Patent ID: 11938041
Assignee: SHANGHAI SANYOU MEDICAL CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A | IPC A

Claim 6:
7. A passage establishment system for posterior spinal fusion minimally invasive surgery, comprising:
a guide pin (100);
an intermediate expansion kit (200), wherein the intermediate expansion kit (200) can be sleeved on an outside of the guide pin (100), wherein the intermediate expansion kit (200) is in clearance fit with the guide pin (100),
wherein an expansion portion notch (201) is formed on an outer surface of a front end of the intermediate expansion kit (200);

an outer sleeve (300), wherein the outer sleeve (300) can be sleeved on an outside of the intermediate expansion kit (200), wherein the outer sleeve (300) is in clearance fit with the intermediate expansion kit (200),
wherein an outer sleeve notch (310) is formed on an outer surface of a front part of the outer sleeve (300), wherein the outer sleeve notch (310) communicates with the inside of the outer sleeve (300),
wherein when a front end of the outer sleeve (300) is coplanar with the front end of the intermediate expansion kit (200), the outer sleeve notch (310) and the expansion portion notch (201) form a spreading portion notch;

a guide bar (500), wherein the guide bar (500) can be inserted into the outer sleeve (300), wherein the guide bar (500) is in clearance fit with the outer sleeve (300); and
a passage establishment device for posterior spinal fusion minimally invasive surgery, wherein a front end of the passage establishment device extends into a spine, wherein the device comprises:
a tube (600), wherein an interior of the tube (600) includes a through hole (601) penetrating both axial ends of the tube (600), and a wall of the tube (600) includes an opening portion (610),
wherein the internal structure of the tube (600) is the same as the structure of the guide bar (500), the tube (600) can be sleeved on the guide bar (500), and the guide bar (500) is in clearance fit with the tube (600).