Hydraulically-driven telescopic puncture needle

Abstract

The invention discloses a hydraulically-driven telescopic puncture needle, belongs to the field of medical supplies, and aims to improve the precision of puncture operation and avoid excessive bending of a needle body. The puncture needle mainly comprises a needle head part, a needle head steering gear, a needle tube inner ring and a needle tube outer ring. The needle head part is provided with a needle tip and a cutting edge, flexible swinging and autorotation can be achieved, and the needle head part adapts to complex puncture paths. The needle head steering gear directly acts on the needle head through hydraulic control, swinging and autorotation of the needle head are achieved, and operation accuracy is improved. The inner ring and the outer ring of the needle tube are mutually nested to form a telescopic needle body structure, so that the needle tube can be effectively prevented from being excessively bent, and the length can be adjusted according to actual requirements. In addition, the puncture needle adopts a hydraulic driving mode, thrust directly acts on the needle head, error accumulation is reduced, and the puncture precision is improved. The overall design effectively solves the problems of warping and error accumulation of a common flexible needle, and has higher accuracy and safety.

Description

Technical Field

[0001] The invention relates to the technical field of medical supplies, in particular to a hydraulically driven retractable puncture needle. Background Art

[0002] Percutaneous puncture is a typical minimally invasive interventional surgery. It has extremely important clinical applications in the diagnosis and treatment of diseased tissue biopsy, ablation, radiotherapy, etc. It is the main method for early diagnosis and treatment of cancer. Early puncture technology mainly relied on traditional rigid needles, and could only perform simple acupuncture, sampling and other operations. Although these needles are functionally capable of completing puncture tasks, due to their hardness and rigidity, they cannot adapt to the complex anatomical structure of the human body during operation and can easily cause tissue damage. With the advent of high-performance flexible materials, scientists have begun to try to apply these materials to medical devices. Medical researchers have found that flexible needles can use the bending of flexible needles to avoid sensitive areas such as blood vessels and nerves, and flexibly reach lesions that are difficult to reach with traditional rigid needles, greatly expanding the needle insertion options for safe puncture and reducing surgical risks.

[0003] The inventors found in actual research that the flexible needle may bend uncontrollably during the puncture process, especially when the local resistance at the needle tip is large. The insertion method of the conventional flexible needle pushing the needle tail will cause a large error, and the longer the puncture path, the greater the error accumulation. In addition, in the process of needle body shape reconstruction, the puncture trajectory of the flexible needle is almost always reconstructed as an ideal arc. However, if the bending of the needle body during a needle insertion process is considered in practice, as the puncture depth increases, the deformation of the flexible needle will naturally increase. According to Hooke's law, the bending radius of the needle body should gradually increase. Using an ideal arc to reconstruct the needle body shape ignores the bending characteristics of the flexible needle itself, resulting in possible error accumulation.

[0004] Therefore, it is necessary to design a novel puncture needle to solve the above-mentioned technical problems. Summary of the invention

[0005] Based on the above problems, the present invention designs a retractable puncture needle, which solves the problem of uncontrollable bending of the needle body due to excessive local resistance at the needle tip and inaccurate reconstruction of the needle body shape with a circular arc, thereby improving the safety of the puncture operation and the accuracy of the puncture. The puncture needle relies on the inner ring and the outer ring to be nested with each other, and has very little elasticity compared to the flexible needle, so it effectively reduces the error in the reconstruction of the needle body shape, and the contact between the edges of the outer ring when bending can also prevent excessive bending, solving the problem of uncontrollable bending that may occur when the local puncture resistance at the needle tip is too large.

[0006] A hydraulically driven retractable puncture needle, comprising: a needle, a connecting ring, a steering control panel, a front cover, a steering gear, an inner ring, and an outer ring, characterized in that: the tail of the needle is a circular arc-shaped slider, which can be closely matched with the needle swing control tube on the steering control panel, and the needle swings by applying pressure to the hose connected to the needle swing control tube with a syringe to push the circular arc-shaped slider to slide in the tube, and the side of the needle is a cutting blade, which can smoothly cut the tissue when the needle swings, reducing resistance, and the angle of the needle tip is small, which can complete the needle insertion operation with a smaller cutting force, reducing resistance during the puncture and needle insertion process. .

[0007] Furthermore, the front cover and the steering gear sandwich the steering control disk in the middle, the slide groove on the lower surface of the front cover and the slide groove on the upper surface of the steering gear are aligned with each other, and the space reserved in the middle is the sliding track for the rotation control slider to slide, and the rotation of the needle is controlled by applying pressure to the needle rotation control tube with a syringe.

[0008] Furthermore, the steering control disc has a groove on one half of the disc and a pin on the other half, which can be inserted into the groove. Two arc-shaped pipes, namely needle swing control tubes, pass through the disc. The control tubes are connected to a hose, which is included in the interior of the needle tube formed by layers of nested needle tube inner rings and needle tube outer rings. The hose extends to the outside of the needle tube tail to connect to the syringe, and the syringe is used to control the needle swing.

[0009] Furthermore, the upper surface of the diverter is a slide groove, the hole at the end of the track is connected to the needle rotation control tube, the control tube is connected to the hose, the hose is included in the needle tube formed by multiple nesting of the needle tube inner ring and the needle tube outer ring, the hose extends to the outside of the needle tube tail to connect to the syringe, and the syringe is used to control the rotation of the needle.

[0010] Furthermore, the needle tube is connected to the piston-controlled hydraulic cylinder from the tail through a hose thicker than the steering control tube, and four control hoses in the needle tube extend from the hydraulic cylinder to the outside.

[0011] It should be noted that the connecting hose is firmly fixed and has sufficient tensile strength, so as to hold the needle in the initial puncture stage to ensure that the parts of the needle body do not move relative to each other. In addition, it should be considered that it is necessary to deal with the sudden leakage. In order to minimize the damage to the tissue, the present invention selects the hydraulic driving mode between hydraulic pressure and air pressure, and uses physiological saline as the medium.

[0012] The beneficial effects of the present invention are: The hydraulic driving method proposed in the present invention can directly apply the thrust to the needle tip instead of simply pushing the tail of the needle like a conventional flexible needle, thereby reducing error accumulation.

[0013] The elasticity of the nested retractable structure of inner and outer rings is very small. Compared with conventional flexible needles, the bending deformation is more in line with the standard arc, which can further reduce the error during the reconstruction of the needle body shape.

[0014] When the inner and outer ring nested needles are bent too much, the outer ring edges of two adjacent ones contact each other, which effectively avoids uncontrollable excessive bending of the needle body when the local resistance at the needle tip is too large. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0016] Figure 1 It is a schematic diagram of the overall structure (elongated state) of the present invention; Figure 2 It is a schematic diagram of the disassembly of parts of the present invention; Figure 3 It is a schematic diagram of a needle of the present invention; Figure 4 It is a schematic diagram of the connection ring of the present invention; Figure 5 A schematic diagram of a steering control panel of the present invention; Figure 6 It is a schematic diagram of the front cover of the present invention; Figure 7 It is a schematic diagram of a steering device of the present invention; Figure 8 It is a schematic diagram of the outer ring of the needle tube of the present invention; Fig. 9 It is a schematic diagram of the inner ring of the needle tube of the present invention; In the figure: 1, needle, 1-1, needle tip, 1-2, cutting blade, 1-3, arc-shaped slider, 2, connecting ring, 3, steering control disk, 3-1, needle swing control tube, 3-2, turntable, 3-3, rotation control slider, 3-4, pin, 3-5, groove, 4, front cover, 5, steering gear, 5-1, rotation slider track, 5-2, through hole, 5-3, needle rotation control tube, 5-4, connecting groove, 6, needle tube outer ring, 7, needle tube inner ring. DETAILED DESCRIPTION

[0017] Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, with the same meanings generally understood by those skilled in the art to which the invention belongs. However, the present invention may be implemented in various different ways, and therefore the present invention is not limited to the embodiments described herein. In addition, in order to more clearly describe and understand the present invention, some parts that are repeated multiple times and are the same will be omitted in the drawings.

[0018] It should be noted that the orientation or position indicated by terms expressing directions such as "front" and "rear" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description language, rather than indicating or implying that the structure or component referred to must have a specific orientation, operate and be constructed in a specific orientation, and therefore should not be understood as a limitation on the invention.

[0019] A hydraulically driven retractable puncture needle, the structure of which is as follows Figures 3 to 9 As shown, it comprises: a needle (1), a connecting ring (2), a steering control disk (3), a front cover (4), a steering gear (5), a needle tube outer ring (6), and a needle tube inner ring (7).

[0020] like Figure 3 As shown, during installation, the pin (3-4) of the steering control disk (3) is first pulled out from the groove (3-5) to divide the disk into two halves, the arc-shaped slider (1-3) on the needle (1) is inserted into the needle swing control tube (3-1), and then the pin is reinserted into the groove to merge. The control tube is connected to the syringe through a hose, and the syringe is pushed into the tube to pressurize the slider to slide in an arc in the tube to realize the swing of the needle.

[0021] like Figure 6 , Figure 7 As shown, the steering control disk (3) is installed between the steering gear (5) and the front cover (4), and the three are combined together by a connecting ring (2). Two arc-shaped pipes, namely the needle swing control tube (3-1), pass through the steering control disk (5), and the rotation control slider (3-3) is located in the rotation slider track (5-1). The end of the track is connected to the needle rotation control tube (5-3), and the control tube is connected to the syringe through a hose. Pushing the syringe to pressurize the tube pushes the slider to rotate in the track to drive the turntable (3-2) to rotate to realize the needle rotation.

[0022] like Figure 8 , Fig. 9 As shown, the needle body is formed by a needle tube inner ring (7) and a needle tube outer ring (6) being nested with each other. The total length of the needle can be changed by changing the number of nesting times according to actual needs. After nesting, the needle tube inner ring (7) can slide freely within the needle tube outer ring (6) to achieve telescopic needle body.

[0023] The working principle of the present invention is as follows: Initial stage of puncture: straighten the two hoses connected to the needle swing control tube (3-1) and the two hoses connected to the needle rotation control tube (5-3) to align the outer rings of the needle tubes. At this time, the needle body is in a straight and contracted state. In this tense state, the needle penetrates the tissue and is sent to a depth closer to the target point.

[0024] Puncture and needle insertion: Push the piston to apply pressure to the needle tube formed by the inner ring and the outer ring, push the inner ring (7) of the needle tube and the outer ring (6) of the needle tube to slide relative to each other to extend the needle tube, and complete the puncture and needle insertion action.

[0025] Needle swing: Pushing the syringe to pressurize the hose connected to the needle swing control tube (3-1) pushes the arc-shaped slider to slide in the needle swing control tube (3-1) in an arc shape, and the slider drives the needle to move together, thereby realizing needle swing.

[0026] Needle rotation: Pushing the syringe to apply pressure to the hose connected to the needle rotation control tube (5-3) pushes the rotation control slider (3-3) to rotate in the rotation slider track (5-1) to drive the steering control disk (3) to rotate, thereby realizing needle rotation.

[0027] Needle withdrawal: When withdrawing the needle, the pressure in the hose connected to the needle swing control tube (3-1) should be released first, so that the direction of the needle can change automatically during the withdrawal process, reducing the resistance during the withdrawal process. The needle withdrawal operation can be achieved by extracting the liquid in the needle tube, or by pulling the tail of the needle tube directly.

[0028] The above content describes and shows the basic principles, main features and advantages of the present invention. The above embodiments are not intended to limit the present invention. All descriptions are only used to illustrate the principles of the present invention. Those skilled in the art should understand that the present invention can have various improvements and changes. As long as they do not depart from the spirit and principles of the present invention, they should be included in the protection scope of the present invention. The present invention requires that the protection scope be defined by the attached claims and their equivalents.

Claims

1. A hydraulically driven retractable puncture needle, comprising: A needle (1), a connecting ring (2), a steering control disk (3), a front cover (4), a steering gear (5), an inner ring (6), and an outer ring (7), wherein the tail of the needle is a circular arc-shaped slider that can be closely matched with a needle swing control tube on the steering control disk.

2. A hydraulically driven retractable puncture needle as claimed in claim 1, characterized in that: The front cover (4) and the steering gear (5) sandwich the steering control disc (3) in the middle, the slide groove on the lower surface of the front cover (4) and the slide groove on the upper surface of the steering gear (5) are aligned with each other, and the space left in the middle is the track for the rotation control slider (3-3) to slide.

3. A hydraulically driven retractable puncture needle as claimed in claim 2, characterized in that: A groove is formed on one half of the steering control disc (3), and a pin is formed on the other half of the disc. The pin can be inserted into the groove. Two arc-shaped pipes, namely needle swing control pipes (3-1), pass through the disc. The control pipes are connected to a hose. The hose is included in the needle tube formed by the needle tube inner ring (7) and the needle tube outer ring (6) being nested layer by layer. The hose extends to the outside of the needle tube tail to connect to the syringe.

4. A hydraulically driven retractable puncture needle as claimed in claim 2, characterized in that: The upper surface of the diverter (5) is a slide groove, and the hole (5-2) at the end of the track is connected to the needle rotation control tube (5-3), and the control tube is connected to a hose. The hose is included in the needle tube formed by multiple nesting of the needle tube inner ring (7) and the needle tube outer ring (6), and the hose extends to the outside of the needle tube tail to connect to the syringe.

5. A hydraulically driven retractable puncture needle as claimed in claim 4, characterized in that: The tail end of the needle tube is connected to a piston-controlled hydraulic cylinder through a hose that is thicker than the steering control tube, and four control hoses in the needle tube extend from the hydraulic cylinder to the outside.

Images