Die body for venipuncture and vein depth adjusting method
By setting a stroke groove and drive assembly inside the phantom, and using a linear motor to adjust the depth of the vein simulation tube, the problem of poor adaptability of existing training models is solved, enabling simulation of different patients and physiological states, and improving training effectiveness.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- PEOPLES HOSPITAL OF DEYANG CITY
- Filing Date
- 2026-04-21
- Publication Date
- 2026-05-19
AI Technical Summary
Existing venipuncture training models cannot adapt to the different body types and physiological and pathological conditions of patients, resulting in limited training scenarios, inability to simulate complex vascular conditions, and affecting training effectiveness.
A travel groove is set inside the phantom, and a drive assembly (including a linear motor) is used to make the vein simulation tube slide in the travel groove. The depth of the vein simulation tube is adjusted by translation or rotation to ensure that the vascular conditions of different patients or different physiological and pathological states are simulated.
The depth of the vein simulation tube relative to the outer surface of the phantom was dynamically adjusted, which improved the adaptability and realism of the training and enhanced the training effect.
Smart Images
Figure CN122067459A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of training models, and in particular to a phantom for venipuncture and a method for adjusting vein depth. Background Technology
[0002] Vein puncture is a mandatory skill for every medical worker, and training usually requires a venipuncture training model.
[0003] Current puncture training models typically have a vein simulation tube that simulates a vein, and the position of the vein simulation tube is usually fixed. For example, the highly realistic arteriovenous puncture training arm disclosed in Chinese Patent Publication No. CN117672064A shows that the technical solution disclosed in this document reflects that the vein simulation tube in most puncture training models in this industry is fixed, that is, the distance between the vein simulation tube and the skin surface is constant. At the same time, it also discloses the industry's judgment criterion of whether the puncture was successful, which is to use whether there is blood return from the puncture needle.
[0004] However, in reality, due to the different body types of patients, the distance between the veins and the skin surface varies. Furthermore, if a patient has edema, the veins are located deeper than when there is no edema; conversely, in cases of dehydration, the veins are located shallower than when there is no edema. Consequently, the fixed vein simulation tubes in the venipuncture training model can only meet basic training needs and cannot meet more advanced training requirements. In other words, the current puncture training model cannot reproduce the complex vascular conditions in clinical practice, has limited training scenarios, poor adaptability, and is difficult to simulate vascular conditions in different patients (such as obese, dehydrated, or emaciated) or under different physiological and pathological conditions. Although Chinese Patent CN215450618U discloses an arm vein puncture training device addressing the technical problem of adjusting the position of a simulated vein tube, this device changes the distance between the simulated vein tube mounted on the outer wall of the inflatable cavity and the skin surface by inflating the cavity with gas, thus simulating different vascular conditions. However, changing the volume of the inflatable cavity causes varying degrees of compression on the skin and subcutaneous soft tissue. This results in changes in the density of the material used to simulate the subcutaneous soft tissue, affecting the trainee's puncture feel and training effectiveness. Furthermore, the materials used to simulate skin and subcutaneous soft tissue are typically deformable. Changes in the volume of the inflatable cavity also cause corresponding deformations in these materials; an increase in the volume of the inflatable cavity leads to an increase in the outer diameter of the arm model, making it difficult to control the depth and position of the simulated vein tube. Chinese patent CN117672064A proposes a highly realistic arteriovenous puncture training arm for adjusting the depth of the venous simulation tube. This solution simply uses multiple venous simulation tubes distributed at different depths to achieve training for venous simulation tube puncture at different depths, which has poor adaptability. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned problems by providing a phantom for venous puncture and a method for adjusting the depth of the vein, which can dynamically adjust the depth of the simulated vein tube relative to the outer surface of the phantom, and can adapt to vascular conditions in different patients or under different physiological and pathological conditions.
[0006] The technical solution adopted in this invention is as follows: a phantom for venipuncture, wherein a travel groove is provided inside the phantom; a vein simulation tube is provided in the travel groove, and a drive assembly for driving the vein simulation tube to slide in the travel groove; the direction in which the vein simulation tube slides in the travel groove has an angle with the radial direction of the phantom.
[0007] Furthermore, the depth of the travel groove is less than half the outer diameter of the vein simulation tube.
[0008] Furthermore, the drive assembly includes at least two linear motors, multiple linear motors are distributed along the vein simulation tube, and at least one linear motor is present at each end of the vein simulation tube; the fixed end of the linear motor is connected to the groove wall of the stroke groove, and the movable end of the linear motor is connected to the outer wall of the vein simulation tube.
[0009] Furthermore, one of the linear motors located at both ends of the vein simulation tube is hinged to the vein simulation tube, while the remaining linear motors are slidably connected to the vein simulation tube.
[0010] Furthermore, the output end of the linear motor is hinged with a connecting ring, through which the vein simulation tube passes; the connecting ring on the linear motor that is slidably connected to the vein simulation tube is slidably connected to the vein simulation tube, and the connecting ring on the linear motor that is only hinged to the vein simulation tube is fixedly connected to the vein simulation tube.
[0011] Furthermore, an elastic damping pad is provided between the connecting ring and the vein simulation tube; the frictional force between the elastic damping pad and the vein simulation tube is greater than the frictional force between the vein simulation tube and the model.
[0012] Furthermore, the linear motors located at both ends of the vein simulation tube are fixedly connected to the vein simulation tube.
[0013] Furthermore, an artery simulation tube is also provided inside the phantom.
[0014] Furthermore, the phantom includes a skin simulation layer, a skeleton simulation component, and a tissue simulation layer located between the skin simulation layer and the skeleton simulation component, with the travel groove formed in the tissue simulation layer.
[0015] A method for adjusting vein depth, applied to the phantom for vein puncture, performing step S1 or step S2; S1: Translation; All linear motors work synchronously, driving the vein simulation tube to move as a whole within the travel groove, thus changing the overall depth of the vein simulation tube. S2: Rotational movement; The linear motor hinged to the vein simulation tube is not working, while the other linear motors are working. The other linear motors move the vein simulation tube, causing it to rotate. At the same time, the vein simulation tube slides relative to the other linear motors, thus driving the vein simulation tube to move locally within the travel groove, changing the local depth of the vein simulation tube.
[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: This invention provides a travel groove inside the phantom body, and the direction in which the vein simulation tube moves within the travel groove is not along the radial direction of the phantom body. This ensures that the depth of the vein simulation tube relative to the outer surface of the phantom body changes when the vein simulation tube moves, while ensuring that there is always a tissue simulation layer above the vein simulation tube. This allows the invention to adapt to the vascular conditions of different patients or different physiological and pathological states. Attached Figure Description
[0017] The present invention will be described by way of example and with reference to the accompanying drawings, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional schematic diagram of the mold; Figure 3 This is a schematic diagram showing the connection between the vein simulation tube and the linear motor; The markings in the diagram are: 1-Phantom; 11-Skin simulation layer; 12-Tissue simulation layer; 13-Skeleton simulation component; 14-Stroke groove; 2-Vein simulation tube; 3-Linear motor; 31-Damping pad; 32-Connecting ring; 4-Artery simulation tube. Detailed Implementation
[0018] In the description of this specification, it should also be noted that, unless otherwise expressly specified and limited, the terms “setup,” “installation,” and “connection” should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components.
[0019] Example 1 like Figures 1-3 As shown, a phantom for venipuncture is provided. The phantom 1 has a travel groove 14 inside. A vein simulation tube 2 is located within the travel groove 14, along with a drive assembly that drives the vein simulation tube 2 to slide within the travel groove 14. The direction in which the vein simulation tube 2 slides within the travel groove 14 forms an angle with the radial direction of the phantom 1. In use, the liquid inlet of the vein simulation tube 2 can be connected to the outlet of a storage tank via a pump, and the outlet of the vein simulation tube 2 is connected to the return port of the storage tank. The storage tank contains liquid simulating blood, thus providing the vein simulation tube 2 with the liquid simulating blood.
[0020] In this embodiment, a travel groove 14 is provided to provide a movable space for the vein simulation tube 2; specifically, the travel groove 14 has three dimensions: depth, length, and width; wherein: The depth is the size that accommodates the vein simulation tube 2. Preferably, the depth does not exceed half of the outer diameter of the vein simulation tube 2, so that the trainee can feel the position of the vein simulation tube 2 by touching the phantom 1, so as to match the actual method of finding veins by touch; the length is the size that accommodates the axial length of the vein simulation tube 2, that is, the two ends of the vein simulation tube 2 passing through the travel groove 14 in the length direction; the width is the direction of movement of the vein simulation tube 2.
[0021] Furthermore, the design requirement of the travel groove 14 is that "the direction in which the vein simulation tube 2 slides within the travel groove 14 forms an angle with the radial direction of the mold body 1". In reality, the width direction of the travel groove 14 forms an angle with the radial direction of the mold body 1. The radial direction of the mold body 1 is actually considered as a cylinder with a circular cross-section. The radial direction refers to the radius or diameter direction from the center of the circle to the circumference. This design allows the vein simulation tube 2 to have a change in depth during movement, while also preventing the absence of a tissue simulation layer 12 covering the vein simulation tube 2 due to changes in its position.
[0022] In this embodiment, for the vein simulation tube 2, a thin-walled elastic silicone tube with a Shore A hardness of approximately 5-10 and a wall thickness of 0.5-1.0 mm can be selected to simulate the low-pressure and collapsible characteristics of a vein. At the same time, after being punctured by a puncture needle, the needle hole of this thin-walled elastic silicone tube can automatically close, effectively preventing liquid leakage and withstanding multiple repeated punctures. This characteristic is well known to those skilled in the art, and will not be described in detail in this specification.
[0023] In this embodiment, based on the principle of reducing material waste, the vein simulation tube 2 can be detachably connected to the drive assembly, such as by a buckle or clamp, so that the vein simulation tube 2 can be directly replaced.
[0024] In summary, by setting a travel groove 14 inside the phantom 1, and ensuring that the direction of movement of the vein simulation tube 2 within the travel groove 14 is not along the radial direction of the phantom 1, the depth of the vein simulation tube 2 relative to the outer surface of the phantom 1 is changed when the vein simulation tube 2 moves, while ensuring that there is always a tissue simulation layer 12 above the vein simulation tube 2, so as to adapt to the vascular conditions of different patients or different physiological and pathological states.
[0025] Example 2 Based on Example 1, further feasible implementation methods are proposed.
[0026] In one feasible implementation, the depth of the travel groove 14 is less than half the outer diameter of the vein simulation tube 2, ensuring that the trainee can feel the position of the vein simulation tube 2 by touching the phantom 1, so as to match the actual method of finding veins by touch.
[0027] In one feasible implementation, the drive assembly includes at least two linear motors 3, and multiple linear motors 3 are distributed along the vein simulation tube 2, with at least one linear motor 3 at each end of the vein simulation tube 2; the fixed end of the linear motor 3 is connected to the groove wall of the stroke groove 14, and the movable end of the linear motor 3 is connected to the outer wall of the vein simulation tube 2.
[0028] Furthermore, there are a number of linear motors 3, located at both ends of the vein simulation tube 2. By activating one or more of the linear motors 3, the vein simulation tube 2 is moved, thereby changing its position within the travel groove 14 and thus altering its depth relative to the surface of the phantom 1. Furthermore, by controlling any one of the linear motors 3 located at both ends of the vein simulation tube 2 to be deactivated while the others are activated, the angle of the vein simulation tube 2 relative to the travel groove 14 in the length direction can be adjusted, enabling the simulation of scenes with different depth dimensions (different depths of the vein simulation tube 2 relative to the surface of the phantom 1).
[0029] Based on the above description, the vein simulation tube 2 can be implemented in two ways in this embodiment: one is a synchronous translation; the other is that one end is fixed while the other end moves, thereby causing the vein simulation tube 2 to rotate as a whole. Therefore, based on these two types of movement, the following connection methods can be adapted: In the first embodiment of synchronous translation of the vein simulation tube 2, the linear motors 3 at both ends of the vein simulation tube 2 are fixedly connected to the vein simulation tube 2; that is, a connecting ring 32 can be directly fixed at the output end of the linear motor 3, and the connecting ring 32 is fixedly connected to the vein simulation tube 2, so as to realize the fixed connection between the linear motor 3 and the static simulation ring; however, this connection method requires synchronous operation when moving the vein simulation tube 2 to avoid motion interference; based on this, this connection method can only realize the movement of the vein simulation tube 2 along the width direction of the stroke groove 14.
[0030] In the second embodiment of the overall rotational movement of the vein simulation tube 2, any one of the linear motors 3 at both ends of the vein simulation tube 2 is hinged to the vein simulation tube 2, while the other linear motors 3 are slidably connected to the vein simulation tube 2. Specifically, a connecting ring 32 is hinged to the output end of the linear motor 3, through which the vein simulation tube 2 passes. The connecting ring 32 on the linear motor 3 slidably connected to the vein simulation tube 2 is slidably connected to the vein simulation tube 2, while the connecting ring 32 on the linear motor 3 that is only hinged to the vein simulation tube 2 is fixedly connected to the vein simulation tube 2. The hinge can adapt to changes in angle, and the sliding connection can adapt to changes in the axial length of the vein simulation tube 2 within the stroke groove 14, effectively avoiding motion interference. Considering the resistance generated by the tissue simulation layer 12 in the phantom 1 on the movement of the vein simulation tube 2, an elastic damping pad 31 (such as a rubber pad) can be set between the connecting ring 32 and the vein simulation tube 2 to increase the friction between the vein simulation tube 2 and the connecting ring 32 (this friction is greater than the friction between the vein simulation tube 2 and the tissue simulation layer 12), ensuring that the movement of the vein simulation tube 2 can proceed smoothly.
[0031] Furthermore, since the space of the stroke slot 14 is small, and under the condition that the vein simulation tube 2 needs to be moved in full size within the stroke slot 14 as much as possible, the linear motor 3 can be selected as a multi-stage stroke motor.
[0032] In one feasible implementation, the phantom 1 is further provided with an arterial simulation tube 4 for simulating arterial puncture training. Of course, the key feature of this phantom 1 is that the position of the venous simulation tube 2 can be adjusted to adapt to different patients or different physiological and pathological conditions of the venous vessels. Therefore, the arterial simulation tube 4 can be provided or not. If the arterial simulation tube 4 is provided, during use, the inlet end of the arterial simulation tube 4 can be connected to the outlet of the reservoir via a pulse pump, and the outlet end of the arterial simulation tube 4 can be connected to the return port of the reservoir. The pulse pump can be a cam pump.
[0033] In one feasible implementation, the phantom 1 includes a skin simulation layer 11, a skeleton simulation component 13, and a tissue simulation layer 12 located between the skin simulation layer 11 and the skeleton simulation component 13. The travel groove 14 is formed in the tissue simulation layer 12 to simulate limb structure and give the trainee the feeling of most closely similar to real puncture when operating the puncture needle.
[0034] Furthermore, the skin simulation layer 11 is made of platinum-catalyzed vulcanized silicone with a Shore A hardness between 10 and 15 degrees to simulate the softness and elasticity of real human skin; the tissue simulation layer 12 is made of foamed silicone or ultra-soft silicone (Shore A hardness 0-5 degrees) to simulate the softness and support of fat and connective tissue; the skeleton simulation part 13 is made of ABS engineering plastic and is 3D printed or injection molded, with an shape consistent with the outline of the human forearm skeleton.
[0035] Example 3 A method for adjusting vein depth is applied to the phantom 1 used for venipuncture, performing step S1 or step S2. S1: Translation; All linear motors 3 work synchronously, driving the vein simulation tube 2 to move as a whole along the width direction of the stroke groove 14 within the stroke groove 14, thus changing the overall depth of the vein simulation tube 2; S2: Rotational movement; The linear motor 3 hinged to the vein simulation tube 2 is not working, while the other linear motors 3 are working. The other linear motors 3 carry the vein simulation tube 2 and move it along the width direction of the travel groove 14. The vein simulation tube 2 rotates, and at the same time, the vein simulation tube 2 slides relative to the other linear motors 3, thereby driving the vein simulation tube 2 to move locally within the travel groove 14, and the local depth of the vein simulation tube 2 changes.
[0036] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.
Claims
1. A phantom for intravenous puncture, characterized in that: The mold (1) has a travel groove (14) inside; the travel groove (14) contains a vein simulation tube (2) and a drive assembly for driving the vein simulation tube (2) to slide in the travel groove (14); the direction in which the vein simulation tube (2) slides in the travel groove (14) has an angle with the radial direction of the mold (1).
2. The phantom body according to claim 1, characterized in that: The depth of the travel groove (14) is less than half the outer diameter of the vein simulation tube (2).
3. The phantom body according to claim 1, characterized in that: The drive assembly includes at least two linear motors (3), and multiple linear motors (3) are distributed along the vein simulation tube (2), with at least one linear motor (3) at each end of the vein simulation tube (2); the fixed end of the linear motor (3) is connected to the wall of the travel groove (14), and the movable end of the linear motor (3) is connected to the outer wall of the vein simulation tube (2).
4. The phantom according to claim 3, characterized in that: One of the linear motors (3) located at both ends of the vein simulation tube (2) is hinged to the vein simulation tube (2), and the other linear motors (3) are slidably connected to the vein simulation tube (2).
5. The phantom body according to claim 4, characterized in that: The output end of the linear motor (3) is hinged with a connecting ring (32), through which the vein simulation tube (2) passes; the connecting ring (32) on the linear motor (3) which is slidably connected to the vein simulation tube (2) is slidably connected to the vein simulation tube (2), and the connecting ring (32) on the linear motor (3) which is only hinged to the vein simulation tube (2) is fixedly connected to the vein simulation tube (2).
6. The phantom according to claim 5, characterized in that: An elastic damping pad (31) is provided between the connecting ring (32) and the vein simulation tube (2); the friction between the elastic damping pad (31) and the vein simulation tube (2) is greater than the friction between the vein simulation tube (2) and the model (1).
7. The phantom according to claim 3, characterized in that: The linear motors (3) located at both ends of the vein simulation tube (2) are fixedly connected to the vein simulation tube (2).
8. The phantom body according to claim 1, characterized in that: The phantom (1) also contains an artery simulation tube (4).
9. The phantom according to claim 1, characterized in that: The phantom (1) includes a skin simulation layer (11), a skeleton simulation component (13), and a tissue simulation layer (12) located between the skin simulation layer (11) and the skeleton simulation component (13), and the travel groove (14) is formed in the tissue simulation layer (12).
10. A method for adjusting vein depth, applied to the phantom for venipuncture as described in any one of claims 1-9, characterized in that: Proceed to step S1 or step S2; S1: Translation; All linear motors (3) work synchronously, driving the vein simulation tube (2) to move as a whole within the stroke groove (14), thus changing the overall depth of the vein simulation tube (2); S2: Rotational movement; The linear motor (3) hinged to the vein simulation tube (2) does not work, while the other linear motors (3) work. The other linear motors (3) move the vein simulation tube (2) with them, and the vein simulation tube (2) rotates. At the same time, the vein simulation tube (2) slides relative to the other linear motors (3), thereby driving the vein simulation tube (2) to move locally within the stroke groove (14), and the local depth of the vein simulation tube (2) changes.