A semi-automatic tissue sampling lance with integrated safety mechanism

Abstract

The utility model discloses a half -automatic organization sampling puncture ware with integrated safety mechanism belongs to medical instrument technical field, the puncture ware includes installation shell, puncture needle, chamber mechanism, firing piece, safety assembly and locking assembly, safety assembly includes stop piece and operating part, and stop piece swing setting is in installation shell rear end, and operating part sets up on firing piece and with stop piece transmission cooperation, safety assembly has safety state and release state, and stop piece blocks the sliding path of firing piece under safety state, and stop piece leaves the sliding path of firing piece under release state, and operating part is driven stop piece and switches between safety state and release state in response to pressing action. The utility model integrates safety assembly on firing piece, and can complete safety release and firing in proper order through pressing operating part, realizes single -hand coherent operation, has simplified the operation step of human body tissue sampling, has improved the fluency and safety of surgical operation.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a semi-automatic tissue sampling puncture device with an integrated insurance mechanism. Background Technology

[0002] Semi-automatic tissue sampling puncture needles are commonly used interventional medical devices in clinical practice for obtaining human tissue samples for pathological diagnosis. They are specialized puncture instruments for removing media from the human body, using spring-loaded energy to drive the coordinated movement of inner and outer needles, achieving rapid tissue cutting and sampling. Existing semi-automatic tissue sampling puncture needles typically include a housing, a puncture needle head, and a loading mechanism housed within the housing. The loading mechanism, after being spring-loaded, is held in a ready-to-fire state by a locking component. The operator presses the firing mechanism to release the spring energy and complete the sampling. For example, Chinese utility model patent CN215994066U discloses a semi-automatic biopsy puncture needle that uses a safety pin to limit and lock the firing lever, and a movable seat and buckle to achieve position locking, providing basic sampling and safety protection functions.

[0003] However, the aforementioned existing technology and the plug-in safety pin structure used in most similar products on the market have significant shortcomings in actual clinical tissue sampling operations. First, inserting and removing the safety pin requires the operator to hold the trocar body with one hand and pinch the safety pin with the other to insert or remove it. This two-handed operation is not only cumbersome but also prone to delays in puncture scenarios requiring rapid response. Second, the independent structure of the safety pin poses a risk of detachment during clinical use. Once the safety pin detaches from the instrument, it not only renders the safety function ineffective but may also fall into the surgical area, causing contamination or aspiration hazards. More importantly, disengaging the safety pin and triggering the firing mechanism are two separate steps. The operator must manually remove the safety pin before pressing the firing mechanism to complete the sampling. This process cannot be performed with one hand. When holding the trocar with one hand, the operator often needs to change their grip or use other parts of their body to disengage the safety pin, severely affecting the smoothness and accuracy of the surgical procedure. Therefore, there is an urgent need to improve the existing technology to solve the problems of inconvenient operation of the safety structure of the semi-automatic tissue sampling puncture needle and difficulty in achieving continuous one-handed operation. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing semi-automatic tissue sampling puncture needle safety structures, which are cumbersome to operate and cannot achieve continuous single-handed operation, and to provide a semi-automatic tissue sampling puncture device with an integrated safety mechanism to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A semi-automatic tissue sampling puncture device with an integrated safety mechanism includes a mounting housing, a puncture needle, and a loading mechanism disposed within the mounting housing. The loading mechanism includes a movable chamber and a first spring. The outer needle tube of the puncture needle is fixedly connected to the front end of the movable chamber. It also includes a firing element, a safety assembly, and a locking assembly. The locking assembly locks the loading mechanism. The firing element is slidably disposed at the rear end of the mounting housing along its axial direction, and its front end cooperates with the locking assembly to release the locking assembly upon pressing, thereby triggering the loading mechanism to fire. The safety assembly includes a limiting element and an operating element. The limiting element is movably disposed at the rear end of the mounting housing, and the operating element is disposed on the firing element and drives the limiting element. The safety assembly has a locked state and a released state. In the locked state, the limiting element blocks the sliding path of the firing element, restricting its movement relative to the mounting housing. In the released state, the limiting element leaves the sliding path of the firing element, allowing the firing element to move relative to the mounting housing. The operating element responds to the operator's pressing action, driving the limiting element to switch between the locked state and the released state.

[0007] Furthermore, an end cap is fixed to the rear end of the housing, and a guide chamber is provided on the end cap. The firing component also includes a guide portion fixedly connected to the firing component. The guide portion is slidably disposed in the guide chamber along the axial direction. An installation groove is provided on the side wall of the guide chamber, and a limiting member is slidably disposed in the installation groove. The limiting member has an abutment surface on the side facing the operating component. In the safe state, the abutment surface of the limiting member extends out of the inner wall of the guide chamber, and the lower end of the guide portion abuts against the abutment surface, blocking the axial sliding of the guide portion.

[0008] Furthermore, the limiting member is provided with a triggering ramp on the side facing the operating member, and the triggering ramp is located in front of the abutment surface; the guide part has a guide cavity, and the operating member is slidably disposed in the guide cavity; the lower end of the operating member is fixedly provided with a trigger rod that cooperates with the triggering ramp; when the operating member is pressed, the trigger rod pushes the limiting member radially outward through the ramp, causing the abutment surface to retract into the mounting groove, releasing the abutment on the lower end of the guide part, and the safety component switches to the released state.

[0009] Furthermore, a second spring is provided between the limiting member and the bottom of the mounting groove. The two ends of the second spring abut against the outer end of the limiting member and the bottom of the mounting groove, respectively, to drive the limiting member to slide inward radially and reset, so that the safety component springs back to the safety state.

[0010] Furthermore, a partition is provided inside the guide cavity, and the firing element also includes a third spring and a fourth spring. The third spring is located inside the guide chamber, with one end abutting against the bottom wall of the guide chamber and the other end abutting against the lower surface of the partition, for providing the firing element with a restoring force after being pressed and fired; the fourth spring is located between the operating element and the upper surface of the partition, for providing the operating element with a restoring force after being pressed.

[0011] Furthermore, the partition has an opening through which the trigger rod extends into the guide chamber and engages with the trigger ramp of the limiting member.

[0012] Furthermore, there are two limiting components, which are symmetrically slidably mounted on two opposite side walls of the guide chamber. The operating component is equipped with two trigger rods, which are respectively matched with the triggering inclined surfaces of the two limiting components.

[0013] Furthermore, the locking assembly includes locking ears symmetrically arranged on the left and right sides of the movable chamber, and elastic locking plates symmetrically fixed on the left and right sides of the mounting housing; the front end of the elastic locking plate is a fixed end and the rear end is a free end, and the free end of the elastic locking plate has at least one locking groove that cooperates with the locking ear. The locking ear has a wedge-shaped structure, and the locking ear can slide into the locking groove when the movable chamber moves backward to achieve locking in the loaded state; the end cover also has a guide hole for the firing rod to pass through, the rear end of the firing rod is fixedly connected to the front end face of the operating component, and the front end of the firing rod extends through the guide hole to the inner cavity of the mounting housing.

[0014] Furthermore, there are two firing levers, with the front ends of the two firing levers corresponding to the free ends of the two elastic locking plates respectively. The front ends of the firing levers abut against the free ends of the elastic locking plates. When the firing levers slide forward axially with the firing element, they force the elastic locking plates to bend and deform away from the movable chamber, thereby releasing the locking groove from locking the locking ear.

[0015] Furthermore, the top of the mounting housing is provided with a cover plate, and an axially extending groove is provided on the cover plate. A loading push block is slidably disposed in the groove. The lower end of the loading push block is fixedly connected to the movable chamber, which is used to drive the movable chamber to move towards the rear end of the mounting housing and compress the first spring to complete loading.

[0016] The semi-automatic tissue sampling puncture device with an integrated safety mechanism disclosed in this utility model is characterized by integrating the safety component onto the firing mechanism. The pressing action of the operating component directly drives the limiting component to switch between the safety state and the released state, realizing a continuous one-handed operation of the safety release and firing action. Compared with existing technologies, this utility model has the following advantages: First, the safety release and firing are integrated into the same pressing action, allowing the operator to complete both without changing their grip posture, significantly simplifying the operation and improving the smoothness and accuracy of the surgery. Second, the limiting component and the operating component adopt a sloped transmission cooperation structure, achieving radial sliding of the limiting component through the interaction between the trigger rod and the trigger slope. The structure is compact and reliable, eliminating the need for a separate safety pin and the risk of the safety pin falling off. Third, the cooperation of the guide chamber, guide part, and limiting component achieves precise control of the sliding path of the firing component, and the second spring ensures that the safety component automatically returns to the safe state, improving the safety of use. In addition, the symmetrical arrangement of the double limiting components and the one-to-one cooperation of the double trigger rods further enhance the stability and reliability of the safety release. Finally, the third and fourth springs respectively realize the reset of the firing component and the operating component, ensuring that the instrument automatically returns to the ready-to-fire state after each firing, facilitating continuous operation. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall three-dimensional structure of a semi-automatic tissue sampling puncture device with an integrated safety mechanism provided for an embodiment of this utility model.

[0018] Figure 2 This is a cross-sectional structural diagram of the semi-automatic tissue sampling puncture device in the safety state according to an embodiment of this utility model.

[0019] Figure 3 This is a cross-sectional structural diagram of the semi-automatic tissue sampling puncture device in the disengaged state according to an embodiment of the present invention.

[0020] Figure 4 This is an exploded structural diagram of the semi-automatic tissue sampling puncture device according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the assembly structure of the firing element and the third spring provided in an embodiment of the present utility model.

[0022] Figure 6 This is a schematic diagram of the assembly structure of the operating component and the fourth spring provided in an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the assembly structure of the limiting member and the second spring provided in an embodiment of the present utility model.

[0024] The following are the markings in the attached diagram:

[0025] 1. Housing; 11. End cap; 12. Guide chamber; 13. Mounting groove; 14. Elastic locking plate; 141. Locking groove; 15. Guide hole; 16. Cover plate; 161. Slide groove; 17. Loading push block; 2. Puncture needle; 3. Movable chamber; 31. Locking ear; 4. First spring; 5. Firing element; 51. Guide part; 511. Guide cavity; 512. Partition; 513. Opening; 52. Third spring; 53. Fourth spring; 54. Firing lever; 6. Safety assembly; 61. Limiting element; 611. Abutment surface; 612. Trigger ramp; 613. Second spring; 62. Operating element; 621. Trigger lever. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] Existing semi-automatic tissue sampling puncture needles require two hands to insert and remove the safety pin, which is cumbersome and carries the risk of dislodgement. Furthermore, the safety release and firing cannot be performed simultaneously with one hand. Therefore, to address these issues, this invention provides a semi-automatic tissue sampling puncture device with an integrated safety mechanism.

[0029] like Figures 1 to 4As shown, the semi-automatic tissue sampling trocar with an integrated safety mechanism provided in this embodiment includes a mounting housing 1, a puncture needle 2, and a loading mechanism disposed within the mounting housing 1. The mounting housing 1 serves as the main support for the entire instrument, and its interior forms cavities for accommodating various components. The loading mechanism includes a movable chamber 3 and a first spring 4. The movable chamber 3 is slidably disposed within the mounting housing 1 along its axial direction. The outer needle tube of the puncture needle 2 is fixedly connected to the front end of the movable chamber 3, so that the axial movement of the movable chamber 3 can drive the outer needle tube of the puncture needle 2 to move synchronously. The two ends of the first spring 4 abut against the inner rear end walls of the movable chamber 3 and the mounting housing 1, respectively. When the movable chamber 3 moves to the rear end, the first spring 4 is compressed and stores energy.

[0030] This embodiment also includes a firing element 5, a safety assembly 6, and a locking assembly. The firing element 5 is slidably disposed at the rear end of the mounting housing 1 along the axial direction of the mounting housing 1. The operator can trigger the sampling action by pressing the firing element 5. The locking assembly is used to lock the loading mechanism. When the movable chamber 3 moves backward into position, the locking assembly holds the movable chamber 3 in a ready-to-fire state. The front end of the firing element 5 cooperates with the locking assembly. When the firing element 5 is pressed, its front end acts on the locking assembly, causing the locking assembly to release the lock on the movable chamber 3. The first spring 4 releases energy to drive the movable chamber 3 to move forward rapidly, causing the outer needle tube to cut the tissue.

[0031] The safety assembly 6 includes a limiting member 61 and an operating member 62. The limiting member 61 is movably disposed at the rear end of the mounting housing 1, and the operating member 62 is disposed on the firing member 5 and engages with the limiting member 61 in a transmission manner. The safety assembly 6 has a locked state and a released state. In the locked state, the limiting member 61 is located on the sliding path of the firing member 5, preventing the firing member 5 from sliding forward and preventing accidental firing. In the released state, the limiting member 61 is removed from the sliding path of the firing member 5, and the firing member 5 can slide forward freely. The operating member 62 responds to the operator's pressing action, driving the limiting member 61 to switch between the locked state and the released state. The operator only needs to press the operating member 62 to release the safety, and continue pressing the same part to complete the firing, realizing a continuous one-handed operation of releasing the safety and firing.

[0032] Specifically, the core working logic of this embodiment is as follows: After the operator completes the loading operation, the movable chamber 3 is locked in the firing position by the locking component. At this time, the safety component 6 is in the safety state, and the limiting component 61 blocks the sliding path of the firing component 5. Even if the firing component 5 is accidentally touched, the firing action cannot be completed, thus achieving safety protection. When puncture sampling is required, the operator holds the mounting shell 1 with one hand and presses the operating component 62 with the thumb, driving the limiting component 61 to switch to the released state. At this time, the sliding path of the firing component 5 is released, and the operator can continue to press to push the firing component 5 to slide axially, triggering the locking component to unlock. The first spring 4 releases energy to drive the movable chamber 3 to move the outer needle tube forward, completing the tissue cutting and sampling. With the above structure, when the operator holds the puncture device with one hand, only the same finger needs to complete the safety release and firing actions in sequence without changing the holding posture, which significantly improves the smoothness and accuracy of the operation.

[0033] As a further preferred technical solution, such as Figure 1 , Figure 2 and Figure 7 As shown, in this embodiment, an end cap 11 is fixed to the rear end of the housing 1, and a guide chamber 12 is provided on the end cap 11. The firing element 5 also includes a guide portion 51 fixedly connected to the firing element 5. The guide portion 51 is slidably disposed in the guide chamber 12 along the axial direction, and the guide chamber 12 provides guidance for the axial sliding of the firing element 5. A mounting groove 13 is provided on the side wall of the guide chamber 12, and a limiting member 61 is slidably disposed in the mounting groove 13. The limiting member 61 has an abutment surface 611 on the side facing the operating member 62. In the safe state, the abutment surface 611 of the limiting member 61 extends out of the inner wall of the guide chamber 12, and the lower end of the guide portion 51 abuts against the abutment surface 611, thereby blocking the axial sliding of the guide portion 51 and locking the firing element 5.

[0034] The end cap 11 is fixed to the rear end of the mounting housing 1 by a snap fastener, sealing the rear cavity of the mounting housing 1 and providing support for the sliding of the firing element 5. The guide chamber 12 is a cylindrical cavity extending axially, which is clearance-fitted with the guide portion 51 of the firing element 5 to ensure that the firing element 5 can only slide smoothly along the axial direction and avoid radial deviation. The mounting groove 13 is a groove radially opened along the side wall 12 of the guide chamber, providing guidance for the sliding of the limiting member 61 and ensuring that the limiting member 61 can only slide radially. The abutment surface 611 is the end face of the limiting member 61 facing the firing direction. It is a plane perpendicular to the axial direction and can stably withstand the axial pressure of the guide portion 51, preventing the limiting member 61 from being accidentally pushed open in the safety state. This structure, through the cooperation between the guide portion 51 and the guide chamber 12, ensures the linearity and stability of the sliding of the firing element 5. At the same time, the abutment surface 611 of the limiting member 61 and the lower end of the guide portion 51 form a reliable mechanical block, resulting in high locking reliability in the safety state.

[0035] Specifically, such as Figure 3 , Figure 4 and Figure 7 As shown, the limiting member 61 has a trigger ramp 612 on the side facing the operating member 62, and the trigger ramp 612 is located in front of the abutment surface 611. The guide part 51 has a guide cavity 511, and the operating member 62 is slidably disposed in the guide cavity 511, which provides guidance for the sliding of the operating member 62. The lower end of the operating member 62 is fixedly provided with a trigger rod 621 that cooperates with the trigger ramp 612. When the operating member 62 is not pressed, under the action of the fourth spring 53, the operating member 62 is in the initial position, the trigger rod 621 does not contact the trigger ramp 612 or only slightly contacts it, the limiting member 61 is in a radially inward extended state under the action of the second spring 613, and the abutment surface 611 extends out of the inner wall of the guide chamber 12 to block the guide part 51. When the operating member 62 is pressed, the operating member 62 slides downward along the guide cavity 511, and the trigger rod 621 moves downward accordingly and contacts the trigger inclined surface 612. The inclined surface cooperates to generate a radially outward component force, which pushes the limiting member 61 to slide radially outward, causing the contact surface 611 to retract into the mounting groove 13, releasing the contact with the lower end of the guide part 51, and the safety component 6 switches to the released state.

[0036] The trigger ramp 612 is an inclined surface oriented towards the pressing direction of the operating member 62, which matches the end ramp of the trigger rod 621. It converts the axial pressing force of the operating member 62 into the radial driving force of the limiting member 61, achieving the function of pressing to unlock. The guide cavity 511 is a cavity opened axially inside the guide portion 51, providing guidance for the sliding of the operating member 62 and ensuring that the operating member 62 can only slide smoothly along the axial direction. The trigger rod 621 is integrally formed with the operating member 62, resulting in high structural strength and stable transmission of pressing force. This ramp transmission structure converts the axial pressing of the operating member 62 into the radial sliding of the limiting member 61. It is compact, reliable in transmission, provides a clear operating feel, and allows the user to clearly perceive the unlocked state.

[0037] Specifically, as shown in the figure Figure 4 and Figure 7 As shown, a second spring 613 is provided between the limiting member 61 and the bottom of the mounting groove 13. The two ends of the second spring 613 abut against the outer end of the limiting member 61 and the bottom of the mounting groove 13, respectively. When the operating member 62 is released, the operating member 62 returns to its original position upward under the action of the fourth spring 53. The trigger rod 621 leaves the trigger inclined surface 612. The elastic restoring force of the second spring 613 drives the limiting member 61 to slide inward radially to return to its original position, so that the abutment surface 611 extends out of the inner wall of the guide chamber 12 again, and the safety component 6 returns to the safety state.

[0038] The second spring 613 is a compression spring that always provides radial inward elastic force to the limiting member 61, ensuring that the limiting member 61 always remains extended from the inner wall of the guide chamber 12 when no external force is applied to the operating member 62, so that the safety component 6 is stably in the safety state and avoids the problem of accidental release of the safety. When the operator releases the operating member 62, the second spring 613 can drive the limiting member 61 to automatically reset and re-enter the safety state without the need for manual reset operation, further improving the convenience and safety of operation.

[0039] Specifically, such as Figure 2 , Figure 5 , Figure 5 and Figure 6 As shown, a partition 512 is provided inside the guide cavity 511, dividing the guide cavity 511 into upper and lower parts. The firing element 5 also includes a third spring 52 and a fourth spring 53. The third spring 52 is located inside the guide chamber 12, with one end abutting against the bottom wall of the guide chamber 12 and the other end abutting against the lower surface of the partition 512. When the firing element 5 is pressed and fired, the firing element 5 moves forward as a whole, and the third spring 52 is compressed; after firing, the elastic restoring force of the third spring 52 drives the firing element 5 to slide backward axially to reset, so that the firing element 5 returns to its initial position. The fourth spring 53 is located between the operating element 62 and the upper surface of the partition 512. When the operating element 62 is pressed, the fourth spring 53 is compressed; after the operating element 62 is released, the elastic restoring force of the fourth spring 53 drives the operating element 62 to slide upward to reset.

[0040] By independently resetting the third spring 52 and the fourth spring 53, it is ensured that the firing element 5 and the operating element 62 can be accurately reset, avoiding mutual interference and improving the reliability of operation and the consistency of reset.

[0041] Specifically, such as Figure 5 As shown, the partition 512 has an opening 513, through which the trigger rod 621 extends into the guide chamber 12 and engages with the triggering inclined surface 612 of the limiting member 61. The opening 513 not only allows the trigger rod 621 to pass through the partition 512 and engage with the limiting member 61 below, but also guides and limits the sliding of the trigger rod 621, preventing it from deflecting during the sliding process.

[0042] Specifically, two limiting members 61 are provided, which are symmetrically slidably disposed on two opposite side walls of the guide chamber 12. Two trigger rods 621 are correspondingly provided on the operating member 62, and each trigger rod 621 corresponds to and engages with the triggering inclined surface 612 of the two limiting members 61. This symmetrically arranged double-limiting member structure ensures that the firing member 5 receives a uniform blocking force in the safe state, preventing deflection or jamming caused by unilateral force. Simultaneously, the two trigger rods drive the two limiting members to move synchronously, ensuring the reliability and consistency of the safety release.

[0043] Specifically, Figures 2 to 4 As shown, the locking assembly includes locking ears 31 symmetrically arranged on the left and right sides of the movable chamber 3, and elastic locking plates 14 symmetrically fixed on the left and right sides of the mounting housing 1. The front end of the elastic locking plate 14 is a fixed end, and the rear end is a free end. The free end of the elastic locking plate 14 has at least one locking groove 141 that mates with the locking ears 31. The locking ears 31 have a wedge-shaped structure and a guide slope at their front end. When the operator drives the movable chamber 3 to move backward by the loading push block 17, the guide slope of the locking ears 31 contacts the free end of the elastic locking plate 14, forcing the elastic locking plate 14 to bend and deform away from the movable chamber 3. The locking ears 31 continue to move backward until they slide into the locking groove 141. The elastic locking plate 14 returns to its original shape, and the locking groove 141 locks the locking ears 31, thus achieving locking in the loading state. The end cap 11 is also provided with a guide hole 15 for the firing rod 54 to pass through. The rear end of the firing rod 54 is fixedly connected to the front end face of the operating member 62, and the front end of the firing rod 54 extends through the guide hole 15 to the inner cavity of the mounting housing 1.

[0044] As an alternative embodiment, those skilled in the art can also provide multiple locking slots 141 on the elastic locking plate 14 according to actual needs, such as providing two locking slots 141, corresponding to two sampling stroke levels of 10mm and 20mm respectively, to meet different clinical sampling needs.

[0045] Specifically, such as Figures 2 to 4 As shown, there are two firing levers 54, with the front ends of each lever corresponding to the free ends of the two elastic locking plates 14. The front ends of the firing levers 54 abut against the free ends of the elastic locking plates 14. When the operator presses the operating component 62 to release the safety, and continues to press the firing component 5, the firing component 5 slides forward as a whole, and the firing levers 54 move forward synchronously with the firing component 5. The front ends of the firing levers 54 push against the free ends of the elastic locking plates 14, forcing the elastic locking plates 14 to bend and deform away from the movable chamber 3, thereby disengaging the locking groove 141 from the locking ear 31 and releasing the lock on the movable chamber 3. At this time, the compressed first spring 4 releases energy, driving the movable chamber 3 to move forward rapidly, causing the outer needle tube of the puncture needle 2 to cut the tissue and complete the sampling.

[0046] As an alternative embodiment, those skilled in the art may also configure the front end of the firing lever 54 as a sloped structure to cooperate with the force-bearing slope of the free end of the elastic locking plate 14, so as to reduce the resistance during the pushing process and make the firing action smoother.

[0047] Specifically, such as Figure 1 and Figure 4 As shown, the top of the mounting housing 1 is provided with a cover plate 16, and a sliding groove 161 extending axially is provided on the cover plate 16. A loading push block 17 is slidably disposed in the sliding groove 161, and the lower end of the loading push block 17 is fixedly connected to the movable chamber 3. The operator can push the loading push block 17 to drive the movable chamber 3 to move towards the rear end of the mounting housing 1, thereby compressing the first spring 4 to complete loading.

[0048] The semi-automatic tissue sampling trocar with an integrated safety mechanism provided in this embodiment works on the following principle: The operator pushes the loading pusher 17 to move the movable chamber 3 backward, causing the locking lug 31 to slide into the locking groove 141. The first spring 4 is compressed, and the instrument is in a ready-to-fire state. At this time, the safety component 6 is in a safe state, and the contact surface 611 of the limiting member 61 prevents the firing member 5 from moving forward. The operator holds the trocar and inserts the puncture needle 2 into the target tissue. Then, the operator presses the operating component 62 with the same finger. The operating component 62 moves downward, causing the trigger rod 621 to press down on the trigger ramp 612 of the limiting member 61, causing the limiting member 61 to slide outward. The contact surface 611 retracts, releasing the obstruction of the firing member 5. The operator continues to press the operating component 62, causing the firing member 5 to move forward as a whole. The firing rod 54 pushes against the elastic locking plate 14, causing it to bend. The locking groove 141 releases the locking lug 31, and the first spring 4 drives the movable chamber 3 to move forward rapidly, completing the tissue cutting and sampling. After the press is released, the third spring 52 drives the firing element 5 to reset, the fourth spring 53 drives the operating element 62 to reset, and the second spring 613 drives the limiting element 61 to reset. The device automatically returns to the safety state and waits for the next operation.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A semi-automatic tissue sampling puncture device with an integrated safety mechanism, comprising a mounting housing, a puncture needle, and a loading mechanism disposed within the mounting housing, the loading mechanism comprising a movable chamber and a first spring, the outer needle tube of the puncture needle being fixedly connected to the front end of the movable chamber, characterized in that, It also includes the firing mechanism, safety mechanism, and locking mechanism; The locking assembly is used to lock the loading mechanism. The firing member is slidably disposed at the rear end of the mounting housing along the axial direction of the mounting housing, and the front end of the firing member cooperates with the locking assembly to release the locking assembly when pressed to trigger the loading mechanism to fire. The safety component includes a limiting member and an operating member. The limiting member is movably disposed at the rear end of the mounting housing, and the operating member is disposed on the firing member and is in a transmission cooperation with the limiting member to drive the limiting member. The safety assembly has a safety state and a release state. In the safety state, the limiting member blocks the sliding path of the firing member, restricting the movement of the firing member relative to the mounting housing. In the released state, the limiting member leaves the sliding path of the firing member, allowing the firing member to move relative to the mounting housing; The operating element responds to the operator's pressing action, driving the limiting element to switch between the locked state and the released state.

2. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 1, characterized in that, An end cap is fixed to the rear end of the mounting housing. A guide chamber is provided on the end cap. The firing element also includes a guide part. The guide part is fixedly connected to the firing element. The guide part is slidably disposed in the guide chamber along the axial direction. An installation groove is provided on the side wall of the guide chamber. The limiting member is slidably disposed in the installation groove. The limiting member has an abutment surface on the side facing the operating member. In the safe state, the abutment surface of the limiting member extends out of the inner wall of the guide chamber, and the lower end of the guide part abuts against the abutment surface, preventing the axial sliding of the guide part.

3. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 2, characterized in that, The limiting member is further provided with a triggering inclined surface on the side facing the operating member, and the triggering inclined surface is located on the front side of the abutment surface; The guide portion has a guide cavity, and the operating element is slidably disposed within the guide cavity; The lower end of the operating component is fixedly provided with a trigger rod that cooperates with the trigger inclined surface; When the operating component is pressed, the trigger rod pushes the limiting component radially outward through the inclined surface, causing the abutment surface to retract into the mounting groove, releasing the abutment on the lower end of the guide portion, and the safety component switches to the released state.

4. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 3, characterized in that, A second spring is provided between the limiting member and the bottom of the mounting groove. The two ends of the second spring abut against the outer end of the limiting member and the bottom of the mounting groove, respectively, to drive the limiting member to slide inward radially to reset, so that the safety component springs back to the safety state.

5. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 3, characterized in that, The guide cavity is provided with a partition, and the firing element also includes a third spring and a fourth spring. The third spring is located in the guide chamber, with one end abutting against the bottom wall of the guide chamber and the other end abutting against the lower surface of the partition, for providing the firing element with a restoring force after being pressed and fired; the fourth spring is located between the operating element and the upper surface of the partition, for providing the operating element with a restoring force after being pressed.

6. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 5, characterized in that, The partition has an opening, and the trigger rod extends through the opening into the guide chamber, engaging with the trigger ramp of the limiting member.

7. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 6, characterized in that, Two limiting components are provided, and the two limiting components are symmetrically slidably disposed on two opposite side walls of the guide chamber. Two trigger rods are correspondingly provided on the operating component, and the two trigger rods are respectively engaged with the trigger inclined surfaces of the two limiting components.

8. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 2, characterized in that, The locking assembly includes locking ears symmetrically arranged on the left and right sides of the movable compartment, and elastic locking plates symmetrically fixed on the left and right sides of the mounting housing; The front end of the elastic locking plate is a fixed end and the rear end is a free end. The free end of the elastic locking plate has at least one locking groove that cooperates with the locking ear. The locking ear is a wedge-shaped structure. When the locking ear moves backward with the movable chamber, it can slide into the locking groove to achieve locking in the loaded state. The end cap is also provided with a guide hole for the firing rod to pass through. The rear end of the firing rod is fixedly connected to the front end face of the operating component, and the front end of the firing rod extends through the guide hole to the inner cavity of the mounting housing.

9. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 8, characterized in that, The firing lever is provided in two parts, and the front ends of the two firing levers correspond one-to-one with the free ends of the two elastic locking plates; The front end of the firing lever abuts against the free end of the elastic locking plate. When the firing lever slides forward axially with the firing element, it forces the elastic locking plate to bend and deform away from the movable chamber, thereby releasing the locking groove from locking the locking ear.

10. The semi-automatic tissue sampling puncture device with an integrated safety mechanism according to claim 1, characterized in that, The top of the mounting housing is provided with a cover plate, and the cover plate has a sliding groove extending along the axis. A loading push block is slidably disposed in the sliding groove. The lower end of the loading push block is fixedly connected to the movable chamber and is used to drive the movable chamber to move towards the rear end of the mounting housing to compress the first spring to complete loading.

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