[0029] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further explained in detail with reference to the attached drawings and practical examples. It should be understood that the specific embodiments described here are only for explaining the present invention, but not for limiting the present invention.
[0030] Please combine 1 to 8 The minimally invasive puncture sampling device for pathological examination comprises a needle core 1 for puncture sampling of minimally invasive parts, a hand-held block 2 arranged on the needle core 1, a protective sleeve component and a release component. In this embodiment, one end of the needle core 1 is a tip, and the side wall of the needle core 1 close to the tip is provided with an oblique groove (not marked), through which the tissue block in the minimally invasive area can be conveniently taken down.
[0031] The protective sleeve assembly includes a needle sleeve 3 sleeved on the outside of the needle core 1 and a cover 4 sleeved on the outside of the hand-held block 2. One end of the cover 4 is open, and the other end of the cover 4 is connected to the needle sleeve 3 and provided with a pinhole (not shown) which is communicated with the needle sleeve 3 and allows the needle core 1 to penetrate into the needle sleeve 3.
[0032] The end wall of the open end of the cover 4 is elastically provided with two opposite hooks 7. The hand-held block 2 has a circular cross-section and its outer peripheral side has a groove 6 corresponding to the hook 7. When the cover 4 is sleeved on the handle block 2, the two hooks 7 are clamped and fixed in the groove 6. The release assembly is used to release the hook 7 from being clamped and fixed in the groove 6, so as to facilitate the removal of the needle cover 3 and the cover 4.
[0033] The hook 7 includes a swing arm (not shown) rotatably connected to the side wall of the open end of the housing 4 and a chuck (not shown) fixed at one end of the swing arm. A spring 1 8 is arranged between the outer wall of the swing arm near the hand-held block 2 and the end wall of the open end of the housing 4. In this embodiment, the swing arm is connected with the open end of the housing 4 by a hinge.
[0034] When the first spring 8 is not deformed, the distance between the two chucks is smaller than the diameter of the hand-held block 2, so that the chucks are clamped in the groove 6, and the cover 4 is more firmly sleeved on the hand-held block 2.
[0035] 6 The groove has an annular structure as a whole. The release assembly includes a pressing ring 5 which is sleeved on the groove wall of the groove 6 and can move axially along the groove 6. The outer peripheral side of the pressing ring 5 is equally divided into two pressing surfaces 51 with opposite inclination directions along the axial direction, and the pressing surfaces 51 are smoothed. The pressing surface 51 is connected with the hook 7 in a sliding press fit. The diameter length of the ring formed at the junction of the two pressing surfaces 51 is equal to the maximum diameter length of the ring surface of the pressing ring 5.
[0036] Two limiting grooves 9 vertically communicated with the groove 6 are axially arranged in the block of the hand-held block 2, two limiting grooves 9 are slidably connected with limiting blocks 10, and both limiting blocks 10 are fixedly connected with the corresponding ring walls inside the pressing ring 5. One side of each limiting block 10 far away from the needle sleeve 3 is elastically connected with the corresponding groove wall of the limiting groove 9.
[0037] A telescopic rod 11 is arranged between the side of the first limiting block 10 far away from the needle sleeve 3 and the corresponding groove wall of the first limiting groove 9, and a second spring 12 is sleeved outside the telescopic rod 11. When the second spring 12 is not deformed, the ring body of the pressing ring 5 contacts with the groove wall of the groove 6 near the needle sleeve 3.
[0038] There are two opposite movable cavities 13 in the handle block 2, which are located on one side of the groove 6 near the needle sleeve 3. Each movable cavity 13 is radially inserted with a second limiting groove 20, in which a second limiting block 21 is slidably connected. A clamping rod 19 is fixedly inserted into the second limiting block 21, and a third spring 23 is sleeved on the outer side of the clamping rod 19 between the side 21 of the second limiting block away from the center of the hand-held block 2 and the corresponding groove wall of the second limiting groove 20. The outer wall of the hand-held block 2 is provided with a first rod hole (not marked) through which the clamping rod 19 passes, and the inner wall of the cover 4 is provided with a rod. By guiding the clamping rod 19 through the rod hole 1 (not shown), the clamping rod 19 and the rod slot 28 are engaged.
[0039] The two movable cavities 13 respectively correspond to the positions of the two first limiting grooves 9, and each movable cavity 13 and the corresponding first limiting groove 9 are in two-phase communication through rod holes. A connecting rod 14 is slidably inserted into each rod hole 2, one end of the connecting rod 14 is fixedly connected with the first limit block 10, and the other end of the connecting rod 14 extends into the movable cavity 13, and a plurality of first gear teeth (not labeled) are sequentially arranged in the extending direction thereof. The end of the lever 19 far from the lever hole 1 is provided with a plurality of gear teeth 2 (not labeled) in sequence in its extending direction. The movable cavity 13 is respectively provided with a first gear 15 matched with the first gear and a fourth gear 18 matched with the second gear. The first gear 15 is coaxially provided with a second gear 16, and the fourth gear 18 is coaxially provided with a third gear 17 meshed with the second gear 16.
[0040] The rod 19 is provided with a bead groove 24, in which a clamping bead 25 is elastically connected, and the groove wall of the rod slot 28 is provided with a bead placing groove 27 which is clamped and matched with the clamping bead 25.
[0041] A spring 4 26 is arranged between the clamping bead 25 and the bead groove 24. When the spring 4 26 is deformed, the bead center of the clamping bead 25 is flush with the notch of the bead groove 24.
[0042] The axial length of the groove 6 is greater than the sum of the axial length of the pressing ring 5 and the thickness of the chuck. When the chuck is just located between the pressing ring 5 and the groove wall of the groove 6 which is far away from the needle core 1, the surface of the chuck contacts with the ring wall of the pressing ring 5 which is far away from the needle core 1 and the corresponding groove wall of the groove 6, then the first gear 15 on the connecting rod 14 is separated from the first gear 15, and they are not engaged.
[0043] The working principle of this embodiment is that, when the device needs to be stored, the needle core 1 is aligned with the pinhole on the cover 4 through the hand-held block 2, so that the needle core 1 can be inserted into the needle sleeve 3, and the cover 4 can be sleeved outside the hand-held block 2. During this period, the clamping head of the clamping hook 7 will first contact the pressing surface 51 of the pressing ring 5 near the needle sleeve 3, and the pressing surface 51 will be pressed by sliding to make the whole pressing ring 5 move in the groove 6 toward the side away from the needle core 1. When the whole pressing ring 5 moves in the groove 6 toward the side far away from the needle core 1, the pressing ring 5 drives the connecting rod 14 to move synchronously through the limiting block 10, so that the first gear 15 attached to the connecting rod 14 drives the first gear 15 to rotate, the first gear 15 drives the third gear 17 and the fourth gear 18 to rotate through the second gear 16, and the clamping rod 19 moves out of the hand-held block 2 by the second gear 18. The clamping rod 19 drives the limiting block 2 21 to squeeze the spring 3 23, and the end of the clamping rod 19 is clamped into the rod slot 28, so that the auxiliary fixing between the cover 4 and the hand-held block 2 is realized, which is safe and reliable.
[0044]Before the device needs to be used, the needle core 1 needs to be pressed into the needle sleeve 3 by the hand-held block 2 for a certain distance. During this period, the clamping head of the hook part 7 will drive the pressing ring 5 to continue to move away from the needle core 1, until the pressing ring 5 is resisted by the radial groove wall on the side of the groove 6 far away from the needle core 1, and the clamping head will move outward along the previous pressing surface 51, so that the opening angle of the swing arm will gradually increase, and the spring 1 8 will stretch. When the chuck crosses the midline of the two pressing surfaces 51, it will follow the inclined direction of the other pressing surface 51, and continue to move under the action of the elastic force of the first spring 8, and enter the groove 6 corresponding to the position of the other pressing surface 51. During this period, the pressing ring 5 will move synchronously through the connecting rod 14, and the first gear 15 and the first gear 15 on the connecting rod 14 will be separated from each other. Then, the elastic force of the third spring 23 releases to push the second limit block 21 to move reversely in the second limit groove 20.
[0045] Then, the hand-held block 2 and the needle core 1 are pulled out from the cover 4 and the needle sleeve 3. During this period, the hook 7 will drive the pressing ring 5 to move in the direction of the needle core 1 in the groove 6. When the ring wall of the pressing ring 5 near the needle core 1 contacts the corresponding groove wall of the pressing groove 6, the chuck will slide away from the groove 6 along the other pressing surface 51, so that the swing arm opens and the first spring 8 stretches. It should be noted that, At this time, the pulling-out force exerted by the user's hand on the hand-held block 2 needs to be increased momentarily, so that after the chuck slides through the junction of the two pressing surfaces 51, it directly slides over the pressing surface 51 near the needle core 1 and directly contacts the outer wall of the hand-held block 2, and then the cover 4 and the needle sleeve 3 are removed from the hand-held block 2 and the needle core 1 for subsequent use.
[0046] It is worth mentioning that, when the clamping rod 19 enters the rod receiving groove 28, in order to enhance the limiting effect of the rod receiving groove 28 on the clamping rod 19, the clamping bead 25 in the bead groove 24 is pushed into the bead receiving groove 27 formed in the rod receiving groove 28 by the spring 4 26, so that the clamping rod 19 can be stably inserted into the rod receiving groove 28, and the elastic force of the spring 4 26 will not affect the clamping bead 25 from the bead receiving groove 27.
[0047] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.
