Clinical sampling device for pediatric oncology surgery
Through the design of the inner core needle and outer sleeve combination, and the use of an expandable sampling needle and stress relief hole, the problems of damage and insufficient sampling of traditional sampling devices in children's body cavities are solved, and safe and efficient sampling operations are achieved.
Patent Information
- Application Number
- CN202511050087.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2025-09-12
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Existing pediatric tumor surgical sampling devices are prone to tissue tearing, bleeding, and accidental injury to adjacent organs due to the narrow body cavity and delicate organ tissues of children. The fine needle sampling volume is insufficient, and the existing expandable needles lack sealing or rely on complex transmission mechanisms, making them difficult to adapt to the anatomical gaps of children.
It adopts a combination of inner core needle and outer sleeve. The inner core needle consists of an expandable sampling needle and a needle handle. The pointed wing is made of memory alloy. The expansion of the wing is controlled by unfolding the pull wire. Combined with the transverse and longitudinal stress relief holes, the stability and safety of the sampling space are ensured.
It reduces damage to children's tissues, improves the success rate and accuracy of sampling, avoids tissue residue and omission, adapts to the narrow body cavity of children, and reduces the risk of complications.
Smart Images
Figure CN120616628A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of living tissue sampling instruments, in particular to a sampling device for clinical use in pediatric tumor surgery. Background Art
[0002] During clinical sampling in pediatric tumor surgery, traditional puncture needles have significant defects due to the small body cavity, delicate organ tissues and large displacement of children: on the one hand, a thicker needle diameter (such as 18G and above) is often required to obtain sufficient samples, which can easily lead to tissue tearing, bleeding and accidental injury to adjacent organs; on the other hand, although fine needles (such as 22G and below) cause less damage, the sampling volume is insufficient and false negatives are prone to occur.
[0003] Existing expandable needles mostly rely on mechanical expansion structures, which lack closure after expansion and can easily lead to tissue residue or leakage; although umbrella-shaped needles can expand the sampling range, they rely on complex transmission mechanisms and increase the needle diameter, making them difficult to adapt to the narrow anatomical spaces of children.
[0004] Therefore, there is an urgent need for a new clinical sampling device for pediatric tumor surgery that can achieve reliable puncture sampling on a small-sized puncture needle. Summary of the Invention
[0005] The object of the present invention is to provide a sampling device for clinical use in pediatric tumor surgery to solve the problems raised in the above-mentioned background technology.
[0006] To achieve the above object, the present invention provides the following technical solutions:
[0007] A clinical sampling device for pediatric tumor surgery comprises an outer sleeve and an inner core needle: the inner core needle comprises an inner core needle tube, the head and tail of the inner core needle tube are an expandable sampling needle and a needle handle respectively, and the tail of the inner core needle tube is also connected to a negative pressure tube; the expandable sampling needle has at least three pointed winglets, which are distributed in a circular array at the head of the inner core needle tube, with the tips of the pointed winglets slightly spread outward, and an expansion pull wire is connected to the outer wall of the tip of the pointed winglet, which extends along the inner core needle tube to the needle handle; the pointed winglets and the inner core needle tube are cut from a memory alloy tube, and the bases of adjacent pointed winglets are separated by cutting grooves, and at least one wedge-shaped groove is provided on both sides of the base of the pointed winglet.
[0008] Furthermore, a transverse stress relief hole is provided at the root of the wedge-shaped groove.
[0009] Furthermore, a longitudinal stress relief hole is provided at the root of the groove at the base of the pointed wing.
[0010] Furthermore, the gap areas between adjacent pointed fins are connected by a membrane, and the membrane covers the cut groove and the wedge-shaped groove.
[0011] Furthermore, the tip of the pointed wing is provided with a cutting edge.
[0012] Furthermore, the needle handle includes a handle seat, a slide is provided on the side of the handle seat facing the inner core needle tube, a sliding sleeve is slidably connected to the slide, a limit platform is provided on the end of the slide away from the handle seat, a wire hole is provided on the limit platform, and the unfolding pull wire passes through the wire hole at the end away from the pointed wing and is connected to the sliding sleeve.
[0013] Furthermore, a spring is provided on the slide, and two ends of the spring respectively abut against the slide and the handle seat.
[0014] Furthermore, the head and tail of the inner core needle tube are respectively provided with entry holes and exit holes equal in number to the deployment pull wire. The deployment pull wire passes through the inner wire groove of the inner core needle tube from the entry hole, and passes through the inner wire groove from the exit hole.
[0015] Furthermore, the pointed wing and the inner core needle tube are made of Nitinol alloy.
[0016] Compared with the prior art, the present invention has the following beneficial effects:
[0017] 1. This invention establishes a stable channel for the inner core needle by pre-inserting the outer cannula, avoiding repeated stimulation and damage to children's delicate tissues caused by direct puncture, and reducing the incidence of complications such as hematoma and pain after surgery. The expandable sampling needle can expand the sampling space according to the size of the lesion. While meeting the sample volume, a thinner puncture needle can adapt to the narrow body cavity and large organ displacement of children, while avoiding the defects of adult puncture needles that are prone to damage and accidental injury to adjacent tissues.
[0018] 2. In the present invention, the transverse stress relief holes and the longitudinal stress relief holes effectively prevent problems such as material fatigue and fracture caused by stress concentration, which not only reduces the risk of needle damage during the sampling process, but also ensures the smoothness of the expansion and contraction of the pointed wing, making the sampling operation more accurate and stable, and improving the sampling success rate.
[0019] 3. In this invention, to deploy the expandable sampling needle, the operator presses on the sliding sleeve. The movement of the sliding sleeve simultaneously pulls all the deployment wires, which in turn causes the pointed wings to expand outward synchronously. When the sliding sleeve is released, the spring pushes the sliding sleeve back into place, releasing the tension in the wires, and the pointed wings return to their retracted state due to their own characteristics. This makes the deployment and retraction of the expandable sampling needle smoother and simpler.
[0020] 4. In the present invention, the deployment pull wire is passed through the internal wire groove of the inner core needle tube, which can avoid the deployment pull wire being hit during the process of unpacking or inserting the outer sleeve, thereby improving the reliability of use. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1 This is a schematic diagram of the structure of a sampling device used in clinical pediatric tumor surgery;
[0022] Figure 2 This is a schematic diagram of the structural breakdown of a sampling device used in clinical pediatric oncology surgery;
[0023] Figure 3 Schematic diagram of the structure of the inner core needle tube;
[0024] Figure 4 A schematic diagram of the structure of an expandable sampling needle;
[0025] Figure 5 Axial schematic diagram of the expandable sampling needle with only one pointed fin remaining;
[0026] Figure 6 A top view of the expandable sampling needle with only one pointed fin remaining;
[0027] Figure 7 Schematic diagram of the structure of the needle handle;
[0028] Figure 8 Schematic diagram of the structural decomposition of the needle handle.
[0029] In the figure: 1. Inner core needle; 2. Inner core needle tube; 3. Expandable sampling needle; 4. Needle handle; 5. Negative pressure tube; 6. Outer sleeve; 301. Pointed wing; 302. Diaphragm; 303. Deployment pull wire; 304. Longitudinal stress relief hole; 305. Wedge-shaped groove; 306. Transverse stress relief hole; 307. Entry hole; 308. Exit hole; 401. Handle seat; 402. Sliding sleeve; 403. Sliding platform; 404. Limiting platform; 405. Wire hole; 406. Spring. DETAILED DESCRIPTION
[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0031] Example 1: A clinical sampling device for pediatric tumor surgery, comprising an outer sleeve 6 and an inner core needle 1: the inner core needle 1 comprises an inner core needle tube 2, the head and tail of the inner core needle tube 2 are respectively an expandable sampling needle 3 and a needle handle 4, and the tail of the inner core needle tube 2 is also connected to a negative pressure tube 5; the expandable sampling needle 3 has at least three pointed winglets 301, and the pointed winglets 301 are distributed in a circular array at the head of the inner core needle tube 2, and the tips of the pointed winglets 301 are slightly opened outward, and an expansion pull wire 303 is connected to the outer wall of the tip of the pointed winglet 301, and the expansion pull wire 303 extends along the inner core needle tube 2 to the needle handle 4; the pointed winglets 301 and the inner core needle tube 2 are made by cutting from a memory alloy tube, and the bases of adjacent pointed winglets 301 are separated by cutting grooves, and there is one or more wedge-shaped grooves 305 on both sides of the base of the pointed winglet 301.
[0032] The gap areas between adjacent pointed fins 301 are connected by a membrane 302 , and the membrane 302 covers the cutouts and wedge-shaped grooves 305 .
[0033] The tip of the pointed wing 301 is provided with a cutting edge.
[0034] The pointed wing 301 and the inner core needle tube 2 are made of Nitinol alloy.
[0035] Working principle of this embodiment:
[0036] like Figure 1 and Figure 2 As shown, this embodiment is mainly composed of an outer sleeve 6 and an inner core needle 1, wherein the inner core needle 1 further includes an inner core needle tube 2, an expandable sampling needle 3, a needle handle 4 and a negative pressure tube 5.
[0037] Before the sampling operation begins, the outer sleeve 6 is first inserted into the child's body to a predetermined sampling depth. The outer sleeve 6 plays a role in guiding and establishing a sampling channel. Since the outer sleeve 6 is inserted first, a stable path is provided for the subsequent insertion of the inner core needle 1. In order to reduce physical damage to the child, the inner core needle 1 should be a fine needle puncture of 22G or less. The inner core needle 1 is inserted along the inside of the outer sleeve 6 that has been inserted. In this process, the outer wall of the inner core needle 1 fits tightly with the inner wall of the outer sleeve 6 but can slide smoothly, ensuring that the inner core needle 1 can accurately advance along the channel established by the outer sleeve 6 until the expandable sampling needle 3 reaches the tube mouth position of the outer sleeve 6.
[0038] like Figure 3 、 Figure 4 、 Figure 5 As shown, when the expandable sampling needle 3 extends from the outer tube 6, the expandable sampling needle 3 is in a retracted state. Figure 7 and Figure 8 As shown, by operating the needle handle 4, pulling the expansion line 303, the pointed wing 301 is driven to expand outward. Figure 4As shown, the pointed fins 301 are distributed in a circular array at the head of the inner core needle tube 2, and the bases of adjacent pointed fins 301 are separated by grooves. There is one or more wedge-shaped grooves 305 on both sides of the base of the pointed fins 301, so that the pointed fins 301 can be smoothly unfolded in the designed direction to form a relatively large sampling space. Figure 6 As shown, the gap areas between adjacent pointed fins 301 are connected by diaphragms 302, which cover the cutouts and wedge-shaped grooves 305. During the expansion process, the diaphragms 302 are also expanded, which can not only ensure the integrity and sealing of the sampling space, but also prevent tumor tissue from leaking out of the gaps. After the pointed fins 301 are expanded to form a sampling space, the negative pressure device connected to the negative pressure tube 5 is opened (not shown). The negative pressure tube 5 is connected to the tail of the inner core needle tube 2. The negative pressure is transmitted to the expandable sampling needle 3 through the inner core needle tube 2, and the tumor tissue is sucked into the space surrounded by the expanded pointed fins 301 to complete the sampling operation. The tip of the pointed fin 301 is provided with a cutting edge. Rotating the inner core needle 1 can play a role in cutting and separating, and can achieve effective sampling in positions where all tissues are difficult to separate, but cannot be used in sensitive sampling areas. After the sampling is completed, the negative pressure device is turned off first, and then the pull wire 303 is relaxed by operating the needle handle 4. Due to the memory property of the Nitinol alloy, the pointed wing 301 will return to its initial contracted state, wrapping the collected tumor tissue inside the inner core needle 1. After that, the inner core needle 1 is slowly withdrawn along the outer sleeve 6, and then the outer sleeve 6 is also withdrawn from the child's body, completing the entire sampling process.
[0039] This embodiment uses the outer cannula to establish a stable channel for the inner core needle in advance, avoiding repeated irritation and damage to children's delicate tissues caused by direct puncture, thereby reducing the incidence of postoperative complications such as hematoma and pain. The expandable sampling needle can expand the sampling space according to the size of the lesion. While meeting the sample volume, a thinner puncture needle can adapt to the narrow body cavity and large organ displacement of children, while avoiding the drawbacks of adult puncture needles that are prone to damage and accidental injury to adjacent tissues.
[0040] Example 2: A sampling device for clinical pediatric tumor surgery. The difference from Example 1 is that a transverse stress relief hole 306 is provided at the root of the wedge-shaped groove 305 .
[0041] A longitudinal stress relief hole 304 is provided at the root of the groove at the base of the pointed wing 301 .
[0042] Working principle of this embodiment:
[0043] like Figure 5 and Figure 6As shown, during the expansion and contraction of the expandable sampling needle 3, as the pointed fins 301 expand outward, stress concentration occurs at their bases and at the junctions of adjacent fins. The transverse stress relief holes 306 disperse the transverse stress at the base of the wedge-shaped groove 305, while the longitudinal stress relief holes 304 relieve the longitudinal stress at the base of the groove.
[0044] The transverse stress release holes 306 and the longitudinal stress release holes 304 effectively prevent problems such as material fatigue and fracture caused by stress concentration, which not only reduces the risk of needle damage during the sampling process, but also ensures the smooth expansion and contraction of the pointed wing 301, making the sampling operation more accurate and stable, and improving the sampling success rate.
[0045] Example 3: A sampling device for clinical pediatric tumor surgery. The difference from Example 1 is that the needle handle 4 includes a handle base 401, and a slide 403 is provided on the side of the handle base 401 facing the inner core needle tube 2. A sliding sleeve 402 is slidably connected to the slide 403. A limit platform 404 is provided on the end of the slide 403 away from the handle base 401, and a wire hole 405 is provided on the limit platform 404. The end of the unfolding pull wire 303 away from the pointed wing 301 passes through the wire hole 405 and is connected to the sliding sleeve 402.
[0046] A spring 406 is sleeved on the slide 403 , and two ends of the spring 406 respectively press against the slide sleeve 402 and the handle base 401 .
[0047] Working principle of this embodiment:
[0048] like Figure 7 and Figure 8 As shown, to deploy the expandable sampling needle 3, the operator presses on the sliding sleeve 402. The movement of the sliding sleeve 402 simultaneously pulls all the deployment wires 303, which in turn causes the pointed fins 301 to expand outward synchronously. When the sliding sleeve 402 is released, the spring 406 pushes the sliding sleeve 402 back into place, releasing the tension on the wires 303, and the pointed fins 301 return to their retracted state due to their inherent properties. This embodiment makes the deployment and retraction of the expandable sampling needle 3 smoother and simpler.
[0049] Example 4: A sampling device for clinical pediatric tumor surgery. The difference from Example 1 is that the head and tail of the inner core needle tube 2 are respectively provided with entry holes 307 and exit holes 308, which are equal in number to the deployment pull wire 303. The deployment pull wire 303 passes through the internal wire groove of the inner core needle tube 2 from the entry hole 307, and passes through the internal wire groove from the exit hole 308.
[0050] In this embodiment, the deployment pull wire 303 is passed through the internal wire groove of the inner core needle tube 2, which can prevent the deployment pull wire 303 from being hit during the process of unpacking or inserting the outer sleeve 6, thereby improving the reliability of use.
Claims
1. A sampling device for clinical pediatric tumor surgery, characterized in that: It includes an outer sleeve (6) and an inner core needle (1): The inner core needle (1) comprises an inner core needle tube (2), the head and tail of the inner core needle tube (2) are respectively an expandable sampling needle (3) and a needle handle (4), and the tail of the inner core needle tube (2) is also connected to a negative pressure tube (5); The expandable sampling needle (3) has at least three pointed fins (301), which are distributed in a circular array at the head of the inner core needle tube (2), with the tips of the pointed fins (301) slightly open outwards. An expansion pull line (303) is connected to the outer wall of the tip of the pointed fin (301), and the expansion pull line (303) extends along the inner core needle tube (2) to the needle handle (4); The pointed wing (301) and the inner core needle tube (2) are cut from a memory alloy tube. The bases of adjacent pointed wing (301) are separated by grooves. Both sides of the base of the pointed wing (301) are provided with one or more wedge-shaped grooves (305).
2. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: A transverse stress release hole (306) is provided at the root of the wedge-shaped groove (305).
3. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: A longitudinal stress release hole (304) is provided at the root of the groove at the base of the pointed wing (301).
4. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: The gap areas between adjacent pointed fins (301) are connected by a membrane (302), and the membrane (302) covers the cut groove and the wedge-shaped groove (305).
5. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: The tip of the pointed wing (301) is provided with a cutting edge.
6. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: The needle handle (4) includes a handle base (401), a slide (403) is provided on the side of the handle base (401) facing the inner core needle tube (2), a slide sleeve (402) is slidably connected to the slide (403), a limit platform (404) is provided on the end of the slide (403) away from the handle base (401), a wire hole (405) is provided on the limit platform (404), and the end of the unfolding pull wire (303) away from the pointed wing (301) passes through the wire hole (405) and is connected to the slide sleeve (402).
7. The sampling device for clinical pediatric tumor surgery according to claim 6, characterized in that: The slide (403) is sleeved with a spring (406), and two ends of the spring (406) respectively press against the slide sleeve (402) and the handle seat (401).
8. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: The head and tail of the inner core needle tube (2) are respectively provided with entry holes (307) and exit holes (308) equal in number to the number of the deployment pull wires (303); the deployment pull wires (303) are passed through the entry holes (307) into the internal wire groove of the inner core needle tube (2); and the deployment pull wires (303) are passed through the internal wire groove from the exit holes (308).
9. The sampling device for clinical pediatric tumor surgery according to claim 1, characterized in that: The pointed wing piece (301) and the inner core needle tube (2) are made of Nitinol alloy.