice 221 and connecting tube 222 are reset and disengaged from the sealing sleeve, the spring force at the bottom of the inner piston ring 216 releases, increasing the pressure above the outer piston ring 215 and pushing it downwards. Simultaneously, the connecting rod at the bottom of the outer piston ring 215 pushes the second piston 208 downwards. During the withdrawal of the sampling needle 100 after sampling, the release of the spring force of the inner piston ring 216 pushes the second piston 208 downwards, continuously pressing the saline solution inside the reservoir 207 into the inner connecting tube 217 through the connecting tube 222. The saline solution is discharged through the nozzle 219 via the limiting tube 212 and the internal tubing of the needle tip 101, automatically rinsing the sampling site. Since the saline solution is discharged from the end of the needle tip 101, it ensures deep contact with the sampling wound, thereby improving the cleaning effect of the sampling wound, promoting wound healing and reducing infection. Moreover, the automatic cleaning is performed when the needle is withdrawn at the end of the sampling process, resulting in a high cleaning depth. This avoids secondary deep cleaning of the sampling wound after sampling, thereby reducing the pain of the sampler and reducing the risk of secondary injury and infection.

[0047] Simultaneously, during the downward movement of the second piston 208, the gap between the second piston 208 and the top of the liquid storage chamber 207 increases, creating a negative pressure state. Through the connection between the connecting hole 221 and the suction hole 220, air inside the upper segment piston 209 and the lower segment piston 210 can be drawn in, reducing the pressure between the lower segment piston 210 and the upper segment piston 209. Continuous negative pressure suction can be achieved to the outside through the holes on the surface of the sealing block 211. When the sampling needle 100 withdraws, it can automatically absorb residual tissue debris and blood inside the sampling wound, thus achieving automatic adsorption treatment of the sampling wound from deep to shallow during withdrawal. This achieves an automatic adsorption and cleaning effect on the wound, reducing the risk of residual broken tissue and thus reducing post-sampling inflammatory reactions, effectively accelerating the recovery and healing speed after sampling.

[0048] It should be noted that, due to the limited diameter of the connecting hole 221 and the connecting pipe 222, the flow rate requires a certain amount of time for the elastic release of the inner piston ring 216 to push the outer piston ring 215 and drive the second piston 208 to descend. This ensures that during the withdrawal of the sampling needle 100, the liquid storage chamber 207 can continuously generate suction through the sealing block 211 to adsorb the fragments of broken tissue and blood generated when the sampling needle 100 enters. At the same time, physiological saline can be continuously discharged from the bottom of the needle tip 101 to automatically clean the area after adsorption, effectively ensuring the cleaning effect of the sampling site.

[0049] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A biopsy sampling device with adjustable sampling size, comprising a sampling needle (100), wherein the bottom of the sampling needle (100) is provided with a needle tip (101), and the top of the sampling needle (100) is provided with a non-slip handle (102), characterized in that, It also includes a drive mechanism disposed inside the anti-slip handle (102) and a sampling mechanism disposed inside the sampling needle (100); The driving mechanism includes a pressing cylinder (200) elastically disposed inside the anti-slip handle (102). The outer wall of the pressing cylinder (200) is provided with a groove. The groove on the outer wall of the pressing cylinder (200) consists of two vertical grooves and two inclined grooves. The two vertical grooves and two inclined grooves are spaced apart from each other, and the upper and lower ends of the two vertical grooves are respectively connected to the upper and lower ends of the two inclined grooves. The depth of the upper end of the inclined groove is greater than the depth of the lower end of the inclined groove, and the depth of the vertical groove is between the depth of the upper end of the inclined groove. Between the depth of the angle and the lower end of the inclined groove, the inner side of the anti-slip handle (102) is provided with a ball bearing that matches the outer wall groove of the pressing cylinder (200). The pressing cylinder (200) is internally fitted with a limit rod (213). The sampling needle (100) is internally fitted with a set of drive connecting rods (202). The top of the drive connecting rod (202) is provided with a drive shaft (214). The bottom of the limit rod (213) is connected to a drive rotating cylinder (201). The inner side of the rotating drum (201) is provided with a sliding groove. The inner sliding groove of the driving drum (201) is two sets of symmetrically designed spiral grooves. The tops of the two sets of spiral grooves are connected, and the bottoms of the two sets of spiral grooves are connected. The outer side of the driving shaft (214) is provided with balls that match the inner sliding groove of the driving drum (201). The sampling mechanism includes a sampling port (218) opened on the side wall of the sampling needle (100). The outer side wall of the driving connecting rod (202) is elastically connected with... The sealing block (211) has an upper dividing piston (209) and a lower dividing piston (210) fixedly installed on the outer wall of the drive connecting rod (202). The drive connecting rod (202) has an inner connecting pipe (217) inside. The inner side of the inner connecting pipe (217) is sleeved with a limiting pipe (212). The bottom of the limiting pipe (212) is fixedly connected to the sampling needle (100). The sampling needle (100) has a power mechanism and a cleaning mechanism inside.

2. The biopsy sampling device with adjustable sampling size according to claim 1, characterized in that, The power mechanism includes a drive chamber (203), a pressure chamber (205), and a liquid storage chamber (207) arranged vertically from top to bottom inside the sampling needle (100). A first piston (204) is provided on the outer wall of the drive link (202) and fits against the inner side of the drive chamber (203). Springs connected to the drive chamber (203) are provided at the top and bottom of the first piston (204). A buffer cylinder (206) fitted inside the pressure chamber (205) and sleeved with the drive link (202) is provided on the outer side of the buffer cylinder (206). An outer piston ring (215) is fitted between the side wall and the inner side wall of the pressure chamber (205). An inner piston ring (216) is fitted inside the buffer cylinder (206). A sealing sleeve that fits against the drive connecting rod (202) is provided inside the sampling needle (100). A second piston (208) is fitted outside the sealing sleeve inside the liquid storage chamber (207). A connecting rod is provided between the second piston (208) and the outer piston ring (215). Physiological saline is provided between the inside of the liquid storage chamber (207) and the bottom of the second piston (208).

3. The biopsy sampling device with adjustable sampling size according to claim 2, characterized in that, The cleaning mechanism includes multiple sets of nozzles (219) on the bottom slope of the needle tip (101). The nozzles (219) are connected to the bottom of the limiting tube (212) through pipelines. The side wall of the drive link (202) is provided with a connecting hole (221) close to the top of the liquid storage chamber (207). The side wall of the inner connecting tube (217) is provided with a connecting tube (222) close to the bottom of the liquid storage chamber (207). The side wall of the drive link (202) between the upper dividing piston (209) and the lower dividing piston (210) is provided with multiple sets of suction holes (220) connected to the connecting hole (221). The side wall of the sealing block (211) is provided with multiple sets of evenly distributed holes.

4. The biopsy sampling device with adjustable sampling size according to claim 2, characterized in that, The first piston (204) divides the drive chamber (203) into two non-connected chambers. The side wall of the drive chamber (203) is provided with two sets of pipelines with one-way valves that are connected to the inner cavity of the pressure chamber (205). The side wall of the drive chamber (203) is also provided with two sets of pipelines with one-way valves that are connected to the top of the sampling needle (100).

5. The biopsy sampling device with adjustable sampling size according to claim 1, characterized in that, The bottom edge of the lower segment piston (210) and the top edge of the upper segment piston (209) are provided with chamfers.

6. The biopsy sampling device with adjustable sampling size according to claim 1, characterized in that, The sampling needle (100) is designed in three sections. The side wall of the sampling needle (100) is threaded between the needle tip (101) and the drive drum (201). The side wall of the sampling needle (100) is threaded between the upper dividing piston (209) and the liquid storage chamber (207).

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