机器人辅助视网膜下注射系统的设计与实现

王朝董; 广晨汉; 王丽强; 宗俊杰; 郑昱; 杨洋

doi:10.13700/j.bh.1001-5965.2021.0667

机器人辅助视网膜下注射系统的设计与实现

doi: 10.13700/j.bh.1001-5965.2021.0667

1.
北京航空航天大学机械工程及自动化学院，北京 100191
2.
解放军总医院眼科医学部，北京 100853

基金项目: 国家重点研发计划智能机器人专项(2007YFB1302700)

详细信息

通讯作者:
E-mail：yang_mech@buaa.edu.cn

中图分类号: TP242.3
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- 被引次数: 0
出版历程
- 收稿日期: 2021-11-05
- 录用日期: 2022-02-13
- 网络出版日期: 2022-03-25
- 整期出版日期: 2023-10-01

Design and implementation of robot-assisted subretinal injection system

1.
School of Mechanical Engineering and Automation，Beihang University，Beijing 100191，China
2.
Department of Ophthalmology，PLA General Hospital，Beijing 100853，China

Funds: National Key R&D Program for Intelligent Robots (2007YFB1302700)

More Information

Corresponding author: E-mail：yang_mech@buaa.edu.cn

摘要

摘要:
视网膜下注射人胚胎干细胞是治疗视网膜变性的一种有效术式，该术式对医生手术操作的精准性、稳定维持能力、安全性均提出了很高的要求。为此，提出一种基于主从式机器人的视网膜下注射系统，辅助医生完成视网膜下注射操作。构建从手机器人的正逆运动学模型，然后进行视网膜下注射手术运动分析，确定从手机器人的运动要求。建立主手和从手机器人之间的运动映射关系，依据运动映射关系推导建立远程运动中心（RCM）点位置调整运动、术中RCM运动的状态切换和分离过程的速度映射模型。通过离体猪眼球视网膜下穿刺注射实验对机器人的精确性和稳定维持能力进行验证，结果表明：机器人辅助操作系统末端注射针具有稳定维持能力和运动的精确性，机器人辅助操作比徒手操作对视网膜造成的创伤更小，注射更稳定。
- 机器人辅助视网膜手术 /
- 主从控制 /
- 远程运动中心 /
- 眼内手术 /
- 显微手术
Abstract:
Subretinal injection of human embryonic stem cells is an effective procedure for treating retinal degeneration, which imposes high demands on the precision, stability, and safety of the surgical procedure. To address these challenges, a robot-assisted retinal surgery system based on a master-slave control approach is proposed. The system utilizes a master robot to control a slave robot during the subretinal injection operation. By constructing the direct and inverse kinematic models of the slave robot, the precise motion requirements for the subretinal injection are determined. Additionally, the system incorporates the concept of the remote center of motion (RCM) to adjust the position of the surgical instruments during remote motion. A velocity mapping model is derived to facilitate the adjustment of the RCM point, state transitions, and separation process during the procedure.The validation of the system’s accuracy and stability is conducted through ex vivo porcine eyeball subretinal puncture injection experiments, simulating the conditions of intraocular surgery. The results demonstrate that the robot-assisted system exhibits stable needle maintenance and precise motion, indicating its superiority over manual procedures in terms of reducing trauma to the retina and achieving more stable injections. This technology represents a advancement in microsurgery techniques, enhancing the precision and safety of subretinal injection procedures for the treatment of retinal degeneration.
- robot-assisted retinal surgery /
- master-slave control /
- remote center of motion /
- intraocular surgery /
- Microsurgery

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图 1 机器人系统组成

Figure 1. Composition of robot system

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图 2 RCM机构运动简图和实物图

Figure 2. Schematic diagram and physical diagram of RCM

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图 3 微流注射系统示意

Figure 3. Schematic diagram of microfluidic injection system

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图 4 注射针

Figure 4. Injection needle

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图 5 机器人坐标系

Figure 5. Robot coordinate system

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图 6 末端工作空间向视图

Figure 6. End workspace direction view

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图 7 末端工作空间y-z投影

Figure 7. y-z projection of end workspace

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图 8 末端工作空间x-y投影

Figure 8. x-y projection of end workspace

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图 9 末端工作空间x-z投影

Figure 9. x-z projection of end workspace

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图 10 RCM机构简图

Figure 10. Sketch map of RCM mechanism

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图 11 手术关键阶段示意图

Figure 11. Schematic diagram of key stages of surgery

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图 12 RCM运动示意图

Figure 12. Schematic representation of RCM movement

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图 13 机器人系统及手术阶段

Figure 13. Robotic system and surgical stages

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图 14 主手摇杆轴偏移角度与从手末端速度关系

Figure 14. Relationship between axis offset angle of master joystick and speed of slave end

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图 15 机器人主从映射关系

Figure 15. Master-slave mapping relationship of robot

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图 16 手术场景图

Figure 16. Operation scene diagram

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图 17 注射结束前后的图像

Figure 17. Images before and after injection

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表 1 机器人性能指标

Table 1. Robot performance index

参数	数值
RCM点xyz运动范围/mm	±50
RCM点xyz运动精度/mm	0.01
俯仰运动范围/（°）	±30
翻滚运动范围/（°）	±90
俯仰/翻滚运动精度/rad	0.000 5
注射针自身轴向的旋转范围/（°）	±180
注射针自身轴向的旋转精度/（°）	＜ 1

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表 2 D-H参数表

Table 2. D-H parameter table

i	z_i-1到z_i沿x_i-1 距离a_i-1	z_i-1到z_i绕x_i-1 角度α_i-1/（°）	x_i-1到x_i沿z_i 距离d_i	x_i-1到x_i绕z_i 角度θ_i
1	0	0	d₁	θ₁
2	a₁	0	d₂	θ₂
3	a₂	0	d₃	−90°
4	0	−90	d₄	−90°+θ₃
5	0	−90	0	θ₄
6	0	−90	d₆	0

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表 3 实验结果

Table 3. Experimental result

操作方式及编号	玻璃体腔漏液	视网膜创伤孔大小	眼球完整性
徒手操作1	+++	+++	完整
徒手操作2	+++	++	完整
徒手操作3	+	++	完整
徒手操作4	+++	+++	完整
徒手操作5	+	++++	完整
机器人辅助6	+	+	完整
机器人辅助7	++	++	完整
机器人辅助8	+	+	完整
机器人辅助9	+	+	完整
机器人辅助10	+	+	完整

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