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EP-4563100-B1 - COOLABLE ABRASIVE DRILL FOR MINIMALLY INVASIVE SPINE SURGERY

EP4563100B1EP 4563100 B1EP4563100 B1EP 4563100B1EP-4563100-B1

Inventors

  • HE, CHENGDONG
  • YUE, Xin
  • DONG, Qingpeng

Dates

Publication Date
20260506
Application Date
20230920

Claims (8)

  1. A grinding drill with a cooling function for a minimally invasive spinal surgery, comprising a grinder fixture (1), a grinding rod assembly (2), and a grinder (3), wherein the grinder fixture (1) comprises a housing assembly (11) and a sleeve (12) that is detachably connected inside the housing assembly (11); one end of the grinding rod assembly (2) extends into the housing assembly (11) and is connected to the sleeve (12) through a connecting shaft (13); an inner grinding rod (4) is rotatably provided in the grinding rod assembly (2); the grinder (3) runs through the other end of the grinding rod assembly (2) and is connected to the inner grinding rod (4); an end of the inner grinding rod (4) away from the grinder (3) extends into the sleeve (12) and is rotatably connected to the sleeve (12) through a transmission element (5); and the transmission element (5) is connected to an external power handle through an interface (14) of the sleeve (12); and a spiral cooling passage (16) communicated with a water injection hole (15) of the sleeve (12) is provided between an inner wall of the housing assembly (11) and an outer wall of the sleeve (12); the grinding rod assembly (2) is provided with a water inlet (21); and the water inlet (21) is communicated with the cooling passage (16) through a chamber (17) inside the housing assembly (11); wherein the grinding rod assembly (2) comprises a fourth outer tube (22), a third outer tube (23), a second outer tube (24) and a first outer tube (25) that are arranged sequentially from inside to outside; and the fourth outer tube (22), the third outer tube (23), the second outer tube (24) and the first outer tube (25) are sequentially communicated from outside to inside to form a cooling water passage for cooling the grinder (3) and the inner grinding rod (4); wherein a cavity is formed between each two adjacent outer tubes; the water inlet (21) is located on an outer wall of an end of the first outer tube (25) adjacent to the connecting shaft (13); a side wall of the second outer tube (24) is provided with a water guide passage (241) that is communicated with the cavity between the first outer tube (25) and the second outer tube (24); the third outer tube (23) is provided with a water guide hole (231) that is communicated with the cavity between the second outer tube (24) and the third outer tube (23); and an end of each of the fourth outer tube (22) and the third outer tube (23) adjacent to the grinder (3) is provided with a water outlet (26) that is communicated with the cavity.
  2. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 1, characterized in that the housing assembly (11) comprises a fastening element (111) and a water-cooled housing (112) that is detachably connected to the fastening element (111); the fourth outer tube (22), the third outer tube (23), the second outer tube (24), and the first outer tube (25) all extend into the fastening element (111) and are connected to the connecting shaft (13) through the first outer tube (25); the chamber (17) is a gap between the fastening element (111) and the connecting shaft (13); and the cooling passage (16) is located between an inner wall of the water-cooled housing (112) and the outer wall of the sleeve (12).
  3. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 2, characterized in that an end of the water-cooled housing (112) away from the fastening element (111) is clamped to a locking element (113) configured to lock the external power handle.
  4. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 1, characterized in that an outer wall of the inner grinding rod (4) is wrapped by an anti-friction tube (6); and the fourth outer tube (22) is located outside the anti-friction tube (6).
  5. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 2, characterized in that a gap is formed between the fourth outer tube (22) and the grinder (3).
  6. The grinding drill with the cooling function for the minimally invasive spinal surgery according to any one of claims 1 to 5, characterized in that the grinder (3) is connected to the inner grinding rod (4) through a steel tube (31); and an end of the grinder (3) away from the inner grinding rod (4) forms an emery spherical grinding head, conical grinding head, or grinding head with a cutting edge.
  7. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 6, characterized in that the transmission element (5) comprises a bearing (51) provided inside the sleeve (12) and a coupling (52) in a rotational fit with the bearing (51); the coupling (52) is connected to the inner grinding rod (4); and the coupling (52) is connected to the external power handle through the interface (14).
  8. The grinding drill with the cooling function for the minimally invasive spinal surgery according to claim 6, characterized in that a sealing ring (131) is provided between the connecting shaft (13) and the sleeve (12).

Description

TECHNICAL FIELD The utility model relates to the technical field of medical appliances, and in particular to a grinding drill with a cooling function for a minimally invasive spinal surgery. BACKGROUND TECHNOLOGY The description of the background in the present application applies to related art of the present application, and is merely intended to illustrate the content of and facilitate understanding of the present application. It should not be deemed that the applicant clearly regards or is presumed to regard the description as belonging to the prior art of the present application on the filing date of the first application. During spine grinding operations in surgical procedures, traditional manual grinders have problems such as low efficiency, inconvenience in observing the surgical site, and difficulty in controlling the force. As a result, it is difficult to remove a spine with low toughness around the surgical site, and it is easy to cause damage to a soft tissue with high toughness around, especially that adjacent to the spine, thereby affecting the recovery of the surgical site. Traditional scrappers and grinding drills cannot meet the requirements of fine surgeries such as spine drilling due to their sizes. In addition, during high-speed rotation, external physiological saline needs to be introduced to cope with the heating problem of the grinding rod. The multi-instrument application has strict requirements for the surgical space due to the complexity of the spine area. However, the existing power system scrappers and grinding drills increase the surgical risk. For example, Chinese patent application CN211243576U discloses a grinding drill for a neurosurgery surgery. Mainly, a hollow tube is provided outside a grinding rod to introduce physiological saline for cooling. When in use, the external physiological saline needs to be continuously introduced. However, due to the limited surgical space of the spine, failure to timely extract the discharged physiological saline will seriously affect the surgical field of vision. Therefore, the existing power system scrappers and grinding drills are not suitable for drilling the spine. CN215018430U discloses an eccentric sheath grinding head with spiral cooling water channel and coaxial multi-tube structure. At present, instrument cooling is still an urgent problem to be solved for spinal surgeries, especially those involving tissue scrapping and grinding. CONTENT OF THE UTILITY MODEL An objective of the utility model is to provide a grinding drill with a cooling function for a minimally invasive spinal surgery. The utility model solves the problems that the existing grinders for minimally invasive surgeries require a large amount of coolant and cannot effectively cool the grinding rod. To solve the technical problems, the utility model adopts the following technical solution. A grinding drill with a cooling function for a minimally invasive spinal surgery includes a grinder fixture, a grinding rod assembly, and a grinder, where the grinder fixture includes a housing assembly and a sleeve that is detachably connected inside the housing assembly; one end of the grinding rod assembly extends into the housing assembly and is connected to the sleeve through a connecting shaft; an inner grinding rod is rotatably provided in the grinding rod assembly; the grinder runs through the other end of the grinding rod assembly and is connected to the inner grinding rod; an end of the inner grinding rod away from the grinder extends into the sleeve and is rotatably connected to the sleeve through a transmission element; and the transmission element is connected to an external power handle through an interface of the sleeve; and a spiral cooling passage communicated with a water injection hole of the sleeve is provided between an inner wall of the housing assembly and an outer wall of the sleeve; the grinding rod assembly is provided with a water inlet; and the water inlet is communicated with the cooling passage through a chamber inside the housing assembly. In the utility model, the transmission element is connected to the external power handle through the interface, and the external power handle drives the inner grinding rod and the grinder to rotate and drill the spine. The external power handle is provided with an inlet pipe. When the external power handle is inserted into the interface and connected to the transmission element, the inlet pipe of the external power handle is communicated with the water injection hole of the sleeve, and the cooling water is introduced into the cooling passage and the chamber through the water injection hole. The cooling water enters the grinding rod assembly through the water inlet and cools the grinding rod assembly and the inner grinding rod. The cooling water finally flows through the grinder from the grinding rod assembly to cool the grinder, thereby reducing thermal damage to the tissue during the grinding process. The grinding ro