Tibia bone marrow puncture needle

Abstract

The invention relates to the technical field of medical instruments, and discloses a tibia bone marrow puncture needle which comprises a puncture needle body and a needle core, the puncture needle body comprises a needle tube body and a handle, and the puncture needle further comprises a buffer assembly; the buffering assembly comprises a buffering spring and a front top plate capable of making contact with a patient, the front top plate is flush with the tip end of the needle tube body, a rear top plate is arranged at the bottom end of the handle, and the two ends of the buffering spring are fixedly connected to the front top plate and the rear top plate respectively. A through hole for the needle tube body to penetrate through is formed in the middle of the front top plate; a plurality of guide sleeves are arranged at the top of the front top plate, and a plurality of guide rods in sliding fit with the guide sleeves are formed at the bottom of the rear top plate; the buffer spring is sleeved on the needle tube body; and the guide sleeve is also provided with a limiting and clamping mechanism for preventing the buffer spring from rebounding and resetting. The invention aims to realize buffering for the puncture needle when the puncture needle is punctured into a marrow cavity, so that medical personnel can receive force in time, the puncture of an opposite-side skeleton is avoided, and the puncture safety is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a tibial bone marrow puncture needle. Background Art

[0002] Tibial puncture is a common diagnostic technique that uses a needle to aspirate bone marrow fluid. Diagnostic tests such as cytology, bacteriology, and parasitology can be performed.

[0003] When performing puncture, medical staff usually manually hold the puncture needle and insert it into the tibial shaft, using a twisting method to drill. They need to judge whether the resistance at the front end of the puncture needle disappears based on the feel, so as to judge whether it has penetrated into the bone marrow cavity. Since the force applied during the drilling process is relatively large, when the resistance at the front end of the needle disappears, there is a feeling of falling into the air. Medical staff may not be able to retract the force in time, resulting in excessive penetration. Especially in the case of elderly patients with brittle bones or young patients with thin bone walls, there is even a threat of puncturing the opposite bone, which results in poor safety.

[0004] In view of this, the inventor conducted in-depth research on the above-mentioned defects in the prior art, and thus came up with this case. Summary of the invention

[0005] The purpose of the present invention is to provide a tibial bone marrow puncture needle, which can buffer the puncture needle when it penetrates into the bone marrow cavity, so that medical staff can withdraw force in time to avoid puncturing the opposite side bone, thereby improving the safety of puncture.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is as follows:

[0007] A tibial bone marrow puncture needle comprises a puncture needle body and a needle core, the puncture needle body comprises a needle tube body and a handle, and also comprises a buffer assembly; the buffer assembly comprises a buffer spring and a front top plate that can contact a patient, the front top plate is flush with the tip of the needle tube body, the bottom end of the handle is provided with a rear top plate, the two ends of the buffer spring are respectively fixedly connected to the front top plate and the rear top plate; a through hole is formed in the middle of the front top plate for the needle tube body to pass through; a plurality of guide sleeves are provided on the top of the front top plate, and a plurality of guide rods slidably matched with the guide sleeves are formed on the bottom of the rear top plate; the buffer spring is sleeved on the needle tube body; the guide sleeve is also provided with a limit locking mechanism to prevent the buffer spring from rebounding and resetting.

[0008] Furthermore, a rotation cavity is formed at the bottom of the rear top plate, a rotation block is rotatably mounted in the rotation cavity, and the guide rod and the buffer spring are fixedly connected to the rotation block. When twisting and piercing are performed, the rotation block can prevent the buffer assembly from rotating together.

[0009] Furthermore, a limiting guide rail extending along the axial direction of the guide sleeve is formed on the inner wall of the guide sleeve; and a limiting slide groove slidably matched with the limiting guide rail is formed on the guide rod. The cooperation between the limiting guide rail and the limiting slide groove prevents the guide rod and the guide sleeve from rotating relative to each other, thereby causing the limiting locking mechanism to disengage from the guide rod.

[0010] Further, a plurality of retaining grooves are formed on one side of the guide rod away from the needle tube body, the retaining grooves have retaining steps and guide surfaces, and the plurality of retaining grooves are arranged at equal intervals along the length direction of the guide rod; the position-limiting retaining mechanism comprises a retaining member that can cooperate with the retaining groove, a driving member that drives the retaining member to exit the retaining groove, a first spring connected between the retaining member and the guide sleeve, and a second spring connected between the driving member and the guide sleeve; a first mounting cavity for mounting the retaining member and the first spring and a second mounting cavity for mounting the driving member and the second spring are formed in the housing of the guide sleeve, and the first mounting cavity is located above the second mounting cavity; the retaining member moves in the radial direction of the guide sleeve, and the driving member moves in the axial direction of the guide sleeve. When twisting and piercing downward, the guide surface can force the retaining member to exit the retaining groove, and after releasing the force, the first spring pushes the retaining member into the retaining groove to contact the retaining step to avoid the rebound of the buffer spring.

[0011] Further, the locking member includes a locking block and a locking plate that can extend into the locking groove and contact the locking step, the locking plate slidably cooperates with the first mounting cavity, and the first spring is fixedly connected to the first mounting cavity and the locking plate; the driving member includes a driving block, a driving plate and a toggle block; the driving plate slidably cooperates with the second mounting cavity, and the second spring is fixedly connected between the bottom of the driving plate and the second mounting cavity; a first guide inclined surface is formed on the top of the driving block, and a second guide inclined surface slidably cooperates with the first guide inclined surface is formed at the bottom of the side of the locking plate close to the locking block; a channel for the driving block to pass through is also formed between the first mounting cavity and the second mounting cavity; the toggle block is connected to the side of the driving plate away from the needle tube body and extends to the outside of the guide sleeve, and a clearance groove for the toggle block to slide up and down is also formed on the outer wall of the guide sleeve.

[0012] Furthermore, the locking and limiting mechanism also includes a driving ring; the driving ring surrounds the outer sides of the plurality of guide sleeves; the toggle block is fixedly connected to the inner side wall of the driving ring. The driving ring can simultaneously control the sliding of the plurality of driving members up and down, making the operation more convenient.

[0013] Furthermore, a threaded column is formed on the upper part of the needle tube body, a connecting column is provided on the top of the threaded column, and the handle is threadedly matched with the threaded column; a connecting cap is formed on the top of the needle core, and the connecting cap is threadedly connected with the connecting column. When in use, the position of the handle can be adjusted according to the actual situation of the patient, so as to expose the needle tube body of the corresponding length, making it easier to control the depth of puncture.

[0014] Furthermore, a fixing assembly is included, the fixing assembly includes a fixing frame sleeved on the front top plate and arc-shaped clamping plates hinged at both ends of the fixing frame, and a torsion spring is provided at the hinge between the arc-shaped clamping plate and the fixing frame. The fixing assembly can be used to keep the puncture needle stable during the puncture process, and after the puncture is completed, when the bone marrow fluid is extracted, the puncture needle can be kept stable.

[0015] After adopting the above structure, the tibial bone marrow puncture needle of the present invention has the following advantages compared with the prior art.

[0016] Beneficial effects:

[0017] 1. In this case, a buffer component is provided. When the front end of the needle tube loses resistance at the moment the puncture needle penetrates the bone marrow cavity, a part of the puncture force can be relieved through the buffer spring, so that the medical staff has enough time to react and withdraw the force in time, avoiding excessive penetration and piercing the opposite bone, thereby improving the safety of the entire puncture operation.

[0018] 2. Initially, make the front top plate flush with the tip of the needle tube body, so that when the puncture begins, the front top plate will contact the patient's skin. In this way, it is easier to maintain the puncture angle of the puncture needle during the entire puncture process, making the puncture more stable.

[0019] 3. By using the limit locking mechanism, after the puncture is in place, during the process of aspirating the bone marrow fluid, the limit locking mechanism can fix the guide rod in the guide sleeve to prevent the puncture needle from bouncing back out of the bone marrow cavity under the action of the elastic force of the buffer spring. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention can be further illustrated by means of non-limiting examples given in the accompanying drawings;

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] Figure 2 It is a structural schematic diagram of another angle of the present invention;

[0023] Figure 3 for Figure 1 Schematic cross-sectional view of ;

[0024] Figure 4 It is a structural schematic diagram of the position limiting locking mechanism in the present invention;

[0025] Figure 5 It is a structural schematic diagram of the locking member in the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the driving member in the present invention;

[0027] Figure 7 It is a schematic structural diagram of the front top plate in the present invention;

[0028] Figure 8 for Figure 7 A schematic diagram of the local enlarged structure at point A in the middle;

[0029] Fig. 9 for Figure 7 Schematic cross-sectional view of ;

[0030] Fig.10 for Fig. 9 A schematic diagram of the local enlarged structure at B in the middle;

[0031] Fig.11 It is a structural schematic diagram of the needle core in the present invention;

[0032] Fig.12 It is a schematic diagram of the structure of the needle tube body in the present invention;

[0033] Fig.13 It is a schematic diagram of the rotating block structure in the present invention.

[0034] The main component symbols are as follows: puncture needle body 1, needle tube body 11, threaded column 111, connecting column 112, handle 12, rear top plate 121, guide rod 1211, limiting slide groove 1212, locking groove 1213, locking step 1214, guide surface 1215, needle core 2, connecting cap 21, buffer assembly 3, buffer spring 31, front top plate 32, through hole 321, guide sleeve 322, limiting guide rail 3221, first installation The mounting cavity 3222, the second mounting cavity 3223, the yield groove 3224, the rotating block 33, the limit locking mechanism 4, the locking member 41, the locking block 411, the locking plate 412, the second guide slope 4121, the driving member 42, the driving block 421, the first guide slope 4211, the driving plate 422, the toggle block 423, the first spring 43, the second spring 44, the driving ring 45, the fixing assembly 5, the fixing frame 51, and the arc-shaped clamping plate 52. DETAILED DESCRIPTION

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions of the specification, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In addition, the directional terms mentioned in the embodiments, such as "upper", "lower", "top", "bottom", "left", "right", "front", "back", etc., are only referenced to the directions of the drawings and are not used to limit the scope of protection of the present invention.

[0036] like Figures 1 to 13 As shown, a tibial bone marrow puncture needle according to the present invention comprises a puncture needle body 1 and a needle core 2. The puncture needle body 1 comprises a needle tube body 11 and a handle 12. The needle core 2 is inserted into the needle tube body 11. During the puncture process, the needle core 2 can prevent the needle tube body 11 from being blocked. When the needle tube body 11 is inserted into the bone marrow cavity and the bone marrow needs to be aspirated, the needle core 2 is pulled out from the needle tube body 11. A buffer component 3 is also provided on the puncture needle. The buffer component 3 comprises a buffer spring 31 and a front top plate 32 that can contact the patient. The front top plate 32 is connected to the needle tube body 1 1, a rear top plate 121 is provided at the bottom end of the handle 12, and two ends of the buffer spring 31 are respectively fixedly connected to the front top plate 32 and the rear top plate 121; a through hole 321 is formed in the middle of the front top plate 32 for the needle tube body 11 to pass through; a plurality of guide sleeves 322 are provided at the top of the front top plate 32, and a plurality of guide rods 1211 slidingly matched with the guide sleeves 322 are formed at the bottom of the rear top plate 121; the buffer spring 31 is sleeved on the needle tube body 11; a limit stop mechanism 4 is also provided on the guide sleeve 322 to prevent the buffer spring 31 from rebounding and resetting. After making preliminary puncture preparations, when performing puncture, align the through hole 321 with the puncture point, and then start twisting puncture. When the needle tube body 11 penetrates into the bone marrow cavity, the front end resistance of the needle tube body 11 disappears. At this time, under the action of the buffer spring 31, it can continue to provide a resistance to the medical staff, so that the medical staff has enough time to react and retract the force in time to avoid excessive penetration and piercing the opposite bone, thereby improving the safety of the entire puncture operation.

[0037] Preferably, a rotation cavity is formed at the bottom of the rear top plate 121, in which a rotation block 33 is rotatably mounted, and the guide rod 1211 and the buffer spring 31 are fixedly connected to the rotation block 33. When twisting and piercing are performed, the rotation block 33 and the rear top plate 121 rotate relative to each other, so that the front top plate 32 and the buffer spring 31 can be kept stable and will not rotate.

[0038] Preferably, a limiting guide rail 3221 extending along the axial direction of the guide sleeve 322 is formed on the inner wall thereof; and a limiting slide groove 1212 slidably matched with the limiting guide rail 3221 is formed on the guide rod 1211. The cooperation between the limiting guide rail 3221 and the limiting slide groove 1212 prevents the guide rod 1211 and the guide sleeve 322 from rotating relative to each other, thereby causing the limiting locking mechanism 4 to disengage from the guide rod 1211.

[0039] Preferably, a plurality of retaining grooves 1213 are formed on one side of the guide rod 1211 away from the needle tube body 11, the retaining grooves 1213 have retaining steps 1214, and guide surfaces 1215, and the plurality of retaining grooves 1213 are arranged at equal intervals along the length direction of the guide rod 1211; the position limiting retaining mechanism 4 includes a retaining member 41 that can cooperate with the retaining groove 1213, a driving member 42 that drives the retaining member 41 to exit the retaining groove 1213, and a first retaining member 42 connected between the retaining member 41 and the guide sleeve 322. The first spring 43 and the second spring 44 connected between the driving member 42 and the guide sleeve 322; the housing of the guide sleeve 322 is formed with a first installation cavity 3222 for installing the locking member 41 and the first spring 43 and a second installation cavity 3223 for installing the driving member 42 and the second spring 44, and the first installation cavity 3222 is located above the second installation cavity 3223; the locking member 41 moves along the radial direction of the guide sleeve 322, and the driving member 42 moves along the axial direction of the guide sleeve 322. When twisting and piercing downward, the guide surface 1215 can force the locking member 41 to retreat from the locking groove 1213, and after releasing the hand to unload the force, the first spring 43 pushes the locking member 41 into the locking groove 1213 and contacts the locking step 1214 to prevent the buffer spring 31 from rebounding. Specifically, the locking member 41 includes a locking block 411 and a locking plate 412 that can be extended into the locking groove 1213 and contact the locking step 1214. The locking plate 412 is slidably matched with the first mounting cavity 3222. The first spring 43 is fixedly connected to the first mounting cavity 3222 and the locking plate 412. There are two locking blocks 411, which are arranged up and down. The spacing between the two locking blocks 411 is equal to the spacing between adjacent locking grooves 1213. The driving member 42 includes a driving block 421, a driving plate 422 and a toggle block 423. The driving plate 422 is slidably matched with the second mounting cavity 3223. The second spring 44 is fixedly connected between the bottom of the driving plate 422 and the second mounting cavity 3223. There are two driving blocks 421, which are distributed left and right. A first guide slope 4211 is formed at the top, and a second guide slope 4121 slidably matched with the first guide slope 4211 is formed at the bottom of the locking plate 412 on one side close to the locking block 411, the locking block 411 is located in the middle of the locking plate 412, and the second guide slopes 4121 are respectively located on both sides of the locking block 411, and the distance between the two driving blocks 421 is equal to the width of the locking block 411; in addition, a channel for the driving block 421 to pass through is also formed between the first mounting cavity 3222 and the second mounting cavity 3223; the toggle block 423 is connected to the side of the driving plate 422 away from the needle tube body 11, and extends to the outside of the guide sleeve 322, and a makeshift groove 3224 for the toggle block 423 to slide up and down is also formed on the outer wall of the guide sleeve 322. The locking and limiting mechanism further includes a driving ring 45 ; the driving ring 45 surrounds the outer sides of the plurality of guide sleeves 322 ; and the toggle block 423 is fixedly connected to the inner side wall of the driving ring 45 .During operation, the driving ring 45 is lifted upward to move the driving member 42 upward. During the movement, the locking member 41 can be moved backward through the cooperation of the first guide slope 4211 and the second guide slope 4121, so that the locking block 411 is disengaged from the locking groove 1213. At this time, the distance between the front top plate 32 and the rear top plate 121 can be adjusted. This operation is mainly performed in the preliminary preparation work.

[0040] Preferably, a threaded column 111 is formed on the upper part of the needle tube body 11, a connecting column 112 is provided on the top of the threaded column 111, and the handle 12 is threadedly matched with the threaded column 111; a connecting cap 21 is formed on the top of the needle core 2, and the connecting cap 21 is threadedly connected with the connecting column 112. When in use, the position of the handle 12 can be adjusted according to the actual situation of the patient, so as to expose the corresponding length of the needle tube body 11, and it is easier to control the depth of puncture. After adjusting the position of the handle 12, the front top plate and the rear top plate 121 can be adjusted through the limit stopper 41, so that the front top plate 32 is aligned with the front end of the needle tube body 11.

[0041] Preferably, a fixing assembly 5 is also provided on the puncture needle, and the fixing assembly 5 includes a fixing frame 51 sleeved on the front top plate 32 and arc-shaped splints 52 hinged at both ends of the fixing frame 51. The fixing frame 51 and the front top plate 32 can be detachably connected by snap-fit ​​or threaded connection, so that the fixing assembly 5 can be easily replaced to adapt to patients of different age groups. A torsion spring is provided at the hinge between the arc-shaped splint 52 and the fixing frame 51. The arc-shaped splint 52 can be made of elastic material. The fixing assembly 5 can be used to keep the needle stable during the puncture process, and after the puncture is completed, when the bone marrow fluid is extracted, the puncture needle can be kept stable. During operation, the two arc-shaped splints 52 only need to be clamped at the part of the patient that needs puncture.

[0042] The method of using the present invention is as follows: after making routine preoperative preparations, adjust the distance between the front top plate 32 and the rear top plate 121 according to the patient's age and body shape, then select an appropriate fixing component 5 and install it on the front top plate 32, then clamp the fixing component 5 at the patient's puncture site so that the through hole 321 on the front top plate 32 corresponds to the puncture point, and then you can start puncturing. The puncture method adopts twisting puncture. During the puncture process, as the needle tube body 11 is inserted, the guide rod 1211 continues to penetrate into the guide sleeve 322, and under the action of the limit locking mechanism 4, the buffer spring 31 can be prevented from rebounding. When the needle tube body 11 penetrates the bone marrow cavity, the buffer spring 31 can continue to provide resistance, so that the medical staff has enough time to react and retract the force in time to avoid excessive penetration and piercing the opposite bone.

[0043] The above is a detailed introduction to a tibial bone marrow puncture needle provided by the present invention. The description of the specific embodiment is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A tibial bone marrow puncture needle, comprising a puncture needle body (1) and a needle core (2), wherein the puncture needle body (1) comprises a needle tube body (11) and a handle (12), characterized in that: The invention also comprises a buffer assembly (3); the buffer assembly (3) comprises a buffer spring (31) and a front top plate (32) which can contact with a patient, the front top plate (32) being flush with the tip of the needle tube body (11), a rear top plate (121) being provided at the bottom end of the handle (12), and two ends of the buffer spring (31) being fixedly connected to the front top plate (32) and the rear top plate (121) respectively; a through hole (321) for the needle tube body (11) to pass through is formed in the middle of the front top plate (32); a plurality of guide sleeves (322) are provided at the top of the front top plate (32), and a plurality of guide rods (1211) which are slidably matched with the guide sleeves (322) are formed at the bottom of the rear top plate (121); the buffer spring (31) is sleeved on the needle tube body (11); and a limit locking mechanism (4) for preventing the buffer spring (31) from rebounding and resetting is also provided on the guide sleeve (322).

2. A tibial bone marrow puncture needle according to claim 1, characterized in that: A rotating cavity is formed at the bottom of the rear top plate (121), a rotating block (33) is rotatably installed in the rotating cavity, and the guide rod (1211) and the buffer spring (31) are fixedly connected to the rotating block (33).

3. A tibial bone marrow puncture needle according to claim 2, characterized in that: A limiting guide rail (3221) extending along the axial direction of the guide sleeve (322) is formed on the inner wall thereof; and a limiting sliding groove (1212) slidably matched with the limiting guide rail (3221) is formed on the guide rod (1211).

4. A tibial bone marrow puncture needle according to claim 1, characterized in that: A plurality of retaining grooves (1213) are formed on a side of the guide rod (1211) away from the needle tube body (11), the retaining groove (1213) having a retaining step (1214) and a guide surface (1215), and the plurality of retaining grooves (1213) are arranged at equal intervals along the length direction of the guide rod (1211); the position limiting retaining mechanism (4) comprises a retaining piece (41) capable of cooperating with the retaining groove (1213), a driving piece (42) for driving the retaining piece (41) to exit the retaining groove (1213), a first spring (43) connected between the retaining piece (41) and the guide sleeve (322), and a second spring (44) connected between the retaining piece (41) and the guide sleeve (322). A second spring (44) is connected between the driving member (42) and the guide sleeve (322); a first mounting cavity (3222) for mounting the retaining member (41) and the first spring (43) and a second mounting cavity (3223) for mounting the driving member (42) and the second spring (44) are formed in the shell of the guide sleeve (322), and the first mounting cavity (3222) is located above the second mounting cavity (3223); the retaining member (42) moves along the radial direction of the guide sleeve (322), and the driving member (42) moves along the axial direction of the guide sleeve (322).

5. A tibial bone marrow puncture needle according to claim 4, characterized in that: The locking member (41) comprises a locking block (411) and a locking plate (412) which can be inserted into the locking groove (1213) and contact the locking step (1214); the locking plate (412) is slidably matched with the first mounting cavity (3222); the first spring (43) is fixedly connected to the first mounting cavity (3222) and the locking plate (412); the driving member (42) comprises a driving block (421), a driving plate (422) and a toggle block (423); the driving plate (422) is slidably matched with the second mounting cavity (3223); the second spring (44) is fixedly connected between the bottom of the driving plate (422) and the second mounting cavity (3223); A first guiding bevel (4211) is formed on the top of the driving block (421), and a second guiding bevel (4121) slidingly matched with the first guiding bevel (4211) is formed on the bottom of the locking plate (412) on the side close to the locking block (411); a channel for the driving block (421) to pass through is also formed between the first mounting cavity (3222) and the second mounting cavity (3223); the toggle block (423) is connected to the side of the driving plate (422) away from the needle tube body (11), and extends to the outside of the guide sleeve (322), and a clearance groove (3224) for the toggle block (423) to slide up and down is also formed on the outer wall of the guide sleeve (322).

6. A tibial bone marrow puncture needle according to claim 5, characterized in that: The locking and limiting mechanism (4) further comprises a driving ring (45); the driving ring (45) surrounds the outer sides of the plurality of guide sleeves (322); and the shifting block (423) is fixedly connected to the inner side wall of the driving ring (45).

7. A tibial bone marrow puncture needle according to claim 1, characterized in that: A threaded column (111) is formed on the upper part of the needle tube body (11), a connecting column (112) is provided on the top of the threaded column (111), and the handle (12) is threadedly matched with the threaded column (111); a connecting cap (21) is formed on the top of the needle core (2), and the connecting cap (21) is threadedly connected to the connecting column (112).

8. The tibial bone marrow puncture needle according to claim 1, characterized in that: It also comprises a fixing assembly (5), the fixing assembly (5) comprising a fixing frame (51) sleeved on the front top plate (32) and an arc-shaped clamping plate (52) hinged at both ends of the fixing frame (51), and a torsion spring is provided at the hinge between the arc-shaped clamping plate (52) and the fixing frame (51).

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