A guide device for intracranial injection
By designing a knob and lifting block with threaded engagement to control the needle insertion depth, and using a solid needle core and curved needle to protect brain tissue, the problem of insufficient precision in controlling insertion depth and safety of existing devices has been solved, thus improving the accuracy and safety of intracranial injection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG RUICHUANG PRECISION MEDICAL TECH CO LTD
- Filing Date
- 2025-03-03
- Publication Date
- 2026-06-30
AI Technical Summary
Existing intracranial injection devices cannot precisely control the insertion depth of the injection needle, and traditional needles are sharp and can easily scratch brain tissue, posing a safety risk.
A guide device comprising a housing and a drive assembly is designed, which uses a knob and a lifting block to precisely control the needle insertion depth through a threaded engagement. It employs a solid needle core and an arc-shaped needle design to protect brain tissue, and combines a guide arm and scale measurement to improve accuracy and safety.
This allows for precise control of the needle insertion depth, reducing the risk of brain tissue damage and improving the safety and accuracy of intracranial injections.
Smart Images
Figure CN224421101U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical device technology, and more particularly to a guide device for intracranial injection. Background Technology
[0002] With the development of technology and the continuous improvement of medical standards, traditional brain treatments often involve oral medications. These medications diffuse in the body and are delivered to the brain via blood vessels, which has drawbacks such as long duration of action and weak efficacy. In recent years, a method of directly injecting drugs into the brain has become popular. However, the brain has a large number of nerves, and doctors cannot rely on experience to insert the injection needle into the accurate location, which can easily cause damage to the brain.
[0003] In practical applications, to ensure faster drug delivery to the pathological site, it is often necessary to continuously adjust the needle height and perform multiple injections to form a drug column. However, current intracranial injection guidance devices only limit the needle's offset position, but cannot precisely control the insertion depth. Furthermore, traditional injection needles have relatively sharp tips and often have a through-tube structure, posing a risk of the needle scratching brain tissue or embedding brain tissue into the needle tube. Utility Model Content
[0004] One objective of this application is to provide a guide device for intracranial injection that can overcome at least one of the deficiencies in the aforementioned background art.
[0005] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a guide device for intracranial injection, comprising a housing and a drive assembly, wherein the drive assembly is mounted on the housing, the drive assembly includes a knob and a lifting block, the knob has a through hole at its center, and the lifting block passes through the through hole; the knob and the lifting block are connected by a threaded connection; at least one slide rail is provided on the side of the lifting block, and the housing has protrusions equal in number to the slide rail inside, the protrusions being partially embedded in the slide rail, and the protrusions being used to limit the rotation of the lifting block.
[0006] Preferably, a detachable needle tube is installed at the lower part of the lifting block, a base is installed at the lower part of the housing, a protective tube is provided at the lower part of the base, and the needle tube passes through the protective tube.
[0007] Preferably, a push needle is mounted on the needle tube, and the lifting block has an internal mounting hole through which the push needle passes. The push needle has a needle handle, a limiting block, and a needle core arranged sequentially from top to bottom. A connecting block is provided at the top of the needle tube, and a through hole is provided inside the connecting block. The needle core passes through the through hole and is inserted into the needle tube. The size of the limiting block is larger than the size of the through hole, and the length of the needle handle is greater than the length of the lifting block. This configuration allows the push needle to be vertically limited downwards by the limiting block and the connecting block, ensuring that the needle core does not slip out of the needle tube.
[0008] Preferably, the needle core is solid, and its size is adapted to the inner lumen size of the needle tube, so that the needle core is sealed and installed in the needle tube. This arrangement ensures that brain tissue will not be embedded inside the needle tube when it is inserted into the brain.
[0009] Preferably, the bottom of the needle tube is chamfered, and the bottom of the needle core is curved. This design allows the chamfer and curved surface to push aside brain tissue when the needle is inserted into the brain, thereby reducing the risk of the needle damaging the brain tissue.
[0010] Preferably, the upper part of the lifting block is provided with a lug, the size of which is larger than the size of the through hole on the knob. This design ensures that the lifting block will not detach from the knob during descent.
[0011] Preferably, the upper part of the housing has an annular limiting groove, and a ball bearing is installed inside the annular limiting groove. The knob is mounted on the housing by rotating through the ball bearing.
[0012] Preferably, the knob has a positioning hole on its side, through which the ball passes into the annular limiting groove, and the diameter of the ball is greater than the depth of the annular limiting groove; a sealing block is installed inside the positioning hole to seal the ball.
[0013] Preferably, a guide arm is mounted on the outer side of the housing. The guide arm is L-shaped, and the end of the guide arm away from the housing has a scale. The surfaces of the lifting block and the knob also have scales. The movement distance of the lifting block can be accurately controlled by the scales on the lifting block, the guide arm, and the knob.
[0014] Compared with the prior art, the beneficial effects of this application are as follows:
[0015] A knob is installed on the side of the lifting block, which is connected to the lifting block by a threaded connection. By turning the knob, the movement of the lifting block can be accurately controlled, thereby controlling the movement of the needle. Doctors can accurately adjust the insertion depth of the injection needle and then inject the drug column into the brain. Both the lifting block and the guide arm are equipped with scales. The scale on the guide block can be used for precise adjustment within a small range, while the scale on the guide arm can be used for measurement within a large range, thereby increasing the measurement range and accuracy of the device.
[0016] The traditional through-hole needle is designed to be pluggable, with a solid needle core inserted into the needle tube to prevent brain tissue from entering the needle tube during puncture. In addition, the curved bottom of the needle tube and the needle core also reduces the risk of brain tissue being scratched, increasing the safety of the device. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.
[0018] Figure 2 This is a schematic diagram of the structure of the driving component in this application.
[0019] Figure 3 This is a schematic diagram of the cross-sectional structure of this application.
[0020] Figure 4 for Figure 3 A magnified schematic diagram of part A in the middle.
[0021] Figure 5 for Figure 3 A magnified view of part B in the middle.
[0022] Figure 6 This is a schematic diagram illustrating the installation of the push needle and needle tube in this application.
[0023] In the diagram: 1. Housing; 11. Annular limiting groove; 12. Groove; 100. Ball bearing; 101. Sealing block; 2. Drive assembly; 21. Knob; 22. Lifting block; 200. Protrusion; 210. Positioning hole; 220. Slide rail; 221. Ear; 3. Needle tube; 31. Connecting block; 4. Push needle; 41. Needle handle; 42. Limiting block; 43. Needle core; 5. Guide arm; 6. Base; 61. Protective tube; 62. Groove. Detailed Implementation
[0024] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.
[0025] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.
[0026] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
[0027] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.
[0028] One preferred embodiment of this application, such as Figure 1 and Figure 2 As shown, a guide device for intracranial injection includes a housing 1 and a drive assembly 2. The drive assembly 2 is installed inside the housing 1. The drive assembly 2 includes a knob 21 and a lifting block 22. A through hole is provided at the axial position of the knob 21. The lifting block 22 is installed on the knob 21 through the through hole. The knob 21 and the lifting block 22 are connected by a threaded connection.
[0029] Specifically, such as Figure 3 and Figure 4 As shown, at least one slide rail 220 is provided on the side of the lifting block 22, and the interior of the housing 1 is provided with a number of protrusions 200 equal to the number of slide rails 220. The protrusions 200 are embedded into the slide rails 220 to limit the rotation of the lifting block 22, ensuring that the knob 21 will not drive the lifting block 22 to rotate together during rotation. At the same time, under the limiting cooperation of the slide rails 220 and the protrusions 200, the lifting block 22 can only move up and down.
[0030] It should be noted that by providing mating threads on the inner side of the knob 21 and the outer side of the lifting block 22, turning the knob 21 can evenly control the lifting block 22 to rise or fall, which is more conducive to precise control of the movement of the lifting block 22; ensuring that the drugs injected multiple times are connected end to end and form a drug column. The principle of the threaded engagement is a well-known technology to those skilled in the art, so it will not be described in detail here.
[0031] Furthermore, such as Figure 3 and Figure 5 As shown, a needle tube 3 is installed at the lower part of the lifting block 22. The needle tube 3 moves synchronously with the lifting block 22. In addition, since the needle tube 3 is generally thin and the interaction area between the needle tube 3 and the lifting block 22 is small, the needle tube 3 is easily bent when it receives a lateral force.
[0032] Therefore, in some embodiments, such as Figure 3 As shown, a base 6 is installed at the lower part of the housing 1, and a protective tube 61 is provided at the lower part of the base 6. The needle tube 3 is inserted into the inside of the protective tube 61 to increase the bending resistance of the needle tube 3. In addition, the protective tube 61 can also limit the needle tube 3 to a certain extent to prevent the needle tube 3 from shaking.
[0033] It should be noted that in practical applications, doctors will select different sizes of needles according to the patient's condition. Therefore, the installation method between needle 3 and lifting block 22 can be set to detachable installation. The installation methods of needle 3 and lifting block 22 include, but are not limited to, snap-fit installation and threaded installation.
[0034] In this embodiment, as Figure 5 and Figure 6 As shown, a push needle 4 is installed on the needle tube 3. The lifting block 22 has an installation hole inside, through which the push needle 4 is inserted into the needle tube 3. The push needle 4 is provided with a needle handle 41, a limiting block 42 and a needle core 43 from top to bottom. A connecting block 31 is provided at the top of the needle tube 3. The connecting block 31 has a through hole coaxial with the needle tube 3 inside, through which the needle core 43 is inserted into the needle tube 3.
[0035] It should be noted that when the needle core 43 is inserted into the needle tube 3, the bottom of the needle core 43 should not extend to the outside of the needle tube 3. Therefore, the main function of the limiting block 42 in this application is to limit the needle core 443 in the vertical downward direction. To achieve the above purpose, the size of the limiting block 42 should be larger than the size of the through hole in the connecting block 31, so as to ensure that the limiting block 42 is always located above the connecting block 31.
[0036] It should be understood that in actual operation, the needle core 43 needs to be removed before the needle tube 3 can be used for injection. Therefore, the length of the needle handle 41 should be greater than the sum of the lengths of the lifting block 22 and the housing 1, so that the top of the needle handle 41 is always above the lifting block 22.
[0037] Furthermore, such as Figure 4 and Figure 5 As shown, the needle core 43 is a solid cylinder, and the needle tube 3 has an inner cavity. The cross-sectional dimensions of the needle core 43 should be adapted to the cross-sectional dimensions of the inner cavity of the needle tube 3 so that the needle core 43 and the needle tube 3 can be sealed together to prevent brain tissue from entering the interior of the needle tube 3.
[0038] It should be understood that the brain, as the central system of the human body, contains a large number of nerve cells. The needle of the traditional syringe is relatively sharp. If the traditional syringe is used for injection, the nerve cells in the brain tissue are easily scratched, which will have a greater impact on the patient.
[0039] Therefore, in this embodiment, as Figure 1 As shown, the bottom of the needle tube 3 is set with a chamfer. When the smooth needle is inserted into the brain tissue, it will push the nerve cells apart, thereby avoiding the nerve cells being scratched by the needle. Correspondingly, the bottom of the needle core 43 is also set with a smooth arc shape, so as to cooperate with the needle tube 3 to protect the integrity of the nerve cells in the brain tissue to the greatest extent.
[0040] In this embodiment, as Figure 3 and Figure 4 As shown, the upper part of the housing 1 is provided with an annular limiting groove 11, and a ball bearing 100 is installed inside the annular limiting groove 11. The annular limiting groove 11 is used to limit the ball bearing 100 in the vertical direction; the knob 21 is mounted on the housing by rotating the ball bearing 100.
[0041] It should be understood that, according to mechanical principles, the ball bearing 100 cannot be directly installed between the annular limiting groove 11 and the knob 21. Therefore, in this application, a positioning hole 210 is provided on the side of the knob 21. The positioning hole 210 is aligned with the annular limiting groove 11 so that the ball bearing 100 can directly reach the annular limiting groove 11 through the positioning hole 210.
[0042] Understandably, in order to prevent the ball 100 from sliding out of the positioning hole 210, a sealing block 101 is installed inside the positioning hole 210. The sealing block 101 is used to block the ball 100. In addition, the ball 100 can also limit the knob 21 in the vertical direction to prevent the knob 21 from falling off the housing 1.
[0043] Specifically, such as Figure 3 As shown, the bottom of the housing 1 is provided with a slot 12, through which the needle tube 3 extends to the outside of the housing 1; at the same time, a groove 62 is provided on the upper part of the base 6, which is used to limit the needle tube 3 vertically downward. The connection between the housing 1 and the base 6 includes, but is not limited to, threaded fit and interference fit.
[0044] In this embodiment, as Figure 1 As shown, a guide arm 5 is installed on the outside of the housing 1. The guide arm 5 is "L" shaped. The end of the guide arm 5 away from the housing 1 has a scale. The surfaces of the lifting block 22 and the knob 21 also have scales.
[0045] Understandably, scales are provided on the surfaces of the guide arm 5, knob 21, and lifting block 22 to further ensure the accuracy and intuitiveness of the measurement. To increase the measurement range and accuracy of this device, the scale on the guide arm 5 is for a large range, and the scale on the lifting block 22 is for a small range; the scales on the knob 21 and the lifting block 22 can be set according to a certain conversion ratio, and the specific conversion ratio can be adjusted by setting different thread fits.
[0046] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.
Claims
1. A guide device for intracranial injection, characterized in that, The device includes a housing (1) and a drive assembly (2), the drive assembly (2) being mounted on the housing (1); the drive assembly (2) includes a knob (21) and a lifting block (22), the knob (21) having a through hole at its center, the lifting block (22) passing through the through hole; the knob (21) and the lifting block (22) being connected by a threaded connection; the side of the lifting block (22) is provided with at least one slide rail (220), and the interior of the housing (1) is provided with a number of protrusions (200) equal to the number of slide rails (220), the protrusions (200) being partially embedded in the slide rails (220).
2. The guide for intracranial injection of claim 1, wherein, A detachable needle tube (3) is installed at the lower part of the lifting block (22), a base (6) is installed at the lower part of the housing (1), a protective tube (61) is provided at the lower part of the base (6), and the needle tube (3) passes through the protective tube (61).
3. The guide for intracranial injection of claim 2, wherein, A push needle (4) is installed on the needle tube (3). The inside of the lifting block (22) is provided with an installation hole, through which the push needle (4) passes. The push needle (4) is provided with a needle handle (41), a limiting block (42) and a needle core (43) from top to bottom. A connecting block (31) is provided at the top of the needle tube (3). A through hole is provided inside the connecting block (31). The needle core (43) passes through the through hole and is inserted into the needle tube (3). The size of the limiting block (42) is larger than the size of the through hole. The length of the needle handle (41) is greater than the sum of the lengths of the lifting block (22) and the shell.
4. The guide for intracranial injection of claim 3, wherein, The needle core (43) is solid, and the size of the needle core (43) is adapted to the inner cavity size of the needle tube (3) so that the needle core (43) is sealed and installed in the needle tube (3).
5. The guiding device for intracranial injection as described in claim 4, characterized in that, The bottom of the needle tube (3) is chamfered, and the bottom of the needle core (43) is curved.
6. The guiding device for intracranial injection as described in claim 1, characterized in that, The upper part of the lifting block (22) is provided with a lug (221), the size of which is larger than the size of the through hole on the knob (21).
7. The guiding device for intracranial injection as described in claim 6, characterized in that, The upper part of the housing (1) has an annular limiting groove (11), and a ball bearing (100) is installed inside the annular limiting groove (11). The knob (21) is mounted on the housing (1) by rotating through the ball bearing (100).
8. The guide device for intracranial injection as described in claim 7, characterized in that, The knob (21) has a positioning hole (210) on its side. The ball (100) passes through the positioning hole (210) and enters the annular limiting groove (11). The diameter of the ball (100) is greater than the depth of the annular limiting groove (11). A sealing block (101) is installed inside the positioning hole (210). The sealing block (101) is used to seal the ball (100).
9. The guiding device for intracranial injection as described in claim 1, characterized in that, A guide arm (5) is installed on the outside of the housing (1). The guide arm (5) is "L" shaped and has a scale on one end away from the housing (1). The surfaces of the lifting block (22) and the knob (21) are also marked.