Piercing device

Abstract

The present invention provides a puncture device, which comprises: a puncture needle assembly, an outer tube, an inner tube, a positioning needle assembly and a radial retaining piece; at least a portion of the inner tube is movably arranged in the outer tube along the central axis of the outer tube relative to the outer tube; at least a portion of the positioning needle assembly is movably arranged in the inner tube along the central axis relative to the inner tube; at least a portion of the puncture needle assembly is movably arranged in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube; the radial retaining piece is arranged between the outer tube and the inner tube, and the inner wall of the outer tube has a first inclined surface gradually inclined outwardly toward the distal end. When the outer tube moves toward the distal end, the first inclined surface pushes at least a portion of the radial retaining piece to move inwardly along the radial direction of the inner tube to an unlocking position. Before the radial retaining piece moves to the unlocking position, the outer tube drives the inner tube to move toward the distal end through the radial retaining piece, and drives the puncture needle assembly to move toward the distal end.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a puncture device. Background Art

[0002] Usually, we deliver drugs and required fluids to patients through catheters or peripheral blood vessels to treat physical diseases. This method can achieve satisfactory therapeutic effects when the patient's blood pressure is stable. However, when the blood pressure drops severely, for example, when the patient suffers from severe trauma or cardiac arrest, intravenous infusion is almost impossible due to the collapse of peripheral blood vessels. In this case, other suitable methods are needed to replace intravenous infusion, and intraosseous infusion can well achieve this expectation. The mechanism of bone marrow infusion is that the bone marrow chamber is composed of a reticular cavernous sinus-like space, which is connected to the vascular circulation through the central canal, nourishing veins and emissary veins. Therefore, drugs and fluids delivered through the bone marrow cavity can enter the blood circulation quickly and effectively. The bone marrow can be regarded as a "blood vessel that will not collapse". Bone marrow infusion is a quick and reliable way to easily establish an infusion channel in special circumstances, such as severe hypovolemic shock, cardiac arrest, a large number of air crash or accident victims who need to be rescued, and the treatment of wounded on the battlefield.

[0003] The time for establishing an infusion channel through bone marrow puncture is generally about 100 seconds, which is much shorter than the time for venous incision and cannulation. The bone marrow cavity contains a rich network of blood vessels. In particular, the dense cortical bone at the sternum is thinner and less. An intraosseous infusion channel can be established using sternal puncture and an intraosseous infusion tube. The infusion tube uses a puncture needle to penetrate the patient's skin, subcutaneous tissue, and cortical bone layer into the bone marrow. The infusion tube can directly deliver drugs or fluids to the intraosseous blood vessels to establish an intraosseous infusion channel. In emergency situations or when a combat injury is in shock, it can save precious time needed for treatment and has an important impact on saving lives. However, sternal puncture has high professional requirements for medical staff, and the puncture depth is also difficult to control and adjust. Summary of the invention

[0004] The object of the present invention is to provide a puncture device to solve at least one of the problems that sternal puncture has high professional requirements for medical personnel, the puncture depth is difficult to control and adjust, and the puncture speed is slow.

[0005] In order to solve the above technical problems, the present invention provides a puncture device, which includes: a puncture needle assembly, an outer tube, an inner tube, a positioning needle assembly and a radial retaining member;

[0006] At least a portion of the inner tube is movably disposed in the outer tube relative to the outer tube along the central axis of the outer tube;

[0007] At least a portion of the positioning needle assembly is movably disposed in the inner tube relative to the inner tube along the central axis;

[0008] At least a portion of the puncture needle assembly is movably disposed in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube;

[0009] The radial retaining member is arranged between the outer tube and the inner tube, and the inner wall of the outer tube has a first inclined surface which is gradually inclined outward toward the distal end. When the outer tube moves toward the distal end, the first inclined surface pushes at least a part of the radial retaining member to move radially inward along the inner tube to an unlocking position. Before the radial retaining member moves to the unlocking position, the outer tube drives the inner tube to move toward the distal end through the radial retaining member, and drives the puncture needle assembly to move toward the distal end; when the radial retaining member moves to the unlocking position, the axial movement of the outer tube relative to the inner tube is decoupled.

[0010] Optionally, the radial retaining member includes a limiting bead, and the inner tube has a first accommodating hole opened on the side wall, the first accommodating hole has a radial inner dimension larger than the diameter of the limiting bead, and the depth of the first accommodating hole along the radial direction of the inner tube is smaller than the diameter of the limiting bead; a part of the limiting bead is movably disposed in the first accommodating hole.

[0011] Optionally, the positioning needle assembly includes a fixing member, and a first accommodating cavity is provided between the outer wall of the fixing member and the inner wall of the inner tube, and the sum of the radial dimension of the first accommodating cavity along the inner tube and the radial depth of the first accommodating hole along the inner tube is not less than the diameter of the limiting bead; the first accommodating cavity is connected to the first accommodating hole for accommodating the entire limiting bead.

[0012] Optionally, the outer wall of the fixing member has a second inclined surface that gradually inclines inwardly toward the distal end, and the first accommodating cavity is located on the distal side of the second inclined surface.

[0013] Optionally, the inner tube has a second accommodating hole opened on the side wall, and the radial clamping member includes a limit card, one end of the limit card is connected to the side wall of the second accommodating hole, and the other end of the limit card can be movably inserted into the second accommodating hole; the limit card has a third inclined surface gradually inclined outward toward the distal end, and the proximal end of the third inclined surface is flush with the outer wall of the inner tube.

[0014] Optionally, the positioning needle assembly includes a fixing member, and a second accommodating cavity is provided between the outer wall of the fixing member and the inner wall of the inner tube, the sum of the radial dimension of the second accommodating cavity along the inner tube and the radial depth of the second accommodating hole along the inner tube is not less than the maximum radial dimension of the limit card along the inner tube; the second accommodating cavity and the second accommodating hole are used to accommodate a part of the limit card with the maximum radial dimension.

[0015] Optionally, the outer wall of the fixing member has a first limiting surface facing the proximal end, which is used to abut against the distal end of the limiting card to limit the axial displacement of the limiting card toward the distal end.

[0016] Optionally, the puncture needle assembly includes: a puncture needle and a proximal cover; the puncture needle is arranged along the central axis and fixedly connected to the proximal cover, and the proximal cover is threadedly connected to the inner tube.

[0017] Optionally, the proximal cover has a second limiting surface facing the distal end, and the second limiting surface is used to abut against the distal end of the outer tube to limit the displacement of the proximal cover along the central axis relative to the outer tube toward the distal end.

[0018] Optionally, the puncture device also includes: a distal cover; the distal cover is connected to the distal end of the outer tube, and is used to abut against the radial retaining member before the radial retaining member moves to the unlocking position to limit the displacement of the inner tube along the central axis relative to the outer tube toward the distal end.

[0019] Optionally, the positioning needle assembly includes: a positioning needle and a fixing member; the positioning needle is fixedly connected to the fixing member, and the fixing member is connected to the inner tube via a spring arranged along the central axis.

[0020] Optionally, the fixing member has a third limiting surface toward the distal end, and the inner tube has a fourth limiting surface toward the proximal end, and the third limiting surface and the fourth limiting surface are used to abut against each other to limit the displacement of the fixing member relative to the inner tube toward the distal end.

[0021] Optionally, the puncture needle assembly includes a puncture needle; the puncture device also includes: an infusion tube; the infusion tube is sleeved outside the puncture needle; the infusion tube is configured to move along the central axis with the movement of the puncture needle.

[0022] Optionally, the positioning needle assembly also includes: an infusion tube fixing clamp; the infusion tube fixing clamp is inserted into the fixing member and connected to the fixing member; the infusion tube fixing clamp can be movably sleeved outside the infusion tube to limit the radial displacement of the infusion tube.

[0023] Optionally, the puncture device also includes: a fixed base; the fixed base is used to be attached to the surface of the puncture target; the fixed base has a positioning hole, which is adapted to the distal end of the positioning needle assembly and is used to locate the distal end position of the positioning needle assembly and for the puncture needle to pass through.

[0024] Optionally, the fixed base includes: an anti-dropping slot; the anti-dropping slot is used to limit the position of the infusion tube.

[0025] Optionally, the puncture device further includes: a base cover; the base cover is detachably connected to the fixed base and is used to cover the positioning hole and the anti-dropping slot.

[0026] In summary, the puncture device provided by the present invention comprises: a puncture needle assembly, an outer tube, an inner tube, a positioning needle assembly and a radial retaining member; at least a portion of the inner tube is movably arranged in the outer tube along the central axis of the outer tube relative to the outer tube; at least a portion of the positioning needle assembly is movably arranged in the inner tube along the central axis relative to the inner tube; at least a portion of the puncture needle assembly is movably arranged in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube; the radial retaining member is arranged Between the outer tube and the inner tube, the inner wall of the outer tube has a first inclined surface which gradually tilts outward toward the distal end. When the outer tube moves toward the distal end, the first inclined surface pushes at least a portion of the radial retaining member to move radially inward along the inner tube to an unlocking position. Before the radial retaining member moves to the unlocking position, the outer tube drives the inner tube to move toward the distal end through the radial retaining member, and drives the puncture needle assembly to move toward the distal end. When the radial retaining member moves to the unlocking position, the axial movement of the outer tube relative to the inner tube is decoupled.

[0027] With such configuration, when the outer tube moves toward the distal end, the radial retaining piece can be used to drive the puncture needle assembly to perform puncture. When the radial retaining piece moves to the unlocked position, the axial movement of the outer tube relative to the inner tube is decoupled to avoid puncturing too deep or too shallow. During use, only the outer tube needs to be operated to complete the puncture. The operator's professional ability requirements are low, and the puncture depth is controllable. The puncture operation is relatively simple and fast, and it is easy to establish an intraosseous infusion channel. In emergency situations or in the event of combat shock, it can save precious time required for treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Those skilled in the art will appreciate that the accompanying drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0029] Figure 1 is a schematic diagram of a longitudinal cross section of a puncture device according to an embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of an infusion tube according to an embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of a fixed base according to an embodiment of the present invention;

[0032] Figure 4 is a schematic diagram of a base cover according to an embodiment of the present invention;

[0033] Figure 5a is a schematic diagram of an inner tube according to an embodiment of the present invention;

[0034] Figure 5b is a schematic diagram of a fixing member according to an embodiment of the present invention;

[0035] Figure 5c is a schematic diagram of a radial retaining member according to an embodiment of the present invention;

[0036] Figure 6a is a schematic diagram of an inner tube according to another preferred example of an embodiment of the present invention;

[0037] Figure 6b is a schematic diagram of a fixing member according to another preferred example of an embodiment of the present invention;

[0038] Figure 6c is a schematic diagram of a radial retaining member according to another preferred example of an embodiment of the present invention;

[0039] Figure 7 is a schematic diagram of the assembly of a fixed base and a base cover according to an embodiment of the present invention;

[0040] Figure 8 is a three-dimensional schematic diagram of a puncture device according to an embodiment of the present invention;

[0041] Figure 9a to Figure 9c It is a schematic diagram of the use process of the puncture device according to one embodiment of the present invention.

[0042] In the attached figure:

[0043] 1-puncture needle; 2-positioning needle; 3-fixing piece; 4-infusion tube fixing clip; 5-inner tube; 6-outer tube; 7-proximal cover; 8-spring; 9-anti-drop buckle; 10-limiting bead; 11-distal cover; 12-infusion tube; 13-fixing base; 14-base cover; 15-anti-drop slot; 16-positioning hole; 17-first accommodating hole; 18-anti-drop buckle mounting hole; 19-third limiting surface; 20-limiting card; 21-fourth limiting surface; 22-second accommodating hole; 23-first limiting surface; 24-third inclined surface; 51-first accommodating cavity; 52-second accommodating cavity; 61-first inclined surface; 62-second inclined surface. DETAILED DESCRIPTION

[0044] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0045] As used in the present invention, the singular forms "a", "an" and "the" include plural objects, the term "or" is generally used in a sense including "and / or", the term "several" is generally used in a sense including "at least one", and the term "at least two" is generally used in a sense including "two or more". In addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features. The term "proximal end" is usually the end close to the operator, and the term "distal end" is usually the end close to the patient, that is, the end close to the puncture object. "One end" and "the other end" as well as "proximal end" and "distal end" usually refer to two corresponding parts, which not only include the endpoints. The terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of the two elements or the interaction relationship between the two elements. In addition, as used in the present invention, an element is arranged on another element, which usually only means that there is a connection, coupling, matching or transmission relationship between the two elements, and the connection, coupling, matching or transmission between the two elements can be direct or indirect through an intermediate element, but it cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, an element can be in any orientation such as inside, outside, above, below or on one side of another element, unless the content clearly indicates otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The core idea of ​​the present invention is to provide a puncture device to solve at least one of the problems that sternal puncture has high professional requirements for medical personnel, the puncture depth is difficult to control and adjust, and the puncture speed is slow.

[0047] The following description is given with reference to the accompanying drawings.

[0048] Please refer to Figures 1 to 9c ,in, Figure 1is a schematic diagram of a longitudinal cross section of a puncture device according to an embodiment of the present invention; Figure 2 is a schematic diagram of an infusion tube according to an embodiment of the present invention; Figure 3 is a schematic diagram of a fixed base according to an embodiment of the present invention; Figure 4 is a schematic diagram of a base cover according to an embodiment of the present invention; Figure 5a is a schematic diagram of an inner tube according to an embodiment of the present invention; Figure 5b is a schematic diagram of a fixing member according to an embodiment of the present invention; Figure 5c is a schematic diagram of a radial retaining member according to an embodiment of the present invention; Figure 6a is a schematic diagram of an inner tube according to another preferred example of an embodiment of the present invention; Figure 6b is a schematic diagram of a fixing member according to another preferred example of an embodiment of the present invention; Figure 6c is a schematic diagram of a radial retaining member according to another preferred example of an embodiment of the present invention; Figure 7 is a schematic diagram of the assembly of a fixed base and a base cover according to an embodiment of the present invention; Figure 8 is a three-dimensional schematic diagram of a puncture device according to an embodiment of the present invention; Figure 9a to Figure 9c It is a schematic diagram of the use process of the puncture device according to one embodiment of the present invention.

[0049] One embodiment of the present invention provides a puncture device, which includes: a puncture needle assembly, an outer tube 6, an inner tube 5, a positioning needle assembly and a radial retaining member; at least a portion of the inner tube 5 is movably arranged in the outer tube 6 along the central axis of the outer tube 6 relative to the outer tube 6; at least a portion of the positioning needle assembly is movably arranged in the inner tube 5 along the central axis relative to the inner tube 5; at least a portion of the puncture needle assembly is movably arranged in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube 5; the radial retaining member is arranged Between the outer tube 6 and the inner tube 5, the inner wall of the outer tube 6 has a first inclined surface 61 which is gradually inclined outward toward the distal end. When the outer tube 6 moves toward the distal end, the first inclined surface 61 pushes at least a portion of the radial retaining member to move radially inward along the inner tube 5 to an unlocking position. Before the radial retaining member moves to the unlocking position, the outer tube 6 drives the inner tube 5 to move toward the distal end through the radial retaining member, and drives the puncture needle assembly to move toward the distal end; when the radial retaining member moves to the unlocking position, the axial movement of the outer tube 6 relative to the inner tube 5 is decoupled.

[0050] Please refer to Figure 1 , Figure 5aIn an alternative embodiment, the radial retaining member includes a limiting bead 10, and the inner tube 5 has a first accommodating hole 17 opened on the side wall, the inner dimension of the first accommodating hole 17 along its own radial direction is larger than the diameter of the limiting bead 10, and the depth of the first accommodating hole 17 along the radial direction of the inner tube 5 is smaller than the diameter of the limiting bead 10; a part of the limiting bead 10 is movably arranged in the first accommodating hole 17. It should be noted that the inner dimension of the first accommodating hole 17 along its own radial direction refers to the minimum inner dimension of the first accommodating hole 17 along its own radial direction. For example, when the first accommodating hole 17 is a circular hole, it can be understood that its inner dimension along its own radial direction is the inner diameter of the circular hole. Here, there is no special restriction on the shape of the first accommodating hole 17. For example, the cross section of the first accommodating hole 17 can be a polygon, and its inner dimension along its own radial direction is the diameter of the inscribed circle of the polygon. With such configuration, when the outer tube 6 moves toward the distal end, the first inclined surface 61 can push the limiting bead 10 to move inwardly in the first accommodating hole 17 along the radial direction of the inner tube 5 until the outermost side of the limiting bead 10 is completely pushed into the outer surface of the inner tube 5, that is, the limiting bead 10 moves to the unlocking position, such as Figure 5c As shown. When the limiting bead 10 moves to the unlocking position, the limiting bead 10 does not protrude from the outer surface of the inner tube 5, that is, it will not affect the relative axial movement of the outer tube 6 and the inner tube 5, thereby decoupling the axial movement of the outer tube 6 relative to the inner tube 5. Before the limiting bead 10 is completely pushed into the inner tube 5, that is, before the limiting bead 10 moves to the unlocking position, the outer tube 6 and the inner tube 5 can transmit axial force due to the locking of the limiting bead 10, so that the inner tube 5 moves following the movement of the outer tube 6 toward the distal end. The puncture needle assembly is connected to the inner tube 5, and when the inner tube 5 moves, the puncture needle assembly is synchronously driven to move, so that when the outer tube 6 moves toward the distal end, the puncture needle assembly is driven by the limiting bead 10 to perform puncture. When the limiting bead 10 moves to the unlocked position, the axial movement of the outer tube 6 relative to the inner tube 5 is decoupled to avoid puncturing too deep or too shallow. During use, only the outer tube 6 needs to be operated to complete the puncture, and the operator's professional ability requirements are low. The depth of puncture is controllable, the puncture operation is relatively simple and fast, and it is easy to establish an intraosseous infusion channel, which can save precious time required for treatment in emergency situations or combat shock. Optionally, the radial retaining member includes more than two limiting beads 10, and the more than two limiting beads 10 are distributed circumferentially around the central axis. Correspondingly, the inner tube 5 has a plurality of first accommodating holes 17.

[0051] Preferably, the positioning needle assembly includes a positioning needle 2 and a fixing member 3; the positioning needle 2 is fixedly connected to the fixing member 3. The positioning needle 2 is used to puncture the patient's superficial skin to reach the surface of the sternum, and fix the position of the puncture device relative to the patient's puncture site. A first accommodating chamber 51 is provided between the outer wall of the fixing member 3 and the inner wall of the inner tube 5, and the sum of the radial dimension of the first accommodating chamber 51 along the inner tube 5 and the radial depth of the first accommodating hole 17 along the inner tube 5 is not less than the diameter of the limiting bead 10; the first accommodating chamber 51 is connected to the first accommodating hole 17, and is used to accommodate the entire limiting bead 10. Since the limiting bead 10 needs to be completely pushed into the inner tube 5 to achieve the decoupling of the axial movement of the outer tube 6 and the inner tube 5, the provision of the first accommodating chamber 51 satisfies the requirement for the limiting bead 10 to move inward.

[0052] Furthermore, the outer wall of the fixing member 3 has a second inclined surface 62 which gradually tilts inwards toward the distal end, and the first accommodating cavity 51 is located at the distal side of the second inclined surface 62. For the convenience of description, an initial state is set for the puncture device. When the puncture device is in the initial state, the first inclined surface 61 is not in contact with the limiting bead 10, or the first inclined surface 61 is in contact with the limiting bead 10 but has not yet pushed the limiting bead 10 inwards. Figure 1 That is, it shows the state of the puncture device when it is in the initial state. When the puncture device is in the initial state, the limiting bead 10 needs to protrude from the outer surface of the inner tube 5 so that the outer tube 6 and the inner tube 5 form a locking position and can transmit the axial force. The setting of the second inclined surface 62 ensures that the limiting bead 10 can protrude from the inner tube 5. In an exemplary embodiment, the distal end of the second inclined surface 62 is connected to the inner side surface of the first accommodating cavity 51, and the proximal end of the second inclined surface 62 is against the inner wall of the inner tube 5; when the puncture device is in the initial state, the part of the second inclined surface 62 close to the proximal end is aligned with the first accommodating hole 17, so that by abutting against the limiting bead 10, the limiting bead 10 is pushed out of the inner tube 5. Since the positioning needle 2 is limited by the sternum after puncturing the patient's surface skin and reaching the surface of the sternum, and cannot continue to move distally, when the outer tube 6 moves distally and drives the inner tube 5 to move distally through the limiting bead 10, the axial position of the fixing member 3 remains fixed, and the second inclined surface 62 is gradually inclined inward toward the distal end, and the limiting bead 10 also moves toward the distal end, which is similar to moving downhill relative to the second inclined surface 62, so the limiting bead 10 can be gradually pushed inward by the first inclined surface 61 until the limiting bead 10 is pushed into the first accommodating cavity 51. With such a configuration, on the one hand, the radial position of the limiting bead 10 can be limited by the setting of the second inclined surface 62, and on the other hand, the proximal end of the second inclined surface 62 abuts against the inner wall of the inner tube 5, which can limit the radial displacement of the fixing member 3 relative to the inner tube 5 and prevent the fixing member 3 from having radial deviation.

[0053] Preferably, the puncture needle assembly comprises: a puncture needle 1 and a proximal cover 7; the puncture needle 1 is arranged along the central axis and fixedly connected to the proximal cover 7, and the proximal cover 7 is threadedly connected to the inner tube 5. In one embodiment, the proximal cover 7 is threadedly connected to the inner tube 5 through an anti-drop buckle 9. Specifically, the proximal end of the inner tube 5 has an anti-drop buckle mounting hole 18, and the outer wall of the anti-drop buckle 9 is snap-connected with the anti-drop buckle mounting hole 18 to achieve a fixed connection with the inner tube 5. The anti-drop buckle 9 has a screw hole, and the screw hole has an internal thread, and the proximal cover 7 has an external thread that matches the internal thread of the screw hole, and the proximal cover 7 is connected to the anti-drop buckle 9 through a thread. With such a configuration, after the puncture needle 1 is inserted into the sternum, the puncture depth of the puncture needle 1 can be adjusted by rotating the proximal cover 7 to meet the infusion requirements.

[0054] Combine the following Figure 9a to Figure 9c , explaining the use process of the puncture device. Figure 9a The puncture needle 1 and the positioning needle 2 of the puncture device penetrate the surface skin and reach the surface of the sternum, and the puncture needle assembly is about to start puncture. Figure 9a In the embodiment, the puncture device is in the initial state.

[0055] Please refer to Figure 9b , which shows the state when the puncture begins. Specifically, the operator holds the outer tube 6 with both hands, with the thumbs pointing downward and the proximal cover 7 facing the operator, and presses the outer tube 6 downward (i.e., toward the distal direction), and the inner tube 5 is positioned by the limiting bead 10 and moves downward with the outer tube 6, driving the anti-drop buckle 9, the proximal cover 7 and the puncture needle 1 to move downward together, while the positioning needle assembly is limited by the sternum and remains motionless, thereby the puncture needle 1 performs the puncture.

[0056] Please refer to Fig.9c , which shows the state when the puncture is completed. Specifically, the limiting bead 10 is pushed into the outer surface of the inner tube 5 by the first inclined surface 61, and is accommodated in the first accommodation cavity 51 and the first accommodation hole 17, that is, the limiting bead 10 moves to the unlocked position, and continuing to press down the outer tube 6 will not continue to drive the puncture needle 1 to continue puncturing. Those skilled in the art can understand that the puncture depth of the puncture needle 1 can be adjusted by setting the length and angle of the second inclined surface 62, thereby ensuring that the puncture depth will not be affected by the operator, the puncture depth is controllable, and the puncture operation is relatively simple and fast.

[0057] Please refer to Figure 5bFurther, the fixing member 3 has a third limiting surface 19 facing the distal end, and the inner tube 5 has a fourth limiting surface 21 facing the proximal end, and the third limiting surface 19 and the fourth limiting surface 21 are used to abut against each other to limit the displacement of the fixing member 3 relative to the inner tube 5 toward the distal end. In an exemplary embodiment, the fixing member 3 has a first limiting ring protruding outward on one side close to the distal end, and the distal end surface of the first limiting ring is configured as the third limiting surface 19, and the distal end of the inner tube 5 has a second limiting ring protruding inward, and the proximal end surface of the second limiting ring is configured as the fourth limiting surface 21. It can be understood that the inner diameter of the second limiting ring is not less than the outer diameter of the main body of the fixing member 3, and the distal end of the fixing member 3 (i.e., a section located at the more distal end of the first limiting ring) can freely pass through the second limiting ring. The outer diameter of the first limiting ring is larger than the inner diameter of the second limiting ring, and the outer diameter of the first limiting ring is smaller than the inner diameter of the main body of the inner tube 5. With such configuration, when the first limiting ring abuts against the second limiting ring, the displacement of the fixing member 3 relative to the inner tube 5 toward the distal end is limited.

[0058] Optionally, the fixing member 3 is connected to the inner tube 5 by a spring 8 arranged along the central axis. Preferably, one end of the spring 8 is abutted against the proximal end of the fixing member 3, and the other end of the spring 8 is abutted against the anti-drop buckle 9. Since the anti-drop buckle 9 is fixedly connected to the inner tube 5, the fixing member 3 is connected to the inner tube 5 by the spring 8. It should be understood that after the spring 8 is assembled between the fixing member 3 and the inner tube 5, it is in a compressed state, so that the threaded connection between the proximal cover 7 and the anti-drop buckle 9 is eliminated, so that the process of rotating the proximal cover 7 to drive the puncture needle 1 to advance and retreat is more linear and reliable, and will not cause jumping due to loose thread matching. In addition, the setting of the spring 8 can make the first limiting ring and the second limiting ring abut against each other by being pushed by elastic force when the puncture device is in the initial state, so that the axial position of the fixing member 3 relative to the inner tube 5 remains fixed, which is convenient for stabilizing the radial position of the limiting bead 10 through the second inclined surface 62.

[0059] Please refer to Figure 1 and Figure 8 Optionally, the puncture device further includes: a distal cover 11; the distal cover 11 is connected to the distal end of the outer tube 6, and is used to abut against the limiting bead 10 before the limiting bead 10 moves to the unlocking position, so as to limit the displacement of the inner tube 6 along the central axis relative to the outer tube 6 toward the distal end. The distal cover 11 can be connected to the outer tube 6 by gluing, and the setting of the distal cover 11 can limit the displacement of the inner tube 5 toward the distal end by abutting against the limiting bead 10 before the limiting bead 10 is pushed into the inner tube 5, so as to prevent the inner tube 5 from falling out under the elastic force of the spring 8.

[0060] Preferably, the proximal cover 7 has a second limiting surface facing the distal end, and the second limiting surface is used to abut against the distal end of the outer tube 6 to limit the displacement of the proximal cover 7 along the central axis relative to the outer tube 6 toward the distal end. Figure 1 As shown, when the puncture device is in the initial state, the proximal cover 7 abuts against the distal end of the outer tube 6 through the second limiting surface, which can prevent the inner tube 5 from coming out under the elastic force of the spring 8. The second limiting surface and the distal cover 11 have overlapping functions, and the two can be set either one, and of course, preferably, both are set together to further improve reliability.

[0061] Please refer to Figure 2 Preferably, the puncture device further includes: an infusion tube 12; the infusion tube 12 is sleeved outside the puncture needle 1; the infusion tube 12 is configured to move with the movement of the puncture needle 1 along the central axis. The infusion tube 12 is sleeved on the puncture needle 1 and is used to enter the bone marrow together with the puncture needle 1 to achieve bone marrow infusion. When the puncture is completed, the resistance at the distal end of the puncture needle 1 will be greatly reduced. The depth of the puncture needle 1 and the infusion tube 12 in the bone marrow can be adjusted by rotating the proximal cover 7. Furthermore, after the puncture is completed, the operator can pull the puncture device out of the patient's sternum, and the infusion tube 12 will be stuck on the sternum due to the friction resistance with the sternum, thereby achieving separation from the puncture needle 1, and the distal part of the infusion tube 12 is left in the bone marrow cavity for subsequent infusion.

[0062] Preferably, the positioning needle assembly also includes: an infusion tube fixing clamp 4; the infusion tube fixing clamp 4 is inserted into the fixing member 3 and connected to the fixing member 3; for example, the infusion tube fixing clamp 4 is fixed in the cavity of the positioning needle fixing member 3 through a tail end protrusion structure, and the infusion tube fixing clamp 4 can be movably mounted outside the infusion tube 12 to limit the radial displacement of the infusion tube 12.

[0063] Please refer to Figure 3Preferably, the puncture device further comprises: a fixed base 13; the fixed base 13 is used to be attached to the surface of the puncture target; the fixed base 13 has a positioning hole 16, the positioning hole 16 is adapted to the distal end of the positioning needle assembly, is used to locate the distal end position of the positioning needle assembly, and is used for the puncture needle 1 to pass through. Specifically, the fixed base 13 is used to be placed just above the sternum before puncture, and the positioning hole 16 is used to provide a precise puncture point. The positioning hole 16 is preferably set at the center of the fixed base 13, and the diameter of the positioning hole 16 is slightly larger than the distal diameter of the fixing member 3, so that the distal end of the fixing member 3 can be accommodated and limited. Preferably, the positioning hole 16 also has a plurality of partitions, and the partitions divide the positioning hole 16 into a positioning needle hole and a puncture needle hole, the positioning needle hole is adapted to the distribution of the positioning needle 2, and the positioning needle 2 is inserted, and the inner diameter of the puncture needle hole is adapted to the outer diameter of the puncture needle 1 and the infusion tube 12, and the puncture needle 1 and the infusion tube 12 can pass through. In addition to providing a precise puncture point for puncture, the positioning hole 16 can also provide a certain resistance for the infusion tube 12 to remain in the bone marrow cavity when the puncture device is pulled out from the patient's sternum.

[0064] Furthermore, the fixing base 13 includes an anti-dropout slot 15; the anti-dropout slot 15 is used to limit the position of the infusion tube 12. Optionally, the inner dimension of the anti-dropout slot 15 is slightly smaller than the outer diameter of the infusion tube 12. After the puncture is completed and the puncture device is pulled out from the patient's sternum, the part of the infusion tube 12 outside the body can be bent and fixed on the anti-dropout slot 15 to complete the secondary fixation, thereby preventing the part of the infusion tube 12 outside the body from freely moving and causing unexpected problems.

[0065] Please refer to Figure 4 and Figure 7 Furthermore, the puncture device further comprises: a base cover 14; the base cover 14 is detachably connected to the fixed base 13, and is used to cover the positioning hole 16 and the anti-dropping slot 15, so as to protect the positioning hole 16 and the anti-dropping slot 15. After the puncture device is pulled out from the patient's sternum, the positioning hole 16 is the location of the puncture hole, and the base cover 14 covers the positioning hole 16 and the anti-dropping slot 15 to prevent the punctured location from being contaminated, and prevents the section of the infusion tube 12 between the anti-dropping slot 15 and the puncture location from being moved, thereby avoiding adverse effects on the puncture location.

[0066] Please refer to Figure 6a to Figure 6c, this embodiment provides another preferred example of the inner tube, the fixing member and the radial retaining member. In another preferred example, the inner tube 5 has a second accommodating hole 22 opened on the side wall, and the radial retaining member includes a limit card 20, one end of the limit card 20 is connected to the side wall of the second accommodating hole 22, and the other end of the limit card 20 is movably inserted into the second accommodating hole 22; the limit card 20 has a third inclined surface 24 that gradually tilts outward toward the distal end, and the proximal end of the third inclined surface 24 is flush with the outer wall of the inner tube 5. In this configuration, when the outer tube 6 moves toward the distal end, the first inclined surface 61 can push the third inclined surface 24 to move radially along the inner tube 5 into the second accommodating hole 22 until the outermost side of the limit card 20 is completely pushed into the outer surface of the inner tube 5, that is, the limit card 20 moves to the unlocked position, such as Figure 6c As shown. When the limit card 20 moves to the unlocking position, the outermost side of the limit card 20 does not protrude from the outer surface of the inner tube 5, that is, it will not affect the relative axial movement of the outer tube 6 and the inner tube 5, thereby decoupling the axial movement of the outer tube 6 relative to the inner tube 5. Before the limit card 20 is completely pushed into the inner tube 5, that is, before the limit card 20 moves to the unlocking position, the outer tube 6 and the inner tube 5 can transmit axial force due to the clamping of the limit card 20, so that the inner tube 5 moves along with the movement of the outer tube 6 toward the distal end. When the inner tube 5 moves, the puncture needle assembly is driven to move synchronously, so that when the outer tube 6 moves toward the distal end, the puncture needle assembly is driven by the limit card 20 to perform puncture, and when the limit card 20 moves to the unlocking position, the axial movement of the outer tube 6 relative to the inner tube 5 is decoupled to avoid puncturing too deep or too shallow. Optionally, the radial clamping member includes more than two limit cards 20, and the more than two limit cards 20 are circumferentially distributed around the central axis. Correspondingly, the inner tube 5 has a plurality of second accommodating holes 22 .

[0067] Preferably, a second accommodating cavity 52 is provided between the outer wall of the fixing member 3 and the inner wall of the inner tube 5, and the sum of the radial dimension of the second accommodating cavity 52 along the inner tube 5 and the depth of the second accommodating hole 22 along the radial direction of the inner tube 5 is not less than the maximum radial dimension of the limit card 20 along the inner tube 5; the second accommodating cavity 52 and the second accommodating hole 22 are used to accommodate a portion of the limit card 20 with the maximum radial dimension. The setting principle of the second accommodating cavity 52 is similar to that of the first accommodating cavity 51, and the second accommodating cavity 52 is provided in combination with the second accommodating cavity 52. Figure 6c When the limit card 20 is pushed by the first inclined surface 61 and moves radially inward, a space for the limit card 20 to enter needs to be reserved at the corresponding position.

[0068] Optionally, the outer wall of the fixing member 3 has a first limiting surface 23 facing the proximal end, which is used to abut against the distal end of the limiting card 20 to limit the axial displacement of the limiting card 20 toward the distal end. In the scheme using the limiting bead 10, due to the setting of the second inclined surface 62, the limiting bead 10 will not actively pop out after being pushed into the inner tube 5. In the preferred example of using the limiting card 20, since one end of the limiting card 20 is connected to the side wall of the second accommodating hole 22, after being pushed into the inner tube 5 by the first inclined surface 61, the limiting card 20 has a tendency to actively pop out. This outward popping tendency will cause a certain friction between the limiting card 20 and the outer tube 6. If the axial displacement of the limiting card 20 is not limited, the movement of the outer tube 6 toward the distal end will drive the limiting card 20 to continue to move toward the distal end through the friction, so that the puncture depth of the puncture needle 1 is uncontrolled. The setting of the first limiting surface 23 can effectively avoid this problem. The first limiting surface 23 abuts against the distal end of the limiting card 20 to limit the limiting card 20 from moving further toward the distal end, so that the inner tube 5 and the puncture needle 1 are limited in displacement toward the distal end, thereby achieving control of the puncture depth of the puncture needle 1. It can be understood that the puncture depth of the puncture needle 1 can be adjusted by adjusting the position of the first limiting surface 23.

[0069] In summary, the puncture device provided by the present invention comprises: a puncture needle assembly, an outer tube, an inner tube, a positioning needle assembly and a radial retaining member; at least a portion of the inner tube is movably arranged in the outer tube along the central axis of the outer tube relative to the outer tube; at least a portion of the positioning needle assembly is movably arranged in the inner tube along the central axis relative to the inner tube; at least a portion of the puncture needle assembly is movably arranged in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube; the radial retaining member is Placed between the outer tube and the inner tube, the inner wall of the outer tube has a first inclined surface that gradually tilts outward toward the distal end. When the outer tube moves toward the distal end, the first inclined surface pushes at least a portion of the radial retaining member to move radially inward along the inner tube to an unlocking position. Before the radial retaining member moves to the unlocking position, the outer tube drives the inner tube to move toward the distal end through the radial retaining member, and drives the puncture needle assembly to move toward the distal end; when the radial retaining member moves to the unlocking position, the axial movement of the outer tube relative to the inner tube is decoupled. With such configuration, when the outer tube moves toward the distal end, the radial retaining piece can be used to drive the puncture needle assembly to perform puncture. When the radial retaining piece moves to the unlocked position, the axial movement of the outer tube relative to the inner tube is decoupled to avoid puncturing too deep or too shallow. During use, only the outer tube needs to be operated to complete the puncture. The operator's professional ability requirements are low, and the puncture depth is controllable. The puncture operation is relatively simple and fast, and it is easy to establish an intraosseous infusion channel. In emergency situations or in the event of combat shock, it can save precious time required for treatment.

[0070] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A puncture device, characterized in that: include: A puncture needle assembly, an outer tube, an inner tube, a positioning needle assembly and a radial retaining member; At least a portion of the inner tube is movably disposed in the outer tube relative to the outer tube along the central axis of the outer tube; At least a portion of the positioning needle assembly is movably disposed in the inner tube relative to the inner tube along the central axis; At least a portion of the puncture needle assembly is movably disposed in the positioning needle assembly along the central axis relative to the positioning needle assembly; the puncture needle assembly is connected to the inner tube; the puncture needle assembly comprises a puncture needle and a proximal cover, the puncture needle is disposed along the central axis, and the proximal cover is fixedly connected to the puncture needle; The positioning pin assembly comprises: a positioning pin and a fixing member; The positioning needle is fixedly connected to the fixing member, and the fixing member is connected to the inner tube via a spring arranged along the central axis; The radial retaining member is arranged between the outer tube and the inner tube, and the inner wall of the outer tube has a first inclined surface which is gradually inclined outward toward the distal end. When the outer tube moves toward the distal end, the first inclined surface pushes at least a part of the radial retaining member to move radially inward along the inner tube to an unlocking position. Before the radial retaining member moves to the unlocking position, the outer tube drives the inner tube to move toward the distal end through the radial retaining member, and drives the puncture needle assembly to move toward the distal end; when the radial retaining member moves to the unlocking position, the axial movement of the outer tube relative to the inner tube is decoupled.

2. The puncture device according to claim 1, characterized in that: The radial retaining member includes a limiting bead, and the inner tube has a first accommodating hole opened on the side wall. The radial inner dimension of the first accommodating hole is larger than the diameter of the limiting bead, and the depth of the first accommodating hole along the radial direction of the inner tube is smaller than the diameter of the limiting bead; a part of the limiting bead is movably arranged in the first accommodating hole.

3. The puncture device according to claim 2, characterized in that: The positioning needle assembly includes a fixing member, and a first accommodating cavity is provided between the outer wall of the fixing member and the inner wall of the inner tube, the sum of the radial dimension of the first accommodating cavity along the inner tube and the radial depth of the first accommodating hole along the inner tube is not less than the diameter of the limiting bead; the first accommodating cavity is connected to the first accommodating hole for accommodating the entire limiting bead.

4. The puncture device according to claim 3, characterized in that: The outer wall of the fixing member has a second inclined surface which gradually inclines inwards toward the distal end, and the first accommodating cavity is located at the distal end side of the second inclined surface.

5. The puncture device according to claim 1, characterized in that: The inner tube has a second accommodating hole opened on the side wall, and the radial clamping member includes a limit card, one end of the limit card is connected to the side wall of the second accommodating hole, and the other end of the limit card can be movably inserted into the second accommodating hole; the limit card has a third inclined surface gradually inclined outward toward the distal end, and the proximal end of the third inclined surface is flush with the outer wall of the inner tube.

6. The puncture device according to claim 5, characterized in that: The positioning needle assembly includes a fixing member, and a second accommodating cavity is provided between the outer wall of the fixing member and the inner wall of the inner tube, the sum of the radial dimension of the second accommodating cavity along the inner tube and the radial depth of the second accommodating hole along the inner tube is not less than the maximum radial dimension of the limit card along the inner tube; the second accommodating cavity and the second accommodating hole are used to accommodate a part of the limit card with the maximum radial dimension.

7. The puncture device according to claim 6, characterized in that: The outer wall of the fixing member has a first limiting surface facing the proximal end, which is used to abut against the distal end of the limiting card to limit the axial displacement of the limiting card toward the distal end.

8. The puncture device according to claim 1, characterized in that: The proximal end cover has a second limit surface facing the distal end, and the second limit surface is used to abut against the distal end of the outer tube to limit the displacement of the proximal end cover along the central axis relative to the outer tube toward the distal end.

9. The puncture device according to claim 1, characterized in that: Also includes: Distal cover; the distal cover is connected to the distal end of the outer tube and is used to abut against the radial retaining member before the radial retaining member moves to the unlocking position to limit the displacement of the inner tube along the central axis relative to the outer tube toward the distal end.

10. The puncture device according to claim 1, characterized in that: The fixing member has a third limiting surface toward the distal end, and the inner tube has a fourth limiting surface toward the proximal end. The third limiting surface and the fourth limiting surface are used to abut against each other to limit the displacement of the fixing member relative to the inner tube toward the distal end.

11. The puncture device according to claim 1, characterized in that: The puncture device further comprises: an infusion tube; the infusion tube is sleeved outside the puncture needle; the infusion tube is configured to move along the central axis with the movement of the puncture needle.

12. The puncture device according to claim 11, characterized in that: The positioning needle assembly also includes: an infusion tube fixing clamp; the infusion tube fixing clamp is inserted into the fixing member and connected to the fixing member; the infusion tube fixing clamp can be movably sleeved outside the infusion tube to limit the radial displacement of the infusion tube.

13. The puncture device according to claim 11, characterized in that: Also includes: A fixed base; the fixed base is used to be attached to the surface of the puncture target; the fixed base has a positioning hole, which is adapted to the distal end of the positioning needle assembly and is used to locate the distal end position of the positioning needle assembly and for the puncture needle to pass through.

14. The puncture device according to claim 13, characterized in that: The fixed base comprises: an anti-dropping slot; the anti-dropping slot is used to limit the position of the infusion tube.

15. The puncture device according to claim 14, characterized in that: The puncture device further comprises: a base cover; the base cover is detachably connected to the fixed base and is used for covering the positioning hole and the anti-dropping slot.

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